Abstract:
:Photo-Fries rearrangements of 4-dodecylphenyl phenylacetate have been investigated in polyethylene films with 0-71% crystallinity and in hexane over a range of temperatures. The results are compared to those reported previously from phenyl phenylacetate and 1-naphthyl tetradecanoate to assess the influence of a long alkyl chain on the in-cage motions of the intermediate singlet radical pairs. It is demonstrated that the reactivity and selectivity of intimate singlet radical pairs can be tuned by judicious placement of long-chain substituents and selection of a specific polyethylene type as the reaction matrix.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Luo C,Passin P,Weiss RGdoi
10.1562/2005-05-26-RA-546subject
Has Abstractpub_date
2006-01-01 00:00:00pages
163-70issue
1eissn
0031-8655issn
1751-1097pii
2005-05-26-RA-546journal_volume
82pub_type
杂志文章abstract::The Escherichia coli protein YcgF contains a photosensory flavin adenine dinucleotide (FAD)-binding BLUF domain covalently linked to an EAL domain, which is predicted to have cyclic-di-guanosine monophosphate (GMP) phosphodiesterase activity. We have cloned, overexpressed and purified this protein, which we refer to a...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/2004-06-16-RA-203
更新日期:2004-11-01 00:00:00
abstract::Comparative study of 13,15-[N-(2-hydroxyethyl)]cycloimide chlorin p6 (2), 13,15-(N-acetoxy)cycloimide chlorin p6 (3), 13,15-(N-hydroxy)cycloimide chlorin p6 methyl ester (4) and 13,15-(N-methoxy)cycloimide chlorin p6 methyl ester (5) together with the previously investigated 13,15-[N-(3-hydroxypropyl)]cycloimide chlor...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2004)079<0172:csoppo>2.0.co;2
更新日期:2004-02-01 00:00:00
abstract::Exposure of solutions containing both tryptophan and hydrogen peroxide to a pulsed ( approximately 180 fs) laser beam at 750 nm induces luminescence characteristic of 5-hydroxytryptophan. The results indicate that 3-photon excitation of tryptophan results in photoionization within the focal volume of the laser beam. T...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2008.00447.x
更新日期:2009-01-01 00:00:00
abstract::Aspects of different calibration procedures for erythemally weighing broadband radiometers are presented in this study. These instruments are common in projects dealing with ultraviolet radiation effects on humans. Many erythemally weighing broadband radiometers are still operated using a single calibration factor (cf...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2003)078<0603:SCFBSU>2.0.CO;2
更新日期:2003-12-01 00:00:00
abstract::Skin cancer studies depend on questionnaires to estimate exposure to ultraviolet light and subsequent risk but are limited by recall bias. We investigate the feasibility of developing a short checklist of categories comprising outdoor activities that can improve sun exposure questionnaires for use in epidemiologic stu...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2008.00393.x
更新日期:2009-01-01 00:00:00
abstract::Exploration of environmental dynamics using intrinsic biological probe tryptophan is very important; however, it suffers from various difficulties. An alternative probe, kynurenine (KN), has been found to be an efficient probe for the ultrafast dynamics in the biological environment (Goswami et al., [2010] J. Phys. Ch...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2011.01007.x
更新日期:2012-01-01 00:00:00
abstract::We report here the design and synthesis of porphyrin-metallocene dyads consisting of a metallocene [either ferrocene or mixed sandwich η(5)-[C5H4(COOH)]Co(η(4)-C4Ph4) connected via an ester linkage at meso phenyl position of either free-base or zinc porphyrin. All these dyad systems were characterized by various spect...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12372
更新日期:2015-01-01 00:00:00
abstract::Seafarers working on decks of vessels at low latitudes are exposed to extremely high solar UV radiation. Their risk of developing skin cancer may be enhanced. Solar erythemal UV irradiance and exposure were measured for the first time on merchant vessels going along typical international routes at low latitudes. The m...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12144
更新日期:2013-11-01 00:00:00
abstract::Pyocyanin (PyO-) (1-hydroxy-5-methylphenazine) is a cytotoxic compound secreted by Pseudomonas aeruginosa, an omnipresent bacterium and a human pathogen. We report that visible light illumination in the presence of rose bengal, or riboflavin, in aerated solutions (pH 7.0-7.2) induces irreversible loss of the pigment's...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/2005-07-29-RA-626
更新日期:2006-03-01 00:00:00
abstract::During the past several years there has been debate about the origins of nonexponential intensity decays of intrinsic tryptophan (trp) fluorescence of proteins, especially for single tryptophan proteins (STP). In this review we summarize the data from diverse sources suggesting that time-dependent spectral relaxation ...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章,评审
doi:10.1562/0031-8655(2000)072<0421:OSRIP>2.0.CO;2
更新日期:2000-10-01 00:00:00
abstract::Neutrophils stimulated with formyl-methionyl-leucyl-phenylalanine (fMLP) or leukotriene B4 (LTB4) generated kinetically distinctive luminol augmented chemiluminescence (LCL). Inhibitors of .O2- [superoxide-dismutase (SOD) or tiron], H2O2 (catalase), myeloperoxidase, MPO, (NaN3), HOCl (taurine) and .OH (mannitol) hampe...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1989.tb04099.x
更新日期:1989-02-01 00:00:00
abstract::The infrared spectrum of monomeric unsubstituted coumarin (C9H6O2; 2H-1-benzopyran-2-one), isolated in solid argon at 10 K is presented and assigned. The UV-induced (lambda>200 nm) unimolecular photochemistry of the matrix-isolated compound was studied experimentally. Three main photoreactions were observed: (a) decar...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2007.00152.x
更新日期:2007-09-01 00:00:00
abstract::We investigated the hypothesis that the strength of the activation of the intra-S DNA damage checkpoint varies within the S phase. Synchronized diploid human fibroblasts were exposed to either 0 or 2.5 J m(-2) UVC in early, mid- and late-S phase. The endpoints measured were the following: (1) radio-resistant DNA synth...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12361
更新日期:2015-01-01 00:00:00
abstract::An ongoing study in our laboratories is to examine the relationship of DNA repair defects to human cancer. Our underlying hypothesis has been that human tumors may arise that lack interesting DNA repair pathways if these pathways are important in preventing cancer. In this study, we found that the UV-irradiated adenov...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:
更新日期:1999-08-01 00:00:00
abstract::Photosensitizers (PS) are compounds that can generate reactive oxygen species under irradiation of appropriate light and are widely used in photodynamic therapy (PDT). Currently, topical PDT is an effective treatment for several skin diseases, including bacterial infections, fungal mycoses and psoriasis. In addition, ...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.13335
更新日期:2020-09-23 00:00:00
abstract::Iranian firefly larvae, Lampyris turkestanicus collected from north of Iran and their luciferin were analyzed by HPLC, TLC, MS and spectroscopic Fourier transform ([FT]-IR, FT-NMR, UV and fluorescence) methods. The results showed that luciferin in L turkestanicus lanterns was the same as in the American firefly, Photi...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1996.tb01841.x
更新日期:1996-11-01 00:00:00
abstract::alpha-Crystallin, a major protein of the mammalian lens, plays a vital role in maintaining the structural stability and transparency of the lens. It performs this function through chaperone-like activity; it has recently been reported that heating alpha-crystallin enhances this ability. The present studies, using both...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2000)071<0470:haceot>2.0.co;2
更新日期:2000-04-01 00:00:00
abstract::Absorbance changes were monitored from 250 to 650 nm during the first microsecond after photolysis of detergent suspensions of bovine rhodopsin at 20 degrees C. Global analysis of the resulting data produced difference spectra for bathorhodopsin, BSI and lumirhodopsin which give the change in absorbance of the aromati...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1997.tb03218.x
更新日期:1997-12-01 00:00:00
abstract::Although ultraviolet-B (UV-B) radiation is potentially harmful, it is an important component of terrestrial radiation to which plants have been exposed since invading land. Since then, plants have evolved mechanisms to avoid and repair UV radiation damage; therefore, it is not surprising that photomorphogenic response...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章,评审
doi:10.1562/0031-8655(2003)078<0529:hduprc>2.0.co;2
更新日期:2003-12-01 00:00:00
abstract::Consecutive spectral analyses of ultraweak photon emission from sweet potato showing a defense response were conducted to observe the process of physiological transition. The spectrum showed a drastic transition from 2 to 10 h after inoculation with Fusarium oxysporum, during which the emission intensity increased slo...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2002)075<0322:ssoupe>2.0.co;2
更新日期:2002-03-01 00:00:00
abstract::Solar ultraviolet B (UVB) radiation has been shown to induce inflammation, DNA damage, p53 mutations and alterations in signaling pathways eventually leading to skin cancer. In this study, we investigated whether fisetin reduces inflammatory responses and modulates PI3K/AKT/NFκB cell survival signaling pathways in UVB...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12337
更新日期:2015-01-01 00:00:00
abstract::Vitamin A palmitate has been used in cosmetics; however, studies report that this substance shows photoreactivity that can lead to loss of safety and efficacy. On the other hand, photostabilizers have been used to increase sunscreen photostability and consequently their safety and effectiveness. Thus, this study aimed...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2010.00806.x
更新日期:2010-11-01 00:00:00
abstract::There is a need to improve the selectivity of photodynamic therapy and for better targeting of tumor cells within specific tumor compartments. Selective in vitro phototoxicity of a human bladder carcinoma cell line 647V has been achieved by targeting sulfonated aluminum phthalocyanines (AlSPc) with monoclonal antibodi...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1994.tb05139.x
更新日期:1994-11-01 00:00:00
abstract::Antisense oligodeoxynucleotides directed against a 24-mer RNA derived from the long terminal repeat (LTR) region of HIV were linked to proto- and methylpyrroporphyrin and their zinc derivatives. The oligonucleotide-porphyrin conjugates were tested for their ability to induce photodamage on the target RNA. Upon hybridi...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1994.tb05110.x
更新日期:1994-10-01 00:00:00
abstract::The sequence specificity of photobinding to DNA of two tetrahydrobenzopsoralen derivatives has been investigated by testing the photoreactivity toward a number of self-complementary oligonucleotides. The thermodynamic constant for noncovalent binding to each DNA sequence was evaluated. The extent of photoreactivity wa...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1995.tb03948.x
更新日期:1995-02-01 00:00:00
abstract::Although strong fluorescence makes the R-phycoerythrin (R-PE) proteins increasingly useful in biological and clinical assays, they are subject to nonlinear effects including transitions to collective dark states and photodegradation, which complicate quantitative applications. We report measurements of R-PE fluorescen...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/2005-05-26-RA-544
更新日期:2006-05-01 00:00:00
abstract::Generating accurate population-specific public health messages regarding sun protection requires knowledge about seasonal variation in sun exposure in different environments. To address this issue for a subtropical area of Australia, we used polysulphone badges to measure UVR for the township of Nambour (26 degrees la...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2009.00686.x
更新日期:2010-03-01 00:00:00
abstract::The aim of this investigation is the evaluation of DNA interaction of with tetraruthenated porphyrin (TRP) and of DNA damage in the presence of light. Direct-fluorescence and electronic absorption measurements after incubation of DNA with TRP indicate strong binding between pBR322 DNA or calf thymus DNA with the modif...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1996.tb03024.x
更新日期:1996-03-01 00:00:00
abstract::The cellular uptake of Photofrin II (PII) was studied using fluorescence imaging and chemical extraction. The influence of serum and low density lipoproteins (LDL) was examined under a variety of experimental conditions employing cultured human cells of different origins as well as a subcutaneously SMT-F tumor implant...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1990.tb01702.x
更新日期:1990-02-01 00:00:00
abstract::Cypridina luciferase (Cluc), a secreted luminescent protein identified from Cypridina noctiluca, has two N-glycosylation sites. In this study, we evaluated the effects of N-glycosylation on Cluc properties by creating site-directed mutagenic modifications at the consensus sequence for N-glycosylation (Asn-X-Ser/Thr). ...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12847
更新日期:2018-03-01 00:00:00