Results 261 to 270 of about 308,277 (312)
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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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Physiologia Plantarum, 1993
Using quartz optical fibres, penetration of both monochromatic (310 nm) and polychromatic UV‐B (280–320 nm) radiation in leaves of Brassica napus L. (cv. Ceres) was measured. Plants were grown under either visible light (750 μmol m−2 s−1 photosynthetically active radiation) or with the addition of 8.
Cen, Y.-P., Bornman, Janet
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Using quartz optical fibres, penetration of both monochromatic (310 nm) and polychromatic UV‐B (280–320 nm) radiation in leaves of Brassica napus L. (cv. Ceres) was measured. Plants were grown under either visible light (750 μmol m−2 s−1 photosynthetically active radiation) or with the addition of 8.
Cen, Y.-P., Bornman, Janet
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UV-B Radiation and Photoimmunology
1994Irradiation with ultraviolet-B (UV-B, 280–320 nm) initiates a selective immunosuppression which results in a down regulation of cell-mediated immunity. This form of immune suppression may be a fundamental regulatory mechanism, controlling the interaction between mammals and potentially deleterious environmental radiation.
Frances P. Noonan, Edward C. DeFabo
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Signal Transduction in Responses to UV-B Radiation
Annual Review of Plant Biology, 2009UV-B radiation is a key environmental signal that initiates diverse responses in plants that affect metabolism, development, and viability. Many effects of UV-B involve the differential regulation of gene expression. The response to UV-B depends on the nature of the UV-B treatment, the extent of adaptation and acclimation to UV-B, and interaction with
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Changes in blood platelets exposed to UV-B radiation
Journal of Photochemistry and Photobiology B: Biology, 1999The effects of UV-B radiation (312 nm) on the pig-blood platelet secretory process (platelet activation) and platelet lipid peroxidation have been studied. The responses of platelets to UV-B radiation are compared with the response of these cells to thrombin, which is a strong platelet agonist. The obtained results show that exposure of blood platelets
K, Bednarska, B, Wachowicz
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Environmental and Experimental Botany, 1997
Abstract To evaluate the effect of different naturally occurring irradiation conditions on the sensitivity of rye (Secale cereale L.) to increased UV-B levels, plants were grown under eight different light treatments. In the control series (at ambient levels of UV-B), UV-B and visible light were decreased in parallel, resulting in four different ...
G. Deckmyn, I. Impens
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Abstract To evaluate the effect of different naturally occurring irradiation conditions on the sensitivity of rye (Secale cereale L.) to increased UV-B levels, plants were grown under eight different light treatments. In the control series (at ambient levels of UV-B), UV-B and visible light were decreased in parallel, resulting in four different ...
G. Deckmyn, I. Impens
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Nitric Oxide and UV-B Radiation
2015Over the past few years, nitric oxide (NO) has emerged as a key player in plant adaptive/hypersensitive responses to abiotic (stress) factors, since the content of endogenously generated NO increases in adverse environmental conditions. This chapter addresses to the signalling events with the involvement of the reactive nitrogen species under ...
Alla I. Yemets +2 more
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The Tradescantia-micronucleus test on the genotoxicity of UV-B radiation
Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis, 1999Lanzhou city is located in north central China near inner Mongolia. The solar UV-B background radiation in this area is occasionally extremely high (8 microW/cm2). Such high background solar UV-B radiation could be attributed to the sporadic depletion of the ozone layer in the stratosphere.
S, Wang, X, Wang
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Effect of UV-B radiation on some common antibiotics
Toxicology in Vitro, 2002Some of the commonly used antibiotics such as cephaloridine, cephalexin, cephradine, nystatin and nafcillin were tested for generation of singlet oxygen (1O(2)) under UV-B (290-320 nm) exposure and the order for 1O(2) generation was obtained: cephaloridine>cephalexin>nystatin>cephradine>nafcillin.
R S, Ray +3 more
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The impact of UV-B radiation and ozone on terrestrial vegetation
Environmental Pollution, 1994Although terrestrial vegetation has been exposed to UV-B radiation and ozone over the course of evolutionary history, it is essential to view the effects on vegetation of changing levels of these factors in the context of other features of climate change, such as increasing CO(2) levels and changes in temperature and precipitation patterns. Much of our
V C, Runeckles, S V, Krupa
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