scholarly journals Potential of Solar UV Radiation for Inactivation of Coronaviridae Family Estimated from Satellite Data

2020 ◽  
Author(s):  
Fernanda R.S. Carvalho ◽  
Diamantino V. Henriques ◽  
Osvaldo Correia ◽  
Alois W. Schmalwieser
Keyword(s):  
Uv Radiation ◽  
Satellite Data ◽  
Solar Uv Radiation ◽  
Solar Uv

scholarly journals Biologically effective doses of ambient solar-UV radiation in Indonesia and Japan

2000 ◽  
pp. 123 ◽  
Author(s):  
Nobuo Munakata ◽  
Santoso Cornain ◽  
Ketut Mulyadi ◽  
Masamitsu Ichihashi ◽  
Joedo Prihartono ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Effective Doses

Solar UV radiation variations and their stratospheric and climatic effects

1985 ◽  
Vol 5 (6) ◽  
pp. 145-148 ◽  
Author(s):  
Richard F. Donnelly ◽  
Donald F. Heath
Keyword(s):  
Uv Radiation ◽  
Climatic Effects ◽  
Solar Uv Radiation ◽  
Solar Uv

scholarly journals Interaction between variable solar UV radiation and tropospheric circulations as a possible cause of five year oscillation in Earth rotation

2000 ◽  
pp. 51-56
Author(s):  
P. Jovanovic ◽  
D. Djurovic
Keyword(s):  
Uv Radiation ◽  
Earth Rotation ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Possible Cause

It is shown that Five Year Oscillation in Earth rotation is possibly caused by variable solar UV radiation and a corresponding perturbation mechanism is suggested.

scholarly journals Effects of Solar UV Radiation on Morphology and Photosynthesis of Filamentous Cyanobacterium Arthrospira platensis

2005 ◽  
Vol 71 (9) ◽  
pp. 5004-5013 ◽  
Author(s):  
Hongyan Wu ◽  
Kunshan Gao ◽  
Virginia E. Villafañe ◽  
Teruo Watanabe ◽  
E. Walter Helbling
Keyword(s):  
Solar Radiation ◽  
Cell Density ◽  
Uv Radiation ◽  
Time Scales ◽  
Morphological Development ◽  
Filamentous Cyanobacterium ◽  
Solar Uv Radiation ◽  
Solar Uv ◽  
Adaptive Time ◽  
The Impact

ABSTRACT To study the impact of solar UV radiation (UVR) (280 to 400 nm) on the filamentous cyanobacterium Arthrospira (Spirulina) platensis, we examined the morphological changes and photosynthetic performance using an indoor-grown strain (which had not been exposed to sunlight for decades) and an outdoor-grown strain (which had been grown under sunlight for decades) while they were cultured with three solar radiation treatments: PAB (photosynthetically active radiation [PAR] plus UVR; 280 to 700 nm), PA (PAR plus UV-A; 320 to 700 nm), and P (PAR only; 400 to 700 nm). Solar UVR broke the spiral filaments of A. platensis exposed to full solar radiation in short-term low-cell-density cultures. This breakage was observed after 2 h for the indoor strain but after 4 to 6 h for the outdoor strain. Filament breakage also occurred in the cultures exposed to PAR alone; however, the extent of breakage was less than that observed for filaments exposed to full solar radiation. The spiral filaments broke and compressed when high-cell-density cultures were exposed to full solar radiation during long-term experiments. When UV-B was screened off, the filaments initially broke, but they elongated and became loosely arranged later (i.e., there were fewer spirals per unit of filament length). When UVR was filtered out, the spiral structure hardly broke or became looser. Photosynthetic O2 evolution in the presence of UVR was significantly suppressed in the indoor strain compared to the outdoor strain. UVR-induced inhibition increased with exposure time, and it was significantly lower in the outdoor strain. The concentration of UV-absorbing compounds was low in both strains, and there was no significant change in the amount regardless of the radiation treatment, suggesting that these compounds were not effectively used as protection against solar UVR. Self-shading, on the other hand, produced by compression of the spirals over adaptive time scales, seems to play an important role in protecting this species against deleterious UVR. Our findings suggest that the increase in UV-B irradiance due to ozone depletion not only might affect photosynthesis but also might alter the morphological development of filamentous cyanobacteria during acclimation or over adaptive time scales.

Spore dosimetry of solar UV radiation: applications to monitoring of daily irradiance and personal exposure

2000 ◽  
Vol 26 (12) ◽  
pp. 1995-2003 ◽  
Author(s):  
N. Munakata ◽  
K. Makita ◽  
D. Bolsée ◽  
D. Gillotay ◽  
G. Horneck
Keyword(s):  
Uv Radiation ◽  
Personal Exposure ◽  
Solar Uv Radiation ◽  
Solar Uv
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