Film dosimetry for occupant exposure monitoring within Far ‐UVC installations
This study examines far-UVC-sensitive films for measuring the dose received by occupants within two real-world far-UVC installations. AbstractFar-UVC radiation between 200 and 230 nm is a promising technology for reducing airborne disease transmission. Previous work with far-UVC lamps has demonstrated the efficacy of far-UVC radiation to inactivate bacteria and viruses while presenting minimal human health hazards. While far-UVC intentionally exposes the occupied space, ef fectively disinfecting air between occupants, installations must still ensure that occupant eye and skin exposure is within the recommended daily lim...
Source: Photochemistry and Photobiology - May 4, 2024 Category: Science Authors: David Welch,
Raabia Hashmi,
Camryn Petersen,
Steven Erde,
David J. Brenner,
Edward Nardell Tags: RESEARCH ARTICLE Source Type: research
Astaxanthin attenuates UV ‐irradiation aging process via activating JNK‐1/DAF‐16 in Caenorhabditis elegans
Supplementation astaxanthin (AST) can effectively reduces the accumulation of ROS, increases the mitochondrial membrane potential (MMP), and maintains the mitochondrial integrity of theCaenorhabditis elegans exposed to UV radiation. The mechanism study reveals that AST activates the JNK-1 and induces the nuclear translocation of DAF-16, thus resisting the UV-irradiation aging process and prolonging the lifespan of the nematodes. AbstractAstaxanthin (AST) is a xanthophyll carotenoid with strong oxidation resistance, which can effectively scavenge various free radicals and protect organisms from oxidative damage. AST is also...
Source: Photochemistry and Photobiology - May 3, 2024 Category: Science Authors: Xiuping Lin,
Chang ‐sheng Shao,
Shereen M. Elsherbiny,
Qing Huang Tags: RESEARCH ARTICLE Source Type: research
Viscosity effects on the dynamics of diols and diol ‐based deep eutectic solvents
In this study, we employ two-dimensional infrared spectroscopy to investigate the viscosity dependence of the structural evolution dynamics in three diols with varying chain lengths. Complementing our experimental approach, molecular dynamics simulations are conducted to extract hydrogen bond lifetimes. Our findings reveal a linear correlation between bulk viscosity, solvent fluctuation timescales, and hydrogen bond lifetimes. Notably, the selected diols exhibit the capability to form deep eutectic solvents upon mixing with choline chloride at specific molar ratios. In contrast to molecular solvents like diols, deep eutect...
Source: Photochemistry and Photobiology - May 2, 2024 Category: Science Authors: Srijan Chatterjee,
Samadhan H. Deshmukh,
Tubai Chowdhury,
Sayan Bagchi Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
Insights into biomimetic system –ligand interaction of substituted isophthalic acid: A functionality induced photophysical study
Biorthogonal amine and azide substitutions in the non-fluorescent isophthalic acid renders significant modulation of its photometric behavior. This leads to a strong binding interaction with biomimicking environments in-vitro, the amine derivative being more rigidly bound than its azide counterpart. AbstractThe present article attempts to interpret the modulation of photophysical properties of isophthalic acid (IPA) through its amino [5-amino isophthalic acid (5-amino IPA)] and azido [5-azido isophthalic acid (5-azido IPA)] substituted derivatives which are chemically potent organic ligands. The ground state structure –r...
Source: Photochemistry and Photobiology - May 1, 2024 Category: Science Authors: Neha Jalan,
Tiasha Das,
Sumit Sarkar,
Partha Pratim Ghosh,
Sumi Ganguly,
Aparna Dutta,
Madhumita Mukhopadhyay,
Soumyabrata Goswami,
Debosreeta Bose Tags: RESEARCH ARTICLE Source Type: research
Tuning properties of functionalized azobenzene photoswitches through variation of substitution and their position
The reversible photoisomerization of thirty azobenzene derivatives, theircis totrans thermal isomerization and supramolecular interactions have been controlled by various substitutions at different positions. AbstractThis perspective article features the recent work published in this journal on functionalized azobenzene photoswitches, studied by Venkataramani and coworkers [Grewal, S. et al (2024)Photochem. Photobiol., 1 –16]. Azobenzene-based photochromic molecules undergo reversibletrans-to-cis isomerization under exposure to light. The reversecis-to-trans isomerization also takes place under thermal conditions in th...
Source: Photochemistry and Photobiology - April 26, 2024 Category: Science Authors: Subhajit Bandyopadhyay Tags: HIGHLIGHT Source Type: research
Mechanistic studies on protective effects of total flavonoids from Ilex latifolia Thunb. on UVB ‐radiated human keratinocyte cell line (HaCaT cells) based on network pharmacology and molecular docking technique
Network pharmacology and molecular docking were used to predict the active components fromIlex latifolia Thunb. and their possible pathways against UVB radiation. Flavonoids fromIlex latifolia Thunb. were focused as the active components against UVB radiation. PI3K-AKT, JAK-STAT3, NF- κB, and MAPK anti-inflammatory signal pathways were focused as the possible ways for the flavonoids against UVB radiation. Cytological experiment verified the above predictions. AbstractThe aim of the present research is to investigate anti-UVB radiation activity of total flavonoids fromIlex latifolia Thunb. (namely large-leaved Kuding tea) ...
Source: Photochemistry and Photobiology - April 22, 2024 Category: Science Authors: Yunge Ma,
Yingyan Li,
Yike Yao,
Tao Huang,
Chong Lan,
Liyan Li Tags: RESEARCH ARTICLE Source Type: research
Effect of hydrogen ‐rich saline on melanopsin after acute blue light‐induced retinal damage in rats
This study observed the protective effects of hydrogen-rich saline (HRS) treatment on a rat model of blue light-induced retinal injury. Rats were exposed to blue light for 48 h to damage the retina and treated with HRS for various duration. Western blot, PCR, and immunofluorescence analyzed changes in melanopsin gene and protein expression as well as ipRGC morphology and function assessed by pERG. Acute blue light exposure reduced melanopsin gene and protein levels an d ipRGC function, while HRS accelerated their self-recovery over two weeks, increasing melanopsin expression and improving ipRGC function. AbstractExcessi...
Source: Photochemistry and Photobiology - April 19, 2024 Category: Science Authors: Xiao Wang,
Yifan Sun,
Changlin Luan,
Shiqiao Yang,
Kailei Wang,
Xiaoran Zhang,
Rui Hao,
Wei Zhang Tags: RESEARCH ARTICLE Source Type: research
The effects of photobiomodulation on the improvement of sperm parameters: A review study
In this study, a comprehensive analysis of the existing literature, specifically examining the mechanisms of action of PBM has been presented. Our objective was to enhance knowledge in the field of laser light therapy in order to promote the usage of irradiation in clinical settings in a more effective way. Within the realm of reproductive science, the utilization of PBM has been employed to enhance the metabolic processes, motility, and viability of spermatozoa. This is attributed to its advantageous effects on mitochondria, resulting in the activation of the mitochondrial respiratory chain and subsequent synthesis of ATP...
Source: Photochemistry and Photobiology - April 17, 2024 Category: Science Authors: Ali Parvin,
Gisou Erabi,
Mohammad Reza Saboohi Tasooji,
Sonia Sadeghpour,
Hassan Mellatyar,
Sahar Rezaei Arablouydareh,
Leila Navapour,
Mortaza Taheri‐Anganeh,
Hojat Ghasemnejad‐Berenji Tags: INVITED REVIEW Source Type: research
The fusion of light and immunity: Advancements in photoimmunotherapy for melanoma
In this review, we discuss recent advances in photoimmunotherapy (PIT) based strategies for the management of melanoma. PIT has the potential to ignite systemic anti-tumor immunity, which may lead to enhanced immune checkpoint-blockade or adoptive cell therapy responses. PIT is highly customizable and can be tailored in a patient-specific manner. AbstractMetastatic melanoma is an aggressive skin cancer with high mortality and recurrence rates. Despite the clinical success of recent immunotherapy approaches, prevailing resistance rates necessitate the continued development of novel therapeutic options. Photoimmunotherapy (P...
Source: Photochemistry and Photobiology - April 16, 2024 Category: Science Authors: Pranav Volety,
Carl A. Shirley,
Gagan Chhabra,
Nihal Ahmad Tags: SPECIAL ISSUE INVITED REVIEW Source Type: research
Novel D ‐π‐A hemicyanine dye as photoinitiators for in situ hydrogel formation and DLP printing
We designed and synthesized four hemicyanine dyes with a D- π-A structure. Notably, CZIN and TPAIN, due to their robust dye absorption and efficient electron transfer to ION, functioned as high-performance photosensitizers. Meanwhile, BDTIN, with its strong and broad absorption range (400–600 nm), enhanced the accuracy of visible light photopolymerizati on. AbstractThe field of biofabrication imposes stringent requirements on the polymerization activity and biosafety of photopolymeric hydrogel systems. In this investigation, we designed and synthesized four hemicyanine dyes with a D- π-A structure specifically tailor...
Source: Photochemistry and Photobiology - April 16, 2024 Category: Science Authors: Yao Du,
Yating Zhang,
Shitao Liu,
Xiwang Zhang,
Tao Wang Tags: RESEARCH ARTICLE Source Type: research
Enhanced visible light photo ‐Fenton catalysis by Fe‐doping oligo‐layer natural molybdenite with efficient carrier spatial‐driven Fe3+/Fe2+ cycle
This study serves as a crucial reference for the advancement of photo-Fenton catalysts based on molybdenite in the treatment of organic wastewater. AbstractDeveloping cost-effective and efficient photo-Fenton catalysts is crucial for advancing photo-Fenton technology. MoS2 is a representative transition metal disulfide with attractive photoresponsiveness, making it ideal for preparing composite photo-Fenton catalysts. In this study, natural molybdenite was innovatively utilized as a source of MoS2 (OM) to synthesize a low-cost and efficient Fe@MoS2 (OMF) composite photo-Fenton catalyst by comminution and adsorption, which ...
Source: Photochemistry and Photobiology - April 16, 2024 Category: Science Authors: Rong Zhang,
Zhuannian Liu,
Taoli Chen Tags: RESEARCH ARTICLE Source Type: research
Eosin Y ‐catalyzed reductive homocoupling of para‐quinone methides under visible‐light
A mild and efficient visible-lighted-promoted protocol for the synthesis of tetra-arylethane derivatives has been developed via reductive homocoupling ofp-quinone methides using eosin Y as a photocatalyst. This protocol was found operationally simple and a range of desired products was obtained in satisfactory yields. AbstractIn this manuscript, we demonstrate a visible-light driven dimerization ofpara-quinone methides using eosin Y catalyst via a reductive homocoupling process. This mild and operationally simple methodology was found to be compatible with a variety of differently substitutedpara-quinone methides and a bro...
Source: Photochemistry and Photobiology - April 11, 2024 Category: Science Authors: Rekha,
Shaheen Fatma,
Sonam Sharma,
Ramasamy Vijaya Anand Tags: SPECIAL ISSUE RESEARCH ARTICLE Source Type: research
Efficient chemiluminescence of luminol in the presence of hemin without added hydrogen peroxide †
Typical reducing agents in an alkaline medium initiate chemiluminescence of luminol in the presence of hemin, exhibiting different kinetic behavior, and the efficiency of their action is comparable to that of hydrogen peroxide and exceeds it in the case of the superoxide anion. The pertinent implications of these findings refer to new possibilities for developing chemiluminescence assays and biosensors and to precautions for determining hydrogen peroxide using luminol and hemin in samples of unknown composition, most prominently, of biological origin. AbstractThe results reported herein demonstrate for the first time that ...
Source: Photochemistry and Photobiology - April 10, 2024 Category: Science Authors: Yurii B. Tsaplev,
Aleksei V. Trofimov Tags: RESEARCH ARTICLE Source Type: research
Multi ‐targets of antimicrobial photodynamic therapy mediated by erythrosine against Staphylococcus aureus identified by proteomic approach
This study aimed to employ a proteomic approach to analyze modes of action of Ery-aPDT againstS. aureus. We determined the antibacterial effect by Ery-aPDT assays, quantified reactive oxygen species (ROS) and injury to the cell membrane, and determined protein expression using a proteomic approach combined with bioinformatic tools. Ery-aPDT was effective in reducingS. aureus to undetectable levels. In addition, the increment of ROS accompanied the increase in the reduction of cell viability, and damage to cellular membranes was shown by sublethal injury. In proteomic analysis, we found 17 differentially expressed pro...
Source: Photochemistry and Photobiology - April 10, 2024 Category: Science Authors: Jo ão Vitor de Oliveira Silva,
Jean Eduardo Meneguello,
Maíra Dante Formagio,
Camila Fabiano de Freitas,
Luis Carlos Malacarne,
Rogério Marchiosi,
Patrícia de Souza Bonfim de Mendonça,
Paula Aline Zanetti Campanerut‐Sá,
Jane Martha Grato Tags: RESEARCH ARTICLE Source Type: research
Self ‐aggregation of zinc bacteriochlorophyll‐d analogs with an acylhydrazone moiety as the 13‐keto‐carbonyl alternative
Zinc bacteriochlorophyll-d analogs possessing an acylhydrazone moiety as the 13-keto-carbonyl alternative were prepared. Similar to self-aggregation in chlorosomes, synthetic models with R=(CH2)1~6H self-aggregated in an aqueous Triton X-100 solution to give red-shifted and broadened visible absorption bands with intense CD bands. An increase in the oligomethylene chain length moved the red-shifted Qy maxima to shorter wavelengths, and branched alkyl and benzyl substitutes have left monomeric species in the hydrophobic environment inside the micelle. The R-dependent self-aggregation was ascribable to the specific Zn…O32...
Source: Photochemistry and Photobiology - April 7, 2024 Category: Science Authors: Satoru Fujii,
Hitoshi Tamiaki Tags: RESEARCH ARTICLE Source Type: research
