| homogametic sex | <genetics> The gender which has two copies of the same sex chromosome. For example: In humans, the female is homogametic because she is XX (has two copies of the X chromosome). In birds, the male is homogametic because he is ZZ (has two copies of the Z chromosome). Compare: heterogametic sex. (09 Oct 1997) |
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| homogamous | <botany> Having flowers of only one kind. Compare: heterogamous. (09 Oct 1997) |
| homogamy | <botany> The condition in a flowering plant species of having only one type of flower - one which produces both male and female parts in the same flower. Compare: heterogamy. (11 Jan 1998) |
| homogangliate | <zoology> Having the ganglia of the nervous system symmetrically arranged, as in certain invertebrates; opposed to heterogangliate. Origin: Homo- + gangliate. Source: Websters Dictionary (01 Mar 1998) |
| homogenate | A chaotic slurry of tissues and cells which results when cell-tissue structure has been mechanically disrupted (as opposed to by chemical means). (09 Oct 1997) |
| homogeneous | Consisting of or composed of similar elements or ingredients, of a uniform quality throughout. Origin: Gr. Genos = kind (18 Nov 1997) |
| homogeneous catalysis | <chemistry> A form of catalysis in which the catalyst is in the same physical state than the reactants, for example reactants and catalyst are all gases. (09 Jan 1998) |
| homogeneous immersion | In immersion microscopy, use of a fluid, such as oil, that has a refractive index virtually identical to that of glass, providing the highest possible numerical aperture. (05 Mar 2000) |
| homogeneous immersion objective | <microscopy> An objective to be immersed in a liquid of a certain refractive index and dispersion value as specified by the manufacturer of the objective. An oil-immersion objective, the most important type, is intended to be immersed in cedarwood oil (nD = 1.515) or in its manmade optical equivalent. A water-immersion objective is for dipping into an aqueous specimen mount. Alpha-monobromonaphthalene has such a high refractive index (nD = 1.66) that a very highly resolving objective (1.60 numerical aperture) was designed to be immersed in that liquid, for use by reflected light on metals and other opaque objects. (05 Aug 1998) |
| homogeneous radiation | Radiation consisting of a narrow band of frequencies, the same energy, or a single type of particle. (05 Mar 2000) |
| homogeneous system | In chemistry, a system whose parts cannot be mechanically separated, and is therefore uniform throughout and possesses in every part identically physical properties; e.g., a solution of sodium chloride in water. (05 Mar 2000) |
| homogeneously staining region | <molecular biology> A region on a chromosome which, when stained, is uniform in appearance. (Normally, a stained chromosome shows a banding pattern.) Homogeneously staining regions contain multiple copies of a single gene. (09 Oct 1997) |
| homogenesis | Reproduction by the same process in succeeding generations. Homogenesis is in contrast to alternation of generations, which occurs for example in all plants. Humans are an example of homogenetic reproduction. (09 Oct 1997) |
| homogenetic | <biology> Homogenous; applied to that class of homologies which arise from similarity of structure, and which are taken as evidences of common ancestry. Source: Websters Dictionary (01 Mar 1998) |
| homogenise | To make homogeneous. (05 Mar 2000) |