Search Constraints

Start Over
Filtering by: Has journal Journal of Food Protection Remove constraint Has journal: Journal of Food Protection Degree Field Microbiology Remove constraint Degree Field: Microbiology Degree Name Doctor of Philosophy (Ph.D.) Remove constraint Degree Name: Doctor of Philosophy (Ph.D.)

Search Results

  • Improved detection methods and physiological studies of staphylococcal enterotoxin

    Creator:
    Kimble, Charles E.
    Abstract:
    The purpose of this study was to develop means to facilitate the detection of staphylococcal enterotoxin and to elucidate factors that influence enterotoxin formation. It was found that semipurification flat-gel electrophoresis in a water-cooled apparatus was more efficient than CM-cellulose and Sephadex column chromatography currently used to separate toxin from...
    Resource Type:
    Dissertation
    Full Text:
    from food slurries to which it had beep -,dcled in known quantities by use of carboxy- methyftellulose

  • Ecophylogenetic Characterization of the Gut Microbiome of At-risk Companion and Food Animals

    Creator:
    Kirchoff, Nicole S.
    Abstract:
    Agricultural and companion animals are integral to our way of life as they provide us with nourishment, financial resources, transportation, and companionship. However, pets, managed animals in the agricultural industry, as well as wild populations of food animals are all subject to health and mortality risks. The gut microbiome is...
    Resource Type:
    Dissertation
    Full Text:
    : Ecophylogenetic Characterization of the Gut Microbiome of At-risk Companion and Food Animals Abstract

  • Studies on the inhibition of food-borne pathogens and spoilage bacteria by lactic acid starter cultures

    Creator:
    Daly, Charles
    Abstract:
    The ability of Streptococcus diacetilactis to inhibit a variety of food-borne pathogens and spoilage organisms in milk and broth cultures was demonstrated. Test organisms inhibited included Pseudomonas and Alcaligenes species, Eschericia coli, Salmonella, Staphylococcus aureus, Clostridium perfringens and Vibrio parahaemolyticus. In general, approximately 99.0% and 99.9% inhibition was observed in...
    Resource Type:
    Dissertation
    Full Text:
    Studies on the inhibition of food-borne pathogens and

  • Significance of pigments in radiation resistance of Micrococcus radiodurans

    Creator:
    Krabbenhoft, Kenneth Louis
    Abstract:
    An ecological study of a microorganism similar to that isolated in 1956 and designated as Micrococcus radiodurans indicated that the organism could be isolated from several different environments. By taking advantage of its radio-resistivity, high levels of gamma radiation were used in the isolation procedures to inactivate most of the...
    Resource Type:
    Dissertation
    Full Text:
    1 REVIEW OF LITERATURE 4 Radiation - Use in Food Microbiology 4 Ionizing Radiation 5

  • Novel Experimental Designs and Mathematical Models to Study Fecal Indicator Bacteria Persistence in Surface Water

    Creator:
    Brooks, Lauren
    Abstract:
    High counts of fecal indicators, used to signal the potential presence of pathogens associated with untreated waste, result in the classification of water bodies throughout the United States as impaired. Nonpoint sources of unknown origin that contribute to fecal contamination make management of impaired waters challenging, as they are difficult...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Lauren Brooks

  • Bacterial Predation in Host Microbiomes

    Creator:
    Welsh, Rory M.
    Abstract:
    In host-associated microbiomes, the mechanisms that regulate community composition or the principles that govern dynamics remain far from clear. However, understanding how the structure of microbial communities shift as the system moves away from a healthy state is critical to assessing disease progression and to formulate any potential mitigation strategy....
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Rory M. Welsh for the degree of Doctor of Philosophy in

  • Oral and parenteral immunization for the control of Vibrio anguillarum, the etiological agent of vibriosis in salmonid fish

    Creator:
    Rohovec, J. S.
    Abstract:
    Efficacious vaccines were developed for the control of Vibrio anguillarum, the etiological agent of vibriosis in salmonid fish. These bacterins can be administered either orally or parenterally. It was determined that both formalin-killed lyophilized whole cells and wet-packed whole cells of the organism are effective oral immunogens. Intraperitoneal injection of...
    Resource Type:
    Dissertation
    Full Text:
    of providing protection to fish exposed to natural challenge with V. anguillarum. Oral vaccines

  • Factors affecting the Ceratomyxa shasta infectious cycle and transmission between polychaete and salmonid hosts

    Creator:
    Bjork, Sarah J.
    Abstract:
    Ceratomyxa shasta is a myxozoan parasite that infects salmonid fishes causing the disease ceratomyxosis that is characterized by severe hemorrhage and necrosis of the intestine and death of the fish host. Ceratomyxa shasta is endemic to the Pacific Northwestern United States and Canada, where epizootics are reported for both wild...
    Resource Type:
    Dissertation
    Full Text:
    strategy in fish as a means of protection against pathogens. Increased bactericidal activities were

  • Recombinant vaccines against infectious hematopoietic necrosis virus : bacterial systems for vaccine production and delivery

    Creator:
    Simon, Benjamin E.
    Abstract:
    Several systems were examined for the production and delivery of recombinant vaccines for fish. C. crescentus was employed to produce a fragment of the IHNV glycoprotein. When administered by injection to 0.5 gram rainbow trout (Oncorhynchus mykiss), one of the fusion proteins (184 amino acids of the IHNV glycoprotein fused...
    Resource Type:
    Dissertation
    Full Text:
    strains: Differential staining 131 4.4 Invasiveness of I'. ruckeri strains: Gentamicin protection assay

  • Fecal Bacteroidetes host distributions and environmental source tracking

    Creator:
    Dick, Linda K.
    Abstract:
    Contamination of recreational and shellfish waters with fecal pollution is a major water quality issue with associated economic impacts and human health risks. Reliable fecal source identification and rapid, quantitative analyses are essential components of risk assessment. Enteric bacteria that are endemic to specific hosts have a potential role as...
    Resource Type:
    Dissertation
    Full Text:
    . Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection (GESAMP). United