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Articles 271 - 278 of 278
Full-Text Articles in Physical Sciences and Mathematics
Seasonal Changes In The Growth And Structure Of The Diatom Asterionella Formosa Hassall In Lake Matoaka, Virginia, Kathy Joyce Lundgren
Seasonal Changes In The Growth And Structure Of The Diatom Asterionella Formosa Hassall In Lake Matoaka, Virginia, Kathy Joyce Lundgren
Dissertations, Theses, and Masters Projects
No abstract provided.
Cell Mediated Immunity By Cytotoxicity Assay And The Effect Of Corynebacterium Parvum And Radiation On Mice Bearing Herpes-Induced Tumors, Robert B. Stagg
Cell Mediated Immunity By Cytotoxicity Assay And The Effect Of Corynebacterium Parvum And Radiation On Mice Bearing Herpes-Induced Tumors, Robert B. Stagg
Loma Linda University Electronic Theses, Dissertations & Projects
Cell mediated immune (CMI) cytotoxic reactivity of Balb/c mice against H238 cells, a Herpes simplex virus (HSV) Type 2 - induced sarcoma, was measured by the 125IUdR release assay. The Balb/c mouse response to the growing HSV-induced tumor, treated with radiation and , was measured by survival rate, tumor growth and immune cytotoxicity of spleen and peritoneal exudate cells (PEC) as determined by 125IUdR release assay. Subcutaneous (s.c.) inoculation of 1 x 106 H238 cells (high dose) produced progressive tumor growth while s.c. inoculation of 1 x 104 H238 cells (low dose) produced no tumors. A …
Chitinoclastic Bacteria From The Mid-Atlantic Shelf: Distribution, Taxonomy, And Effect Of Oil On Growth And Chitin Degradation, Darbie Anne Lister
Chitinoclastic Bacteria From The Mid-Atlantic Shelf: Distribution, Taxonomy, And Effect Of Oil On Growth And Chitin Degradation, Darbie Anne Lister
Dissertations, Theses, and Masters Projects
No abstract provided.
Bacterial Response To Crude Oil Spillage In A Salt Marsh, Russell Paul Herwig
Bacterial Response To Crude Oil Spillage In A Salt Marsh, Russell Paul Herwig
Dissertations, Theses, and Masters Projects
No abstract provided.
A Statistical Approach To The Study Of The Ecosystems Of Seven Ponds In East-Central Illinois, Gregory Lee Orr
A Statistical Approach To The Study Of The Ecosystems Of Seven Ponds In East-Central Illinois, Gregory Lee Orr
Masters Theses
Gross primary productivity, heterotrophic bacterial numbers, and net phytoplankton densities of seven ponds in Coles County, Illinois, were studied in relation to physical, chemical, and biological habitat variables (light intensity and duration, turbidity, water temperature, pH, dissolved oxygen, sulfur, nitrogen, phosphorus, production, bacteria, and phytoplankton). Ten observations were made for each pond (except where otherwise noted) from 17 June through 25 August 1974. Stepwise multiple linear regression analyses of the data were used in order to determine those environmental factors which were important in predicting (i.e., significantly correlated with) bacterial and phytoplankton densities, and production. A multiple linear regression equation …
Pesticide Effects In A Simulated Soil Ecosystem, Raymond J. Samp
Pesticide Effects In A Simulated Soil Ecosystem, Raymond J. Samp
Masters Theses
The screening of pesticides to determine which were most inhibitory to bacteria was accomplished by testing the effects of 10 pesticides on 9 different organisms using the disk assay method. Results showed that Gram positive bacteria were more sensitive to all pesticides tested than were the Gram negative bacteria. In addition, the hormone herbicides were found to be the most inhibitory to these bacteria and 2,4-D (2,4-dichlorophenoxyacetic acid), a hormone herbicide, was chosen for subsequent in vivo studies.
A soil perfusion apparatus was used to determine the effects of 2,4-D in a typical soil ecosystem. Bacterial plate counts and nutrient …
The Fecal Shedding Of Listeria Monocytogenes By Conventional And "Germ Free" Mice, Margaret Joyce Ramsay
The Fecal Shedding Of Listeria Monocytogenes By Conventional And "Germ Free" Mice, Margaret Joyce Ramsay
Loma Linda University Electronic Theses, Dissertations & Projects
A series of experiments involving Listeria monocytogenes was undertaken to study first the fecal shedding of Listeria by conventional mice challenged intraperitoneally with Listeria and second the fecal shedding and ability to survive of germ free mice with similar challenge. In addition, mites infesting Listeria infected mice were cultured for their possible contamination by Listeria.
Conventional mice were challenged intraperitoneally with a single near LD50 dose of Listeria. Fecal Listeria were detected by collecting specimens from each mouse daily for the first 4 days and every second day thereafter. The feces was held at 7°C for 14 …
Host And Prophage Modifications Of Ultraviolet Induction In Salmonella Potsdam, Bela B. Toth
Host And Prophage Modifications Of Ultraviolet Induction In Salmonella Potsdam, Bela B. Toth
Loma Linda University Electronic Theses, Dissertations & Projects
In induction experiments with naturally occurring and artificially lysogenic strains of S. potsdam, cells were irradiated in buffer, transferred to complete medium, and then assayed for free phage. Irradiation was followed by half hourly samples for free phage from the growing populations of irradiated cells. For an estimation of burst sizes, the irradiated cells were diluted out to a final concentration of 1 cell per ml and distributed to tubes in 0.5 ml quantities. All assays were done by the top-layer method with streptomycin incorporated in the top-layer and SP2-strr as the bacterial indicator. The non-lysogenic strain S. …