Oxygen dependence of hypericin-induced phototoxicity to EMT6 mouse mammary carcinoma cells.

abstract：:Comparative study of 13,15-[N-(2-hydroxyethyl)]cycloimide chlorin p6 (2), 13,15-(N-acetoxy)cycloimide chlorin p6 (3), 13,15-(N-hydroxy)cycloimide chlorin p6 methyl ester (4) and 13,15-(N-methoxy)cycloimide chlorin p6 methyl ester (5) together with the previously investigated 13,15-[N-(3-hydroxypropyl)]cycloimide chlor...

journal_title：Photochemistry and photobiology

authors： Feofanov A,Sharonov G,Grichine A,Karmakova T,Pljutinskaya A,Lebedeva V,Ruziyev R,Yakubovskaya R,Mironov A,Refregier M,Maurizot JC,Vigny P

更新日期：2004-02-01 00:00:00

abstract：:Room temperature phosphorescence (RTP) of three palladium (Pd)-phorphyrins in air-saturated solution of sodium deoxycholate (NaDC) aggregates was measured. RTP of Pd-meso-tetrakis (4-carboxyphenyl) porphyrin (Pd-TCPP) was obviously enhanced in NaDC-aggregates mediated by alkaline earth metal (AEM). Under the same expe...

journal_title：Photochemistry and photobiology

authors： Wang YT,Wang XW,Zhang Y

更新日期：2011-07-01 00:00:00

abstract：:By a technique which combines rapid mixing of cells and hematoporphyrin (HP) with a short duration of illumination, the photodynamic inactivation of yeast cells was investigated, particularly, in seeking for the information of the location of HP at the time of action. The fluence-survival curves obtained under the con...

journal_title：Photochemistry and photobiology

authors： Ito T

更新日期：1981-10-01 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：:Depletion of the ozone layer leads to increasing UV-B radiation on the earth's surface, which may affect weeds and their responses to herbicides. However, the effect of increased UV-B radiation on weeds and the interaction of weeds and herbicides are still obscure. The objective of this study was to compare glyphosate...

journal_title：Photochemistry and photobiology

authors： Yin L,Zhang M,Li Z,Duan L,Wang S

更新日期：2012-11-01 00:00:00

abstract：:The efficiency of ruthenium complexes for photosensitizing DNA damage depends on the oxidizing character of their ligands. Here we report on the difference in behavior of tris(2.2'-bipyrazyl)ruthenium(II) (Ru[bpz]3(2+)), tris(2,2'-bipyridyl)ruthenium(II) (Ru[bipy]3(2+)) and cis-dichlorobis (2,2'-bipyrazyl)ruthenium(II...

journal_title：Photochemistry and photobiology

authors： Vicendo P,Mouysset S,Paillous N

更新日期：1997-04-01 00:00:00

abstract：:Cumulative and intermittent sun exposure are risk factors for skin cancer, highlighting the need to monitor exposure during childhood. There is currently very little available information concerning the accuracy of self-reported levels of sun exposure, particularly for very young children. In this study, UV radiation ...

journal_title：Photochemistry and photobiology

authors： O'Riordan DL,Stanton WR,Eyeson-Annan M,Gies P,Roy C

更新日期：2000-01-01 00:00:00

abstract：:Singlet oxygen ((1)O(2)) is the most important cytotoxic agent in photodynamic therapy (PDT). The feasibility of using a chemiluminescence (CL) probe, 3,7-dihydro-6-[4-(2-(N'-(5-fluoresceinyl)thioureido)ethoxy)phenyl]-2-methylimidazo{1,2-a}pyrazin-3-one sodium salt (fluoresceinyl Cypridina luciferin analog, FCLA), to ...

journal_title：Photochemistry and photobiology

authors： Qin Y,Xing D,Luo S,Zhou J,Zhong X,Chen Q

更新日期：2005-11-01 00:00:00

abstract：:Identification of natural products capable of affording protection against UVB radiation-induced inflammatory responses and generation of oxidative stress may have important human health implications. The UVB exposure-induced skin injury and oxidative stress has been associated with a variety of skin disease condition...

journal_title：Photochemistry and photobiology

authors： Katiyar SK,Matsui MS,Elmets CA,Mukhtar H

更新日期：1999-02-01 00:00:00

abstract：:Photodynamic treatment is often thought to produce reactive oxygen species (ROS) that directly induce killing; the nomenclature and phrases revolve around such notions of light-dependency. Few studies reference the possible existence of oxidation products formed in secondary reactions, which bear cytotoxicity competit...

journal_title：Photochemistry and photobiology

authors： Chiemezie C,Greer A

更新日期：2019-01-01 00:00:00

abstract：:Paracoccidioidomycosis is the most prevalent human mycosis in Latin America. Cutaneous lesions are extremely painful and sensitive, and current treatment with antifungal drugs is lengthy and may cause side effects to patients. In this perspective, the helium-neon (HeNe) laser emerges as a novel therapy form due to its...

journal_title：Photochemistry and photobiology

authors： Nagib PR,Gameiro J,da Costa TA,Di Gangi R,Ribeiro Jda S,Paulino LC,Verinaud L

更新日期：2010-07-01 00:00:00

abstract：:We examined the influence of solar ultraviolet-B radiation (UV-B; 280-320 nm) on the growth, biomass production and phenylpropanoid concentrations of Deschampsia antarctica during the springtime ozone depletion season at Palmer Station, along the Antarctic Peninsula. Treatments involved placing filters on frames over ...

journal_title：Photochemistry and photobiology

authors： Ruhland CT,Xiong FS,Clark WD,Day TA

更新日期：2005-09-01 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 excited-state intramolecular H-atom transfer reactions of hypocrellins B and A are compared by using time-resolved absorption and fluorescence upconversion techniques. The hypocrellin B photophysics are well described by a simple model involving one ground-state species and excited-state forward and reverse H-atom...

journal_title：Photochemistry and photobiology

authors： Datta A,Smirnov AV,Wen J,Chumanov G,Petrich JW

更新日期：2000-02-01 00:00:00

abstract：:The mode of cell death following photodynamic therapy was investigated from the perspective of programmed cell death or apoptosis. Human prostate carcinoma cells (PC3), human non-small cell lung carcinoma (H322a) and rat mammary carcinoma (MTF7) were treated by photodynamic therapy. An examination of extracted cellula...

journal_title：Photochemistry and photobiology

authors： He XY,Sikes RA,Thomsen S,Chung LW,Jacques SL

更新日期：1994-04-01 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：:Although histochemical and immunohistochemical methods are the standard procedures in diagnosis of lymphoproliferative disorders, useful improvements in evidencing histopathologic manifestations can be obtained with the introduction of tissue autofluorescence analyses. We used microspectrofluorometry and a Multispectr...

journal_title：Photochemistry and photobiology

authors： Rigacci L,Alterini R,Bernabei PA,Ferrini PR,Agati G,Fusi F,Monici M

更新日期：2000-06-01 00:00:00

abstract：:Human carcinoma cells (NHIK 3025 cells) and Chinese hamster cells (V79 cells) were incubated with AlPcS1, AlPcS2 and AlPcS4, phthalocyanines with different lipophilicity but with similar photochemical properties when in monomeric solutions. The absorption- and fluorescence spectra of the dyes in the cells were recorde...

journal_title：Photochemistry and photobiology

authors： Moan J,Berg K,Bommer JC,Western A

更新日期：1992-08-01 00:00:00

abstract：:We report that exo- and endogenous guanosine 3',5'-cyclic monophosphate (cGMP) specifically influenced the photophobic response. In behavioral experiments the slowly hydrolyzable and membrane-permeable analogs of cGMP (8-bromo-cGMP [Br-cGMP] and N6,2'-o-dibutyryl-cGMP) dramatically prolonged the time for ciliary stop ...

journal_title：Photochemistry and photobiology

authors： Walerczyk M,Fabczak S

更新日期：2001-12-01 00:00:00

abstract：:The activity of the bimodal fluorescent protein (bmFP) (lambda max, 488 and 517 nm) in the in vitro luciferase reaction has been studied. The bmFP that is produced by Photobacterium phosphoreum strain bmFP is a dimer of two homologous subunits binding four riboflavin 5'-phosphate (FMN)-myristate chromophores. The addi...

journal_title：Photochemistry and photobiology

authors： Karatani H,Konaka T

更新日期：2000-02-01 00:00:00

abstract：:Pheophorbide a-induced photo-oxidation, in vitro, of cytochrome c oxidase and cytochrome c results in irreversible modifications to both protein components. Photo-oxidation of cytochrome c, as exhibited by change in its heme oxidation state, displays exponential kinetics and is detected with a lag period. Both the pho...

journal_title：Photochemistry and photobiology

authors： Chernomorsky S,Wong C,Poretz RD

更新日期：1992-02-01 00:00:00

abstract：:An alkyne-terminated anthracene and azide-terminated carbazole were joined through a copper-catalyzed cycloaddition to form a joined donor/acceptor pair. The photonic pair exhibited energy transfer when excited at the peak absorbance of carbazole and fluoresced with an anthracene spectral response. The fluorescent beh...

journal_title：Photochemistry and photobiology

authors： Daniele MA,Bandera YP,Foulger SH

更新日期：2012-01-01 00:00:00

abstract：:The photoluminescence (PL) of CdSe quantum dots (QD) in aqueous media has been studied in the presence of gold nanoparticles (NP) with different shapes. The steady state PL intensity of CdSe QD (1.5-2 nm in size) is quenched in the presence of gold NP. Picosecond bleach recovery and nanosecond time-resolved luminescen...

journal_title：Photochemistry and photobiology

authors： Nikoobakht B,Burda C,Braun M,Hun M,El-Sayed MA

更新日期：2002-06-01 00:00:00

abstract：:The interaction between human alpha1-acid glycoprotein (orosomucoid) and the fluorescent probe, 2-p-toluidinylnaphthalene-6-sulfonate (TNS) has been studied. An association constant of 16.7 (+/- 3) x 10(3) M-1 was obtained for the complex at 20 degrees C with a stoichiometry of 1:1. From the effect of temperature on t...

journal_title：Photochemistry and photobiology

authors： Albani J,Vos R,Willaert K,Engelborghs Y

更新日期：1995-07-01 00:00:00

abstract：:Pharmacological therapy is widely used in the treatment of muscle injuries. On the other hand, low-level laser therapy (LLLT) arises as a promising nonpharmacological treatment. The aim of this study was to analyze the effects of sodium diclofenac (topical application) and LLLT on morphological aspects and gene expres...

journal_title：Photochemistry and photobiology

authors： de Almeida P,Lopes-Martins RÁ,Tomazoni SS,Albuquerque-Pontes GM,Santos LA,Vanin AA,Frigo L,Vieira RP,Albertini R,de Carvalho Pde T,Leal-Junior EC

更新日期：2013-03-01 00:00:00

abstract：:The photophysical properties of Piroxicam, a nonsteroidal anti-inflammatory drug (NSAID), were investigated at different pHext values in reversed micelles of Aerosol-OT (AOT) in iso-octane, using both steady-state and picosecond time-resolved fluorescence spectroscopy. In contrast with the very complex data obtained i...

journal_title：Photochemistry and photobiology

authors： Andrade SM,Costa SM,Pansu R

更新日期：2000-04-01 00:00:00

abstract：:δ-Aminolevulinic acid (ALA)-induced porphyrin accumulation is widely used in the treatment of cancer, as photodynamic therapy. To clarify the mechanisms of the tumor-preferential accumulation of protoporphyrin, we examined the effect of the expression of heme-biosynthetic and -degradative enzymes on the ALA-induced ac...

journal_title：Photochemistry and photobiology

authors： Ohgari Y,Miyata Y,Miyagi T,Gotoh S,Ohta T,Kataoka T,Furuyama K,Taketani S

更新日期：2011-09-01 00:00:00

abstract：:The photochemistry of caged compounds of the o-nitrobenzyl type has been investigated thoroughly in the past. However, even recently new side reactions have been discovered. Earlier, we reported [Bley, F., K. Schaper, and H. Görner (2008), Photochem. Photobiol.84 162-171] that we found long-lived triplet states which ...

journal_title：Photochemistry and photobiology

authors： Schaper K,Etinski M,Fleig T

更新日期：2009-09-01 00:00:00

abstract：:In this study, water-soaked seeds of sunflower were exposed to He-Ne laser irradiation of different energies to determine whether or not He-Ne laser irradiation caused changes to seed thermodynamic and germination parameters as well as effects on the activities of germination enzymes. The experiment comprised four ene...

journal_title：Photochemistry and photobiology

authors： Perveen R,Ali Q,Ashraf M,Al-Qurainy F,Jamil Y,Raza Ahmad M

更新日期：2010-09-01 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