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 1411 for “"Microorganisms"”.
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Growth dynamics of microorganisms
Pure cultures o! the yeast S. cerevisiae do not follow the classical continuous culture theory when tested in a variety or chemostats. Using a Coulter Counter, yeast populations were sized and enumerated electronically over a range or dilution rates. Total dry weight and Kjeldahl nitrogen per cell …
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Phosphofructokinases from extremely thermophilic microorganisms
The distribution of phosphofructokinase (PFK) phosphoryl donor subtypes [ATP-, ADP- and pyrophosphate (PPᵢ)] in the deeply rooted phylogenetic lineages of thermophiles is of interest with respect to the evolution of PFK activity and of the Embden-Meyerhof (EM) pathway. To gain additional insight …
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Digital holographic imaging of microorganisms
Imaging aquatic microorganisms in 3D space is of interest to biologists and ocean scientists seeking to understand the behavior of these organisms in their natural environments. In this research, digital holographic imaging (DHI), with a 4f system providing transverse magnification of 9.1, is used …
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Assimilatory sulfur metabolism in marine microorganisms
… of the marine bacteria relative to terrestrial microorganisms are consistent with the saturating concentration of sulfate that is always present in their environment. Substantial differences also exist between the two marine bacteria, notably in the effect of thiosulfate on sulfate uptake. P. …
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River oxygen uptake by benthic microorganisms
The factors influencing benthic microbial uptake of river dissolved oxygen (DO) and dissolved organic matter (DOM) were investigated in 4 New Zealand rivers receiving organic waste discharges from dairy factories and a pulp and paper company. A chamber system for in situ use was developed and …
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Elemental Stoichiometry of Freshwater Hyporheic Microorganisms
<p>The work presented herein is part of the Microbial Observatory Project in the Nyack Floodplain. The Nyack Valley Floodplain is a glacier-carved floodplain in the Middle Fork of the Flathead River on the south west border of Glacier National Park and north of the Great Bear Wilderness in …
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Elemental Stoichiometry of Freshwater Hyporheic Microorganisms
<p>The work presented herein is part of the Microbial Observatory Project in the Nyack Floodplain. The Nyack Valley Floodplain is a glacier-carved floodplain in the Middle Fork of the Flathead River on the south west border of Glacier National Park and north of the Great Bear Wilderness in …
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The permeability of cellophane to microorganisms
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Biology and Public Health, 1931.
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Growth in mixed cultures of microorganisms
… Counter was used for detecting the number of the microorganisms grown in mixed cultures. Size distribution curves were prepared and used as a means for determining the Coulter Counter settings for counting each organism. Coulter Counter counts were compared with Petroff-Hausser counts; the results …
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Production of novel amine oxidases from microorganisms
With the advent of molecular biology and genetic transformation the production of high value proteins in recombinant host cells has become an everyday reality. However, the establishment of the optimum conditions for every target protein requires to take into account the nature of the product, and …
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Discovery of novel transaminases from halophilic microorganisms
… TAm discovery programme from halophilic microorganisms from the ancient hypersaline environment, Kilroot saltmine. TAms have been characterised from both bacteria and archaea, and produced in a number of expression models using both culture-dependent and independent methods. As well as …
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Hydrodynamics of swimming microorganisms in complex fluids
<p>Swimming motion of microorganisms, such as spermatozoa, plankton, algae and bacteria, etc., ubiquitously occurs in nature. It affects many biological processes, including reproduction, infection and the marine life ecosystem. The hydrodynamic effects are important in microorganism swimming, …
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Effects of cyanide on trickling filter microorganisms
Thesis (M.S.)--Michigan State College of Agriclture and Applied Science. Dept. of Chemical Engineering, 1954
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Engineering microorganisms for synthesizing value-added products
… to produce value-added products using engineered microorganisms. Recent developments in metabolic engineering have allowed us to improve endogenous metabolic pathways or introduce heterologous metabolic pathways into microorganisms so that the engineered microorganisms have desired properties and …
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Degradation of pentachlorophenol by anaerobic subsurface microorganisms
Microbial populations from subsurface soil collected from a hydrocarbon contaminated site and a pristine site with no history of contamination had the ability to degrade pentachlorophenol (PCP) in anaerobic enrichment cultures. Increasing concentrations of PCP in nitrate, sulfate and yeast …
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The Isolation and Characterization of Hydrocarbon Utilizing Microorganisms
No abstract prepared.
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Micro fluidic cytometry for analysis of marine microorganisms
Knowledge of the distribution and concentration of phytoplankton (microscopic algae that live in the oceans) is important, as this reflects and may modify environmentally important events such as pollution, climate change and carbon dioxide sequestration. Optical based flow cytometry has proved to …
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Isolation of novel antibiotic producing microorganisms from invertebrates
… there is an increasing need to isolate new microorganisms producing new antibiotics. Because conventional sources such as soil have been exhausted, attention has been turned to unexplored sources. The aims of this research were to investigate terrestrial and aquatic invertebrates as a source …
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Competition and Persistence of Microorganisms in the Gradostat
… some answers to the question of which species of microorganisms can coexist and which can not in a spacial heterogeneous environment, called a gradostat. The dynamics of m species in n gradostat vessels is described by a system of mn ordinary differential equations. Using the results on the …
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The Macroecology of Microorganisms: From Pattern to Process
Microorganisms are the most ubiquitous, diverse, and functionally important organisms on Earth, yet their ecological patterns, and the underlying causative processes that determine their distributions over large spatial scales, remain poorly understood. Therefore, I test for macroecological …
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