Design and Synthesis of Coumarin-Imidazole Hybrid Chromophores: Solvatochromism, Acidochromism and Nonlinear Optical Properties.

abstract：:The potential for electron transfer quenching of rose bengal triplet (3RB2-) to compete with energy transfer quenching by oxygen was evaluated. Rate constants for oxidative and reductive quenching were measured in buffered aqueous solution, acetonitrile and in small unilamellar liposomes using laser flash photolysis. ...

journal_title：Photochemistry and photobiology

authors： Lambert CR,Kochevar IE

更新日期：1997-07-01 00:00:00

abstract：:UV-induced toxicity is characterized by marked oxidative stress, accompanied by the depletion of key cellular antioxidants, particularly glutathione (GSH). Replenishing cellular GSH may represent a means of counteracting UV-induced toxicity: however, treatment with free GSH is not therapeutically effective due to its ...

journal_title：Photochemistry and photobiology

authors： Wright D,Zampagni M,Evangelisti E,Conti S,D'Adamio G,Goti A,Becatti M,Fiorillo C,Taddei N,Cecchi C,Liguri G

更新日期：2013-03-01 00:00:00

abstract：:This article presents a facile method to prepare CdS/SiO(2) composite microspheres and their good catalytic properties. In our method, monodispersed SiO(2) particles bearing amino groups (-NH(2)) were synthesized at first and then used as carriers to load nanosized CdS particles to form CdS/SiO(2) composite microspher...

journal_title：Photochemistry and photobiology

authors： Peng C,Cheng X,Chen S,Li X,Li T,Zhang D,Huang Z,Zhang A

更新日期：2012-11-01 00:00:00

abstract：:The photodynamic therapy (PDT) activity of the bis(dimethylthexylsiloxy)silicon 2,3-naphthalocyanine (SiNc 8) was evaluated against the EMT-6 tumor implanted intradermally in BALB/c mice. The SiNc 8 was formulated in aqueous emulsions based on Cremophor EL or Solutol HS 15. The formulation was shown to affect plasma c...

journal_title：Photochemistry and photobiology

authors： Brasseur N,Ouellet R,Lewis K,Potter WR,van Lier JE

更新日期：1995-12-01 00:00:00

abstract：:Aminopyropheophorbide (APP) is a second generation of photosensitizer for photodynamic therapy (PDT). We demonstrated that APP strongly absorbed red light and, after being taken up by colon cancer cells (HCT-116 cells), was localized in cytoplasmic and internal membranes but not in mitochondria. The APP-mediated photo...

journal_title：Photochemistry and photobiology

authors： Matroule JY,Hellin AC,Morlière P,Fabiano AS,Santus R,Merville MP,Piette J

更新日期：1999-10-01 00:00:00

abstract：:The XPA gene-deficient mouse, an animal model of xeroderma pigmentosum (XP), develops enhanced photobiologic reactions including acute inflammation, immunosuppression and skin carcinogenesis, because of the defect in the excision repair of ultraviolet-induced DNA lesions. The results strongly suggest that nuclear DNA ...

journal_title：Photochemistry and photobiology

authors： Horio T,Miyauchi-Hashimoto H,Kuwamoto K,Yamazaki F,Okamoto H

更新日期：2007-01-01 00:00:00

abstract：:The intrinsic autofluorescence properties of biological tissues can be affected by the occurrence of histological and biochemical alterations induced by pathological processes. In this study the potential of autofluorescence to distinguish tumor from normal tissues was investigated with the view of a real-time diagnos...

journal_title：Photochemistry and photobiology

authors： Croce AC,Fiorani S,Locatelli D,Nano R,Ceroni M,Tancioni F,Giombelli E,Benericetti E,Bottiroli G

更新日期：2003-03-01 00:00:00

abstract：:We previously reported that Shewanella oneidensis MR-1 is extremely sensitive to natural solar radiation (NSR). Here we analyzed the global transcriptional profile of MR-1 during a 1-h recovering period after exposure to ambient solar light at a dose that yields about 20% survival rate on a Luria-Bertani (LB) plate. W...

journal_title：Photochemistry and photobiology

authors： Qiu X,Tiedje JM,Sundin GW

更新日期：2005-11-01 00:00:00

abstract：:The production of vitamin D3 is a pharmaceutically relevant process, producing high added-value products. Precursors are extracts from vegetal origin but bearing mainly an E geometry in the 5,6 double bond. The synthesis of vitamin D3 (5-E-α-calcidol) with the correct Z stereochemistry in the 5,6 double bond from the ...

journal_title：Photochemistry and photobiology

authors： Estruch GA,Aramendía PF

更新日期：2012-07-01 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：: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：:Under physiological conditions B-form DNA is an exceedingly stable structure. However, experimental evidences obtained through nuclear magnetic resonance and fluorescence anisotropy suggest that the structure of the double helix fluctuates substantially. We describe photoacoustic phase modulation frequency measurement...

journal_title：Photochemistry and photobiology

authors： Bugs MR,Cornélio ML

更新日期：2001-10-01 00:00:00

abstract：:Photo-Fries rearrangements of 4-dodecylphenyl phenylacetate have been investigated in polyethylene films with 0-71% crystallinity and in hexane over a range of temperatures. The results are compared to those reported previously from phenyl phenylacetate and 1-naphthyl tetradecanoate to assess the influence of a long a...

journal_title：Photochemistry and photobiology

authors： Luo C,Passin P,Weiss RG

更新日期：2006-01-01 00:00:00

abstract：:We have compared the distributions of two stable UV photoproducts in nucleosome core DNA at the single-nucleotide level using a T4 polymerase-exonuclease mapping procedure. The distribution of pyrimidine-pyrimidone (6-4) dimers was uncovered by reversing the major UV photo-product, cis-syn cyclobutane pyrimidine dimer...

journal_title：Photochemistry and photobiology

authors： Gale JM,Smerdon MJ

更新日期：1990-04-01 00:00:00

abstract：:Owing to the accessibility of skin to light, many applications of photodynamic treatment (PDT) have been developed within dermatology. The recent increase of dermatological antimicrobial PDT investigations is related to the growing problem of bacterial and fungal resistance to antibiotics. This review focuses on the s...

journal_title：Photochemistry and photobiology

authors： Smijs TG,Pavel S

更新日期：2011-01-01 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：:Effects of solvent, pH and hydrogen bonding with N-methylimidazole (MIm) on the photophysical properties of 1-hydroxyfluorenone (1HOF) have been studied. Fluorescence lifetime, fluorescence quantum yield and triplet yield measurements demonstrated that intersystem crossing was the dominant process in apolar media and ...

journal_title：Photochemistry and photobiology

authors： Sebok-Nagy K,Biczók L,Morimoto A,Shimada T,Inoue H

更新日期：2004-07-01 00:00:00

abstract：:When Escherichia coli cells were irradiated by UVA in the presence of 6-mercaptopurine (6-MP) or 2-thiouracil (S2Ura), two kinds of repair-deficient strains of recA- and uvrA- were killed more efficiently than the parental wild-type strain having normal repair capacities. In addition, these agents with UVA exposure gr...

journal_title：Photochemistry and photobiology

authors： Komeda K,Iwamoto S,Kominami S,Ohnishi T

更新日期：1997-01-01 00:00:00

abstract：:Polyenic systems are involved in light perception of numerous living organisms. Although a π-conjugated backbone is a common feature of all polyenes, their photophysics may vary. We provide a comparative quantum mechanical study of low-lying S1 and S2 excited states in short (3-5 double bonds) symmetric all-trans line...

journal_title：Photochemistry and photobiology

authors： Dokukina I,Marian CM,Weingart O

更新日期：2017-11-01 00:00:00

abstract：:Channel and pump rhodopsins use energy from light absorbed by a covalently bound retinal chromophore to transport ions across membranes of microbial cells. Ion transfer steps, including proton transfer, can couple to changes in protein conformational dynamics and water positions. Although general principles of how mic...

journal_title：Photochemistry and photobiology

authors： Bondar AN,Smith JC

更新日期：2017-11-01 00:00:00

abstract：:The cellular uptake of Photofrin II (PII) was studied using fluorescence imaging and chemical extraction. The influence of serum and low density lipoproteins (LDL) was examined under a variety of experimental conditions employing cultured human cells of different origins as well as a subcutaneously SMT-F tumor implant...

journal_title：Photochemistry and photobiology

authors： Korbelik M,Hung J,Lam S,Palcic B

更新日期：1990-02-01 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：:These experiments tested the hypothesis that phototropic bending arises when a light gradient across the stem differentially inhibits cell elongation because of direct inhibition of cell elongation by light (the Blaauw hypothesis). Continuous irradiation of dark-grown cucumber seedlings (Cucumis sativus L.) with unil...

journal_title：Photochemistry and photobiology

authors： Cosgrove DJ

更新日期：1985-01-01 00:00:00

abstract：:Exposure of cultured MRC5 human fibroblasts or NCTC 2544 human keratinocytes to mild doses of ultraviolet A (UVA: 320-400 nm) radiations markedly decreased the actin reactivity with fluorescein-labeled phalloidin. This indicates a change in the degree of polymerization of actin and thus in the organization of actin fi...

journal_title：Photochemistry and photobiology

authors： Djavaheri-Mergny M,Pieraggi MT,Mazière C,Santus R,Lageron A,Salvayre R,Dubertret L,Mazière JC

更新日期：1994-01-01 00:00:00

abstract：:Quantitative and qualitative changes in dermal collagen and elastin occur in response to chronic ultraviolet (UV) irradiation. These changes have been implicated in the genesis of the wrinkling seen in chronically irradiated, or photoaged skin. We examined the relationship between wrinkle formation and changes in derm...

journal_title：Photochemistry and photobiology

authors： Moloney SJ,Edmonds SH,Giddens LD,Learn DB

更新日期：1992-10-01 00:00:00

abstract：:The assessment model for ultraviolet radiation and risk "AMOUR" is applied to output from two chemistry-climate models (CCMs). Results from the UK Chemistry and Aerosols CCM are used to quantify the worldwide skin cancer risk avoided by the Montreal Protocol and its amendments: by the year 2030, two million cases of s...

journal_title：Photochemistry and photobiology

authors： van Dijk A,Slaper H,den Outer PN,Morgenstern O,Braesicke P,Pyle JA,Garny H,Stenke A,Dameris M,Kazantzidis A,Tourpali K,Bais AF

更新日期：2013-01-01 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：:We report here the design and synthesis of porphyrin-metallocene dyads consisting of a metallocene [either ferrocene or mixed sandwich η(5)-[C5H4(COOH)]Co(η(4)-C4Ph4) connected via an ester linkage at meso phenyl position of either free-base or zinc porphyrin. All these dyad systems were characterized by various spect...

journal_title：Photochemistry and photobiology

authors： Gokulnath S,Achary BS,Kumar CK,Trivedi R,Sridhar B,Giribabu L

更新日期：2015-01-01 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：:Light emitted by electronic photographic flash units is shown to damage bacteria and human skin fibroblasts deficient in repair systems, with survival curves very similar to those produced by 254 nm short UV. The lesions induced by these flashes are as photorepairable by the photolyase enzyme as those induced by 254 n...

journal_title：Photochemistry and photobiology

authors： Menezes S,Monteiro C

更新日期：1996-09-01 00:00:00