| ectohormone | A parahormonal chemical mediator of ecological significance which is secreted, largely by an organism (usually an invertebrate) into its immediate environment (air or water); it can alter the behaviour or functional activity of a second organism, often of the same species as that secreting the ectohormone. See: ecological ectocrine. (05 Mar 2000) |
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| ectoine synthase | <enzyme> Catalyses cyclic condensation of n(gamma)-l-2,4-diaminobutyric acid to yield l-ectoine Registry number: EC 4.2.1.- Synonym: ectc gene product (26 Jun 1999) |
| ectolecithal | <biology> Having the food yolk, at the commencement of segmentation, in a peripheral position, and the cleavage process confined to the center of the egg; as, ectolecithal ova. Origin: Ecto- + Gr. The yolk of an egg. Source: Websters Dictionary (01 Mar 1998) |
| ectomere | A blastomere (one of the cells formed during the first few divisions of the zygote) which takes part in forming the ectoderm (the outermost tissue layer of an embryo). (09 Oct 1997) |
| ectomerogony | The production of merozoites in the asexual reproduction of sporozoan parasites at the surface of schizonts and of blastophores, or by infolding into the schizont, as contrasted with endomerogony; ectomerogony has been observed in various species of Eimeria. Origin: ecto-+ G. Meros, part, + gone, generation (05 Mar 2000) |
| ectomesenchyme | Synonym: mesectoderm. Origin: ecto-+ G. Mesos, middle, + enkyma, infusion (05 Mar 2000) |
| ectomorph | A constitutional body type or build (biotype or somatotype) in which tissues originating from the ectoderm predominate; from a morphological standpoint, the limbs predominate over the trunk. Synonym: longitype. Origin: ecto-+ G. Morphe, form (05 Mar 2000) |
| ectomorphic | Relating to, or having the characteristics of, an ectomorph. (05 Mar 2000) |
| ectonucleotide pyrophosphohydrolase | <enzyme> Associated with porcine chondrocyte-derived vesicles; mw 127 kD; amino acid sequence has been determined Registry number: EC 3.6.1.- Synonym: ectontpphase (26 Jun 1999) |
| ectopagus | Conjoined twins in which the bodies are joined laterally. See: conjoined twins. Origin: ecto-+ G. Pagos, something fixed (05 Mar 2000) |
| ectoparasite | A parasite that lives on the outside of its host rather than within the host's body. Fleas and lice are examples. (09 Oct 1997) |
| ectoparasitic infestations | Infestations by parasites which live on the outside of the body of the host. (12 Dec 1998) |
| ectoparasiticide | An agent that is applied directly to the host to kill ectoparasites. Origin: ectoparasite + L. Caedo, to kill (05 Mar 2000) |
| ectoparasitism | Development on (rather than in) the body of a pathogenic agent, e.g., body lice. Synonym: ectoparasitism. (05 Mar 2000) |
| ectoperitonitis | Inflammation beginning in the deeper layer of the peritoneum which is next to the viscera or the abdominal wall. (05 Mar 2000) |
| ecology |
The scientific study of relationships between organisms and their environment. It is concerned with the life histories, distribution, and behavior of individual species as well as the structure and function of natural systems at the level of populations, communities, and ecosystems.
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| ecological |
The number of species at each trophic level and the number of trophic levels in a community.
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| ecological |
Bronfenbrenner's view of development, involving five environmental systems-microsystem, exosystem, ecosystem, macrosystem, and chronosystem. These emphasize the role of social contexts in development.
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| echo |
In radar, a general term for the appearance, on a radar display, of the radio signal scattered or reflected from a target. The characteristics of a radar echo are determined by 1) the waveform, frequency, and power of the incident wave; 2) the range and velocity of the target with respect to the radar; and 3) the size, shape, and composition of the target. See also target signal, blip.
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| ecosphere |
The atmosphere, oceans, biosphere (plant and animal life), and top portion of the earth's crust, which are involved in complex interactions defining ecology. Namely, this is the mutual relation between organisms and their environment over the spherical surface of the earth.
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