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Related post: Cooperating Units i Laboratory of Clinical Investigations, NIAID, Clinical Mycology j Section (K. J. Kwon-Chung) Division of Infectious Diseases, Medical College of Virginia, Richmond (G. L. Archer) Pediatric Infectious Disease Division, University of Colorado j Medical Center, Denver (B. A. Lauer) Laboratory of Infectious Diseases, NIAID, Mycoplasma Section (J. ; G. Tully) I I I Group I .N. S. E. R.M. , U. 65 Montpellier-Nimes , Faculte de Medicine, j Nimes, France (J. Schmitt-Slomska) ! Agriculture Research Service, U.S.D.A., Beltsville, Md. (R. F. ; Whitcomb; D. Stiller) Project Description Objectives are to provide, as required, electron microscopy facilities in support of other projects in the Laboratory; and to conduct such original and in depth studies of the ultrastructure of microorganisms as may be engendered by collaborative Dutasteride For Sale beginnings 1 or by independent approach to problems. ' 1. New strains of spiroplasmas examined for viruses (SpV) included 2 S. citri (105; SpVl+, SpV2+: ASP-1; SpVl+, SpV3+) , 1 corn stunt (Mississippi; no virus), 4 flower (PPSl, Fl, F2; no virus: L89; SpV3+) , 1 bee (B13; SpV3+) . The strains originated in the United States, Morocco, or France. Evidence to date indicates that 90% of 67 spiroplasma strains carry Buy Dutasteride Uk one or more of the 3 known viruses, unrelated to the original host or geographic origin of the spiroplasma. 2. There is considerable international interest, reflected in several recent publications, in the nature of internal filaments of spiroplasmas. Others have purified them and shown that they represent a protein of 55,000 daltons MW, but the site(s) Dutasteride Msds and nature of their attachment to membrane in order to supply motility (if they are indeed contractile protein) remains obscure. Our attempts to localize them in situ by brief and minimal detergent treatment, followed by rapid fixation, embedment, sectioning, and electron microscopy, were unsuccessful. The procedures will be repeated with high dilutions of digitonin, which was recently reported effective in visualizing the cytoskeleton of mammalian cells. 26-15 Project No. ZOl AI 00004-20 LSD 3. Other mycoplasmas examined included strains of M. pneumoniae (A. Liss; J. G. Tully) , Acholeplasma laidlawii and S. sp. 72-043 (J. G. Tully) , and avian strains CKK and Iowa 695 (J. G. Tully) . The latter were found to possess a well-defined outer layer of undefined material surmounting the membrane — a feature not noted in published descriptions of the species. The non-helical morphology of the S. citri , spiroplasma mutant, ASP-1, was affirmed by examination of cloned cultures. 4. The progress of protoplast formation in Group B streptococci treated with crude and purified preparations of mutanolysin (a new cell-wall, lytic enzyme) was examined in thin sections. (See also ZOl AI 00181-02; Calandra) Purified enzyme produced good Dutasteride Australia protoplasts useful for physiologic studies, which was not possible with other known murein hydrolases: crude enzyme resulted in optical density increases that were found to be due to coagulation of cytoplasm induced, it is assumed, by other enzymes and impurities in the preparation. 5. For comparisons of known strains with recent isolates, 6 strains of staphylococci prepared both in Richmond and in our lab, were sectioned and examined for Dr. Archer (Medical College of Virginia) . No unusual or unexpected differences were found. 6- Owing to interest engendered from a previously published report on an erythrocyte-associated bacterium in human infection (See Publications) , we received some other examples of RBC- associated prokaryotes. Examination of thin sections of blood from a cow infected with Eperythrozoon wenyonii clearly demonstrated that this organism, like other species of the genus occurred both free and erythrocyte-associated and was an ovoid to rod-shaped prokaryote enclosed by a single limiting membrane--in which latter respect it resembles mycoplasmas more than the other members of the Anaplasmataceae. Renewed attempts at its culture, with new media, have so far been unsuccessful (Whitcomb, Stiller; U.S.D.A.). Samples of a febrile patient's blood, in which a red-cell associated bacterium had been presumably seen, were processed and examined in section, but no microorganisms have yet been found (B. Lauer, Univ. Colorado Medical Center) . Because of resemblance of our original RBC- associated bacterium to published electron micrographs of the bacterium associated with Whipple's disease, we have been seeking specimens of the latter. One biopsy was furnished by Dr. Archer (Medical College of Virginia), but unfortunately (probably because of some treatment followed by remission) failed to reveal any bacteria in numerous sections examined. The problem of uncultured prokaryotes in blood or other tissues, in recognized diseases, is of interest; and more specimens will be examined as they become available. 26-19 Project No. ZOl AI 00004-20 LSD 7. Examples of parent bacteria and a stable L form (the first known) of Brucella suis were received from France (Schmitt-
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