Photochemistry and Photobiology

Cover image for Vol. 90 Issue 6

Edited By: Jean Cadet

Impact Factor: 2.684

ISI Journal Citation Reports © Ranking: 2013: 36/74 (Biophysics); 161/291 (Biochemistry & Molecular Biology)

Online ISSN: 1751-1097

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  • RESEARCH ARTICLE: The Employment of a Removable Chitosan-Derivatized Polymeric Sensitizer in the Photooxidation of Polyhydroxylated Water-Pollutants

    RESEARCH ARTICLE: The Employment of a Removable Chitosan‐Derivatized Polymeric Sensitizer in the Photooxidation of Polyhydroxylated Water‐Pollutants

    Changes in the UV-Vis absorption spectrum of a pH 4.75 aqueous solution of 1,2,4-THB plus CH-RB (A561 = 0.6) vs CH-RB (A561 = 0.6). Inset: Absorbance decrease of the described system as a function of photoirradiation time, monitored at 291 nm.

  • RESEARCH ARTICLE:Sun protection Provided by Regulation School Uniforms in Australian Schools: An Opportunity to Improve Personal Sun protection During Childhood

    RESEARCH ARTICLE:Sun protection Provided by Regulation School Uniforms in Australian Schools: An Opportunity to Improve Personal Sun protection During Childhood

    Body maps with predetermined percentages allocated to specific body regions and used to calculate body surface area (BSA) covered by regulation school uniforms. Body maps and predetermined percentages were adapted from publications 44–46.

  • RESEARCH ARTICLE: Simultaneous Irradiation with Different Wavelengths of Ultraviolet Light has Synergistic Bactericidal Effect on Vibrio parahaemolyticus

    RESEARCH ARTICLE: Simultaneous Irradiation with Different Wavelengths of Ultraviolet Light has Synergistic Bactericidal Effect on Vibrio parahaemolyticus

    Bactericidal effect of Vibrio parahaemolyticus by UV irradiations. Bactericidal effect was determined with a colony-forming assay and evaluated using survival ratios. Irradiation protocols were divided into UVA-LED alone, UVC alone, and sequential or simultaneous irradiation by UVA-LED and UVC. Addition (UVA + C) calculated the additional survival ratio of UVA-LED alone plus UVC in each independent experiment. The synergy of the combined irradiation is indicated beneath the dashed line. Values are shown as means ± SD (n = 4, n = number of independent replicates). (*) P < 0.05.

  • INVITED REVIEW: Chemical and Biological Mechanisms of Pathogen Reduction Technologies

    INVITED REVIEW: Chemical and Biological Mechanisms of Pathogen Reduction Technologies

    Illustrated summary of photochemical mechanisms for Theraflex UVC, Mirasol, Intercept and Theraflex methylene blue (MB) pathogen reduction technologies.

  • RESEARCH ARTICLE: Retarded Photooxidation of Cyamemazine in Biomimetic Microenvironments

    RESEARCH ARTICLE: Retarded Photooxidation of Cyamemazine in Biomimetic Microenvironments

    Photooxidation of (−)-CMZ in different media.

  • RESEARCH ARTICLE: Pointsource” Delivery of a Photosensitizer Drug and Singlet Oxygen: Eradication of Glioma Cells In Vitro

    RESEARCH ARTICLE: Pointsource” Delivery of a Photosensitizer Drug and Singlet Oxygen: Eradication of Glioma Cells In Vitro

    Pointsource device for targeted singlet oxygen delivery: (a) Red laser light and oxygen gas traveled through the hollow fiber optic and emerged from the probe tip. We used 200 mW output from a 669 nm laser and a O2 gas flow rate of ~0.2 ppm min−1 through the probe tip. The probe tip was held vertically in a perpendicular orientation above the cells so as not to kill them by mechanical action. (b) The fiber is equipped with a 5 × 10 mm2 (d × l) pheophorbide-modified silica tip with a photocleavable ethene linker. The probe design includes a covalently bound nonafluorosilane to improve sensitizer photorelease into the surrounding medium. (c) A view of the singlet oxygen-generating probe tip is shown with sensitizer photorelease and factors that relate to the glioma cell killing mechanism. The sensitizer traverses a relatively long 0.25 mm distance, which stands in contrast to the short ~150 nm diffusion distance of 1O2 in H2O. The sensitized production of 1O2 also occurs away from the probe tip through diffusion of the pheophorbide via light and O2 delivered from the probe tip.

  • RESEARCH ARTICLE: The Employment of a Removable Chitosan‐Derivatized Polymeric Sensitizer in the Photooxidation of Polyhydroxylated Water‐Pollutants
  • RESEARCH ARTICLE:Sun protection Provided by Regulation School Uniforms in Australian Schools: An Opportunity to Improve Personal Sun protection During Childhood
  • RESEARCH ARTICLE: Simultaneous Irradiation with Different Wavelengths of Ultraviolet Light has Synergistic Bactericidal Effect on Vibrio parahaemolyticus
  • INVITED REVIEW: Chemical and Biological Mechanisms of Pathogen Reduction Technologies
  • RESEARCH ARTICLE: Retarded Photooxidation of Cyamemazine in Biomimetic Microenvironments
  • RESEARCH ARTICLE: Pointsource” Delivery of a Photosensitizer Drug and Singlet Oxygen: Eradication of Glioma Cells In Vitro

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The known O2(1g)-sensitizer system Chitosan-bounded-Rose Bengal (CH-RB), with the dye immobilized by irreversible covalent bonding to the polymer Chitosan (CH) is soluble in aqueous acidic medium. CH-RB was employed as a photosensitizer in solution for the O2(1g)-mediated photodegradation of tri-hydroxybenzene water-contaminants (THBs). The polymeric sensitizer, totally insoluble in neutral medium, can be removed from the solution after the photodegradation cycle by precipitation through a simple pH change. The described arrangement mimics, as closely as possible, a scenery consisting of a confined polluted water system in the presence of oxygen, visible light and a removable RB-derivative as a dye-sensitizer. For details see the paper “The employment of a removable chitosan-derivatized polymeric sensitizer in the photooxidation of polyhydroxylated water-pollutants” by Gabriela Ferrari and coworkers on pages 1251 – 1256 in this number. The results are further discussed in a Highlight paper by Niluksha Walalawela and Alexander Greer on pages 1216 – 1218.
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