See contour feathers.參閱197頁contour feathers。...[繼續(xù)閱讀]

    See B-cell.參閱81頁B-cell。...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]

    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.生物或細(xì)胞對(duì)先前接觸過的抗原表現(xiàn)出的反應(yīng)敏感性的提高。它可自然發(fā)生或人工誘導(dǎo),例如接...[繼續(xù)閱讀]

    See cnidoblast.參閱177頁cnidoblast。...[繼續(xù)閱讀]

    Any of a class of intermediates pro-duced by the hydrolysis of starch.Furtherhydrolysis eventually produces the monosac-charide glucose .水解淀粉產(chǎn)生的一類中間體。進(jìn) 一步水解最終產(chǎn)生單糖-葡萄糖。...[繼續(xù)閱讀]

    The formation of a pocket oftissue during embryonic development,espe-cially the intucking of the early gut (archen-teron).胚胎發(fā)育過程中袋狀組織的形成,特別是早期腸(原腸)的向內(nèi)凹陷。...[繼續(xù)閱讀]

    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.以植物為食的動(dòng)物,尤其是草食哺乳動(dòng)物,例如牛、兔等。這些動(dòng)物與...[繼續(xù)閱讀]

    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.黃體分泌的一種可抑制子宮收縮的激素。分娩時(shí),松弛素刺激子宮...[繼續(xù)閱讀]