Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Protozoans"”.
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Simulation models for assessing the effects of power plant cooling systems upon protozoans
… was to simulate the passage of water containing protozoans through the condensers of a steam electric station in order to determine the effects upon colonization of downstream communities. For preliminary tests an apparatus consisting of a test cell constructed of acrylic plastic with a small …
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The relative role of protozoans in the flux of phytoplankton nitrogen through pelagic food webs
… in that the percentage of carbon ingested as protozoans exceeded the percentage of carbon available as protozoans. Quantitatively, protozoans made up a highly variable component of the copepod diet. For example, at station 12, where the plankton assemblage was dominated by oligotrichous …
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Changes in colonization dynamics and community structure of protozoans and macroinvertebrates in response to stress
… was accelerated in the organic effluent for the protozoans. The macroinvertebrate G in the same effluent showed a dose response. There were no differences in rate between stations in the metals effluent for either the protozoans or the macroinvertebrates, although the equilibrium number of taxa …
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Interactions Between Protozoan Prey (<i>Phylum protista</i>) and Their Mosquito Predators (Order <i>Diptera</i>, Family <i>Cuclicidae</i>) Prey Size and Predator Behavior Effects
… larvae feed on microorganisms (including protozoans) and particulate organic matter Most larval feeding experiments. howt:ver, have dealt exclusively with bacteria, fungi , and particulate organic matter Although bactena and fungi are important sources of nitrogen and lipids, they may be …
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Some observations on oral protozoa of man
… is based upon the occurrence of oral protozoans among 25 periodontalclasial patients in Stockton, California. It is concerned, in part, with the correlation of infections with age, sex and oral health of the host and, in part, with culture techniques. The specific cultivation of …
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Diatom and protozoan community analysis and colonization on artificial substrates in lentic habitats
… environment, and 3. diatoms and photosynthetic protozoans are more closely related to the physico-chemical parameters of their environment than are the protozoans of all trophic groups. PF substrates were placed in the littoral zone of lentic habitats. Substrates were sampled through a time …
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Effect of Temperature upon Reproduction and Cyclic Development of Culture Forms of Trypanosoma Avium
… much research has been done on the parasitic protozoans of the suborder Trypanosomatina in general, particularly those pathogenic trypanosomes which infect mammals, relatively little research has been directed toward those forms which infect birds.
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The Role of Flagellates in Coke-Plant Activated Sludge.
… in the amount of biomass is facilitated. Protozoans, nematodes, and rotifers are known to prey on the bacteria in sludge and convert a portion of the unwanted biomass to carbon dioxide.Flagellated protozoans were observed in coke-plant activated sludge, and the biomass of their population …
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Observations of the growth of two strains of Trichomonas augusta from amphibians
… better medium for the cultivation of flagellate protozoans of the genus Trichomonas by varying the viscosity and nutrient content of the constituents. The second was to determine, by rates of division, the effects of various antibiotics upon axenic cultures, and the third, was to compare division …
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A DNA Determination in Developing Chick Marginal Tissue
… can be found in a variety of organisms such as protozoans, algae, fungi, yeasts, molds, amphibians and other vertebrates. In many instances cytoplasmic DNA has been found to be associated with such cytoplasmic organelles as mitochondria (Ephrussi and Slominski, 1955; Luck, 1953; Stone and …
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Algal and protozoan response to Holocene climate change and anthropogenic impact: a case study from Sluice Pond, MA
… lowstand oxygenated the bottom waters. Protozoans tolerant of low DO became abundant through the late Holocene as water levels rose and cultural eutrophication produced a sharp increase in biochemical oxygen demand (BOD) beginning in the 17th century. Recent sediments contain a dominance …
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The effect of organic carbon and nitrogen additions on inorganic nitrogen uptake by phytoplankton and bacteria
… enrichment was complicated by the presence of protozoans, which appeared to be indirectly responsible for decreased ammonium uptake due to depletion of this substrate in the presence of added glucose. The nanoplankton appeared to be responsible for the least nitrogen uptake with respect to …
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Interacting populations : hosts and pathogens, prey and predators
… (including bacteria, fungi, viri, and some protozoans) since they cause many infectious diseases. This thesis considers two different points in the population-interaction spectrum and focuses on modeling host-pathogen and predator-prey interactions. The first part focuses on epidemiology, i. …
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The in Vitro Effects of the Sulfate Conjugate of Dehydroepiandrosterone on the Incorporation of Radio Phosphate into the Various Fractions of Mouse Kidney Tissue
… to the maintenance of life in organisms from protozoans to mammals. As phosphate it combines in organic complexes involved in energy transformations within cells. As inorganic phosphate, it associates with calcium in the formation of osseous structures. In higher forms of life, phosphate is …
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The development and evaluation of a polymerase chain reaction assay for the diagnosis of mycobacterium tuberculosis infections
… infectious agents including virus, bacteria and protozoans. There have also been a few promising reports of PCR assays for M.tuberculosis and M.leprae. This thesis deals with the development of a PCR assay in which a repetitive 336 bp fragment is amplified from M.tuberculosis DNA. The assay is …
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Interacting populations : hosts and pathogens, prey and predators
… (including bacteria, fungi, viri, and some protozoans) since they cause many infectious diseases. This thesis considers two different points in the population-interaction spectrum and focuses on modeling host-pathogen and predator-prey interactions. The first part focuses on epidemiology, i. …
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Biological studies of GPI-anchoring in Trypanosoma cruzi
… and molecular genetics approaches. In several protozoans, including T.\r\ncruzi, dominant cell surface proteins are attached to the parasite membrane by\r\nglycosylphosphatidylinositol (GPI) anchors and play roles in host cell attachment and\r\ninvasion, and in parasite differentiation and …
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INVESTIGATION OF THE DISTAL APPENDAGE PROTEIN CEP164 IN Trypanosoma brucei
… are essential for the survival of single celled protozoans. These organelles are nucleated from a basal body after docking to the plasma membrane and are structurally similar to centrioles. Docking of the basal body requires the presence of transitional fibres, which mature from distal appendages …
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The Function of CARMIL1 in Migrating Cells
… structural differences in the CBR of protozoans and metazoans.</p>
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Expression and analysis of a legumain from trichomonas vaginalis
… trichomoniasis, respectively. As microaerophilic protozoans; both share a wide array of clinical manifestations ranging from vaginitis to abnormal pregnancies. Human trichomoniasis receives minimal public health attention despite of its worldwide high prevalence rate. Emerging evidence of …
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