Spectroscopic properties of fluorescein and rhodamine dyes attached to DNA.

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：:The recently discovered photo-activated adenylyl cyclase (mPAC from Microcoleus chthonoplastes) is the first PAC that owes a light-, oxygen- and voltage-sensitive (LOV) domain for blue-light sensing. The photoreaction of the mPAC receptor was studied by time-resolved UV/vis and light-induced Fourier transform infrared...

journal_title：Photochemistry and photobiology

authors： Kerruth S,Langner P,Raffelberg S,Gärtner W,Heberle J

更新日期：2017-05-01 00:00:00

abstract：:The protein environments surrounding the retinal tune electronic absorption maximum from 350 to 630 nm. Hybrid quantum mechanical/molecular mechanical (QM/MM) methods can be used in calculating excitation energies of retinal in its native protein environments and in studying the molecular basis of spectral tuning. We ...

journal_title：Photochemistry and photobiology

authors： Altun A,Yokoyama S,Morokuma K

更新日期：2008-07-01 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：:UV rays may cause several degrees of skin damage, which makes sunscreen research necessary. In addition, skin sensitivity shows daily variations, which can interfere in the detection of the efficacy of the filters. Here, we studied the UV-induced erythema in hairless rats at two times of the day (light and darkness) u...

journal_title：Photochemistry and photobiology

authors： Flo A,Calpena AC,Díez-Noguera A,Del Pozo A,Cambras T

更新日期：2017-03-01 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：: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：:Angelica archangelia (AA), a traditional herb, has attracted attention as an agent with potential for use in the prevention of chronic skin diseases. This study examined the photoprotective effects of AA on the inhibition of matrix metalloproteinases (MMPs) and collagen degradation in UVB-irradiated normal human derma...

journal_title：Photochemistry and photobiology

authors： Sun Z,Hwang E,Park SY,Zhang M,Gao W,Lin P,Yi TH

更新日期：2016-07-01 00:00:00

abstract：:The proteins induced by heat and other stressors, called heat shock proteins (HSP) or stress proteins, are considered to play a general role in protection from cellular injury. Exposure to UVA (320-400 nm) following application of 8-methoxypsoralen (8-MOP), termed PUVA is commonly used in the field of dermatology. In ...

journal_title：Photochemistry and photobiology

authors： Muramatsu T,Yamashina Y,Tada H,Kobayashi N,Yamaji M,Ohno H,Shirai T,Takahashi A,Ohnishi T

更新日期：1993-12-01 00:00:00

abstract：:The mechanism of caspase-3-dependent apoptosis induced by photodynamic therapy (PDT) of cultured Chinese hamster V79 cells with pheophorbide a (PPa) was investigated. The PPa-PDT induced rapid apoptosis within 30 min after irradiation of cells. This apoptosis was inhibited by the 1O2 quencher N3- and caspase-3 inhibit...

journal_title：Photochemistry and photobiology

authors： Inanami O,Yoshito A,Takahashi K,Hiraoka W,Kuwabara M

更新日期：1999-10-01 00:00:00

abstract：:Continuous red light controls starch degradation in turions of Spirodela polyrhiza [Dölger, K., U. K. Tirlapur and K.-J. Appenroth [1997] Photochem. Photobiol. 66, 126-127 (1997)]. This light could be replaced by repeated red light pulses with the reciprocity law fulfilled over a large range of fluence rates. The effe...

journal_title：Photochemistry and photobiology

authors： Appenroth KJ,Gabrys H

更新日期：2001-01-01 00:00:00

abstract：:This study investigated the effects of low-level laser therapy (LLLT) in the liver function, structure and inflammation in a experimental model of carbon tetrachloride (CCl(4))-induced liver cirrhosis. Wistar rats were divided into Control, LLLT, CCl(4) and CCl(4) +LLLT groups. CCl(4) groups received CCl(4) (0.4 g kg(...

journal_title：Photochemistry and photobiology

authors： Oliveira-Junior MC,Monteiro AS,Leal-Junior EC,Munin E,Osório RA,Ribeiro W,Vieira RP

更新日期：2013-01-01 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：:Intracellular targets for the photosensitizer alpha-terthienyl (alpha T) were examined by fluorescence microscopy and microfluorospectrometry using human nonkeratinized buccal cells. Intracellular distribution of alpha T was observed as fluorescent patches widely dispersed in the cytoplasm. The distribution of the flu...

journal_title：Photochemistry and photobiology

authors： Sasaki M,Koyama S,Tokiwa K,Fujita H

更新日期：1993-05-01 00:00:00

abstract：:Sapphyrins and a series of related porphyrinoid macrocycles have been investigated as potential agents for the treatment of leishmaniasis. The effectiveness of the compounds was evaluated in vitro upon incubation with Leishmania tarentolae or L. panamensis amastigotes and promastigotes. Their effectiveness was also as...

journal_title：Photochemistry and photobiology

authors： Hooker JD,Nguyen VH,Taylor VM,Cedeño DL,Lash TD,Jones MA,Robledo SM,Vélez ID

更新日期：2012-01-01 00:00:00

abstract：:This article is a highlight of the study by Stamenkovic and Hanelt in this issue of Photochemistry and Photobiology describing the high-irradiance photophysiology of several strains of freshwater chlorophyte microalgal genus, Cosmarium. These strains exhibit distinct differences in how combined thermal- high irradianc...

journal_title：Photochemistry and photobiology

authors： Neale P

更新日期：2013-07-01 00:00:00

abstract：:The kinetics of transients formed under photoexcitation of benzophenone (B) dissolved in three different polymers was studied by ns laser flash photolysis. These polymers were the soft rubbers poly (ethylene-co-butylene) (EB), polystyrene block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) and hard polystyrene ...

journal_title：Photochemistry and photobiology

authors： Levin PP,Efremkin AF,Sultimova NB,Kasparov VV,Khudyakov IV

更新日期：2014-03-01 00:00:00

abstract：:Near-infrared spectroscopy has been used to quantify the composition of healthy female breast tissue in vivo. By collecting transillumination spectra in the wavelength range 680-1100 nm at 7-9 positions on the breasts of five female volunteers, an attempt was made to quantify the intra- and intersubject variability of...

journal_title：Photochemistry and photobiology

authors： Quaresima V,Matcher SJ,Ferrari M

更新日期：1998-01-01 00:00:00

abstract：:A 24 h preculture of HT29-18 human colonic adenocarcinoma cells with the sterol synthesis inhibitor lovastatin at concentrations of 0.1-0.5 microM markedly increased the photocytotoxic effect of photofrin II delivered to cells by low density lipoproteins. Under the same conditions, LDL binding and photofrin II (PII) u...

journal_title：Photochemistry and photobiology

authors： Biade S,Mazière JC,Mora L,Santus R,Mazière C,Auclair M,Morlière P,Dubertret L

更新日期：1993-02-01 00:00:00

abstract：:The retinal pigment epithelium (RPE) is a highly metabolic layer of postmitotic cells lining Bruch's membrane in the retina. While these cells contain endogenous photosensitizers that mediate blue light-induced damage, it has also been shown that blue light exposure damages mitochondrial DNA in RPE cells resulting in ...

journal_title：Photochemistry and photobiology

authors： Yacout SM,Gaillard ER

更新日期：2017-03-01 00:00:00

abstract：:Two-photon laser scanning microscopy (TPLSM) of endogenous reduced nicotinamide adenine dinucleotide (NAD(P)H) provides important information regarding the cellular metabolic state. When imaging the punctate mitochondrial fluorescence originating from NAD(P)H in a rat basophilic leukemia (RBL) cell at low laser powers...

journal_title：Photochemistry and photobiology

authors： Nichols MG,Barth EE,Nichols JA

更新日期：2005-03-01 00:00:00

abstract：:A fluorescence titration method was applied for the determination of pKa of ciprofloxacin (CPX) in solution. Values of 6.18 +/- 0.05 and 8.76 +/- 0.03 were obtained for pKa1 and pKa2, respectively. The method was used to determine the ionization constants in the presence of liposomes of dipalmitoylphosphatidylcholine ...

journal_title：Photochemistry and photobiology

authors： Vázquez JL,Berlanga M,Merino S,Domènech O,Viñas M,Montero MT,Hernández-Borrell J

更新日期：2001-01-01 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 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：:In the present study, hypericin analogs with an increased hydrophilic character were synthesized. As chemical modifications alter the lipophilicity/hydrophilicity balance together with the photophysical/chemical background of the molecule the influence of these structural changes on the cellular uptake, retention and ...

journal_title：Photochemistry and photobiology

authors： Delaey EM,Obermuëller R,Zupkó I,De Vos D,Falk H,de Witte PA

更新日期：2001-08-01 00:00:00

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：: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：:Action spectroscopy has a long history and is of central importance to photobiological studies. Action spectra were among the first assays to point to chlorophyll as the molecule most responsible for plant growth and to DNA as the genetic material. It is useful to construct action spectra early in the investigation of...

journal_title：Photochemistry and photobiology

authors： Coohill TP

更新日期：1991-11-01 00:00:00

abstract：:During the maturation of red wines, the anthocyanins of grapes are transformed into pyranoanthocyanins, which possess a pyranoflavylium cation as their basic chromophore. Photophysical properties of the singlet and triplet excited states of a series of synthetic pyranoflavylium cations were determined at room temperat...

journal_title：Photochemistry and photobiology

authors： Silva GTM,Thomas SS,Silva CP,Schlothauer JC,Baptista MS,Freitas AA,Bohne C,Quina FH

更新日期：2019-01-01 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