The origin of magnetic field dependent recombination in alkylcobalamin radical pairs.

abstract：:Advanced glycation endproducts (AGEs) have been suggested as photosensitizers that are capable of mediating eye lens photo-damage during aging. In the present work, we investigate the photo-crosslinking and oxidation of bovine lens proteins sensitized by AGEs, with special regard to low oxygen conditions. A mechanisti...

journal_title：Photochemistry and photobiology

authors： Fuentealba D,Friguet B,Silva E

更新日期：2009-01-01 00:00:00

abstract：:The binding interactions of three naphthalimide derivatives with heteropoly nucleic acids have been evaluated using fluorescence, absorption and circular dichroism spectroscopies. Mono- and bifunctionalized naphthalimides exhibit sequence-dependent variations in their affinity toward DNA. The heteropoly nucleic acids,...

journal_title：Photochemistry and photobiology

authors： McMasters S,Kelly LA

更新日期：2007-07-01 00:00:00

abstract：:Here, 10 guidelines are presented for a standardized definition of type I and type II photosensitized oxidation reactions. Because of varied notions of reactions mediated by photosensitizers, a checklist of recommendations is provided for their definitions. Type I and type II photoreactions are oxygen-dependent and in...

journal_title：Photochemistry and photobiology

authors： Baptista MS,Cadet J,Di Mascio P,Ghogare AA,Greer A,Hamblin MR,Lorente C,Nunez SC,Ribeiro MS,Thomas AH,Vignoni M,Yoshimura TM

更新日期：2017-07-01 00:00:00

abstract：:We report the spectroscopic properties of fluorescein, x-rhodamine, tetramethyl-rhodamine, attached to single strand, duplex DNA, and to the digestion products by DNAse I. The properties reported include: molar absorptivity, quantum yield, absorbance and fluorescence spectra, fluorescence lifetime, intrinsic lifetime ...

journal_title：Photochemistry and photobiology

authors： Delgadillo RF,Parkhurst LJ

更新日期：2010-03-01 00:00:00

abstract：:Time-resolved reflectance and transmittance spectroscopy was applied to measure in vivo the absorption and transport scattering spectra of the female breast from 610 to 1010 nm. Three measurement configurations were used to probe different breast regions, and data were collected two or three times in each of the five ...

journal_title：Photochemistry and photobiology

authors： Cubeddu R,D'Andrea C,Pifferi A,Taroni P,Torricelli A,Valentini G

更新日期：2000-09-01 00:00:00

abstract：:The in vitro cell survival, localization and ultrastructural changes following irradiation were examined in 9L glioma cells sensitized with a new photosensitizer, lysyl chlorin p6 (LCP). In clonogenic assays, LCP was 10-100-fold more phototoxic than photofrin II on a microgram/mL basis. Lysyl chlorin p6 uptake was blo...

journal_title：Photochemistry and photobiology

authors： Leach MW,Higgins RJ,Autry SA,Boggan JE,Lee SJ,Smith KM

更新日期：1993-11-01 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：: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：:Chaetopterus variopedatus has been studied for over a century in terms of its physiology, ecology and life history. One focus of research is on its intrinsic bioluminescent emissions, which can be observed as a blue light emitted from the extremities of individual body segments, or as a secreted mucus. Even though res...

journal_title：Photochemistry and photobiology

authors： Mirza JD,Migotto ÁE,Yampolsky IV,de Moraes GV,Tsarkova AS,Oliveira AG

更新日期：2020-07-01 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：:Three substituted tetraazaporphyrins, octa-(4-tert-butylphenyl)-tetrapyrazinoporphyrazine, tetra-(4-tert-butyl)phthalocyanine and tetra-(4-tert-butyl)phthalocyanatomagnesium(t4-PcMg), were spectroscopically checked in solutions and liposomes with respect to suitability as potential sensitizers of a possible new start ...

journal_title：Photochemistry and photobiology

authors： Teuchner K,Pfarrherr A,Stiel H,Freyer W,Leupold D

更新日期：1993-03-01 00:00:00

abstract：:The intrinsic autofluorescence properties of biological tissues can be affected by the occurrence of histological and biochemical alterations induced by pathological processes. In this study the potential of autofluorescence to distinguish tumor from normal tissues was investigated with the view of a real-time diagnos...

journal_title：Photochemistry and photobiology

authors： Croce AC,Fiorani S,Locatelli D,Nano R,Ceroni M,Tancioni F,Giombelli E,Benericetti E,Bottiroli G

更新日期：2003-03-01 00:00:00

abstract：:It is generally assumed that a central metal is essential for the efficiency of phthalocyanines in photodynamic therapy (PDT) of cancer. Contrary to the set opinion, the results of the present study indicate that the metal-free sulfonated phthalocyanines (H2PcSn, where n is the number of sulfonate groups per molecule)...

journal_title：Photochemistry and photobiology

authors： Feofanov A,Grichine A,Karmakova T,Kazachkina N,Pecherskih E,Yakubovskaya R,Luk'yanets E,Derkacheva V,Egret-Charlier M,Vigny P

更新日期：2002-05-01 00:00:00

abstract：:Use of near infrared instead of visible light would markedly improve tissue penetration, making larger tumors candidates for photochemotherapy. Because common photesensitizers exhibit virtually no absorption in this wavelength region, conditions are required where the simultaneous action of two photons is possible. He...

journal_title：Photochemistry and photobiology

authors： Lenz P

更新日期：1995-08-01 00:00:00

abstract：:Dark-grown leaves of maize (Zea mays), wheat (Triticum aestivum), wild-type pea (Pisum sativum) and its light-independent photomorphogenesis mutant (lip1) have different proportions of protochlorophyllide (Pchlide) forms as revealed by low-temperature fluorescence emission spectra. Four discrete spectral forms of Pchl...

journal_title：Photochemistry and photobiology

authors： Myśliwa-Kurdziel B,Amirjani MR,Strzałka K,Sundqvist C

更新日期：2003-08-01 00:00:00

abstract：:This study assessed the effects of photobiomodulation (PBM) to cells previously exposed to lipopolysaccharides (LPS). Human gingival fibroblasts (HGF) and epithelial cells (HaCaT) were seeded in wells of 24-well plates containing complete culture medium (DMEM). After 24 h, the DMEM was replaced by serum-free DMEM, and...

journal_title：Photochemistry and photobiology

authors： Pansani TN,Basso FG,Soares DG,Turrioni APDS,Hebling J,de Souza Costa CA

更新日期：2018-05-01 00:00:00

abstract：:Channelrhodopsins act as photoreceptors for control of motility behavior in flagellates and are widely used as genetically targeted tools to optically manipulate the membrane potential of specific cell populations ("optogenetics"). The first two channelrhodopsins were obtained from the model organism Chlamydomonas rei...

journal_title：Photochemistry and photobiology

authors： Hou SY,Govorunova EG,Ntefidou M,Lane CE,Spudich EN,Sineshchekov OA,Spudich JL

更新日期：2012-01-01 00:00:00

abstract：:To improve the understanding of human skin autofluorescence emission, the spectroscopic and microscopic characteristics of skin autofluorescence were studied using a combined fluorescence and reflectance spectroanalyzer and a fiber optic microspectrophotometer. The autofluorescence spectra of in vivo human skin were m...

journal_title：Photochemistry and photobiology

authors： Zeng H,MacAulay C,McLean DI,Palcic B

更新日期：1995-06-01 00:00:00

abstract：:Targeted mutagenesis and gene knock-out can be mediated by triple helix-forming oligonucleotides (TFO) linked to mutagenic agents, such as psoralen. However, this strategy is limited by the availability of homopurine/homopyrimidine stretches at or near the target site because such sequences are required for high-affin...

journal_title：Photochemistry and photobiology

authors： Raha M,Lacroix L,Glazer PM

更新日期：1998-03-01 00:00:00

abstract：:The design, synthesis and application of a new fluorescent-labeling reagent for collagen has been developed as a prerequisite for the design of a photoactivated collagen-crosslinking compound for surgical wound closure. The amine groups in collagen are the targets of a rational design for a new fluorophore because nat...

journal_title：Photochemistry and photobiology

authors： Timberlake GT,Reddy GK,Stehno-Bittel L,Weber JF,Amslinger S,Givens RS

更新日期：2002-11-01 00:00:00

abstract：:Near-UV (337 nm) photoactivation of the 5-hydroxytryptophan decarboxylation reaction producing serotonin has been observed. The photoactivation effect was investigated as a function of fluence rate and fluence, and pH. Photoactivation of decarboxylase activity was found to occur at nearly neutral pH values (low activi...

journal_title：Photochemistry and photobiology

authors： Fraikin GY,Strakhovskaya MG,Ivanova EV,Rubin AB

更新日期：1989-04-01 00:00:00

abstract：:Using information on solar irradiance at different latitudes derived from a radiative transfer model and a detailed in vivo action spectrum for immune suppression in a murine system, we report here calculations of the "biologically effective" irradiance of sunlight for immune suppression. From 40 degrees N to 40 degre...

journal_title：Photochemistry and photobiology

authors： De Fabo EC,Noonan FP,Frederick JE

更新日期：1990-10-01 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

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：:The distribution of anthocyanins in grape (Vitis vinifera L.) bunches from the Sangiovese cultivar was measured nondestructively by chlorophyll fluorescence imaging using two excitation light bands at 550 and 650 nm in sequence. The pixel intensity in the derived logarithm of the fluorescence excitation ratio image wa...

journal_title：Photochemistry and photobiology

authors： Agati G,Traversi ML,Cerovic ZG

更新日期：2008-11-01 00:00:00

abstract：:The pharmacokinetics of Zn phthalocyanine (ZnPc) encapsulated in dipalmitoyl-phosphatidylcholine (DPPC) liposomes, injected intravenously in Skh:HR-1 nude mice, was monitored by two in vitro techniques and one in vivo technique, all based on fluorescence spectroscopy. The in vitro methods involve either fluorescence m...

journal_title：Photochemistry and photobiology

authors： Biolo R,Jori G,Kennedy JC,Nadeau P,Pottier R,Reddi E,Weagle G

更新日期：1991-01-01 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：: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：:Solid-state NMR spectroscopy gives a powerful avenue for investigating G protein-coupled receptors and other integral membrane proteins in a native-like environment. This article reviews the use of solid-state (2)H NMR to study the retinal cofactor of rhodopsin in the dark state as well as the meta I and meta II photo...

journal_title：Photochemistry and photobiology

authors： Brown MF,Martínez-Mayorga K,Nakanishi K,Salgado GF,Struts AV

更新日期：2009-03-01 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