Showing papers in "Journal of Ultrastructure Research in 1970"

TL;DR: The connection of the fenestrated lining to a certain type of cell present in the sinusoidal lining can be used to identify this cell as an endothelial cell, a new contribution to the morphological distinction between endothelial and Kupffer cells.

TL;DR: Alcian blue appears to bind nonspecifically to anionic sites in cell coat mucosubstances, with the formation of a rather insoluble, osmiophilic dye-mucosUBstance complex.

TL;DR: The perforatorium, which does not undergo any significantly visible changes at the time of sperm passage through the egg investments, appears to function as a mechanical tool whereby the spermatozoon cuts through the material of the zona pellucida.

TL;DR: Hamster eggs, freed from cumulus cells and zona pellucida, were inseminated with capacitated and uncapacitated spermatozoa and the occurrence of physiological changes in that region of the spermatozoon at the time of sperm capacitation is suggested.

TL;DR: From physical and chemical studies of radiation, it is found that under the conditions of routine electron microscopy massive amounts of energy are absorbed by the specimen and the specimen appears to alter and then assume a steady state at which it can dissipate incoming energy nondestructively.

TL;DR: Aggregates rich in DPNH and TPNH tetrazolium reductase activity appeared only in type II muscle fibers of some humans with mild or no clinical neuromuscular disease and were thought to be massive proliferations of the longitudinal component and/or lateral sacs of SR.

TL;DR: Comparative studies show that no marked differences exist in the structural data of the nuclear envelope among the investigated amphibians and the significance of the structural components is discussed.

TL;DR: The gradion hypothesis applied to other microtubules and movement systems allows new conceptual approaches to phenomena such as the variable stability, functional variability, intraspecies and interspecies variation, and formation and regulation of microtubule arrays.

TL;DR: The results indicate that oncotically active substances should be included in aldehyde fixatives used for perfusion, in particular when structures or cellular relationships in labile extravascular spaces are studied.

TL;DR: Different stages of oogenesis of the Alpine newt were compared with respect to the nuclear envelope structure, employing negative staining and sectional work: larval eggs, early and later lampbrush stages, and mature eggs.

TL;DR: The fine structure of rabbit spermatozoa has been studied using the freeze-etching technique and the postnuclear sheath is revealed as a complex structure consisting of a matrix material ornamented by irregular depressions, basally located cords of oriented particles, and a terminal belt-like structure.

TL;DR: Two types of nerve terminals were distinguished on the basis of a statistically demonstrable difference in size and shape of the synaptic vesicles in pairs of adjacent endings.

TL;DR: The presence of acid phosphatase activity, as demonstrated by electron microscopic histochemistry, in cytoplasmic dense bodies and matrix vesicles type I strongly suggests that these structures are lysosomes.

TL;DR: It is concluded that a marginal bundle of microtubules cannot be considered a main factor responsible for maintenance of cell shape in all cell types where such a structure is found.

TL;DR: Granular and cornified cells from interpapillary areas of rat tongue epithelium was studied by electron microscopy after glutaraldehyde or glutaraldeosmium fixation and keratohyalin granules were observed in granular cells.

TL;DR: In this article, the authors examined the fine structure of the different components involved in the process of glomerular filtration and found that the inner and outer layers of the basement membrane, indicating a fairly loose gel structure.

TL;DR: It was shown that the egg surface in the region of the single and the double stripe is greatly enlarged by surface protrusions, which are thought to represent the mobilization of cytoplasmic pools, giving rise to the appearance of multivesicular bodies and dense bodies.

TL;DR: The present fine structural investigation describes nuclear inclusions in thirteen species of plants representing ferns, a gymnosperm, and angiosperms, where most of the inclusions are proteinaceous, although spherosome-like bodies presumably consisting of lipid have been observed also.

TL;DR: The observations suggest that these apparent specialized forms of primary lysosomes move toward the apex of the cells and release their contents into the alveolar lumen by way of membrane fusion, without participating in intracellular auto- or heterophagic digestive events.

TL;DR: The area of contact between the tubular and vascular components of the juxtaglomerular apparatus has been investigated by means of serial section electron microscopy and three-dimensional reconstruction as discussed by the authors.

TL;DR: The shell glands of the brine shrimp Artemia are composed of clusters of shell gland units, each unit usually consists of two rather oblong cells separated by a lumen, which communicates with the uterus by a duct.

TL;DR: Breakdown of the germinal vesicle in inseminated eggs of the surf clam, Spisula solidissima, consists of a vesiculation of its nuclear envelope and the condensation of its chromatin.

TL;DR: The data suggest that the major route of transport of water-soluble macromolecules across lacteals of the intestinal mucosa is vesicular rather than through endothelial cell junctions.

TL;DR: It is probable that at the molecular level the terminal web is formed by elongated branching elements that endows the apex with mechanical stability and anchors it to the body of the cell.

TL;DR: A model describing the molecular structure of mitochondrial membranes was designed, which pays due attention to the fact that a large number of enzymes and electron carrier molecules are basic components of the membranes.

TL;DR: Evidence is presented that indicates the material absorbing at 235 nm in commercial glutaraldehyde is a dimer of glutarhyde having the form of an α, β-unsaturated aldehyde, which should be protected from exposure to volatile acids or bases and stored in dilute solution or at subfreezing temperatures.

TL;DR: The study reports on the formation and enzymatic activity of keratinosomes and the intercellular material derived from them in the keratinizing epithelium of mouse tongue filiform papillae, providing information that keratinOSomes arise from the Golgi membrane system and that they carry acid phosphatase in their path of “secretion” from the golgi into the extracellular space.

TL;DR: This study demonstrates, at a fine structural level, the sites of this endogenase peroxidase enzyme in rat submaxillary glands, and the relationship of these findings to the possible role that this extracellular peroxIDase functions to control the growth of cariogenic bacteria is discussed.

TL;DR: The free nerve endings in the infrared receptor organ of an oriental pit viper were studied with the electron microscope and the structural relation between the Schwann cells and the branchlets seems functional, i.e., to provide the necessary nutrition for the cells without obstructing the reception of radiated energy over all the surface of the nerve mass.

TL;DR: The intermediate filaments remained after disruption of the thickFilaments, thin filaments, and Z bands, demonstrating that the intermediate Filaments cannot be equated with adult myofibrillar constituents, unless major modification of the intermediatefilaments occurs preceding sarcomere deposition.