Journal of ultrastructure research最新文献_第7页

Ultrastructure of the full-term shark yolk sac placenta 足月鲨鱼卵黄囊胎盘的超微结构

Journal of ultrastructure research Pub Date : 1985-06-01 DOI: 10.1016/S0022-5320(85)80013-7

William C. Hamlett , John P. Wourms , JoAn S. Hudson

{"title":"Ultrastructure of the full-term shark yolk sac placenta","authors":"William C. Hamlett , John P. Wourms , JoAn S. Hudson","doi":"10.1016/S0022-5320(85)80013-7","DOIUrl":"https://doi.org/10.1016/S0022-5320(85)80013-7","url":null,"abstract":"<div><p>During ontogeny, the yolk sac of some viviparous sharks differentiates into a yolk sac placenta that persists to term. The placenta is non-invasive and non-deciduate. Hematrophic transport is the major route of nutrient transfer from mother to fetus. The placental unit consists of: (1) an umbilical stalk; (2) the smooth, proximal portion of the placenta; (3) the distal, rugose portion; (4) the egg envelope; and (5) the maternal uterine tissues. Exchange of metabolites is effected through the intervening egg envelope. The distal rugose portion of the placenta is the fetal attachment site. It consists of: (1) surface epithelial cells; (2) a collagenous stroma with vitelline capillaries; and (3) an innermost boundary cell layer. The columnar surface epithelial cells are closely apposed to the inner surface of the egg envelope. Wide spaces occur between the lateral margins of adjacent cells. Surface epithelial cells contain an extensive apical canalicular-tubular system and many whorl-like inclusions in their basal cytoplasm. Capillaries of the vitelline circulation are closely situated to these cells. A well-developed collagenous stroma separates the surface epithelium from an innermost boundary cell layer. <em>In vitro</em> exposure of full-term placentae to solutions of trypan blue and horseradish peroxidase (HRP) reveals little uptake by the smooth portion of the placenta but rapid absorption by the surface epithelial cells of the distal, rugose portion. HRP enters these cells by an extensive apical system of smooth-walled membranous anastomosing canaliculi and tubules. Prominent whorl-like inclusions that occupy the basal cytoplasm of the surface cells, adjacent to the pinocytotically active endothelium of the vitelline capillaries, are hypothesized to be yolk proteins that are transferred from the mother to embryo throughout gestation.</p></div>","PeriodicalId":17593,"journal":{"name":"Journal of ultrastructure research","volume":"91 3","pages":"Pages 192-206"},"PeriodicalIF":0.0,"publicationDate":"1985-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0022-5320(85)80013-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72247188","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: 39

Effects of vinblastine and colchicine on the rat adrenal cortex: Morphometric and cytochemical studies 长春碱和秋水仙碱对大鼠肾上腺皮质的影响:形态计量学和细胞化学研究

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90066-7

Maria C. Magalha˜es, A. Bonito Vitor, M.M. Magalha˜es

{"title":"Effects of vinblastine and colchicine on the rat adrenal cortex: Morphometric and cytochemical studies","authors":"Maria C. Magalha˜es, A. Bonito Vitor, M.M. Magalha˜es","doi":"10.1016/0889-1605(85)90066-7","DOIUrl":"10.1016/0889-1605(85)90066-7","url":null,"abstract":"<div><p>The effects of administration of anti-microtubular drugs—vinblastine and colchicine—on the ultrastructure of the zona fasciculata cells of young rat adrenal were studied. Young male rats were injected with vinblastine and sacrificed 2 hr later or with colchicine and sacrificed 3 hr after drug administration. Animals injected with isotonic saline in same experimental conditions served as controls. Ultrastructural alterations provoked by both drugs, vinblastine or colchicine, were identical and were most prominent in the Golgi areas. They appeared enlarged and crowded with round, or slightly elongated light vesicles, acid phosphatase, and osmium negatives. The Golgi dictyosomes, although keeping their normal morphology, were less numerous and presented cisternae which were narrower and shorter than controls. Electron-dense vesicles, round or elongated, and acid phosphatase positive—lysosomes—were observed in great number in the Golgi areas, intermingled with light vesicles. The relative volume of light vesicles and lysosomes of the treated animals was significantly increased when compared with controls, but the relative volume of dictyosomes was significantly decreased. Also the numerical density of light vesicles and lysosomes of the injected rats was significantly increased when compared with controls. These alterations are highly suggestive of the Golgi involvement in the adrenal secretory process.</p></div>","PeriodicalId":17593,"journal":{"name":"Journal of ultrastructure research","volume":"91 2","pages":"Pages 149-158"},"PeriodicalIF":0.0,"publicationDate":"1985-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0889-1605(85)90066-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13566009","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: 8

Structural modifications in the extracellular investment ofNostoc commune Vauch. during the life cycle I. Motile and nonmotile normogonium, biseriate stage 植物胞外投资的结构改变。活动和非活动正原体，双生期

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90068-0

G. Bazzichelli, N. Abdelahad, Franco Ventola

引用次数: 11

Structural modifications in the extracellular investment ofNostoc commune Vauch. during the life cycle I. Motile and nonmotile normogonium, biseriate stage 诺托克公社Vauch细胞外投资的结构修饰。在生命周期中I.运动和非运动的正常性腺，双列期

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90068-0

Giorgio Bazzichelli , Nadia Abdelahad , Franco Ventola

引用次数: 11

Sputter shadowing improved by using a tungsten target 使用钨靶改善了溅射阴影

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90065-5

William R. Colquhoun, Lynne U. Cassimeris

引用次数: 1

Antikeratin antibody staining on ultrathin sections of epidermal cells prepared by low-denaturation embedding 低变性包埋法制备的表皮细胞超薄切片的抗角蛋白抗体染色

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90061-8

Kenneth D. Marenus

引用次数: 3

Distribution of filipin-sterol complexes in the myelinated nerve fiber 菲律宾甾醇复合物在有髓神经纤维中的分布

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90062-X

G. Allt , C.E. Blanchard , M.L. MacKenzie , K. Sikri

引用次数: 6

Centriole size modifications during the cell cycle of the amoebae of the myxomycetePhysarum polycephalum 黏菌多头绒泡菌变形虫细胞周期中中心粒大小的改变

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90064-3

C. Gely, M. Wright

引用次数: 11

Microtubules and macrotubules in fish meiosis 鱼类减数分裂中的微管和大管

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90060-6

Xavier Mattei, Raymond Romand, Omar Thiom Thiaw

引用次数: 7

Ultrastructural visualization of unfixed and unstained whole mounts by high-voltage electron microscopy at low temperatures 低温高压电镜观察未固定和未染色整片的超微结构

Journal of ultrastructure research Pub Date : 1985-05-01 DOI: 10.1016/0889-1605(85)90063-1

Mircea Fotino, Thomas H. Giddings

引用次数: 8