Immunological Survey of Planktonic Embryos and Larvae of the Starfish Asterina pectinifera, Obtained from the Sea, Using a Monoclonal Antibody Directed against Egg Polypeptides
نویسندگان
چکیده
منابع مشابه
Studies on dwarf larvae developed from isolated blastomeres of the starfish. Asterina pectinifera.
Not only a whole denuded egg, but also blastomeres isolated from 2-, 4- and 8-cell starfish embryos developed into morphologically normal, but dwarf bipinnariae, the sizes of which were roughly proportionate to that of the respective original blastomeres. Some of the blastomeres isolated from the 16-cell stage were also capable of developing into the larval stage. All isolated blastomeres divid...
متن کاملReconstruction of bipinnaria larvae from dissociated embryonic cells of the starfish, Asterina pectinifera.
Cells dissociated from swimming embryos of the starfish are able to reconstruct bipinnaria larvae. This process consists of reaggregation (stage 1), formation of the external epithelium (stage 2), development of the internal cavities which will eventually grow either into the blastocoel or the intestinal lumen (stage 3), gastrulation or fusion of the internal and the external epithelia (stage 4...
متن کاملthe survey of the virtual higher education in iran and the ways of its development and improvement
این پژوهش با هدف "بررسی وضعیت موجود آموزش عالی مجازی در ایران و راههای توسعه و ارتقای آن " و با روش توصیفی-تحلیلی و پیمایشی صورت پذیرفته است. بررسی اسنادو مدارک موجود در زمینه آموزش مجازی نشان داد تعداد دانشجویان و مقاطع تحصیلی و رشته محل های دوره های الکترونیکی چندان مطلوب نبوده و از نظر کیفی نیز وضعیت شاخص خدمات آموزشی اساتید و وضعیت شبکه اینترنت در محیط آموزش مجازی نامطلوب است.
What do dissociated embryonic cells of the starfish, Asterina pectinifera, do to reconstruct bipinnaria larvae?
The cellular events that take place during reconstruction of larval forms from dissociated embryonic cells of the starfish are investigated by thick and thin sections. Dissociated cells reaggregate, form an external epithelium (ectoderm), internal epithelial vesicles (endoderm), the blastocoel and the mesenchyme. The internal vesicles continue to fuse until there is only one large one suspended...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1991
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1542492