Open Access. Powered by Scholars. Published by Universities.®

Environmental Microbiology and Microbial Ecology Commons™

Open Access. Powered by Scholars. Published by Universities.®

Engineering

Institution
Keyword
Publication Year
Publication
Publication Type

Articles 61 - 65 of 65

Full-Text Articles in Environmental Microbiology and Microbial Ecology

Cellulose Utilization By Clostridium Thermocellum: Bioenergetics And Hydrolysis Product Assimilation, Yi-Heng P. Zhang, Lee R. Lynd May 2005

Cellulose Utilization By Clostridium Thermocellum: Bioenergetics And Hydrolysis Product Assimilation, Yi-Heng P. Zhang, Lee R. Lynd

Dartmouth Scholarship

The bioenergetics of cellulose utilization by Clostridium thermocellum was investigated. Cell yield and maintenance parameters, Y(X/ATP)True = 16.44 g cell/mol ATP and m = 3.27 mmol ATP/g cell per hour, were obtained from cellobiose-grown chemostats, and it was shown that one ATP is required per glucan transported. Experimentally determined values for G(ATP)P-T (ATP from phosphorolytic beta-glucan cleavage minus ATP for substrate transport, mol ATP/mol hexose) from chemostats fed beta-glucans with degree of polymerization (DP) 2-6 agreed well with the predicted value of (n-2)/n [corrected] (n = mean cellodextrin DP assimilated). A mean G(ATP)(P-T) value of 0.52 +/- 0.06 was calculated …

Go to article

An Analysis Of Microbial Contamination In Military Aviation Fuel Systems, Harold W. Graef Mar 2003

An Analysis Of Microbial Contamination In Military Aviation Fuel Systems, Harold W. Graef

Theses and Dissertations

Military aviation fuel systems can be an ideal environment for microorganisms. Microbial growth in hydrocarbon fuel systems arises because of the impracticality of keeping fuel tanks sterile and the inevitable presence of water from condensation. Microbial contaminants in aviation fuel systems are a concern because of their potential to degrade the fuel, accelerate tank corrosion, and threaten flight safety. This research addresses the concern of using more environmentally friendly Fuel System Icing Inhibitors (FSII), which are also biocidal. Are significant levels of microorganisms growing in military aviation fuel systems, and if so, are there any common variables? Forty aviation fuel …

Go to article

Enzyme Profiles Of Pycnoporus Sanguineus Growing In Solid Substrate Fermentation On Selected Agro-Residues, Renuvathani Madavan Jan 2002

Enzyme Profiles Of Pycnoporus Sanguineus Growing In Solid Substrate Fermentation On Selected Agro-Residues, Renuvathani Madavan

Student Works (2000-2009)

A comparative study was done for solid substrate fermentation (SSF) of sago 'hampas', oil palm frond parenchyma tissue (OPFPI) and rubberwood sawdust with a white-rot fungus, Pycnoporus sanguineous for enzyme production. Xylanase, laccase and cellulase productivity was assayed during degradation. Excellent growth of Pycnoporus sanguineous was observed for all the substrates studied over a 21 day time-course fermentation. Laccase productivity was highest during degradation of sago 'hampas' and OPFPI ranging from 7.4-7.6 U/g substrate on 1111 day of fermentation compared to rubberwood sawdust with a maximum laccase of 5.7 U/g substrate on day 11 of SSF. Xylanase productivity recorded highest …

Go to article

Can We Guarantee The Safety Of Genetically Engineered Organisms In The Environment?, Kathleen H. Keeler, Frances E. Sharples Jan 1988

Can We Guarantee The Safety Of Genetically Engineered Organisms In The Environment?, Kathleen H. Keeler, Frances E. Sharples

School of Biological Sciences: Faculty Publications

Can we guarantee the safety of genetically engineered organisms in the environment? To anticipate my remarks, the answer to the title question is “No, we cannot guarantee the safety of genetically engineered organisms released into the environment.” Indeed, it is a tenet of the scientific method that nothing can be proved, only disproved. Thus, we can never show that a release will be safe. We could only show that it would be unsafe, if that were the case. However, if the question is posed differently, for example, can we safely release genetically engineered organisms into the environment?, the answer is …

Go to article

Two Lincoln (Nebraska) Typhoid Fever Epidemics Of 1911 And 1912., Herbert H. Waite Jan 1913

Two Lincoln (Nebraska) Typhoid Fever Epidemics Of 1911 And 1912., Herbert H. Waite

School of Biological Sciences: Faculty Publications

On August 29, 1912, I was requested by the Board of Health of the city of Lincoln to make an investigation to determine if possible the origin and cause of an outbreak of a disease reported as typhoid fever which was then prevailing. This outbreak was said to be most prevalent in one particular portion of the city and consequently attention was turned to that portion. Of the cases reported an investigation was made of over 60 individuals and after considering all the probable causes for the majority of those affected the conclusion was reached that all could be logically …

Go to article

First Prev