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Articles 61 - 63 of 63
Full-Text Articles in Microbiology
Evidence For The Horizontal Acquisition Of Murine Akr Virogenes By Recent Horizontal Infection Of The Germ Line, Stephen J. O'Brien, Janet L. Moore, Malcolm A. Martin, James E. Womack
Evidence For The Horizontal Acquisition Of Murine Akr Virogenes By Recent Horizontal Infection Of The Germ Line, Stephen J. O'Brien, Janet L. Moore, Malcolm A. Martin, James E. Womack
Biology Faculty Articles
Several recent reports have established the biological and molecular genetic similarity between the endogenous AKV virus of strain AKR, and an N-ecotropic endogenous virus found in the genome of feral Japanese mice, Mus musculus molossinus. The similarities are so striking as to suggest a common origin of these viruses, which are present in some, but not all, inbred mouse strains. The virogenes of AKR mice may have been acquired by either: (a) common descent of AKR (and other AKV+ strains) from a common ancestor of AKR and molossinus animals, or (b) horizontal germ line infection of the AKR …
Analysis Of Multiple Isoenzyme Expression Among Twenty-Two Species Of Mycoplasma And Acholeplasma, Stephen J. O'Brien, Janice M. Simonson, Marion W. Grabowski, Michael F. Barile
Analysis Of Multiple Isoenzyme Expression Among Twenty-Two Species Of Mycoplasma And Acholeplasma, Stephen J. O'Brien, Janice M. Simonson, Marion W. Grabowski, Michael F. Barile
Biology Faculty Articles
Crude extracts of triple-cloned, purified cultures of 22 species of Mycoplasma and Acholeplasma were examined for expression of 21 isozyme systems routinely used to type mammalian cells. Nine previously described enzymes (purine nucleoside phosphorylase, adenylate kinase, dipeptidase, esterase, glyceraldehyde-3-phosphate dehydrogenase, glucose phosphate isomerase, glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, and superoxide dismutase) and three enzymes not previously reported in mycoplasma (triose phosphate isomerase, inorganic pyrophosphatase, and acid phosphatase) were detected in some or all of the species examined. These findings provide new information on the enzymatic expressions of these organisms. Three of the isozyme systems (superoxide dismutase, glucose-6-phosphate dehydrogenase, and 6-phosphogluconate dehydrogenase) …
Bvr-1, A Restriction Locus Of A Type C Rna Virus In The Feline Cellular Genome: Pleiotropic Restriction Of Endogenous Balb Virus In Cat X Mouse Somatic Cell Hybrids, Stephen J. O'Brien, Janice M. Simonson
Bvr-1, A Restriction Locus Of A Type C Rna Virus In The Feline Cellular Genome: Pleiotropic Restriction Of Endogenous Balb Virus In Cat X Mouse Somatic Cell Hybrids, Stephen J. O'Brien, Janice M. Simonson
Biology Faculty Articles
Bvr-1 is a dominant X-linked feline gene which restricts the replication of B-tropic murineleukemia virus (B-MuLV) in somatic cell hybrids between murine BALB/c-RAG cells and FL-74 feline cells. Since the hybrids were originally derived by the hypoxanthine aminopterin thymidine selection scheme, counter selection experiments on 6-thioguanine result in preferential survival of hybrid cells which have spontaneously lost the feline X-chromosome on which is located the structural gene for hypoxanthine guanine phosphoribosyl transferase (IMP: pyrophosphate phosphoribosyl transferase, E.C. 2.4.2.8) and Bvr-1. Back selected Bvr-1- cells express high parental levels of B-MuLV. Bvr-1- effectively restricts the IdU-mediated induction of …