keyword
https://read.qxmd.com/read/38432774/genotoxicity-of-ultraviolet-light-and-sunlight-in-the-bacterium-caulobacter-crescentus-wavelength-dependence
#21
JOURNAL ARTICLE
Fabiana Fuentes-León, Nathalia Quintero-Ruiz, Frank S Fernández-Silva, Veridiana Munford, Marioly Vernhes Tamayo, Carlos Frederico Martins Menck, Rodrigo S Galhardo, Angel Sánchez-Lamar
The ultraviolet (UV) component of sunlight can damage DNA. Although most solar UV is absorbed by the ozone layer, wavelengths > 300 nm (UVA and UVB bands) can reach the Earth's surface. It is essential to understand the genotoxic effects of UV light, particularly in natural environments. Caulobacter crescentus, a bacterium widely employed as a model for cell cycle studies, was selected for this study. Strains proficient and deficient in DNA repair (uvrA-) were used to concurrently investigate three genotoxic endpoints: cytotoxicity, SOS induction, and gene mutation, using colony-formation, the SOS chromotest, and RifR mutagenesis, respectively...
2024: Mutation Research. Genetic Toxicology and Environmental Mutagenesis
https://read.qxmd.com/read/38428167/ultraviolet-irradiation-as-alternative-non-thermal-cold-pasteurization-to-improve-quality-and-microbiological-parameters-of-mango-juice-during-cold-storage
#22
JOURNAL ARTICLE
Htay Htay Wai, Khursheed Ahmad Shiekh, Saeid Jafari, Isaya Kijpatanasilp, Kitipong Assatarakul
The objectives of this research were to study the effect of UV irradiation on quality characteristics of mango juice during cold storage. Mango juice exposed to UV radiation was also used to determine zero-order and first-order kinetic models of microbial (total plate count, yeast and mold count, and Escherichia coli) reduction. According to the microbiological results, UV light at 120 J/cm2 caused a 5.19 log reduction. It was found that microbial inactivation of all tested microorganisms followed first-order kinetic model...
February 16, 2024: International Journal of Food Microbiology
https://read.qxmd.com/read/38414033/an-in-vitro-investigation-into-the-impact-of-corneal-rinsing-on-riboflavin-uva-corneal-cross-linking
#23
JOURNAL ARTICLE
Siân R Morgan, David P S O'Brart, Jinhai Huang, Keith M Meek, Sally Hayes
BACKGROUND: Corneal cross-linking (CXL) using riboflavin and ultraviolet-A light (UVA) is a treatment used to prevent progression of keratoconus. This ex vivo study assesses the impact on CXL effectiveness, as measured by tissue enzymatic resistance and confocal microscopy, of including a pre-UVA corneal surface rinse with balanced salt solution (BSS) as part of the epithelium-off treatment protocol. METHODS: Sixty-eight porcine eyes, after epithelial debridement, were assigned to six groups in three experimental runs...
February 28, 2024: Eye and Vision (London, England)
https://read.qxmd.com/read/38405525/visible-light-induced-exciton-dynamics-and-trans-to-cis-isomerization-in-azobenzene-aggregates-insights-from-surface-hopping-semiempirical-configuration-interaction-molecular-dynamics-simulations
#24
JOURNAL ARTICLE
Evgenii Titov
Assemblies of photochromic molecules feature exciton states, which govern photochemical and photophysical processes in multichromophoric systems. Understanding the photoinduced dynamics of the assemblies requires nonadiabatic treatment involving multiple exciton states and numerous nuclear degrees of freedom, thus posing a challenge for simulations. In this work, we address this challenge for aggregates of azobenzene, a prototypical molecular switch, performing on-the-fly surface hopping calculations combined with semiempirical configuration interaction electronic structure and augmented with transition density matrix analysis to characterize exciton evolution...
February 20, 2024: ACS Omega
https://read.qxmd.com/read/38403841/green-synthesis-of-tellurium-doped-sno-2-nanoparticles-with-sulfurized-g-c-3-n-4-insights-into-methylene-blue-photodegradation-and-antibacterial-capability
#25
JOURNAL ARTICLE
Misbah Umar, Humayun Ajaz, Mohsin Javed, Sana Mansoor, Shahid Iqbal, Sajid Mahmood, Abdul Rauf, Komal Aroosh, Ali Bahadur, Matar Alshalwi
The construction of SnO2 nanoparticles (NPs), specifically Te-doped SnO2 NPs, using a simple and economical co-precipitation technique has been thoroughly described in this work. NH3 served as the reducing agent in this procedure, whilst polyethylene glycol served as the capping agent. The primary goals of our work were to investigate the physicochemical properties of the synthesized SnO2 NPs and assess their potential use as antibacterial agents and photocatalysts. Scanning electron microscopy-energy dispersive X-ray, ultraviolet light, Fourier transform infrared spectroscopy, X-ray diffraction (XRD), and other analytical techniques were used to thoroughly analyze the NPs...
February 2024: Luminescence: the Journal of Biological and Chemical Luminescence
https://read.qxmd.com/read/38401513/uv-stimulated-riboflavin-exerts-immunosuppressive-effects-in-balb-c-mice-and-human-pbmcs
#26
JOURNAL ARTICLE
Xinghui Chen, Shuang Ge, Pan Xiao, Yulin Liu, Yang Yu, Yi Liu, Liping Sun, Lu Yang, Deqing Wang
Riboflavin (RF) as a photosensitizer has been used in corneal surgery and the inactivation of blood products. However, the effect of RF on immune cells after ultraviolet (UV) light stimulation has not been investigated. This study pioneered a novel application method of RF. Firstly, UV-stimulated RF was co-cultured with human peripheral blood mononuclear cells in vitro, and the apoptosis rate of lymphocyte subsets, cell proliferation inhibition rate and concentrations of IL-1β, IL-6, IL-10, TNF-α were assessed...
February 23, 2024: Biomedicine & Pharmacotherapy
https://read.qxmd.com/read/38399330/investigating-the-effectiveness-of-different-porous-nanoparticles-as-drug-carriers-for-retaining-the-photostability-of-pinosylvin-derivative
#27
JOURNAL ARTICLE
Fadak Howaili, Atefeh Saadabadi, Ermei Mäkilä, Ekaterina Korotkova, Patrik C Eklund, Outi M H Salo-Ahen, Jessica M Rosenholm
Pinosylvin monomethyl ether (PsMME) is a natural compound known for its valuable bioactive properties, including antioxidant and anti-inflammatory effects. However, PsMME's susceptibility to photodegradation upon exposure to ultraviolet (UV) radiation poses a significant limitation to its applications in the pharmaceutical field. This study, for the first time, introduces a strategy to enhance the photostability of PsMME by employing various nanoformulations. We utilized mesoporous silica nanoparticles (MSNs) coated with polydopamine via a poly(ethylene imine) layer (PDA-PEI-MSNs), thermally carbonized porous silicon nanoparticles (TCPSi), and pure mesoporous polydopamine nanoparticles (MPDA)...
February 15, 2024: Pharmaceutics
https://read.qxmd.com/read/38398541/synthesis-and-properties-of-novel-alkyl-substituted-hexaazacyclophanes-and-their-diradical-dications
#28
JOURNAL ARTICLE
Shunjie Li, Jian Chen
Radicals based on arylamine cyclophanes can be used as functional materials and show application potential in fields such as synthetic chemistry, molecular electronic components, organic light-emitting diodes, and catalytic chemistry. Using a Buchwald-Hartwig palladium-catalyzed aryl halide amination method, we synthesized a series of neutral hexaazacyclophane compounds 1 - 3 with different substituents in the meta-meta-meta positions of the phenyl rings. Three characteristic high-spin hexaazacyclophane diradical dications were obtained by two-electron oxidation using AgSbF6 : 12·+ •2[SbF6 ]- , 22·+ •2[SbF6 ]- , and 32·+ •2[SbF6 ]- ...
February 8, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38392776/identification-of-the-chaa-and-fwa-spore-color-genes-of-aspergillus-nidulans
#29
JOURNAL ARTICLE
C Elizabeth Oakley, Thomas S Barton, Berl R Oakley
Wild-type Aspergillus nidulans asexual spores (conidia) are green due to a pigment that protects the spores against ultraviolet light. The pigment is produced by a biosynthetic pathway, the genes of which are dispersed in the genome. The backbone molecule of the pigment is a polyketide synthesized by a polyketide synthase encoded by the wA gene. If wA is not functional, the conidia are white. The polyketide is modified by a laccase encoded by the yA gene and inactivation of yA in an otherwise wild-type background results in yellow spores...
January 26, 2024: Journal of Fungi (Basel, Switzerland)
https://read.qxmd.com/read/38392697/enhancing-silicon-solar-cell-performance-using-a-thin-film-like-aluminum-nanoparticle-surface-layer
#30
JOURNAL ARTICLE
Mirjam D Fjell, John Benjamin Lothe, Naomi J Halas, Mali H Rosnes, Bodil Holst, Martin M Greve
Solar cells play an increasing role in global electricity production, and it is critical to maximize their conversion efficiency to ensure the highest possible production. The number of photons entering the absorbing layer of the solar cell plays an important role in achieving a high conversion efficiency. Metal nanoparticles supporting localized surface plasmon resonances (LSPRs) have for years been suggested for increasing light in-coupling for solar cell applications. However, most studies have focused on materials exhibiting strong LSPRs, which often come with the drawback of considerable light absorption within the solar spectrum, limiting their applications and widespread use...
February 6, 2024: Nanomaterials
https://read.qxmd.com/read/38387054/facile-process-of-hibiscus-mucilage-polymer-formulation-using-hibiscus-rosa-sinensis-leaves-to-treat-second-degree-burn-and-excision-wound
#31
JOURNAL ARTICLE
Ishita Saha, Sourav Ghosh, Shubham Roy, Tarakdas Basu, Parimal Karmakar
Mucilage is a sticky substance found in various plants and microorganisms and is made up of proteins and polysaccharides. Mucilage from Hibiscus rosa sinensisis is a complex polysaccharide traditionally used to treat different skin diseases. In our study, we fabricated mucilage polymer from Hibiscus rosa sinensis leaves and evaluated its potential application in second-degree burns and excision wounds. The physical properties of Hibiscus mucilage (HM) polymer were demonstrated by using ultraviolet-visible absorption spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, Dynamic light scattering, Scanning electron microscopy, Brunauer-Emmett-Tellerand, Swelling ratio...
February 22, 2024: Biomedical Materials
https://read.qxmd.com/read/38387044/ultrastable-photodetectors-based-on-blue-cspbbr-3-perovskite-nanoplatelets-via-a-surface-engineering-strategy
#32
JOURNAL ARTICLE
Hao Wang, Zhentao Du, Xue Jiang, Sheng Cao, Bingsuo Zou, Jinju Zheng, Jialong Zhao
Recently, photodetectors based on perovskite nanoplatelets (NPLs) have attracted considerable attention in the visible spectral region owing to their large absorption cross-section, high exciton binding energy, excellent charge transfer properties, and appropriate flexibility. However, their stability and performance are still challenging for perovskite NPL photodetectors. Here, a surface engineering strategy to enhance the optical stability of blue-light CsPbBr3 NPLs by acetylenedicarboxylic acid (ATDA) treatment has been developed...
February 22, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38380625/radical-species-generating-technologies-for-decontamination-of-listeria-species-in-food-a-recent-review-report
#33
REVIEW
Rathnakumar Kaavya, Bharathipriya Rajasekaran, Kartik Shah, C Nickhil, Suguna Palanisamy, Suriya Palamae, Anandu Chandra Khanashyam, R Pandiselvam, Soottawat Benjakul, Priyamavada Thorakattu, Bharathi Ramesh, Fawzan Sigma Aurum, Karthik Sajith Babu, Sarvesh Rustagi, Seema Ramniwas
Foodborne illnesses occur due to the contamination of fresh, frozen, or processed food products by some pathogens. Among several pathogens responsible for the illnesses, Listeria monocytogenes is one of the lethal bacteria that endangers public health. Several preexisting and novel technologies, especially non-thermal technologies are being studied for their antimicrobial effects, particularly toward L. monocytogenes . Some noteworthy emerging technologies include ultraviolet (UV) or light-emitting diode (LED), pulsed light, cold plasma, and ozonation...
February 21, 2024: Critical Reviews in Food Science and Nutrition
https://read.qxmd.com/read/38371995/inactivation-of-hepatitis-a-virus-feline-calicivirus-and-tulane-virus-on-formica-coupons-using-ultraviolet-light-technologies
#34
JOURNAL ARTICLE
E Corson, B Pendyala, A Patras, D H D'Souza
Contaminated fomites can lead to hepatitis A virus (HAV) and human norovirus (HuNoV) disease outbreaks. Improved decontamination methods that are user-friendly, cost-effective, and waterless are being researched for sustainability. Traditional ultraviolet light (UV-C) technologies though effective for surface decontamination have drawbacks, using mercury lamps, that pose user-safety risk and environmental hazards. Therefore, UV-C light emitting diode (LED) systems are being designed for delivering required antiviral doses...
February 15, 2024: Heliyon
https://read.qxmd.com/read/38371837/biosynthesis-of-cry5b-loaded-sulfur-nanoparticles-using-arthrobotrys-oligospora-filtrate-effects-on-nematicidal-activity-thermal-stability-and-pathogenicity-against-caenorhabditis-elegans
#35
JOURNAL ARTICLE
Pasin Jammor, Tanatcha Sanguanphun, Krai Meemon, Boonhiang Promdonkoy, Panadda Boonserm
Cry5B, a crystal protein produced by Bacillus thuringiensis (Bt), is a bionematicide with potent nematicidal activity against various plant-parasitic and free-living nematodes. This protein, however, is susceptible to destruction by ultraviolet light, proteolytic enzymes, and high temperatures. This study aims to produce Cry5B protein for bionematicidal use and improve its stability and nematicidal efficacy by loading it into Arthrobotrys oligospora -mediated sulfur nanoparticles (AO-SNPs). Based on the mortality assay, the Cry5B protein exhibited dose-dependent nematicidal activity against the model organism Caenorhabditis elegans ...
February 13, 2024: ACS Omega
https://read.qxmd.com/read/38358633/effects-of-different-aging-methods-on-the-ability-of-biochar-to-adsorb-heavy-metal-cadmium-and-its-physical-and-chemical-properties
#36
JOURNAL ARTICLE
Xiao Liang, Su Chen, Xiaoying Zhang, Ziyan Hou, Xiaonan Lin, Lei Chao
The aging process can affect the physical and chemical properties as well as adsorption capacity of biochar. This study focuses on the heavy metal cadmium (Cd) as the research object, and artificially ages biochar prepared from rice straw and corn straw through accelerated freeze-thaw cycles, alternating dry wet cycles, and ultraviolet light treatment, in order to evaluate the effects of different aging conditions on the physical and chemical properties of the two different types of biochar and on their adsorption capacities for Cd...
February 15, 2024: Environmental Science and Pollution Research International
https://read.qxmd.com/read/38356125/safety-and-effectiveness-assessment-of-ultraviolet-c-disinfection-in-aircraft-cabins
#37
JOURNAL ARTICLE
Kris Belland, Diego Garcia, Charles DeJohn, Gary R Allen, William D Mills, Stephen P Glaudel
INTRODUCTION: Aircraft cabins, susceptible to disease transmission, require effective strategies to minimize the spread of airborne diseases. This paper reviews the James Reason Swiss Cheese Theory in mitigating these risks, as implemented by the International Civil Aviation Organization during the COVID-19 pandemic. It also evaluates the use of airborne ultraviolet-C (UV-C) light as an additional protective measure. METHODS: Our approach involved a thorough literature review by experts and a detailed risk-vs...
March 1, 2024: Aerospace Medicine and Human Performance
https://read.qxmd.com/read/38355555/synthesis-and-characterization-of-cu-doped-zno-nanostructures-for-uv-sensing-application
#38
JOURNAL ARTICLE
K Al-Heuseen, A I Aljameel, R K Hussein
In this work, Fabrication, and characterization of Cu-doped ZnO thin films deposited on porous silicon (PSi) substrates have been reported using electrochemical deposition (ECD) technique. The influence of Cu-doping concentrations on morphology, structure, and electrical characteristics of zinc oxide (ZnO) thin films were presented. X-ray diffraction analysis (XRD) has been used to characterize the lattice constants, average size, in-plane (along a-axis) and out of plane (along c-axis) strains for the Cu-ZnO crystals...
February 14, 2024: BMC chemistry
https://read.qxmd.com/read/38354334/twisted-intramolecular-charge-transfer-state-addition-to-electron-poor-olefins
#39
JOURNAL ARTICLE
Mauricio Bahena Garcia, Manvendra Singh, Elizabeth Miller, Sarah Neuenswander, Justin Douglas, Zarko Boskovic
When electron-rich arylpyrrolinium salts are irradiated with ultraviolet light in the presence of Michael acceptors, the pyrrolinyl and aryl fragments add to the activated and polarized double bond in a regioselective manner, forming two C-C bonds and fragmenting the substrate. In this paper, we present a model for this intriguing reaction, supported by spectroscopy and computational analyses, and provide evidence for rectifying previously misassigned structures. We postulate that the photochemical reaction is inefficient because the reaction between the twisted intramolecular charge-transfer state and the olefin competes with fluorescence from this state upon photon absorption...
February 14, 2024: Journal of Organic Chemistry
https://read.qxmd.com/read/38347037/significance-of-melanin-distribution-in-the-epidermis-for-the-protective-effect-against-uv-light
#40
JOURNAL ARTICLE
Daniela F Zamudio Díaz, Loris Busch, Marius Kröger, Anna Lena Klein, Silke B Lohan, Karsten R Mewes, Lars Vierkotten, Christian Witzel, Sascha Rohn, Martina C Meinke
Melanin, the most abundant skin chromophore, is produced by melanocytes and is one of the key components responsible for mediating the skin's response to ultraviolet radiation (UVR). Because of its antioxidant, radical scavenging, and broadband UV absorbing properties, melanin reduces the penetration of UVR into the nuclei of keratinocytes. Despite its long-established photoprotective role, there is evidence that melanin may also induce oxidative DNA damage in keratinocytes after UV exposure and therefore be involved in the development of melanoma...
February 12, 2024: Scientific Reports
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