scholarly journals FINE STRUCTURE OF INTRACYTOPLASMIC MEMBRANE SYSTEM IN LISTERIA MONOCYTOGENES

1963 ◽  
Vol 9 (1) ◽  
pp. 1-13 ◽  
Author(s):  
TOMIO KAWATA
Keyword(s):  
Fine Structure ◽  
Listeria Monocytogenes ◽  
Membrane System ◽  
Intracytoplasmic Membrane

scholarly journals THE FINE STRUCTURE OF DIPLOCOCCUS PNEUMONIAE

1964 ◽  
Vol 22 (2) ◽  
pp. 453-467 ◽  
Author(s):  
Alexander Tomasz ◽  
James D. Jamieson ◽  
Elena Ottolenghi
Keyword(s):  
Plasma Membrane ◽  
Fine Structure ◽  
Membrane System ◽  
Striking Feature ◽  
Intracytoplasmic Membrane ◽  
Intracytoplasmic Membranes

The fine structure of an unencapsulated strain of Diplococcus pneumoniae is described. A striking feature of these bacteria is an intracytoplasmic membrane system which appears to be an extension of septa of dividing bacteria. The possible function of these structures and their relationship to the plasma membrane and other types of intracytoplasmic membranes found in pneumococcus is discussed.

scholarly journals THE FINE STRUCTURE OF STREPTOMYCES VIOLACEORUBER (S. COELICOLOR)

1961 ◽  
Vol 10 (4) ◽  
pp. 505-516 ◽  
Author(s):  
Audrey M. Glauert ◽  
David A. Hopwood
Keyword(s):  
Fine Structure ◽  
Aerial Mycelium ◽  
Membrane System ◽  
Cross Wall ◽  
Intracytoplasmic Membrane ◽  
Thin Sections ◽  
Gram Positive Bacteria ◽  
Outer Component ◽  
Streptomyces Violaceoruber ◽  
Germ Tubes

A study of thin sections of hyphae of Streptomyces violaceoruber in the electron microscope showed that the structure of the walls and the mode of formation of cross-walls are similar to those of Gram-positive bacteria. A beaded structure was seen in some regions of the wall, and the significance of this observation is discussed in relation to previous studies of the fine structure of bacterial cell walls. Elements of the intracytoplasmic membrane system appear to be involved in the process of cross-wall formation. The walls of the hyphae of the aerial mycelium divide into two layers before the spores are formed, and only the inner component of the wall grows inwards to form the cross-walls and so delimit the spores. The outer component remains intact for a time and acts as a sheath around the developing spores. Finally the sheath breaks and the spores are liberated. This process is contrasted with the formation of endospores in eubacteria. When the spores germinate, the walls of the germ tubes are continuous with those of the spores.

A Freeze-Etch Study of Acinetobacter SP. Grown on a Hydrocarbon Substrate

1974 ◽  
Vol 32 ◽  
pp. 174-175
Author(s):  
C. L. Scott ◽  
W. R. Finnerty
Keyword(s):  
Membrane System ◽  
Structural Distortion ◽  
Intracytoplasmic Membrane ◽  
Gram Negative ◽  
Sectioned Material ◽  
Acinetobacter Sp

Acinetobacter sp. HO-1-N, a gram-negative hydrocarbon oxidizing bacterium previously designated Micrococcus cerificans, has been shown to sequester the hydrocarbon into intracytoplasmic pools as a result of growth on this substrate. In hydrocarbon grown cells, an intracytoplasmic membrane system was also observed along with a doubling of cellular phospholipids (Z). However, using conventional dehydration and embedding procedures in preparing thin sectioned material, the hydrocarbon is extracted from the cells. This may lead to structural distortion, consequently, the freeze-etch technique was applied to preserve the integrity of the cell.

Methanogenesis in the absence of intracytoplasmic membranes

1984 ◽  
Vol 30 (5) ◽  
pp. 594-604 ◽  
Author(s):  
G. D. Sprott ◽  
L. C. Sowden ◽  
J. R. Colvin ◽  
K. F. Jarrell ◽  
T. J. Beveridge
Keyword(s):  
Membrane System ◽  
Accurate Method ◽  
Methanobacterium Thermoautotrophicum ◽  
Methane Formation ◽  
Bacterial Cells ◽  
Optimal Temperature ◽  
Intracytoplasmic Membrane ◽  
Methanospirillum Hungatei ◽  
Large Numbers ◽  
Intracytoplasmic Membranes

The frequency of intracytoplasmic membranes in several methanogens grown on H2–CO2 varied with the conditions of growth and varied from one strain to another. Methanobacterium thermoautotrophicum often generated large numbers of intracytoplasmic membranes, while Methanospirillum hungatei produced these membranes only rarely. Conditions allowing for rapid growth, including optimal temperature and high agitation rates, increased the production of intracytoplasmic membranes. These membranes consisted mainly of vesicles composed of one or several membrane layers, often positioned in the central region of the cytoplasm. Several mesophilic methanogens could be grown such that intracytoplasmic membranes were rarely or never observed in thin section or in replicas of cross-fractures from frozen cells. Since high rates of methane synthesis still occurred in these cultures, it follows that the intracytoplasmic membrane system is not a necessary organelle for methane formation in these strains. Negative staining for electron microscopy is not an accurate method to visualize intracytoplasmic membranes in these bacterial cells.

The fine structure of the haemocyte of the holothurian, Cucumaria miniata (Brandt)

1973 ◽  
Vol 51 (3) ◽  
pp. 323-332 ◽  
Author(s):  
A. R. Fontaine ◽  
Philip Lambert
Keyword(s):  
Fine Structure ◽  
Golgi Apparatus ◽  
Membrane System ◽  
Morphological Similarity ◽  
Lower Vertebrate ◽  
Functional Relationships ◽  
Lower Vertebrates ◽  
Marginal Band

The fine structure of the holothurian haemocyte is similar to that of the nucleated erythrocytes of lower vertebrates. Points of similarity include nuclear and nucleolar features, the distribution of haemoglobin, mitochondria, lysosomes, Golgi apparatus, and centrioles, and the presence of a marginal band of microtubules. Features apparently unique to this haemocyte are a canalicular system and an isolation membrane system. An interpretation of the functional relationships of the organelles is presented. Stages in the development and degradation of the haemocyte are also demonstrated. The morphological similarity of the holothurian haemocyte to lower vertebrate erythrocytes is attributed to functional analogy and parallel cellular adaptations, but not to homology.

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