Photooxidation of tryptophan leading to 2-aminoacetophenone--a possible reason for the untypical aging off-flavor in wine.

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：: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：: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：: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：:The fluoroquinolone (FQ) antibiotics photosensitize human skin to solar UV radiation and are reported to photosensitize tumor formation in mouse skin. As tumor initiation will not occur without genotoxic insult, we examined the potential of ciprofloxacin, lomefloxacin, fleroxacin, BAYy3118 (a recently developed monofl...

journal_title：Photochemistry and photobiology

authors： Reavy HJ,Traynor NJ,Gibbs NK

更新日期：1997-09-01 00:00:00

abstract：:The photochemical reactions of the 1-deaza derivative of riboflavin (RF) have been studied by sub-ps time-resolved fluorescence spectroscopy. A potential effect of the solvent polarity and hydrogen bonding capability on the excited state (ES) dynamics was tested by measuring 1-deaza RF in water and, after acetylation ...

journal_title：Photochemistry and photobiology

authors： Slavov C,Mansurova M,Holzwarth AR,Gärtner W

更新日期：2010-01-01 00:00:00

abstract：:The retinal protonated Schiff base of bacteriorhodopsin is photoreactive to reducing agents such as NaBH4. In the present work we have studied the effect of different protein hydration levels on the photoreductive reaction, as well as the consequences of preventing isomerization around the critical C13=C14 retinal dou...

journal_title：Photochemistry and photobiology

authors： Aharoni A,Ottolenghi M,Sheves M

更新日期：2002-06-01 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：:Quantum yields for the formation of superoxide ions, O2-., and singlet oxygen, 1O2, were determined during the photolyses of gilvocarcin M (GM) in air-saturated dry dimethylsulfoxide (DMSO) and in 45:55 (vol/vol) DMSO-water mixtures. The quantum yield for the photoreduction of methyl viologen by GM in nitrogen-saturat...

journal_title：Photochemistry and photobiology

authors： Alegría AE,Zayas L,Guevara N

更新日期：1995-09-01 00:00:00

abstract：:Photosynthetic bacteria are attractive for biotechnology because they produce no oxygen and so H2 -production is not inhibited by oxygen as occurs in oxygenic photoorganisms. Rhodopseudomonas palustris and Afifella marina containing BChl a can use irradiances from violet near-UV (VNUV) to orange (350-650 nm) light and...

journal_title：Photochemistry and photobiology

authors： Ritchie RJ

更新日期：2013-09-01 00:00:00

abstract：:Extracellular pH was measured continuously and noninvasively in hairless mice using a transcutaneous spectrofluorometric technique and a fluorescent pH probe, bis-carboxyethyl carboxyfluorescein (BCECF). The acid form of BCECF was injected intravenously. An optical fiber system excited the fluorescent probe at 450 and...

journal_title：Photochemistry and photobiology

authors： Russell DA,Pottier RH,Valenzeno DP

更新日期：1994-03-01 00:00:00

abstract：:Absolute fluorescence quantum yields are reported for the rhodamine 6G cation and the fluorescein dianion dyes in nine solvents. This information is combined with previously reported fluorescence lifetimes to deduce radiative and nonradiative decay rates. Along the alcohol series from methanol to octanol, rhodamine 6G...

journal_title：Photochemistry and photobiology

authors： Magde D,Wong R,Seybold PG

更新日期：2002-04-01 00:00:00

abstract：:Photoisomerization of a protein-bound chromophore is the basis of light sensing and signaling in many photoreceptors. Phytochrome photoreceptors can be photoconverted reversibly between the Pr and Pfr states through photoisomerization of the methine bridge between rings C and D. Ground-state heterogeneity of the chrom...

journal_title：Photochemistry and photobiology

authors： Stensitzki T,Yang Y,Wölke AL,Knapp EW,Hughes J,Mroginski MA,Heyne K

更新日期：2017-05-01 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：:There is a need to improve the selectivity of photodynamic therapy and for better targeting of tumor cells within specific tumor compartments. Selective in vitro phototoxicity of a human bladder carcinoma cell line 647V has been achieved by targeting sulfonated aluminum phthalocyanines (AlSPc) with monoclonal antibodi...

journal_title：Photochemistry and photobiology

authors： Morgan J,Lottman H,Abbou CC,Chopin DK

更新日期：1994-11-01 00:00:00

abstract：:Ultraviolet (UV) radiation is among the most prevalent environmental factors that influence human health and disease. Even 1 h of UV irradiation extensively damages the genome. To cope with resulting deleterious DNA lesions, cells activate a multitude of DNA damage response pathways, including DNA repair. Strikingly, ...

journal_title：Photochemistry and photobiology

authors： Lee JW,Ratnakumar K,Hung KF,Rokunohe D,Kawasumi M

更新日期：2020-05-01 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：:Abstract- Time-resolved transmittance was used to extract in vivo optical properties of leaves of green plants experimentally. In time-resolved transmittance measurements an ultrashort light pulse is directed onto the surface of the object and the transmitted light is measured with a time resolution in the range of pi...

journal_title：Photochemistry and photobiology

authors： Johansson J,Berg R,Pifferi A,Svanberg S,Björn LO

更新日期：1999-02-01 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：:Latia neritoides is a small limpet-like snail that produces a bright green bioluminescence (BL) via a unique light-emitting system. The process, mechanism, and even light emitter of its light emission remain unknown, although this BL has been known for decades. Unlike the other BL systems, neither the luciferin (Luc) ...

journal_title：Photochemistry and photobiology

authors： Yu M,Ohmiya Y,Naumov P,Liu YJ

更新日期：2018-05-01 00:00:00

abstract：:Generating accurate population-specific public health messages regarding sun protection requires knowledge about seasonal variation in sun exposure in different environments. To address this issue for a subtropical area of Australia, we used polysulphone badges to measure UVR for the township of Nambour (26 degrees la...

journal_title：Photochemistry and photobiology

authors： Neale RE,Hamilton AR,Janda M,Gies P,Green AC

更新日期：2010-03-01 00:00:00

abstract：:Gel sequencing experiments with the 5'- and 3'-end-labeled oligonucleotides d(A3GA4GA5GA6GA3G) and d(AT)10 have demonstrated that dimeric adenine photoproducts and thymine-adenine photoadducts constitute alkali-labile lesions in UV-irradiated DNA. On treatment with hot piperidine, DNA strand breakage occurs predominan...

journal_title：Photochemistry and photobiology

authors： Hejmadi V,Stevenson C,Kumar S,Davies RJ

更新日期：1994-02-01 00:00:00

abstract：:The chloride effect on the photobleaching process of iodopsin, a chicken red-sensitive cone visual pigment, was studied in detail by time-resolved low-temperature spectroscopy at -40 degrees C to -10 degrees C. Decay-associated difference spectra obtained by kinetic analysis using the singular value decomposition meth...

journal_title：Photochemistry and photobiology

authors： Imamoto Y,Shichida Y

更新日期：2008-07-01 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：:Porous ZnS and ZnO nano-crystal films were fabricated via a three-step procedure. First, Zn(CH3 COO)2 /Silk Fibroin nanofiber mats were prepared by coaxial electrospinning. Second, Zn(CH3 COO)2 /Silk Fibroin mats were immersed in NaS solution to react with S2- to obtain ZnS/Silk Fibroin nanofiber mats. Finally, ZnO po...

journal_title：Photochemistry and photobiology

authors： Wang H,Liang L,Cheng X,Luo Y,Sun S

更新日期：2018-01-01 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：:Although allergic rhinitis is not life threatening, it significantly influences the quality of a patient's life. This study is intended to evaluate the safety and efficacy of phototherapy with low-level energy of a 650 nm laser irradiation system in perennial allergic rhinitis patients. This clinical trial was an open...

journal_title：Photochemistry and photobiology

authors： Lee HM,Park MS,Park IH,Lee SH,Lee SK,Kim KS,Choi H

更新日期：2013-05-01 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：:The phototoxic anti-hyperlipoproteinemic drug fenofibrate was found to be photolabile under aerobic and anaerobic conditions. Irradiation under argon of a methanol solution of this drug produced the photoproducts isopropyl 4-(1-[4-chlorophenyl]-1,2-dihydroxy)ethylphenoxyisobutyrate, 1,2-bis(4-chlorophenyl)-1,2bis (4-[...

journal_title：Photochemistry and photobiology

authors： Vargas F,Canudas N,Miranda MA,Boscá F

更新日期：1993-10-01 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