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Filtering by: Subject Microorganisms -- Effect of radiation on Remove constraint Subject: Microorganisms -- Effect of radiation on Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • 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:
    Media on Radiation Resistance 48 Relative Effect of Growth and Recovery Medium on Radiation

  • The response of nitrifying bacteria to treatments of N-Serve and Roundup in continuous-flow soil columns

    Creator:
    Rhodes, Albert N.
    Abstract:
    This study examined the effects of Roundup [N-(phosphonomethyl) glycine] and N-Serve [2-chloro-6- (trichloromethyl) pyridine] on nitrifying organisms in static batch, perfusion soil columns, and a new continuous-flow soil column system. The continuous-flow method is new to nitrification studies and was shown to produce greater nitrifier activity than either static batch...
    Resource Type:
    Masters Thesis
    Full Text:
    Prosser (1987), on the other 10 hand, examined the effect of surface specificity and attachment on

  • Dose to the female breast from nuclear medicine and diagnostic radiology

    Creator:
    Patel, Aarti
    Abstract:
    There has been increased concern about radiation dose to the female breasts, with approximately 200,000 new breast cancers being diagnosed each year in the United States. The unprecedented increase in the use of radiologic exams on younger women has also raised some additional concerns about how procedures are performed. The...
    Resource Type:
    Masters Thesis
    Full Text:
    Patel for the degree of Master of Science in Radiation Health Physics presented on July 18,2008

  • Ultraviolet radiation as an environmental stressor of amphibians

    Creator:
    Bancroft, Betsy A.
    Abstract:
    My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB...
    Resource Type:
    Dissertation
    Full Text:
    radiation on survival ……………………………….. 57 2.3 The effect of UVB radiation on growth ………………………………… 58 2.4

  • The site of action of radio-lethal compounds on Micrococcus radiodurans

    Creator:
    Manes, Jasper Damon, Jr.
    Abstract:
    Iodoacetic acid and diphenylamine were used in this study to elucidate the mechanisms of resistance of Micrococcus radiodurans to radiation. This organism, a gram positive, non-spore forming, salmon-pink, tetracoccus has a LD₅₀ of 213,000 R when grown in the absence of radio-modifying agents. M. radiodurans, when grown in media containing...
    Resource Type:
    Masters Thesis
    Full Text:
    2 Effect of Ultraviolet Light and X -rays on Micro- organisms 3 Modification of Radiation

  • A comparison of radiation induced lipid changes in Micrococcus radiodurans, Sarcina lutea, and Pseudomonas aeruginosa

    Creator:
    Ley, Ronald Douglas
    Abstract:
    Quantity variations in pigments and lipid classes were determined following γ-irradiation of Micrococcus radiodurans, Sarcina lutea, and Pseudomonas aeruginosa. Pigmentation was determined by extraction with organic solvents and measured as optical density at 475 mμ for M. radiodurans and S. lutea, and 410 mμ for Ps. E aetuginosa. Pigments of...
    Resource Type:
    Masters Thesis
    Full Text:
    effect of y- radiation on lipid classes of M. radiodurans, S. lutea, and Ps. aeruginosa. Quantitative

  • Reduction of microbial population of seafood by radiation pasteurization

    Creator:
    East, Dorothy May
    Resource Type:
    Masters Thesis
    Full Text:
    provide information on the usefulness of pasteurization radiation for fishery products. In this regard

  • Design techniques for radiation hardened-phase locked loops

    Creator:
    Nemmani, Anantha Nag
    Abstract:
    Spacecrafts experience radiation in the course of their operation and all electronic equipment on board these spacecrafts has to be designed to withstand the effects of this radiation. This thesis describes the effects of total ionization dose (TID) and single event transients (SET) in phase-locked loops - an important circuit...
    Resource Type:
    Masters Thesis
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 EFFECTS OF RADIATION ON PHASE-LOCKED LOOPS . . . . . . . . . . . . 3 2.1 Effect of total

  • Growth and development of tetracycline resistant Chlamydia suis

    Creator:
    Lenart, Jennifer
    Abstract:
    Tetracycline is a front line antibiotic for the treatment of chlamydial infections in both humans and animals, and the emergence of tetracycline resistant (tet[superscript R]) Chlamydia is of significant clinical importance. Recently, several tet[superscript R] chlamydial strains have been isolated from swine (Sus scrofa) raised in production facilities in Nebraska....
    Resource Type:
    Masters Thesis
    Full Text:
    Microbiology presented on June 28. 2001. Title: Growth and Development of Tetracycline Resistant Chiamydia

  • Physiological studies on radiation resistant bacteria occurring in food

    Creator:
    Duggan, Dennis Edward
    Resource Type:
    Dissertation
    Full Text:
    Effecta on Matter • 5 Radiation Chemist17 • • • • • • • • • • • • • 7 Effects of Ionizing Radiati on