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Ultraviolet light

About: Ultraviolet light is a research topic. Over the lifetime, 49494 publications have been published within this topic receiving 843151 citations.


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30 Sep 1996
TL;DR: The aquatic environment The intensive culture environment fish-pathogens-environment relationship Infection into disease:mechanisms Stress-mediated diseases Diseases as indicators of environmental quality Managing biological interactions to prevent diseases.
Abstract: Preface. Acknowledgements. List of Scientific Names. Chapter 1: Introduction: Historical perspective The aquatic environment The intensive culture environment. Chapter 2: Basic physiological functions: Introduction Respiration and oxygen consumption Blood and circulation Osmoregulation Parr-smolt transformation Feeding, digestion, excretion Immune protection Stress response. Chapter 3: Effects of water quality conditions: Introduction Water quality requirements: acidity alkalinity ammonia carbon dioxide chlorine dissolved oxygen hardness heavy metals hydrogen sulfide nitrate, nitrite supersaturation temperature Total dissolved solids, salinity Total suspended solids, turbidity summary Disease problems associated with water quality conditions: Gas bubble disease (Gas bubble trauma) Methemoglobinemia (Brown blood disease) Visceral granuloma and nephrocalcinosis Blue sac disease (Hydrocele embronalis) White spot (Coagualted yolk) disease Soft shell disease (Soft egg disease) Algal toxins. Chapter 4: Effects of fish cultural procedures: Introduction Crowding Transportation Formulated diets/adventitious toxins Effects of smolt development Chapter 5: Biological interactions during rearing: Introduction Interactions between fish Interactions between fish and microorganisms: fish-pathogens-environment relationship Infection into disease:mechanisms Stress-mediated diseases Diseases as indicators of environmental quality Managing biological interactions to prevent diseases. Chapter 6: Methods to minimize pathogen exsposure: Introduction Biological methods water treatment systems: Chloration Ultraviolet light ozone. Introduction: Basic physiological functions Effects of water quality conditions Effects of fish cultural procedures Biological interactions during rearing Methods to minimize pathogen exposure.

499 citations

Journal ArticleDOI
TL;DR: In contrast-enhanced MR images of 2-day-old reperfused canine infarcts, myocardial regions of hypoenhancement are related to the no-reflow phenomenon and approximately 90% of the myocardium within hyperenhanced regions is nonviable.
Abstract: Background Contrast-enhanced fast magnetic resonance (MR) images of acute, reperfused human infarcts demonstrate regions of hypoenhancement and hyperenhancement. The relations between the spatial extent and time course of these enhancement patterns to myocardial risk, infarct, and no-reflow regions have not been well characterized. Methods and Results The proximal left anterior descending coronary artery was occluded in 11 closed-chest dogs for 90 minutes followed by 2 days of reperfusion. Regional blood flow was determined by use of radioactive microspheres. The animals were studied at the 2-day time point with contrast-enhanced fast MRI (Signa 1.5 T, General Electric). Thioflavin-S was administered to demarcate no-reflow regions. The hearts were then excised, sectioned into five base-to-apex slices, stained with 2,3,5-triphenyltetrazolium chloride (TTC), and photographed under room light (for TTC) and ultraviolet light (for thioflavin). The spatial extents of thioflavin-negative, TTC-negative, and risk regions were compared planimetrically with MRI hypoenhanced and hyperenhanced regions. The spatial locations of subendocardial hypoenhancement in MR images correlated closely with those of thioflavin-negative regions. Microsphere blood flow in these regions was significantly reduced compared with remote regions (0.37±0.09 versus 0.88±0.10 mL/min per gram, respectively, P <.001) and with baseline (0.37±0.09 versus 0.87±0.15 mL/min per gram, P <.01). The spatial extent of hyperenhancement was smaller than the risk region ( r =.64, slope=0.48, P <.001) but highly correlated with TTC-negative regions and were, on average, 12% larger ( r =.93, slope=1.12, P =.035). Conclusions In contrast-enhanced MR images of 2-day-old reperfused canine infarcts, myocardial regions of hypoenhancement are related to the no-reflow phenomenon. Approximately 90% of the myocardium within hyperenhanced regions is nonviable.

499 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an overview of recent studies carried out both independently and jointly in the authors' laboratories focusing upon the remarkably rich, but relatively unexplored, photochemical and photophysical properties of various tetra-and hexanuclear d[sup 10] and s[sup 2] metal ion clusters in solution.
Abstract: Relatively little attention has been paid to metal ions with the nd[sup 10] and nd[sup 10](n+1)s[sup 2] (i.e., [open quotes]s[sup 2][close quotes]) configurations. In combination with various anionic and neutral ligands, these metal ions form a wide variety of cluster compounds, some of which have been known to be luminescent when irradiated with ultraviolet light. Prominent examples of this family are cuprous iodide clusters such as Cu[sub 4]I[sub 4]-(py)[sub 4] (1, py = pyridine), which shows [open quotes]luminescence thermochromism[close quotes]; that is, they display bright emissions with colors markedly dependent on the temperature. Here the authors present an overview of recent studies carried out both independently and jointly in the authors' laboratories focusing upon the remarkably rich, but relatively unexplored, photochemical and photophysical properties of various tetra-and hexanuclear d[sup 10] and s[sup 2] metal ion clusters in solution. 74 refs., 4 figs., 2 tabs.

493 citations

Journal ArticleDOI
TL;DR: These bFGF-modified hydrogels with RGD adhesion sites were evaluated for their effect on vascular smooth muscle cell (SMC) behavior, increasing SMC proliferation by approximately 41% and migration by approximately 15%.

492 citations

Journal ArticleDOI
TL;DR: The dramatic visible light photocatalytic activity was obtained for the degradation of Methylene Blue and Rhodamine B under visible light irradiation after TiO2 photocatallysts were modified with monolayer dispersed polyaniline (PANI) via a facile chemisorption approach.
Abstract: The dramatic visible light photocatalytic activity was obtained for the degradation of Methylene Blue (MB) and Rhodamine B (RhB) under visible light irradiation (λ > 450 nm) after TiO2 photocatalysts were modified with monolayer dispersed polyaniline (PANI ) via a facile chemisorption approach. Under visible light irradiation, PANI generated π−π* transition, delivering the excited electrons into the conduction band of TiO2, and then the electrons transferred to an adsorbed electron acceptor to yield oxygenous radicals to degrade pollutants. Also, the ultraviolet photocatalytic performance was enhanced to about two times compared with that of P-25 TiO2 photocatalyst. The high photocatalytic activity came from the synergetic effect between PANI and TiO2, which promoted the migration efficiency of photogenerated carriers on the interface of PANI and TiO2. Under ultraviolet light irradiation, photoinduced holes in TiO2 valence band could transfer into HOMO orbital of PANI and then emigrate to the photocatalys...

488 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202346
2022181
20211,101
20201,978
20192,639
20182,772