Spectral shift of ultraweak photon emission from sweet potato during a defense response.

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

authors： Rakshit S,Goswami N,Pal SK

更新日期：2012-01-01 00:00:00

abstract：:Fluoresceinyl cypridina luciferin analog (FCLA) is a chemiluminescence (CL) probe for detecting reactive oxygen species (ROS). Its efficiency for detecting singlet oxygen (1O2) can be significantly enhanced in the presence of human serum albumin (HSA). This phenomenon may apply to important applications for both resea...

journal_title：Photochemistry and photobiology

authors： Zhou J,Xing D,Chen Q

更新日期：2006-07-01 00:00:00

abstract：:5-geranoxypsoralen (Bergamottin) does not photosensitize bacteria or a bacterial virus. It does, however, photosensitize mammalian cells in tissue culture. Irradiation with either black light (300-400 nm) or fluorescent ceiling lights produced at least four photobiologically active degradation products, the chemical n...

journal_title：Photochemistry and photobiology

authors： Ashwood-Smith MJ,Ceska O,Warrington PJ,Morris TF,Altamirano M

更新日期：1992-04-01 00:00:00

abstract：:Urban environments can have high-risk spaces that can provide excess personal sun exposure, such as urban or street canyons, and the spaces between buildings, among others. In these urban spaces, sun exposure can be high or low depending on several factors. Polysulphone film (PSF) was used to assess possible daily sol...

journal_title：Photochemistry and photobiology

authors： Wright CY,du Preez DJ,Martincigh BS,Allen MW,Millar DA,Wernecke B,Blesic S

更新日期：2020-09-01 00:00:00

abstract：:A novel antibody-fluorescence method has been developed to elucidate the chromophore topography in phytochrome as it undergoes a photochromic transformation. Förster energy transfer from N-terminal bound, fluorescently labeled Oat-25 Fab antibody fragments to the phytochrome chromophore was measured. The results sugge...

journal_title：Photochemistry and photobiology

authors： Farrens DL,Cordonnier MM,Pratt LH,Song PS

更新日期：1992-11-01 00:00:00

abstract：:Direct irradiation of estrone aryl and methyl sulfonates in different organic solvents under nitrogen atmosphere was investigated under steady-state conditions. The estrone derivatives reacted efficiently through the photo-Fries rearrangement reaction involving [1;3]-sulfonyl migration providing the ortho-sulfonyl est...

journal_title：Photochemistry and photobiology

authors： Quindt MI,Gola GF,Ramirez JA,Bonesi SM

更新日期：2021-01-01 00:00:00

abstract：:Fabrea salina is a marine ciliate that shows photomotile responses such as positive phototaxis and a step-down photophobic reaction. We found that preilluminated F. salina cells show a phototactic response significantly greater than that of dark-adapted cells when exposed to the same phototactic light stimulus. In par...

journal_title：Photochemistry and photobiology

authors： Marangoni R,Colombetti G

更新日期：2003-02-01 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：:Photolysis of ester 1 in argon-saturated methanol and acetonitrile does not produce any product, whereas irradiation of 1 in oxygen-saturated methanol yields peroxide 2. Laser flash photolysis studies demonstrate that 1 undergoes intramolecular H atom abstraction to form biradical 3 (λmax ~340 nm), which intersystem c...

journal_title：Photochemistry and photobiology

authors： Das A,Lao EA,Gudmundsdottir AD

更新日期：2016-05-01 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

authors： Onuki J,Ribas AV,Medeiros MH,Araki K,Toma HE,Catalani LH,Di Mascio P

更新日期：1996-03-01 00:00:00

abstract：:We developed a novel method for the isolation of the PSI-LHCI-LHCII complex from spinach leaves. The supercomplex was resolved into a core complex (CPI), LHCII trimers, LHCI dimers and LHCII monomers using green gel electrophoresis. We then investigate changes in the fluorescence and absorption spectra of PSI-LHCI-LHC...

journal_title：Photochemistry and photobiology

authors： Qin X,Wang W,Wang K,Xin Y,Kuang T

更新日期：2011-01-01 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：:G protein-coupled receptors (GPCRs) are involved in the control of virtually all aspects of our behavior and physiology. Activated receptors catalyze nucleotide exchange in heterotrimeric G proteins (composed of alpha.GDP, beta and gamma subunits) on the inner surface of the cell membrane. The GPCR rhodopsin and the G...

journal_title：Photochemistry and photobiology

authors： Chen Y,Herrmann R,Fishkin N,Henklein P,Nakanishi K,Ernst OP

更新日期：2008-07-01 00:00:00

abstract：:The immunological consequences of exposure to UVA (320-400 nm) radiation are unclear. This study describes the relationship between the generation of epidermal cis-urocanic acid and the ability to respond to a contact-sensitizing agent, in hairless mice exposed to different UV radiation sources, which incorporate succ...

journal_title：Photochemistry and photobiology

authors： Reeve VE,Boehm-Wilcox C,Bosnic M,Cope R,Ley RD

更新日期：1994-09-01 00:00:00

abstract：:High intensity two-photon picosecond excitation at 266 nm (effective energy 9.2 eV) has been shown to cause efficient photolysis of thymine in aqueous solution. Experimental results for the quantum yield of solvated electrons, phi (eaq-), and the net consumption of thymine, phi(-Thy) have been interpreted (Oraevsky an...

journal_title：Photochemistry and photobiology

authors： Daniels M

更新日期：1991-07-01 00:00:00

abstract：:In the vertebrate retina, rods mediate twilight vision and cones mediate daylight vision. Their photoresponse characteristics are different. The light-sensitivity of a cone is 10(2)-10(3) times lower than that of a rod. In addition, the photoresponse time course is much faster in cones. The mechanism characterizing co...

journal_title：Photochemistry and photobiology

authors： Tachibanaki S,Shimauchi-Matsukawa Y,Arinobu D,Kawamura S

更新日期：2007-01-01 00:00:00

abstract：:The contribution of DNA strand breaks accumulating in the course of nucleotide excision repair to upregulation of the p53 tumor suppressor protein was investigated in human dermal fibroblast strains after treatment with 254 nm ultraviolet (UV) light. For this purpose, fibroblast cultures were exposed to UV and incubat...

journal_title：Photochemistry and photobiology

authors： Enns L,Murray D,Mirzayans R

更新日期：2000-10-01 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：: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：:There are controversial reports in the literature concerning the reactivity of singlet oxygen ((1)O(2)) with the redox probe 2',7'-dichlorodihydrofluorescein (DCFH). By carefully preparing solutions in which (1)O(2) is quantitatively generated in the presence of DCFH, we were able to show that the formation rate of th...

journal_title：Photochemistry and photobiology

authors： Daghastanli NA,Itri R,Baptista MS

更新日期：2008-09-01 00:00:00

abstract：:The efficacy of photodynamic therapy (PDT) depends upon the amount of photosensitizer accumulated in the malignant tissues. Radachlorin is a popular photosensitizer used in photodynamic therapy to treat various types of cancer. In this study, we have studied the main organelles responsible for the accumulation of rada...

journal_title：Photochemistry and photobiology

authors： Biswas R,Moon JH,Ahn JC

更新日期：2014-09-01 00:00:00

abstract：:An open three-compartment pharmacokinetic model was applied to the in vivo quantitative structure-activity relationship (QSAR) data of a homologous series of pyropheophorbide photosensitizers for photodynamic therapy (PDT). The physical model was a lipid compartment sandwiched between two identical aqueous compartment...

journal_title：Photochemistry and photobiology

authors： Potter WR,Henderson BW,Bellnier DA,Pandey RK,Vaughan LA,Weishaupt KR,Dougherty TJ

更新日期：1999-11-01 00:00:00

abstract：:A novel laser system has been developed to study the effects of multiple laser pulses of differing wavelengths on cutaneous blood vessels in vivo, using the hamster dorsal skin flap preparation and in vitro, using cuvettes of whole or diluted blood. The system permits sequenced irradiation with well-defined intrapulse...

journal_title：Photochemistry and photobiology

authors： Barton JK,Frangineas G,Pummer H,Black JF

更新日期：2001-06-01 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：:Herein, we present a comparative study about the photoinactivation of Staphylococcus aureus (Gram-positive model) and Escherichia coli (Gram-negative model) employing a neutral and a dicationic axially functionalized SiIV -phthalocyanine. Depending on the charge of the siloxane moiety (neutral monosaccharide or cation...

journal_title：Photochemistry and photobiology

authors： Grüner MC,Niemann S,Faust A,Strassert CA

更新日期：2018-09-01 00:00:00

abstract：:The cellular uptake, localization and efflux of meso-tetra-(4-hydroxyphenyl)porphyrin (p-THPP)-loaded nanoparticles have been studied in EMT-6 tumor cells. The effect of blood serum on photocytotoxicity has also been evaluated. Sub-130 nm nanoparticles based on poly(D,L-lactide-co-glycolide) (PLGA) (50:50 PLGA and 75:...

journal_title：Photochemistry and photobiology

authors： Konan YN,Chevallier J,Gurny R,Allémann E

更新日期：2003-06-01 00:00:00

abstract：:The photodynamic effect of hypericin on EMT6 mouse mammary carcinoma cells was investigated in vitro under aerobic and hypoxic conditions. Under aerobic conditions, hypericin-induced photocytotoxicity was dose dependent within a 1-50 microM range. Under hypoxic conditions, cells were resistant to hypericin-induced pho...

journal_title：Photochemistry and photobiology

authors： Thomas C,Pardini RS

更新日期：1992-06-01 00:00:00

abstract：:Dermatophytes are fungi that can cause infections (known as tinea) of the skin, hair and nails because of their ability to use keratin. Superficial mycoses are probably the most prevalent of infectious diseases worldwide. One of the most distinct limitations of the current therapeutic options is the recurrence of the ...

journal_title：Photochemistry and photobiology

authors： Smijs TG,Schuitmaker HJ

更新日期：2003-05-01 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

authors： Lakowicz JR

更新日期：2000-10-01 00:00:00

abstract：:The broad-band normal incidence UVB beam radiation has been measured at Neve Zohar, Dead Sea basin, using a prototype tracking instrument composed of a Model 501A UV-Biometer mounted on an Eppley Solar Tracker Model St-1. The diffuse and beam fraction of the solar global UVB radiation have been determined using the co...

journal_title：Photochemistry and photobiology

authors： Kudish AI,Harari M,Evseev EG

更新日期：2011-01-01 00:00:00