Journal of ultrastructure and molecular structure research最新文献_第2页

Journal of ultrastructure and molecular structure research Pub Date : 1989-12-01 DOI: 10.1016/0889-1605(89)90024-4

引用次数: 0

Cellular polarity in cultured animal pole cells of Xenopus embryos 爪蟾胚胎培养动物极细胞的细胞极性

Journal of ultrastructure and molecular structure research Pub Date : 1989-12-01 DOI: 10.1016/0889-1605(89)90021-9

Mari Asada-Kubota

引用次数: 0

Abstract from the forty-first annual meeting of the Scandinavian Society for Electron Microscopy June 4–7, 1989, Uppsala, Sweden 斯堪的纳维亚电子显微镜学会第四十一届年会摘要1989年6月4日至7日，瑞典乌普萨拉

Journal of ultrastructure and molecular structure research Pub Date : 1989-12-01 DOI: 10.1016/0889-1605(89)90023-2

引用次数: 0

Different aspects of tubulin polymerization in spermatids of cyprinodontidae (fish, teleost) 鲤科(鱼类、硬骨鱼)精细胞中微管蛋白聚合的不同方面

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90049-9

Omar Thiom Thiaw, Xavier Mattei

{"title":"Different aspects of tubulin polymerization in spermatids of cyprinodontidae (fish, teleost)","authors":"Omar Thiom Thiaw, Xavier Mattei","doi":"10.1016/0889-1605(89)90049-9","DOIUrl":"10.1016/0889-1605(89)90049-9","url":null,"abstract":"<div><p>Our study concerns 10 genera and 26 species of cyprinodontid fish. In the cytoplasm of spermatids tubulin polymerizes in various forms according to species. We have demonstrated the presence of classic microtubules with a diameter of 24 nm and also of tubules of smaller diameter (15 run) and greater diameter (30 to 50 nm). Microtubules are very numerous in the cytoplasm of certain species. They may be arranged without any order or form bundles which may contain several hundred parallel elements. They never form a manchette. In two species (<em>Aplocheilichthys normani</em> and <em>Epiplatys fasciolatus</em>) only spermatids that degenerate show this peculiarity. The microtubules present two kinds of decorations. The first type are small elements composed of MAP which enable two or more microtubules to link up. The second type are curved tubulin elements that give the microtubule that bear them the appearance of an incomplete doublet. Doublets and triplets may also be formed. Cyprinodontidae spermatocytes and spermatids probably synthesize a very large quantity of tubulin which polymerizes in certain species.</p></div>","PeriodicalId":77743,"journal":{"name":"Journal of ultrastructure and molecular structure research","volume":"102 2","pages":"Pages 122-131"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0889-1605(89)90049-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53919314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Le spermatozoïde de Ophidion sp. (poisson, téléostéen) : particularités ultrastructurales du flagelle 蛇尾鱼(鱼，硬骨鱼)的精子:鞭毛的超微结构特征

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90053-0

X. Mattei, D. Thiam, O. T. Thiaw

引用次数: 7

Le spermatozoide de Ophidion sp. (Poisson, téléostéen): Particularités ultrastructurales du flagelle Ophidion sp.（鱼、硬骨）的精子：鞭毛的超微结构特征

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90053-0

Xavier Mattei , Djiby Thiam , Omar Thiom Thiaw

{"title":"Le spermatozoide de Ophidion sp. (Poisson, téléostéen): Particularités ultrastructurales du flagelle","authors":"Xavier Mattei , Djiby Thiam , Omar Thiom Thiaw","doi":"10.1016/0889-1605(89)90053-0","DOIUrl":"https://doi.org/10.1016/0889-1605(89)90053-0","url":null,"abstract":"<div><p>The spermatozoon of <em>Ophidion</em> sp. possesses an elongated nucleus 8 μm long, a short midpiece (0,6 μm), and a long flagellum (100 μm). The flagellar membrane extends in the form of two diametrically opposed sidefins. Evolving spermatids and spermatozoa are found in the lumen of the seminiferous tubes. The sections of flagella show filamentary and tubular elements disposed parallel to the axoneme microtubules. We have divided the flagella into three types. In type 1 the tip of the sidefins contains 20 to 30 filaments 5 run in diameter and between these and the axoneme 20 to 30 tubular elements 15 to 20 nm in diameter. Type 2 possesses a dense cytoplasm and a few tubular elements 10 nm in diameter disposed at the tip of the sidefins. Type 3 contains a cytoplasm which is not dense and in which we found polysaccharides and 1 to 8 tubular elements forming a palisade which lines the plasma membrane at the tip of the sidefins. We interpret these three types as three successive stages in the organization of the flagellum during spermiogenesis. Type 3 corresponds to the spermatic flagellum. These 10-nm-diameter tubules do not have the same chemical composition as the microtubules. Elements of the cytoskeleton serve as a support for the sidefins.</p></div>","PeriodicalId":77743,"journal":{"name":"Journal of ultrastructure and molecular structure research","volume":"102 2","pages":"Pages 162-169"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0889-1605(89)90053-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72241847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The head cartilage of cephalopods II. Ultrastructure of isolated native collagen fibrils and of polymeric aggregates obtained in Vitro: Comparison with the cartilage of mammals 头足类动物的头部软骨。体外分离的天然胶原原纤维和聚合聚集体的超微结构:与哺乳动物软骨的比较

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90050-5

Aurelio Bairati, Federica Cheli, Antonella Oggioni, Laura Vitellaro-Zuccarello

引用次数: 12

Organization of the nuclear pore complex in Saccharomyces cerevisiae 酿酒酵母核孔复合物的组织结构

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90047-5

Jerry Lynn Allen, Michael G. Douglas

引用次数: 46

Three-dimensional structure of the surface protein layer (MW layer) of Bacillus brevis 47 短芽孢杆菌表面蛋白层(MW层)的三维结构

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90055-4

Akio Tsuboi , Harald Engelhardt , Ute Santarius , Norihiro Tsukagoshi , Shigezo Udaka , Wolfgang Baumeister

{"title":"Three-dimensional structure of the surface protein layer (MW layer) of Bacillus brevis 47","authors":"Akio Tsuboi , Harald Engelhardt , Ute Santarius , Norihiro Tsukagoshi , Shigezo Udaka , Wolfgang Baumeister","doi":"10.1016/0889-1605(89)90055-4","DOIUrl":"10.1016/0889-1605(89)90055-4","url":null,"abstract":"<div><p>The three-dimensional (3D) structure of one surface protein layer from <em>Bacillus brevis</em> 47, the middle wall (MW) layer, has been reconstructed from tilted-view electron micrographs after correlation averaging to a resolution of 2 nm. The MW layer has p6 symmetry with a center-to-center spacing of 18.3 nm and a minimum thickness of 5.5 nm. The reconstruction reveals a distinct domain structure: the heavier domain of six monomers jointly forms a massive core centered at the sixfold symmetry axis, and lighter domains interconnect adjacent unit cells. In addition, the larger domains collectively form a pore by making contact with each other towards the inner surface, while the smaller domains establish a second connectivity towards the outer surface of the S layer. The MW layer of <em>B. brevis</em> resembles the S layer of <em>Acetogenium kivui</em> in various aspects: they have very similar lattice parameters and highly reminiscent 3D structures; the pores penetrate through the whole core and appear to determine the porosity of the S layers.</p></div>","PeriodicalId":77743,"journal":{"name":"Journal of ultrastructure and molecular structure research","volume":"102 2","pages":"Pages 178-187"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0889-1605(89)90055-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13778377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Structural and material design of mature mineralized radula teeth of Patella vulgata (gastropoda) 外翻髌骨(腹足动物)成熟矿化齿的结构与材料设计

Journal of ultrastructure and molecular structure research Pub Date : 1989-08-01 DOI: 10.1016/0889-1605(89)90052-9

Paul van der Wal

引用次数: 55