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1. Focused characteristics and effects of light reflected from spherical lipid membrane of giant unilamellar vesicles

Author:
Qiao, Hai; Wei, Zixin; Wang, Yiting; Hu, Na; Sun, Sineng; Bai, Jin; Fang, Liaoqiong; Wang, Zhibiao
Source:
Colloids and surfaces 2020 v.189 pp. 110828
ISSN:
0927-7765
Subject:
ultraviolet radiation,   etc   ; encapsulation; fluorescence; irradiation; lipids; plasmids;     Show all 6 Subjects
Abstract:
... Lipid vesicle is spherical membranous structure with a concave surface on the inside. When a beam of light illuminates a lipid vesicle, the light reflected from the vesicular concave membrane can be focused to have higher intensity and generate enhanced effects. By observing and simulating light reflected from giant unilamellar vesicles (GUVs), the intensity distribution of the light reflected fro ...
DOI:
10.1016/j.colsurfb.2020.110828

2. Preferential production of microalgal hydrocarbon pentathiolates by the photoinitiated thiol-ene reaction of botryococcene

Author:
Kawashima, Hidehisa; Saito, Moe; Watanabe, Makoto M.; Kijima, Masashi
Source:
Algal research 2020 v.46 pp. 101724
ISSN:
2211-9264
Subject:
ultraviolet radiation,   etc   ; biomass; microalgae; moieties; oils; thiols;     Show all 6 Subjects
Abstract:
... To expand the applications of algal biomass materials, the reactivity of a microalgal hydrocarbon oil, botryococcene (E)-2,3,7,10,13,16,20,21-octamethyl-6,17-dimethylene-10-vinyldocosa-1,11,21-triene), was explored. Botryococcene was reacted with an excess of several alkylthiols in the presence of a photoradical initiator under UV irradiation (λ = 365 nm). In all cases, the thiol-ene reaction proc ...
DOI:
10.1016/j.algal.2019.101724

3. Intrinsic negative TCR of superblack carbon aerogel films and their ultrabroad band response from UV to microwave

Author:
Ji, Xiujie; Wang, Hongqiang; Chen, Tianze; Zhang, Ting; Chu, Junjun; Du, Ai
Source:
Carbon 2020 v.161 pp. 590-598
ISSN:
0008-6223
Subject:
ultraviolet radiation,   etc   ; absorption; aerogels; carbon quantum dots; electrons; graphene; temperature;     Show all 7 Subjects
Abstract:
... Hot-electron effect in the superblack carbon aerogel (CA) may lead to the relatively strong response to long-wavelength electromagnetic wave by comparison with the ohmic loss effect. In this article, we find a negative temperature coefficient of resistance (TCR) with a value of about 0.13–0.15%/K in superblack CA films. Interestingly, the negative TCR is the intrinsic nature of the amorphous CA fi ...
DOI:
10.1016/j.carbon.2020.01.101

4. Effect of UV dose on degradation of venlafaxine using UV/H₂O₂: perspective of augmenting UV units in wastewater treatment

Author:
Hollman, Jordan; Dominic, John Albino; Achari, Gopal; Langford, Cooper H.; Tay, Joo-Hwa
Source:
Environmental technology 2020 v.41 no.9 pp. 1107-1116
ISSN:
1479-487X
Subject:
ultraviolet radiation,   etc   ; disinfection; hydrogen peroxide; oxidation; wastewater treatment;     Show all 5 Subjects
Abstract:
... Many water and wastewater treatment plants (WWTPs) are fitted with a UV system that provides post treatment disinfection before the water is released to receiving water. This paper presents a study on expected removal for the pharmaceutical venlafaxine (VEN) in a typical UV unit at a municipal WWTP with analysis of removal rates of an advanced oxidation process using UV irradiation with injection ...
DOI:
10.1080/09593330.2018.1521475

5. A panel of criteria for comprehensive assessment of severity of ultraviolet B radiation-induced non-melanoma skin cancers in SKH-1 mice

Author:
Bazin, Marc; Purohit, Nupur K.; Merlin, Marine A.; Shah, Girish M.
Source:
Journal of photochemistry and photobiology 2020 v.205 pp. 111847
ISSN:
1011-1344
Subject:
ultraviolet radiation,   etc   ; albino; data collection; developmental stages; mice; skin neoplasms;     Show all 6 Subjects
Abstract:
... The study of causes and cures for ultraviolet B radiation (UVB)-induced non-melanoma skin cancers (NMSC) has been greatly facilitated by use of the albino SKH-1 hairless mice. These mice develop multiple tumors of different sizes and the severity of cancer is often measured by one or more of the four criteria, namely the prevalence, multiplicity, area and volume of tumors. However, there are inher ...
DOI:
10.1016/j.jphotobiol.2020.111847

6. Lead-free perovskite [H₃NC₆H₄NH₃]CuBr₄ with both a bandgap of 1.43 eV and excellent stability

Author:
Li, Xiao-Lei; Li, Zhen; Zhang, Gao; Yang, Guan-Jun
Source:
Journal of materials chemistry A 2020 v.8 no.11 pp. 5484-5488
ISSN:
2050-7496
Subject:
ultraviolet radiation,   etc   ; gloves; nitrogen; relative humidity; semiconductors; solar cells; toxicity;     Show all 7 Subjects
Abstract:
... Searching less toxic materials with both ideal bandgaps (1.0–1.5 eV for single-junction solar cells) and excellent stability remains a big challenge in perovskite optoelectronic materials field. Here, we report the optoelectronic properties and stability of the [H₃NC₆H₄NH₃]CuBr₄ perovskite material. Intriguingly, the material features a bandgap of 1.43 eV which approaches that of GaAs (1.42 eV)—th ...
DOI:
10.1039/c9ta12872g

7. Light-Triggered Reversible Supracolloidal Self-Assembly of Precision Gold Nanoclusters

Author:
Rival, Jose V.; Nonappa,; Shibu, Edakkattuparambil Sidharth
Source:
ACS applied materials & interfaces 2020 v.12 no.12 pp. 14569-14577
ISSN:
1944-8252
Subject:
ultraviolet radiation,   etc   ; ligands; light scattering; methylene chloride; nanogold; nanoparticles; photoisomerization;     Show all 7 Subjects
Abstract:
... Monolayer thiol-protected noble metal nanoclusters are attractive nanoscale building blocks for well-defined colloidal superstructures. However, achieving facile reversible self-assembly of nanoclusters using external stimuli is still in its infancy. Herein, we report the synthesis and photon-assisted reversible self-assembly of thiolated azobenzene-stapled Au₂₅ nanoclusters. Photoactivation of fu ...
DOI:
10.1021/acsami.0c00328

8. A Fluorescent Compound from the Exuviae of the Scorpion, Liocheles australasiae

Author:
Yoshimoto, Yusuke; Tanaka, Masato; Miyashita, Masahiro; Abdel-Wahab, Mohammed; Megaly, Alhussin M. A.; Nakagawa, Yoshiaki; Miyagawa, Hisashi
Source:
Journal of natural products 2020 v.83 no.2 pp. 542-546
ISSN:
1520-6025
Subject:
ultraviolet radiation,   etc   ; Scorpiones; fluorescence; fluorescent substances; integument; molecular weight;     Show all 6 Subjects
Abstract:
... Most scorpions fluoresce under UV light. To date, two types of fluorescent compounds have been identified in scorpions, but it has been assumed that other unknown compounds may be responsible for the fluorescence. In this study, we isolated a fluorescent compound from the exuviae of the scorpion Liocheles australasiae identified as a macrocyclic diphthalate ester with a molecular mass of 496.2 Da. ...
DOI:
10.1021/acs.jnatprod.9b00972

9. Understanding the liquefaction mechanism of Beypazarı lignite in tetralin with ultraviolet irradiation using discrete time models

Author:
Şimşek, Emir Hüseyin; Güleç, Fatih; Akçadağ, Fatma Söğüt
Source:
Fuel processing technology 2020 v.198
ISSN:
0378-3820
Subject:
ultraviolet radiation,   etc   ; asphaltenes; computer software; lignite; liquefaction; models; oils; solvents;     Show all 8 Subjects
Abstract:
... This study has proposed four different liquefaction models consisting of both reversible and irreversible reaction steps with three lumped parameters, asphaltenes, preasphaltenes, and oils, for the liquefaction of Turkish lignite (Beypazarı-Çayırhan). The coal had been liquefied in tetralin using a solvent/coal ratio of 5/1 at four different ultraviolet irradiation light sources of 90, 120, 150, a ...
DOI:
10.1016/j.fuproc.2019.106227

10. CURLY LEAF Regulates MicroRNA Activity by Controlling ARGONAUTE 1 Degradation in Plants

Author:
Ré, Delfina A.; Cambiagno, Damian A.; Arce, Agustin L.; Tomassi, Ariel H.; Giustozzi, Marisol; Casati, Paula; Ariel, Federico D.; Manavella, Pablo A.
Source:
Molecular plant 2020 v.13 no.1 pp. 72-87
ISSN:
1674-2052
Subject:
ultraviolet radiation,   etc   ; alleles; leaves; methyltransferases; microRNA; mutants; tissues; ubiquitination;     Show all 8 Subjects
Abstract:
... CURLY LEAF (CLF) encodes the methyltransferase subunit of the Polycomb Repressor Complex 2 (PRC2), which regulates the expression of target genes through H3K27 trimethylation. We isolated a new CLF mutant allele (clf-78) using a genetic screen designed to identify microRNA (miRNA) deficient mutants. CLF mutant plants showed impaired miRNA activity caused by increased ubiquitination and enhanced de ...
DOI:
10.1016/j.molp.2019.10.003

11. Degradation of cyanotoxin microcystin-LR in synthetic and natural waters by chemical-free UV/VUV radiation

Author:
Chintalapati, Pranav; Mohseni, Madjid
Source:
Journal of hazardous materials 2020 v.381 pp. 120921
ISSN:
0304-3894
Subject:
ultraviolet radiation,   etc   ; alkalinity; hydroxyl radicals; microcystin-LR; oxidation; photolysis;     Show all 6 Subjects
Abstract:
... This study investigated the capability of ultraviolet radiation at 254 nm and 185 nm (UV/VUV) to degrade cyanotoxin microcystin-LR (MC-LR). Results showed 70% toxin reduction solely by 254 nm direct photolysis (ε254 = 13,225 ± 814 M−1cm−1; Φ254 = 0.29 ± 0.03 mol/Einstein). The addition of 185 nm increased MC-LR degradation through advanced oxidation by •OH (k•OH,MC-LR = 2.25 ± 0.39 × 1010 M−1s−1). ...
DOI:
10.1016/j.jhazmat.2019.120921

12. A Suzuki Approach to Quinone-Based Diarylethene Photochromes

Author:
Patel, Dinesh G.; Mitchell, Travis B.; Myers, Shea D.; Carter, Dorothy A.; Novak, Frank A.
Source:
Journal of organic chemistry 2020 v.85 no.4 pp. 2646-2653
ISSN:
1520-6904
Subject:
ultraviolet radiation,   etc   ; chemical reactions; light; moieties; organic chemistry; photons; quinones;     Show all 7 Subjects
Abstract:
... Diarylethene photochromes show promise for use in advanced organic electronic and photonic materials with burgeoning considerations for biological applications; however, these compounds typically require UV light for photoswitching in at least one direction, thus limiting their appeal. We here introduce a naphthoquinone-based diarylethene that switches between open and closed forms with visible li ...
DOI:
10.1021/acs.joc.9b02632

13. Gas chromatography vacuum ultraviolet spectroscopy: A review

Author:
Lelevic, Aleksandra; Souchon, Vincent; Moreaud, Maxime; Lorentz, Chantal; Geantet, Christophe
Source:
Journal of separation science 2020 v.43 no.1 pp. 150-173
ISSN:
1615-9306
Subject:
ultraviolet radiation,   etc   ; algorithms; detection limit; gas chromatography; ultraviolet-visible spectroscopy;     Show all 5 Subjects
Abstract:
... Accelerated technological progress and increased complexity of interrogated matrices imposes a demand for fast, powerful, and resolutive analysis techniques. Gas chromatography has been for a long time a ‘go‐to’ technique for the analysis of mixtures of volatile and semi‐volatile compounds. Coupling of the several dimensions of gas chromatography separation has allowed to access a realm of improve ...
DOI:
10.1002/jssc.201900770

14. Accelerated photoelectron transmission by carboxymethyl β-cyclodextrin for organic contaminants removal: An alternative to noble metal catalyst

Author:
Zhou, Yi; Liu, Qiming; Lu, Jian; He, Jie; Liu, Yongdi; Zhou, Yanbo
Source:
Journal of hazardous materials 2020 v.393 pp. 122414
ISSN:
0304-3894
Subject:
ultraviolet radiation,   etc   ; beta-cyclodextrin; bisphenol A; catalysts; hydrophobicity; irradiation; nanogold; nanoparticles; phenol; photocatalysis; photooxidation; titanium dioxide;     Show all 12 Subjects
Abstract:
... Applications of noble metal decorated photocatalytic nanomaterials are restricted by its high cost. In this study, carboxymethyl β-cyclodextrin (CM-β-CD), as an alternative to gold nanoparticle, was used to modified titanium dioxide (CM-β-CD-P25) to accelerate photoelectron transmission and enhance the organic contaminants removal from water. Several of emerging organic contaminants, such as bisph ...
DOI:
10.1016/j.jhazmat.2020.122414

15. Aging mechanism of microplastics with UV irradiation and its effects on the adsorption of heavy metals

Author:
Mao, Ruofan; Lang, Mengfan; Yu, Xiaoqin; Wu, Renren; Yang, Xiaomei; Guo, Xuetao
Source:
Journal of hazardous materials 2020 v.393 pp. 122515
ISSN:
0304-3894
Subject:
ultraviolet radiation,   etc   ; adsorption; heavy metals; microplastics; models; moieties; pollutants; polystyrenes; risk; seawater; wastes;     Show all 11 Subjects
Abstract:
... Microplastics are formed by the degradation of plastic wastes under the action of physicochemical mechanisms in environment, and they are becoming a new type of pollutant that is attractings global attention. However, research on the aging characteristics and mechanism of microplastics is limited. The aging mechanism of Polystyrene (PS) with UV irradiation under different conditions (air, pure wat ...
DOI:
10.1016/j.jhazmat.2020.122515

16. Anatase TiO2@MIL-101(Cr) nanocomposite for photocatalytic degradation of bisphenol A

Author:
Tang, Yuan; Yin, Xiaohong; Mu, Manman; Jiang, Yue; Li, Xiaoli; Zhang, Hao; Ouyang, Tianwei
Source:
Colloids and surfaces 2020 v.596 pp. 124745
ISSN:
0927-7757
Subject:
ultraviolet radiation,   etc   ; bisphenol A; nanocomposites; particle size; photocatalysis; superoxide anion; surface area; titanium dioxide;     Show all 8 Subjects
Abstract:
... A series of anatase TiO₂@MIL-101(Cr) was synthesized using the solvothermal method for photocatalytic degradation of bisphenol A (BPA). The characterization of the composites showed that they had an octahedral shape that was similar to that of MIL-101(Cr), but the particle size was reduced to about 300–500 nm. The amount and surface area of the TiO₂ in the composites jointly influenced the photoca ...
DOI:
10.1016/j.colsurfa.2020.124745

17. The effect of considering polar vortex dynamics in the validation of satellite total ozone observations

Author:
Paschou, Peristera; Koukouli, Maria-Elissavet; Balis, Dimitrios; Lerot, Christophe; Van Roozendael, Michel
Source:
Atmospheric research 2020 v.238 pp. 104870
ISSN:
0169-8095
Subject:
ultraviolet radiation,   etc   ; algorithms; climate change; data collection; latitude; ozone; satellites; spectrophotometers; surface area; weather forecasting;     Show all 10 Subjects
Abstract:
... The main aim of this paper is to demonstrate the magnitude in which validation results of space-based total ozone column, TOC, measurements are affected by the location of the polar vortex. Potential Vorticity is used as an indicator to determine the polar vortex's boundary and surface area, provided by ERA-Interim reanalysis datasets from the European Centre for Medium-Range Weather Forecasts (EC ...
DOI:
10.1016/j.atmosres.2020.104870

18. Photo-oxidation of particle phase iron species dominates the generation of reactive oxygen species in secondary aerosol

Author:
Jiang, Sabrina Yanan; Gali, Nirmal Kumar; Ruan, Huada Daniel; Ning, Zhi
Source:
The Science of the total environment 2020 v.723 pp. 137994
ISSN:
0048-9697
Subject:
ultraviolet radiation,   etc   ; aerosols; ions; iron; laboratory experimentation; particulates; photooxidation; reactive oxygen species;     Show all 8 Subjects
Abstract:
... This study presents an experimental investigation on the photochemical transformation of iron species in aerosol including dissolution of insoluble iron species into soluble fraction, and soluble ferric oxidation to ferrous form. This process has significantly contributed to the aerosol oxidative potential in generation of reactive oxygen species (ROS). We conducted both laboratory experiment of U ...
DOI:
10.1016/j.scitotenv.2020.137994

19. A multiphysics evaluation of the rejuvenator effects on aged asphalt using molecular dynamics simulations

Author:
Cui, Bingyan; Gu, Xingyu; Hu, Dongliang; Dong, Qiao
Source:
Journal of cleaner production 2020 v.259 pp. 120629
ISSN:
0959-6526
Subject:
ultraviolet radiation,   etc   ; adhesion; aluminum oxide; asphaltenes; bitumen; cracking; diffusivity; microstructure; molecular dynamics; silica; simulation models; temperature;     Show all 12 Subjects
Abstract:
... The rejuvenator effects on aged asphalt are easily influenced by multiple physical conditions such as ultraviolet irradiation, overheating and water exposure. In this study, a multiphysics evaluation of the rejuvenator effects on aged asphalt was conducted using molecular dynamics (MD) simulations. Different rejuvenator dosages were added to the aged asphalt model to observe the changes in the mic ...
DOI:
10.1016/j.jclepro.2020.120629

20. Using convolutional neural networks to classify the maturity of compost based on sewage sludge and rapeseed straw

Author:
Kujawa, Sebastian; Mazurkiewicz, Jakub; Czekała, Wojciech
Source:
Journal of cleaner production 2020 v.258 pp. 120814
ISSN:
0959-6526
Subject:
ultraviolet radiation,   etc   ; compost maturity; composting; cost effectiveness; early development; neural networks; rapeseed; sewage sludge; straw;     Show all 9 Subjects
Abstract:
... Large amounts of municipal sewage sludge are generated every year. Composting is one of the most popular and cost-effective methods of handling this waste. It is particularly important to carry out the composting of sewage sludge in an efficient way. The identification of the stage of early maturity of composted material is crucial. The objective of this study was to check the possibility of using ...
DOI:
10.1016/j.jclepro.2020.120814