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The Influence Of Somatic Investment On The Patterns Of Reproduction In Poecilia Latipinna (Pisces: Poeciliidae), Jeffrey D. Wetherington
The Influence Of Somatic Investment On The Patterns Of Reproduction In Poecilia Latipinna (Pisces: Poeciliidae), Jeffrey D. Wetherington
Retrospective Theses and Dissertations
In Poecilia latipinna size-specific reproductive and survivorship patterns were correlated with changes in habitat availability. Of the numerous physical, chemical, and biological parameters associated with a reduction in available habitat, probably the most important was reduced food availability. Large (old) females, theoretically with a low reproductive value, allocated energy to reproduction regardless of habitat and, presumably, food availability. When reproductive activities were initiated in March, habitat availability was modest. In association with a severe reduction in available habitat in April, large females were subject to a substantial loss of body weight during the yolk-loading phase of the reproductive cycle. This …
Differences Associated With Mating Type Alleles In Myxomycetes, Robert M. Queen
Differences Associated With Mating Type Alleles In Myxomycetes, Robert M. Queen
Retrospective Theses and Dissertations
Differences associated with the mating type alleles of Didymium iridis and Physarum polycephalum were examined with fluorescent antibody and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Heteroabsorption of each anti-myxamoebal serum followed by testing serum activity using immunofluorescence showed there is no strain-specific activity in any of the anti-myxamoebal sera, but the sera was shown, to be genera specific. Intergeneric differences and similarities were shown in the electrophoretic patterns of the myxamoebal protein extracts from P. polycephalum, D. iridis, and Dictyostelium discoideum when compared. Intraspecific differences were noted in D. iridis.
The Effect Of Ph On Methane Production From Dairy Cattle Manure, Mary G. Stafford
The Effect Of Ph On Methane Production From Dairy Cattle Manure, Mary G. Stafford
Retrospective Theses and Dissertations
The effects of pH upon methane production from anaerobic digestion of dairy cattle manure were investigated. One liter digesters were maintained by daily adjustment at the following pH levels: 7.6, 7.0, 6.0, 5.5, and 5.0. After 33 weeks of incubation the working volume of the digesters was increased to 3 liters. Digesters were incubated on a rotary shaker at 37°C. Digesters were loaded at the desired volatile solids concentrations, without an inoculum, and maintained from day one by daily additions and withdrawals to achieve a 3 day retention time. After 50 weeks of operation the manure from a second dairy …