ELECTRON MICROSCOPIC STUDY OF THE PROTOPLASMIC CONTINUITY IN CERTAIN BROWN ALGAE

1966 ◽  
Vol 44 (1) ◽  
pp. 89-93 ◽  
Author(s):  
T. Bisalputra
Keyword(s):  
Endoplasmic Reticulum ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Brown Algae ◽  
Outer Cortex ◽  
Electron Microscopic ◽  
Fucus Evanescens

The protoplasmic continuity in the meristoderm and outer cortex of the blades of Egregia menziesii and Fucus evanescens is demonstrated by electron micros copy. Groups of small pores of the order of 37.5 mμ in diameter perforate the walls in these regions. Traversing the pores are protoplasmic strands connecting the adjacent protoplasts. It is concluded that these pores are plasmodesmata which occur in primary pit fields. Endoplasmic reticulum is not found within the plasmodesma.

scholarly journals Canine Cutaneous Histiocytoma A Light and Electron Microscopic Study

1970 ◽  
Vol 7 (1) ◽  
pp. 12-27 ◽  
Author(s):  
D. F. Kelly
Keyword(s):  
Electron Microscopy ◽  
Endoplasmic Reticulum ◽  
Plasma Membrane ◽  
Acid Phosphatase ◽  
Microscopic Study ◽  
Mononuclear Cell ◽  
Electron Microscopic Study ◽  
Light And Electron Microscopy ◽  
Perinuclear Region ◽  
Electron Microscopic

Cutaneous histiocytomas from 4 dogs were examined by light and electron microscopy. A large (up to 10 μ in diameter) mononuclear cell with prominent filiform processes of the plasma membrane predominated. Its cytoplasm contained relatively small amounts of endoplasmic reticulum and mitochondria, only occasional lysosomes, fibrils, most obvious in the perinuclear region, and small amounts of cytoplasmic debris. Acid phosphatase was not detected. Fibroblasts and collagen formed a small part of the lesion, except at the junction with surrounding dermis, where fibers were plentiful. The morphologic features of the lesion are compatible with the suggestion that the predominant cell is of histiocytic type.

scholarly journals Elektronenmikroskopische Untersuchung an intrazellulär lebenden Einzellern in Foraminiferen / Electron Microscopic Study on Intracellular Microorganisms in Foraminifera

1971 ◽  
Vol 26 (12) ◽  
pp. 1341-1344 ◽  
Author(s):  
Dieter Schwab
Keyword(s):  
Endoplasmic Reticulum ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Systematic Position ◽  
Basal Bodies ◽  
Starvation Period ◽  
Electron Microscopic ◽  
Multinucleated Cells ◽  
Cytoplasmic Vacuoles ◽  
Unicellular Organisms

In the cytoplasmic vacuoles and lacunas of the monothalamous foraminifera Myxotheca arenilega and Allogromia laticollaris unicellular organisms of about 2,5-6 µm appear, which persist intracellularly, showing no disintegration, even after a long starvation period of the host.The mono- or multinucleated cells show a well developed dense endoplasmic reticulum, a large number of ribosomes, elongated mitochondria of the tubulus type, a few Golgi - complexes and paired centrioles or basal bodies. The cells are surrounded by a sheath of about 0.1 μm, consisting of numerous lamellae in a loose arrangement together with osmiophilic substances. It is presumed that this protects the cells against digestion by the host. Since foraminifera which contain these organisms show no differences in growth and size at the end of their developing period compared to those cells which are free from these organisms, it is doubted that these organisms are parasites. They are also presumably not symbiontic organisms, since they possess no thylacoids. It is likely that they are harmless commensals. Their systematic position is unknown.

scholarly journals An Electron Microscopic Study of Experimentally-induced HEV Encephalitis

1978 ◽  
Vol 15 (1) ◽  
pp. 102-113 ◽  
Author(s):  
C. Meyvisch ◽  
J. Hoorens
Keyword(s):  
Endoplasmic Reticulum ◽  
Golgi Apparatus ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Mononuclear Cells ◽  
Brain Parenchyma ◽  
Electron Microscopic ◽  
Virus Particles ◽  
Encephalomyelitis Virus ◽  
The Brain

A gnobiotic piglet, was inoculated intracerebrally with hemagglutinating encephalomyelitis virus (strain VW572). Mononuclear cells formed vascular cuffs and were disseminated in the brain parenchyma. A few neurons were surrounded by the same kind of cells. Virus particles morphologically similar to Coronavirus particles were found in the cytoplasm of both chromatolytic light neurons and hyperchromic dark neurons. The particles were in vesicles of distended endoplasmic reticulum and in the hypertrophied Golgi apparatus.

The Growth of Herpesvirus mulatto in Human Fibroblast

1974 ◽  
Vol 32 ◽  
pp. 244-245
Author(s):  
Glennelle Washington ◽  
Philip P. McGrath ◽  
Peter R. Graze ◽  
Ivor Royston
Keyword(s):  
Rhesus Monkey ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Peripheral Blood ◽  
Human Fibroblast ◽  
Rhesus Monkeys ◽  
Human Fibroblasts ◽  
Electron Microscopic ◽  
Specific Antisera ◽  
Peripheral Blood Leucocytes

Herpes-like viruses were isolated from rhesus monkey peripheral blood leucocytes when co-cultivated with WI-38 cells. The virus was originally designated rhesus leucocyte-associated herpesvirus (LAHV) and subsequently called Herpesvirus mulatta (HVM). The original isolations were from juvenile rhesus monkeys shown to be free of antibody to rhesus cytomegalic virus. The virus could only be propagated in human or simian fibroblasts. Use of specific antisera developed from HVM showed no relationship between this virus and other herpesviruses. An electron microscopic study was undertaken to determine the morphology of Herpesvirus mulatta (HVM) in infected human fibroblasts.

Cell Wall Ultrastructure in Three Strains of a Cariogenic Streptococcus

1971 ◽  
Vol 29 ◽  
pp. 338-339
Author(s):  
M. J. Kramer ◽  
Alan L. Coykendall
Keyword(s):  
Cell Wall ◽  
Dental Caries ◽  
Streptococcus Mutans ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Genetic Heterogeneity ◽  
Morphological Characteristics ◽  
Electron Microscopic ◽  
Dna Reassociation ◽  
Wall Ultrastructure

During the almost 50 years since Streptococcus mutans was first suggested as a factor in the etiology of dental caries, a multitude of studies have confirmed the cariogenic potential of this organism. Streptococci have been isolated from human and animal caries on numerous occasions and, with few exceptions, they are not typable by the Lancefield technique but are relatively homogeneous in their biochemical reactions. An analysis of the guanine-cytosine (G-C) composition of the DNA from strains K-1-R, NCTC 10449, and FA-1 by one of us (ALC) revealed significant differences and DNA-DNA reassociation experiments indicated that genetic heterogeneity existed among the three strains. The present electron microscopic study had as its objective the elucidation of any distinguishing morphological characteristics which might further characterize the respective strains.

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