Photophysical properties of 2-nitro-5,10,15,20-tetra-p-tolylporphyrins.

abstract：:The photosolvolysis of several biphenyl methanols (Ph-PhCH[Ph]OH) substituted with hydroxy or methoxy groups on the benzene ring not containing the -CH(Ph)OH moiety has been studied in aqueous solution. This work is a continuation of our studies of photosolvolysis of hydroxy-substituted arylmethanols that generate qui...

journal_title：Photochemistry and photobiology

authors： Xu M,Lukeman M,Wan P

更新日期：2006-01-01 00:00:00

abstract：:Seafarers working on decks of vessels at low latitudes are exposed to extremely high solar UV radiation. Their risk of developing skin cancer may be enhanced. Solar erythemal UV irradiance and exposure were measured for the first time on merchant vessels going along typical international routes at low latitudes. The m...

journal_title：Photochemistry and photobiology

authors： Feister U,Meyer G,Kirst U

更新日期：2013-11-01 00:00:00

abstract：:This study compares the abilities of the glutathione (GSH) and thioredoxin (Trx) antioxidant systems in defending cultured human lens epithelial cells (LECs) against UVA light. Levels of GSH were depleted with either L-buthionine-(S,R)-sulfoximine (BSO) or 1-chloro-2,4-dinitrobenzene (CDNB). CDNB treatment also inhibi...

journal_title：Photochemistry and photobiology

authors： Padgaonkar VA,Leverenz VR,Bhat AV,Pelliccia SE,Giblin FJ

更新日期：2015-03-01 00:00:00

abstract：:Solar light leads to thymine dimers that are mutagenic and primary cause of skin cancer. Here, we report absorption and synchrotron radiation circular dichroism (CD) spectra of Tn single strands with different number n of bases (n = 2-7, 10, 11) recorded after various 254 nm irradiation times. From a principal compone...

journal_title：Photochemistry and photobiology

authors： Baggesen LM,Hoffmann SV,Nielsen SB

更新日期：2014-01-01 00:00:00

abstract：:UVR8 is the only known plant photoreceptor that mediates light responses to UV-B (280-315 nm) of the solar spectrum. UVR8 perceives a UV-B signal via light-induced dimer dissociation, which triggers a wide range of cellular responses involved in photomorphogenesis and photoprotection. Two recent crystal structures of ...

journal_title：Photochemistry and photobiology

authors： Yang X,Montano S,Ren Z

更新日期：2015-09-01 00:00:00

abstract：:Fluoresceinyl cypridina luciferin analog (FCLA) is a chemiluminescence (CL) probe for detecting reactive oxygen species (ROS). Its efficiency for detecting singlet oxygen (1O2) can be significantly enhanced in the presence of human serum albumin (HSA). This phenomenon may apply to important applications for both resea...

journal_title：Photochemistry and photobiology

authors： Zhou J,Xing D,Chen Q

更新日期：2006-07-01 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：:The photostability of drugs administered topically on unprotected skin is a complex phenomenon that could be connected with the loss of activity or, rather rarely, the occurrence of toxic degradation products. In this study, an in-depth investigation of the photostability of terbinafine, in both solutions and formulat...

journal_title：Photochemistry and photobiology

authors： Kryczyk-Poprawa A,Żmudzki P,Koczurkiewicz P,Pękala E,Hubicka U

更新日期：2019-07-01 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：: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：:Photosensitizer-functionalized reduced graphene oxide (rGO) nanoparticles are promising materials for photodynamic therapy in cancer management. In this study, rGO is synthesized by a green route employing glucose as the reducing agent and functionalized with photosensitizer, protoporphyrin IX (PPIX) in a convenient, ...

journal_title：Photochemistry and photobiology

authors： Shuvra Smita S,Das A,Barui A

更新日期：2020-11-01 00:00:00

abstract：:The ultraviolet (UV) component of solar radiation is the driving force of life on earth, but it can cause photoaging and skin cancer. In this study, we investigated the effects of the glucosamine-derivative 2-(N-Acetyl)-L-phenylalanylamido-2-deoxy-β-D-glucose (NAPA) on human primary fibroblasts (FBs) stimulated in vit...

journal_title：Photochemistry and photobiology

authors： Lopreiato M,Cocchiola R,Falcucci S,Leopizzi M,Cardone M,Di Maio V,Brocco U,D'Orazi V,Calvieri S,Scandurra R,De Marco F,Scotto d'Abusco A

更新日期：2020-01-01 00:00:00

abstract：:Photocatalytic degradation of methyl orange (MO) as a model of an organic pollution was accomplished with magnetic and porous TiO(2)/ZnO/Fe(3)O(4)/PANI and ZnO/Fe(3)O(4)/PANI nanocomposites under visible light irradiation. The structures of nanocomposites were characterized by various techniques including UV-Vis absor...

journal_title：Photochemistry and photobiology

authors： Nabid MR,Sedghi R,Gholami S,Oskooie HA,Heravi MM

更新日期：2013-01-01 00:00:00

abstract：:This research examines the behavior of ground-level solar UV radiation as measured by eight broadband meters in the continental United States during the period from late 1994 to late 1998. The goal is to define the variability that occurs in UV irradiance over time scales ranging from one to several years. The monthly...

journal_title：Photochemistry and photobiology

authors： Frederick JE,Slusser JR,Bigelow DS

更新日期：2000-10-01 00:00:00

abstract：:Photoreduction of cytochrome c (Cyt c) has been reinvestigated using femtosecond-to-nanosecond transient absorption and stationary spectroscopy. Femtosecond spectra of oxidized Cyt c, recorded in the probe range 270-1000 nm, demonstrate similar evolution upon 266 or 403 nm excitation: an ultrafast 0.3 ps internal conv...

journal_title：Photochemistry and photobiology

authors： Löwenich D,Kleinermanns K,Karunakaran V,Kovalenko SA

更新日期：2008-01-01 00:00:00

abstract：:Eumelanin (brown/black melanin) and pheomelanin (red/yellow melanin) in human hair can be quantified using chemical methods or approximated using spectrophotometric methods. Chemical methods consume greater resources, making them less attractive for epidemiological studies. This investigation sought to identify the sp...

journal_title：Photochemistry and photobiology

authors： Shekar SN,Duffy DL,Frudakis T,Montgomery GW,James MR,Sturm RA,Martin NG

更新日期：2008-05-01 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：:This paper analyzes the influence of infrared radiation (IR) on regeneration, after autotomy of limb buds of Neohelice granulata and consequently the time molt. Eyestalks were ablated to synchronize the start of molt. Afterward, animals were autotomized of five pereopods and divided into control and irradiated groups....

journal_title：Photochemistry and photobiology

authors： Gonzalez VC,Lena AB,Espindola WA,de Souza Votto AP,Jorge MB,de Moraes Vaz Batista Filgueira D,Bianchini A,Sérgio Varela Júnior A,Nery LE,Trindade GS

更新日期：2009-09-01 00:00:00

abstract：:In current clinical practice, photodynamic therapy (PDT) is carried out with prescribed drug doses and light doses as well as fixed drug-light intervals and illumination fluence rates. This approach can result in undesirable treatment outcomes of either overtreatment or undertreatment because of biological variations ...

journal_title：Photochemistry and photobiology

authors： Zeng H,Korbelik M,McLean DI,MacAulay C,Lui H

更新日期：2002-04-01 00:00:00

abstract：:People can get oral cancers from UV (290-400 nm) exposures. Besides high outdoor UV exposures, high indoor UV exposures to oral tissues can occur when consumers use UV-emitting tanning devices to either tan or whiten their teeth. We compared the carcinogenic risks of skin to oral tissue cells after UVB (290-320 nm) ex...

journal_title：Photochemistry and photobiology

authors： Breger J,Baeva L,Agrawal A,Shindell E,Godar DE

更新日期：2013-05-01 00:00:00

abstract：:The photodegradation of the S(+)- and R(-)-ketoprofen (KP) enantiomers in the bovine serum albumin matrix was studied by steady-state photolysis with the use of lambda(irr) > 320 nm and transient absorption spectroscopy with lambda(exc) = 355 nm, at 1/1 and 2/1 KP/BSA molar ratios. R(-)-KP was found to be more labile ...

journal_title：Photochemistry and photobiology

authors： Monti S,Manet I,Manoli F,Morrone R,Nicolosi G,Sortino S

更新日期：2006-01-01 00:00:00

abstract：:This review focuses on damage photosensitized by the fluoroquinolone (FQ) antibacterial drugs. Different models are employed to study biosubstrate photodamage mediated by FQs (organisms, cells, isolated biomolecules and super molecules). Being that the effect of environment (polarity of the medium, ions, pH, binding w...

journal_title：Photochemistry and photobiology

authors： de Guidi G,Bracchitta G,Catalfo A

更新日期：2011-11-01 00:00:00

abstract：:Photodynamic therapy (PDT) is frequently accompanied by induction of systemic immunosuppression. Photochemical mechanisms underlying this effect are not completely understood. Here, we demonstrate the immunosuppressive activity of photooxidation products of protoporphyrin IX dimethyl ester (PPIX) in a murine model of ...

journal_title：Photochemistry and photobiology

authors： Kyagova AA,Mansurova GV,Kozir LA,Ponomarev GV,Pavlov VY,Konstantinov IO,Potapenko AY

更新日期：2005-11-01 00:00:00

abstract：:Exploration of environmental dynamics using intrinsic biological probe tryptophan is very important; however, it suffers from various difficulties. An alternative probe, kynurenine (KN), has been found to be an efficient probe for the ultrafast dynamics in the biological environment (Goswami et al., [2010] J. Phys. Ch...

journal_title：Photochemistry and photobiology

authors： Rakshit S,Goswami N,Pal SK

更新日期：2012-01-01 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：: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：:Reactive nitrogen species, produced during the process of inflammation induced by various factors including UV radiation, modify amino acids in crucial proteins. It is assumed that skin tissue is more likely to be modified, as it is located at the outer layer of a body that is exposed to UV radiation on a daily basis....

journal_title：Photochemistry and photobiology

authors： Ishitsuka Y,Maniwa F,Koide C,Douzaki N,Kato Y,Nakamura Y,Osawa T

更新日期：2007-05-01 00:00:00

abstract：:Phototherapy with broadband UVB is an effective treatment for inflammatory dermatoses. A newly developed fluorescent UVB lamp (Philips TL01) that emits a narrowband UVB around 311 nm was shown to be superior for the phototherapy of psoriasis. In order to contribute to the knowledge about the carcinogenic potential of ...

journal_title：Photochemistry and photobiology

authors： Tzung TY,Rünger TM

更新日期：1998-06-01 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：:Four chemical preservatives commonly used in ophthalmic solutions were tested for their toxic and mutagenic potential in mouse lymphoma cells with and without exposure of the cells to ultraviolet A (UVA) radiation. The preservatives tested were benzalkonium chloride (BAK), chlorhexidine, thimerosal and ethylenediamine...

journal_title：Photochemistry and photobiology

authors： Withrow TJ,Brown NT,Hitchins VM,Strickland AG

更新日期：1989-09-01 00:00:00