During an investigation of air-borne microorganisms, the net electric charges carried by individual cells at various relative humidities were studied using a Millikan apparatus (1947), a device in which the vertical rates of movement of the cells under gravity and under imposed electric fields were measured. Cell size and charge could have been calculated directly from such measurements if the ...

The scope of this study was to apply the Biolog system to identify and characterize a Serratia strain isolated from the surface of black plastic pieces which constitute the fluidized bed filter (onsite wastewater technology, OSWT). The preliminary isolation of the strain was done in the medium with tetracycline at a 16 mg/l concentration. To characterize the isolated strain, the following Biolo...

Highly polymerized herring testis DNA of the random nucleotide sequence was used as a model of natural substrate to study some features of hydrolysis of the hybrid B-Z form with Serratia marcescens nuclease. The hybrid B-Z form was formed upon addition of 1.15 M MgSO4 and 0.421 mM Co(NH3)6Cl3. The DNA transition from the right handed B-form to the hybrid B-Z-form caused a decrease in Vmax of DN...

Serratia marcescens, a nonpathogen, greatly facilitates the general study of airborne bacteria. However, the value of many studies has been lessened by the omission of strain designation which makes comparison of results from different investigators impossible. The presence of variants in S. marcescens strain ATCC 274 used in these studies has been reported previously (Bunting, 1940a, b, 1942; ...

In a previous paper (Monk et al., 1956) on the effect of water on the death rate of Serratia marcescens, a particularly lethal effect was found at a water content of about 50 per cent in the mixture of cells and additives. Since the vapor pressure characteristics of the cells and each of the components was not known in detail it was not possible to determine how much of this water was in the ce...

Fifty milk samples were assessed for prevalence and enumeration of coliform bacteria under refrigeration. Refrigeration exerted profound effect conferring diminished growth of Citrobacter, Enterobacter and Serratia, however, itfavoured Salmonella, E.coli and Klebsiella on other hand. Among them, Salmonella appeared with highest load both in pre-refrigerated (23%) as well as post-refrigerated (4...

Serratia marcescens strains were divided into three groups on the basis of antimicrobial sensitivity and pigment production. Group I, nonpigmented, was resistant to most antibiotics. Group II, nonpigmented, was susceptible to many antimicrobial agents, as was group III which was pigmented. Representative organisms of each group were examined for all lipid content. There were no significant diff...

In vitro lymphocyte responses to Pseudomonas aeruginosa have been found to be impaired in cystic fibrosis patients with advanced clinical disease. The responses to Klebsiella pneumoniae, Serratia marcescens, and Proteus mirabilis were studied in a similar group of cystic fibrosis patients and normal individuals. Cystic fibrosis patients found to be unresponsive to pseudomonas were also unrespon...