Photophysics of melatonin in different environments.

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 capacity of some linear and angular furocoumarins to induce DNA-protein cross-links by UVA (320-400 nm) irradiation has been evaluated in Chinese hamster ovary cells. Two linear furocoumarins, psoralen and 8-methoxypsoralen appeared to be capable of inducing DNA-protein cross-links to a noticeable extent. 4'-Methy...

journal_title：Photochemistry and photobiology

authors： Bordin F,Carlassare F,Busulini L,Baccichetti F

更新日期：1993-07-01 00:00:00

abstract：:The objective of the present study was to investigate the treatment of 9L gliosarcoma brain tumor in the rat with the combination of surgical resection and photodynamic therapy (PDT). Nude rats with intracranial 7-day-old 9L gliomas were randomly subjected to no treatment, PDT alone (Photofrin: 2 mg kg(-1), optical: 8...

journal_title：Photochemistry and photobiology

authors： Zhang X,Jiang F,Kalkanis SN,Yang H,Zhang Z,Katakowski M,Hong X,Zheng X,Chopp M

更新日期：2006-11-01 00:00:00

abstract：:Quantum yields of firefly bioluminescence reactions were determined for beetle luciferases from the three main families of luminous beetles emitting different bioluminescence colors. Quantum yield (QY) was significantly correlated with luminescence spectrum. The green light-emitting luciferase of the Brazilian click b...

journal_title：Photochemistry and photobiology

authors： Niwa K,Ichino Y,Kumata S,Nakajima Y,Hiraishi Y,Kato D,Viviani VR,Ohmiya Y

更新日期：2010-09-01 00:00:00

abstract：:Photodetection (PD) and photodynamic therapy (PDT) with 5-aminolevulinic acid (ALA)-induced protoporphyrin IX (PPIX) accumulation are approaches to detect and treat dysplasia and early cancer in the gastrointestinal tract and in the urinary bladder. Because ALA-induced PPIX production is limited, we synthesized ALA es...

journal_title：Photochemistry and photobiology

authors： Brunner H,Hausmann F,Knuechel R

更新日期：2003-11-01 00:00:00

abstract：:Although the first reactive oxygen species (ROS) formed during irradiation of photosensitized cells is almost invariably singlet molecular oxygen (1O2), other ROS have been implicated in the phototoxic effects of photodynamic therapy (PDT). Among these are superoxide anion radical (*O2(-)), hydrogen peroxide (H2O2) an...

journal_title：Photochemistry and photobiology

authors： Price M,Terlecky SR,Kessel D

更新日期：2009-11-01 00:00:00

abstract：:Photodynamic treatment of promyelocytic K562 cells in the presence of a monoglucosylporphyrin or hematoporphyrin leads to a sequence of events recognized as hallmarks of apoptosis: a drop in mitochondrial potential, concurrent with a drop in ATP level and a decrease in cell respiration, translocation of phosphatidylse...

journal_title：Photochemistry and photobiology

authors： Carré V,Jayat C,Granet R,Krausz P,Guilloton M

更新日期：1999-01-01 00:00:00

abstract：:It has previously been demonstrated that chronic low-dose solar-simulated UV radiation could induce both local and systemic immunosuppression as well as tolerance to a topically applied hapten. In this study, we have used a chronic low-dose UV-irradiation protocol to investigate the effects of UVA on the skin immune s...

journal_title：Photochemistry and photobiology

authors： Bestak R,Halliday GM

更新日期：1996-12-01 00:00:00

abstract：:Here, 10 guidelines are presented for a standardized definition of type I and type II photosensitized oxidation reactions. Because of varied notions of reactions mediated by photosensitizers, a checklist of recommendations is provided for their definitions. Type I and type II photoreactions are oxygen-dependent and in...

journal_title：Photochemistry and photobiology

authors： Baptista MS,Cadet J,Di Mascio P,Ghogare AA,Greer A,Hamblin MR,Lorente C,Nunez SC,Ribeiro MS,Thomas AH,Vignoni M,Yoshimura TM

更新日期：2017-07-01 00:00:00

abstract：:Several spectroscopic techniques (absorption, emission, transient absorption and differential scanning calorimetry--DSC) were used to investigate the deprotonation of dibucaine.HCl in a hydrophobic environment, and the interaction sites and mechanisms of the local anesthetic dibucaine.HCl on bacteriorhodopsin (bR) in ...

journal_title：Photochemistry and photobiology

authors： Lin CT,Chyan YG,Kresheck GC,Bitting HC Jr,el-Sayed MA

更新日期：1989-05-01 00:00:00

abstract：:Antisense oligodeoxynucleotides directed against a 24-mer RNA derived from the long terminal repeat (LTR) region of HIV were linked to proto- and methylpyrroporphyrin and their zinc derivatives. The oligonucleotide-porphyrin conjugates were tested for their ability to induce photodamage on the target RNA. Upon hybridi...

journal_title：Photochemistry and photobiology

authors： Mastruzzo L,Woisard A,Ma DD,Rizzarelli E,Favre A,Le Doan T

更新日期：1994-10-01 00:00:00

abstract：:To determine the impact of delivery vehicles in photosensitizing efficacy of HPPH, a hydrophobic photosensitizer was dissolved in various formulations: 1% Tween 80/5% dextrose, Pluronic P-123 and Pluronic F-127 in 0.5%, 1% and 2% phosphate buffer solutions (PBS). HPPH was also conjugated to Pluronic F-127, and the res...

journal_title：Photochemistry and photobiology

authors： Cacaccio J,Durrani F,Cheruku RR,Borah B,Ethirajan M,Tabaczynski W,Pera P,Missert JR,Pandey RK

更新日期：2020-05-01 00:00:00

abstract：:The biguanide metformin is widely used for the treatment of Type-II diabetes. Its antiproliferative and pro-apoptotic effects in various tumor cells suggest its potential candidacy for cancer chemoprevention. Herein, we report that metformin significantly inhibited human epidermoid A431 tumor xenograft growth in nu/nu...

journal_title：Photochemistry and photobiology

authors： Chaudhary SC,Kurundkar D,Elmets CA,Kopelovich L,Athar M

更新日期：2012-09-01 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：: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：: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：: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：: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：: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：:Herpes simplex virus (HSV) normally causes vescular lesions on mucocutaneous surfaces but can also cause encephalitis. The virus can reactivate from the latent state in neurons to form recrudescent lesions. One common stimulus for reactivation is exposure to sunlight. In the present study, the effects of irradiating r...

journal_title：Photochemistry and photobiology

authors： Garssen J,van der Molen R,de Klerk A,Norval M,van Loveren H

更新日期：2000-11-01 00:00:00

abstract：:The retina and retinal pigment epithelium contain a number of retinoids in a metabolic pathway that eventually forms the visual pigments. This study investigates the photochemistry of those retinoids that may contribute to light-induced damage to the retina. These include retinal (RAL), retinol (ROL), retinylpalmitate...

journal_title：Photochemistry and photobiology

authors： Dillon J,Gaillard ER,Bilski P,Chignell CF,Reszka KJ

更新日期：1996-05-01 00:00:00

abstract：:In this manuscript, we demonstrate the control of film thickness and surface wettability in the photochemical immobilization of poly (vinyl alcohol) (PVA) to a self-assembled monolayer (SAM) containing a phthalimide chromophore. Surface attachment is characterized by ellipsometry and contact angle measurements. The we...

journal_title：Photochemistry and photobiology

authors： Carroll GT,Turro NJ,Mammana A,Koberstein JT

更新日期：2017-10-01 00:00:00

abstract：:Patients infected with human immunodeficiency virus (HIV) have a high prevalence of UV radiation-responsive skin diseases including psoriasis, pruritus, eosinophilic folliculitis and eczemas. On the other hand, UV has been shown to suppress T cell-mediated immune responses and to induce activation and replication of H...

journal_title：Photochemistry and photobiology

authors： Adams ML,Houpt KR,Cruz PD Jr

更新日期：1996-08-01 00:00:00

abstract：:Reflectance spectrophotometry from 400 to 800 nm on different cutaneous pigmented lesions, including primary and metastatic malignant melanoma, pigmented nevi, lentigo and seborrhoeic keratosis, has been performed by using an external integrating sphere coupled to a spectrophotometer. Measurements show that reflectanc...

journal_title：Photochemistry and photobiology

authors： Marchesini R,Brambilla M,Clemente C,Maniezzo M,Sichirollo AE,Testori A,Venturoli DR,Cascinelli N

更新日期：1991-01-01 00:00:00

abstract：:The process of photoinduced hydroxylaminolysis has been re-examined in different bacteriorhodopsin (BR)-based media using O-substituted hydroxylamines, in particular, O-(4-nitrobenzyl) hydroxylamine hydrochloride (NBHA), O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine hydrochloride (FBHA) and O-(t-butyl) hydroxylamine h...

journal_title：Photochemistry and photobiology

authors： Dyukova TV,Druzhko AB

更新日期：2010-11-01 00:00:00

abstract：:In photodynamic therapy with topically applied delta-aminolevulinic acid porphyrins are acting as photosensitizers. The profile of porphyrin metabolites in normal or in neoplastic skin after administration of delta-aminolevulinic acid has not been determined in detail yet. Thus, to study porphyrin biosynthesis in huma...

journal_title：Photochemistry and photobiology

authors： Fritsch C,Batz J,Bolsen K,Schulte KW,Zumdick M,Ruzicka T,Goerz G

更新日期：1997-07-01 00:00:00

abstract：:Photodynamic therapy (PDT) with photosensitizer verteporfin is a clinically approved vascular disrupting modality that is currently in clinical trial for cancer treatment. In this study, we evaluated PDT in combination with either mTORC1 inhibitor rapamycin or mTORC1/C2 dual inhibitor AZD2014 for therapeutic enhanceme...

journal_title：Photochemistry and photobiology

authors： Kraus D,Palasuberniam P,Chen B

更新日期：2020-03-01 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

abstract：:Exposure of human skin to ultraviolet (UV) radiation causes significant damage to that tissue. The effects of UV on the skin mainly include acute inflammation (erythema/edema) and abnormal keratinization wherein prostaglandin E2 (produced by cyclooxygenase-2), interleukin-8 and transglutaminase 1 (a major regulatory f...

journal_title：Photochemistry and photobiology

authors： Imokawa G

更新日期：2019-03-01 00:00:00

abstract：:Cyamemazine (CMZ) is a neuroleptic drug that mediates cutaneous phototoxicity in humans. Here, the photobehavior of CMZ has been examined within α1 -acid glycoproteins, β- and γ-cyclodextrins and SDS micelles. In all these microenvironments, CMZ emission was enhanced and blue-shifted, and its lifetime was longer. Irra...

journal_title：Photochemistry and photobiology

authors： Limones-Herrero D,Pérez-Ruiz R,Jiménez MC,Miranda MA

更新日期：2014-09-01 00:00:00