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14 October 2009
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Themed Issue: Environmental effects of UV radiation
28 August 2009
The most recent advances in several specific aspects of environmental UV radiation in marine, freshwater, and terrestrial ecosystems are presented. Guest editor: Ruben Sommaruga
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15 July 2009
A collection of papers dedicated to Esther Oliveros. Guest editors: Marie-Thérčse Maurette and Guillermo Orellana
Contents list for Photochemical & Photobiological Sciences, issue 12, 2009
Front cover
Photochem. Photobiol. Sci., 2009, 8, 1629
DOI: 10.1039/b923761p
Contents and Highlights in Chemical Biology
Photochem. Photobiol. Sci., 2009, 8, 1631
DOI: 10.1039/b923762n
Perspective
A novel biomimetic photochemical switch at work: design of a photomodulable peptide
Adalgisa Sinicropi, Caterina Bernini, Riccardo Basosi and Massimo Olivucci,
Photochem. Photobiol. Sci., 2009, 8, 1639
DOI: 10.1039/b906271h
Structural and spectroscopic properties of a novel cyclic peptidomimetic, formed by a biomimetic Z/E photoisomerizable switch conjugated to the biologically active RGD peptide, are investigated in aqueous solution by means of molecular dynamics and quantum-mechanical/molecular-mechanic (CASPT2//CASSCF/AMBER) computations.
Papers
Enhanced efficiency of the visible-light photocatalytic hydrogen generation by the ruthenium tris(2,2
-bipyridyl)–methyl viologen system in the presence of cucurbit[n]urils
Cláudia Gomes Silva, Maykel de Miguel, Belén Ferrer, Mercedes Álvaro and Hermenegildo García,
Photochem. Photobiol. Sci., 2009, 8, 1650
DOI: 10.1039/b9pp00063a
The efficiency of photocatalytic H2 generation increases when cucurbiturils are present in solution. The efficiency enhancement is CB[6] < CB[7] < CB[8].
The photophysics of alloxazine: a quantum chemical investigation in vacuum and solution
Susanne Salzmann and Christel M. Marian,
Photochem. Photobiol. Sci., 2009, 8, 1655
DOI: 10.1039/b9pp00022d
We show that the decay mechanism of the optically bright 1(
HL*) state of alloxazine depends strongly on the polarity and hydrogen-bonding ability of the solvent. For the gas-phase and in nonpolar solvents we predict complete quenching of the fluorescence, whereas in aqueous solution a competition between fluorescence and intersystem crossing to the T2 and T3 states is found.
Kinetics of reversible photoisomerization: determination of the primary quantum yields for the E–Z photoisomerization of silylenephenylenevinylene derivatives
Malgorzata Bayda, Gordon L. Hug, Jakub Lukaszewicz, Mariusz Majchrzak, Bogdan Marciniec and Bronislaw Marciniak,
Photochem. Photobiol. Sci., 2009, 8, 1667
DOI: 10.1039/b907242j
A method is presented for determining the primary photochemical quantum yields in photoreversible reactions. With this method it is possible to get both forward and reverse quantum yields starting with either isomer.
A novel elsinochrome A derivative: a study of drug delivery and photodynamic activity
Yang Zhang, Jie Xie, Luyong Zhang, Cong Li, Hongxia Chen, Ying Gu and Jingquan Zhao,
Photochem. Photobiol. Sci., 2009, 8, 1676
DOI: 10.1039/b9pp00046a
A novel elsinochrome A (EA) derivative, 5-(3-mercapto-1-propanesulfonic acid)-substituted elsinochrome A (MPEA), with an amphiphilicity was designed and synthesized by considering drug delivery and biological activity requirements.
Fluence rate-dependent intratumor heterogeneity in physiologic and cytotoxic responses to Photofrin photodynamic therapy
Theresa M. Busch, Xiaoman Xing, Guoqiang Yu, Arjun Yodh, E. Paul Wileyto, Hsing-Wen Wang, Turgut Durduran, Timothy C. Zhu and Ken Kang-Hsin Wang,
Photochem. Photobiol. Sci., 2009, 8, 1683
DOI: 10.1039/b9pp00004f
Photofrin PDT at 75 mW cm-2 produces greater hypoxia and protection from cell kill at the base vs. surface of intradermal tumors. This heterogeneity is overcome by treatment at lower (25 mW cm-2) fluence rate.
Effect of bridgehead substitution on the fluorescence quenching of 2,3-diazabicyclo[2.2.2]oct-2-enes by solvents and antioxidants
Roland Meyer, Xiangyang Zhang and Werner M. Nau,
Photochem. Photobiol. Sci., 2009, 8, 1694
DOI: 10.1039/b9pp00081j
Simple bridgehead substitution in bicyclic azoalkanes allows the fine-tuning of fluorescent probes for antioxidants with respect to their reactivity, selectivity, and nucleophilicity.
Demetalation kinetics of natural chlorophylls purified from oxygenic photosynthetic organisms: effect of the formyl groups conjugated directly to the chlorin -macrocycle
Yuki Hirai, Hitoshi Tamiaki, Shigenori Kashimura and Yoshitaka Saga,
Photochem. Photobiol. Sci., 2009, 8, 1701
DOI: 10.1039/b9pp00018f
Demetalation kinetics of chlorophyll (Chl) d possessing 3-formyl group was slower than that of Chl a possessing 3-vinyl group, but faster than that of Chl b possessing 7-formyl group.
Encapsulation of 2-(4-N,N-dimethylamino)phenylimidazo[4,5-b]pyridine in 
-cyclodextrin: effect on H-bond-induced intramolecular charge transfer emission
Nihar Dash, Francis A. S. Chipem and G. Krishnamoorthy,
Photochem. Photobiol. Sci., 2009, 8, 1708
DOI: 10.1039/b9pp00023b
DMAPIP-b/-CD inclusion complex emits dual fluorescence with enhanced normal and ICT emission due to reduced polarity experienced by DMAPIP-b inside the cavity and hydrogen bonding of pyridine nitrogen with water.
Drug efflux transporters, MRP1 and BCRP, affect the outcome of hypericin-mediated photodynamic therapy in HT-29 adenocarcinoma cells
Rastislav Jend
elovský, Jaromír Mike
, Ján Koval', Karel Sou
ek, Ji
ina Procházková, Martin Kello, Veronika Saková, Jiina Hofmanová, Alois Kozubík and Peter Fedoroko,
Photochem. Photobiol. Sci., 2009, 8, 1716
DOI: 10.1039/b9pp00086k
Stimulation of MRP1 and BCRP expression by hypericin per se affected its accumulation and therefore HY-PDT efficiency, however this undesired effect was eliminated by pre-treatment with proadifen.
Photophysical properties and photodynamic activity of octacationic oxotitanium(IV) phthalocyanines
Nina Kuznetsova, Dmitry Makarov, Olga Yuzhakova, Anton Strizhakov, Yana Roumbal, Ludmila Ulanova, Alexander Krasnovsky and Oleg Kaliya,
Photochem. Photobiol. Sci., 2009, 8, 1724
DOI: 10.1039/b9pp00054b
Both singlet oxygen and hydroxyl radicals participate in bacterial cell killing and oxidation of organic substrates photosensitized by octacationic oxotitanium phthalocyanines in aqueous solutions.
Photochemical investigation of a photochromic diarylethene compound that can be used as a wide range actinometer
André Ribeiro Santos, Roberto Ballardini, Peter Belser, Maria Teresa Gandolfi, Vijay Mahadevan Iyer and Luca Moggi,
Photochem. Photobiol. Sci., 2009, 8, 1734
DOI: 10.1039/b9pp00037b
The thermally stable isomers 1a and 1b interconvert photochemically in acetonitrile. The photochemistry, wide spectral absorption range (240–700 nm) and high fatigue resistance make 1 suitable as a simple reusable chemical actinometer, especially for the visible (400–620 nm), where few other actinometers are available.
Cucurbituril complexes cross the cell membrane
Pedro Montes-Navajas, María González-Béjar, J. C. Scaiano and Hermenegildo García,
Photochem. Photobiol. Sci., 2009, 8, 1743
DOI: 10.1039/b9pp00041k
Host–guest complexes based on CB[7] and CB[8] with strong binding constants can enter tumoral cells as determined by fluorescence microscopy.
Pyrearinus termitilluminans larval click beetle luciferase: active site properties, structure and function relationships and comparison with other beetle luciferases
A. J. Silva Neto, V. Scorsato, F. G. C. Arnoldi and V. R. Viviani,
Photochem. Photobiol. Sci., 2009, 8, 1748
DOI: 10.1039/b9pp00053d
The green-emitting Pyrearinus termitilluminans larval click beetle luciferase was expressed, purified and characterized. Among beetle luciferases, it displays the most blue-shifted bioluminescence spectrum, as well as a high catalytic constant, thermal stability and sustained luminescence.
Additions and corrections for 2009
Photochem. Photobiol. Sci., 2009, 8, 1755
DOI: 10.1039/b923763c
Back matter
Photochem. Photobiol. Sci., 2009, 8, 1756
DOI: 10.1039/b923764j
Back cover
Photochem. Photobiol. Sci., 2009, 8, 1759
DOI: 10.1039/b923765h
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