Results 261 to 270 of about 10,674,979 (295)

UV-B and Biosphere

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., Gieskes, W.W.C., van de Geijn, S.C., Nolan, C., de Boois, H.   +4 more
openaire   +3 more sources

UV-B absorbance and UV-B absorbing compounds (para-coumaric acid) in pollen and sporopollenin: the perspective to track historic UV-B levels

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., Broekman, R.A., Blokker, P., Meijkamp, B.B., Bakker, N., van de Staaij, J.W.M., van Beem, A.P., Ariese, F., Kars, S.M.   +8 more
openaire   +3 more sources

UV-B Phototherapy

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 ...
openaire   +1 more source

UV‐B Biodosimetry in Turfgrass Canopies

Crop Science, 2002
Phylloplane 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, C. C. Jochum, L. J. Giesler, M. D. Shulski, E. A. Walter-Shea, K. G. Hubbard, G. L. Horst   +6 more
openaire   +1 more source

Determination of Phototropism by UV-B Radiation

2019
UV-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, Dominique, Van Der Straeten, Filip, Vandenbussche   +2 more
openaire   +2 more sources

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
openaire   +2 more sources

UV-B doses received during different outdoor activities and UV-B treatment of psoriasis

British Journal of Dermatology, 1982
SUMMARY 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
openaire   +2 more sources

Plants and UV-B

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
openaire   +1 more source

Ocular effects of UV-B exposure

Documenta Ophthalmologica, 1995
Although an association between UV-B exposure and ocular damage has been long suspected, this relationship is still not well quantified. Cataract is the most significant ocular damage associated with UV-B exposure. Initial studies of the association between UV-B exposure and cataract were hampered by a lack of precision in the assessment of cataract ...
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UV-B radiation at Penang

Atmospheric Research, 1999
Abstract A new series of measurements including global and UV radiation was initiated in 1994 at Penang. These high quality data were used to study diurnal and seasonal variations. The mean daily total UV-B and global radiation is about 1.43×104 J and 1.77×107 J, respectively.
Mohammad Ilyas, Arunasala Pandy, Syed Idris Syed Hassan   +2 more
openaire   +1 more source