共查询到20条相似文献，搜索用时 15 毫秒
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Gerhard Schmidt 《Die Naturwissenschaften》1960,47(12):286-287
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Herbert Jäckle Ulrike Gaul Ulrich Nauber Nicole Gerwin Michael J. Pankratz Eveline Seifert Reinhard Schuh Detlef Weigel 《Die Naturwissenschaften》1989,76(11):512-517
Drosophila proved an excellent system to study molecular processes in establishing the body pattern of an embryo. Genes which are active during oogenesis provide localized cues which regulate a cascade of zygotic genes that determines the developmental fate of the blastoderm cells along the longitudinal axis of the embryo. 相似文献
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O. Kandler 《Die Naturwissenschaften》1979,66(2):95-105
None of the representatives of the four genera of methanogenic bacteria available in pure culture were found to contain the typical cell-wall polymer (murein, peptidoglycan) found in all other bacteria and cyanobacteria. However, each of the four genera contains different cell-wall polymers, indicating a very early divergence not only of the methanogens from all other procaryotes, but also of the various genera of the methanogens from one another. This assumption is compatible with the dendrogram of bacterial evolution derived from comparative cataloguing of the 16 S rRNS of bacteria. 相似文献
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