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A BIRCH-ANDERSEN

Publications and source records attributed to A BIRCH-ANDERSEN.

At least 19 recordsLinked to original sources
PubMed1964

ULTRASTRUCTURE OF MYCOPLASMA SPECIES.

Domermuth, C. H. (Statens Seruminstitut, Copenhagen, Denmark), M. H. Nielsen, E. A. Freundt, and A. Birch-Andersen. Ultrastructure of Mycoplasma species. J. Bacteriol. 88:727-744. 1964.-The ultrastructure of 19 strains (15 species) of Mycoplasmatales grown on solid medium was studied with the aid of an electron microscope. The cells possessed a triple-layered limiting membrane 75 to 100 A thick. This membrane appeared to be symmetrical in some strains and asymmetrical in others. An electron-dense material found in close contact with the cell surface was tentatively interpreted to be a capsular substance. Ribosomes and strands of nuclear material were observed in the cytoplasm of cells of all strains. Ribosomes observed in the JA strain of M. gallisepticum were frequently arranged in a regular geometric pattern of characteristic appearance. Dense inclusions sometimes limited by triple-layered membranes (possibly developing elementary bodies), as well as membrane-surrounded vesicles, were observed in the cytoplasm of cells of some strains.

Cell Membrane↗
PubMed1964

GROSS MORPHOLOGY AND ULTRASTRUCTURE OF MYCOPLASMA GALLISEPTICUM.

Domermuth, C. H. (Statens Seruminstitut, Copenhagen, Denmark), M. Nielsen, E. A. Freundt, and A. Birch-Andersen. Gross morphology and ultrastructure of Mycoplasma gallisepticum. J. Bacteriol. 88:1428-1432. 1964.-The ultrastructure and gross morphology of Mycoplasma gallisepticum strains JA and W were studied with an electron microscope. Intact specimens were grown on Parlodion membranes, fixed with formaldehyde, and studied in situ. Sectioned specimens were grown on agar and were prepared for study by conventional sectioning techniques. Grossly, single and multiple (as many as four) protrusions were frequently observed extending from the surface of cells of the W strain. Single short protrusions extended from many of the cells of strain JA. In sectioned material, rows of what appeared to be developing elementary bodies (as many as four) were observed in cells of strain W, whereas, single, apparently developing elementary bodies were observed in strain JA. In both strains, these bodies were located within the protruding areas of the cell wall. The inclusion-containing portions of the cell appeared to be the protrusions which extended from the surface of the intact cell.

Cell Wall↗