| heterochromatin | <cell biology, genetics> The chromosomal regions that are condensed during interphase and at the time of nuclear division. They show what is considered an abnormal pattern of staining as opposed to euchromatin. Can be subdivided into constitutive regions (present in all cells) and facultative heterochromatin (present in some cells only). The inactive X chromosome of female mammals is an example of facultative heterochromatin. (18 Nov 1997) |
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| heterochromatin, constituitive | Heterochromatin that is fixed and irreversible. Regions of constituitive heterochromatin are located at very specific spots in the genome (on chromosomes 1, 9, 16 and the y chromosome, the tiny short arms of chromosomes 13-15 and 21 and 22, and near the centromeres of chromosomes) and consists of DNA that contains many tandem (not inverted) repeats of a short basic repeating unit (known as satellite DNA). (12 Dec 1998) |
| heterochromatin, facultative | Heterochromatin that need not always be heterochromatic but has the faculty to return to the normal euchromatic state. The inactive x chromosome is made up of facultatative heterochromatin. When a woman transmits that x to a son, it reverts to euchromatin and genetic activity. (12 Dec 1998) |
| heterochromia | Different colours. (12 Dec 1998) |
| heterochromia iridis | A difference of colour between the iris of one eye and the other. (a person with one brown and one blue eye has heterochromia iridis.) also, a difference in colour within an iris (sectoral heterochromia iridis). (12 Dec 1998) |
| heterochromic cyclitis | A chronic inflammatory cyclitis in which the iris of the affected eye becomes atrophic. (05 Mar 2000) |
| heterochromic uveitis | Anterior uveitis and depigmentation of the iris. Synonym: Fuchs' uveitis. (05 Mar 2000) |
| heterochromosome | <genetics> One or more chromosomes that can be distinguished from autosomes by their morphology and behaviour. Synonym: accessory chromosome, heterochromosome, sex chromosome. (18 Nov 1997) |
| heterochromous | <botany> Having the central florets of a flower head of a different colour from those of the circumference. Origin: Hetero- + Gr. Colour. Source: Websters Dictionary (01 Mar 1998) |
| heterochron | Having varying chronaxies. Origin: hetero-+ G. Chronos, time (05 Mar 2000) |
| heterochronia | Origin or development of tissues or organs at an unusual time or out of the regular sequence. Compare: synchronia. Origin: hetero-+ G. Chronos, time (05 Mar 2000) |
| heterochronic | Relating to heterochronia. Synonym: heterochronic. (05 Mar 2000) |
| heterochronous | Relating to heterochronia. Synonym: heterochronic. (05 Mar 2000) |
| heterochrony | Lack of synchronisation. (18 Nov 1997) |
| heterocladic | Denoting an anastomosis between branches of different arterial trunks, as distinguished from homocladic. Origin: hetero-+ G. Klados, a twig (05 Mar 2000) |
Synonyms : A-B Family hnRNP Proteins, Type A-B hnRNP Proteins, hnRNP A2-B1, A B Family hnRNP Proteins, Heterogeneous Nuclear Ribonucleoprotein Group A B, Type A B hnRNP Proteins, hnRNP A B Proteins
Synonyms : C-Type Protein HnRNP, HNRNP C Protein, Heterogeneous-Nuclear Ribonucleoprotein C, Heterogeneous-Nuclear Ribonucleoprotein Type C1-C2, hnRNP C Proteins, hnRNP C1-C2 Proteins, Heterogeneous Nuclear Ribonucleoprotein C, Ribonucleoprotein C, Heterogeneous-Nuclear
Synonyms : Heterogeneous-Nuclear Ribonucleoprotein Group F, Heterogeneous-Nuclear Ribonucleoprotein Group H, Heterogeneous-Nuclear Ribonucleoprotein H-H'-F-2H9 Family, hnRNP F, hnRNP F-H, hnRNP H, hnRNP-F, hnRNP-H, Heterogeneous Nuclear Ribonucleoprotein Group F
Synonyms : Heterogeneous-Nuclear Ribonucleoprotein M, Heterogeneous Nuclear Ribonucleoprotein Group M, Heterogeneous Nuclear Ribonucleoprotein M, Ribonucleoprotein M, Heterogeneous-Nuclear
Synonyms : Heterogeneous Nuclear Ribonucleoprotein Particle K Protein, dC-Stretch-Binding Protein, hnRNP K, hnRNP K Protein, Heterogeneous Nuclear Ribonucleoprotein K, Ribonucleoprotein K, Heterogeneous-Nuclear, dC Stretch Binding Protein
| heterocyclic compound |
a compound containing a heterocyclic ring
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| heterogeneous |
consisting of elements that are not of the same kind or nature; "the population of the United States is vast and heterogeneous" heterogenous: originating outside the body
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| heterocyclic ring |
a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon
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| heterosporous |
characterized by heterospory
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| heterotaxy |
transposition: any abnormal position of the organs of the body
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| HETE | originating outside the body |
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| HETE | consisting of elements that are not of the same kind or nature |
| HETE | tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species |
| HETE | all the yellow-green algae having flagella of unequal length |
| HETE | algae having chlorophyll a and usually c, and flagella of unequal lengths |
| HETE | (biology) not corresponding in structure or evolutionary origin |
| HETE | (biology) not corresponding in structure or evolutionary origin |
| HETE | derived from organisms of a different but related species |
| HETE | (biology) not corresponding in structure or evolutionary origin |
| HETE | 1 species: toyon |
| HETE | ornamental evergreen treelike shrub of United States Pacific coast having large white flowers and red berrylike fruits |
| HETE | (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage |