Results 271 to 280 of about 867,653 (320)

UV-B radiation and acclimation in timberline plants

Environmental Pollution, 2005
Research has shown that some plants respond to enhanced UV-B radiation by producing smaller and thicker leaves, by increasing the thickness of epidermis and concentration of UV-B absorbing compounds of their surface layers and activation of the antioxidant defence system.
Minna, Turunen, Kirsi, Latola
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UV-B Radiation and the Photosynthetic Process

1994
Continuing 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, Cen, Y-P, Ålenius, C, Bornman, Janet   +3 more
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UV-B Radiation and Photoimmunology

1994
Irradiation 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
openaire   +1 more source

Nitric Oxide and UV-B Radiation

2015
Over 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, Yuliya A. Krasylenko, Yaroslav B. Blume   +2 more
openaire   +1 more source

Changes in blood platelets exposed to UV-B radiation

Journal of Photochemistry and Photobiology B: Biology, 1999
The 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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Crop Responses to Enhanced UV-B Radiation

2009
The Earth’s climate has always been changing. Recent observations indicate that the changes are occurring faster and greater than those in the past. Consequently, the main scientific concern is with the ability of organisms to cope with these changes, especially terrestrial plants and crops that are sessile.
B. Breznik, M. Germ, I. Kreft, A. Gaberščik   +3 more
openaire   +1 more source

The effects of increased exposure time to UV-B radiation on germination and seedling development of Anatolian black pine seeds

Environmental Monitoring & Assessment, 2021
H. Ozel, Adel Easa Saad Abo Aisha, M. Çetin, Hakan Şevik, İ. Zeren Çetin   +4 more
semanticscholar   +1 more source

Effect of UV-B radiation on some common antibiotics

Toxicology in Vitro, 2002
Some 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, R B, Misra, M, Farooq, R K, Hans   +3 more
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Solar UV-B radiation measurement over Bahrain

Renewable Energy, 1992
Abstract Solar ultraviolet-B radiation measurements of wavelength interval 295–385 nm were made between 1985 and 1989 using an Eppley Ultraviolet Radiometer. Total solar radiation was also measured during the same period. It is seen from the measurements that during the last three years there is a gradual decrease of UV-B radiation over Bahrain.
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The ratio UV-B/photosynthetically active radiation (PAR) determines the sensitivity of rye to increased UV-B radiation

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
openaire   +1 more source