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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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Contents list for Photochemical & Photobiological Sciences, issue 11, 2009
Front cover
Photochem. Photobiol. Sci., 2009, 8, 1489
DOI: 10.1039/b921534b
Contents and Highlights in Chemical Biology
Photochem. Photobiol. Sci., 2009, 8, 1491
DOI: 10.1039/b921535m
Perspectives
The sunny side of chemistry: green synthesis by solar light
Stefano Protti and Maurizio Fagnoni,
Photochem. Photobiol. Sci., 2009, 8, 1499
DOI: 10.1039/b909128a
Sunlight can be conveniently used to overcome the activation energy (here represented by Saqqara pyramid) in many chemical processes avoiding the use of high temperatures, catalysts, or other (aggressive) reagents. The mild conditions required fit well with the green chemistry postulates.
Time-resolved methods in biophysics. 10. Time-resolved FT-IR difference spectroscopy and the application to membrane proteins
Ionela Radu, Michael Schleeger, Carsten Bolwien and Joachim Heberle,
Photochem. Photobiol. Sci., 2009, 8, 1517
DOI: 10.1039/b9pp00050j
The implementation of time-resolved FT-IR spectroscopy to the structural study of membrane proteins and their catalytic mechanisms offers complementary information to other structurally sensitive methods like NMR spectroscopy and X-ray crystallography.
Communication
A micropatterned cell array with an integrated oxygen-sensitive fluorescent membrane
Kevin Montagne, Kikuo Komori, Fei Yang, Tetsu Tatsuma, Teruo Fujii and Yasuyuki Sakai,
Photochem. Photobiol. Sci., 2009, 8, 1529
DOI: 10.1039/b9pp00061e
A fluorescent polymer membrane based on fluorescence quenching by oxygen was made to monitor oxygen consumption by micropatterned cell spots.
Papers
A novel molecular conjugate for the simultaneous DNA oxidation and targeted delivery of nitric oxide triggered by light
Guido Bellia, Elisa Vittorino and Salvatore Sortino,
Photochem. Photobiol. Sci., 2009, 8, 1534
DOI: 10.1039/b9pp00067d
A novel molecular conjugate integrating a DNA intercalator, a nitric oxide photodonor and a viologen unit is able to simultaneously induce nucleobase oxidation via an electron transfer mechanism and generate nitric oxide near DNA upon the exclusive control of light stimuli.
The photosensitizing activity of lumazine using 2
-deoxyguanosine 5-monophosphate and HeLa cells as targets
M. Paula Denofrio, Sonja Hatz, Carolina Lorente, Franco M. Cabrerizo, Peter R. Ogilby and Andrés H. Thomas,
Photochem. Photobiol. Sci., 2009, 8, 1539
DOI: 10.1039/b9pp00020h
Recorded data unambiguously demonstrate that Lum can sensitize the photooxidative degradation of dGMP and, independently, that irradiation of intracellular Lum can result in cell death.
Experimental and quantum chemical study of photochemical properties of 4-hydroxyquinoline
Peter S. Sherin, Nina P. Gritsan and Yuri P. Tsentalovich,
Photochem. Photobiol. Sci., 2009, 8, 1550
DOI: 10.1039/b9pp00017h
The quantum yields, spectroscopic properties and reactions of the 4-hydroxyquinoline (4HQN) triplet state with tryptophan, tyrosine and ascorbate have been studied in aqueous solutions at different pH using laser flash photolysis technique. Assignment of transient absorption spectra was supported by quantum chemical calculations.
The role of p53 in the efficiency of photodynamic therapy with hypericin and subsequent long-term survival of colon cancer cells
Jaromír Mike
, Ján Koval', Rastislav Jend
elovský, Veronika Sa
ková, Ivana Uhrinová, Martin Kello, Lucia Kuliková and Peter Fedoroko,
Photochem. Photobiol. Sci., 2009, 8, 1558
DOI: 10.1039/b9pp00021f
The lack of p53 function did not affect cell proliferation or attenuate the initial phases of programmed cell death after photodynamic therapy with hypericin; however, it did suppress nuclear DNA fragmentation and led to higher clonogenic ability, especially in hypoxia.
Photopolymerization of conductive polymeric metal nanoparticles
Xichen Cai, Kelechi C. Anyaogu and Douglas C. Neckers,
Photochem. Photobiol. Sci., 2009, 8, 1568
DOI: 10.1039/b9pp00043g
Photopolymerization of 5-mercapto-2,2-bithiophene functionalized Cu, Ag, and Au nanoparticles was realized through UV irradiation. A particle size-dependent electron transfer is observed in Cu and Au, but not in Ag. The polymerized BTSM has a better conductivity.
Photophysical properties of N-alkylated azahelicene derivatives as DNA intercalators: counterion effects
Rosita Passeri, Gian Gaetano Aloisi, Fausto Elisei, Loredana Latterini, Tullio Caronna, Francesca Fontana and Isabella Natali Sora,
Photochem. Photobiol. Sci., 2009, 8, 1574
DOI: 10.1039/b9pp00015a
A combined UV-Vis spectroscopy and AFM approach establishes that the binding between DNA and N-alkylated azahelicene derivatives is affected by the counterion.
Unusually slow proton transfer dynamics of a 3-hydroxychromone dye in protic solvents
Ranjan Das, Andrey S. Klymchenko, Guy Duportail and Yves Mély,
Photochem. Photobiol. Sci., 2009, 8, 1583
DOI: 10.1039/b906710h
The rate of ESIPT reaction in a 3-hydroxychromone dye correlates with the H-bond donor acidicity of protic solvents, and thus modulates its dual emission.
Photochromic optical memory based on non-destructive IR read-out
Yong-Chul Jeong, Seon Ho Kim, Hyejin Ko, Kigook Song, Kwang-Hyun Ahn and Sung Ik Yang,
Photochem. Photobiol. Sci., 2009, 8, 1590
DOI: 10.1039/b906891k
The IR image of the polymer film containing DMTFO2 exhibited an excellent contrast ratio between open- and closed-ring isomers because of the high photoconversion yield as well as strong vibrational transition intensity.
Viscosity dependence of rubrene fluorescence quenching by organic radicals via energy transfer
Günter Grampp, Martin Justinek, Stephan Landgraf, Gonzalo Angulo and Nikita Lukzen,
Photochem. Photobiol. Sci., 2009, 8, 1595
DOI: 10.1039/b902433f
Rubrene fluorescence quenched by several radicals decays non-exponentially as the energy transfer kinetics are diffusion controlled.
Temperature influence on deactivation paths and tautomeric equilibrium of some photochromic Schiff bases studied by time-resolved and stationary spectroscopy
Katarzyna Filipczak, Jerzy Karolczak and Marcin Zió
ek,
Photochem. Photobiol. Sci., 2009, 8, 1603
DOI: 10.1039/b9pp00040b
The temperature influence on the tautomeric equilibrium between the enol and keto forms of the Schiff bases studied reveals the change in the order of ground state energy levels when going from methanol to trifluoroethanol.
Triple proton transfer of excited 7-hydroxyquinoline along a hydrogen-bonded water chain in ethers: secondary solvent effect on the reaction rate
Sun-Young Park, Bora Kim, Young-Shin Lee, Oh-Hoon Kwon and Du-Jeon Jang,
Photochem. Photobiol. Sci., 2009, 8, 1611
DOI: 10.1039/b9pp00026g
A large secondary solvent effect on the reaction rate has been experimentally observed in the excited-state tautomerization of a 7-hydroxyquinoline molecule complexed cyclically with two water molecules in diethyl ether and di-n-propyl ether.
Microwave discharge electrodeless lamps (MDEL)
Part IV. Novel self-ignition system incorporating metallic microwave condensing cones to activate MDELs in photochemical reactions
Satoshi Horikoshi, Akihiro Tsuchida, Hideki Sakai, Masahiko Abe, Susumu Sato and Nick Serpone,
Photochem. Photobiol. Sci., 2009, 8, 1618
DOI: 10.1039/b9pp00031c
A novel metallic condensing cone that concentrates microwave radiation has been developed to activate a microwave discharge electrodeless lamp (MDEL) and to aid in the self-ignition of the lamp on irradiation at low microwave power levels.
Back matter
Photochem. Photobiol. Sci., 2009, 8, 1626
DOI: 10.1039/b921536k
Back cover
Photochem. Photobiol. Sci., 2009, 8, 1627
DOI: 10.1039/b921537a
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