| Hartnup | Surname of British family in which the disease was first described. See: Hartnup disease, syndrome. (05 Mar 2000) |
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| Hartnup disease | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartnup disorder | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartnup syndrome | <biochemistry> Amino acid transport defect that leads to excessive loss of monoamino monocarboxylic acids (cystine, lysine, ornithine, arginine) in the urine and poor absorption in the gut. See: iminoglycinuria. (18 Nov 1997) |
| Hartree-Fock approximation | <radiobiology> A refinement of the Hartree method in which one uses determinants of single-particle wave functions rather than products, thereby introducing exchange terms into the Hamiltonian. (06 Mar 1998) |
| harts clover | <botany> Melilot or sweet clover. (06 Mar 1998) |
| hartshorn | 1. <zoology> The horn or antler of the hart, or male red deer. 2. <alchemy> Spirits of hartshorn; volatile salts. Hartshorn plantain, a solution of ammonia in water; so called because formerly obtained from hartshorn shavings by destructive distillation. Similar ammoniacal solutions from other sources have received the same name. (06 Mar 1998) |
| hartwort | <botany> A coarse umbelliferous plant of Europe (Tordylium maximum). The name is often vaguely given to other plants of the same order, as species of Seseli and Bupleurum. Source: Websters Dictionary (01 Mar 1998) |
| harvest | 1. The gathering of a crop of any kind; the ingathering of the crops; also, the season of gathering grain and fruits, late summer or early autumn. "Seedtime and harvest . . . Shall not cease." (Gen viii. 22) "At harvest, when corn is ripe." (Tyndale) 2. That which is reaped or ready to be reaped or gathed; a crop, as of grain (wheat, maize, etc), or fruit. "Put ye in the sickle, for the harvest is ripe." (Joel III. 13) "To glean the broken ears after the man That the main harvest reaps." (Shak) 3. The product or result of any exertion or labour; gain; reward. "The pope's principal harvest was in the jubilee." (Fuller) "The harvest of a quiet eye." (Wordsworth) Harvest fish See Daddy longlegs. Origin: OE. Harvest, hervest, AS. Haerfest autumn; akin to LG. Harfst, D. Herfst, OHG. Herbist, G. Herbst, and prob. To L. Carpere to pluck, Gr. Fruit. Source: Websters Dictionary (01 Mar 1998) |
| harvest bug | The larva of Trombicula species. (05 Mar 2000) |
| harvester | 1. One who harvests; a machine for cutting and gathering grain; a reaper. 2. <zoology> A harvesting ant. Source: Websters Dictionary (01 Mar 1998) |
| harvester ant | A genus of ants that attack humans and small animals. Synonym: harvester ant. Origin: G. Pogon, beard, + myrmex, ant (05 Mar 2000) |
| harvesting | 1. <cell culture> The collecting of cells, organisms, or the growth medium upon which an experimental population (of cells or microorganisms) had grown, so that the collection can be analysed or so biochemicals can be extracted from it. 2. <zoology> Harvesting ant, any species of ant which gathers and stores up seeds for food. Many species are known. The species found in Southern Europe and Palestine are Aphenogaster structor and A. Barbara; that of Texas, called agricultural ant, is Pogonomyrmex barbatus or Myrmica molifaciens; that of Florida is Pogonomyrmex crudelis. (06 Mar 1998) |
| harvestman | 1. A man engaged in harvesting. 2. <zoology> See Daddy longlegs. Source: Websters Dictionary (01 Mar 1998) |
| Harvey | William, 1578-1657. English anatomist, physiologist, and physician who first described the circulation of the blood in 1628. He understood that the interventricular septum is not porous so blood can not pass through it. He demonstrated the volume of blood which passes unidirectionally through a segment of a peripheral vein exceeds the volume of blood within the body, so blood must recirculate. He described the organization of the foetal circulation and the transition to the postnatal organization. (05 Mar 2000) |