| heterodactyl | <zoology> Heterodactylous. One of the Heterodactylae. Source: Websters Dictionary (01 Mar 1998) |
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| heterodactylae | <ornithology> A group of birds including the trogons. Origin: NL, fr. Gr. Other + a finger. Source: Websters Dictionary (01 Mar 1998) |
| heterodactylous | <zoology> Having the first and second toes turned backward, as in the trogons. Origin: Hetero- + Gr. A toe. Source: Websters Dictionary (01 Mar 1998) |
| heterodermic | An obsolete term denoting skin grafting in which the grafts are taken from the skin of an animal of another species (dermatoheteroplasty). Origin: hetero-+ G. Derma, skin (05 Mar 2000) |
| heterodetic peptide | A peptide that contains peptide bonds as well as covalent linkages between certain amino acid residues that are not peptide bonds; e.g., valinomycin, oxytocin. Origin: hetero-+ G. Detos, bound, fr. Deo, to bind, + -ic (05 Mar 2000) |
| heterodimer | <biochemistry> A dimer in which the two subunits are different. One of the best known examples is tubulin that is found as an _ tubulin/_ tubulin dimer. Heterodimers are relatively common and it may be that the arrangement has the advantage that, for example: several different binding subunits may interact with a conserved signalling subunit. (18 Nov 1997) |
| heterodisperse | Of varying size; describing aerosols whose particles are not uniform in size. (05 Mar 2000) |
| heterodisulfide reductase | <enzyme> A two-subunit cytochrome b-containing enzyme from methanol-grown methanosarcina barkeri; catalyses the terminal step in the energy-conserving electron transport chain in methanogenic archaea; has been sequenced; authors give EC number as 1.99.4.- (not in enzyme nomenclature) Registry number: EC 1.12.99.- (26 Jun 1999) |
| heterodont | <anatomy> Having the teeth differentiated into incisors, canines, and molars, as in man; opposed to homodont. Origin: Hetero- + Gr, a tooth. <zoology> Any animal with heterodont dentition. Source: Websters Dictionary (01 Mar 1998) |
| Heterodoxus spiniger | A biting louse of the dog, sometimes called the kangaroo louse. (05 Mar 2000) |
| heterodromous | 1. <botany> Having spirals of changing direction. 2. <mechanics> Moving in opposite directions; said of a lever, pulley, etc, in which the resistance and the actuating force are on opposite sides of the fulcrum or axis. Origin: Hetero- + Gr. To run. Source: Websters Dictionary (01 Mar 1998) |
| heteroduplex | <molecular biology> DNA in which the two strands are different, either of different heritable origin, formed in vitro by annealing similar strands with some complementary sequences or formed of mRNA and the corresponding DNA strand. (18 Nov 1997) |
| heteroduplex DNA | <molecular biology> This is DNA that contains complementary strands from two different DNA molecules with similar sequences. (09 Oct 1997) |
| heteroduplex mapping | <molecular biology> Heteroduplex mapping is a lab technique used to locate a particular sequence of nucleotides. It involves making a heteroduplex by pairing the unknown nucleic acid strand with a reference strand which has a known sequence. (09 Oct 1997) |
| heterodymus | Unequal conjoined twins in which the incomplete parasite, consisting of head and neck and, to some extent, thorax, is attached to the anterior surface of the autosite. See: conjoined twins. Origin: hetero-+ G. Didymos, twin (05 Mar 2000) |