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 40 for “"Microbial production"”.
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate
… on an alternative pathway of DMS formation: microbial cleavage of dissolved (extracellular) DMSP. In laboratory studies, bacteria able to cleave DMSP to form DMS were isolated from seawater by a DMSP enrichment technique, and the kinetics of DMSP uptake and DMS production were examined …
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Studies on the microbial production of acrylic acid
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nutrition and Food Science, 1980.
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Microbial production and consumption of marine dissolved organic matter
… the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are limited, and few definitive connections have been made between specific producers and consumers. …
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Combinatorial biosynthetic pathway engineering for microbial production of biofuels
… and diverse. Effective and economical production of biofuels comes from the optimization of the biosynthetic pathway. We investigated and developed new combinatorial strategies for the optimization of the cellobiose utilization pathway, a pathway which is important in biofuel …
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Microbial production and consumption of marine dissolved organic matter
… the organic substrate responsible for secondary production by heterotrophic microbes in the sea. Despite the importance of DOM in marine food webs, details regarding how marine microbes cycle DOM are limited, and few definitive connections have been made between specific producers and consumers. …
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Genetic Enhancement of Microbial Production of 2,3-Butanediol (Bacillus Polymyxa)
… was the genetic enhancement of 2,3-butanediol production by Bacillus polymyxa. Mutagenesis and cloning techniques were studied.
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Continuous Microbial Production of 2,3-Butylene Glycol From Cheese Whey Permeate
… the regulatory mechanism governing glycol production for both organisms are similar. 2,3-Butylene glycol production is suggested to be a survival mechanism which limits the build-up of toxic metabolites in the medium. Different acetate levels were found to be optimal for increased glycol …
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Marine microbial production of dimethylsulfide from dissolved dimethylsulfoniopropionate by Kathleen Mei Ledyard.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Oxygen, pH, and labile organic carbon as possible mechanisms for algal stimulation of bacterial and fungal production in periphyton
<p>Algal photosynthesis can stimulate production of associated microbial heterotrophs; however,the mechanisms for this stimulation remain unknown. I incubated submerged Typha domingensis leaf litter in greenhouse mesocosms under low- and high-nutrient regimes and conducted microbial production …
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The effects of light level and temperature on freshwater microbial biomass, production, enzyme activity, and community composition
<p>Algae can stimulate the production of heterotrophic microbes in periphyton communities, but the synergistic effects of light and temperature on this phenomenon are not well understood and have implications on carbon cycling and energy flow. We employed recirculating mesocosms held at different …
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Do Roots Bind Soil? Comparing the Physical and Biological Role of Plant Roots in Streambank Fluvial Erosion
… how the combination of root physical effects, microbial production of EPS, and root effects on the hydrodynamic boundary layer could influence streambank soil erodibility. Specifically, the goal of this research was to quantify the physical and biological effects of roots on streambank fluvial …
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Biosensor-based strategies for improving pathway production in Escherichia coli
Microbial production of chemicals and fuels is an attractive renewable alternative to petroleum-based processes. D-glucaric acid, a Department of Energy top value-added chemical from biomass, is a precursor to polymers such as nylons and used in detergents. An engineered metabolic pathway requiring …
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A Mathematical Model of a Denitrification Metabolic Network in Pseudomonas aeruginosa
… decades. This is a yearly phenomenon that causes microbial production of the greenhouse gas nitrous oxide from denitrification. Complete denitrification is a microbial process of reduction of nitrate to nitrogen gas via nitrite, nitric oxide, and greenhouse gas nitrous oxide. After scanning the …
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Enhance heme biosynthesis in Saccharomyces cerevisiae
This research delves into the enhancement of heme production in Saccharomyces cerevisiae through Adaptive Laboratory Evolution (ALE) and Atmospheric and Room Temperature Plasma (ARTP) mutagenesis, complemented by strategic nutrient supplementation. Despite the theoretical promise of ALE and ARTP to …
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Characterizing uronate dehydrogenase from P. syringae as a step towards expressing a retro-biosynthetically derived glucaric acid pathway in E. coli
… have been designed in this laboratory for the microbial production of glucaric acid. In addition to design, efforts have been made in order to express these pathways inside E. col. For the production of glucaric acid in E. coil, toxicity of this organic acid as well as the uptake efficiency of …
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2,3-butanediol production from cellobiose by engineered Saccharomyces cerevisiae
Production of renewable chemicals from cellulosic biomass is a critical step towards energy sustainability and reduced greenhouse gas emissions. Microbial cells have been engineered for producing fuels and chemicals from cellulosic sugars. Among these chemicals, 2,3-butanediol (2,3-BDO) is a …
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Recovery of Xylitol from Fermentation of Model Hemicellulose Hydrolysates Using Membrane Technology
… hydrolysates by either chemical reduction or microbial fermentation. Current technology for commercial production is based on chemical reduction of xylose or hemicellulose, and xylitol is separated and purified by chromatographic methods. The resultant product is very expensive because of the …
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Lignocellulosic fermentation of Saccharomyces cerevisiae to produce medium chain fatty alcohols
… change have made the need to develop sustainable production practices for biofuels and other chemicals imminent. The development of the green economy has also led to many industries voluntarily improving the sustainability of the products they produce. The microbial production of fatty …
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Globalization of biopharmaceutical manufacturing
… and academia to understand the extent of microbial biomanufacturing activity (total volume, number of facilities, type of facilities) and nature of biomanufacturing activity (complexity of products and processes across both mammalian and microbial production) in different regions of the …
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