Index Catalog // ScholarsArchive@OSU

Exposure to ultraviolet-B radiation : sensitivity evaluation of an important ecological parameter of the marine copepod Acartia clausi

Creator:: Karanas, James J.
Abstract:: The ozone present in the atmosphere filters incident solar ultraviolet (UV) radiation such that only the longer wavelengths of the total UV spectrum emitted by the sun reach the earth's surface. Atmospheric increases in nitrogen oxides and chlorofluoromethanes represent a threat to the existence of this protective screen. As the...
Resource Type:: Masters Thesis
Full Text:: hatching of A. clausi eggs. 31 11 The effect of temperature on development time of A. clausi eggs for two

The effects of ultraviolet irradiation on the photosynthetic apparatus

Creator:: Mantai, Kenneth Edward
Abstract:: The effects of ultraviolet (UV) irradiation on photosynthesis and various partial reactions involving the individual photoreactions of photosynthesis were examined. These reactions included photo-reduction in adapted green algae, Hill reaction, cyclic photophosphorylation, the 520 nm absorbance change and variable-yield fluorescence. The reactions were measured in spinach chloroplasts and isolated chloroplasts...
Resource Type:: Dissertation
Full Text:: totally the system I portion of the absorbance change had no effect on the ability of chloroplasts iso

Some effects of ultraviolet-B radiation (290-320 nm) on unialgal and mixed cultures of two centric diatoms

Creator:: Cavanaugh, William M.
Abstract:: Reduction of stratospheric ozone caused by human perturbation with halocarbon compounds and the consequent increase in mid-wavelength ultraviolet radiation (UV-B radiation. 290-320 nm) reaching the earth's surface could have deleterious ecological effects on marine primary producers. Unialgal and mixed cultures of Thalassiosira pseudonana and Thalassiosira weisflogii were exposed to three...
Resource Type:: Masters Thesis
Full Text:: radiation have a measurable effect on the population growth rates and/or community composition of certain

Effects of near-ultraviolet radiation on changes in the biochemical composition of Verticillium albo-atrum

Creator:: Madarash, George Russell
Abstract:: This study sought a better understanding of the mechanism of the near-ultraviolet inhibition of microsclerotia and pigment formation in the fungus Verticillium albo-atrum Reinke & Berth. by observing changes which occur in certain major biochemical components: lipids, chitin, RNA, DNA, protein carbohydrates, and pigment. The most important finding was that...
Resource Type:: Masters Thesis
Full Text:: reagent. 3 Effect of UV radiation on lipid content of Verticillium albo-atrum. 4 The relative pigment

Recombinagenic and anti-mutagenic processing of UV-light photoproducts by the Escherichia coli methyl-directed mismatch-repair system

Creator:: Feng, Wen-yang
Resource Type:: Dissertation
Full Text:: proposed that the effect reflects function of Mut proteins in a pathway that insures the fidelity of the

Response of estuarine diatom assemblages to ultraviolet-B radiation (290-320 nm)

Creator:: Brooker, Deborah L., Worrest, Robert C.,, and Oregon State University
Abstract:: Artificial substrates colonized by diatoms from Yaquina Estuary, Oregon, were exposed to solar visible radiation and three levels of ultraviolet radiation (UV-B, 290-320 nm). Flow-through microcosms were constructed inside a glasshouse to serve as chambers for the artificial substrates. The artificial substrates were sampled during three spring/summer experiments. Chlorophyll a...
Resource Type:: Technical Report
Full Text:: enhanced levels of UV-B radiation appeared to have a stimulatory effect on the latter parameters. 17. KEY

DNA UV damage-related control of ribonucleotide reductase : possible relationship to mutagenesis and the incidence of and attitudes toward skin cancer in several western nations

Creator:: Stenberg, John C.
Abstract:: Two strains of Escherichia coli were studied to determine the effect of constitutive expression of the SOS DNA damage repair response on the activity of ribonucleotide reductase. Activity of the reductase and cellular deoxynucleoside triphosphate (dNTP) pools were both determined before and after exposure of the cells to ultraviolet radiation....
Resource Type:: Honors College Thesis
Full Text:: Escherichia coli were studied to determine the effect of constitutive expression of the SOS DNA damage repair

Roles for retinoid-X-receptors in solar UV-induced melanocyte homeostasis and melanomagenesis

Creator:: Coleman, Daniel J.
Abstract:: Melanoma is the deadliest form of skin cancer, arising from malignant transformation of pigment-producing melanocytes. The primary risk factor for melanoma and other skin cancers is DNA damage resulting from unprotected solar ultraviolet radiation (UVR). If incorrectly repaired, this damage can result in incorporation of mutations that cause aberrant cell...
Resource Type:: Dissertation
Full Text:: -γ available in the microenvironment which has a negative effect on post-UVR survival of

Difference in prostate cancer rates between the United States and Spain : effect of vitamin D

Creator:: Marvel, Kathryn
Abstract:: Prostate cancer is the most commonly diagnosed cancer in men, but rates around the world vary greatly. Americans have the highest incidence rates in the world, 4 to 5 times those of Spain. The hypothesis of this thesis was that vitamin D metabolism is a factor in prostate cancer development...
Resource Type:: Honors College Thesis

ScholarsArchive@OSU

Exposure to ultraviolet-B radiation : sensitivity evaluation of an important ecological parameter of the marine copepod Acartia clausi

The effects of ultraviolet irradiation on the photosynthetic apparatus

Some effects of ultraviolet-B radiation (290-320 nm) on unialgal and mixed cultures of two centric diatoms

Effects of near-ultraviolet radiation on changes in the biochemical composition of Verticillium albo-atrum

Recombinagenic and anti-mutagenic processing of UV-light photoproducts by the Escherichia coli methyl-directed mismatch-repair system

Response of estuarine diatom assemblages to ultraviolet-B radiation (290-320 nm)

DNA UV damage-related control of ribonucleotide reductase : possible relationship to mutagenesis and the incidence of and attitudes toward skin cancer in several western nations

Roles for retinoid-X-receptors in solar UV-induced melanocyte homeostasis and melanomagenesis

Difference in prostate cancer rates between the United States and Spain : effect of vitamin D

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