Ronald W Harvey (Former Employee)
Science and Products
Filter Total Items: 80
Growth determinations for unattached bacteria in a contaminated aquifer Growth determinations for unattached bacteria in a contaminated aquifer
Growth rates of unattached bacteria in groundwater contaminated with treated sewage and collected at various distances from the source of contamination were estimated by using frequency of dividing cells and tritiated-thymidine uptake and compared with growth rates obtained with unsupplemented, closed-bottle incubations. Estimates of bacterial generation times [(In 2)/μ] along a 3-km...
Authors
R.W. Harvey, L.H. George
Sorption of lead onto two gram-negative marine bacteria in seawater Sorption of lead onto two gram-negative marine bacteria in seawater
Laboratory adsorption experiments performed at environmentally significant lead (Pb) and cell concentrations indicate that the marine bacteria examined have significant binding capacities for Pb. However, the behavior governing Pb sorption onto gram-negative bacteria in seawater may be quite complex. The sorption kinetics appear to involve two distinct phases, i.e., a rapid removal of Pb...
Authors
Ronald W. Harvey, James O. Leckie
Effect of adherent bacteria and bacterial extracellular polymers upon assimilation by Macoma balthica of sediment-bound Cd, Zn and Ag Effect of adherent bacteria and bacterial extracellular polymers upon assimilation by Macoma balthica of sediment-bound Cd, Zn and Ag
Effects of adherent bacteria and bacterial extracellular polymer (exopolymer) upon uptake of particle-bound Cd, Zn and Ag by the deposit-feeding clam Macoma balthica were studied in the laboratory. Amorphous iron oxyhydroxide and unaltered and alkaline-extracted sediments were used as model particulates in separate, controlled deposit-feeding experiments. In general, amounts of metal...
Authors
Ronald W. Harvey, Samuel N. Luoma
Separation of solute and particulate vectors of heavy metal uptake in controlled suspension-feeding experiments with Macoma balthica Separation of solute and particulate vectors of heavy metal uptake in controlled suspension-feeding experiments with Macoma balthica
Radioisotope labelling experiments with the estuarine clam, Macoma balthica, are described, in which a filter chamber device was used to separate solute metal uptake from uptake, of metals associated with suspended bacteria. Solute uptake contributed a majority of the 14-day total body burdens of 65Zn and 109Cd, whereas 57Co uptake largely resulted from ingestion of isotope-laden...
Authors
Ronald W. Harvey, Samuel N. Luoma
Effect of organic contamination upon microbial distributions and heterotrophic uptake in a Cape Cod, Massachusetts, aquifer Effect of organic contamination upon microbial distributions and heterotrophic uptake in a Cape Cod, Massachusetts, aquifer
No abstract available.
Authors
R.W. Harvey, R. L. Smith, L. George
The role of bacterial exopolymer and suspended bacteria in the nutrition of the deposit-feeding clam, Macoma balthica The role of bacterial exopolymer and suspended bacteria in the nutrition of the deposit-feeding clam, Macoma balthica
Significant removal and assimilation of suspended bacteria by M. balthica was observed within two days, although the low clearance rates suggested planktonic bacteria may not be among its major food sources.
Authors
R.W. Harvey, Samuel N. Luoma
Transport and distribution of bacteria and diatoms in the aqueous surface micro-layer of a salt marsh Transport and distribution of bacteria and diatoms in the aqueous surface micro-layer of a salt marsh
The effects of tide and wind upon the distribution and transport of bacteria and diatoms in the aqueous surface microlayers of a Massachusetts and San Francisco Bay salt marsh were examined. The compression of the surface films by both tide and wind resulted in significant enrichments of bacterioneuston. At the San Francisco Bay site, significant numbers of diatoms were transported...
Authors
Ronald W. Harvey, Leonard W. Lion, Lily Y. Young
Enrichment and association of lead and bacteria at particulate surfaces in a salt-marsh surface layer Enrichment and association of lead and bacteria at particulate surfaces in a salt-marsh surface layer
The particle-laden surface layer (approx 150-370 mu m) and subsurface waters of a South San Francisco Bay salt marsh were sampled over 2 tidal cycles and analyzed for particle numbers and particulate-associated and total concentrations of Pb and bacteria. Laboratory studies examined the ability of a bacterial isolate from the surface layer and a bacterial 'film-former' to sorb Pb at
Authors
R.W. Harvey, Leonard W. Lion, L.Y. Young, J.O. Leckie
Science and Products
Filter Total Items: 80
Growth determinations for unattached bacteria in a contaminated aquifer Growth determinations for unattached bacteria in a contaminated aquifer
Growth rates of unattached bacteria in groundwater contaminated with treated sewage and collected at various distances from the source of contamination were estimated by using frequency of dividing cells and tritiated-thymidine uptake and compared with growth rates obtained with unsupplemented, closed-bottle incubations. Estimates of bacterial generation times [(In 2)/μ] along a 3-km...
Authors
R.W. Harvey, L.H. George
Sorption of lead onto two gram-negative marine bacteria in seawater Sorption of lead onto two gram-negative marine bacteria in seawater
Laboratory adsorption experiments performed at environmentally significant lead (Pb) and cell concentrations indicate that the marine bacteria examined have significant binding capacities for Pb. However, the behavior governing Pb sorption onto gram-negative bacteria in seawater may be quite complex. The sorption kinetics appear to involve two distinct phases, i.e., a rapid removal of Pb...
Authors
Ronald W. Harvey, James O. Leckie
Effect of adherent bacteria and bacterial extracellular polymers upon assimilation by Macoma balthica of sediment-bound Cd, Zn and Ag Effect of adherent bacteria and bacterial extracellular polymers upon assimilation by Macoma balthica of sediment-bound Cd, Zn and Ag
Effects of adherent bacteria and bacterial extracellular polymer (exopolymer) upon uptake of particle-bound Cd, Zn and Ag by the deposit-feeding clam Macoma balthica were studied in the laboratory. Amorphous iron oxyhydroxide and unaltered and alkaline-extracted sediments were used as model particulates in separate, controlled deposit-feeding experiments. In general, amounts of metal...
Authors
Ronald W. Harvey, Samuel N. Luoma
Separation of solute and particulate vectors of heavy metal uptake in controlled suspension-feeding experiments with Macoma balthica Separation of solute and particulate vectors of heavy metal uptake in controlled suspension-feeding experiments with Macoma balthica
Radioisotope labelling experiments with the estuarine clam, Macoma balthica, are described, in which a filter chamber device was used to separate solute metal uptake from uptake, of metals associated with suspended bacteria. Solute uptake contributed a majority of the 14-day total body burdens of 65Zn and 109Cd, whereas 57Co uptake largely resulted from ingestion of isotope-laden...
Authors
Ronald W. Harvey, Samuel N. Luoma
Effect of organic contamination upon microbial distributions and heterotrophic uptake in a Cape Cod, Massachusetts, aquifer Effect of organic contamination upon microbial distributions and heterotrophic uptake in a Cape Cod, Massachusetts, aquifer
No abstract available.
Authors
R.W. Harvey, R. L. Smith, L. George
The role of bacterial exopolymer and suspended bacteria in the nutrition of the deposit-feeding clam, Macoma balthica The role of bacterial exopolymer and suspended bacteria in the nutrition of the deposit-feeding clam, Macoma balthica
Significant removal and assimilation of suspended bacteria by M. balthica was observed within two days, although the low clearance rates suggested planktonic bacteria may not be among its major food sources.
Authors
R.W. Harvey, Samuel N. Luoma
Transport and distribution of bacteria and diatoms in the aqueous surface micro-layer of a salt marsh Transport and distribution of bacteria and diatoms in the aqueous surface micro-layer of a salt marsh
The effects of tide and wind upon the distribution and transport of bacteria and diatoms in the aqueous surface microlayers of a Massachusetts and San Francisco Bay salt marsh were examined. The compression of the surface films by both tide and wind resulted in significant enrichments of bacterioneuston. At the San Francisco Bay site, significant numbers of diatoms were transported...
Authors
Ronald W. Harvey, Leonard W. Lion, Lily Y. Young
Enrichment and association of lead and bacteria at particulate surfaces in a salt-marsh surface layer Enrichment and association of lead and bacteria at particulate surfaces in a salt-marsh surface layer
The particle-laden surface layer (approx 150-370 mu m) and subsurface waters of a South San Francisco Bay salt marsh were sampled over 2 tidal cycles and analyzed for particle numbers and particulate-associated and total concentrations of Pb and bacteria. Laboratory studies examined the ability of a bacterial isolate from the surface layer and a bacterial 'film-former' to sorb Pb at
Authors
R.W. Harvey, Leonard W. Lion, L.Y. Young, J.O. Leckie