THE EFFECTS OF ULTRAVIOLET RADIATION ON THE INFECTIVE STAGES OF TRICHOSTRONGYLUS RETORTAEFORMIS ZEDER (NEMATODA)

1961 ◽  
Vol 39 (2) ◽  
pp. 137-142
Author(s):  
S. P. Gupta
Keyword(s):  
Ultraviolet Radiation ◽  
Lethal Effect ◽  
Near Ultraviolet ◽  
Far Ultraviolet

The effects of three ranges of ultraviolet radiation on larvae of Trichostrongylus retortaeformis have been studied. It is shown that the far ultraviolet has a quickly lethal effect on the larvae, the middle ultraviolet has a much lessened effect, and the near ultraviolet has practically no effect. Larvae not killed by the ultraviolet radiation develop normally in rabbits.

Qualitative and quantitative effects of radiation on pycnidial formation by Dendrophoma obscurans

1976 ◽  
Vol 54 (7) ◽  
pp. 566-571 ◽  
Author(s):  
Frank L. Binder ◽  
V. G. Lilly
Keyword(s):  
Ultraviolet Radiation ◽  
Casein Hydrolysate ◽  
Qualitative And Quantitative ◽  
Near Ultraviolet ◽  
Blue Radiation ◽  
Age Dependent ◽  
Dendrophoma Obscurans ◽  
Effects Of Radiation ◽  
Far Ultraviolet

Cultures of Dendrophoma obscurans grown on a 10:2 glucose: casein hydrolysate medium require radiation for sporulation. Far-ultraviolet (253.7 nm), near-ultraviolet (300–425 nm), and blue radiation (400–525 nm) were effective in initiating pycnidial formation. Exposure of cultures to radiation from 500 to 850 nm did not induce sporulation. Pycnidial formation was found to be photoinduced and age dependent. Low intensities of near-ultraviolet radiation administered over long durations were more effective than high intensities of short durations for inducing pycnidial formation.

scholarly journals Solar Extreme and Far Ultraviolet Radiation Modeling for Aeronomic Calculations

2021 ◽  
Vol 13 (8) ◽  
pp. 1454
Author(s):  
Anatoliy A. Nusinov ◽  
Tamara V. Kazachevskaya ◽  
Valeriya V. Katyushina
Keyword(s):  
Ultraviolet Radiation ◽  
Input Parameter ◽  
Solar Spectrum ◽  
Upper Atmosphere ◽  
Model Calculations ◽  
Radiation Fluxes ◽  
Main Components ◽  
Comparison Of The Results ◽  
Far Ultraviolet ◽  
Radiation Modeling

Modeling the upper atmosphere and ionospheres on the basis of a mathematical description of physical processes requires knowledge of ultraviolet radiation fluxes from the Sun as an integral part of the model. Aeronomic models of variations in the radiation flux in the region of extreme (EUV) and far (FUV) radiation, based mainly on the data of the last TIMED mission measurements of the solar spectrum, are proposed. The EUVT model describes variations in the 5–105 nm spectral region, which are responsible for the ionization of the main components of the earth’s atmosphere. The FUVT model describes the flux changes in the 115–242 nm region, which determines heating of the upper atmosphere and the dissociation of molecular oxygen. Both models use the intensity of the hydrogen Lyman-alpha line as an input parameter, which can currently be considered as one of the main indices of solar activity and can be measured with relatively simpler photometers. A comparison of the results of model calculations with observations shows that the model error does not exceed 1–2% for the FUVT model, and 5.5% for EUVT, which is sufficient for calculating the parameters of the ionosphere and thermosphere.

Ocular Effects of Near Ultraviolet Radiation

1977 ◽  
Vol 54 (8) ◽  
pp. 542-559 ◽  
Author(s):  
DONALD G. PITTS ◽  
ANTHONY P. CULLEN ◽  
PIERRETTE D. HACKER
Keyword(s):  
Ultraviolet Radiation ◽  
Near Ultraviolet

Near-Ultraviolet Radiation Suppresses Pineal Melatonin Content*

Endocrinology ◽  
1986 ◽  
Vol 119 (5) ◽  
pp. 2201-2205 ◽  
Author(s):  
GEORGE C. BRAINARD ◽  
PATRICIA L. PODOLIN ◽  
SANDER W. LEIVY ◽  
MARK D. ROLLAG ◽  
CURTIS COLE ◽  
...  
Keyword(s):  
Ultraviolet Radiation ◽  
Pineal Melatonin ◽  
Near Ultraviolet

scholarly journals Effect of Near-ultraviolet Radiation on the Responsibility of Antioxidative Function of Orchid Leaves

2005 ◽  
Vol 17 (4) ◽  
pp. 192-198
Author(s):  
Xiheng ZHAO ◽  
Jincai LI ◽  
Shuichiro MATSUI ◽  
Shigenori MAEZAWA
Keyword(s):  
Ultraviolet Radiation ◽  
Antioxidative Function ◽  
Near Ultraviolet

scholarly journals Globular clusters in the outer halo of M 31

2019 ◽  
Vol 623 ◽  
pp. A65 ◽  
Author(s):  
Song Wang ◽  
Jun Ma ◽  
Jifeng Liu
Keyword(s):  
Globular Clusters ◽  
Selection Effect ◽  
Population Synthesis ◽  
Clear Trend ◽  
Intermediate Band ◽  
Near Ultraviolet ◽  
Poor Group ◽  
History Of ◽  
M 31 ◽  
Far Ultraviolet

In this paper, we present photometry of 53 globular clusters (GCs) in the M 31 outer halo, including the GALEX far-ultraviolet (FUV) and near-ultraviolet (NUV), SDSS ugriz, 15 intermediate-band filters of BATC, and 2MASS JHKs bands. By comparing the multicolour photometry with stellar population synthesis models, we determine the metallicities, ages, and masses for these GCs, aiming to probe the merging/accretion history of M 31. We find no clear trend of metallicity and mass with the de-projected radius. The halo GCs younger than ∼8 Gyr are mostly located at the de-projected radii around 100 kpc, but this may be due to a selection effect. We also find that the halo GCs have consistent metallicities with their spatially associated substructures, which provides further evidence of the physical association between them. Both the disc and halo GCs in M 31 show a bimodal luminosity distribution. However, we should emphasise that there are more faint halo GCs which are not seen in the disc. The bimodal luminosity function of the halo GCs may reflect a different origin or evolution environment in their original hosts. The M 31 halo GCs include one intermediate metallicity group (−1.5 < [Fe/H] < −0.4) and one metal-poor group ([Fe/H] < −1.5), while the disc GCs have one metal-rich group more. There are considerable differences between the halo GCs in M 31 and the Milky Way (MW). The total number of GCs in M 31 is approximately three times greater than in the MW, however M 31 has about six times more halo GCs than the MW. Compared to the halo GCs of M 31, those of the MW are mostly metal-poor. Both the numerous halo GCs and the higher-metallicity component are suggestive of an active merger history of M 31.

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