نتایج جستجو برای: uva led

تعداد نتایج: 214715  

2016
Olivier Reelfs Vincenzo Abbate Robert C. Hider Charareh Pourzand

Mitochondria are the principal destination for labile iron, making these organelles particularly susceptible to oxidative damage on exposure to ultraviolet A (UVA, 320-400 nm), the oxidizing component of sunlight. The labile iron-mediated oxidative damage caused by UVA to mitochondria leads to necrotic cell death via adenosine triphosphate depletion. Therefore, targeted removal of mitochondrial...

2013
Bin Yin Xian Jiang

INTRODUCTION Photoaging is the superposition of chronic ultraviolet (UV)-induced damage on intrinsic aging. Telomere length is a molecular marker of cell aging, and genomic instability due to telomere shortening has been linked to several aging-related diseases. AIM To explore the effects of different doses of ultraviolet A (UVA) on the length of telomeres in human skin fibroblasts and partly...

2015
Ayumi Kawano Akimitsu Hayakawa Shuji Kojima Mitsutoshi Tsukimoto Hikaru Sakamoto

Ultraviolet A (UVA) radiation, the major UV component of solar radiation, can penetrate easily to the dermis, where it causes significant damage to cellular components by inducing formation of reactive oxygen species (ROS). On the other hand, extracellular ATP is released in response to various stimuli, and activates purinergic P2X7 receptor, triggering ROS production and cell death. Here, we e...

2016
Hyung Jin Hahn Ki Bbeum Kim Seunghee Bae Byung Gon Choi Sungkwan An Kyu Joong Ahn Su Young Kim

BACKGROUND Approximately 90%~99% of ultraviolet A (UVA) ray reaches the Earth's surface. The deeply penetrating UVA rays induce the formation of reactive oxygen species (ROS), which results in oxidative stress such as photoproducts, senescence, and cell death. Thus, UVA is considered a primary factor that promotes skin aging. OBJECTIVE Researchers investigated whether pretreatment with feruli...

2011
Quentin Gueranger Azadeh Kia David Frith Peter Karran

The DNA of patients taking immunosuppressive and anti-inflammatory thiopurines contains 6-thioguanine (6-TG) and their skin is hypersensitive to ultraviolet A (UVA) radiation. DNA 6-TG absorbs UVA and generates reactive oxygen species that damage DNA and proteins. Here, we show that the DNA damage includes covalent DNA-protein crosslinks. An oligonucleotide containing a single 6-TG is photochem...

2010
Ramón de la Rosa Alonso Alonso Albano Carrera Ramón J. Durán Patricia Fernández

This paper presents the UVa-NTS (University of Valladolid Neuromuscular Training System), a multifunction and portable Neuromuscular Training System. The UVa-NTS is designed to analyze the voluntary control of severe neuromotor handicapped patients, their interactive response, and their adaptation to neuromuscular interface systems, such as neural prostheses or domotic applications. Thus, it is...

Journal: :Journal of neurobiology 1993
H Williams D S Vicario

Birdsong is a learned vocal behavior used in intraspecific communication. The motor pathway serving learned vocalizations includes the forebrain nuclei NIf, HVC, and RA; RA projects to midbrain and brain stem areas that control the temporal and acoustic features of song. Nucleus Uvaeformis of the thalamus (Uva) sends input to two of these forebrain nuclei (NIf and HVC) but has not been thought ...

2015
Tanja Stachon Jiong Wang Xufei Song Achim Langenbucher Berthold Seitz Nóra Szentmáry

Riboflavin-UVA photodynamic inactivation is a potential treatment alternative in therapy resistant infectious keratitis. The purpose of our study was to determine the impact of riboflavin-UVA photodynamic inactivation on viability, apoptosis and activation of human keratocytes in vitro. Primary human keratocytes were isolated from human corneal buttons and cultured in DMEM/Ham's F12 medium supp...

2014
Petra Wäster Ida Eriksson Linda Vainikka Karin Öllinger

Solar radiation is an important risk factor for skin cancer, the incidence of which is increasing, especially in the fair-skinned populations of the world. While the ultraviolet (UV)B component has direct DNA damaging ability, UVA-induced effects are currently mainly attributed to the production of reactive oxygen species. In our recent study, we compared the effects of UVA and UVB radiation on...

2005
PAUL C. FROST JAMES H. LARSON LAUREN E. KINSMAN GARY A. LAMBERTI SCOTT D. BRIDGHAM

We measured the attenuation of ultraviolet B (UVB) and ultraviolet A (UVA) radiation in 32 streams located within the Ontonagon River watershed on the Upper Peninsula of Michigan, USA. Attenuation coefficients (Kd) of UVB and UVA ranged widely among these streams, but generally translated into relatively shallow 1% transmission depths into the water column (2–45 cm for UVB and 6–103 cm for UVA)...

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