지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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We examined the ultrastucture of postmeiotic spermiogenesis in the testis of Helicoverpa assulta. Like other Lepidopterian species, tobacco bud worm produces two kinds of sperms-nucleated eupyrene and anucleated apyrene. We emphasized the structural differentiations of the eupyrene head. In elongating spermatids, acrosomes have a long projection and come close to the side of the nucleus. Chromatin scattered inside the nucleus is transformed into a granular structure and then becomes compactly condensed within the inner membrane. Cytoplasm progressively disappears and reticular appendages are attached on the outer membrane. In maturing sperm, acrosomes become very short in length and form narrow channels around the nucleus. An electron - dense nucleus, one centriole, extracellular material, and the ultrastructure of a 9+9+2 flagellum appears in each maturing sperm. Mature sperms are linked by cytoplasmic bridges to form a single clone and almost all of the cytoplasm disappears. In fully mature sperm, reticular and lacinate appendages show up whereas extracellular material disappears.
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