Temat: ultraviolet radiation - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: UV Radiation Detection Using Optical Sensor Based on Eu3+ Doped PMMA
Autorzy:: Miluski, P.
Kochanowicz, M.
Żmojda, J.
Dorosz, D.
Powiązania:: https://bibliotekanauki.pl/articles/220742.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultraviolet radiation
UV
optical fibre sensor
lanthanides
Opis:: Progress in UV treatment applications requires new compact and sensor constructions. In the paper a hybrid (organic-inorganic) rare-earth-based polymeric UV sensor construction is proposed. The efficient luminescence of poly(methyl) methacrylate (PMMA) matrix doped by europium was used for testing the optical sensor (optrode) construction. The europium complex assures effective luminescence in the visible range with well determined multi-peak spectrum emission enabling construction of the optrode. The fabricated UV optical fibre sensor was used for determination of Nd:YAG laser intensity measurements at the third harmonic (355 nm) in the radiation power range 5.0-34.0 mW. The multi-peak luminescence spectrum was used for optimization of the measurement formula. The composition of luminescent peak intensity enables to increase the slope of sensitivity up to -2.8 mW^-1. The obtained results and advantages of the optical fibre construction enable to apply it in numerous UV detection systems.
Źródło:: Metrology and Measurement Systems; 2016, 23, 4; 615-621
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: UVA radiation enhancement of beta-carotene yields in Rhodotorula mucilaginosa
Zwiększenie produkcji beta-karotenu w drożdżach Rhodotorula mucilaginosa pod wpływem promieniowania UVA
Autorzy:: Bogacz-Radomska, L.
Harasym, J.
Powiązania:: https://bibliotekanauki.pl/articles/5369.pdf
Data publikacji:: 2016
Wydawca:: Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
Tematy:: UV radiation zob.ultraviolet radiation
ultraviolet radiation
beta-carotene
carotenoid
yield
Rhodotorula mucilaginosa
yeast
visible spectrum
VIS radiation zob.visible spectrum
Opis:: The influence of UVA and VIS radiation on the β-carotene biosynthesis by yeast Rhodotorula mucilaginosa was studied. The impact of radiation characteristic on biomass growth, substrate consumption and β-carotene production in submerged batch culture in bioreactor was studied. Three different types of light sources were used in the experiment: VIS – 15 W, wavelength range from 400 to 800 nm, the largest emission at 420 nm; UVA – 18 W, blue light, wavelength range of 350 to 430 nm, the largest emission at 370 nm; UVA – 20 W, wavelength range from 350 to 575 nm, the largest emission at 350 nm. In cultures conducted with UVA – 18 W radiation the highest β-carotene and carotenoids cellular concentration were achieved, respectively 63.20 μg/gd.w. and 0.97 mg/gd.w.. In cultures subject to VIS radiation a lower β-carotene concentration at 43.60 μg/gd.w. and the total carotenoids concentration at 0.83 mg/gd.w. was obtained. The ultraviolet radiation with the emission peak of radiation at 370 nm promoted the β-carotene and carotenoids production in yeast Rhodotorula mucilaginosa.
Badano wpływ promieniowania UVA i VIS na biosyntezę β-karotenu przez drożdże Rhodotorula mucilaginosa. Określano wpływ promieniowania charakterystycznego na wzrost biomasy, zużycie substratu i produkcję β-karotenu we wgłębnej hodowli okresowej prowadzonej w bioreaktorze. Zastosowano trzy różne rodzaje źródeł światła: VIS – 15 W, zakres długości fali od 400 do 800 nm, największa emisja przy 420 nm; UVA1 – 18 W, zakres długości fali od 350 do 430 nm, największa emisja przy 370 nm; UVA2 – 20 W, zakres długości fali od 350 do 575 nm, największa emisja przy 350 nm. W kulturach prowadzonych za pomocą promieniowania UVA otrzymano najwyższe stężenie β-karotenu i karotenoidów, odpowiednio 63,20 μg/gs.m. i 0,97 mg/gs.m. W hodowlach napromieniowanych lampą VIS uzyskano niższe stężenie β-karotenu (43,60 μg/gs.m) i karotenoidów (0,83 mg/gs.m). Promieniowanie ultrafioletowe ze szczytem emisji promieniowania przy 370 nm promowało produkcję β-karotenu i karotenoidów w komórkach drożdży Rhodotorula mucilaginosa.
Źródło:: Nauki Inżynierskie i Technologie; 2016, 3(22)
2449-9773
2080-5985
Pojawia się w:: Nauki Inżynierskie i Technologie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dynamics of photosynthetic and oxidative stress parameters of two spinach species after short-term low UV-B radiation effect
Autorzy:: Januškaitienė, I.
Sakalauskienė, S.
Powiązania:: https://bibliotekanauki.pl/articles/12615273.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:: spinach
plant species
ultraviolet radiation
radiation effect
stress parameter
Opis:: This work aimed to underline the dynamics of photosynthetic and oxidative stress parameters of ‘Matador’ and ‘Andromeda’ spinach species after short-term 1 and 2 kJm–2 UV-B radiation effect. When plants reached 3–4 leaves growths stage, the exposure to 1 kJm–2 and 2 kJm–2 UV-B radiation was done once for 68 and 136 minutes, respectively. The photosynthetic and oxidative stress parameters were determined 2, 24, 48 and 72 hours after exposure. The stimulating effect of UV-B emerged on the 3rd day after exposure. The positive effect of UV-B was more pronounced for ‘Matador’. The highest DPPH radical-scavenging capacity and the highest concentration of α-tocopherols were detected 24 hours after 2 kJ UV-B exposure, but the decrease in photosynthetic rate was the highest as well. Meanwhile, on the 3rd day after 1 kJ UV-B exposure, the indicators of oxidative stress of ‘Matador’ decreased, and the photosynthetic rate increased. This study highlights that low UV-B radiation acts as an eustress, by awaking positive changes in photosynthetic and oxidative stress parameters of spinach.
Źródło:: Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 1; 141-149
1644-0692
Pojawia się w:: Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wpływ promieniowania ultrafioletowego na oczy i otaczającą je skórę
The influence of ultraviolet radiation on the eyes and periocular skin
Autorzy:: Czajkowski, Janusz
Grabowski, Robert
Powiązania:: https://bibliotekanauki.pl/articles/1035130.pdf
Data publikacji:: 2019
Wydawca:: Medical Education
Tematy:: ochrona oczu
promieniowanie ultrafioletowe
ultraviolet radiation
eye protection
Opis:: Excessive exposure to sunlight is harmful to our health. The effects of ultraviolet (UV) rays on the skin are commonly known, but our knowledge about the influence of sunlight on the eyes is neglected. Prolonged exposure to UVA accelerates skin ageing around the eyes. Children are more exposed to UV radiation than adults and the elderly because of their more translucent lens. In the lenses of the elderly cataract develops easier, and with regard to the retina UVB is one of the risk factors for developing age-related macular degeneration. The first defensive reaction is to squint and narrow the pupils. Another filter are pigments to contained in the retina spot: lutein, and zeaxanthin. In addition, the eyes should be protected with sunglasses or contact lenses with an approved UV filter. Above all; however, it is needed to remember about the moderate use of sunbathing and that tanning beds are recommended only for adults. People who spend a lot of time in the sun should consume a diet rich in antioxidants.
Nadmiar promieni słonecznych jest szkodliwy dla naszego zdrowia. Powszechnie znamy działanie promieni ultrafioletowych (UV) na skórę, ale nasza wiedza na temat wpływu promieni słonecznych na wzrok jest znikoma. Długotrwałe narażenie na fale UVA przyspiesza ponadto starzenie się skóry wokół oczu. Oczy dzieci są bardziej narażone na promieniowanie UV z powodu bardziej przeziernej soczewki niż u osób dorosłych i starszych. U osób starszych w soczewce łatwiej dochodzi do rozwoju zaćmy, a w przypadku siatkówki UVB jest jednym z czynników ryzyka rozwoju zwyrodnienia plamki związanego z wiekiem. Pierwszą reakcją obronną jest mrużenie oczu i zwężenie źrenic. Następnym filtrem są barwniki zawarte w plamce siatkówki, luteina i zeaksantyna. Dodatkowo oczy należy ochraniać okularami przeciwsłonecznymi z atestowanym filtrem UV i soczewkami kontaktowymi z podobnym filtrem. Przede wszystkim trzeba jednak pamiętać o umiarkowanym korzystaniu z kąpieli słonecznych i o tym, że uczęszczanie do solarium wskazane jest tylko w przypadku osób dorosłych. Osoby spędzające dużo czasu na słońcu powinny stosować dietę bogatą w antyoksydanty.
Źródło:: OphthaTherapy; 2019, 6, 2; 65-68
2353-7175
2543-9987
Pojawia się w:: OphthaTherapy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fluorescence optical analysis method for assessing homogeneity of granular mixtures
Autorzy:: Matuszek, Dominika B.
Królczyk, Jolanta B.
Powiązania:: https://bibliotekanauki.pl/articles/1848991.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: fluorescence
ultraviolet radiation
homogeneity
multicomponent granular mixtures
tracer
Opis:: This paper presents a method of optical fluorescence analysis for the evaluation of homogeneity of multicomponent grain mixtures. This method is based on the evaluation of the content of fluorescent marker. Maize with two degrees of fineness d1 = 1.25 mm and d2 = 2.00 mm was used as a tracer. Maize was covered with Rhodamine B, which emits red light under the influence of ultraviolet radiation. The tracer was introduced into the mixture before the mixing process began. Nine multicomponent grain mixtures were used. The proportion of fluorescent maize was evaluated on the basis of computer image analysis. Additionally, the fraction of the tracer was evaluated using a control method (validation of the accuracy of the proposed method). The results indicate that the degree of the tracer’s fineness influences the results obtained. The use of fluorescent maize with particle size d2 = 2.00 mm allowed to obtain results which differed less from the control method. The average size of the difference in results ranged from 0.20-0.38 for the 2.00 mm tracer and 0.38-1.34 for the 1.25 mm tracer.
Źródło:: Metrology and Measurement Systems; 2021, 28, 1; 41-54
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Promieniowanie nadfioletowe - zasady zapobiegania negatywnym skutkom zdrowotnym
Ultraviolet radiation - the principles of the prevention of negative health effects
Autorzy:: Łastowiecka-Moras, E.
Bugajska, J.
Powiązania:: https://bibliotekanauki.pl/articles/179121.pdf
Data publikacji:: 2008
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: promieniowanie UV
narażenie zawodowe
ultraviolet radiation
occupational exposure
Opis:: Promieniowanie nadfioletowe (UV) może mieć pozytywne i negatywne skutki dla organizmu człowieka. Korzystny wpływ nadfioletu to przede wszystkim jego działanie przeciwkrzywicze. Do szkodliwych skutków działania UV należy zaliczyć przede wszystkim, fotostarzenie się skóry oraz nowotwory skóry, a w obrębie narządu wzroku zaćmę. Promieniowania nadfioletowego nie można uniknąć, trzeba jedynie nauczyć się, jak skutecznie się przed nim zabezpieczyć. Osoby z fototypem skóry I, niemowlęta i dzieci oraz osoby z licznymi znamionami powinny w szczególności unikać promieniowania nadfioletowego. Pozostałe osoby (z fototypem II, III i IV) powinny racjonalnie korzystać z kąpieli słonecznych, stosując odpowiednie środki ochrony. Dotyczy to zwłaszcza osób wykonujących pracę zawodową na otwartej przestrzeni, narażonych na działanie UV.
Ultraviolet radiation (UV) can have positive and negative effects on the human body. Its role in Vitamin D production is a primary positive effect. Harmful effects of UV radiation are, first of all, photoaging of the skin as well as skin cancers, and in the area of vision, cataracts. Because we cannot avoid ultraviolet radiation, we should learn how we can effectively protect ourselves against it. In particular, persons with skin phototype I, infants and children, as well as persons with numerous birthmarks should avoid ultraviolet radiation. Other persons (phototype II, III and IV) can sunbathe with suitable protection. This especially concerns outdoor workers exposed to UV radiation.
Źródło:: Bezpieczeństwo Pracy : nauka i praktyka; 2008, 11; 21-23
0137-7043
Pojawia się w:: Bezpieczeństwo Pracy : nauka i praktyka
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Comparative Analysis of the Effectiveness of Reverse Osmosis and Ultraviolet Radiation of Water Treatment
Autorzy:: Dirisu, Gabriel B.
Okonkwo, Ugochukwu C.
Okokpujie, Imhade P.
Fayomi, Ojo S.I.
Powiązania:: https://bibliotekanauki.pl/articles/125109.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: water treatment
water treatment techniques
ultraviolet radiation
reverse osmosis
Opis:: Water contamination and pollution pose health hazards to humanity and hence the need for their treatment. This study compared reverse osmosis (RO) and ultra-violet (UV) radiation in treating borehole water (BHW) and surface water (SW). The study area is Omoku community in Rivers State of Nigeria. The RO- and UV-treated waters were determined by their physicochemical characteristics and total Coliform, with the control to check the impact of each one. The obtained results showed slight variations, which were either significant or not. The pH of the treated BHW was slightly acidic with the value of 6.52. Water conductivity ranged from 40.33 µs/cm³ to 42.40 µs/cm³ for the BHW treated with RO, UV and control samples, respectively. SW conductivity attained a range of 425.07–800.0 µs/cm³. Turbidity of BHW were beyond the detectable limit but was higher than the WHO limit of <5.00NTU, while total suspended solid (TSS) of SW ranged from 9.08–46.43 ppm. Total dissolved solids (TDS) values of water were between 3.50 ppm and 16.67 ppm for RO treated BHW and higher than that of SW. There was a reduction of salinity of BHW from 40.7 mg/l to 11.8 and 21.6 mg/l following RO and UV treatment, while SW salinity was also reduced from 75.0 mg/l to 20 mg/l in RO treated water and 16 mg/l in UV treated water. In this study, RO and UV water treatment proved to be effective in producing potable water from both BHW and SW, although RO seemed to produce water with reduced mineral content in comparison to the UV treatment. Both methods effectively reduced heavy metals as well as Coliform. The physicochemical parameters tested were below the WHO recommended limits in most cases. It is recommended that both methods be incorporated in a single WT in order to gain the benefits of both technologies.
Źródło:: Journal of Ecological Engineering; 2019, 20, 1; 61-75
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Effect of sunlight and ultraviolet radiation on the efficacy of Fe-doped titanium dioxide (Fe-TiO2) nanoparticles for the removal of furfural from aqueous solutions
Autorzy:: Veisi, F.
Zazouli, M. A.
Zadeh, M. A. E.
Charati, J. Y.
Dezfuli, A. S.
Powiązania:: https://bibliotekanauki.pl/articles/207273.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: chromatography
titanium dioxide
ultraviolet radiation
chromatografia
dwutlenek tytanu
promieniowanie ultrafioletowe
Opis:: Furfural, chemical compound very harmful to human health and difficult to degrade, is used or generated in many industries, including petrochemical, paper, and oil refining industries. The study evaluates the performance of Fe-TiCh nanoparticles for the removal of furfural in the presence of sunlight and UV radiation. Fe-TiO₂ nanoparticles were prepared by the sol-gel method, and the characteristics of the resultant nanoparticles were determined using scanning electron microscopy. Samples with known concentrations of furfural and nanoparticles were individually exposed to sunlight and UV radiation under varying conditions, and the residual furfural concentration was measured using high- performance liquid chromatography. The results showed that for both processes the efficiency of furfural removal increased with increased reaction time, nanoparticle loading, and pH, whereas the efficiency decreased with increased furfural concentratioa The highest removal efficiencies of the Fe-TiCh/UV and Fe-TiCh/sun processes were 95 and 76%, respectively. In general, the degradation and elimination rate of furfural using Fe-TiO₂/UV process was higher than Fe-TiCVsun process because TiO₂ nanoparticles can only be activated upon irradiation with photons of light in the UV domain.
Źródło:: Environment Protection Engineering; 2017, 43, 3; 207-224
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Effect of the Ultraviolet C Light-Emitting Diode Treatment on the Quality of Soil-Grown and Pot-Grown Red Raspberries
Autorzy:: Giuggioli, Nicole R.
Nucera, Daniele M.
Piano, Serenella
Ollani, Selene
Powiązania:: https://bibliotekanauki.pl/articles/24024622.pdf
Data publikacji:: 2023-11-14
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:: Rubus idaeus L
ultraviolet radiation
bioactive compounds
shelf-life extension
Opis:: Red raspberries (Rubus idaeus L.) are often chosen by consumers for their flavour, taste, and health-promoting properties A relevant issue related to these fruits is their high perishability. The aim of this study was to investigate the effect of the ultraviolet C light-emitting diode (UVC-LED) treatment on soil-grown and pot-grown raspberries in extending their shelf-life, maintaining their high quality throughout the preservation period, and improving features related to their phenolic compound content. The UVC-LED treatment increased the total phenolic content (158 to 200 mg GAE/100 g) and ferric reducing antioxidant power (55.3 to 78.6 mmol Fe²+/kg) of the pot-grown raspberries when the UVC-LED treatment was followed by storage in a climate-controlled room (20°C). Total anthocyanin content did not increase significantly compared to the control samples. Contrary to expectations, no effect of reducing the microbial count after storage was observed due to the exposure of raspberries to the UVC-LED radiation. The positive outcomes derived from the analyses of bioactive compounds may be implemented in further studies on the same matrix to better manage the treatment and its conditions, such as the exposure time, the distance from the LED lamps, and the UVC-rays’ dose, in order to find the best combination in terms of efficacy and efficiency.
Źródło:: Polish Journal of Food and Nutrition Sciences; 2023, 73, 4; 345-353
1230-0322
2083-6007
Pojawia się w:: Polish Journal of Food and Nutrition Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The research and analysis of the bactericidal properties of the spacer knitted fabric with the UV-C system
Autorzy:: Łada-Tondyra, Ewa
Jakubas, Adam
Jabłońska, Beata
Stańczyk-Mazanek, Ewa
Powiązania:: https://bibliotekanauki.pl/articles/2063894.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: fibre optics
sterilization
textronics
ultraviolet radiation
warp-knitted spacer fabrics
Opis:: The research and analysis of the bactericidal properties of the spacer knitted fabric with the UV-C system are presented in this paper. The disintegration factor affecting the bacteria in the knitted fabric is the UV-C radiation in the range of 265–270 nm distributed via woven optical fibres. The way of integrating elements of the system generating the UV-C radiation in the structure of the spacer knitted fabric was designed, as well as various configurations of optical fibres arrangement, fibre density, number of radiation sources, and diode types were tested. The material was contaminated with selected microorganisms indicative of sanitary contamination and important in terms of nosocomial infections. The scope of the research included microbiological (quantitative and qualitative) analyses of selected taxonomic groups of microorganisms (mesophilic bacteria, fungi, actinomycetes) before and after the irradiation process. The analysis of the research results and the applied modification of the knitted fabric turned out to be effective in reducing the amount of potentially pathogenic microorganisms.
Źródło:: Opto-Electronics Review; 2021, 29, 4; 192--200
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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