Asiatic Acid Glucosamine Salt Alleviates Ultraviolet B ‐induced Photoaging of Human Dermal Fibroblasts and Nude Mouse Skin
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - September 4, 2019 Category: Science Authors: Jia Huang, Tian Tu, Wenbo Wang, Guangdong Zhou, Wenjie Zhang, Xiaoli Wu, Wei Liu Tags: Research Article Source Type: research

Disinfection of Cariogenic Pathogens in Planktonic Lifestyle, Biofilm, and Carious Dentine with Antimicrobial Photodynamic Therapy
AbstractAntimicrobial photodynamic therapy (aPDT) has been recommended for clinical application. Its antibacterial effect on bacteria remained in dentinal tubule was seldom investigated. Here we evaluated the antibacterial effects of aPDT onStreptococcus mutans (S. mutans) andLactobacillus acidophilus (L. acidophilus) in planktonic lifestyle, biofilm, and carious dentine. Mono ‐species biofilms or dentinal caries formed on human dentine slices or slabs. Bacterial suspension, biofilms, and dentine caries were treated with 0.1 mg/mL Toluidine Blue O followed by irradiation with a light emission diode (λ– 635&p...
Source: Photochemistry and Photobiology - September 4, 2019 Category: Science Authors: Minjing Wu, Li Xu, Zhiyu Cai, Shan Huang, Yijun Li, Lishan Lei, Xiaojing Huang Tags: RESEARCH ARTICLE Source Type: research

Anticancer Photodynamic Therapy Properties of Sulfur ‐Doped Graphene Quantum Dot and Methylene Blue Preparations in MCF‐7 Breast Cancer Cell Culture
Graphene quantum dots are synthesized using a laser and then characterized. MCF ‐7 breast cancer cells in wells with media are treated with either graphene quantum dots, methylene blue or a 1:1 graphene quantum dot to methylene blue preparation. Wells are then irradiated with 660 nanometer red light which causes increased levels of singlet oxygen and reactive oxygen species. The methylene blue treated wells exhibit more cytotoxicity than the 1:1 combination compared to the control treatment, while the graphene quantum dot preparation does not cause significant cytotoxicity. AbstractPhotodynamic therapy (PDT) is a field w...
Source: Photochemistry and Photobiology - August 30, 2019 Category: Science Authors: Jerry D. Monroe, Ermek Belekov, Ali Oguz Er, Michael E. Smith Tags: Research Article Source Type: research

Long Wavelength Ultraviolet A1 and Visible Light Photoprotection: A Multimodality Assessment of Dose and Response
AbstractHuman skin is exposed to visible light (VL; 400 ‐700 nm) and long wavelength ultraviolet A1 (UVA1) radiation (370‐400 nm) after the application of organic broad‐spectrum sunscreens. The biologic effects of these wavelengths have been demonstrated; however, a dose response has not been investigated. Ten subjects with Fitzpatrick skin phototy pe IV‐VI were enrolled. Subjects were irradiated with 2 light sources (80‐480 J/cm2): one comprising VL with less than 0.5% UVA1 (VL+UVA1) and the other pure VL. Skin responses were evaluated for two weeks using clinical and spectroscopic assessments. 4 ‐mm punch bio...
Source: Photochemistry and Photobiology - August 29, 2019 Category: Science Authors: Indermeet Kohli, Taylor L. Braunberger, Amanda F Nahhas, Fatima N. Mirza, Mohsen Mokhtari, Alexis B. Lyons, Nikiforos Kollias, Eduardo Ruvolo, Henry W. Lim, Iltefat H. Hamzavi Tags: Research Article Source Type: research

The Impact of Sunlight on Adventitious Buying and Giving
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 28, 2019 Category: Science Authors: Brian Diffey Tags: Research Note Source Type: research

Wavelength ‐ and Tissue‐dependent Variations in the Mutagenicity of Cyclobutane Pyrimidine Dimers in Mouse Skin
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 28, 2019 Category: Science Authors: Hironobu Ikehata, Toshio Mori, Yasuhiro Kamei, Thierry Douki, Jean Cadet, Masayuki Yamamoto Tags: Research Article Source Type: research

Relation of Photochemical Internalization to Heat, pH and Ca2+ Ions
In this study, we examined the relation of PCI to heat, pH and Ca2+ ions using cell penetrating peptide (CPP) ‐cargo‐photosensitizer (Alexa546 or Alexa633) conjugates. A cell temperature changing experiment demonstrated that heat (thermal mechanism) does not significantly contribute to the photoinduced endosomal escape. Inhibition of V‐ATPase proton pump activity and endosomal pH upregulation indicate d that PCI‐mediated endosomal escape needs endosomal acidification prior to photoirradiation. Imaging of the CPP‐cargo‐photosensitizer and Ca2+ ions during photostimulation showed that intracellular calcium increa...
Source: Photochemistry and Photobiology - August 24, 2019 Category: Science Authors: Tet Htut Soe, Tomotaka Nanjo, Kazunori Watanabe, Takashi Ohtsuki Tags: Research Article Source Type: research

Protective Effects of Ginseng Proteins on Photoaging of Mouse Fibroblasts Induced by UVA
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 23, 2019 Category: Science Authors: Rui Jiang, Xiaohao Xu, Zhuo Sun, Fei Wang, Rui Ma, Kai Feng, Tong Li, Liwei Sun Tags: Research Article Source Type: research

Adrenocorticotropic Hormone and Cyclic Adenosine Monophosphate are Involved in the Control of Shark Bioluminescence
AbstractAmong Etmopteridae and Dalatiidae, luminous species use hormonal control to regulate bioluminescence. Melatonin (MT) triggers light emission and, conversely, alpha melanocyte stimulating hormone ( α‐MSH) actively reduces ongoing luminescence. Prolactin (PRL) acts differentially, triggering light emission in Etmopteridae and inhibiting it in Dalatiidae. Interestingly, these hormones are also known as regulators of skin pigment movements in vertebrates. One other hormone, the adrenocorticotr opic hormone (ACTH), also members of the skin pigmentation regulators, is here pharmacologically tested on the light em...
Source: Photochemistry and Photobiology - August 23, 2019 Category: Science Authors: Laurent Duchatelet, J érôme Delroisse, Nicolas Pinte, Keiichi Sato, Hsuan‐Ching Ho, Jérôme Mallefet Tags: Research Article Source Type: research

Predictors and Limitations of the Penetration Depth of Photodynamic Effects in the Rodent Brain
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 23, 2019 Category: Science Authors: Collin T. Inglut, Brandon Gaitan, Daniel Najafali, Irati Abad Lopez, Nina P. Connolly, Seppo Orsila, Robert Perttil ä, Graeme F. Woodworth, Yu Chen, Huang‐Chiao Huang Tags: Special Issue Research Article Source Type: research

Impact of Long ‐Wavelength Ultraviolet A1 and Visible Light on Light‐Skinned Individuals
This study demonstrates that VL + UVA1 induces clinically perceptible erythema. This is a novel finding since th e erythemogenic spectrum of sunlight has primarily been attributed to ultraviolet B and short wavelength ultraviolet A (320–340 nm). AbstractSolar radiation is known to be a major contributor to the development of skin cancer. Most sunscreen formulations, including those with broad spectrum, offer minimal protection in long ‐wavelength ultraviolet A1 (UVA1; 370–400 nm) and visible light (VL; 400–700 nm) domain. There is limited information regarding the impact of this...
Source: Photochemistry and Photobiology - August 23, 2019 Category: Science Authors: Indermeet Kohli, Raheel Zubair, Alexis B. Lyons, Amanda F. Nahhas, Taylor L. Braunberger, Mohsen Mokhtari, Eduardo Ruvolo, Henry W. Lim, Iltefat H. Hamzavi Tags: Letter To The Editor Source Type: research

Photobiomodulation Enhances Cisplatin Cytotoxicity in a Culture Model with Oral Cell Lineages
This study investigated whether photobiomodulation (PBM) can potentiate the effects of cisplatin on keratinocytes (HaCat) and cancer cells (SCC25 and HN12).Cells were treated with laser (GaAlAs; 660nm; 60mW; 0.33J; 2.14W/cm2; 11.7J/cm2 and 6s) and cisplatin (7.8 µg/mL) to evaluate cell viability,Ki‐67, VEGF, TGF‐β1, EGF expression, and ROS production. Observations were validated in the SCC25 cell lineage, where the type of cell death (necrosis/apoptosis) and the amount of ATP were assessed. Cell lineages showed increased sensitivity to cisplatin assoc iated with PBM (Cis‐PBM). Ki‐67 was augmented in all ...
Source: Photochemistry and Photobiology - August 19, 2019 Category: Science Authors: Ivana M.A. Diniz, Giovanna R. Souto, Iuri D.P. Freitas, Jos é Alcides A. de Arruda, Janine M. da Silva, Tarcília A. Silva, Ricardo A. Mesquita Tags: Research Article Source Type: research

Cancer Cell ‐targeted and Activatable Photoimmunotherapy Spares T Cells in a 3D Co‐culture Model
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 19, 2019 Category: Science Authors: Eric M. Kercher, Shubhankar Nath, Imran Rizvi, Bryan Q. Spring Tags: Special Issue Research Article Source Type: research

Effect of High Intensity Blue Light on Fusobacterium nucleatum Membrane Integrity
AbstractOral malodour is considered to be caused mainly by the production of volatile sulfide compounds (VSC) by anaerobic Gram ‐negative oral bacteria. Previous studies showed that these bacteria were susceptible to blue light phototoxicity mediated by the production of reactive oxygen species (ROS). In the present study, we tested the effect of blue light on the integrityFusobacterium nucleatum's membrane, cellular proteins and DNA. Bacterial samples were exposed to high intensity blue light for 0, 70, 140, and 280 sec (i.e. fluences of 0, 96, 192 and 384 J/cm2, respectively). Following light exposure bacterial samples...
Source: Photochemistry and Photobiology - August 13, 2019 Category: Science Authors: Uziel Jeffet, Rachel Shimon, Nir Sterer Tags: Research Article Source Type: research

Quantitative Effects of Pigmentation on the Re ‐absorption of Chlorophyll a Fluorescence and Energy Partitioning in leaves
This study comparatively examined spectroscopic features, photosynthetic parameters and energy partitioning in plants ofFittonia albivenis cv. Agyroneuraand Fittonia albivenis cv. Verschaffeltii with different pigmentation.Fittonia albivenis cv. Verschaffeltii, rich in anthocyanins, presented lower values than the green variety (cv. Agyroneura) for several parameters: the ratio chlorophyll a/b, the carotenoid content, the heat dissipation by non ‐photochemical quenching (NPQ) and the energy dependent component of the quantum yield of NPQ. Additionally, the red plant displayed higher resistance to water shortage. The spec...
Source: Photochemistry and Photobiology - August 13, 2019 Category: Science Authors: Brian Ospina Calvo, Maria Gabriela Lagorio Tags: Research Article Source Type: research

Effects of HVP Status on Responsiveness to Ionizing Radiation vs. Photodynamic Therapy in Head and Neck Cancer Cell lines
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 13, 2019 Category: Science Authors: David Kessel, Won Jin Cho, Joseph Rakowski, Harold E. Kim, Hyeong ‐Reh C. Kim Tags: Special Issue Research Article Source Type: research

Sun Protection Habits and Sun Exposure of Physical Education Teachers in the South of Spain
AbstractThe high prevalence and increasing incidence of skin cancer (SC) is a significant public health problem. We can address its main risk factor, which is incident and accumulated solar radiation, and its damages by disseminating knowledge and promoting changes in habits and attitudes towards the sun. The influence of teachers in the education of young people is crucial. Physical education teachers (PET), spend the majority of their time outdoors, thereby exposing themselves to solar radiation daily and greatly increasing the risk of SC.We carried out a case ‐control study matching for age and gender through surveys ...
Source: Photochemistry and Photobiology - August 13, 2019 Category: Science Authors: Guillermo De Castro ‐Maqueda, José V. Gutierrez‐Manzanedo, Jorge R. Fernandez‐Santos, Mario Linares‐Barrios, Magdalena De Troya Martín Tags: Research Article Source Type: research

Fast and Efficient Method to Obtain Tagitinin F by Photocyclization of Tagitinin C
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - August 10, 2019 Category: Science Authors: Victor Hugo Catricala Fernandes, Natalie de Barros Viera, Luiza Beatriz Lima Zanini, Aline de F átima Silva, Paula Pio de Oliveira Salem, Marisi Gomes Soares, Karen de Jesus Nicácio, Ana Claudia Chagas de Paula, Luciano Sindra Virtuoso, Tiago B Tags: Research Article Source Type: research

Photochemical Properties of trans ‐[Ru(NH3)4(bpa)(L)]2+ (L = py, isn, 4‐acpy or 4‐pic)
Photosubstitution processes in ruthenium amines of the typetrans‐[Ru(NH3)4LL ′]+2 where L are nitrogenous heterocyclic ligands, pyridine (py), isonicotinamide (isn), 4 ‐acetylpyridine (4‐acpy) and 4‐picoline (4‐pic) and the 1,2‐bis(4‐pyridyl)ethane (bpa) ligand, lead to the substitution of nitrogenous ligands by water molecules, however, this change is dependent on the wavelength used. The characteristic of the binder is also another factor to be consi dered since the process of labilization did not occur for all ligands, isn, and 4‐acpy, which gives these complexes photochemical stability and therefo...
Source: Photochemistry and Photobiology - August 1, 2019 Category: Science Authors: Wagner Batista Santos, Kelly Aparecida Encarna ção Amorim, Anderson Dourado Galvão, Fabricio Tarso Moraes, Dario Batista Fortaleza, Luiz Alfredo Pavanin Tags: Research Article Source Type: research

Thomas J. Dougherty: an Appreciation
This report summarizes his contributions to the field and illustrates the scope of discoveries that became feasible after his work brought PDT to the attention of others and to assorted funding agencies. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 29, 2019 Category: Science Authors: David Kessel Tags: Special Issue Invited Review Source Type: research

Relation of Photochemical Internalization to Heat, pH, and Ca2+ Ions
In this study, we examined the relation of PCI to heat, pH and Ca2+ ions using cell penetrating peptide (CPP) ‐cargo‐photosensitizer (Alexa546 or Alexa633) conjugates. A cell temperature changing experiment demonstrated that heat (thermal mechanism) does not significantly contribute to the photoinduced endosomal escape. Inhibition of V‐ATPase proton pump activity and endosomal pH upregulation indicate d that PCI‐mediated endosomal escape needs endosomal acidification prior to photoirradiation. Imaging of the CPP‐cargo‐photosensitizer and Ca2+ ions during photostimulation showed that intracellular calcium increa...
Source: Photochemistry and Photobiology - July 29, 2019 Category: Science Authors: Tet Htut Soe, Tomotaka Nanjo, Kazunori Watanabe, Takashi Ohtsuki Tags: Research Article Source Type: research

Significant Associations Between Sun Exposure and Adiposity Were Not Observed in Breast and Prostate Cancer Patients in a Cross ‐sectional Analysis
AbstractObesity is a significant health problem worldwide. Exposure to low dose ultraviolet radiation (like that in sunlight) suppresses the development of obesity in mice; however, the nature of the associations between sun exposure and adiposity is not well understood in humans. The present study characterized cross ‐sectional relationships between sun exposure and adiposity in a convenience cohort of breast (n=269; mean age=58 years) and prostate (n=78; mean age=69 years) cancer patients. Participants were enrolled in a 3‐month exercise program in Perth, Australia. Self‐reported questionnaires measured t ime spent...
Source: Photochemistry and Photobiology - July 29, 2019 Category: Science Authors: Gary D Zhang, Lucinda J Black, Matthew N Cooper, Robyn M Lucas, Shelley Gorman Tags: Research Article Source Type: research

Impact of Long Wavelength Ultraviolet A1 and Visible Light on Light ‐Skinned Individuals
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 25, 2019 Category: Science Authors: Indermeet Kohli, Raheel Zubair, Alexis B. Lyons, Amanda F. Nahhas, Taylor L. Braunberger, Mohsen Mokhtari, Eduardo Ruvolo, Henry W. Lim, Iltefat H. Hamzavi Tags: Letter to the Editor Source Type: research

Two Consecutive Polar Amino Acids at the End of Helix E are Important for Fast Turnover of the Archaerhodopsin Photocycle
Threonine 164 (T164) and serine 165 (S165) residues of the archaerhodopsin (AR) fromHalorubrum sp.ejinoor (HeAR) are fully conserved in ARs and are likely involved in a hydrogen ‐bonding network at the end of the helix E where most microbial rhodopsins assume a “bent structure” as shown in blue box of the upper left image of AR2. Replacements of these two amino acid residues cause profound change toHeAR photocycle suggesting the involvement of the two amino acid residues in the photoreaction pathway despite they are far from the photoactive center. AbstractArchaerhodopsins (ARs) is one of the members of micro...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Xiong Geng, Gang Dai, Luomeng Chao, Durige Wen, Takashi Kikukawa, Tatsuo Iwasa Tags: Research Article Source Type: research

Issue Information
Photochemistry and Photobiology, Volume 95, Issue 4, Page 909-910, July/August 2019. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Tags: Issue Information Source Type: research

Redshifted and Near ‐infrared Active Analog Pigments Based upon Archaerhodopsin‐3
In this study, we investigated the effect of analogs of the native ligand all ‐trans retinal A1 on the spectral properties and proton ‐pumping activity of AR3 and its single mutant AR3 (F229S). While, surprisingly, the 3‐methoxyretinal A2 analog did not redshift the absorbance maximum of AR3, the analogs retinal A2 and 3‐methylamino‐16‐nor‐1,2,3,4‐didehydroretinal (MMAR) did generate active redshifted AR3 pigments. T he MMAR analog pigments could even be activated by near‐infrared light. Furthermore, the MMAR pigments showed strongly enhanced fluorescence with an emission band in the near‐infrared peaki...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Srividya Ganapathy, Svenja Kratz, Que Chen, Klaas J. Hellingwerf, Huub J.M. Groot, Kenneth J. Rothschild, Willem J. Grip Tags: Research Article Source Type: research

Erythemal UV Radiation on Days with Low UV Index Values —an Analysis of Data from the German Solar UV Monitoring Network over a Ten‐year Period
Current WHO guidance for sun exposure on days with Global Solar UV Index (UVI) values of less than 3 does not see any need for sun protection on these days. Contrary to this, our analysis of erythemal irradiance data of such days from the German solar UV monitoring network shows that doses resulting from exposure of only two hours around solar noon can be sufficient to induce erythema in fair ‐skinned people on days with UVI values of 2, thereby questioning the WHO claim of harmlessness for this part of the low exposure category of the UVI. AbstractAccording to the World Health Organization and partner organizations, no ...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Maria Lehmann, Henner Sandmann, Annette B. Pfahlberg, Wolfgang Uter, Olaf Gefeller Tags: Research Article Source Type: research

UV ‐Vis Spectroscopy Reveals a Correlation Between Y263 and BV Protonation States in Bacteriophytochromes
Biliverdin (grey) and Y263 (teal) undergo parallel deprotonation events, requiring a four ‐pKa model to describe the pH ‐induced transition. Biliverdin and tyrosine each have two pKas due to reciprocal stabilization of the charges (positive for biliverdin and negative for Y263) that occurs within a selective pH range. AbstractRed ‐light photosensory proteins, phytochromes, link light activation to biological functions by interconverting between two conformational states. For this, they undergo large‐scale secondary and tertiary changes which follow small‐scale Z to E bond photoisomerization of the covalently boun...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Jessica A. Rumfeldt, Heikki Takala, Alli Liukkonen, Janne A. Ihalainen Tags: Research Article Source Type: research

Effects of Ultraviolet Radiation (UV ‐A+UV‐B) on the Antioxidant Metabolism of the Red Macroalga Species Acanthophora spicifera (Rhodophyta, Ceramiales) From Different Salinity and Nutrient Conditions
This study evaluated the antioxidant responses of two algal populations ofA.  spicifera adapted to different abiotic conditions when exposed to ultraviolet ‐A+ultraviolet‐B radiation (UV‐A+UV‐B). Experiments were performed using the water at two collection points for 7 days of acclimatization and 7 days of exposure to UVR (3 h per day), followed by metabolic analyses. At point 1, water of 30 ± 1 practical salinity unit (psu) had concentra tions of 1.06 ± 0.27 mm NH4+, 8.47  ± 0.01 mm NO3 −, 0.17 ± 0.01 mm PO...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: D ébora Tomazi Pereira, Bárbara Pereira, Alessandra Fonseca, Fernanda Ramlov, Marcelo Maraschin, Félix Álvarez‐Gómez, Felix L. Figueroa, Éder Carlos Schmidt, Zenilda Laurita Bouzon, Carmen Simioni Tags: Research Article Source Type: research

Ferrochelatase Deficiency Abrogated the Enhancement of Aminolevulinic Acid ‐mediated Protoporphyrin IX by Iron Chelator Deferoxamine
Iron chelator deferoxamine (DFO) significantly augmented ALA ‐mediated PpIX fluorescence and PDT response in MCF10A breast epithelial cells and SkBr3 breast cancer cells. Reducing FECH level by silencingFECH expression completely abolished the enhancement effect of DFO. AbstractAminolevulinic acid (ALA) is a prodrug that is metabolized in the heme biosynthesis pathway to produce protoporphyrin IX (PpIX) for tumor fluorescence detection and photodynamic therapy (PDT). The iron chelator deferoxamine (DFO) has been widely used to enhance PpIX accumulation by inhibiting the iron ‐dependent bioconversion of PpIX to heme, a ...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Pratheeba Palasuberniam, Daniel Kraus, Matthew Mansi, Alexander Braun, Richard Howley, Kenneth A. Myers, Bin Chen Tags: Research Article Source Type: research

A Cyanine Photooxidation/ β‐Elimination Sequence Enables Near‐infrared Uncaging of Aryl Amine Payloads
Chemical optimization leads to a novel reaction sequence —cyanine photooxidation followed byβ‐elimination—for near‐infrared uncaging. AbstractUncaging strategies that use near ‐infrared wavelengths can enable the highly targeted delivery of biomolecules in complex settings. Many methods, including an approach we developed using cyanine photooxidation, are limited to phenol‐containing payloads. Given the critical role of amines in diverse biological processes, we sough t to use cyanine photooxidation to initiate the release of aryl amines. Heptamethine cyanines substituted with an aryl amine at the ...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Tsuyoshi Yamamoto, Donald R. Caldwell, Albert Gandioso, Martin J. Schnermann Tags: Research Article Source Type: research

Photo ‐Modification of Melanin by a Mid‐infrared Free‐electron Laser
This study proposes the potency of intense mid‐infrared laser as novel alternative way to reduce melanin. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Takayasu Kawasaki, Aomi Sato, Yuki Tominaga, You Suzuki, Takahiro Oyama, Makoto Tadokoro, Koichi Tsukiyama, Kiyoshi Nokihara, Heishun Zen Tags: Research Article Source Type: research

NLOphoric Triphenylamine Derived Donor ‐π‐Acceptor‐π‐Donor Based Colorants: Synthesis, Spectroscopic, Density Functional Theory and Z‐scan Studies
Three dyes (5a ‐c) with D‐π‐A‐π‐D structural motif were synthesized and investigated for their photophysical and nonlinear optical behavior. The photophysical behavior of 5a‐c were affected by the polarity of the medium and hence showed solvatochromism. The linear and non‐linear optical properties of the dyes obtained using the spectroscopic and computational methods were affected by different N‐substituted secondary donors used and the polarity of the solvent. The magnitude of nonlinear absorption coefficient (β), the magnitude of nonlinear refraction (n2) and third order nonlinear susceptibilit...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Manish M. Raikwar, Elizabeth Mathew, Manu Varghese, Issac H. Joe, Sekar Nagaiyan Nethi Tags: Research Article Source Type: research

Sunshine is an Important Determinant of Vitamin D Status Even Among High ‐dose Supplement Users: Secondary Analysis of a Randomized Controlled Trial in Crohn's Disease Patients
This study was a secondary analysis of an RCT of 92 Crohn's disease patients in remission (49% female, median age  = 44). Participants were randomized to 2000 IU day−1 of vitamin D3 or placebo for 1 year, with 25 ‐hydroxyvitamin D (25(OH)D) being measured at baseline and every 4 months. Based on participant's place of residence, daily ambient UVB dose at wavelengths that can induce vitamin D synthesis (D‐UVB) was obtained. Cumulative and weighted ambient D‐UVB (cw‐D‐UVB) exposure prior to each blo od draw was calculated for each participant. Linear regression analysis and multilevel...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Fiona O'Sullivan, Tara Raftery, Michiel Weele, Jos Geffen, Deirdre McNamara, Colm O'Morain, Nasir Mahmud, Dervla Kelly, Martin Healy, Maria O'Sullivan, Lina Zgaga Tags: Research Article Source Type: research

Differential Photosynthetic Response of a Green Tide Alga Ulva linza to Ultraviolet Radiation, Under Short ‐ and Long‐term Ocean Acidification Regimes
We investigate the response ofUlva linza to UV radiation in the form of photosynthetically active radiation or PAB radiation. Radiation exposures were assessed following long ‐term and short‐term OA treatments. Results showed that increased CO2 decreased the damage and repair rate of thalli grown under short ‐term OA conditions with PAB treatment. In thalli, k was increased following PAB treatment at long‐term OA conditions. These results show that blooming algae may be more sensitive to UV radiation in marine environments, but it can develop effective mechanisms to offset the negative effects, refl ecting acclimat...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Jing Ma, Wen Wang, Liming Qu, Xiaoyan Liu, Zhiqin Wang, Sen Qiao, Hailong Wu, Guang Gao, Juntian Xu Tags: Research Article Source Type: research

Efficient Photooxidation of Aryl(hetaryl)pyrazolines by Benzoquinone
Photooxidation of aryl(hetaryl)pyrazolines in the presence of benzoquinone in organic solvents undergoes at high rate and provides the corresponding pyrazoles in a good yields. The effects of the solvent, pyrazoline structure and oxygen provide definite information on the reaction pathway. AbstractPhotooxidation of aryl(hetaryl)pyrazolines in the presence of benzoquinone has been studied in organic solvents. This reaction occurs at high rate to provide the corresponding pyrazole in a good yield. The effects of the solvent, pyrazoline structure and oxygen provide definite information on the reaction pathway. It appears that...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Valery F. Traven, Ivan V. Ivanov, Sergei M. Dolotov, Artem N. Semakin, Dmitriy A. Cheptsov, Zarina Z. Mamirgova Tags: Research Article Source Type: research

Effect of Titanium Dioxide Film Thickness on Photocatalytic and Bactericidal Activities Against Listeria monocytogenes
The photocatalytic activity of TiO2 thin layers increases according to TiO2 film thickness to a threshold value close to 400  nm. The film thickness also influences positively the antibacterial activity even though the two strains ofListeria  monocytogenes (Lm ScottA and Lm ECL 136) showed different sensitivity to TiO2 photocatalysis. AbstractStructural, microstructural and bactericidal surface properties of TiO2‐coated glass substrates elaborated by reactive Radiofrequency sputtering are investigated. As pathogenic bacteria in biofilms are a major concern in food industries due to their growing resistance to c...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Marion Barthomeuf, Xavier Castel, Laurent Le Gendre, Justine Louis, Martine Denis, Christine Pissavin Tags: Research Article Source Type: research

Comparative Study of the Effects of Ferrochelatase ‐siRNA Transfection Mediated by Ultrasound Microbubbles and Polyethyleneimine in Combination with Low‐dose ALA to Enhance PpIX Accumulation in Human Endometrial Cancer Xenograft Nude Mice Models
Red fluorescence caused by the accumulation of PpIX in endometrial cancer xenografts in nude mice after high ‐dose ALA injection could be detected easily byin  vivo animal imaging system, but low ‐dose ALA (1.0 mg kg−1) was injected into xenografts, there was no red fluorescence of tumor. However, knockdown of FECH in nude mice was performed by transfection with FECH ‐siRNA mediated by PEI and ultrasound microbubbles alone or in combination, then 1.0 mg kg−1 ALA was injected, apparent red fluorescence of the xenografts was observed, and the fluorescence intensity was PEI+ ultrasou...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Xian Zhang, Longfei Chen, Lvfen Gao, Xuesong Gao, Nan Li, Yuwei Song, Xinke Huang, Shaoqiang Lin, Xiaoyu Wang Tags: Research Article Source Type: research

Photostability of Terbinafine Under UVA Irradiation: The Effect of UV Absorbers
In this study, an in ‐depth investigation of the photostability of terbinafine, in both solutions and formulations, was conducted, taking into account the presence of UV absorbers such as TiO2, ZnO, avobenzone, 3 ‐(4‐methylbenzylidene)camphor, octocrylene, benzophenone‐1 and benzophenone‐2. The clear photocatalytic degradation of terbinafine in ethanol solution was observed in the presence of TiO2 and/or ZnO. In other cases, terbinafine was stable, with the exception of, in the presence of octocrylene. The presumed degradation products of terbinafine were identified for the first time using LC/MS/MS, and transfor...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Agata Kryczyk ‐Poprawa, Paweł Żmudzki, Paulina Koczurkiewicz, Elżbieta Pękala, Urszula Hubicka Tags: Research Article Source Type: research

Influence of Air Temperature on the UV Exposure of Different Body Sites Due to Clothing of Young Women During Daily Errands
In this study, clothing habits of young females were investigated in dependence of meteorological conditions. A body chart and a coding scheme were developed to indicate the exposed body sites. Results showed that air temperature is the dominating factor for UVR exposure. With increasing temperature, the first area of the body to be exposed to UVR, aside from face and hands, was the d écolleté, followed by nape, ankles, instep and forearms. Observations also indicate that the frequency of people's being outdoors decreases significantly at temperatures higher than 30°C. AbstractClothing is one of the main ...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Alois W. Schmalwieser, Veronika T. Schmalwieser, Susanne S. Schmalwieser Tags: Research Article Source Type: research

Cutaneous Photoprotective Activity of a Short ‐term Ingestion of High‐Flavanol Cocoa: A Nutritional Intervention Study
In vivo and in  vitro studies have shown that prolonged oral administration of flavanol‐rich cocoas extracts have photoprotective effects. We demonstrated that one‐week administration of 4–6 g of a new variety of naturally selected cocoa extract, rich in bioactive compounds, retains a dose‐dependent phot oprotective effect. This extract induced a statistically significant increase in the visual erythema threshold and a significant reduction in the “a” parameter. These results are also indicative of the fact that topical sunscreens could be supplemented by a specific diet. AbstractIn vivo a...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Piergiacomo Calzavara ‐Pinton, Irene Calzavara‐Pinton, Mariachiara Arisi, Maria Teresa Rossi, Giovanni Scapagnini, Sergio Davinelli, Marina Venturini Tags: Research Article Source Type: research

Photoprotective and Antigenotoxic Effects of the Flavonoids Apigenin, Naringenin and Pinocembrin
Plant polyphenols reduced UVB ‐induced DNA photoproducts in human cells. AbstractThis work evaluated the photoprotective and antigenotoxic effects against ultraviolet B (UVB) radiation of flavonoid compounds apigenin, naringenin and pinocembrin. The photoprotective efficacy of these compounds was estimated usingin vitro photoprotection indices, and the antigenotoxicity against UVB radiation was evaluated using the SOS chromotest and an enzymatic (proteinase K/T4 endonuclease V enzyme) comet assay in UV ‐treatedEscherichia coli and human (HEK ‐293) cells, respectively. Naringenin and pinocembrin showed maximum UV‐ab...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Adriana Garc ía Forero, Diego Armando Villamizar Mantilla, Luis A. Núñez, Raquel Elvira Ocazionez, Elena E. Stashenko, Jorge Luis Fuentes Tags: Research Article Source Type: research

Seasonal Minimum and Maximum Solar Ultraviolet Exposure Measurements of Classroom Teachers Residing in Tropical North Queensland, Australia
Personal erythemally effective exposure of classroom teachers in tropical Townsville (19.3 °S) was measured to establish seasonal extremes in exposure behavior. Mean daily personal exposure was higher in winter (91.2 J m‐2, 0.91 Standard Erythema Dose [SED]) than summer (63.3  J m−2, 0.63 SED). The range of exposures represent personal exposures that approximate current national guidelines for Australian workers at the study latitude of approximately 1.2 SED (30  J m−2 effective to the International Commission on Non ‐Ionizing Radiation Protection). AbstractThe risk of kera...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Nathan J. Downs, Damien P. Igoe, Alfio V. Parisi, Olivia Taylor, Shari L. Lazzaroni, Alex Rawlings, Daniel R. Garz ón‐Chavez, Simone L. Harrison Tags: Research Article Source Type: research

Bystander Me45 Melanoma Cells Increase Damaging Effect in UVC ‐irradiated Cells
The present studies were focused on response of malignant melanoma Me45 cells to UVC radiation and to bystander signals in coculture system. Changes in nonirradiated cells revealed as reduced clonogenic survival, apoptosis and premature senescence. In a feedback response, bystander cells caused increase of damaging effect in directly UVC exposed cells that elicited as decrease of clonogenic cells survival and increase of apoptosis ( “reverse damaging bystander effect”). The superoxide, NO and TGF‐β generated in and secreted by bystander cells seem to be engaged in this processes. Pretreatment of bystande...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Aleksandra Krzywon, Maria Widel Tags: Research Article Source Type: research

Photocatalytic Degradation of a Chlorinated Organic Chemical Using Activated Carbon Fiber Coupled with Semiconductor
A reusable photocatalyst developed based on activated carbon fibre and semiconductor was successfully utilized for degradation of 2, 4 ‐dichlorophenol which is priority pollutant listed by US EPA. Degradation efficiency of 94.3% was achieved when ratio of pollutant to Zn load was 1.37:1. Photogenerated holes were identified to be the prime species responsible for degradation. Leaching of Zn2+ into the solution was found to be 0.199  µg mL−1. Further, seed germination studies proved that ZnO could be used for plant growth. AbstractHydrothermal mediated synthesis was used to couple activated carbon fi...
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Authors: Ashitha Gopinath, Kadirvelu Krishna Tags: Research Article Source Type: research

Issue Information
Photochemistry and Photobiology, Volume 95, Issue 4, Page 909-910, July/August 2019. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 19, 2019 Category: Science Tags: Issue Information Source Type: research

Assessment of Biologically Effective Solar Ultraviolet Exposures for Court Staff and Competitors During a Major Australian Tennis Tournament
This study remotely assesses the effective ultraviolet exposures in response to the increased sun safety awareness at a major summertime tennis tournament in Australia. The assessment only uses publicly accessible data and information. It was found that tournament organizers have effectively adopted sun ‐safe protocols into the uniform policy that the court officials (judges and ball kids) are mandated to follow. The combination of sun‐participant geometry and the photoprotection provided by uniforms significantly reduced the ambient ultraviolet exposure, which was recorded to be as high as 9.9  SED h−1...
Source: Photochemistry and Photobiology - July 17, 2019 Category: Science Authors: Damien P. Igoe, Abdurazaq Amar, Peter Schouten, Alfio V. Parisi, Joanna Turner Tags: Research Article Source Type: research

Geometry Effects on Light ‐Harvesting Complex's Light Absorption and Energy Transfer in Purple Bacteria
Light ‐harvesting complexes (LHC) in photosynthetic organisms perform the major function of light absorption and energy transportation. We construct a geometric model ofRs. Molischianumin in which the geometric parameters such as ring diameter, fold symmetry order and dipole directions can be modified. We study how the absorption spectrum and energy transfer rate of the LHC depend on different geometric parameters. Our results here may find applications in designing highly efficient photovoltaic cell and other artificial photosynthetic systems. AbstractLight ‐harvesting complexes (LHC) in photosynthetic organisms perfo...
Source: Photochemistry and Photobiology - July 17, 2019 Category: Science Authors: Lingyu Zeng, Zeyang Liao, Xue ‐hua Wang Tags: Research Article Source Type: research

Nano ‐WO3‐SO3H as a New Photocatalyst Insight Through Covalently Grafted Brønsted Acid: Highly Efficient Selective Oxidation of Benzyl Alcohols to Aldehydes
This article is protected by copyright. All rights reserved. (Source: Photochemistry and Photobiology)
Source: Photochemistry and Photobiology - July 16, 2019 Category: Science Authors: Saber Hosseini, Ali Amoozadeh, Yasaman Akbarzadeh Tags: Research Article Source Type: research