Cytobiologie最新文献_第6页

[Effects of phalloidin in liver cells: binding, morphological changes, and elimination (author's transl)]. [phalloidin在肝细胞中的作用:结合、形态改变和消除[作者译]。

Cytobiologie Pub Date : 1978-06-01

H Schimassek, D Jeckel

引用次数: 0

Electronmicroscopical and electrophysiological investigations on polyethylene glycol induced cell fusion. 聚乙二醇诱导细胞融合的电镜和电生理研究。

Cytobiologie Pub Date : 1978-06-01

H Krähling, U Schinkewitz, A Barker, D F Hülser

引用次数: 0

Biological horizons in molecular microscopy. 分子显微镜中的生物学视界。

Cytobiologie Pub Date : 1978-06-01

W Baumeister

{"title":"Biological horizons in molecular microscopy.","authors":"W Baumeister","doi":"","DOIUrl":"","url":null,"abstract":"The purpose envisaged in this report is not to provide a comprehensive monography but rather to give a survey, especially for biologists, of the state of the art and of current research trends in molecular microscopy. Following a brief discussion of the obvious discrepancy between instrumental capabilities and the limits of biologically significant information, a definition of the diversifying field is attempted. Four main topics are discussed. First, recent progress in the field of \"low noise\" specimen supports is reviewed. It is emphasized that a minimum background structure is an important but not the sole criterion for a satisfactory support. It is the ability to adsorb molecules in a predeterminable and orderly fashion which will attract wider attention in the future; positional and orientational order figure as crucial points in the strategem of low dose microscopy. Second, the problem of achieving adequate contrast without the expense of an unfaithful representation of molecular structures is discussed. Contrast is a problem of optimum imaging modes as well as of preparatory techniques. The third topic of discussion is specimen dehydration. Several avenues to circumvent or at least to alleviate dehydration artifacts are outlined. The last chapter focusses on the most fundamental problem in molecular microscopy:radiation damage. A brief synopsis of the physical and physico-chemical processes involved in damaging interactions is given and an attempt is made to tesselate the true picture of radiation damage to lipids and proteins. This might serve as a guidance in assessing the degree of structural fidelity to be expected for a given electron dose. Possibilities to overcome the radiation damage problem are adumbrated.","PeriodicalId":75770,"journal":{"name":"Cytobiologie","volume":"17 1","pages":"246-97"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11301392","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: 0

The structure of a periodic cell wall component (HPI-layer of Micrococcus radiodurans). 周期性细胞壁成分的结构(耐辐射微球菌的hpi层)。

Cytobiologie Pub Date : 1978-06-01

O Kübler, W Baumeister

引用次数: 0

Ultrastructure of the frontal cap of monotactic forms of Amoeba proteus. 变形变形虫单致形态额帽的超微结构。

Cytobiologie Pub Date : 1978-06-01

B Hrebenda, L Grebecka

引用次数: 0

Differential growth of sister nuclei in binucleate microspores of Tradescantia paludosa. 双核小孢子姐妹核的差异生长。

Cytobiologie Pub Date : 1978-06-01

R L White, D Davidson

引用次数: 0

Architecture and cell structures in the distal nephron of the rat kidney. 大鼠肾远端肾元的结构和细胞结构。

Cytobiologie Pub Date : 1978-06-01

M L Crayen, W Thoenes

{"title":"Architecture and cell structures in the distal nephron of the rat kidney.","authors":"M L Crayen, W Thoenes","doi":"","DOIUrl":"","url":null,"abstract":"Using semi-thin sections of marked tubules of the rat kidney, the distal part of the nephron is represented in toto for the first time and reconstructed in its course from the thick part of HENLE's loop to its junction with another collecting tubule. The shape of the model accords well with observations in vivo. On the basis of observations with light and electron microscopy, four types of cells are differentiated: Type 1 (Mittelstück) cell; type 2 (intermediate) cell; type 3 (light) cell and type 4 (intercalated) cell. According to the distribution of these different types of cells, the distal nephron is divided in the following way: Pars recta and pars convoluta of the distal nephron consist of type 1 (Mittelstück) cells; pars arcuata and pars recta of the cortical collecting duct exhibit type 3 (light) and type 4 (intercalated) cells; in the connecting portion of the distal tubule all four types are represented, type 2 (intermediate) and type 4 (intercalated) being the most frequent. The demarcation of the connecting portion according to our definition points to a dynamic relationship of the cell structures of the distal nephron, which gains clarity when conditions are experimentally varied. Hence the question for a morphological proof of where exactly the two nephrogenic blastemata join gives place to the more important question of what these cell structures and their variability mean as signs of functional adaptation-reactions.--The existence of the connecting portion, contested until now, is affirmed; a cytological characterization of it is given and a definition is recommended.","PeriodicalId":75770,"journal":{"name":"Cytobiologie","volume":"17 1","pages":"197-211"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11890421","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: 0

A model for microtubular rigidity. 微管刚度模型。

Cytobiologie Pub Date : 1978-06-01

J Bereiter-Hahn

引用次数: 0

Studies on nucleoli of pigeon erythroid cells. 鸽子红系细胞核仁的研究。

Cytobiologie Pub Date : 1978-06-01

K Smetana, Z Likovsky

{"title":"Studies on nucleoli of pigeon erythroid cells.","authors":"K Smetana, Z Likovsky","doi":"","DOIUrl":"","url":null,"abstract":"In order to provide more information on nucleolar changes occurring during cell differentiation and maturation, pigeon erythroid cells have been studied by means of a simple light microscopic cytochemical procedure for the demonstration of the RNA containing structures and with conventional transmission electron microscopy. Nucleoli with more or less distinct nucleolonemata present in early erythroblasts were replaced by ring-shaped nucleoli and, finally, by micronucleoli in more mature erythroid cells. In contrast to the previously studied chick embryos, chickens and hens which possess micronucleoli in almost all mature erythrocytes, mature pigeon erythrocytes are mostly without any nucleoli. The ultrastructural organization of nucleoli with more or less distinct nucleolonemata and ring-shaped nucleoli do not show differences, in comparison with such forms of nucleoli in other cells. Micronucleoli in pigeon erythroblasts are characterized by degranulation, suggesting the inhibition of the formation of the nucleolar granular components. Some nucleoli show a segregation of the nucleolar components, indicating the inactivation of the nucleolar RNA polymerase, and occasionally chromatin retraction from the nucleolar body, suggesting the loss of the template. In mature erythrocytes, micronucleoli consist mainly of fibrillar components, and the perinucleolar chromatin is partially retracted from the nucleolar body of such nucleoli.","PeriodicalId":75770,"journal":{"name":"Cytobiologie","volume":"17 1","pages":"146-58"},"PeriodicalIF":0.0,"publicationDate":"1978-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11890418","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: 0

[Ultrastructural organization of the ocelloide of Nematodinium. Phylogenetic aspect of the evolution of Warnowiidae Lindemann dinoflagellates photoreceptor (author's transl)]. 线虫卵壳的超微结构组织。林德曼甲藻(Lindemann dinoflagellates)光感受器进化的系统发育方面[作者简介]。

Cytobiologie Pub Date : 1978-06-01

C Greuet

引用次数: 0