Photochemistry and Photobiology

Cover image for Vol. 92 Issue 1

Early View (Online Version of Record published before inclusion in an issue)

Edited By: Jean Cadet

Impact Factor: 2.266

ISI Journal Citation Reports © Ranking: 2014: 44/73 (Biophysics); 184/290 (Biochemistry & Molecular Biology)

Online ISSN: 1751-1097

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  1. 1 - 11
  1. Research Articles

    1. The Involvement of Splicing Factor hnRNP A1 in UVB-induced Alternative Splicing of hdm2

      Jianguo Feng, Li Li, Lingying Tong, Liling Tang and Shiyong Wu

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12564

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      hnRNP A1 mediates UVB-induced alternative splicing of hdm2 and apoptosis.

    2. Stereoselective Self-Aggregation of 31-Epimerically Pure Amino Analogs of Zinc Bacteriochlorophyll-d in an Aqueous Micelle Solution

      Hiroaki Watanabe, Tadashi Mizoguchi and Hitoshi Tamiaki

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12562

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      31-Epimers of bacteriochlorophyll -d amino analogs self-aggregated in an aqueous micelle solution to form large oligomers. The self-aggregates were deaggregated by addition of a surfactant or an acid to give 31N-protonated monomers. Both the aggregation and deaggregation were controlled on the 31-stereochemistry.

    3. Inactivation by Pulsed Light of Bacillus subtilis Spores with Impaired Protection Factors

      Julia Esbelin, Sabine Malléa, Gérémy Clair and Frédéric Carlin

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12568

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      Inactivation rates of intact (●) and decoated (∆) spores of Bacillus subtilis 168 and of B. subtilis cotE (○) mutant strain exposed to pulsed light (A) and continuous UV-C (B). Spores lacking coats or the coat protein CotE were more sensitive to pulsed light. In contrast their resistance to UV-C was not affected.

    4. The Triplet State of 6-thio-2′-deoxyguanosine: Intrinsic Properties and Reactivity Toward Molecular Oxygen

      Marvin Pollum, Luis A. Ortiz-Rodríguez, Steffen Jockusch and Carlos E. Crespo-Hernández

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12563

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      6-thio-2′-deoxyguanosine is a common metabolite of the widely prescribed thiopurine prodrugs. The triplet state of 6-thio-2′-deoxyguanosine is populated upon UVA absorption, which can lead to cytotoxic side-effects. A mechanism is presented wherein the interaction between the triplet state of 6-thio-2′-deoxyguanosine and molecular oxygen leads to two competitive pathways—triplet-energy transfer or the formation of a charge-transfer complex. The former pathway generates singlet oxygen, whereas the latter decays back to the ground state. The identification of these two competitive relaxation pathways can assist in evaluating the primary mode of photosensitization that leads to the phototoxicity of 6-thio-2′-deoxyguanosine in biological environments.

    5. Comparison of UV Protection Properties of Cotton Fabrics Treated with Aqueous and Methanolic Extracts of Achyranthes aspera and Alhagi maurorum Plants

      Ahsan Nazir, Muhammad Asad Saleem, Faiza Nazir, Tanveer Hussain, Muhammad Qasim Faizan and Muhammad Usman

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12566

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      Application of extracts from some plants on clothes can protect the wearer from dangerous ultraviolet radiations.

  2. Rapid Communication

    1. Actinic Prurigo in Singaporean Chinese: A Positive Association with HLA-DRB1*03:01

      Qiping Chen, Meixin Shen, Yee Kiat Heng, Thiam Seng Colin Theng, Hong Liang Tey, Ee Chee Ren and Wei-Sheng Chong

      Article first published online: 11 FEB 2016 | DOI: 10.1111/php.12569

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      Studies have reported the association of human leukocyte antigen (HLA) genes with susceptibility to develop actinic prurigo (AP) in Caucasians, but there were no studies in Asian populations, including the Chinese. Our study was performed to determine if AP is associated with susceptibility or protective HLA alleles or haplotypes in Singaporean Chinese. We found that HLA-DRB1*03:01 was associated with AP in Singaporean Chinese patients. This novel allelic association may possibly be utilized as a biological marker to aid in the diagnosis of AP in Chinese patients.

  3. Research Articles

    1. Enhanced Photocatalytic Degradation of 17α-Ethinylestradiol Exhibited by Multifunctional ZnFe2O4–Ag/rGO Nanocomposite Under Visible Light

      Nirina Khadgi, Yi Li, Akhanda Raj Upreti, Chi Zhang, Wenlong Zhang, Yuming Wang and Dawei Wang

      Article first published online: 3 FEB 2016 | DOI: 10.1111/php.12565

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      ZnFe2O4–Ag/rGO nanocomposite (NC) was fabricated by facile hydrothermal method. The efficiency of the nanocomposite was tested under visible light by degrading a nondye compound, 17α-ethinylestradiol, which is known to have endocrine-disrupting properties. Modification of ZnFe2O4 by addition of Ag nanoparticles (NP) and reduced graphene oxide (rGO) enhanced the photocatalytic efficiency. Moreover, the composite can easily be separated magnetically and reused. The competitive interaction of humic acid resulted in reduced removal of the model compound overshadowing its photosensitization.

    2. Can Mycosporine-Like Amino Acids Act as Multifunctional Compounds in Gymnodinium catenatum (Dinophyceae)?

      Paulo Vale

      Article first published online: 3 FEB 2016 | DOI: 10.1111/php.12561

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      MAA's stability to hydrogen peroxide, heat and light was dependent on the respective chemical structure. The unknown M-370 was undistinguishable from palythene (an MAA with a double bound absorbing in near-UVA) in chemical and photochemical stability. High polar MAAs, such as shinorine and porphyra-334 were rapidly lost upon hypoosmotic shock, in a concentration dependent manner, and can probably have an osmolyte role. The MAAs mycosporine-glycine and palythene increased upon hypoosmotic shock, indicating the need of an antioxidant response upon stress.

    3. Fiber-Optic Probes for Small-Scale Measurements of Scalar Irradiance

      Lars Fledelius Rickelt, Mads Lichtenberg, Erik Christian Løvbjerg Trampe and Michael Kühl

      Article first published online: 2 FEB 2016 | DOI: 10.1111/php.12560

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      Total radiant flux from all directions around a point is called the fluence rate (or scalar irradiance) and is an important parameter in photosynthesis and photodynamic therapy studies. It can be measured by fiber-optic probes with spherical measuring tips that collect light isotropically. We describe a new method for manufacturing such fiber probes, and the measuring characteristics of these new probes are compared to existing types made by other procedures. With the new method, it is possible to produce fluence rate fiber probes with spherical tip diameters down to 30 µm on tapered fibers and up to 600 µm on untapered fibers.

    4. Synthesis, Characterization and Photocatalytic Activity of Ag+- and Sn2+-Doped KTi0.5Te1.5O6

      Ravinder Guje, Ravi Gundeboina, Jitta Raju Reddy, Naveen Kumar Veldurthi, Sreenu Kurra and Muga Vithal

      Article first published online: 1 FEB 2016 | DOI: 10.1111/php.12559

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      The structure of defect pyrochlore, ABB'O6, is built up of corner sharing BO6 (B'O6) octahedra creating networks of hexagonal BB'O6 tunnels as shown in figure. The “A” ions are present in these tunnels.

    5. Proteomonas sulcata ACR1: A Fast Anion Channelrhodopsin

      Elena G. Govorunova, Oleg A. Sineshchekov and John L. Spudich

      Article first published online: 1 FEB 2016 | DOI: 10.1111/php.12558

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      Natural channelrhodopsins with strictly anion selectivity and high unitary conductance (ACRs) were recently discovered in the alga Guillardia theta (Govorunova et al. Science 349:647–650. 2015). ACRs are of interest for their novel function and because they were shown to be highly efficient tools to inhibit neuronal firing with light. We characterize here a homolog present in the cryptophyte Proteomonas sulcata (PsuACR1), suggesting ACRs may be widespread in the cryptophyte phylum. Of importance for optogenetics, despite its 10-fold lower channel activity than the GtACRs, PsuACR1 exhibits a several fold faster channel closing and peak recovery uniquely enabling silencing high-frequency firing neurons.

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