Results 251 to 260 of about 11,614,908 (287)
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A pH/UV-B Synergism in Amphibians
Conservation Biology, 1995Some workers have proposed that synergistic interactions may contribute to the decline and disappearance of amphibians (Blaustein & Wake 1990; Carey 1993; Blaustein et al. 1994a). In this pilot study, we tested the effects of low pH and increased ultraviolet-B radiation (UV-B) on frog-embryo survival. Blaustein et al.
Leslie E, Long +2 more
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Europe’s darker atmosphere in the UV-B
Photochemical & Photobiological Sciences, 2008Irradiation in the ultraviolet wavelength range is found to be up to 50% lower in the European summer compared to sites with comparable latitudes in New Zealand. We have developed a method to quantitatively attribute the causes for such differences between sites by analysis of spectra.
Seckmeyer Gunther +17 more
openaire +4 more sources
1997
UV-B and Aquatic Ecosystems. 1. UV-B Effects in Aquatic Ecosystems D.-P. Hader. 2. UV-damage to Plant Life in a Photobiologically Dynamic Environment: The Case of Marine Phytoplankton W.W.C. Gieskes, A.G.J. Buma. 3. Effects of Acute and Chronic UV-B exposure on a Green Alga: A Continuous Culture Study Using a Computer-Controlled Dynamic Light Regime A.
Rozema, J. +4 more
openaire +3 more sources
UV-B and Aquatic Ecosystems. 1. UV-B Effects in Aquatic Ecosystems D.-P. Hader. 2. UV-damage to Plant Life in a Photobiologically Dynamic Environment: The Case of Marine Phytoplankton W.W.C. Gieskes, A.G.J. Buma. 3. Effects of Acute and Chronic UV-B exposure on a Green Alga: A Continuous Culture Study Using a Computer-Controlled Dynamic Light Regime A.
Rozema, J. +4 more
openaire +3 more sources
Journal of Photochemistry and Photobiology B: Biology, 2001
UV-B absorbance and UV-B absorbing compounds (UACs) of the pollen of Vicia faba, Betula pendula, Helleborus foetidus and Pinus sylvestris were studied. Sequential extraction demonstrated considerable UV-B absorbance both in the soluble (acid methanol) and insoluble sporopollenin (acetolysis resistant residue) fractions of UACs, while the wall-bound ...
Rozema, J. +8 more
openaire +3 more sources
UV-B absorbance and UV-B absorbing compounds (UACs) of the pollen of Vicia faba, Betula pendula, Helleborus foetidus and Pinus sylvestris were studied. Sequential extraction demonstrated considerable UV-B absorbance both in the soluble (acid methanol) and insoluble sporopollenin (acetolysis resistant residue) fractions of UACs, while the wall-bound ...
Rozema, J. +8 more
openaire +3 more sources
UV‐B Biodosimetry in Turfgrass Canopies
Crop Science, 2002Phylloplane microorganisms are affected by ultraviolet (UV) radiation penetrating into plant canopies, but data as to the relationships between microorganism activity and canopy UV levels is lacking. Current instrumentation and modeling systems are inadequate to analyze canopy radiation environments at scales relevant to microorganisms.
G. Y. Yuen +6 more
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Archives of Dermatology, 1984
• The medical uses of nonionizing electromagnetic radiation have changed over time with light source technology and research in photobiology. Multiple UV light phototherapy protocols have been developed. A discussion of the relative importance of light sources with respect to the action spectrum for psoriasis phototherapy, as well as the need for tar ...
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• The medical uses of nonionizing electromagnetic radiation have changed over time with light source technology and research in photobiology. Multiple UV light phototherapy protocols have been developed. A discussion of the relative importance of light sources with respect to the action spectrum for psoriasis phototherapy, as well as the need for tar ...
openaire +1 more source
UV-B Radiation and the Photosynthetic Process
1994Continuing decreases in stratospheric ozone have been documented and it is postulated that this may result in a greater proportion of shortwave ultraviolet radiation (UV-B, 290–320 nm) reaching the earth’s surface. The on-going enlargement of the hole in the ozone in the Antarctic is a particular cause for concern, since the geographical region over ...
Sundby-Emanuelsson, C +3 more
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UV-B doses received during different outdoor activities and UV-B treatment of psoriasis
British Journal of Dermatology, 1982SUMMARY Measurements have been made of the biologically-effective environmental UV-B radiation received by people pursuing a variety of outdoor leisure activities. These UV-B doses have been compared with those received from artificial UV-B radiation by patients undergoing treatment for psoriasis.
B L, Diffey, O, Larkö, G, Swanbeck
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Determination of Phototropism by UV-B Radiation
2019UV-B phototropism in etiolated Arabidopsis seedlings has only been shown recently and needs further exploration. Here we elaborate on how to generate a customized setup with a unilateral UV-B light source, the required plant materials, different growth substrates, and a framework for data analysis.
Lucas, Vanhaelewyn +2 more
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1997
One of the predicted consequences of the depletion of stratospheric ozone is an increase in the amount of ultraviolet light reaching the surface of the earth, in particular UV-B (320–280nm). Although the real effects are as yet unknown, this change in radiation could have profound consequences for plant growth and productivity. The need for information
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One of the predicted consequences of the depletion of stratospheric ozone is an increase in the amount of ultraviolet light reaching the surface of the earth, in particular UV-B (320–280nm). Although the real effects are as yet unknown, this change in radiation could have profound consequences for plant growth and productivity. The need for information
openaire +1 more source