نتایج جستجو برای: uv light irradiation

تعداد نتایج: 505797  

Journal: :Molecular biology of the cell 2000
M Kato T Iwashita K Takeda A A Akhand W Liu M Yoshihara N Asai H Suzuki M Takahashi I Nakashima

The c-RET proto-oncogene encodes a receptor-type tyrosine kinase, and its mutations in the germ line are responsible for the inheritance of multiple endocrine neoplasia type 2A (MEN2A) and 2B (MEN2B). Ret kinases are constitutively activated as a result of MEN2A mutations (Ret-MEN2A) or MEN2B mutations (Ret-MEN2B). Here we demonstrate that UV light (UV) irradiation induces superactivation of th...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1981
I Emerit A M Michelson

Patients who have systemic lupus erythematosus have increased numbers of chromosome breaks and rearrangements correlated with a low molecular weight chromosome-damaging agent that is released from their lymphocytes into the serum. This clastogenic factor also produces chromosome breaks and sister chromatid exchanges in healthy persons' lymphocytes when they are incubated in the presence of lupu...

2014
Tursun Abdiryim Ahmat Ali Ruxangul Jamal Yakupjan Osman Yu Zhang

Poly(3,4-ethylenedioxythiophene)/zinc oxide (PEDOT/ZnO) nanocomposites were prepared by a simple solid-state heating method, in which the content of ZnO was varied from 10 to 20 wt%. The structure and morphology of the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction (XRD), and transmission e...

2003
ALBERT KELNER

The lethal effect of ultraviolet light, k 254 m/z, on Esckerichia toll, Streptomyces griseus, and other microorganisms can be largely prevented if following ultraviolet irradiation the cells are exposed to visible and near-ultraviolet light in the vicinity of 400 m~ (Kelner, 1949 a, 1949 b, 1950). Such light-induced recovery (or pkotoreactivation, pkotore~ersal, or pkotorecwoery) has been confi...

2017
E. H. Alsharaeh Faheem Ahmed M. G. Ghoniem Khalid M. Abu-Salah Damien P. Debecker

A simple microwave-assisted (MWI) wet chemical route to synthesize pure anatase phase titanium dioxide (TiO2) nanoparticles (NPs) is reported here using titanium tetrachloride (TiCl4) as starting material. The as-prepared TiO2 NPs were characterized by electron microscopy, X-ray diffraction, UV/visible absorption spectroscopy, and infrared and Raman spectroscopic techniques. Further modificatio...

2016
Yoshihiro Mizukami

Photochemical reactions of microcystin-LR, a toxic compound produced by some blue green algae, were investigated. Ultraviolet absorption of microcystin-LR was assessed. Time-dependent density functional theory (TDDFT) calculations indicated that absorption peak at 238 nm was mainly due to excitation of electrons from the linear chain structure Adda of microcystin-LR. Irradiation of microcystin-...

2016
Shuai Cao Ye Wang Lin Cao Yu Wang Bingpeng Lin Wei Lan Baocheng Cao

OBJECTIVE Different methods have been utilized to prevent enamel demineralization and other complications during orthodontic treatment. However, none of these methods can offer long-lasting and effective prevention of orthodontic complications or interventions after complications occur. Considering the photocatalytic effect of TiO2 on organic compounds, we hoped to synthesize a novel bracket wi...

Journal: :The Journal of General Physiology 1952
Raymond Latarjet Luis Renato Caldas

1. E. coli, strain K-12, and B. megatherium 899, irradiated in strict but still undefined physiological conditions with certain heavy doses of ultraviolet light, are efficiently restored by catalase, which acts on or fixes itself upon the bacteria in a few minutes. This restoration (C. R.), different from photorestoration, is aided by a little visible light. 2. At 37 degrees the restorability l...

Journal: :The Journal of Experimental Medicine 1989
L A Applegate R D Ley J Alcalay M L Kripke

This study was conducted to explore the involvement of DNA damage in the suppression of contact hypersensitivity (CHS) by UV irradiation. The opossum, Monodelphis domestica, was used because cells of these marsupials have an enzyme that is activated by visible light (photoreactivating enzyme) and repairs ultraviolet radiation (UVR)-induced pyrimidine dimers in DNA. A single dose of 1,500 J/m2 o...

Journal: :Transfusion 2009
Harald Mohr Ute Gravemann Thomas H Müller

BACKGROUND Ultraviolet (UV) light, especially UVC, is germicidal but its ability to penetrate layers of protein containing solutions is poor. This hampers its use to inactivate pathogens in therapeutic fresh plasma (FP). STUDY DESIGN AND METHODS FP units were spiked with lipid-enveloped or nonenveloped viruses. Others were used without spiking. The units were transferred into UV-transparent b...

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