scholarly journals Effects of UV radiation on DNA photodamage and production in bacterioplankton in the coastal Caribbean Sea

1999 ◽  
Vol 20 ◽  
pp. 49-58 ◽  
Author(s):  
PM Visser ◽  
E Snelder ◽  
AJ Kop ◽  
P Boelen ◽  
AGJ Buma ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Caribbean Sea ◽  
Dna Photodamage

Neutrophil Myeloperoxidase Destruction by Ultraviolet Irradiation

1988 ◽  
Vol 46 ◽  
pp. 138-139
Author(s):  
J. Hanker ◽  
B. Giammara ◽  
G. Strauss
Keyword(s):  
Uv Radiation ◽  
Myeloid Leukemia ◽  
Stratospheric Ozone ◽  
Psoriasis Patient ◽  
Whole Body ◽  
Human Neutrophils ◽  
Cupric Nitrate ◽  
The Earth ◽  
Routine Handling ◽  
Uvb Phototherapy

Only a fraction of the UV radiation emitted by the sun reaches the earth; most of the UVB (290-320nm) is eliminated by stratospheric ozone. There is increasing concern, however, that man-made chemicals are damaging this ozone layer. Although the effects of UV on DNA or as a carcinogen are widely known, preleukemia and acute myeloid leukemia (AML) have only rarely been reported in psoriasis patients treated with 8-methoxypsoralen and UV (PUVA). It was therefore of interest to study the effects of UV on the myeloperoxidase (MP) activity of human neutrophils. The peroxidase activity of enriched leukocyte preparations on coverslips was shown cytochemically with a diaminobenzidine medium and cupric nitrate intensification.Control samples (Figs. 1,4,5) of human bloods that were not specifically exposed to UV radiation or light except during routine handling were compared with samples which had been exposed in one of several different ways. One preparation (Fig. 2) was from a psoriasis patient who had received whole-body UVB phototherapy repeatedly.

Investigation of the Effect of Uv-Assisted Oxidation and Nitridation of Hafnium Metal Films

2003 ◽  
Vol 780 ◽  
Author(s):  
C. Essary ◽  
V. Craciun ◽  
J. M. Howard ◽  
R. K. Singh
Keyword(s):  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Grazing Angle ◽  
X Ray Diffraction ◽  
Metal Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Silicon Interface

AbstractHf metal thin films were deposited on Si substrates using a pulsed laser deposition technique in vacuum and in ammonia ambients. The films were then oxidized at 400 °C in 300 Torr of O2. Half the samples were oxidized in the presence of ultraviolet (UV) radiation from a Hg lamp array. X-ray photoelectron spectroscopy, atomic force microscopy, and grazing angle X-ray diffraction were used to compare the crystallinity, roughness, and composition of the films. It has been found that UV radiation causes roughening of the films and also promotes crystallization at lower temperatures.Furthermore, increased silicon oxidation at the interface was noted with the UVirradiated samples and was shown to be in the form of a mixed layer using angle-resolved X-ray photoelectron spectroscopy. Incorporation of nitrogen into the film reduces the oxidation of the silicon interface.

Global Forecast Model to Predict the Daily Dose of the Solar Erythemally Effective UV Radiation¶

2005 ◽  
Vol 81 (1) ◽  
pp. 154 ◽  
Author(s):  
Alois W. Schmalwieser ◽  
Günther Schauberger ◽  
Michal Janouch ◽  
Manuel Nunez ◽  
Tapani Koskela ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Forecast Model ◽  
Daily Dose

Morphological and Photodecomposition Rate Constant Study of PVC Films Doped with Sulfadiazine Tin(IV) Complexes

2020 ◽  
Vol 14 (2) ◽  
pp. 88
Author(s):  
Emad Yousif
Keyword(s):  
Radiation Exposure ◽  
Uv Radiation ◽  
Rate Constant ◽  
Experimental Results

This article focus on the calculation of photodecomposition rate constant of PVC films that containing sulfadiazine tin(IV) complexes 1-3 as photostabilzers during UV radiation exposure. This constant calculated as a method for evaluating the efficiency of sulfadiazine tin(IV) complexes 1-3 when used as a PVC photostabilizers after 300 hours of irradiation. The experimental results showed that sulfadiazine tin(IV) complexes 1-3 have reduced the rate of photodecomposition constant value of PVC films significantly with comparison to PVC (blank).

Sign in / Sign up

Export Citation Format

Share Document