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Morphological and biological properties of Salmonella typhimurium phage IRA were studied. The phage is a member of the Styloviridae family and exhibits a very wide spectrum of lytic activity. Molecular cloning of phage genes whose expression is lethal for the host cell has been performed and...
An extracellular α‐amylase from Micrococcus varians was partially purified (63 fold) by ammonium sulphate precipitation followed by dialysis and separated by molecular exclusion into three components with molecular weights ranging from approximately 14,000 to 56,000. The amylase had a pH optimum...
An extracellular α‐amylase was induced in cultures of Micrococcus varians during growth in a liquid medium containing starch as sole carbon source. Synthesis of this enzyme was repressed by the addition of glucose or fructose to starch metabolizing cells and was induced in a glucose or fructose...
The cryptic low copy plasmid designated as pIMB R8 was isolated from an industrial strain of the chlortetracycline producer Streptomyces aureofaciens R8/26. Using restriction endonucleases the pIMB R8 plasmid was characterized to have 15 kb. Subcloning of the Bam HI fragments of pIMB R8 into...
The host plant genotype significantly influenced the nodule Lb content in all of the combinations examined between 5 alfalfa (Medicago sativa) cultivars and 5 Rhizobium meliloti strains inoculated, on the contrary not the bacterial genotype. The inoculation with the strains exhibiting an...
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