Search results for "ultraviolet"
showing 10 items of 853 documents
Ultraviolet A1 radiation induces nitric oxide synthase-2 expression in human skin endothelial cells in the absence of proinflammatory cytokines.
2001
Skin exposure to ultraviolet radiation from sunlight causes erythema and edema formation as well as inflammatory responses. As some of these ultraviolet-induced effects are potentially mediated by nitric oxide synthases, we examined the role of cytokines and ultraviolet A 1 radiation (340–400 nm) on the expression of the nitric oxide synthase-2 in endothelia of normal human skin biopsies during short-term organ culture as well as expression and activity of the nitric oxide synthase-2 in in vitro cell cultures of human dermal endothelial cells. Both, cytokine challenge (interleukin-1β + tumor necrosis factor-α + interferon-γ) but also ultraviolet A 1 exposure (50 J per cm 2 ) in the absence …
Effects of UV Radiation and Diet on Polyunsaturated Fatty Acids in the Skin, Ocular Tissue and Dorsal Muscle of Atlantic Salmon (Salmo salar) Held in…
2010
Article published in Photochemistry and Photobiology, 86 (4): 909-919 JUL-AUG 2010 The effect of UV radiation (UVR) on juvenile Atlantic salmon (Salmo salar) was assessed by measuring the fatty acid (FA) profiles of muscle, dorsal and ventral skin, and ocular tissues following 4-month long exposures to four different UVR treatments in outdoor rearing tanks. Fish were fed two different diets (Anchovy- and Herring-oil based) that differed in polyunsaturated fatty acid (PUFA) concentrations. Anchovy-fed salmon had higher concentrations of ALA (alpha-linoleic acid; 18:3n-3), EPA (eicosapentaenoic acid; 20:5n-3) and DPA (docosapentaenoic acid, 22:5n-3) in their muscle tissues than fish fed the H…
Dataset: Growth, morphology and metabolic variables of charophytes (freshwater macroalgae) under different treatments of radiation, temperature and n…
2018
Esta base de datos contiene resultados de dos experimentos (RADxTEMP y RADxNIT) a escala de microcosmos referentes a variables de crecimiento, morfológicas, metabólicas y de composición estequiométrica de 2 especies de macroalgas de agua dulce, concretamente carófitos (Chara hispida y Chara vulgaris) procedentes de dos sistemas (el lago de Somolinos en Guadalajara y el Ullal de Quartons en Castellón), por tanto, 4 poblaciones (2 especies x 2 orígenes). En estos dos experimentos de diseño factorial, los individuos de las 4 poblaciones fueron sometidos a dos niveles de radiación, dos niveles de temperatura (RADxTEMP) y dos niveles de concentración de nitrato (RADxNIT). En esta matriz de datos…
Submerged macrophytes as key players in aquatic ecosystems under global change: a multiscale experimental approach
2020
El actual cambio global está causando alteraciones en los ecosistemas de todo el mundo a través de cambios interactivos en los principales factores ambientales (e.g. la temperatura, la concentración de nutrientes y la radiación ultravioleta). Los ecosistemas acuáticos continentales son altamente vulnerables ante estos cambios y, específicamente, en la región mediterránea, la situación es peor ya que la mayoría de estos sistemas son someros y están expuestos a las perturbaciones ambientales y antrópicas. Las praderas de macrófitos sumergidos y, particularmente, los carófitos, son un elemento conspicuo de estos sistemas con un papel fundamental en su funcionamiento. Estos organismos proveen d…
Melanomas un ne-melanomas vēžu epidemioloģija, Latvijas iedzīvotāju informētība un aizsardzības pasākumi pret ādas vēžiem
2020
Problēmas būtība. Ādas vēži ir vieni no izplatītākām vēžiem Pasaulē. Katru gadu atklāto ādas vēžu skaits strauji pieaug, pētījumi norāda, ka melanomai visstraujākais pieaugums ir gaišādainiem cilvēkiem. Klimatisko apstākļu dēļ, strauji pieaug ultravioletā starojuma daudzums, un pēc 20-30 gadiem UV indekss var sasniegt bīstamo līmeni, kas krietni paaugstinās ādas vēžu saslimstības risku. Pētījuma mērķi. Uzzināt vai Latvijā ādas vēžu incidence strauji pieaug, kādi ir Latvijas iedzīvotāju prevalējoši ādas tipi. Kādi ir sauļošanās ieradumi iedzīvotājiem un vai tiek pielietoti UVS aizsardzības pasākumi. Noskaidrot vai iedzīvotāji ir informēti par ādas vēžiem un to aktualitāti. Rezultāti. Latvijā…
Iedzīvotāju sauļošanās paradumi un informētība par ultravioletā starojuma starojuma ietekmi uz organismu
2015
Saslimstība ar melanomu Latvijā un pasaulē ir augsta, un tās viens no galvenajiem izraisošajiem iemesliem ir ultravioletā starojuma iedarbība. 2012. gadā Latvijā melanomas pacientu uzskaitē ar pirmo reizi dzīvē diagnosticētu melanomu tika iekļautas 213 personas, kopā melanomas uzskaitē gada beigās bija 1967 personas (Slimību profilakses un kontroles centrs, 2014). Šis darbs dod priekšstatu par ultravioletā starojuma ietekmi un tā izraisīto kaitējumu, iedzīvotāju sauļošanās paradumiem solārijā un saulē, kā arī farmaceitu viedokli par cilvēku informētību šajā jomā. Bakalaura darbs sastāv no 64 lapaspusēm, 27 attēliem, 2 tabulām un 2 pielikumiem, darba tapšanā izmantoti 60 literatūras avoti. D…
VUV-diagnostics of low temperature hydrogen plasmas
2015
A Low-Cost Smartphone Sensor-Based UV Camera for Volcanic SO2 Emission Measurements
2017
Recently, we reported on the development of low-cost ultraviolet (UV) cameras, based on the modification of sensors designed for the smartphone market. These units are built around modified Raspberry Pi cameras (PiCams; ≈USD 25), and usable system sensitivity was demonstrated in the UVA and UVB spectral regions, of relevance to a number of application areas. Here, we report on the first deployment of PiCam devices in one such field: UV remote sensing of sulphur dioxide emissions from volcanoes; such data provide important insights into magmatic processes and are applied in hazard assessments. In particular, we report on field trials on Mt. Etna, where the utility of these devices in quantif…
Ultraviolet imaging of volcanic plumes: A new paradigm in volcanology
2017
Ultraviolet imaging has been applied in volcanology over the last ten years or so. This provides considerably higher temporal and spatial resolution volcanic gas emission rate data than available previously, enabling the volcanology community to investigate a range of far faster plume degassing processes than achievable hitherto. To date, this has covered rapid oscillations in passive degassing through conduits and lava lakes, as well as puffing and explosions, facilitating exciting connections to be made for the first time between previously rather separate sub-disciplines of volcanology. Firstly, there has been corroboration between geophysical and degassing datasets at â1 Hz, expeditin…
Rapid sensing of volcanic SO₂ fluxes using a dual ultraviolet camera system: new techniques and measurements at Southern Italian volcanoes
2012
Volatiles carry crucial information on pre- to sin-eruptive processes at active volcanoes. Measurements of gas emission rates (crater plumes, fumaroles, diffuse soil degassing) therefore improve our understanding of degassing processes and subsurface magmatic and hydrothermal conditions, and contribute to eruption forecasting. Recent technological developments in spectroscopy have allowed, over the last 30 years, the remote sensing of magmatic volatile emissions from quiescent and erupting degassing volcanoes. These data-sets have contributed to discovering cyclic gas flux components due to periodic magma supply and replenishment in magma storage zones, and/or timescales of magma migration …