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Microbial ecology of an old-growth Douglas fir canopy

Creator:: Caldwell, Bruce A.
Abstract:: Microbial populations associated with the major substrates of the canopy of a 70 m old-growth Douglas fir were studied to determine potential activities. Seasonal samples from bark, foliage, epiphytic moss, lichens, and litter accumulations were collected to i) obtain population data, ii) to isolate the major groups of microorganisms present,...
Resource Type:: Masters Thesis
Full Text:: nitro- genous and sulfur compounds (Alexander, 1977). The purpose of this paper is to report on an

Tracing septic system effluent movement through saturated hillslope soils

Creator:: McCoy, Edward L.
Abstract:: Three isolates of Escherichia coli were labeled by their resistance to sodium azide and, separately, to novobiocin, nalidix acid, and tetracycline. The strains exhibited a high degree of persistence in the soil environment and were recoverable on strain specific media at levels within the 95% confidence interval of the numbers...
Resource Type:: Masters Thesis
Full Text:: ecosystem analysis is well documented (Danso et al., 1973; Habte and Alexander, 1975; Hagedorn et al

The role of S-adenosylmethionine in the biosynthesis of ergosterol and related sterols in Saccharomyces cerevisiae

Creator:: Turner, Jan Ross
Abstract:: An enzyme system was prepared from Saccharomyces cerevisiae, strain MCC, which carries out the transfer of the methyl group from S-adenosylmethionine or methionine to the side chain of yeast sterols. The cell-free system has been shown to be incapable of synthesizing ergosterol but carries out the synthesis of two as...
Resource Type:: Dissertation
Full Text:: isolated from ergot in 1889 by Charles Tanret. In 1920, Smedley - Maclean isolated and purified a sterol

Survival of fecal coliform bacteria in sludge-amended soils

Creator:: Hartel, Peter G.
Abstract:: A study was conducted to determine the effects or temperature, solar radiation, rainfall, and saturated flow on fecal coliform numbers in sewage sludge-amended soils. To determine this, four 4.6 X 13.7 m field plots were each amended in summer and in winter with 800 liters of anaerobically-digested sewage sludge, and...
Resource Type:: Dissertation
Full Text:: density-dependent (Habte and Alexander, 1975) and it is probable that the physical separation in the

Dam Removal and Implications for Fish Health: Ceratomyxa shasta in the Williamson River, Oregon, USA

Creator:: Hurst, Charlene N., Holt, Richard A., and Bartholomew, Jerri L.
Abstract:: The removal of dams on a river is one potential tool for the ecological restoration of native salmonid fishes. However, the removal of barriers also introduces risks, such as the introduction of fish pathogens into previously isolated populations. The proposed removal of four dams on the Klamath River, Oregon–California, provides...
Resource Type:: Article
Full Text:: use practices have decreased natural riparian shading, re- sulting in warmer temperatures (Boyd et al

Consequences of Influenza A Virus on Pneumococcal Biofilm Formation and Stability in the Absence of Host Factors

Creator:: Nutter, Laura
Abstract:: Streptococcus pneumoniae and Influenza A Virus both primarily infect the upper respiratory tract, with more severe disease occurring during coinfection than would be caused by either pathogen independently. Until recently, characterization of the interactions between these two pathogens has occurred exclusively in the context of a host or using host-derived...
Resource Type:: Masters Thesis

Sphingolipid Perturbations as Mechanisms for Fumonisin Carcinogenesis

Creator:: Riley, Ronald T., Enongene, Evaristus, Voss, Kenneth A., Norred, William P., Meredith, Filmore I., Sharma, Raghubir P., Spitsbergen, Jan, Williams, David E., Carlson, David B., and Merrill, Alfred H. Jr.
Abstract:: There is a great deal of evidence that altered sphingolipid metabolism is associated with fumonisin-induced animal diseases including increased apoptotic and oncotic necrosis, and carcinogenesis in rodent liver and kidney. The biochemical consequences of fumonisin disruption of sphingolipid metabolism most likely to alter cell regulation are increased free sphingoid bases...
Resource Type:: Article
Full Text:: –41 (1996). 29. Kang YK, Alexander JM. Alteration of the glutathione redox cycle status in fumonisin

Herbicide effects on Bdellovibrio bacteriovorus

Creator:: Wehr, Nancy Briggs
Abstract:: Bdellovibrio bacteriovorus is a small parasitic bacterium present in soil, mud, and aquatic habitats. Due to its lysis of Gramnegative bacteria, an important role in soil ecology has been suggested for this organism. A study of effects of herbicides upon Bdellovibrio might consequently be of considerable value. In this study...
Resource Type:: Masters Thesis
Full Text:: , upon heterotrophic soil microorganisms. 9 Alexander (2, 3) noted abnormal enzyme activity and

S-adenosylmethionine : [triangle]²⁴-sterol methyltransferase and the regulation of ergosterol biosynthesis in Saccharomyces cerevisiae

Creator:: Bailey, Richard B.
Abstract:: The inhibition of S-aden.osylmethionine: Δ²⁴-sterol methyltransferase (EC 2.1.1.41) activity by endogenous cellular components has been studied in vitro. The principal inhibitors were Na⁺ and K⁺; Cs⁺, NH₄⁺ and Li⁺ were also shown to inhibit the reaction. The inhibition by potassium cation has been studied, and we have found that energy...
Resource Type:: Dissertation
Full Text:: role in ergosterol biosynthesis. 3 LITERATURE REVIEW Ergosterol was first isolated by Charles

Studies on control of diacetyl off-flavor in beer

Creator:: Tolls, Terry Norman
Abstract:: Sporadic outbreaks of diacetyl off-flavor in beer are a serious economic problem to the brewing industry. Studies were carried out in an attempt to improve the understanding of the problem and to experiment with new ways of controlling this defect. The Owades and Jakovac method of diacetyl determination as modified...
Resource Type:: Masters Thesis
Full Text:: . To Charles Pfizer & Company, Inc. , for providing the financial support for this research. To the

ScholarsArchive@OSU

Microbial ecology of an old-growth Douglas fir canopy

Tracing septic system effluent movement through saturated hillslope soils

The role of S-adenosylmethionine in the biosynthesis of ergosterol and related sterols in Saccharomyces cerevisiae

Survival of fecal coliform bacteria in sludge-amended soils

Dam Removal and Implications for Fish Health: Ceratomyxa shasta in the Williamson River, Oregon, USA

Consequences of Influenza A Virus on Pneumococcal Biofilm Formation and Stability in the Absence of Host Factors

Sphingolipid Perturbations as Mechanisms for Fumonisin Carcinogenesis

Herbicide effects on Bdellovibrio bacteriovorus

S-adenosylmethionine : [triangle]²⁴-sterol methyltransferase and the regulation of ergosterol biosynthesis in Saccharomyces cerevisiae

Studies on control of diacetyl off-flavor in beer

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