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Response to ultraviolet (UV-B) radiation by attached assemblages of estuarine diatoms

Creator:: Brooker, Deborah L.
Abstract:: Global atmospheric pollution from chlorofluorocarbons has the potential of causing significant reductions in the concentrations of stratospheric ozone. If the production of chlorofluorocarbons were to continue into the future at the rate prevalent in 1977, the steady state reduction in total global ozone could be between five percent to ten...
Resource Type:: Masters Thesis
Full Text:: effort to measure the effect of UV-B radiation on the colonization of new substrates by benthic diatoms

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

Effects of ultraviolet-B radiation on marine phytoplankton

Creator:: Behrenfeld, Michael Joseph
Abstract:: Global increases in ultraviolet-B radiation (UVBR:290- 320 nm) resulting from decreases in stratospheric ozone concentration have the potential to alter marine primary production and affect global climate and marine trophic dynamics. Effects of UVBR on phytoplankton carbon fixation were determined from open ocean exposure studies conducted off the coast of...
Resource Type:: Dissertation
Full Text:: in regions of nutrient limitation. Effects of Ultraviolet-B Radiation on Marine Phytoplankton by

Primary productivity in the southeast Pacific Ocean : effects of enhanced ultraviolet-B radiation

Creator:: Behrenfeld, Mike J.
Abstract:: Anthropogenic releases of trace gases into the atmosphere are causing a decrease in stratospheric ozone concentrations and a subsequent increase in solar ultraviolet-B (UV-B)(280-320 nm) radiation reaching the earth's surface. The objective of this study was to determine the acute effects of enhanced UV-B radiation on the primary production of...
Resource Type:: Masters Thesis
Full Text:: photosynthetically active (PAR) (400 - 750 nm) radiation, decrease the effect of UV-B radiation on photosynthesis

Sublethal effects of UV-B radiation on larval amphibians

Creator:: Belden, Lisa K.
Abstract:: Ultraviolet-B radiation (UV-B) has been suggested as a factor contributing to global amphibian population declines. While ambient UV-B levels damage the eggs and embryos of some amphibian species, few studies have addressed how UV-B affects other life history stages or sublethal responses. My dissertation focuses on (1) investigations of sublethal...
Resource Type:: Dissertation

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:: Doctor of Philosothv in Genetics , presented on February 23, 1994. Title: Recombinaaenic and Anti

Individual and population responses to abiotic stresses in Italian ryegrass (Lolium multiflorum Lam.)

Creator:: Martinez-Ghersa, Maria Alejandra
Abstract:: Plant form is a compromise between resource gathering, reproduction and the tolerance to physical demands of the abiotic and biotic environment. In an agricultural field in addition to the natural factors causing stress, humans also introduce physical and mechanical stresses, and chemical pesticides into the environment. Many of these factors...
Resource Type:: Dissertation
Full Text:: .................................................................. 152 4.2 Effect of ultraviolet-B (UVB) radiation on survival of Italian ryegrass seedlings of a

Physiological responses of the marine phytoplankton Dunaliella tertiolecta to UV-B enhanced solar radiation

Creator:: Scott, James Douglas
Resource Type:: Masters Thesis
Full Text:: on biological effects of increased solar ultraviolet radiation. In: Causes and effects of

Effect of ultraviolet and visible radiation on the sporulation of species of Helminthosporium

Creator:: Yadav, Babu Singh
Resource Type:: Dissertation
Full Text:: Effect of ultraviolet and visible radiation on the

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

ScholarsArchive@OSU

Response to ultraviolet (UV-B) radiation by attached assemblages of estuarine diatoms

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

Effects of ultraviolet-B radiation on marine phytoplankton

Primary productivity in the southeast Pacific Ocean : effects of enhanced ultraviolet-B radiation

Sublethal effects of UV-B radiation on larval amphibians

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

Individual and population responses to abiotic stresses in Italian ryegrass (Lolium multiflorum Lam.)

Physiological responses of the marine phytoplankton Dunaliella tertiolecta to UV-B enhanced solar radiation

Effect of ultraviolet and visible radiation on the sporulation of species of Helminthosporium

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

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