Humour | Defition and theory humour

Humour or humor (see spelling differences) is the tendency of particular cognitive experiences to provoke laughter and provide amusement. The term derives from the humoral medicine of the ancient Greeks, which taught that the balance of fluids in the human body, known as humors (Latin: humor, "body fluid"), control human health and emotion.

People of all ages and cultures respond to humour. The majority of people are able to experience humour, i.e., to be amused, to laugh or smile at something funny, and thus they are considered to have a sense of humour. The hypothetical person lacking a sense of humour would likely find the behaviour induced by humour to be inexplicable, strange, or even irrational. Though ultimately decided by personal taste, the extent to which an individual will find something humorous depends upon a host of variables, including geographical location, culture, maturity, level of education, intelligence and context. For example, young children may favour slapstick, such as Punch and Judy puppet shows or cartoons such as Tom and Jerry. Satire may rely more on understanding the target of the humour and thus tends to appeal to more mature audiences. Nonsatirical humour can be specifically termed "recreational drollery".

Many theories exist about what humour is and what social function it serves. The prevailing types of theories attempting to account for the existence of humour include psychological theories, the vast majority of which consider humour-induced behaviour to be very healthy; spiritual theories, which may, for instance, consider humour to be a "gift from God"; and theories which consider humour to be an unexplainable mystery, very much like a mystical experience.

Some claim that humour cannot or should not be explained. Author E.B. White once said, "Humor can be dissected as a frog can, but the thing dies in the process and the innards are discouraging to any but the pure scientific mind."

Arthur Schopenhauer lamented the misuse of the term "humour" (a German loanword from English) to mean any type of comedy. However, both "humour" and "comic" are often used when theorising about the subject. The connotations of "humour" as opposed to "comic" are said to be that of response versus stimulus. Additionally, "humour" was thought to include a combination of ridiculousness and wit in an individual; the paradigmatic case being Shakespeare's Sir John Falstaff. The French were slow to adopt the term "humour"; in French, "humeur" and "humour" are still two different words, the former referring to a person's mood or to the archaic concept of the four humours.

The Incongruity Theory originated mostly with Kant, who claimed that the comic is an expectation that comes to nothing. Henri Bergson attempted to perfect incongruity by reducing it to the "living" and "mechanical".

An incongruity like Bergson's, in things juxtaposed simultaneously, is still in vogue. This is often debated against theories of the shifts in perspectives in humour; hence, the debate in the series Humor Research between John Morreall and Robert Latta. Morreall presented mostly simultaneous juxtapositions, with Latta countering that it requires a "cognitive shift" created by a discovery or solution to a puzzle or problem. Latta is criticised for having reduced jokes' essence to their own puzzling aspect.

Humour frequently contains an unexpected, often sudden, shift in perspective, which gets assimilated by the Incongruity Theory. This view has been defended by Latta (1998) and by Brian Boyd (2004). Boyd views the shift as from seriousness to play. Nearly anything can be the object of this perspective twist; it is, however, in the areas of human creativity (science and art being the varieties) that the shift results from "structure mapping" (termed "bisociation" by Koestler) to create novel meanings. Arthur Koestler argues that humour results when two different frames of reference are set up and a collision is engineered between them.

As with any form of art, acceptance depends on social demographics and varies from person to person. Throughout history, comedy has been used as a form of entertainment all over the world, whether in the courts of the Western kings or the villages of the Far East. Both a social etiquette and a certain intelligence can be displayed through forms of wit and sarcasm. Eighteenth-century German author Georg Lichtenberg said that "the more you know humour, the more you become demanding in fineness."

Alastair Clarke explains: "The theory is an evolutionary and cognitive explanation of how and why any individual finds anything funny. Effectively, it explains that humour occurs when the brain recognises a pattern that surprises it, and that recognition of this sort is rewarded with the experience of the humorous response, an element of which is broadcast as laughter." The theory further identifies the importance of pattern recognition in human evolution: "An ability to recognise patterns instantly and unconsciously has proved a fundamental weapon in the cognitive arsenal of human beings. The humorous reward has encouraged the development of such faculties, leading to the unique perceptual and intellectual abilities of our species."

Osteoarthritis Understanding and definition of the Osteoarthritis

Osteoarthritis (OA) also known as degenerative arthritis or degenerative joint disease, is a group of mechanical abnormalities involving degradation of joints, including articular cartilage and subchondral bone. Symptoms may include joint pain, tenderness, stiffness, locking, and sometimes an effusion. A variety of causes—hereditary, developmental, metabolic, and mechanical—may initiate processes leading to loss of cartilage. When bone surfaces become less well protected by cartilage, bone may be exposed and damaged. As a result of decreased movement secondary to pain, regional muscles may atrophy, and ligaments may become more lax.

Treatment generally involves a combination of exercise, lifestyle modification, and analgesics. If pain becomes debilitating, joint replacement surgery may be used to improve the quality of life. OA is the most common form of arthritis, and the leading cause of chronic disability in the United States. It affects about 8 million people in the United Kingdom and nearly 27 million people in the United States.

Osteoarthritis can be classified into either primary or secondary depending on whether or not there is an identifiable underlying cause.

The main symptom is pain, causing loss of ability and often stiffness. "Pain" is generally described as a sharp ache, or a burning sensation in the associate muscles and tendons. OA can cause a crackling noise (called "crepitus") when the affected joint is moved or touched, and patients may experience muscle spasm and contractions in the tendons. Occasionally, the joints may also be filled with fluid. Humid and cold weather increases the pain in many patients.

OA commonly affects the hands, feet, spine, and the large weight bearing joints, such as the hips and knees, although in theory, any joint in the body can be affected. As OA progresses, the affected joints appear larger, are stiff and painful, and usually feel better with gentle use but worse with excessive or prolonged use, thus distinguishing it from rheumatoid arthritis.

In smaller joints, such as at the fingers, hard bony enlargements, called Heberden's nodes (on the distal interphalangeal joints) and/or Bouchard's nodes (on the proximal interphalangeal joints), may form, and though they are not necessarily painful, they do limit the movement of the fingers significantly. OA at the toes leads to the formation of bunions, rendering them red or swollen. Some people notice these physical changes before they experience any pain.

OA is the most common cause of joint effusion, sometimes called water on the knee in lay terms, an accumulation of excess fluid in or around the knee joint.

Exercise, including running in the absence of injury, has not been found to increase one's risk of developing osteoarthritis. Cracking ones knuckles also does not appear to play a role. Some investigators believe that mechanical stress on joints underlies all osteoarthritis, with many and varied sources of mechanical stress, including misalignments of bones caused by congenital or pathogenic causes; mechanical injury; overweight; loss of strength in muscles supporting joints; and impairment of peripheral nerves, leading to sudden or uncoordinated movements that overstress joints.

Primary osteoarthritis is a chronic degenerative disorder related to but not caused by aging, as there are people well into their nineties who have no clinical or functional signs of the disease. As a person ages, the water content of the cartilage decreases as a result of a reduced proteoglycan content, thus causing the cartilage to be less resilient. Without the protective effects of the proteoglycans, the collagen fibers of the cartilage can become susceptible to degradation and thus exacerbate the degeneration. Inflammation of the surrounding joint capsule can also occur, though often mild (compared to that which occurs in rheumatoid arthritis). This can happen as breakdown products from the cartilage are released into the synovial space, and the cells lining the joint attempt to remove them. New bone outgrowths, called "spurs" or osteophytes, can form on the margins of the joints, possibly in an attempt to improve the congruence of the articular cartilage surfaces. These bone changes, together with the inflammation, can be both painful and debilitating.

A number of studies have shown that there is a greater prevalence of the disease among siblings and especially identical twins, indicating a hereditary basis. Up to 60% of OA cases are thought to result from genetic factors.

Both primary generalized nodal OA and erosive OA (EOA. also called inflammatory OA) are sub-sets of primary OA. EOA is a much less common, and more aggressive inflammatory form of OA which often affects the DIPs and has characteristic changes on X-Ray.

Diagnosis is made with reasonable certainty based on history and clinical examination. X-rays may confirm the diagnosis. The typical changes seen on X-ray include: joint space narrowing, subchondral sclerosis (increased bony formation around the joint), subchondral cyst formation, and osteophytes. Plain films may not correlate with the findings on physical examination or with the degree of pain. Usually other imaging techniques are not necessary to clinically diagnose osteoarthritis.

In 1990, the American College of Rheumatology, using data from a multi-center study, developed a set of criteria for the diagnosis of hand osteoarthritis based on hard tissue enlargement and swelling of certain joints. These criteria were found to be 92% sensitive and 98% specific for hand osteoarthritis versus other entities such as rheumatoid arthritis and spondyloarthropathies.

Related pathologies whose names may be confused with osteoarthritis include pseudo-arthrosis. This is derived from the Greek words pseudo, meaning "false", and arthrosis, meaning "joint." Radiographic diagnosis results in diagnosis of a fracture within a joint, which is not to be confused with osteoarthritis which is a degenerative pathology affecting a high incidence of distal phalangeal joints of female patients.

Lifestyle modification (such as weight loss and exercise) and analgesics are the mainstay of treatment. Acetaminophen / paracetamol is used first line and NSAIDS are only recommended as add on therapy if pain relief is not sufficient. This is due to the relative greater safety of acetaminophen.

Physical therapy has been shown to significantly improve function, decrease pain, and delay need for surgical intervention in advanced cases. Exercise prescribed by a physical therapist has been shown to be more effective than medications in treating osteoarthritis of the knee. Functional, gait, and balance training has been recommended to address impairments of proprioception, balance, and strength in individuals with lower extremity arthritis as these can contribute to higher falls in older individuals. Splinting of the thumb for OA of the base of the thumb leads to improvements after one year.

Sarcoidosis | Understanding and definition of the Sarcoidosis

Sarcoidosis also called sarcoid, Besnier-Boeck disease or Besnier-Boeck-Schaumann disease, is a disease in which abnormal collections of chronic inflammatory cells (granulomas) form as nodules in multiple organs. The cause of sarcoidosis is unknown. Granulomas most often appear in the lungs or the lymph nodes, but virtually any organ can be affected. Normally the onset is gradual. Sarcoidosis may be asymptomatic or chronic. It commonly improves or clears up spontaneously. More than 2/3 of people with lung sarcoidosis have no symptoms after 9 years. About 50% have relapses. About 10% develop serious disability. Lung scarring or infection may lead to respiratory failure and death.

Sarcoidosis is a systemic disease that can affect any organ. Common symptoms are vague, such as fatigue unchanged by sleep, lack of energy, weight loss, aches and pains, arthritis, dry eyes, swelling of the knees, blurry vision, shortness of breath, a dry hacking cough or skin lesions. Sarcoidosis and cancer may mimic one another, making the distinction difficult. The cutaneous symptoms vary, and range from rashes and noduli (small bumps) to erythema nodosum or lupus pernio. It is often asymptomatic.

The combination of erythema nodosum, bilateral hilar lymphadenopathy and arthralgia is called Löfgren syndrome. This syndrome has a relatively good prognosis.

Renal, liver (including portal hypertension), heart or brain involvement may cause further symptoms and altered functioning. Sarcoidosis affecting the brain or nerves is known as neurosarcoidosis.

Although cardiac involvement is present in 20% to 30% of patients with sarcoidosis, only about 5% of patients with systemic sarcoidosis are symptomatic.

The presentation of cardiac sarcoidosis can range from asymptomatic conduction abnormalities to fatal ventricular arrhythmia. Myocardial sarcoidosis can be a rare cause of sudden cardiac death.

Manifestations in the eye include uveitis, uveoparotitis, and retinal inflammation, which may result in loss of visual acuity or blindness. The combination of anterior uveitis, parotitis, VII cranial nerve paralysis and fever is called uveoparotid fever, and is associated with Heerfordt-Waldenstrom syndrome.

The central nervous system is involved in fewer than 1% of patients with sarcoidosis. There is usually granulomatous involvement of the basal meninges that subsequently affects the cranial nerves. Myelopathy may be the initial clinical presentation of intramedullary neurosarcoidosis.

Diagnosis of sarcoidosis is often a matter of exclusion. To exclude sarcoidosis in a case presenting with pulmonary symptoms might involve chest X-ray, CT scan of chest, PET scan, CT-guided biopsy, mediastinoscopy, open lung biopsy, bronchoscopy with biopsy, endobronchial ultrasound and endoscopic ultrasound with FNA of mediastinal lymph nodes(EBUS FNA). Tissue from biopsy of lymph nodes is subjected to both flow cytometry to rule out cancer and special stains (acid fast bacilli stain and Gömöri methenamine silver stain) to rule out microorganisms and fungi. Angiotensin-converting enzyme blood levels are used in diagnosis and monitoring of sarcoidosis.

Differential diagnosis includes metastatic disease, lymphoma, septic emboli, rheumatoid nodules, Wegener's granulomatosis, varicella infection, and atypical infections such as mycobacterium avium complex, cytomegalovirus, and cryptococcus.

Because of the wide range of possible manifestations the investigations to confirm diagnosis may involve many organs and methods depending on initial presentation.

Very often, Sarcoidosis presents as a restrictive disease of the lungs, causing a decrease in lung volume and decreased compliance (the ability to stretch) - hence chest X-ray and other methods are used to assess the severity or rule out pulmonary disease.

The disease typically limits the amount of air drawn into the lungs, but produces higher than normal expiratory flow ratios. The vital capacity (full breath in, to full breath out) is decreased, and most of this air can be blown out in the first second. This means the FEV1/FVC ratio is increased from the normal of about 80%, to 90%. Obstructive lung changes, causing a decrease in the amount of air that can be exhaled, may occur when enlarged lymph nodes in the chest compress airways or when internal inflammation or nodules impede airflow.

Chest X-ray changes are divided into four stages

1. Stage 1 bihilar lymphadenopathy
2. Stage 2 bihilar lymphadenopathy and reticulonodular infiltrates
3. Stage 3 bilateral pulmonary infiltrates
4. Stage 4 fibrocystic sarcoidosis typically with upward hilar retraction, cystic & bullous changes

Investigations to assess involvement of other organs frequently involve electrocardiogram, ocular examination by an ophthalmologist, liver function tests, renal function tests, serum calcium and 24-hour urine calcium.

In female patients, sarcoidosis is significantly associated with hypothyroidism, hyperthyroidism and other thyroid diseases, hence close surveillance of thyroid function is recommended.

The exact cause of sarcoidosis is not known. The current working hypothesis is that in genetically susceptible individuals sarcoidosis is caused through alteration in immune response after exposure to an environmental, occupational, or infectious agent.

Granulomatous inflammation is characterized primarily by accumulation of monocytes, macrophages and activated T-lymphocytes, with increased production of key inflammatory mediators, TNF-alpha, IFN-gamma, IL-2 and IL-12, characteristic of a Th1-polarized response (T-helper lymphocyte-1 response). Sarcoidosis has paradoxical effects on inflammatory processes; it is characterized by increased macrophage and CD4 helper T-cell activation resulting in accelerated inflammation, however, immune response to antigen challenges such as tuberculin is suppressed. This paradoxic state of simultaneous hyper- and hypo- activity is suggestive of a state of anergy. The anergy may also be responsible for the increased risk of infections and cancer. It appears that regulatory T-lymphocytes in the periphery of sarcoid granulomas suppress IL-2 secretion which is hypothesized to cause the state of anergy by preventing antigen-specific memory responses.

While it is widely believed that TNF-alpha plays an important role in the formation of granulomas, it was observed that sarcoidosis can be triggered by treatment with the TNF-alpha antagonist etanercept.

Investigations of genetic susceptibility yielded many candidate genes but only few were confirmed by further investigations and no reliable genetic markers are known. Currently, the most interesting candidate gene is BTNL2; several HLA-DR risk alleles are also being investigated. In persistent sarcoidosis the HLA haplotype HLA-B7-DR15 are either cooperating in disease or another gene between these two loci is associated. In non-persistent disease there is a strong genetic association with HLA DR3-DQ2. Siblings have only a modestly increased risk (hazard ratio 5-6) of developing the disease, indicating that genetic susceptibility plays only a small role. The alternate hypothesis that family members share similar exposures to environmental pathogens is quite plausible to explain the apparent hereditary factor.

Several infectious agents appear to be significantly associated with sarcoidosis but none of the known associations is specific enough to suggest a direct causative role. Propionibacterium acnes can be found in bronchoalveolar lavage of approximately 70% patients and is associated with disease activity, however it can be also found in 23% of controls. A recent meta-analysis investigating the role of mycobacteria in sarcoidosis found it was present in 26.4% of cases, however the meta-analysis also detected a possible publication bias, so the results need further confirmation.

There have also been reports of transmission of sarcoidosis via organ transplants.

Sarcoidosis frequently causes an increase in vitamin D production outside the kidney. Macrophages inside the granulomas convert vitamin D to its active form, resulting in elevated levels of the hormone 1,25-dihydroxyvitamin D and symptoms of hypervitaminosis D that may include fatigue, lack of strength or energy, irritability, metallic taste, temporary memory loss or cognitive problems. Physiological compensatory responses (e.g., suppression of the parathyroid hormone levels) may mean the patient does not develop frank hypercalcemia. This condition may be aggravated by high levels of estradiol and prolactin such as in pregnancy, leading to hypercalciuria and/or compensatory hypoparathyroidism. High levels of Vitamin D are also implicated in immune-system dysfunctions which tie into the sarcoid condition.

Prolactin is frequently increased in sarcoidosis, between 3–32% cases have hyperprolactinemia, this frequently leads to amenorrhea, galactorrhea or nonpuerperal mastitis in women. Prolactin also has a broad spectrum of effects on the immune system and increased prolactin levels are associated with disease activity or may exacerbate symptoms in many autoimmune diseases and treatment with prolactin lowering medication has been shown effective in some cases. However it is unknown if this relation holds in sarcoidosis and the gender predilection in sarcoidosis is less pronounced than in some other autoimmune diseases where such relation has been established. In pregnancy, the effects of prolactin and estrogen counteract each other to some degree, with a slight trend to improve pulmonary manifestations of sarcoidosis while lupus, uveitis and arthralgia might slightly worsen. Lupus, uveitis and arthralgia are known to be in some cases associated with increased prolactin levels and respond to bromocriptin treatment but so far this has not been investigated specifically for sarcoidosis. The reasons for increased prolactin levels in sarcoidosis are uncertain. It has been observed that prolactin is produced by T-lymphocytes in some autoimmune disorders in amounts high enough to affect the feedback by the hypothalamic dopaminergic system.

The extrapituitary prolactin is believed to play a role as a cytokine like proinflammatory factor. Prolactin antibodies are believed to play a role in hyperprolactinemia in other autoimmune disorders and high prevalence endocrine autoimmunity has been observed in patients with sarcoidosis. It may also be a consequence of renal disease or treatment with steroids. Neurosarcoidosis may occasionally cause hypopituiarism but has not been reported to cause hyperprolactinemia.

In women, a substantial association of thyroid disease and sarcoidosis has been reported. The association is less marked but still significant for male patients. Female patients have a significantly elevated risk for hypothyroidism, hyperthyroidism and thyroid autoimmunity and it appears that autoimmunity is very important in the pathogenesis of thyroid disease in this population. Thyroid granulomatosis on the other hand is uncommon.

Association of autoimmune disorders has been frequently observed. The exact mechanism of this relation is not known but some evidence supports the hypothesis that this is a consequence of Th1 lymphokine prevalence.

Sarcoidosis has been associated with celiac disease. Celiac disease is a condition in which there is a chronic reaction to certain protein chains, commonly referred to as glutens, found in some cereal grains. This reaction causes destruction of the villi in the small intestine, with resulting malabsorption of nutrients.

An association with type IV hypersensitivity has been described. Tests of delayed cutaneous hypersensitivity have been used to measure progression.

Between 30 and 70% of patients do not require therapy. Corticosteroids, most commonly prednisolone, have been the standard treatment for many years. In some patients, this treatment can slow or reverse the course of the disease, but other patients do not respond to steroid therapy. The use of corticosteroids in mild disease is controversial because in many cases the disease remits spontaneously. Additionally, corticosteroids have many recognized dose- and duration-related side effects, and their use is generally limited to severe, progressive, or organ-threatening disease. The influence of corticosteroids or other immunosuppressants on the natural history is unclear.

Severe symptoms are generally treated with steroids, and steroid-sparing agents such as azathioprine and methotrexate are often used. Rarely, cyclophosphamide has also been used. As the granulomas are caused by collections of immune system cells, particularly T cells, there has been some early indications of success using immunosuppressants, interleukin-2 inhibitors or anti-tumor necrosis factor-alpha treatment (such as infliximab). Unfortunately, none of these has provided reliable treatment, and there can be significant side effects such as an increased risk of reactivating latent tuberculosis. Anti-tumor necrosis factor-alpha treatment with etanercept in rheumatoid arthritis has been observed to cause sarcoidosis.

Because sarcoidosis can affect multiple organ systems, follow-up on a patient with sarcoidosis should always include an electrocardiogram, ocular examination by an ophthalmologist, liver function tests, serum calcium and 24-hour urine calcium. In female patients sarcoidosis is significantly associated with hypothyroidism, hyperthyroidism and other thyroid diseases, hence close surveillance of thyroid function is recommended.

The disease can remit spontaneously or become chronic, with exacerbations and remissions. In some patients, it can progress to pulmonary fibrosis and death. Approximately half of the cases resolve without treatment or can be cured within 12–36 months and most within 5 years. Some cases persist several decades. Where the heart is involved, the prognosis is poor. Patients with sarcoidosis appear to be at significantly increased risk for cancer, in particular lung cancer, malignant lymphomas, and cancer in other organs known to be affected in sarcoidosis. In sarcoidosis-lymphoma syndrome, sarcoidosis is followed by the development of a lymphoproliferative disorder such as non-Hodgkin lymphoma. This may be attributed to the underlying immunological abnormalities that occur during the sarcoidosis disease process. Sarcoidosis can also follow cancer or occur concurrently with cancer. There have been reports of hairy cell leukemia, acute myeloid leukemia, and acute myeloblastic leukemia associated with sarcoidosis.

Technetium | History and definition of the Technetium | technetium 99m | technetium element

Technetium is the chemical element with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes; every form of it is radioactive. Nearly all technetium is produced synthetically and only minute amounts are found in nature. Naturally occurring technetium occurs as a spontaneous fission product in uranium ore or by neutron capture in molybdenum ores. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese.

Many of technetium's properties were predicted by Dmitri Mendeleev before the element was discovered. Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937 technetium (specifically the technetium-97 isotope) became the first predominantly artificial element to be produced, hence its name (from the Greek τεχνητός, meaning "artificial").

Its short-lived gamma ray-emitting nuclear isomer—technetium-99m—is used in nuclear medicine for a wide variety of diagnostic tests. Technetium-99 is used as a gamma ray-free source of beta particles. Long-lived technetium isotopes produced commercially are by-products of fission of uranium-235 in nuclear reactors and are extracted from nuclear fuel rods. Because no isotope of technetium has a half-life longer than 4.2 million years (technetium-98), its detection in red giants in 1952, which are billions of years old, helped bolster the theory that stars can produce heavier elements.

From the 1860s through 1871, early forms of the periodic table proposed by Dimitri Mendeleev contained a gap between molybdenum (element 42) and ruthenium (element 44). In 1871, Mendeleev predicted this missing element would occupy the empty place below manganese and therefore have similar chemical properties. Mendeleev gave it the provisional name ekamanganese (eka- from the Sanskrit words for one), because the predicted element was one place down from the known element manganese.

Many early researchers, both before and after the periodic table was published, were eager to be the first to discover and name the missing element; its location in the table suggested that it should be easier to find than other undiscovered elements. It was first thought to have been found in platinum ores in 1828 and was given the name polinium, but turned out to be impure iridium. Then, in 1846, the element ilmenium was claimed to have been discovered, but later was determined to be impure niobium. This mistake was repeated in 1847 with the "discovery" of pelopium.

In 1877, the Russian chemist Serge Kern reported discovering the missing element in platinum ore. Kern named what he thought was the new element davyum (after the noted English chemist Sir Humphry Davy), but it was eventually determined to be a mixture of iridium, rhodium and iron. Another candidate, lucium, followed in 1896, but it was determined to be yttrium. Then in 1908, the Japanese chemist Masataka Ogawa found evidence in the mineral thorianite, which he thought indicated the presence of element 43. Ogawa named the element nipponium, after Japan (which is Nippon in Japanese). In 2004, H. K Yoshihara used "a record of X-ray spectrum of Ogawa's nipponium sample from thorianite [which] was contained in a photographic plate preserved by his family. The spectrum was read and indicated the absence of the element 43 and the presence of the element 75 (rhenium)."

German chemists Walter Noddack, Otto Berg, and Ida Tacke reported the discovery of element 75 and element 43 in 1925, and named element 43 masurium (after Masuria in eastern Prussia, now in Poland, the region where Walter Noddack's family originated). The group bombarded columbite with a beam of electrons and deduced element 43 was present by examining X-ray diffraction spectrograms. The wavelength of the X-rays produced is related to the atomic number by a formula derived by Henry Moseley in 1913. The team claimed to detect a faint X-ray signal at a wavelength produced by element 43. Later experimenters could not replicate the discovery, and it was dismissed as an error for many years. Still, in 1933, a series of articles on the discovery of elements quoted the name masurium for element 43. Debate still exists as to whether the 1925 team actually did discover element 43.

The discovery of element 43 was finally confirmed in a December 1936 experiment at the University of Palermo in Sicily conducted by Carlo Perrier and Emilio Segrè. In mid-1936, Segrè visited the United States, first Columbia University in New York and then the Lawrence Berkeley National Laboratory in California. He persuaded cyclotron inventor Ernest Lawrence to let him take back some discarded cyclotron parts that had become radioactive. Lawrence mailed him a molybdenum foil that had been part of the deflector in the cyclotron.

Segrè enlisted his colleague Perrier to attempt to prove, through comparative chemistry, that the molybdenum activity was indeed Z = 43. They succeeded in isolating the isotopes technetium-95 and technetium-97. University of Palermo officials wanted them to name their discovery "panormium", after the Latin name for Palermo, Panormus. In 1947 element 43 was named after the Greek word τεχνητός, meaning "artificial", since it was the first element to be artificially produced. Segrè returned to Berkeley and met Glenn T. Seaborg. They isolated the metastable isotope technetium-99m, which is now used in some ten million medical diagnostic procedures annually.

In 1952, astronomer Paul W. Merrill in California detected the spectral signature of technetium (in particular, light with wavelength of 403.1 nm, 423.8 nm, 426.8 nm, and 429.7 nm) in light from S-type red giants. The stars were near the end of their lives, yet were rich in this short-lived element, meaning nuclear reactions within the stars must be producing it. This evidence was used to bolster the then-unproven theory that stars are where nucleosynthesis of the heavier elements occurs. More recently, such observations provided evidence that elements were being formed by neutron capture in the s-process.

Since its discovery, there have been many searches in terrestrial materials for natural sources of technetium. In 1962, technetium-99 was isolated and identified in pitchblende from the Belgian Congo in extremely small quantities (about 0.2 ng/kg); there it originates as a spontaneous fission product of uranium-238. There is also evidence that the Oklo natural nuclear fission reactor produced significant amounts of technetium-99, which has since decayed into ruthenium-99.

The long half-life of technetium-99 and its ability to form an anionic species makes it a major concern for long-term disposal of radioactive waste. Many of the processes designed to remove fission products in reprocessing plants aim at cationic species like caesium (e.g., caesium-137) and strontium (e.g., strontium-90). Hence the pertechnetate is able to escape through these treatment processes. Current disposal options favor burial in continental, geologically stable rock. The primary danger with such a course is that the waste is likely to come into contact with water, which could leach radioactive contamination into the environment. The anionic pertechnetate and iodide do not adsorb well onto the surfaces of minerals, so they are likely to be washed away. By comparison plutonium, uranium, and caesium are much more able to bind to soil particles. For this reason, the environmental chemistry of technetium is an active area of research.

An alternative disposal method, transmutation, has been demonstrated at CERN for technetium-99. This transmutation process is one in which the technetium (technetium-99 as a metal target) is bombarded with neutrons to form the short-lived technetium-100 (half life = 16 seconds) which decays by beta decay to ruthenium-100. If recovery of usable ruthenium is a goal, an extremely pure technetium target is needed; if small traces of the minor actinides such as americium and curium are present in the target, they are likely to undergo fission and form more fission products which increase the radioactivity of the irradiated target. The formation of ruthenium-106 (half-life 374 days) from the 'fresh fission' is likely to increase the activity of the final ruthenium metal, which will then require a longer cooling time after irradiation before the ruthenium can be used.

The actual production of technetium-99 from spent nuclear fuel is a long process. During fuel reprocessing, it appears in the waste liquid, which is highly radioactive. After sitting for several years, the radioactivity falls to a point where extraction of the long-lived isotopes, including technetium-99, becomes feasible. Several chemical extraction processes are then used, yielding technetium-99 metal of high purity.

Technetium star

A Technetium star, or more properly a Tc-rich star, is a star whose stellar spectrum contains absorption lines of the light radioactive metal technetium. The most stable isotope of technetium is 98Tc with a half-life of 4.2 million years, which is too short a time to allow the metal to be material from before the star's creation. Therefore, the detection in 1952 of technetium in stellar spectra provided unambiguous proof of nucleosynthesis in stars, one of the more extreme cases being R Geminorum.

Stars containing technetium belong to the class of so-called asymptotic giant branch stars (AGB) — stars that are like red giants, but with a slightly higher luminosity, and which burn hydrogen in an inner shell. Members of this class of stars switch to helium shell burning with an interval of some 100,000 years, in so-called "dredge-ups". Technetium stars belong to the classes M, MS, S, SC and C-N. They are most often variable stars of the long period variable types.

Current research indicate that the presence of technetium in AGB stars occurs after some evolution, and that a significant amount of these stars do not exhibit the metal in their spectra. The presence of technetium seems to be related to the so-called "third dredge-up" in the history of the stars.

Netflix | Internet video streaming | History and definition of the Netflix | Netflix Logo/Image

Netflix, Inc., is an American provider of on-demand internet streaming video in the United States and Canada, and flat rate DVD-by-mail in the United States. The company was established in 1997 and is headquartered in Los Gatos, California. It started its subscription service in 1999 and by 2009 it was offering a collection of 100,000 titles on DVD, surpassing 10 million subscribers. On February 25, 2007, Netflix announced the billionth DVD delivery. In April 2011, Netflix announced 23.6 million subscribers. In the Summer of 2011, Netflix announced they will expand into the international market, starting in Spain by 2012.

Netflix was founded in 1997 in Scotts Valley, California by Marc Randolph and Reed Hastings, who previously had worked together at Pure Software, along with Mitch Lowe. Hastings was inspired to start the company after being charged late fees for returning a rented copy of Apollo 13 after the due date. The Netflix website launched in April 1998 with an online version of a more traditional pay-per-rental model (US $4 per rental plus US $2 in postage; late fees applied). Netflix introduced the monthly subscription concept in September 1999, then dropped the single-rental model in early 2000. Since that time the company has built its reputation on the business model of flat-fee unlimited rentals without due dates, late fees, shipping or handling fees, or per title rental fees.

Netflix developed and maintains an extensive personalized video-recommendation system based on ratings and reviews by its customers. On October 1, 2006, Netflix offered a $1,000,000 prize to the first developer of a video-recommendation algorithm that could beat its existing algorithm, Cinematch, at predicting customer ratings by more than 10%.

"Some 35,000 different film titles are contained in the 1 million DVDs it sends out every day."

Netflix has played a prominent role in independent film distribution. Through a division called Red Envelope Entertainment, Netflix licensed and distributed independent films such as Born into Brothels and Sherrybaby. As of late 2006, Red Envelope Entertainment also expanded into producing original content with filmmakers such as John Waters. Netflix announced plans to close Red Envelope Entertainment in 2008, in part to avoid competition with its studio partners.

Netflix initiated an initial public offering (IPO) on May 29, 2002, selling 5,500,000 shares of common stock at the price of US $15.00 per share. On June 14, 2002, the company sold an additional 825,000 shares of common stock at the same price. After incurring substantial losses during its first few years, Netflix posted its first profit during fiscal year 2003, earning US $6.5 million profit on revenues of US $272 million. The company is well-known for its worker-oriented culture, including unlimited vacation time for salaried workers and allowing those employees to take any amount of their paychecks in stock options.

Netflix has been one of the most successful dot-com ventures. A The New York Times article from September 2002, said that, at the time, Netflix mailed about 190,000 discs per day to its 670,000 monthly subscribers. The company's published subscriber count increased from one million in the fourth quarter of 2002 to around 5.6 million at the end of the third quarter of 2006, to 14 million in March 2010. Netflix's growth has been fueled by the fast spread of DVD players in households; as of 2004, nearly two-thirds of U.S. homes had a DVD player. Netflix capitalized on the success of the DVD and its rapid expansion into U.S. homes, integrating the potential of the Internet and e-commerce to provide services and catalogs that brick and mortar retailers could not compete with. Netflix also operates an online affiliate program which has helped it to build online sales for DVD rentals.

Netflix is a subscription-based movie and television show rental service that offers media to subscribers via Internet streaming and via US mail.

Netflix offers Internet video streaming ("Watch Instantly") of selected titles to computers running Windows or Mac OS X and to compatible devices. Internet video streaming comes at no additional charge with Netflix's regular subscription service; however, only a portion of Netflix's content is available via the "Watch Instantly" option. In its simplest form, video is streamed to the user using standard PC hardware, and requires Microsoft's Silverlight software to be installed. Viewing is initiated by pressing a "Play Instantly" button, and played back on the PC monitor. Films can be paused or restarted at will. According to a 2011 report by Sandvine, Netflix is the biggest source of North American web traffic, accounting for 24.71 percent of aggregated traffic.

Initially, the feature offered subscribers one hour of media for approximately every dollar they spent on their subscription. (A $16.99 plan, for example, entitled the subscriber to 17 hours of streaming media.) In January 2008, however, Netflix lifted this restriction. Virtually all subscribers now are entitled to unlimited hours of streaming media at no additional cost. Subscribers with a plan of $4.99/two DVDs per month, one DVD at a time, are allowed two hours which can only be watched on a computer. The new terms of the service are a response to the introduction of Apple's new video rental services.

According to Netflix Tech Support, Netflix's content library is encoded into three bandwidth tiers, in a compression format based on the VC-1 video and Windows Media audio codecs. The lowest tier requires a continuous downstream bandwidth (to the client) of 1.5Mbps, and offers stereo audio and video quality comparable to DVD. The middle tier requires 3Mbps, and offers "better than DVD quality". The highest tier requires 5 Mbps, and offers 720p HD with surround sound audio. As of December 2010, the PS3 is the only device able to stream Netflix at 1080p resolution.

Netflix does not support playback on Linux PCs although the Linux-based Roku devices are supported. It is possible to connect the Roku device, game console, or blu-ray player to a Linux PC (or directly to the computer monitor) with an adapter. It is also possible to run Windows and Netflix in a virtual machine such as Virtualbox or Qemu. In a TechRepublic interview in August 2010, Netflix's VP of Corporate Communications stated that available Silverlight plugins for Linux, such as Moonlight, do not support the PlayReady DRM system that Netflix requires for playback. Netflix does support the Android operating system, which uses the Linux kernel, although is otherwise separate from Linux.

In March 2011, Netflix announced plans to begin acquiring first-run original content for its popular Watch Instantly subscription service, beginning with the hour-long political drama House of Cards, which will debut on the streaming service in late 2012. The series will reportedly be helmed by David Fincher, with Academy Award winning actor Kevin Spacey headlining the cast.

Netflix is rumored to have outbid heavyweights HBO and AMC, two of the current market leaders in original dramatic programming. As Deadline.com reported on March 15, 2011:

"Netflix landed the drama project by offering a staggering commitment of two seasons, or 26 episodes. Given that the price tag for a high-end drama is in the $4–$6 million an episode range and that a launch of a big original series commands tens of millions of dollars for promotion, the deal, is believed to be worth more than $100 million and could change the way people consume TV shows."

Initial industry reactions largely echoed this tone, and, while generally positive, have focused heavily on Netflix's bold, risky, and potentially transformative entry into the original content game. In the face of breathless and rampant media speculation, Netflix's response has thus far been reserved and mostly focused on downplaying the potential implications in its core strategy. In an interview with All Things Digital's Peter Kafka, Netflix content chief Ted Sarandos attempted to put the situation into perspective:

"It's not much of a radical departure in what we do every day. There’s an added risk factor, in that this is the first time we’re licensing something that hasn't been produced, or at least completed."

But there's no risk factor in terms of delivery, because we're not investing development money, and we don't pay for it unless they deliver the show. But it is the first time we've made a very large commitment to a series that hasn’t been produced.

It's just a matter of your philosophy around development. Networks can typically invest tens of millions of dollars in the development of a pilot. And if they put the show on the air and it fails, that's all lost money. There's no monetization of a broken series.

We're betting on the creative team and the source material. "House of Cards" is incredible source material–the BBC version is quite popular already on Netflix. David Fincher's work has all been incredibly well-received on Netflix, and Kevin Spacey's films have all worked on Netflix. The notion that that team will produce a very good product is a pretty safe bet.

[...] If the show proves very popular, it won't be any more expensive than licensing a popular show off of a network. So economically, it's not a seismic shift, if it's popular. If it isn't, then we'll have paid more for an unpopular show than we normally would have.

The day after the after news of the acquisition broke, The Wall Street Journal responded to Deadline.com's report that Netflix could pay more than $100 million as part of a deal for 26 episodes, citing a source "[...] familiar with Netflix's plans," who claimed the actual amount will be "[...] much less than that," a sentiment echoed Peter Kafka in his influential Media Memo blog.

Despite initial media confusion to the contrary, Netflix will not be producing House of Cards directly, but rather will license it from Media Rights Capital who will deficit finance the series. Netflix will have first-run domestic exclusivity, but Media Rights Capital will own the series and retain domestic syndication, foreign distribution, worldwide DVD/Blu-ray, and all other ancillary rights.

Netflix spokesmen have declined to specify what the company will actually be paying for the series House of Cards, but as reliable sources have confirmed it to be significantly less than the series' rumored $100 million production cost, Netflix's fee for the 26 episode deal will necessarily amount to less than $3.85 million per episode. For comparison, during the 2006–2010 television seasons, Fox Broadcast Network paid a license fee of $5 million per episode to 20th Century Fox Television for 24, while satellite provider DirecTV pays license fees of only $1–$1.25 million per episode for its critically acclaimed series Damages and Friday Night Lights. Netflix's licensing costs for House of Cards will therefore fall somewhere between that of a typical high-end hour-long network drama and a modestly budgeted niche cable production.

Another significant cost factor for the series will be Netflix's unique marketing strategy, which, unlike the networks, does not involve spending "anything" to promote the series. According to Netflix spokesman Steve Swasey, "You won't see billboards or TV ads or banner ads." Instead, Netflix will rely entirely on its recommendation technology to suggest House of Cards only to its subscribers who are most likely to enjoy it—viewers who, for example, enjoy political dramas, films by David Fincher, and liked American Beauty and The Usual Suspects. It remains unclear however if or how Netflix plans to leverage House of Cards to drive subscriber growth. But regardless, the frenzy of press attention that emerged even before the acquisition was officially announced demonstrates that, at least for now, public and media interest in the series are high.

At E3 2008, Microsoft announced a deal to distribute Netflix videos over Xbox Live. This service was launched on November 19, 2008 to Xbox 360 owners with a Netflix Unlimited subscription and an Xbox Live Gold subscription allowing them to stream movies and TV shows directly from their Netflix Instant Queue from an application on the Dashboard.

In October 2009, Sony Computer Entertainment and Netflix announced that the service would also be available on the PlayStation 3 from November 2009. The set-up was similar to that on the Xbox 360, allowing Netflix subscribers to stream movies, videogames, and TV shows from their Instant Queue to watch on the console. Unlike on the Xbox 360, the Netflix application was originally available on a Blu-ray Disc (available free to subscribers). On October 19, 2010, a downloadable application was made available through the PlayStation Network. Users do not have to pay for use of the service other than the monthly Netflix subscription.

On January 13, 2010, Nintendo and Netflix announced that the service would become available on the Wii. This service was launched in Spring 2010. The service allows the console to stream content in a user's Instant Queue. Initially, a streaming disc specifically for the Wii was required along with an Internet connection to the console. Besides a Netflix account with unlimited streaming, there are no additional costs for the service. In contrast to the other two consoles, the Wii is not capable of HD resolution. The Wii streaming disc was released for testing to customers starting Thursday March 25, 2010. The disc was released to all registered Netflix members on April 12, 2010. On October 18, 2010, the streaming disc on the Wii was no longer necessary as Netflix became a free downloadable application on the Wii Shop Channel. On the PlayStation 3, the streaming disc is also no longer necessary, as members can download the application through the PlayStation Store, and will be a tab under the XMB.

On June 14, 2011, Nintendo's president Satoru Iwata confirmed that Wii's successor console, the Wii U will also have support for Netflix. Netflix service will launch for the Nintendo 3DS during the Summer of 2011.

Netflix's success has inspired a number of other DVD rental companies both in the United States and abroad, but none of the purely online companies appear to approach Netflix in terms of market share or revenues. Wal-Mart began an online rental service in October 2002, but left the market in May 2005 and now has a cross-promotional arrangement with Netflix. Netflix has also cited Amazon.com as a potential competitor, which until 2008 offered online video rentals in the UK and Germany (now sold to LoveFilm), but has remained coy about any similar intentions for the North American market. Amazon bought Lovefilm in 2011.

Blockbuster Video, the world's largest in-store video rental chain, entered the U.S. online market in August 2004 with a US$19.95 monthly subscription service. This sparked a price war; Netflix had raised its popular three-disc plan from US$19.95 to US$21.99 just prior to Blockbuster's launch, but by October Netflix reduced this fee to US$17.99. Blockbuster responded with rates as low as US$14.99 for a time, but by August 2005, both companies settled at the (identical) current rates. On July 22, 2007, Netflix announced that it would drop the prices of its two most popular plans by US$1.00 in an effort to better compete with Blockbuster's online-only offerings. Blockbuster's subscriber base after one year was roughly a third of Netflix's size and growing, including promotions such as the option to swap DVDs rented online at neighborhood stores and the simultaneous elimination of late fees altogether. Netflix has also been credited with playing a large part in the bankruptcy and shrinkage of several movie rental chains including Blockbuster and Movie Gallery.

Many in-store video rental chains now have unlimited rental plans similar to those of Netflix. Hollywood Video started its Movie Value Pass (MVP) service in late 2004, which enables customers to rent up to three movies at a time (due in five days) for US$15 a month. New releases, however, are typically excluded from the service for two to six weeks in the MVP "Basic" plan. Blockbuster started Movie Pass in 2004, which lets customers keep two to three DVDs at a time for US$25–30 a month, without restrictions or due dates. Hollywood's MVP "Premium" plan offers the same benefits for a comparable price. Both services still require the customer to travel to the store to rent and return the movies, and their respective selections are not as diverse as that offered by Netflix.

Redbox is another competitor that uses a kiosk approach: rather than mailing DVDs, customers pick up and return DVDs at self-service kiosks located in metropolitan areas. Coinstar, the owners of Redbox also plan to launch an online streaming service in early 2011. Some speculate this service to be offered at $3.95 per month.

Netflix and Blockbuster largely avoid offering pornography, but several adult-video subscription services were inspired by Netflix, such as SugarDVD and WantedList. (However, Netflix's catalogue does include films with explicit sexual content, such as Shortbus, 9 Songs, and several movies by Jesús Franco, that are not purely targeted at sexual titillation but which have been compared to pornography.)

Law of competition | Understanding and definition of Competition law | Competition law Image

Competition law, known in the United States as antitrust law, is law that promotes or maintains market competition by regulating anti-competitive conduct.

The history of competition law reaches back to the Roman Empire. The business practices of market traders, guilds and governments have always been subject to scrutiny, and sometimes severe sanctions. Since the 20th century, competition law has become global. The two largest and most influential systems of competition regulation are United States antitrust law and European Union competition law. National and regional competition authorities across the world have formed international support and enforcement networks.

Modern competition law has historically evolved on a country level to promote and maintain competition in markets principally within the territorial boundaries of nation-states. Yet, at present most regimes allows for extraterritorial jurisdiction in antitrust cases based on so-called effects doctrine.

The protection of international competition is governed by international competition agreements. In 1945, during the negotiations preceding the adoption of the General Agreement on Tariffs and Trade (GATT) in 1947, limited international competition obligations were proposed within the Charter for an International Trade Organisation. These obligations were not included in GATT, but in 1994, with the conclusion of the Uruguay Round of GATT Multilateral Negotiations, the World Trade Organization (WTO) was created. The Agreement Establishing the WTO included a range of limited provisions on various cross-border competition issues on a sector specific basis.

Competition law, or antitrust law, has three main elements:

1. prohibiting agreements or practices that restrict free trading and competition between business. This includes in particular the repression of free trade caused by cartels.
2. banning abusive behavior by a firm dominating a market, or anti-competitive practices that tend to lead to such a dominant position. Practices controlled in this way may include predatory pricing, tying, price gouging, refusal to deal, and many others.
3. supervising the mergers and acquisitions of large corporations, including some joint ventures. Transactions that are considered to threaten the competitive process can be prohibited altogether, or approved subject to "remedies" such as an obligation to divest part of the merged business or to offer licenses or access to facilities to enable other businesses to continue competing.

Substance and practice of competition law varies from jurisdiction to jurisdiction. Protecting the interests of consumers (consumer welfare) and ensuring that entrepreneurs have an opportunity to compete in the market economy are often treated as important objectives. Competition law is closely connected with law on deregulation of access to markets, state aids and subsidies, the privatization of state owned assets and the establishment of independent sector regulators, among other market-oriented supply-side policies. In recent decades, competition law has been viewed as a way to provide better public services. Robert Bork has argued that competition laws can produce adverse effects when they reduce competition by protecting inefficient competitors and when costs of legal intervention are greater than benefits for the consumers.

Ideas about competitive law were published during the 18th century with such works as Adam Smith's The Wealth of Nations. Different terms were used to describe this area of the law, including "restrictive practices", "the law of monopolies", "combination acts" and the "restraint of trade".

An early example of competition law is the Lex Julia de Annona, enacted during the Roman Republic around 50 BC. To protect the grain trade, heavy fines were imposed on anyone directly, deliberately and insidiously stopping supply ships. Under Diocletian in 301 AD an edict imposed the death penalty for anyone violating a tariff system, for example by buying up, concealing or contriving the scarcity of everyday goods.

More legislation came under the Constitution of Zeno of 483 AD, which can be traced into Florentine Municipal laws of 1322 and 1325. This provided for confiscation of property and banishment for any trade combination or joint action of monopolies private or granted by the Emperor. Zeno rescinded all previously granted exclusive rights. Justinian I subsequently introduced legislation to pay officials to manage state monopolies. As Europe slipped into the Dark Ages, so did the records of law making until the Middle Ages brought greater expansion of trade in the time of lex mercatoria.

Legislation in England to control monopolies and restrictive practices were in force well before the Norman Conquest. The Domesday Book recorded that "foresteel" (i.e. forestalling, the practice of buying up goods before they reach market and then inflating the prices) was one of three forfeitures that King Edward the Confessor could carry out through England. But concern for fair prices also led to attempts to directly regulate the market. Under Henry III an act was passed in 1266 to fix bread and ale prices in correspondence with grain prices laid down by the assizes. Penalties for breach included amercements, pillory and tumbrel. A 14th century statute labeled forestallers as "oppressors of the poor and the community at large and enemies of the whole country." Under King Edward III the Statute of Laborers of 1349 fixed wages of artificers and workmen and decreed that foodstuffs should be sold at reasonable prices. On top of existing penalties, the statute stated that overcharging merchants must pay the injured party double the sum he received, an idea that has been replicated in punitive treble damages under US antitrust law. Also under Edward III, the following statutory provision outlawed trade combination.

"...we have ordained and established, that no merchant or other shall make Confederacy, Conspiracy, Coin, Imagination, or Murmur, or Evil Device in any point that may turn to the Impeachment, Disturbance, Defeating or Decay of the said Staples, or of anything that to them pertaineth, or may pertain."

Examples of legislation in mainland Europe include the constitutiones juris metallici by Wenceslaus II of Bohemia between 1283 and 1305, condemning combination of ore traders increasing prices; the Municipal Statutes of Florence in 1322 and 1325 followed Zeno's legislation against state monopolies; and under Emperor Charles V in the Holy Roman Empire a law was passed "to prevent losses resulting from monopolies and improper contracts which many merchants and artisans made in the Netherlands." In 1553 King Henry VIII reintroduced tariffs for foodstuffs, designed to stabilize prices, in the face of fluctuations in supply from overseas. So the legislation read here that whereas,

"it is very hard and difficult to put certain prices to any such things... [it is necessary because] prices of such victuals be many times enhanced and raised by the Greedy Covetousness and Appetites of the Owners of such Victuals, by occasion of ingrossing and regrating the same, more than upon any reasonable or just ground or cause, to the great damage and impoverishing of the King's subjects."

Around this time organizations representing various tradesmen and handicrafts people, known as guilds had been developing, and enjoyed many concessions and exemptions from the laws against monopolies. The privileges conferred were not abolished until the Municipal Corporations Act 1835.

Competition law has already been substantially internationalized along the lines of the US model by nation states themselves, however the involvement of international organizations has been growing. Increasingly active at all international conferences are the United Nations Conference on Trade and Development (UNCTAD) and the Organisation for Economic Co-operation and Development (OECD), which is prone to making neo-liberal recommendations about the total application of competition law for public and private industries. Chapter 5 of the post war Havana Charter contained an Antitrust code but this was never incorporated into the WTO's forerunner, the General Agreement on Tariffs and Trade 1947. Office of Fair Trading Director and Professor Richard Whish wrote sceptically that it "seems unlikely at the current stage of its development that the WTO will metamorphose into a global competition authority." Despite that, at the ongoing Doha round of trade talks for the World Trade Organization, discussion includes the prospect of competition law enforcement moving up to a global level. While it is incapable of enforcement itself, the newly established International Competition Network (ICN) is a way for national authorities to coordinate their own enforcement activities.

It is unclear whether competition policy is a sensible role for government in developing, particularly low-income countries. In these countries the markets are usually very small and fragmented so that developing scale sufficient to raise competitiveness and engage in international markets is a major challenge. The bigger problem is however poor governance - in societies with widespread corruption, inadequate public finances, and weak judiciary and oversight institutions, competition policy may become another tool for capture by vested interests - becoming in itself a barrier to entry.

Under the doctrine of laissez-faire, antitrust is seen as unnecessary as competition is viewed as a long-term dynamic process where firms compete against each other for market dominance. In some markets a firm may successfully dominate, but it is because of superior skill or innovativeness. However, according to laissez-faire theorists, when it tries to raise prices to take advantage of its monopoly position it creates profitable opportunities for others to compete. A process of creative destruction begins which erodes the monopoly. Therefore, government should not try to break up monopoly but should allow the market to work.

The classical perspective on competition was that certain agreements and business practice could be an unreasonable restraint on the individual liberty of tradespeople to carry on their livelihoods. Restraints were judged as permissible or not by courts as new cases appeared and in the light of changing business circumstances. Hence the courts found specific categories of agreement, specific clauses, to fall foul of their doctrine on economic fairness, and they did not contrive an overarching conception of market power. Earlier theorists like Adam Smith rejected any monopoly power on this basis.

"A monopoly granted either to an individual or to a trading company has the same effect as a secret in trade or manufactures. The monopolists, by keeping the market constantly under-stocked, by never fully supplying the effectual demand, sell their commodities much above the natural price, and raise their emoluments, whether they consist in wages or profit, greatly above their natural rate."

In The Wealth of Nations (1776) Adam Smith also pointed out the cartel problem, but did not advocate legal measures to combat them.

"People of the same trade seldom meet together, even for merriment and diversion, but the conversation ends in a conspiracy against the public, or in some contrivance to raise prices. It is impossible indeed to prevent such meetings, by any law which either could be executed, or would be consistent with liberty and justice. But though the law cannot hinder people of the same trade from sometimes assembling together, it ought to do nothing to facilitate such assemblies; much less to render them necessary."

By the latter half of the 19th century it had become clear that large firms had become a fact of the market economy. John Stuart Mill's approach was laid down in his treatise On Liberty (1859).

"Again, trade is a social act. Whoever undertakes to sell any description of goods to the public, does what affects the interest of other persons, and of society in general; and thus his conduct, in principle, comes within the jurisdiction of society... both the cheapness and the good quality of commodities are most effectually provided for by leaving the producers and sellers perfectly free, under the sole check of equal freedom to the buyers for supplying themselves elsewhere. This is the so-called doctrine of Free Trade, which rests on grounds different from, though equally solid with, the principle of individual liberty asserted in this Essay. Restrictions on trade, or on production for purposes of trade, are indeed restraints; and all restraint, qua restraint, is an evil..."

After Mill, there was a shift in economic theory, which emphasized a more precise and theoretical model of competition. A simple neo-classical model of free markets holds that production and distribution of goods and services in competitive free markets maximizes social welfare. This model assumes that new firms can freely enter markets and compete with existing firms, or to use legal language, there are no barriers to entry. By this term economists mean something very specific, that competitive free markets deliver allocative, productive and dynamic efficiency. Allocative efficiency is also known as Pareto efficiency after the Italian economist Vilfredo Pareto and means that resources in an economy over the long run will go precisely to those who are willing and able to pay for them. Because rational producers will keep producing and selling, and buyers will keep buying up to the last marginal unit of possible output – or alternatively rational producers will be reduce their output to the margin at which buyers will buy the same amount as produced – there is no waste, the greatest number wants of the greatest number of people become satisfied and utility is perfected because resources can no longer be reallocated to make anyone better off without making someone else worse off; society has achieved allocative efficiency. Productive efficiency simply means that society is making as much as it can. Free markets are meant to reward those who work hard, and therefore those who will put society's resources towards the frontier of its possible production. Dynamic efficiency refers to the idea that business which constantly competes must research, create and innovate to keep its share of consumers. This traces to Austrian-American political scientist Joseph Schumpeter's notion that a "perennial gale of creative destruction" is ever sweeping through capitalist economies, driving enterprise at the market's mercy. This led Schumpeter to argue that monopolies did not need to be broken up (as with Standard Oil) because the next gale of economic innovation would do the same.

Contrasting with the allocatively, productively and dynamically efficient market model are monopolies, oligopolies, and cartels. When only one or a few firms exist in the market, and there is no credible threat of the entry of competing firms, prices rise above the competitive level, to either a monopolistic or oligopolistic equilibrium price. Production is also decreased, further decreasing social welfare by creating a deadweight loss. Sources of this market power are said[by whom?] to include the existence of externalities, barriers to entry of the market, and the free rider problem. Markets may fail to be efficient for a variety of reasons, so the exception of competition law's intervention to the rule of laissez faire is justified if government failure can be avoided. Orthodox economists fully acknowledge that perfect competition is seldom observed in the real world, and so aim for what is called "workable competition". This follows the theory that if one cannot achieve the ideal, then go for the second best option by using the law to tame market operation where it can.

Technorati Blog | Understanding and definition Technorati | Technorati Image

Technorati is an Internet search engine for searching blogs. By June 2008, Technorati was indexing 112.8 million blogs and over 250 million pieces of tagged social media. The name Technorati is a blend of the words technology and literati, which invokes the notion of technological intelligence or intellectualism.

Technorati was founded by Dave Sifry and its headquarters are in San Francisco, California, USA. Tantek Çelik was the site's Chief Technologist.

Technorati uses and contributes to open source software. Technorati has an active software developer community, many of them from open-source culture. Sifry is a major open-source advocate, and was a founder of LinuxCare and later of Wi-Fi access point software developer Sputnik. Technorati includes a public developers' wiki, where developers and contributors collaborate, also various open APIs.

The site won the SXSW 2006 awards for Best Technical Achievement and also Best of Show. It was also nominated for a 2006 Webby Award for Best Practices, but lost to Flickr and Google Maps. In 2010, Technorati was recognized as one of the “2010 Hottest San Francisco Companies” by Lead411.

Technorati looks at tags that authors have placed on their websites. These tags help categorize search results, with recent results coming first.

Technorati rates each blog's "authority", the number of unique blogs linking to the blog over the previous six months.

In February 2006, Debi Jones pointed out that Technorati's "State of the Blogosphere" postings, which then claimed to track 27.7 million blogs, did not take into account MySpace blogs, of which she said that there were 56 million. As a result, she said that the utility of Technorati as a gauge of blog popularity was questionable. However, by March 2006, Aaron Brazell pointed out that Technorati had started tracking MySpace blogs.

In May 2006, Technorati teamed up with the PR agency Edelman. The deal earned a lot of criticism, both on principle and as a result of Edelman's 2006 fake blog scandals. Edelman and Technorati officially ended the deal in December 2006. That month, Oliver Reichenstein pointed out that the so-called "State of the Blogosphere" was more of a PR-tool and money maker for Edelman and Technorati than a reliable source, explaining in particular: a) why Technorati/Edelman's claim that "31% of the blogs are written in Japanese" was "bogus", and b) where the financial profit for the involved parties was in this.

In May 2007, Andrew Orlowski, writing for the tech tabloid The Register, criticized Technorati's May 2007 redesign. He suggested that Technorati had decided to focus more on returning image thumbnails rather than blog results. He also claimed that Technorati never quite worked correctly in the past and that the alleged refocus was "a tacit admission that it's given up on its original mission".

In August 2008, Technorati acquired the online magazine, Blogcritics, for an undisclosed sum of money. As a result, Blogcritic's founders - publisher Eric Olsen and technical director Phillip Winn - became full-time Technorati employees. One of the first collaborative ventures of the two entities was for Blogcritics writers to begin writing descriptions of Technorati tags.

In April 2009, Blogcritics underwent a complete site redesign and switched content management systems.

In 2009, Technorati decided to stop indexing blogs and sites in languages other than English in order to focus only on the English-language blogosphere. As a result, thousands of sites in various languages are no longer rated by the Technorati service.

Since its relaunch in 2009, there have been a range of complaints from Technorati users about issues such as the basic blog search not working for many months or problems with the blog claiming process. It appears that as late as November 2010 several of these issues have not been addressed. Technorati also appears to have stopped responding to these issues.