Ravindra K Shukla, Rajesh K Yadav, Vittal L Gole, Satyam Singh, Navneet Kumar Gupta, Jin-Ook Baeg
Sulfur-doped Eosin-B (SDE-B) photocatalysts were synthesized for the first time utilizing sublimed sulfur (S8 ) as a dopant in an in situ thermal copolymerization technique. Sulfur doping not only increased Eosin-B (E-B) absorption range for solar radiation but also improved fixation and oxygenation capabilities. The doped sulfur bridges the S-S bond by substituting for the edge bromine of the E-B bond. The improved photocatalytic activity of SDE-B in the fixation and oxygenation of NAD+ /NADP+ and sulfides using solar light is attributed to the photo-induced hole of SDE-B's high fixation and oxygenation capacity, as well as an efficient suppression of electron and hole recombination...
December 6, 2023: Photochemistry and Photobiology
Xin-Rui Chen, Wen-Jun Jiang, Qian-Hong Guo, Xiang-Yang Liu, Ganglong Cui, Laicai Li
We have employed the highly accurate multistate complete active space second-order perturbation theory (MS-CASPT2) method to investigate the photoinduced excited state relaxation properties of one unnatural base, namely Z. Upon excitation to the S2 state of Z, the internal conversion to the S1 state would be dominant. From the S1 state, two intersystem crossing paths leading to the T2 and T1 states and one internal conversion path to the S0 state are possible. However, considering the large barrier to access the S1 /S0 conical intersection and the strong spin-orbit coupling between S1 and T2 states (>40 cm-1 ), the intersystem crossing to the triplet manifolds is predicted to be more preferred...
December 1, 2023: Photochemistry and Photobiology
David J Brenner
There has been much recent interest in whole-room far-UVC (wavelength around 222 nm) to markedly and safely reduce overall levels of airborne pathogens in occupied indoor locations. Far-UVC light produces very low levels of ozone-in real-world scenarios induced ozone levels of less than 10 ppb, and much less in moderately or well-ventilated rooms compliant with US far-UVC dose recommendations, and very much less in rooms compliant with international far-UVC dose standards. At these very low ozone levels, there is no epidemiological evidence of increased health risks from any of the very large outdoor ozone studies, whether from ozone alone or from ozone plus associated pollutants...
November 30, 2023: Photochemistry and Photobiology
Luis A Ortiz-Rodríguez, Naishka E Caldero-Rodríguez, Sourav Kanti Seth, Karitza Díaz-González, Carlos E Crespo-Hernández
Prolonged ultraviolet exposure results in the formation of cyclobutane pyrimidine dimers (CPDs) in RNA. Consequently, prebiotic photolesion repair mechanisms should have played an important role in the maintenance of the structural integrity of primitive nucleic acids. 2,6-Diaminopurine is a prebiotic nucleobase that repairs CPDs with high efficiency when incorporated into polymers. We investigate the electronic deactivation pathways of 2,6-diaminopurine-2'-deoxyribose and 9-methyl-2,6-diaminopurine in acetonitrile and aqueous solution to shed light on the photophysical and excited state properties of the 2,6-diaminopurine chromophore...
November 28, 2023: Photochemistry and Photobiology
Anaeliza Figueiredo Dos Santos, Flávia Cristina Rosin Prado, Cristina de Paula Novaes, Ana Carolina de Magalhães, Maria Cristina Zindel Deboni, Luciana Corrêa
The aim of this study was to investigate whether simultaneous irradiation at 660 and 808 nm generates different patterns of oxidative/antioxidative activities compared to consecutive irradiation. Primary cultures of gingival keratinocytes and fibroblasts were exposed to a diose laser (660 ± 2 nm and 808 ± 2 nm, 100 mW, 0.09 cm2 spot area) using double irradiation with the two wavelengths (consecutive or simultaneous) for 6, 10, and 20 s...
November 27, 2023: Photochemistry and Photobiology
Lakshmy Kannadi Valloli, Kavyasree Manal, Brieanna Lewis, Steffen Jockusch, Jayaraman Sivaguru
The irradiation of β-enaminones, generated in situ from cyclic 1,3-diketones and activated alkenes leads to polyheterocyclic skeletons. The photoproduct chemoselectivity depends on the type of cyclic 1,3-diketones employed viz., 2-acetylcyclopentanone and 2-acetylcyclohexanone. The observed chemoselectivity was rationalized based on the Dieckmann-Kon rule.
November 27, 2023: Photochemistry and Photobiology
Peng Shu, Ling Jiang, Menggeng Li, Yi Li, Zhengqiang Yuan, Li Lin, Ju Wen, Haji Akber Aisa, Zhiyun Du
Over the past decades, increasing evidences have demonstrated that five retinoids, including retinol (ROL), retinol acetate (RAc), retinol propionate (RP), retinol palmitate (RPalm), and hydroxypinacolone retinoate (HPR), can be potential therapeutic agents for skin photoaging. However, therapeutic efficacies and biosafety have never been compared to these compounds. This study aimed to determine the optimal retinoid type(s) for anti-photoaging therapy both in vitro and in vivo. Our data demonstrated that four retinoids (RPalm, RP, HPR and ROL) but not RAc were effective for anti-photoaging treatment at 5 μg/mL in vitro, with action mechanisms associated with antioxidative, anti-inflammatory and anti-skin ECM degradation activities...
November 21, 2023: Photochemistry and Photobiology
Peng Yi, Yan Huang, Xin Zhao, Zhengshan Qin, Danli Zhu, Li Liu, Yuxi Zheng, Jianguo Feng, Menghong Long
Alternative splicing of precursor messenger RNA (pre-mRNA), including linear splicing and back splicing, produces multiple isoforms that lead to diverse cell fates in response to stimuli including ultraviolet radiation (UVR). Although UVR-induced linear gene splicing has been extensively studied in skin cells, the UVR-induced gene back-splicing events that lead to the production of circular RNAs (circRNAs) have not been thoroughly investigated. The present study used circRNA transcriptome sequencing to screen the differentially expressed circRNAs in human keratinocytes (HaCaT) after UVA irradiation...
November 20, 2023: Photochemistry and Photobiology
Saber Hosseini, Najmedin Azizi
An open new perspective has been established toward synthesizing eco-friendly CSA@g-C3 N4 employing surface engineering. The carbon nitride modified through camphorsulfonic acid was designed and developed in a category of the new generation of photocatalysts for the oxidation of benzyl alcohol and thioanisole in the existence of a natural deep eutectic solvent (NADES). In comparison with pure g-C3 N4 , not only does CSA@g-C3 N4 exhibit an extraordinarily higher ability for harvesting visible light stemming from declining the recombination rate of electrons/holes dependent on PL results but it also reveals notable photocatalytic oxidation capability in the transformation of alcohols as well as thiols into relevant compounds...
November 16, 2023: Photochemistry and Photobiology
Muhammad Adnan Khalid, Muhammad Mubeen, Maria Mukhtar, Poshmal Sumreen, Bushra Naz, Firdevs Aydın, Demet Asil, Azhar Iqbal
Apart from biocompatibility, ZnO quantum dots (QDs) are considered to be an efficient luminescence material due to their low cost and high redox potential. Here, we report the synthesis of ZnO QDs by using five different functionalizing ligands like mercaptoacetic acid (MAA), 3-mercaptopropionic acid (MPA), octadecene (ODE), ethylene glycol (EG), and oleyl amine (OLA) and fabricate their assemblies with graphene oxide (GO). We investigate the role of functionalizing ligands as a surface modifier of ZnO QDs for their attachment to GO...
November 14, 2023: Photochemistry and Photobiology
Deepa Sebastian, Kala Ramakrishnan
A biocompatible fluorescence sensor for cysteine detection receives wide appreciation recently, because of its importance in the medical field. Functionalized graphene quantum dots (GQDs) are recently emerging biocompatible quantum dots, which are considered as suitable candidates for biomolecule detection. Motivated by this concept, here we have developed a versatile fluorescent probe based on 3-aminocoumarin (AMC) functionalized GQDs for the detection of cysteine (Cys). Modification on GQD with AMC resulted in a stable fluorescent probe with an enhancement in quantum yield of about 84% and 40 nm redshift in emission peak compared with bare GQD...
November 13, 2023: Photochemistry and Photobiology
Jonathan Gressel
A triple-peaked UV-blue photoacceptor was first found in fungi and nicknamed cryptochrome due to its being cryptic and found then only in cryptogamous plants. It was subsequently discovered in higher plants and even later in algae, insects, fish, amphibians, and mammals including humans. Cryptochrome is the photoacceptor controlling a plethora of properties in all these systems.
November 10, 2023: Photochemistry and Photobiology
Maximilian Görlitz, Lennart Justen, Patrick J Rochette, Manuela Buonanno, David Welch, Norman J Kleiman, Ewan Eadie, Sachiko Kaidzu, William J Bradshaw, Emilia Javorsky, Nigel Cridland, Anat Galor, Martin Guttmann, Martina C Meinke, Johannes Schleusener, Paul Jensen, Per Söderberg, Nozomi Yamano, Chikako Nishigori, Paul O'Mahoney, Dieter Manstein, Rodney Croft, Curtis Cole, Frank R de Gruijl, Paul Donald Forbes, Stephen Trokel, John Marshall, David J Brenner, David Sliney, Kevin Esvelt
The COVID-19 pandemic underscored the crucial importance of enhanced indoor air quality control measures to mitigate the spread of respiratory pathogens. Far-UVC is a type of germicidal ultraviolet technology, with wavelengths between 200 and 235 nm, that has emerged as a highly promising approach for indoor air disinfection. Due to its enhanced safety compared to conventional 254 nm upper-room germicidal systems, far-UVC allows for whole-room direct exposure of occupied spaces, potentially offering greater efficacy, since the total room air is constantly treated...
November 6, 2023: Photochemistry and Photobiology
Chris Acquah, Zachary Pabis, Sourav Kanti Seth, Liraz Levi, Carlos E Crespo-Hernández
The development of a suitable irradiation setup is essential for in vitro experiments in photodynamic therapy (PDT). While various irradiation systems have been developed for PDT, only a few offer practical and high-quality setups for precise and reproducible results in cell culture experiments. This report introduces a cost-effective illumination setup designed for in vitro photodynamic treatments. The setup consists of a commercially available light-emitting diode (LED) lamp, a cooling unit, and a specially designed 3D-printed enclosure to accommodate a multiwell plate insert...
November 6, 2023: Photochemistry and Photobiology
(no author information available yet)
No abstract text is available yet for this article.
November 6, 2023: Photochemistry and Photobiology
Davi Jardim Martins, Jenny Kaur Singh, Tiya Jahjah, Alexandre Teixeira Vessoni, Giovana da Silva Leandro, Matheus Molina Silva, Denis Serge François Biard, Annabel Quinet, Carlos Frederico Martins Menck
Xeroderma pigmentosum (XP) variant cells are deficient in the translesion synthesis (TLS) DNA polymerase Polη (eta). This protein contributes to DNA damage tolerance, bypassing unrepaired UV photoproducts and allowing S-phase progression with minimal delay. In the absence of Polη, backup polymerases perform TLS of UV lesions. However, which polymerase plays this role in human cells remains an open question. Here, we investigated the potential role of Polι (iota) in bypassing ultraviolet (UV) induced photoproducts in the absence of Polη, using NER-deficient (XP-C) cells knocked down for Polι and/or Polη genes...
November 5, 2023: Photochemistry and Photobiology
Luiza Alves Diniz, Luiza de Almeida Queiroz Ferreira, Rafaela de Brito Ribeiro, Sarah Luiza Galvão de Jesus, Thales Augusto Anestino, Alisson Samuel Portes Caldeira, Giovanna Ribeiro Souto, Gleide Fernandes de Avelar, Flávio Almeida Amaral, Marcus Vinícius Lucas Ferreira, Mila Fernandes Moreira Madeira, Fernão Castro Braga, Ivana Márcia Alves Diniz
Natural products derived from plants can be used as photosensitizers for antimicrobial photodynamic therapy (aPDT) combining key therapeutic strategies for tissue repair while controlling microorganisms' growth. We investigated a standardized extract of pequi peels (Caryocar brasiliense Cambess) as a brownish natural photosensitizer for aPDT using blue light. Three concentrations of the pequi extract (PE; 10, 30, or 90 μg/mL) were tested solely or associated with blue laser (445 nm, 100 mW, 138 J/cm2 , 6 J, 60 s)...
November 1, 2023: Photochemistry and Photobiology
(no author information available yet)
No abstract text is available yet for this article.
October 30, 2023: Photochemistry and Photobiology
Luciana P Campagno, Ezequiel D Quiroga, Edgardo N Durantini, Fabiana L Alovero
Pseudomonas aeruginosa is one of the most refractory organisms to antibiotic treatment and appears to be one of the least susceptible to photodynamic treatment. TMPyP is effective in the photoinactivation of P. aeruginosa, and the co-administration with the cationic polymer Eudragit®-E100 (Eu) potentiates this effect against isolates both sensitive and resistant to antibiotics. The fluorescent population (>98%) observed by flow cytometry after exposure to Eu + TMPyP remained unchanged after successive washings, indicating a stronger interaction/internalization of TMPyP in the bacteria, which could be attributed to the rapid neutralization of surface charges...
October 26, 2023: Photochemistry and Photobiology
Qing Guo, Peiyuan Li, Ying Zhang, Hongjun Yan, Qiuyan Yan, Rixiang Su, Wei Su
Combined photothermal therapy (PTT) and photodynamic therapy (PDT) has emerged as a novel and effective antibacterial strategy. In order to endow titanium (Ti) with antibacterial properties, the Ti-PDA-Cur composite was prepared using the excellent adhesion properties of polydopamine (PDA) to load curcumin (Cur) on the surface of Ti. The Ti-PDA-Cur coating can produce singlet oxygen (1 O2 ) and heat under 405 + 808 nm light irradiation, which can effectively kill Staphylococcus aureus and Escherichia coli...
October 26, 2023: Photochemistry and Photobiology
Fetch more papers »
Fetching more papers... Fetching...
Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"

We want to hear from doctors like you!

Take a second to answer a survey question.