Mindblown: a blog about philosophy.
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Os trigonum
A small accessory bone behind the ankle joint which is present in about 7 per cent of the population. It may be damaged by energetic springing from the toes in ballet, jumping or fast bowling.
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Osteitis fibrosa cystica
Replacement of bone by a highly cellular and vascular connective tissue. It is due to excessive parathyroid activity, and is seen in some patients with primary hyperparathyroidism and those with uraemic osteodystrophy the secondary hyperparathyroidism that occurs in patients with chronic renal disease.
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Organophosphorus
Organophosphorus insecticides act by inhibiting the action of cholinesterase. For this reason they are also toxic to humans and must therefore be handled with great care. The most widely used are parathion and malathion. Organophosphorus has also been used to make nerve gases.
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Organic substances
Organic Substances are those obtained from animal or vegetable bodies, or which resemble in chemical composition those derived from this source. Organic chemistry has come to mean the chemistry of the carbon compounds.
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Opportunistic
A description usually applied to infection resulting from an organism that does not normally cause disease in a healthy individual. The body’s defense mechanism can usually combat these organisms, but if it is impaired as happens in AIDS/HIV or other immune deficiencies opportunistic infection may develop. Some viral and fungal infections behave in this way.…
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Opioid poisoning
The most common effects of opioid overdose are vomiting, drowsiness, pinpoint pupils, bradycardia, convulsions and coma. Respiratory depression is common and may lead to cyanosisS and respiratory arrest. Hypotension occurs occasionally, and in severe cases non-cardiogenic pulmonary oedema and cardiovascular collapse may occur. Cardiac arrhythmia may occur with some opioids. Some opioids have a histamine-releasing…
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Odgenesis
The production of mature egg cells by the ovaries. Germ cells in the ovary multiply to produce oogonia, which divide by meiosis to form odcytes in the fetus.
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Office for national statistics
This is an executive agency of the UK government which compiles and publishes statistics on national and local populations, including their social and economic situation and their contributions to the country’s economy. It also records the demographic patterns of births, marriages and deaths, including the medical causes of death. It organizes a nationwide, ten-yearly census…
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Oestrogen receptor
A site on the membrane surrounding a cell that binds to the hormone oestrogens. This activates the cell’s reaction to this hormone. Anti-oestrogen drugs such as tamoxifen used to treat breast cancer prevent the oestrogen binding to these receptors.
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Diseases of oesophagus
Oesophagitis is inflammation of the oesophagus and may be due to swallowing a corrosive chemical (corrosive oesophagitis) or because the muscles of the lower part of the oesophagus fail to work properly (achalasia), allowing the stomach’s acidic contents to regurgitate (reflux oesophagitis). hiatus hernia is sometimes associated with the latter condition. Diagnosis can be made…
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