keyword
MENU ▼
Read by QxMD icon Read
search

Ultraviolet radiation

keyword
https://www.readbyqxmd.com/read/28646736/cell-damage-caused-by-ultraviolet-b-radiation-in-the-desert-cyanobacterium-phormidium-tenue-and-its-recovery-process
#1
Gaohong Wang, Songqiang Deng, Jiafeng Liu, Chaoran Ye, Xiangjun Zhou, Lanzhou Chen
Phormidium tenue, a cyanobacterium that grows in the topsoil of biological soil crusts (BSCs), has the highest recovery rate among desert crust cyanobacteria after exposure to ultraviolet B (UV-B) radiation. However, the mechanism underlying its recovery process is unclear. To address this issue, we measured chlorophyll a fluorescence, generation of reactive oxygen species (ROS), lipid peroxidation, and repair of DNA breakage in P. tenue following exposure to UV-B. We found that UV-B radiation at all doses tested reduced photosynthesis and induced cell damage in P...
June 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28639816/review-of-interventions-to-reduce-ultraviolet-tanning-need-for-treatments-targeting-excessive-tanning-an-emerging-addictive-behavior
#2
Jerod L Stapleton, Joel Hillhouse, Kristine Levonyan-Radloff, Sharon L Manne
Millions of Americans engage in tanning each year, defined as intentional ultraviolet radiation (UVR) exposure in the form of sunbathing or the use of indoor tanning beds. An emerging body of research suggests that UVR has addictive properties and some tanners engage in excessive tanning. This article provides an overview of the evidence of tanning addiction and a systematic review of existing tanning interventions with the goal of evaluating their potential to impact addicted tanners. Our search identified 24 intervention studies that were summarized and discussed according to 3 primary themes...
June 22, 2017: Psychology of Addictive Behaviors: Journal of the Society of Psychologists in Addictive Behaviors
https://www.readbyqxmd.com/read/28637727/a-protocol-for-prospective-studies-of-25-hydroxyvitamin-d-leptin-and-body-mass-index-in-relation-to-cutaneous-melanoma-incidence-and-survival
#3
Jo Steinson Stenehjem, Tom K Grimsrud, Judith R Rees, Linda Vos, Ronnie Babigumira, Marit B Veierød, Trude Eid Robsahm
INTRODUCTION: The incidence and mortality rates of cutaneous melanoma (CM) are increasing among fair-skinned populations worldwide. Ultraviolet radiation (UVR) is the principal risk factor for CM, but is also the main source of 25-hydroxyvitamin D (25(OH)D), which has been associated with reduced risk and better prognosis of some cancer types. However, both low and high 25(OH)D levels have been associated with increased risk of CM. Obesity as measured by body mass index (BMI) is associated with risk of several cancers and has also been suggested as a risk factor for CM, and may also be related to insufficient 25(OH)D and/or high leptin levels...
June 21, 2017: BMJ Open
https://www.readbyqxmd.com/read/28636748/e-cadherin-mediates-uvr-and-calcium-induced-melanin-transfer-in-human-skin-cells
#4
Suman K Singh, Richard Baker, Stephen K Sikkink, Carine Nizard, Sylvianne Schnebert, Robin Kurfurst, Desmond J Tobin
Skin pigmentation is directed by epidermal-melanin units, characterized by long-lived and dendritic epidermal melanocytes (MC) that interact with viable keratinocytes (KC) to contribute melanin to the epidermis. Previously we reported that MC:KC contact is required for melanosome transfer, that this can be enhanced by filopodial and by UVR/UVA irradiation, which can up-regulate melanosome transfer via Myosin X-mediated control of MC filopodia. Both MC and KC express Ca(2+) -dependent E-cadherins. These homophilic adhesion contacts induce transient increases in intra-KC Ca(2+) , while ultraviolet radiation (UVR) raises intra-MC Ca(2+) via calcium selective ORAI1 ion channels; both are associated with regulating melanogenesis...
June 21, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28635084/primary-tumor-sites-in-relation-to-ultraviolet-radiation-exposure-and-skin-visibility-correlate-with-survival-in-cutaneous-melanoma
#5
Daniela Gordon, Johan Hansson, Sandra Eloranta, Max Gordon, Peter Gillgren, Karin E Smedby
The prognostic value of detailed anatomic site and ultraviolet radiation (UVR) exposure patterns has not been fully determined in cutaneous melanoma. Thus, we reviewed medical records for detailed site in a population-based retrospective Swedish patient cohort diagnosed with primary invasive melanoma 1976 - 2003 (n=5,973). We followed the patients from date of diagnosis until death, emigration or December 31(st) 2013, and evaluated melanoma-specific survival by subsite in a multivariable regression model adjusting for established prognostic factors...
June 20, 2017: International Journal of Cancer. Journal International du Cancer
https://www.readbyqxmd.com/read/28632030/ultraviolet-b-radiation-stimulates-the-interaction-between-nuclear-factor-of-activated-t-cells-5-nfat5-and-nuclear-factor-kappa-b-nf-%C3%AE%C2%BAb-in-human-lens-epithelial-cells
#6
Inyoung Chung, Young-Sool Hah, SunMi Ju, Ji-Hye Kim, Woong-Sun Yoo, Hee-Young Cho, Ji-Myong Yoo, Seong-Wook Seo, Wan-Sung Choi, Seong-Jae Kim
PURPOSE: Nuclear factor-kappa B (NF-κB) has been proposed as a therapeutic target for the treatment of cataracts. The authors investigated the relationship between nuclear factor of activated T cells 5 (NFAT5) and NF-κB in ultraviolet B (UVB)-irradiated human lens epithelial (HLE) cells. METHODS: Human lens epithelial B-3 (HLE-B3) cells were exposed to UVB light at a dose of 10 mJ/cm(2) and then incubated for 24 h. Cell viability was assessed by using the Cell Counting Kit-8 (CCK-8) assay...
February 26, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28631848/impact-of-solar-ultraviolet-radiation-on-atopic-dermatitis-symptoms-in-young-children-a-longitudinal-study
#7
Young-Min Kim, Jihyun Kim, Ji Young Lee, Minji Kim, Hyunmi Kim, Kwon Jung, Soomi Eo, Mijin Ahn, Kangmo Ahn
BACKGROUND: There are controversial data about the effects of sun exposure on atopic dermatitis (AD). We evaluated the association between solar ultraviolet radiation (UVR) exposure and AD symptoms in children. METHODS: Eighty two children under 6 years (48 boys and 34 girls) with AD living in Seoul, Korea were enrolled and followed for 12 months between September 2013 and August 2014. Daily symptoms were recorded to describe the degree of itching, sleep disturbance, erythema, dryness, oozing and edema...
June 20, 2017: Pediatric Allergy and Immunology
https://www.readbyqxmd.com/read/28631363/experimental-evolution-of-bacillus-subtilis
#8
REVIEW
Daniel R Zeigler, Wayne L Nicholson
The endospore-forming bacteria have persisted on earth perhaps 3Ga, leveraging the flexibility of their distinctive lifestyle to adapt to a remarkably wide range of environments. This process of adaptation can be investigated through the simple but powerful technique of laboratory evolution. Evolved strains can be analyzed by whole genome sequencing and an array of omics technologies. The intensively studied, genetically tractable endospore-former, Bacillus subtilis, is an ideal subject for laboratory evolution experiments...
June 19, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28630441/overcoming-the-biological-aging-of-titanium-using-a-wet-storage-method-after-ultraviolet-treatment
#9
Sung-Hwan Choi, Won-Seok Jeong, Jung-Yul Cha, Jae-Hoon Lee, Kee-Joon Lee, Hyung-Seog Yu, Eun-Ha Choi, Kwang-Mahn Kim, Chung-Ju Hwang
We evaluated whether the biological activity of the surface of titanium, when stored in an aqueous solution after ultraviolet (UV) treatment, is comparable to that of the surface immediately after UV treatment. We subjected Grade IV titanium discs with machined surfaces to UV radiation for 15 min and then tested them immediately and after storage for 28 days, with and without distilled H2O (dH2O). We evaluated the surface characteristics using surface profiling, contact angle analysis, X-ray photoelectron spectroscopy, and in terms of the surface zeta-potential...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28628879/development-of-a-method-for-the-characterization-and-operation-of-uv-led-for-water-treatment
#10
Ataollah Kheyrandish, Madjid Mohseni, Fariborz Taghipour
Tremendous improvements in semiconductor technology have made ultraviolet light-emitting diodes (UV-LEDs) a viable alternative to conventional UV sources for water treatment. A robust and validated experimental protocol for studying the kinetics of microorganism inactivation is key to the further development of UV-LEDs for water treatment. This study proposes a protocol to operate UV-LEDs and control their output as a polychromatic radiation source. In order to systematically develop this protocol, the results of spectral power distribution, radiation profile, and radiant power measurements of a variety of UV-LEDs are presented...
June 6, 2017: Water Research
https://www.readbyqxmd.com/read/28628693/understanding-the-role-of-photolyases-photoprotection-and-beyond
#11
Neal Bhatia, Brian Berman, Roger I Ceilley, Leon H Kircik
<p>The limitations of photoprotection modalities have been the inability to arrest the progression of photodamage. Chemoprevention strategies involving a sunscreen has been incomplete because of the need to induce sustained repair of mutations and slow carcinogenesis. Photolyases, or photoreactivation enzymes, serve the role of repairing mutations and damage to DNA induced by ultraviolet (UV) radiation and therefore influence the initiation phases of carcinogenesis. As these enzymes are absent in humans, exogenous forms have been manufactured and are now utilized in topical agents to supplement and augment the innate repair mechanisms that are mostly inefficient...
May 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28621734/the-roles-of-spinochromes-in-four-shallow-water-tropical-sea-urchins-and-their-potential-as-bioactive-pharmacological-agents
#12
Lola Brasseur, Elise Hennebert, Laurence Fievez, Guillaume Caulier, Fabrice Bureau, Lionel Tafforeau, Patrick Flammang, Pascal Gerbaux, Igor Eeckhaut
Spinochromes are principally known to be involved in sea urchin pigmentation as well as for their potentially interesting pharmacological properties. To assess their biological role in sea urchin physiology, experiments are undertaken on crude extracts from four species and on four isolated spinochromes in order to test their antibacterial, antioxidant, inflammatory and cytotoxic activities. First, the antibacterial assays show that the use of crude extracts as representatives of antibacterial effects of spinochromes are inaccurate...
June 16, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28620422/special-considerations-for-vitamin-d-in-the-south-asian-population-in-the-uk
#13
REVIEW
Nicola M Lowe, Issak Bhojani
The human requirement for vitamin D is achieved primarily through the synthesis of this prehormone in the skin during exposure to ultraviolet B (UVB) radiation, with only a minor contribution from the diet, year round. Achieving optimal vitamin D status is therefore largely dependent upon adequate exposure of the skin to sunlight, however, the length of exposure required varies with latitude and season, and is also dependent upon skin pigmentation, with darker skin requiring greater exposure than fair skin due to the protective effects of melanin against UVB radiation...
June 2017: Therapeutic Advances in Musculoskeletal Disease
https://www.readbyqxmd.com/read/28620407/antioxidant-responses-induced-by-uvb-radiation-in-deschampsia-antarctica-desv
#14
Hans Köhler, Rodrigo A Contreras, Marisol Pizarro, Rodrigo Cortés-Antíquera, Gustavo E Zúñiga
Deschampsia antarctica Desv. is one of two vascular plants that live in the Maritime Antarctic Territory and is exposed to high levels of ultraviolet-B (UVB) radiation. In this work, antioxidant physiology of D. antarctica was studied in response to UVB induced oxidative changes. Samples were collected from Antarctica and maintained in vitro culture during 2 years. Plants were sub-cultured in a hydroponic system and exposed to 21.4 kJ m(-2) day(-1), emulating summer Antarctic conditions. Results showed rapid and significant increases in reactive oxygen species (ROS) at 3 h, which rapidly decreased...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28619099/differentiated-demographic-histories-and-local-adaptations-between-sherpas-and-tibetans
#15
Chao Zhang, Yan Lu, Qidi Feng, Xiaoji Wang, Haiyi Lou, Jiaojiao Liu, Zhilin Ning, Kai Yuan, Yuchen Wang, Ying Zhou, Lian Deng, Lijun Liu, Yajun Yang, Shilin Li, Lifeng Ma, Zhiying Zhang, Li Jin, Bing Su, Longli Kang, Shuhua Xu
BACKGROUND: The genetic relationships reported by recent studies between Sherpas and Tibetans are controversial. To gain insights into the population history and the genetic basis of high-altitude adaptation of the two groups, we analyzed genome-wide data in 111 Sherpas (Tibet and Nepal) and 177 Tibetans (Tibet and Qinghai), together with available data from present-day human populations. RESULTS: Sherpas and Tibetans show considerable genetic differences and can be distinguished as two distinct groups, even though the divergence between them (~3200-11,300 years ago) is much later than that between Han Chinese and either of the two groups (~6200-16,000 years ago)...
June 15, 2017: Genome Biology
https://www.readbyqxmd.com/read/28618944/demethoxycurcumin-in-combination-with-ultraviolet-radiation-b-induces-apoptosis-through-the-mitochondrial-pathway-and-caspase-activation-in-a431-and-hacat-cells
#16
Yong Xin, Qian Huang, Pei Zhang, Wen Wen Guo, Long Zhen Zhang, Guan Jiang
Photodynamic therapy is widely used in the clinical treatment of tumors, especially skin cancers. It has been reported that the photosensitizer curcumin, in combination with ultraviolet radiation B, induces HaCaT cell apoptosis, and this effect may be due to the activation of caspase pathways. In this study, we examined the photodynamic effects of demethoxycurcumin, a more stable analogue of curcumin, to determine whether it could induce apoptosis in skin cancer cells. We investigated the effects of a combination of ultraviolet radiation B and demethoxycurcumin on apoptotic cell death in A431 and HaCaT cells and determined the molecular mechanism of action...
June 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28614305/bap1-regulates-ip3r3-mediated-ca-2-flux-to-mitochondria-suppressing-cell-transformation
#17
Angela Bononi, Carlotta Giorgi, Simone Patergnani, David Larson, Kaitlyn Verbruggen, Mika Tanji, Laura Pellegrini, Valentina Signorato, Federica Olivetto, Sandra Pastorino, Masaki Nasu, Andrea Napolitano, Giovanni Gaudino, Paul Morris, Greg Sakamoto, Laura K Ferris, Alberto Danese, Andrea Raimondi, Carlo Tacchetti, Shafi Kuchay, Harvey I Pass, El Bachir Affar, Haining Yang, Paolo Pinton, Michele Carbone
BRCA1-associated protein 1 (BAP1) is a potent tumour suppressor gene that modulates environmental carcinogenesis. All carriers of inherited heterozygous germline BAP1-inactivating mutations (BAP1(+/-)) developed one and often several BAP1(-/-) malignancies in their lifetime, mostly malignant mesothelioma, uveal melanoma, and so on. Moreover, BAP1-acquired biallelic mutations are frequent in human cancers. BAP1 tumour suppressor activity has been attributed to its nuclear localization, where it helps to maintain genome integrity...
June 22, 2017: Nature
https://www.readbyqxmd.com/read/28613380/influence-of-processing-and-storage-of-integral-grape-juice-vitis-labrusca-l-on-its-physical-and-chemical-characteristics-cytotoxicity-and-mutagenicity-in-vitro
#18
E Düsman, I V Almeida, E P Pinto, L Lucchetta, V E P Vicentini
Integral grape juice is extracted from the grape through processes that allow the retention of their natural composition. However, due to the severity of some processes, fruit juices can undergo changes in their quality. The present study evaluated the cytotoxic and mutagenic effects of integral grape juice by a cytokinesis-blocked micronucleus assay in Rattus norvegicus hepatoma cells (HTC) in vitro. Vitis labrusca L. (variety Concord) were produced organically and by a conventional system, and their juice was extracted by a hot extraction process...
May 31, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28613371/effect-of-shenqin-biochemical-extract-on-hypoxia-inducible-factor-1%C3%AE-expression-in-ultraviolet-b-irradiated-hacat-cells
#19
X Chen, J Bai, Y Li, X-G Li, G-F Lv, H-Ch Zhang
Hypoxia-inducible factor-1α (HIF-1α) is considered the main transcriptional regulator of the hypoxia-specific cellular and developmental response. This study was performed to investigate the effect of Shenqin biochemical extract (SQBE) on HIF-1α expression in ultraviolet B (UVB)-irradiated HaCaT cells and the possible action mechanisms of SQBE against UVB-induced skin cancer. HaCaT cells in logarithmic growth phase were seeded in Dulbecco's modified Eagle's medium with 10% fetal bovine serum, and conventionally cultured at 37°C with 5% CO2...
May 31, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28613256/strawberry-based-cosmetic-formulations-protect-human-dermal-fibroblasts-against-uva-induced-damage
#20
Massimiliano Gasparrini, Tamara Y Forbes-Hernandez, Sadia Afrin, Patricia Reboredo-Rodriguez, Danila Cianciosi, Bruno Mezzetti, Josè L Quiles, Stefano Bompadre, Maurizio Battino, Francesca Giampieri
Extreme exposure of skin to Ultraviolet A (UVA)-radiation may induce a dysregulated production of reactive oxygen species (ROS) which can interact with cellular biomolecules leading to oxidative stress, inflammation, DNA damage, and alteration of cellular molecular pathways, responsible for skin photoaging, hyperplasia, erythema, and cancer. For these reasons, the use of dietary natural bioactive compounds with remarkable antioxidant activity could be a strategic tool to counteract these UVA-radiation-caused deleterious effects...
June 14, 2017: Nutrients
keyword
keyword
113806
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"