Resolution of the individual tryptophanyl contributions to the near-ultraviolet dichroic activity of apomyoglobin.

abstract：:A new type of photochromic molecule that can be used for diffusion coefficient (D) measurements of various proteins in solution is described. The absorption spectrum of this molecule is changed upon photoexcitation by the trans-cis isomerization reaction. Target proteins were labeled by this photochromic molecule in t...

journal_title：Photochemistry and photobiology

authors： Eitoku T,Terazima M

更新日期：2008-07-01 00:00:00

abstract：:The phototoxic effects of demethylchlortetracycline (DMCT) with UVA radiation on isolated rat liver mitochondria were studied. DMCT at concentration of 21.5 microM with 5.53 x 10(-2) J cm-3 of UVA was found to be a potent uncoupler of oxidative phosphorylation. DMCT alone also uncoupled mitochondria but at higher conc...

journal_title：Photochemistry and photobiology

authors： Takagi S,Mizuno N,Adachi K,Wakabayashi T

更新日期：1990-02-01 00:00:00

abstract：:Although ultraviolet-B (UV-B) radiation is potentially harmful, it is an important component of terrestrial radiation to which plants have been exposed since invading land. Since then, plants have evolved mechanisms to avoid and repair UV radiation damage; therefore, it is not surprising that photomorphogenic response...

journal_title：Photochemistry and photobiology

authors： Gitz DC,Liu-Gitz L

更新日期：2003-12-01 00:00:00

abstract：:Photoprotective formulations containing substances with antioxidant properties in combination have been used as a strategy for the improvement of photoaged skin conditions. However, there is a lack of studies evaluating the clinical efficacy of these substances in young women with signs of photoaging. Thus, the object...

journal_title：Photochemistry and photobiology

authors： Fossa Shirata MM,Maia Campos PMBG

更新日期：2021-02-02 00:00:00

abstract：:Self-aggregation of naturally occurring bacteriochlorophyll (BChl)-e in nonpolar organic solvents was investigated by visible absorption, fluorescence emission and circular dichroism spectra. Cultured brown-colored photosynthetic bacteria have several BChl-e as light-harvesting antenna pigments. Three major BChl-e hom...

journal_title：Photochemistry and photobiology

authors： Saga Y,Matsuura K,Tamiaki H

更新日期：2001-07-01 00:00:00

abstract：:Nucleotide excision repair and the ATR-mediated DNA damage checkpoint are two critical cellular responses to the genotoxic stress induced by ultraviolet (UV) light and are important for cancer prevention. In vivo genetic data indicate that these global responses are coupled. Aziz Sancar et al. developed an in vitro co...

journal_title：Photochemistry and photobiology

authors： Lindsey-Boltz LA

更新日期：2017-01-01 00:00:00

abstract：:The present work is aimed to synthesize CdTe/ZnSe core/shell quantum dots (QDs) in an easy way and to explore the possibilities of its application in in vitro imaging of chicken tissue and embryo. The QDs were prepared using microwave irradiation with different temperatures, which is a very easy and less time-consumin...

journal_title：Photochemistry and photobiology

authors： Moulick A,Blazkova I,Milosavljevic V,Fohlerova Z,Hubalek J,Kopel P,Vaculovicova M,Adam V,Kizek R

更新日期：2015-03-01 00:00:00

abstract：:Although strong fluorescence makes the R-phycoerythrin (R-PE) proteins increasingly useful in biological and clinical assays, they are subject to nonlinear effects including transitions to collective dark states and photodegradation, which complicate quantitative applications. We report measurements of R-PE fluorescen...

journal_title：Photochemistry and photobiology

authors： Gaigalas A,Gallagher T,Cole KD,Singh T,Wang L,Zhang YZ

更新日期：2006-05-01 00:00:00

abstract：:The nature of the interaction in buffered aqueous solution of several homo and heteroleptic ruthenium(II) polypyridyl complexes containing 2,2'-bipyridine (bpy), 2,2'-bipyrazine (bpz), 1,10-phenanthroline (phen), 4,7-diphenyl-1,10-phenanthroline (dip), 3,4,7,8-tetramethyl-1,10-phenanthroline (tmp), 1,4,5,8-tetraazaphe...

journal_title：Photochemistry and photobiology

authors： Kirsch-De Mesmaeker A,Orellana G,Barton JK,Turro NJ

更新日期：1990-09-01 00:00:00

abstract：:Leaf discs, enclosed in a photoacoustic (PA) chamber, generate two types of PA gas-uptake signals under certain conditions. Type I is manifested by a severe signal decrease that develops slowly under very low-light intensity and often reaches negative values. It is partially reversed by low-intensity far-red light. Ty...

journal_title：Photochemistry and photobiology

authors： Malkin S,Havaux M

更新日期：2001-10-01 00:00:00

abstract：:An ongoing study in our laboratories is to examine the relationship of DNA repair defects to human cancer. Our underlying hypothesis has been that human tumors may arise that lack interesting DNA repair pathways if these pathways are important in preventing cancer. In this study, we found that the UV-irradiated adenov...

journal_title：Photochemistry and photobiology

authors： Day RS 3rd,Rasouli-Nia A,Meservy J,Lari SU,Dobler K,Tsunoda S,Miyakoshi J,Takebe H,Murray D

更新日期：1999-08-01 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：: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 synthesis of some bromine-substituted rhodamine derivatives viz., 4,5-dibromorhodamine methyl ester (dye 2) and 4,5-dibromorhodamine n-butyl ester (dye 3) are reported. These dyes were synthesized to promote a more efficient cancer cell photosensitizer for potential use in in vitro bone marrow purging in preparati...

journal_title：Photochemistry and photobiology

authors： Pal P,Zeng H,Durocher G,Girard D,Li T,Gupta AK,Giasson R,Blanchard L,Gaboury L,Balassy A,Turmel C,Laperrière A,Villeneuve L

更新日期：1996-02-01 00:00:00

abstract：:Haloarcula marismortui has been described to be nonmotile prior to the recent identification of flagellar filaments, suggesting the motile nature of H. marismortui. Here we observed the locomotion of freshly cultured H. marismortui cells and tracked the swimming trajectories via ImageJ. Trajectories of H. marismortui ...

journal_title：Photochemistry and photobiology

authors： Lin YC,Fu HY,Yang CS

更新日期：2010-09-01 00:00:00

abstract：:A polyclonal, multispecific antiserum was raised against a whole 3[(3-cholamidopropyl)-dimethylammonio]-1-propanesulfonate-extract of nonirradiated Blepharisma japonicum cells. It was used to reveal the composition of solutions that were hypothesized to contain the photoreceptor of the ciliate. A Bio-Gel A 1.5 m fine ...

journal_title：Photochemistry and photobiology

authors： Podestà A,Gioffré D,Grossi T,Montagnoli G

更新日期：2000-05-01 00:00:00

abstract：:alpha-Terthienyl photosensitizes single strand breaks in pBR322 DNA. Almost identical results were observed under oxygen and under argon. In the presence of oxygen, this DNA nicking was enhanced by histidine and was not affected by superoxide dismutase, catalase, or the antioxidant BHT. Although chemical damage to DNA...

journal_title：Photochemistry and photobiology

authors： Wang TP,Kagan J,Tuveson RW,Wang GR

更新日期：1991-04-01 00:00:00

abstract：:Structure-activity relationships have been widely reported for porphyrin and phthalocyanine photosensitizers, but not for phenothiazinium derivatives. Here, four phenothiazinium salts (methylene blue, toluidine blue O, 1,9-dimethyl methylene blue and the pentacyclic derivative DO15) were used to investigate how the ab...

journal_title：Photochemistry and photobiology

authors： Bacellar IO,Pavani C,Sales EM,Itri R,Wainwright M,Baptista MS

更新日期：2014-07-01 00:00:00

abstract：:Color variants of Ca2+ -regulated photoprotein obelin were shown to be an important tool for dual-analyte binding assay. To provide site-directed conjugation with biospecific molecules, several obelin color mutants carrying unique cysteine residues were obtained and characterized for their novel properties. A pair of ...

journal_title：Photochemistry and photobiology

authors： Krasitskaya VV,Burakova LP,Komarova AA,Bashmakova EE,Frank LA

更新日期：2017-03-01 00:00:00

abstract：:Experimental studies have recently demonstrated that fluorescence emission can be quenched by laser light pulses from modern high-repetition rate lasers, a phenomenon we call "light quenching." In this overview article, we describe the possible effects of light quenching on the steady-state and time-resolved intensity...

journal_title：Photochemistry and photobiology

authors： Lakowicz JR,Gryczyński I,Kuśba J,Bogdanov V

更新日期：1994-12-01 00:00:00

abstract：:The pyrimidine nucleobases contained in DNA undergo a variety of photoinduced reactions in which two moieties become joined to form a product (e.g. formation of cyclobutane dimers and [6-4] adducts). Herein, we describe a new type of photoconjugation reaction that has been shown to occur for 5-methylcytosine (5-MeC), ...

journal_title：Photochemistry and photobiology

authors： Shetlar MD,Chung J

更新日期：2012-03-01 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：:As a new class of sequence-specific regulators of gene expression, the microRNAs (miRNA) form a regulatory network with growth factors and transcription factors participating in various biological processes. It is now being recognized that the various key processes involved in cancer induction are under the control of...

journal_title：Photochemistry and photobiology

authors： Syed DN,Lall RK,Mukhtar H

更新日期：2015-01-01 00:00:00

abstract：:A key challenge for microbiology is to understand how evolution has shaped the wiring of regulatory networks. This is amplified by the paucity of information of power-spectra of physicochemical stimuli to which microorganisms are exposed. Future studies of genome evolution, driven by altered stimulus regimes, will the...

journal_title：Photochemistry and photobiology

authors： van der Steen JB,Hellingwerf KJ

更新日期：2015-09-01 00:00:00

abstract：:Topical 6,4,4'-trimethylangelicin (TMA) plus UVA was used to induce intense epidermal pigmentation in inbred HRA.HRII-c/+/Skh hairless pigmented mice over a 13 day period. Subsequent UVB/UVA exposure was used to assess the photoprotective properties of this tan using skin tumors as an endpoint. Comparisons were always...

journal_title：Photochemistry and photobiology

authors： Kipp C,Lewis EJ,Young AR

更新日期：1998-01-01 00:00:00

abstract：:This paper focuses on the estimation of the UV Index (UVI) for all sky conditions using a simple analytical parameterization involving three independent variables: the solar zenith angle, the total ozone column and the clearness index. Measurements of the UVI made at Badajoz and Cáceres (Southwestern Spain) from Janua...

journal_title：Photochemistry and photobiology

authors： Antón M,Serrano A,Cancillo ML,García JA,Madronich S

更新日期：2011-03-01 00:00:00

abstract：:A solution of iodouracil (0.2 mg/mL) and KI (0.1 M) in 0.23 M borate buffer (pH 7) forms triiodide upon exposure to UVB. In the presence of thyodene, the blue starch-iodine complex is formed, the intensity of which is proportional to the amount of UVB exposure. Studies were conducted using either a sunlamp or solar ir...

journal_title：Photochemistry and photobiology

authors： Rahn R,Lee MA

更新日期：1998-08-01 00:00:00

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：:Schinus terebinthifolius is a plant rich in phenolic compounds, which have antioxidant properties and can provide new opportunities for treatment and prevention of diseases mediated by ultraviolet radiation like photoaging and skin cancer. The aim of this study was to evaluate the photoprotective potential and ex vivo...

journal_title：Photochemistry and photobiology

authors： Bulla MK,Hernandes L,Baesso ML,Nogueira AC,Bento AC,Bortoluzzi BB,Serra LZ,Cortez DA

更新日期：2015-05-01 00:00:00

abstract：:The ciliate Stentor coeruleus exhibits photodispersal, that is, these cells swim away from light sources and collect in dimly lighted areas. We imaged and reconstructed the tracks of 48 Stentor to determine which swimming behaviors produced their photodispersal. We observed that their photodispersal is not due to a ch...

journal_title：Photochemistry and photobiology

authors： Menzies E,Das N,Wood DC

更新日期：2004-11-01 00:00:00