Since the first reports by Cavalli-Sforza (9) and Hayes (24) of strains of Escherichia coli K-12 which are conjugational donors of chromosomal markers at high frequency (Hfr strains), many other Hfr strains have been isolated and our understanding of the mechanisms involved in Hfr formation has increased considerably. All Hfr strains arise from the integration of a conjugative plasmid into the ...

The ability of a nonenterotoxigenic, K88-negative porcine Escherichia coli strain of serogroup 045:K"E65" to induce attaching-effacing lesions was investigated in newborn pigs. Typical attaching-effacing lesions, characterized by intimate adherence of bacteria to mature enterocyte brush borders with effacement of the microvilli, were observed on light and electron microscopy. Bacteria were also...

Bacteria with strongly depressed phosphoglucomutase (EC 2.7.5.1) activity are found among the mutants of Escherichia coli which, when grown on maltose, accumulate sufficient amylose to be detectable by iodine staining. These pgm mutants grow poorly on galactose but also accumulate amylose on this carbon source. Growth on lactose does not produce high amylose but, instead, results in the inducti...

We have identified the gene gmk, in the same operon as rpoZ, spoT, and recG at about 82 minutes on the Escherichia coli chromosome. The gmk (GMP kinase) gene encodes a peptide of 23,592 Da, possessing extensive similarity to the amino acid sequence of guanylate kinase from yeast. To confirm that gmk truly encodes guanylate kinase and to explore some of its enzymatic features, we have overproduc...

The diethyl ether and ethyl acetate fractions of the peel fruit Solanum incanum. (S. incanum) were analyzed using gas chromatography-mass spectrometry (GC–MS). 105 compounds identified in fraction 75 fraction. Among them, 5 by fragmentation pattern, discussed, compared with NIST database. antibacterial screening was also conducted for bothdiethyl S.incanum four pathogens, two Gram-positive bact...

  Background and Objective: To evaluate extended spectrum betalactamase (ESBL) positive strains of Klebsiella pneumonia and Escherichia coli in positive bacterial cultures. Materials and Methods: In this analytical cross-sectional study, between March 2006 and March 2007, 170 bacterial isolates including 133 cases of E. coli and 37cases of K. pneumonia were...

AND LILLIAN K. SCHNEIDER..................................... 181 The Consequences of Mutation during the Growth of Biochemical Mutants of Escherichia coli. III. The Inhibition of Histidine-independent Bacteria by Histidineless I3acteria in Aerated Cultures. FRANCIS ,J. RYAN AND LILLIAN K. SCHUCHARDT ................................... 191 The Consequences of Mutation during the Growth of Bioch...

1.Dong, H., L. Nilsson and C.G. Kurland. 1995. Gratuitous overexpression of genes in Escherichia coli leads to growth inhibition and ribosome destruction. J. Bacteriol. 177:1497-1504. 2.Kim, J.-Y., H.A. Kang and D.D.Y. Ryu. 1993. Effects of the par locus on the growth rate and structural stability of recombinant cells. Biotechnol. Prog. 9:548-554. 3.Kumar, P.K.R., H.-E. Maschke, K. Friehs and K...

The current study aimed to investigate the effectiveness of Elephantopus scaber and Sauropus androgynus as anti-inflammatory agents in pregnant mice infected with Escherichia coli. This used seven treatments group (n=3): K- (healthy mice), K+ (pregnant E. coli), P1 coli + 100%), P2 75% S. 25%), P3 50% 50%), P4 25% 75%), P5 100%). Flow cytometry analysis was analyze cell populations expressing C...