“yolk”的意思、由来-百科全书

yolk

embryology

also called Deutoplasm,

the nutritive material of an egg, used as food by a developing, embryonic animal. Eggs with relatively little, uniformly distributed yolk are termed isolecithal. This condition occurs in invertebrates and in all but the lowest mammals. Eggs with abundant yolk concentrated in one hemisphere of the egg are termed telolecithal. This occurs in many invertebrates and in all vertebrates lower than marsupial mammals. In arthropods, the yolk is massed near the centre of the egg; such eggs are termed centrolecithal.

词条	yolk
释义	yolk embryology also called Deutoplasm, the nutritive material of an egg, used as food by a developing, embryonic animal. Eggs with relatively little, uniformly distributed yolk are termed isolecithal. This condition occurs in invertebrates and in all but the lowest mammals. Eggs with abundant yolk concentrated in one hemisphere of the egg are termed telolecithal. This occurs in many invertebrates and in all vertebrates lower than marsupial mammals. In arthropods, the yolk is massed near the centre of the egg; such eggs are termed centrolecithal.
随便看	Afro-Asiatic lexical correspondences Afro-Asiatic root-and-pattern system Afrocentrism Afrīdī Aftenposten afterburner After Dark afterimage afterpiece afterripening Aftonian Interglacial Stage Afulaʿ Afwerki, Isaias Afyonkarahisar Afṭasid dynasty aga Agadez Agadir Agadir Incident Agaie Agaja Aga Khan I Aga Khan II Aga Khan III Aga Khan IV