G. W. Pettibone

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Growth and survival of enteric bacteria in freshwater sediments should be of concern to public health officials because of potential contributions of bacteria to the water column. Bacteria densities were measured in sediment and water using direct counts (DC), direct viable counts (DVC) and standard plate counts (PC). Both Salmonella sp. and Escherichia(More)
The impact of a sewage point source on the bacterial densities in an intertidal mud flat in Boston Harbor, Mass., was investigated. The area, Savin Hill Cove, acts as a receiving basin for a combined storm and sewage outlet (CSO). Preliminary examination of sediments and overlying water at high tide demonstrated that fecal coliforms were present in(More)
Pure cultures of Escherichia coli and Streptococcus faecalis and environmental water samples were examined for the possibility that pollution involving organotin compounds could decrease the values for indicator organisms when standard methods were applied to the analysis of water samples. (CH3)2SnCl2 and (CH3)3SnCl decreased viable counts at about 10 to(More)
The toxicities of three organotin compounds were examined on natural populations of microorganisms in sediments from Boston Harbor. Mono-, di-and trimethyltins were toxic to organisms from these sediments, and the di-and trimethyl compounds were more toxic than the monomethyl compound as measured by either viable counts or by [3H]thymidine uptake.(More)
Density of Aeromonas spp. at one site in the Buffalo River and at four sites on its upstream tributaries was followed from June 1992-June 1993. Membrane filtration counts of Aeromonas during the summer ranged between 18 and 4000 ml-1, which were one to two logs higher than faecal coliform and faecal streptococci densities. Aeromonas spp. in the Buffalo(More)
The survival of antibiotic-resistant and -sensitive strains of Escherichia coli, Enterococcus faecalis, Enterococcus faecium, Streptococcus equinus, and two environmental isolates, AP17 and AQ62, was examined in estuarine water. Each strain was rendered resistant to a combination of two antibiotics by serial passage in increasing concentrations of(More)
Arginine vasopressin (AVP) has been shown to have direct pressor effects on vascular smooth muscle. We have characterized a specific binding site for AVP in rat aorta membranes. We identified a specific binding site for AVP with a Kd of 1.6 nM and Bmax of 48 pM/mg protein. The time course, pH dependence, and temperature dependence were consistent with those(More)
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