New triruthenium clusters as photoinduced DNA-binding and cleaving agents.

abstract：:Laser flash photolysis was used to determine the kinetics of electron transfer between membrane-bound triplet chlorophyll (3C), cytochrome c (cyt c) located in the external water phase, and vesicle-reconstituted cytochrome c oxidase (CCO). 2,5-Di-t-butyl benzoquinone (2,5 TBQ) was used as an electron transfer mediator...

journal_title：Photochemistry and photobiology

authors： Chamupathi VG,Moezzi DM,Tollin G

更新日期：1990-10-01 00:00:00

abstract：:Vacuum UV (VUV) process is an incipient advanced oxidation process, which can be used for water treatment. This process relies on the formation of hydroxyl radicals through the VUV-induced photolysis of water. In particular, the use of ozone-generating mercury vapor lamps, which emit 10% of the radiation at 185 nm and...

journal_title：Photochemistry and photobiology

authors： Duca C,Imoberdorf G,Mohseni M

更新日期：2014-01-01 00:00:00

abstract：:Previous studies have reported that 450 nm blue light emitting diode (BLED) induces apoptosis through a mitochondria-mediated pathway in cancer cells and reduces the early stage tumor growth. This study was performed to determine the effects of BLED-irradiated cell metabolites on cell injury. Our results showed that c...

journal_title：Photochemistry and photobiology

authors： Oh PS,Kim EM,Kim M,Kim IS,Han YH,Lim S,Sohn MH,Ko MH,Jeong HJ

更新日期：2018-05-01 00:00:00

abstract：:Near-infrared spectroscopy has been used to quantify the composition of healthy female breast tissue in vivo. By collecting transillumination spectra in the wavelength range 680-1100 nm at 7-9 positions on the breasts of five female volunteers, an attempt was made to quantify the intra- and intersubject variability of...

journal_title：Photochemistry and photobiology

authors： Quaresima V,Matcher SJ,Ferrari M

更新日期：1998-01-01 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：:The photosolvolysis of several biphenyl methanols (Ph-PhCH[Ph]OH) substituted with hydroxy or methoxy groups on the benzene ring not containing the -CH(Ph)OH moiety has been studied in aqueous solution. This work is a continuation of our studies of photosolvolysis of hydroxy-substituted arylmethanols that generate qui...

journal_title：Photochemistry and photobiology

authors： Xu M,Lukeman M,Wan P

更新日期：2006-01-01 00:00:00

abstract：:We previously reported that the efficacy of photodynamic therapy (PDT) in cell culture was enhanced by ursodeoxycholic acid (UDCA), a nontoxic bile acid. In this study, we examined the ability of UDCA to promote tumor control by PDT in the mouse, using the radiation-induced fibrosarcoma tumor and the photosensitizing ...

journal_title：Photochemistry and photobiology

authors： Garbo GM,Vicente MG,Fingar V,Kessel D

更新日期：2003-10-01 00:00:00

abstract：:The azide ion is a strong physical quencher of singlet molecular oxygen (1O2) and is frequently employed to show involvement of 1O2 in oxidation processes. Rate constants (k(q)) for the quenching of 1O2 by azide are routinely used as standards to calculate k(q) values for quenching by other substrates. We have measure...

journal_title：Photochemistry and photobiology

authors： Li MY,Cline CS,Koker EB,Carmichael HH,Chignell CF,Bilski P

更新日期：2001-12-01 00:00:00

abstract：:Mitochondria have been implicated as a primary subcellular site of porphyrin localization and photodestruction. However, other organelles including the cell membrane, lysosomes and nucleus have been shown to be damaged by hematoporphyrin derivative (HpD) photosensitized destruction as well. In this study we attempted ...

journal_title：Photochemistry and photobiology

authors： Shulok JR,Wade MH,Lin CW

更新日期：1990-04-01 00:00:00

abstract：:The effect of pretreatment with vitamin E on cytotoxicity, DNA single strand breaks, and chromosomal aberrations as well as on mutation induced by ultraviolet-B light (UV-B) was investigated in Chinese hamster V-79 cells. Cellular pretreatment with non-toxic levels of 25 microM alpha-tocopherol succinate (vitamin E) f...

journal_title：Photochemistry and photobiology

authors： Sugiyama M,Tsuzuki K,Matsumoto K,Ogura R

更新日期：1992-07-01 00:00:00

abstract：:We analyzed the photoinactivation of the membrane functions of bacteria and erythrocytes induced by xanthene dyes. The dyes tested were rose bengal, phloxine B, erythrosine B and eosin B. These dyes induced the leakage of K(+) from Staphylococcus aureus cells within minutes of photoirradiation, in the order of rose be...

journal_title：Photochemistry and photobiology

authors： Kato H,Komagoe K,Nakanishi Y,Inoue T,Katsu T

更新日期：2012-03-01 00:00:00

abstract：:In horticultural crops, the use of screens to protect plants is the usual strategy in the Mediterranean area. Screen manufacturers offer a range of netting that vary in their UV-absorbing properties. We compared the photoeffects of seven different screens. Sweet pepper trials were conducted at the Gilat Research Cente...

journal_title：Photochemistry and photobiology

authors： Legarrea S,Karnieli A,Fereres A,Weintraub PG

更新日期：2010-03-01 00:00:00

abstract：:A diffusible multitherapy resistance factor (MTRF) is produced by Cloudman S91 melanoma cells in vitro. The MTRF decreases sensitivity of the target cell line, S91/amel, to gamma-irradiation, UVC (200-280 nm) and mitomycin C (MMC). In the present study, we demonstrate that MTRF also increases the survival of S91/amel ...

journal_title：Photochemistry and photobiology

authors： Hill HZ,Hill GJ,Cieszka K,Azure M,Chowdhary I,Sayre RM

更新日期：1995-05-01 00:00:00

abstract：:International patterns suggest germ cell testicular cancer (GCTC) incidence may be lower in lower latitudes. To investigate this possibility, we examined GCTC incidence by latitude (population centroid in 2000) for men ≥15 years within two reasonably homogeneous countries, the United States and Australia. In the Unite...

journal_title：Photochemistry and photobiology

authors： Biggar RJ,Baade PD,Sun J,Brandon LE,Kimlin M

更新日期：2016-09-01 00:00:00

abstract：:The energy and oscillator strength of electronic transitions of chlorophyll (Chl)-amino acid complexes were calculated by using molecular orbital methods. The energies varied widely with coordinated amino acids and the difference between the maximum and minimum energy was about 830 cm-1. This energy difference was com...

journal_title：Photochemistry and photobiology

authors： Nishigaki A,Ohshima S,Nakayama K,Okada M,Nagashima U

更新日期：2001-03-01 00:00:00

abstract：:A spectral resolution procedure was used to resolve the absorption, excitation and emission spectra of the fluorescein monoanion in a number of solvent-water mixtures. This permitted an analysis of the effect of the solvent environment on the spectral properties of the monoanion and on the lactone/monoanion/dianion tr...

journal_title：Photochemistry and photobiology

authors： Klonis N,Sawyer WH

更新日期：2000-08-01 00:00:00

abstract：:During the photoreaction cycle of photoactive yellow protein (PYP), a physiologically active intermediate (PYP(M)) is formed as a consequence of global protein conformational change. Previous studies have demonstrated that the photocycle of PYP is regulated by the N-terminal loop region, which is located across the ce...

journal_title：Photochemistry and photobiology

authors： Harigai M,Kataoka M,Imamoto Y

更新日期：2008-07-01 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：:Types of photoreceptor cells in the retinas of 36 species of vertebrates (5 classes, 14 orders) were investigated immunocytochemically with monoclonal antibodies against chicken iodopsin (Io-mAb) and antiserum against bovine rhodopsin (Rh-As). In mammals, Rh-As labeled the outer segments of some photoreceptor cells in...

journal_title：Photochemistry and photobiology

authors： Kawata A,Oishi T,Fukada Y,Shichida Y,Yoshizawa T

更新日期：1992-12-01 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

authors： Gyllenhammar H

更新日期：1989-02-01 00:00:00

abstract：:The phototransduction cascade is perhaps the best understood model system for G protein-coupled receptor (GPCR) signaling. Phototransduction links the absorption of a single photon of light to a decrease in cytosolic cGMP. Depletion of the cGMP pool induces closure of cGMP-gated cation channels resulting in the hyperp...

journal_title：Photochemistry and photobiology

authors： Lodowski DT,Angel TE,Palczewski K

更新日期：2009-03-01 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：:We calculated the integrated UVB and plant damage irradiances for Argentina, a country in the Southern Hemisphere spread over a large latitudinal range. The irradiances were calculated for clear sky days using the Madronich code for the average conditions of the months corresponding to the summer and winter solstices ...

journal_title：Photochemistry and photobiology

authors： Micheletti MI,Piacentini RD

更新日期：2002-09-01 00:00:00

abstract：:Oculocutaneous albinism (OCA) is a genetically inherited autosomal recessive condition. Individuals with OCA lack melanin and therefore are susceptible to the harmful effects of solar ultraviolet radiation, including extreme sun sensitivity, photophobia and skin cancer. OCA is a grave public health issue in sub-Sahara...

journal_title：Photochemistry and photobiology

authors： Wright CY,Norval M,Hertle RW

更新日期：2015-01-01 00:00:00

abstract：:The photoprocesses of berberine, palmatine, coralyne, sanguinarine, flavopereirine and ellipticine were studied in several solvents. The quantum yields Φ(Δ) of singlet molecular oxygen formation of berberine, palmatine and sanguinarine are moderate in dichloromethane (0.2-0.6) and much smaller in acetonitrile or trifl...

journal_title：Photochemistry and photobiology

authors： Görner H,Miskolczy Z,Megyesi M,Biczók L

更新日期：2011-03-01 00:00:00

abstract：:The reactions of polyuridylic acid [poly(U)] with Ru(bpy)3(3+) [Ru(III)] and SO4.-, following UV and visible light irradiation of Ru(bpy)3(2+) [Ru(II)] in the presence of S2O8(2-), were studied in an argon-saturated aqueous solution using time-resolved absorption and conductivity methods. The kinetics of the Ru(III) c...

journal_title：Photochemistry and photobiology

authors： Tossi AB,Görner H,Schulte-Frohlinde D

更新日期：1989-11-01 00:00:00

abstract：:Light-dark cycles are considered important cues to entrain biological clocks. A feedback loop of clock gene transcription and translation is the molecular basis underlying the mechanism of both central and peripheral clocks. Xenopus laevis embryonic melanophores respond to light with melanin granule dispersion, respon...

journal_title：Photochemistry and photobiology

authors： Magalhães Moraes MN,de Oliveira Poletini M,Ribeiro Ramos BC,de Lima LH,de Lauro Castrucci AM

更新日期：2014-05-01 00:00:00

abstract：:The photoinduced covalent binding of the title compound to native and heat denatured DNA is described. The level of binding has been measured by UV (for DNA) and atomic absorption (for Rh) analysis. Quantum efficiencies of 6.4 x 10(-4) mol Rh per mol photons and 1.6 x 10(-3) mol Rh per mol photons have been determined...

journal_title：Photochemistry and photobiology

authors： Mahnken RE,Bina M,Deibel RM,Luebke K,Morrison H

更新日期：1989-04-01 00:00:00

abstract：:A 2-year field study on the effect of different light environments, obtained by using cladding materials (polyethylene films and shade net) able to cut off specific regions of the photosynthetically active radiation and ultraviolet wavebands, on the growth and phenylpropanoids content of Achillea collina grown in the ...

journal_title：Photochemistry and photobiology

authors： Giorgi A,Manzo A,Vagge I,Panseri S

更新日期：2014-01-01 00:00:00

abstract：:The dependence of autofluorescence properties on the metabolic and functional engagement and on the transformation condition was studied on single cells. Normal Galliera rat fibroblasts at low subculture passage (cell strain), at high subculture passage (stabilized cell line), and transformed cell line derived from a ...

journal_title：Photochemistry and photobiology

authors： Croce AC,Spano A,Locatelli D,Barni S,Sciola L,Bottiroli G

更新日期：1999-03-01 00:00:00