caa a22 4500 469081619 CHVBK 20180323132951.0 cr unu---uuuuu 170328e19920401xx s 000 0 eng 10.1007/BF00338064 doi (NATIONALLICENCE)springer-10.1007/BF00338064 Motzko Dietmar Lehrstuhl für Zellmorphologie, Ruhr-Universität Bochum, Postfach 1021 48, W-4630, Bochum, Federal Republic of Germany aut Membranes and calcium sequestration during spermiogenesis in the cotton seed bug ( Dysdercus intermedius [Elektronische Daten] Heteroptera) [Dietmar Motzko] Summary: By use of osmium ferricyanide (OsFeCN) staining the fate of cytoplasmic membranes was followed during spermiogenesis in the cotton seed bug (Dysdercus intermedius). During early spermiogenesis interzonal lamellae of endoplasmic reticulum become aggregated as a stack of membranes traversing the entire cell body from the nucleus to the cytoplasmic bridge connecting neighbouring spermatids. Cisternae of endoplasmic reticulum ensheath the acroblast from which vesicles of different sizes are pinched off into the cytoplasm. The oxalate method was used to show that acroblast and associated vesicles are calcium-sequestering sites in spermatids. Membrane profiles with dense calcium oxalate precipitate derived from the acroblast form an uninterrupted membranous sheath at the apical side of the nucleus where the proacrosome will be attached. With further development of the spermatids, the vesicles derived from the acroblast also participate in forming a calciumsequestering sheath enveloping the axoneme and the mitochondrial "nebenkern” derivatives. Springer-Verlag, 1992 Calcium sequestration nationallicence Membranes nationallicence Spermiogenesis nationallicence Dysdercus intermedius (Insecta) nationallicence Cell and Tissue Research Springer-Verlag 268/1(1992-04-01), 149-155 0302-766X 268:1<149 1992 268 441 https://doi.org/10.1007/BF00338064 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00338064 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Motzko Dietmar Lehrstuhl für Zellmorphologie, Ruhr-Universität Bochum, Postfach 1021 48, W-4630, Bochum, Federal Republic of Germany aut NATIONALLICENCE 773 0- Cell and Tissue Research Springer-Verlag 268/1(1992-04-01), 149-155 0302-766X 268:1<149 1992 268 441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer