See contour feathers.参阅197页contour feathers。...[继续阅读]

    See B-cell.参阅81页B-cell。...[继续阅读]

    The form ofRNA that transfers the information necessaryfor protein synthesis from the DNA in the nu-cleus to the ribosomes in the cytoplasm. Onestrand of the double helix of DNA acts as atemplate along which complementary RNAnucleotides become aligned. Th...[继续阅读]

    The second most recent pe-riod of the Paleozoic era,some 355 - 280million years ago. It is characterized by theevolution on swampy land of amphibians,afew primitive early reptiles,and giant ferns.Aquatic life included sharks and coela-canths. The period i...[继续阅读]

    The increase in the reactionof an organism or cell to an antigen to whichit has been previously exposed.It may occurnaturally or be artificially induced,e.g. fol-lowing vaccination.生物或细胞对先前接触过的抗原表现出的反应敏感性的提高。它可自然发生或人工诱导,例如接...[继续阅读]

    See cnidoblast.参阅177页cnidoblast。...[继续阅读]

    Any of a class of intermediates pro-duced by the hydrolysis of starch.Furtherhydrolysis eventually produces the monosac-charide glucose .水解淀粉产生的一类中间体。进 一步水解最终产生单糖-葡萄糖。...[继续阅读]

    The formation of a pocket oftissue during embryonic development,espe-cially the intucking of the early gut (archen-teron).胚胎发育过程中袋状组织的形成,特别是早期肠(原肠)的向内凹陷。...[继续阅读]

    A plant-eating animal,especial-ly one of the herbivorous mammals,such ascows,rabbits,etc. There may be variousmodifications associated with this diet,e.g.to the teeth and digestive system.Comparecarnivore,omnivore.以植物为食的动物,尤其是草食哺乳动物,例如牛、兔等。这些动物与...[继续阅读]

    A hormone produced by the corpusluteum and responsible for the inhibition ofuterine contraction.During birth,relaxinstimulates dilation of the cervix and relaxesthe pubic symphysis enabling the pelvic gir-dle to widen.黄体分泌的一种可抑制子宫收缩的激素。分娩时,松弛素刺激子宫...[继续阅读]