| hood | 1. State; condition. "How could thou ween, through that disguised hood To hide thy state from being understood?" (Spenser) 2. A covering or garment for the head or the head and shoulders, often attached to the body garment; especially: A soft covering for the head, worn by women, which leaves only the face exposed. A part of a monk's outer garment, with which he covers his head; a cowl. "All hoods make not monks." . A like appendage to a cloak or loose overcoat, that may be drawn up over the head at pleasure. An ornamental fold at the back of an academic gown or ecclesiastical vestment; as, a master's hood. A covering for a horse's head. <veterinary> A covering for a hawk's head and eyes. 3. Anything resembling a hood in form or use; as: The top or head of a carriage. A chimney top, often contrived to secure a constant draught by turning with the wind. A projecting cover above a hearth, forming the upper part of the fireplace, and confining the smoke to the flue. The top of a pump. A covering for a mortar. <botany> A covering or porch for a companion hatch. 4. The endmost plank of a strake which reaches the stem or stern. Origin: OE. Hood, hod, AS. Hod; akin to D. Hoed hat, G. Hut, OHG. Huot, also to E. Hat, and prob. To E. Heed. Source: Websters Dictionary (01 Mar 1998) |
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| dorsal hood | A triangular tendinous aponeurosis including the tendon of the extensor digitorum centrally, interosseus tendons on each side, and a lumbrical tendon laterally. It covers the dorsal aspect of the metacarpophalangeal joint and the proximal phalanx. Synonym: dorsal hood, extensor aponeurosis, extensor expansion. (05 Mar 2000) |
| alactic oxygen debt | That part of the oxygen debt that is not lactacid oxygen debt; during recovery, stores of ATP and creatine phosphate must be replenished by oxidative metabolism, and a small amount of oxygen is also needed to restore the normal oxyhemoglobin levels throughout the circulating blood. (05 Mar 2000) |
| alveolar-arterial oxygen difference | The difference or gradient between the partial pressure of oxygen in the alveolar spaces and the arterial blood: P(A-a)02. Normally in young adults this value is less than 20 mm Hg. See: alveolar gas equation. (05 Mar 2000) |
| arteriovenous oxygen difference | <physiology> The difference in the oxygen content (in ml per 100 ml blood) between arterial and venous blood. (05 Mar 2000) |
| biochemical oxygen demand | The amount of oxygen aerobicorganisms need to carry out oxidative metabolism in watercontaining organic matter, such as sewage. (09 Oct 1997) |
| carbon-oxygen ligases | <enzyme> Enzymes that catalyze the joining of two molecules by the formation of a carbon-oxygen bond. Registry number: EC 6.1 (12 Dec 1998) |
| carbon-oxygen lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-oxygen bond by means other than hydrolysis or oxidation. Registry number: EC 4.2 (12 Dec 1998) |
| reactive oxygen species | Reactive intermediate oxygen species including both radicals and non-radicals. These substances are constantly formed in the human body and have been shown to kill bacteria and inactivate proteins, and have been implicated in a number of diseases. Scientific data exist that link the reactive oxygen species produced by inflammatory phagocytes to cancer development. (12 Dec 1998) |
| chemical oxygen demand | The amount of dissolved oxygen required to combine with chemicals in wastewater. A measure of the oxygen equivalent of that portion of organic matter that is susceptible to oxidation by a strong chemical oxidizing agent. (05 Dec 1998) |
| rubredoxin-oxygen oxidoreductase | <enzyme> Contains fad and a new type of haem; site of oxygen reduction to water by desulfovibrio gigas coupled with NADH oxidation Registry number: EC 1.9.3.- Synonym: rubredoxin oxidase (26 Jun 1999) |
| phosphorus-oxygen lyases | <enzyme> Enzymes that catalyze the cleavage of a phosphorus-oxygen bond by means other than hydrolysis or oxidation. Registry number: EC 4.6 (12 Dec 1998) |
| critical dissolved oxygen concentration | <biology> The minimum concentration of oxygen in the water needed for the growth of a culture which has been submerged, where oxygen is the limiting factor to the growth of the culture. (09 Oct 1997) |
| heavy oxygen | A stable oxygen isotope making up 0.20% of natural oxygen; used in mass spectrometry and in NMR studies of tissue. Synonym: heavy oxygen. (05 Mar 2000) |
| home oxygen therapy | A form of oxygen that is typically delivered via nasal cannula. Commonly provided to those with severe heart or lung disease. See: chronic obstructive pulmonary disease. (27 Sep 1997) |