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 ultrastructure of postmeiotic eupyrene spermiogenesis of Helicoverpa assulta males, emphasing the structural differentiation of mitochondrial derivatives (MDs). As spermatids begin to elongate, nebenkern become divided into two unequal sized MDs. As spermiogenesis progresses, MDs go through dynamic structural differentiation and elongate along most of the length of the spermatid. They are spiral in shape, and run parallel to the axial filament. The manchette is formed around the MDs and cristae exist in the matrix of MDs. Reticular appendage becomes visible on the plasma membrane whereas most of the cytoplasm disappears. Mature sperm consist of electron-dense MDs, reticular appendage, lacinate appendages, and have the 9 + 9 + 2 pattern of microtubules in axial filament. Accessory tubules of axial filament have a high electron density. The manchette and cristae are no longer apparent. Sperm that exist in the vas deferens, after being released from testis, lack lacinate appendages but do retain the reticular appendage, and they acquire a thick crescent shaped coat.
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