abstract：:The photodegradation of the S(+)- and R(-)-ketoprofen (KP) enantiomers in the bovine serum albumin matrix was studied by steady-state photolysis with the use of lambda(irr) > 320 nm and transient absorption spectroscopy with lambda(exc) = 355 nm, at 1/1 and 2/1 KP/BSA molar ratios. R(-)-KP was found to be more labile ...

journal_title：Photochemistry and photobiology

authors： Monti S,Manet I,Manoli F,Morrone R,Nicolosi G,Sortino S

更新日期：2006-01-01 00:00:00

abstract：:The thermodynamic parameters for the formation of the free radicals upon electron transfer quenching of the flavin triplet state (3FMN) by tryptophan and tyrosine, Delta(FR)H and Delta(FR)V, were obtained in aqueous solution by the application of laser-induced optoacoustic spectroscopy at various temperatures. The Del...

journal_title：Photochemistry and photobiology

authors： Crovetto L,Martínez-Junza V,Braslavsky SE

更新日期：2006-01-01 00:00:00

abstract：:Photodynamic therapy (PDT) is frequently accompanied by induction of systemic immunosuppression. Photochemical mechanisms underlying this effect are not completely understood. Here, we demonstrate the immunosuppressive activity of photooxidation products of protoporphyrin IX dimethyl ester (PPIX) in a murine model of ...

journal_title：Photochemistry and photobiology

authors： Kyagova AA,Mansurova GV,Kozir LA,Ponomarev GV,Pavlov VY,Konstantinov IO,Potapenko AY

更新日期：2005-11-01 00:00:00

abstract：:Immunosuppressive doses of solar-simulated UV radiation activate lymph node B cells that can suppress primary immunity by inhibiting the function of dendritic cells. The aim of this study was to determine the waveband responsible for activation of these suppressor B cells. We exposed C57BL/6 mice to various doses of e...

journal_title：Photochemistry and photobiology

authors： Byrne SN,Ahmed J,Halliday GM

更新日期：2005-11-01 00:00:00

abstract：:In the present study, photodynamic activity of a novel photosensitizer (PS), Chlorin e(6)-2.5 N-methyl-d-glucamine (BLC 1010), was evaluated using the chorioallantoic membrane (CAM) as an in vivo model. After intravenous (i.v.) injection of BLC 1010 into the CAM vasculature, the applicability of this drug for photodyn...

journal_title：Photochemistry and photobiology

authors： Pegaz B,Debefve E,Borle F,Ballini JP,Wagnières G,Spaniol S,Albrecht V,Scheglmann D,Nifantiev NE,van den Bergh H,Konan YN

更新日期：2005-11-01 00:00:00

abstract：:Singlet oxygen ((1)O(2)) is the most important cytotoxic agent in photodynamic therapy (PDT). The feasibility of using a chemiluminescence (CL) probe, 3,7-dihydro-6-[4-(2-(N'-(5-fluoresceinyl)thioureido)ethoxy)phenyl]-2-methylimidazo{1,2-a}pyrazin-3-one sodium salt (fluoresceinyl Cypridina luciferin analog, FCLA), to ...

journal_title：Photochemistry and photobiology

authors： Qin Y,Xing D,Luo S,Zhou J,Zhong X,Chen Q

更新日期：2005-11-01 00:00:00

abstract：:Vitamin D production in human skin occurs only when incident UV radiation exceeds a certain threshold. From simulations of UV irradiances worldwide and throughout the year, we have studied the dependency of the extent and duration of cutaneous vitamin D production in terms of latitude, time, total ozone, clouds, aeros...

journal_title：Photochemistry and photobiology

authors： Engelsen O,Brustad M,Aksnes L,Lund E

更新日期：2005-11-01 00:00:00

abstract：:This paper reviews briefly the evidence for an association between various measures of UV radiation (UVR) exposure and the development of cancer. Issues such as data quality, study design, measurement variation, comparability of studies, and quantification of UV exposure in relation to skin cancer are discussed. A ran...

journal_title：Photochemistry and photobiology

authors： Berwick M,Kesler D

更新日期：2005-11-01 00:00:00

abstract：:We previously reported that Shewanella oneidensis MR-1 is extremely sensitive to natural solar radiation (NSR). Here we analyzed the global transcriptional profile of MR-1 during a 1-h recovering period after exposure to ambient solar light at a dose that yields about 20% survival rate on a Luria-Bertani (LB) plate. W...

journal_title：Photochemistry and photobiology

authors： Qiu X,Tiedje JM,Sundin GW

更新日期：2005-11-01 00:00:00

abstract：:Pterins are heterocyclic compounds with important biological functions, and most of them may exist in two acid-base forms in the pH range between 3 and 13 in aqueous solution. In this work, the photophysical properties of acid and basic forms of six compounds of the pterin family (6-hydroxymethylpterin [HPT], 6-methyl...

journal_title：Photochemistry and photobiology

authors： Cabrerizo FM,Petroselli G,Lorente C,Capparelli AL,Thomas AH,Braun AM,Oliveros E

更新日期：2005-09-01 00:00:00

abstract：:Novel water-soluble polymeric photosensitizers (SPO) based on starch and containing porphyrin chromophores were synthesized and studied. The polymers were soluble in water and in dimethyl sulfoxide. Photophysical studies and solubilization of molecular probes proved the formation of hydrophobic, rigid microdomains in ...

journal_title：Photochemistry and photobiology

authors： Nowakowska M,Sterzel M,Zapotoczny S

更新日期：2005-09-01 00:00:00

abstract：:We examined the influence of solar ultraviolet-B radiation (UV-B; 280-320 nm) on the growth, biomass production and phenylpropanoid concentrations of Deschampsia antarctica during the springtime ozone depletion season at Palmer Station, along the Antarctic Peninsula. Treatments involved placing filters on frames over ...

journal_title：Photochemistry and photobiology

authors： Ruhland CT,Xiong FS,Clark WD,Day TA

更新日期：2005-09-01 00:00:00

abstract：:Plant responses to light spectral quality can be exploited to deliver a range of agronomically desirable end points in protected crops. This can be achieved using plastics with specific spectral properties as crop covers. We have studied the responses of a range of crops to plastics that have either (a) increased tran...

journal_title：Photochemistry and photobiology

authors： Paul ND,Jacobson RJ,Taylor A,Wargent JJ,Moore JP

更新日期：2005-09-01 00:00:00

abstract：:The interaction with amino acids of the excited states of the N-oxide resazurin and its deoxygenation product resorufin, has been studied in aqueous solution at pH 7.5. Steady-state and time-resolved studies show that the fluorescence is quenched by amino acids. Complexation of the dyes in the ground state with aromat...

journal_title：Photochemistry and photobiology

authors： Villegas ML,Bertolotti SG,Previtali CM,Encinas MV

更新日期：2005-07-01 00:00:00

abstract：:Topical photodynamic therapy is used for a variety of malignant and pre-malignant skin disorders, including Bowen's Disease and Superficial Basal Cell Carcinoma. A haem precursor, typically 5-aminolevulinic acid (ALA), acting as a prodrug, is absorbed and converted by the haem biosynthetic pathway to photoactive proto...

journal_title：Photochemistry and photobiology

authors： Donnelly RF,McCarron PA,Woolfson AD

更新日期：2005-07-01 00:00:00

abstract：:Carp (Cyprinus carpio) were repeatedly exposed to 0, 60, 120 and 240 mJ/cm2 ultraviolet B (UVB) radiation three times in 1 week (short-term exposure) or 12 times in 4 weeks (long-term exposure). The effect of UVB on the functioning of the carp immune system was studied on day 2 after the final irradiation. After short...

journal_title：Photochemistry and photobiology

authors： Markkula SE,Salo HM,Immonen AK,Jokinen EI

更新日期：2005-05-01 00:00:00

abstract：:Synovial sarcoma (SS) is one of common malignant soft-tissue tumors and is encountered most commonly in children and young adults. It frequently involves or invades major neurovascular structures and bones, and its local recurrence rate after simple resection has been reported to be as high as up to 80%. Because major...

journal_title：Photochemistry and photobiology

authors： Kusuzaki K,Murata H,Matsubara T,Miyazaki S,Shintani K,Seto M,Matsumine A,Hosoi H,Sugimoto T,Uchida A

更新日期：2005-05-01 00:00:00

abstract：:Two-photon laser scanning microscopy (TPLSM) of endogenous reduced nicotinamide adenine dinucleotide (NAD(P)H) provides important information regarding the cellular metabolic state. When imaging the punctate mitochondrial fluorescence originating from NAD(P)H in a rat basophilic leukemia (RBL) cell at low laser powers...

journal_title：Photochemistry and photobiology

authors： Nichols MG,Barth EE,Nichols JA

更新日期：2005-03-01 00:00:00

abstract：:Molecular beacons (MB) are becoming more common as sequence-selective detectors of nucleic acids. Although they can easily detect single-base mismatches, they have never been used to directly detect DNA or RNA damage. To measure the degree of ultraviolet (UV) light damage in oligonucleotides, we report a novel MB appr...

journal_title：Photochemistry and photobiology

authors： Yarasi S,McConachie C,Loppnow GR

更新日期：2005-03-01 00:00:00

abstract：:A novel continuous-flow photocatalytic reactor was designed to decompose toluene by using porous nickel sheets that were coated with a Fe-doped TiO2 catalyst. While locating the UV lamp at the central axis, the catalyst sheets were located along the inner wall and positioned vertically with an equal space of 50 mm alo...

journal_title：Photochemistry and photobiology

authors： Dezhi S,Sheng C,Chung JS,Xiaodong D,Zhibin Z

更新日期：2005-03-01 00:00:00

abstract：:Excessive exposure of solar ultraviolet (UV) radiation, particularly its UV-B component, to humans causes many adverse effects that include erythema, hyperplasia, hyperpigmentation, immunosuppression, photoaging and skin cancer. In recent years, there is increasing use of botanical agents in skin care products. Pomegr...

journal_title：Photochemistry and photobiology

authors： Afaq F,Malik A,Syed D,Maes D,Matsui MS,Mukhtar H

更新日期：2005-01-01 00:00:00

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

authors： Rajagopal S,Key JM,Purcell EB,Boerema DJ,Moffat K

更新日期：2004-11-01 00:00:00

abstract：:Low-power lasers are commonly used in human medicine for treatment of various pathological conditions, but mechanisms of their healing effects are still poorly understood. The results of this study provide information related to these effects at the cellular level. Two different protozoan species, Euglena gracilis and...

journal_title：Photochemistry and photobiology

authors： Koutna M,Janisch R,Unucka M,Svobodnik A,Mornstein V

更新日期：2004-11-01 00:00:00

abstract：:The effect of netropsin on the oxidative reactions of duplex DNA was examined. One-electron oxidation of DNA creates a radical cation that migrates through duplex DNA and reacts primarily at GG steps. Netropsin is a dication that specifically binds primarily by hydrogen bonding in the minor groove at sites that have f...

journal_title：Photochemistry and photobiology

authors： Roberts LW,Schuster GB

更新日期：2004-11-01 00:00:00

abstract：:The ciliate Stentor coeruleus exhibits photodispersal, that is, these cells swim away from light sources and collect in dimly lighted areas. We imaged and reconstructed the tracks of 48 Stentor to determine which swimming behaviors produced their photodispersal. We observed that their photodispersal is not due to a ch...

journal_title：Photochemistry and photobiology

authors： Menzies E,Das N,Wood DC

更新日期：2004-11-01 00:00:00

abstract：:Intermolecular interactions of human serum proteins with a hydrophilic nonmetalloporphyrin, 13,17-bis(1-carboxypropionyl)carbomoylethyl-8-ethenyl-2-hydroxy-3-hydroxyiminoethylidene-2,7,12,18-tetramethylporphyrin sodium salt (ATX-S10 (Na)), or a hydrophilic gallium-metalloporphyrin, diethylenetriamine pentaacetic acid ...

journal_title：Photochemistry and photobiology

authors： Yamaguchi M,Tanabe S,Nakajima S,Takemura T,Ogita K,Kuwayama H,Sakata I,Miyaki S,Suzuki K,Namiki H,Uzuka Y,Sarashina T

更新日期：2004-09-01 00:00:00

abstract：:We study the fluorescence lifetime of the well-known 1-pyrene butyric acid (PBA) to assess oxygen concentrations in living cells. The behavior of the probe is first studied in water, ethanol, protein solution and liposome suspension. The Stern-Volmer plot of these solutions is linear, and the bimolecular reaction rate...

journal_title：Photochemistry and photobiology

authors： Ribou AC,Vigo J,Salmon JM

更新日期：2004-09-01 00:00:00

abstract：:On direct photoexcitation, subpicosecond time-resolved absorption spectroscopy revealed that the 1B(u)-type singlet excited state of all-trans-lycopene in chloroform was about seven times more efficient than all-trans-beta-carotene in generating the radical cation. The time constant of radical cation generation from t...

journal_title：Photochemistry and photobiology

authors： Han RM,Wu YS,Feng J,Ai XC,Zhang JP,Skibsted LH

更新日期：2004-09-01 00:00:00

abstract：:Stratospheric ozone depletion has caused an increase in the amount of ultraviolet-B (UV-B) radiation reaching the earth's surface. Numerous investigations have demonstrated that the effect of UV-B enhancements on plants includes reduction in grain yield, alteration in species competition, susceptibility to disease and...

journal_title：Photochemistry and photobiology

authors： Gao W,Zheng Y,Slusser JR,Heisler GM,Grant RH,Xu J,He D

更新日期：2004-07-01 00:00:00

abstract：:Effects of solvent, pH and hydrogen bonding with N-methylimidazole (MIm) on the photophysical properties of 1-hydroxyfluorenone (1HOF) have been studied. Fluorescence lifetime, fluorescence quantum yield and triplet yield measurements demonstrated that intersystem crossing was the dominant process in apolar media and ...

journal_title：Photochemistry and photobiology

authors： Sebok-Nagy K,Biczók L,Morimoto A,Shimada T,Inoue H

更新日期：2004-07-01 00:00:00

abstract：:Antifungal activity is positively correlated to furanocoumarin content in extracts of the traditional phytomedicine northern prickly ash (Zanthoxylum americanum Mill. [Rutaceae]). The specificity of these furanocoumarins in inhibiting replication of DNA was investigated with reference to significant base composition d...

journal_title：Photochemistry and photobiology

authors： Smith ML,Gregory P,Bafi-Yeboa NF,Arnason JT

更新日期：2004-06-01 00:00:00

abstract：:Current conditions of 2-11 kJ m(-2) day(-1) of UV-B radiation and temperatures of >30 degrees C during flowering in cotton cultivated regions are projected to increase in the future. A controlled environment study was conducted in sunlit growth chambers to determine the effects of UV-B radiation and temperature on phy...

journal_title：Photochemistry and photobiology

authors： Reddy KR,Kakani VG,Zhao D,Koti S,Gao W

更新日期：2004-05-01 00:00:00

abstract：:We studied the spectral characteristics of the larvae of three sympatric Belgian species of fireflies, Lampyris noctiluca, Phosphaenus hemipterus and Lamprohiza splendidula. An in vivo spectral study was performed to compare bioluminescence spectra. The emission spectrum of a laboratory reared female L. noctiluca was ...

journal_title：Photochemistry and photobiology

authors： De Cock R

更新日期：2004-04-01 00:00:00

abstract：:Recent developments in optical technologies have the potential to improve the speed and accuracy of screening and diagnosis of curable precancerous lesions and early cancer, thereby decreasing the costs of detection and management of epithelial malignancies. The development of molecular-specific contrast agents for ma...

journal_title：Photochemistry and photobiology

authors： Hsu ER,Anslyn EV,Dharmawardhane S,Alizadeh-Naderi R,Aaron JS,Sokolov KV,El-Naggar AK,Gillenwater AM,Richards-Kortum RR

更新日期：2004-03-01 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

authors： Feofanov A,Sharonov G,Grichine A,Karmakova T,Pljutinskaya A,Lebedeva V,Ruziyev R,Yakubovskaya R,Mironov A,Refregier M,Maurizot JC,Vigny P

更新日期：2004-02-01 00:00:00

abstract：:Synthesis of extracellular matrix (ECM) proteins and their degradation by matrix metalloproteinases (MMP) are part of the dermal remodeling resulting from chronic exposure of skin to ultraviolet radiation (UVR). We have compared two alternative mechanisms for these responses, namely, a direct mechanism in which UV-B o...

journal_title：Photochemistry and photobiology

authors： Kossodo S,Wong WR,Simon G,Kochevar IE

更新日期：2004-01-01 00:00:00

abstract：:Polarized steady-state fluorescence and fluorescence excitation spectra as well as time-resolved fluorescence for B-phycoerythrin (B-PE) from red algae, Porphyridium cruentum, embedded in polyvinyl stretched films were measured. The lifetimes of polarized fluorescence were analyzed using exponential components and fra...

journal_title：Photochemistry and photobiology

authors： Frackowiak D,Ptak A,Gryczynski Z,Gryczynski I,Targowski P,Zelent B

更新日期：2004-01-01 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

authors： Oppenrieder A,Hoeppe P,Koepke P,Reuder J,Schween J,Schreder J

更新日期：2003-12-01 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

authors： Gitz DC,Liu-Gitz L

更新日期：2003-12-01 00:00:00

abstract：:Photodetection (PD) and photodynamic therapy (PDT) with 5-aminolevulinic acid (ALA)-induced protoporphyrin IX (PPIX) accumulation are approaches to detect and treat dysplasia and early cancer in the gastrointestinal tract and in the urinary bladder. Because ALA-induced PPIX production is limited, we synthesized ALA es...

journal_title：Photochemistry and photobiology

authors： Brunner H,Hausmann F,Knuechel R

更新日期：2003-11-01 00:00:00