Characterization of 3-Acetyl Chlorophyll a and 3-Acetyl Protochlorophyll a Accommodated in the B800 Binding Sites of Photosynthetic Light-Harvesting Complex 2 in the Purple Photosynthetic Bacterium Rhodoblastus acidophilus.

abstract：:Positively charged zinc containing or metal free phthalocyanines 6a-c and 7a-c were prepared via a three step procedure starting from 4-nitrophthalonitrile. The phthalocyanines contain alkyl chains of different length in order to influence the hydrophilic vs lipophilic character of the compounds. The partition between...

journal_title：Photochemistry and photobiology

authors： Wöhrle D,Iskander N,Graschew G,Sinn H,Friedrich EA,Maier-Borst W,Stern J,Schlag P

更新日期：1990-03-01 00:00:00

abstract：:In this work, the changes in isoflavone levels and the expression of genes involved in their biosynthesis were studied in two Astragalus by UPLC-MS and real-time PCR after 10 days of UV-B treatment (λmax  = 313 nm, 804 J m-2 ). Isoflavones were significantly induced by UV-B irradiation. The influence might be activate...

journal_title：Photochemistry and photobiology

authors： Liu Y,Liu J,Wang Y,Abozeid A,Tian DM,Zhang XN,Tang ZH

更新日期：2018-01-01 00:00:00

abstract：:We have investigated the factors that affect the virucidal activity of methylene blue (MB) photosensitization. The M13 bacteriophage was more rapidly inactivated at higher temperatures (6 degrees C < 24 degrees C < 38 degrees C). Rate constants for inactivation were 0.072, 0.139 and 0.260 (log10 inactivation)/ (J/cm2)...

journal_title：Photochemistry and photobiology

authors： Abe H,Wagner SJ,Kuwabara M,Kamo N,Ikebuchi K,Sekiguchi S

更新日期：1997-05-01 00:00:00

abstract：:Tetracycline molecules offer several sites for peroxidative metabolism of the type known to lead to oxygen consumption and electronic excitation. Accordingly, when tetracycline and chlortetracycline were exposed to horseradish peroxidase in the presence of hydrogen peroxide, oxygen was taken up and light emission was ...

journal_title：Photochemistry and photobiology

authors： Gilio VE,Cilento G

更新日期：1993-09-01 00:00:00

abstract：:A structural subunit (called B816) has been isolated from the B875 light-harvesting complex of Rhodobacter capsulatus using a detergent-mediated dissociation of chromatophores. Rb. capsulatus MW442 (B800-850- B875+ car+) chromatophores were extracted with benzene and titrated with octyl glucoside (OG) to shift the nea...

journal_title：Photochemistry and photobiology

authors： Heller BA,Loach PA

更新日期：1990-05-01 00:00:00

abstract：:Phototropin is a blue light-activated photoreceptor that plays a dominant role in the phototropism of plants. The protein contains two subunits that bind flavin mononucleotide (FMN), which are responsible for the initial steps of the light-induced reaction. It has been proposed that the photoexcited flavin molecule ad...

journal_title：Photochemistry and photobiology

authors： Neiss C,Saalfrank P

更新日期：2003-01-01 00:00:00

abstract：:The classic method of photometric curves for photosensitivity determination has been extended to the case of photoreversible reactions and applied to the octopus rhodopsin --> acid metarhodopsin photoreaction. In such cases, measurements at one irradiation wavelength yield the sum of the photosensitivities of the forw...

journal_title：Photochemistry and photobiology

authors： Dixon SF,Cooper A

更新日期：1987-07-01 00:00:00

abstract：:Photobiomodulation therapy (PBMT) has anti-inflammatory, analgesic and regenerative properties. This systematic review aimed to critically appraise the published data of in vivo human randomized clinical trials (RCTs), and present a comprehensive overview of the efficacy of PBMT, as an adjunct to the nonsurgical perio...

journal_title：Photochemistry and photobiology

authors： Dalvi S,Benedicenti S,Hanna R

更新日期：2020-10-24 00:00:00

abstract：:Catalases are oxidized by singlet oxygen giving rise to more acidic conformers detected in zymograms after electrophoresis in polyacrylamide gels. This shift in catalase mobility can be indicative of singlet oxygen production in vivo. Catalase from human cells, as from many organisms, is susceptible to in vitro modifi...

journal_title：Photochemistry and photobiology

authors： Lledías F,Hansberg W

更新日期：1999-12-01 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

authors： Mobilio S,Tondelli L,Capobianco M,Gia O

更新日期：1995-02-01 00:00:00

abstract：:Photoautotrophic growth of Chlamydomonas reinhardtii was shown to be independent of the presence of atmospheric oxygen. Under constant light and photoautotrophic conditions, C. reinhardtii grew equally well in either air or 367 PPM CO2-in-He. During 12-h light-dark cycles, the cells in air grew substantially faster th...

journal_title：Photochemistry and photobiology

authors： Graves DA,Spradlin GM,Greenbaum E

更新日期：1990-09-01 00:00:00

abstract：:Photodynamic therapy (PDT) is an increasingly popular anticancer treatment that uses photosensitizer, light and tissue oxygen to generate cytotoxic reactive oxygen species (ROS) within illuminated cells. Acting to counteract ROS-mediated damage are various cellular antioxidant pathways. In this study, we combined PDT ...

journal_title：Photochemistry and photobiology

authors： Kimani SG,Phillips JB,Bruce JI,MacRobert AJ,Golding JP

更新日期：2012-01-01 00:00:00

abstract：:Tin oxide nanoparticles about 4 nm in size were successfully synthesized using hydrothermal method. The photocatalytic activity of the particles was determined by the decolorization of malachite green (MG) and titanium yellow (TY) under UV light. 12 ppm of MG and TY were used for the solution with an initial volume of...

journal_title：Photochemistry and photobiology

authors： Esen B,Yumak T,Sınağ A,Yıldız T

更新日期：2011-03-01 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：: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：:Identification of natural products capable of affording protection against UVB radiation-induced inflammatory responses and generation of oxidative stress may have important human health implications. The UVB exposure-induced skin injury and oxidative stress has been associated with a variety of skin disease condition...

journal_title：Photochemistry and photobiology

authors： Katiyar SK,Matsui MS,Elmets CA,Mukhtar H

更新日期：1999-02-01 00:00:00

abstract：:Patients infected with human immunodeficiency virus (HIV) have a high prevalence of UV radiation-responsive skin diseases including psoriasis, pruritus, eosinophilic folliculitis and eczemas. On the other hand, UV has been shown to suppress T cell-mediated immune responses and to induce activation and replication of H...

journal_title：Photochemistry and photobiology

authors： Adams ML,Houpt KR,Cruz PD Jr

更新日期：1996-08-01 00:00:00

abstract：:We have compared the cytotoxicity of daunomycin in vitro to highly differentiated normal epithelial cells (Fisher rat thyroid cells, FRTL-5) and to two neoplastic cell lines, a thyroid carcinoma (TK-6) and its lung metastasis (MPTK-6). Whereas the cell lines are equally sensitive to the drug in the dark, if irradiated...

journal_title：Photochemistry and photobiology

authors： Andreoni A,Colasanti A,Kisslinger A,Mastrocinque M,Portella G,Riccio P,Roberti G

更新日期：1993-05-01 00:00:00

abstract：:The photocycle in photoactive yellow protein (PYP) crystals was studied by single-crystal absorption spectroscopy with experimental setups for low-temperature and time-resolved measurements. Thin and flat PYP crystals, suitable for light absorption studies, were obtained using special crystallization conditions. Illum...

journal_title：Photochemistry and photobiology

authors： Kort R,Ravelli RB,Schotte F,Bourgeois D,Crielaard W,Hellingwerf KJ,Wulff M

更新日期：2003-08-01 00:00:00

abstract：:More scheduled outdoor stay is increasingly advocated for school children. This study measured 2(nd) , 5(th) and 8(th) graders' erythemal UV-exposure in September, March and May at four Swedish schools. We related those exposures, as fractions of total available ambient radiation, to the schools outdoor environments d...

journal_title：Photochemistry and photobiology

authors： Pagels P,Wester U,Söderström M,Lindelöf B,Boldemann C

更新日期：2016-01-01 00:00:00

abstract：:The UV radiation environment on planetary surfaces and within atmospheres is of importance in a wide range of scientific disciplines. Solar UV radiation is a driving force of chemical and organic evolution and serves also as a constraint in biological evolution. In this work we modeled the transmission of present and ...

journal_title：Photochemistry and photobiology

authors： Rontó G,Bérces A,Lammer H,Cockell CS,Molina-Cuberos GJ,Patel MR,Selsis F

更新日期：2003-01-01 00:00:00

abstract：:The multifunctional polypeptide cyclosporin synthetase (CySyn) remains one of the most complex nonribosomal peptide synthetase described. In this study we used a highly specific photoaffinity labeling procedure with the natural cofactor S-adenosyl-L-methionine (AdoMet), 14C-isotopically labeled at the Sdelta methyl gr...

journal_title：Photochemistry and photobiology

authors： Velkov T,Lawen A

更新日期：2003-02-01 00:00:00

abstract：:This review deals with the biophysical aspects of flavin-based photosensors, comprising cryptochromes, LOV (Light, Oxygen and Voltage) and BLUF (Blue Light sensing Using FAD) proteins. Special emphasis is given to structural issues, photocycle quantum yields and energetics, mechanism of the light-triggered reactions, ...

journal_title：Photochemistry and photobiology

authors： Losi A

更新日期：2007-11-01 00:00:00

abstract：:Ultraviolet A radiation participates in cytotoxicity and carcinogenesis of the skin by a mechanism involving the generation of reactive oxygen species. Endogenous antiradical defense systems utilize metalloenzymes including Se-dependent glutathione peroxidase and Cu and Zn superoxide dismutase. The aim of the present ...

journal_title：Photochemistry and photobiology

authors： Leccia MT,Richard MJ,Beani JC,Faure H,Monjo AM,Cadet J,Amblard P,Favier A

更新日期：1993-10-01 00:00:00

abstract：:Macroalgae distributed in intertidal zones experience a series of environmental changes, such as periodical desiccation associated with tidal cycles, increasing CO2 concentration and solar UVB (280-315 nm) irradiance in the context of climate change. We investigated how the economic red macroalga, Pyropia haitanensis,...

journal_title：Photochemistry and photobiology

authors： Xu J,Gao K

更新日期：2015-11-01 00:00:00

abstract：:Syntheses for the new photosensitizers HOSiPcOSi(CH3)2(CH2)3N(CH1)1 or 3(CH3)2, Pc 34 and Pc 25, have been developed and the order of activity of these photosensitizers and the previously reported photosensitizer Pc 4, HOSiPcOSi(CH3)2(CH2)3N(CH3)2, in the dark and with broad-band red light toward Plasmodium falciparum...

journal_title：Photochemistry and photobiology

authors： Zhao XJ,Lustigman S,Li YS,Kenney ME,Ben-Hur E

更新日期：1997-08-01 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：:Unidirectional blue light directs the rhizoid-thallus axis in the apolar zygote of the brown alga, Silvetia compressa. This effect is mediated by an increase in the intracellular concentration of guanosine 3', 5'-cyclic monophosphate. In this study we show the identification of a rhodopsin-like protein, by means of an...

journal_title：Photochemistry and photobiology

authors： Gualtieri P,Robinson KR

更新日期：2002-01-01 00:00:00

abstract：:Exposure to ultraviolet radiation results in increased levels of intradermal cis-urocanic acid (cUCA) and alters cutaneous immunity by interfering with processing and presentation of antigen by Langerhans cells. Reports on effects of systemic immunotoxicity with 30 day cUCA exposure in laboratory rodents include thymi...

journal_title：Photochemistry and photobiology

authors： Prater MR,Gogal RM Jr,De Fabo EC,Longstreth J,Holladay SD

更新日期：2003-04-01 00:00:00

abstract：:This research examines the behavior of ground-level solar UV radiation as measured by eight broadband meters in the continental United States during the period from late 1994 to late 1998. The goal is to define the variability that occurs in UV irradiance over time scales ranging from one to several years. The monthly...

journal_title：Photochemistry and photobiology

authors： Frederick JE,Slusser JR,Bigelow DS

更新日期：2000-10-01 00:00:00