Results 61 to 70 of about 3,364,184 (247)

UV radiation limited the expansion of cyanobacteria in early marine photic environments

Nature Communications, 2018
Prior to atmospheric oxygenation, ecosystems were exposed to higher UV radiation fluxes relative to modern surface environments. Iron–silica mineral coatings have been evoked as effective UV radiation shields in early terrestrial settings.
Aleksandra M. Mloszewska, D. Cole, N. Planavsky, A. Kappler, Denise S. Whitford, G. Owttrim, K. Konhauser   +6 more
semanticscholar   +1 more source

The Effect of Ultraviolet (UV) Radiation Duration on Drug Susceptibility Testing of Rhizopus spp. to Amphotericin B, Itraconazole and Fluconazole

Majallah-i Dānishgāh-i ’Ulūm-i Pizishkī-i Shahīd Ṣadūqī Yazd, 2014
Introduction: Ultraviolet (UV) radiation is used as a disinfectant in laboratories and hospitals which its efficacy level depends on duration of radiation.
H Nowrozi, A kazemi
doaj  

Effects of UV-B radiation intensity and timing on epidemiological components of wheat stripe rust

Journal of Integrative Agriculture, 2018
Stripe rust caused by Puccinia striiformis f. sp. tritici is an important wheat disease worldwide that is greatly influenced by environmental conditions.
Hui WANG, Feng QIN, Pei CHENG, Zhan-hong MA, Hai-guang WANG   +4 more
doaj   +1 more source

On the importance of local sources of radiation for quasar absorption line systems

, 2006
A generic assumption of ionization models of quasar absorption systems is that radiation from local sources is negligible compared with the cosmological background. We test this assumption and find that it is unlikely to hold for absorbers as rare as H I
Bergeron J., Joop Schaye, Peroux C., Zuo L.   +3 more
core   +1 more source

Mutation accumulation under UV radiation in Escherichia coli

Scientific Reports, 2017
Mutations are induced by not only intrinsic factors such as inherent molecular errors but also by extrinsic mutagenic factors such as UV radiation. Therefore, identifying the mutational properties for both factors is necessary to achieve a comprehensive ...
Atsushi Shibai, Yusuke Takahashi, Yuka Ishizawa, D. Motooka, S. Nakamura, Bei-Wen Ying, Saburo Tsuru   +6 more
semanticscholar   +1 more source

Evaporating Very Small Grains as tracers of the UV radiation field in Photo-dissociation Regions

, 2012
Context. In photo-dissociation regions (PDRs), Polycyclic Aromatic Hydrocarbons (PAHs) could be produced by evaporation of Very Small Grains (VSGs) by the impinging UV radiation field from a nearby star. Aims. We investigate quantitatively the transition
Berné, O., Joblin, C., Montillaud, J., Pilleri, P.   +3 more
core   +3 more sources

Effects of silicate application on CH4 and N2O emissions and global warming potentials in paddy soil under enhanced UV‐B radiation

Energy Science & Engineering, 2019
Enhanced ultraviolet‐B (UV‐B) radiation is induced by the depletion of the stratospheric ozone layer. Silicate is beneficial to rice growth and can increase the resistance of rice plant to UV‐B radiation, but so far few reports have been available on ...
Yunsheng Lou, Lixuan Ren, Sidi Zhao, Yifan Shi, Yiwei Zhang, Huaiwei Zhu   +5 more
doaj   +1 more source

Influence of UV radiation from a massive YSO on the chemistry of its envelope [PDF]

, 2004
We have studied the influence of far ultraviolet (UV) radiation from a massive young stellar object (YSO) on the chemistry of its own envelope by extending the models of Doty et al. (2002) to include a central source of UV radiation.
A. O. Benz, Bakes, Behrend, Beuther, Beuther, Blake, Blake, Boonman, Boonman, Boonman, Ceccarelli, Ceccarelli, Churchwell, Doty, Doty, Doty, Doty, E. F. van Dishoeck, Feigelson, Fuente, Fuente, Gibb, Helmich, Hogerheijde, Hogerheijde, Hollenbach, Hollenbach, J. K. Jørgensen, Jansen, McKee, Meyer, Millar, Mueller, Osorio, P. Stäuber, Pendleton, Preibisch, Rachford, Rodgers, S. D. Doty, Shepherd, Shu, Spaans, Sternberg, Sternberg, Störzer, Teyssier, Tielens, Trinidad, Turner, van Broekhuizen, van der Tak, van der Tak, Walmsley, Wilson   +54 more
core   +3 more sources

Effect of solar and artificial UV radiation on photosynthetic performance and carbonic anhydrase activity in intertidal macroalgae from southern Spain

Ciencias Marinas, 2009
The effect of UV radiation on photosynthetic rate and carbon uptake, estimated as carbonic anhydrase activity, was studied by incubating intertidal algae, Fucus spiralis (Phaeophyta) and Ulva olivascens (Chlorophyta), under both artificial and solar ...
B Viñegla, F López-Figueroa
doaj   +1 more source

Photoprocesses in protoplanetary disks

, 2006
Circumstellar disks are exposed to intense ultraviolet radiation from the young star. In the inner disks, the UV radiation can be enhanced by more than seven orders of magnitude compared with the average interstellar field, resulting in a physical and ...
Aikawa, Augereau, Bastiaan Jonkheid, Bergin, Brittain, Buenker, Calvet, Chiang, Clampin, Connors, D?Alessio, Dent, Draine, Dunning, Dutrey, Ewine F. van Dishoeck, Feigelson, Geers et al., Gorti, Greaves, Gredel, Guest, Habing, Hauschildt, Herbig, Hollenbach, Honjou, Huebner, Jonkheid, Jonkheid, Kamp, Kamp, Kamp, Kessler-Silacci, Kirby, Kirby, Koch, Koch, Lavendy, Lee, Lee, Lee, Lee, Lee, Lepp, Li, Lyons, Marc C. van Hemert, Markwick, Min, Muzerolle, Nee, Nee, Ogawa, Okabe, Pouilly, R?melt, Roberge, Roberge, Shen, Shih, Spaans, St?uber, St?uber, Suto, Suto, Suto, Suto, Sylvester, Theodorakopoulos, Thi, van Boekel, van Dishoeck, van Dishoeck, van Dishoeck, van Dishoeck, van Dishoeck, van Zadelhoff, Watanabe, Weidenschilling, Willacy, Yoshino   +81 more
core   +1 more source