Is phototherapy safe for HIV-infected individuals?

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 significance of human cutaneous pigmentation lies in its protective role against sun-induced DNA damage and photocarcinogenesis. Fair skin and red hair are characterized by a low eumelanin to pheomelanin ratio, and have been associated with increased risk of skin cancer. Cutaneous pigmentation is a complex genetic...

journal_title：Photochemistry and photobiology

authors： Dessinioti C,Antoniou C,Katsambas A,Stratigos AJ

更新日期：2011-09-01 00:00:00

abstract：:We have previously demonstrated the ability of UVC (254 nm) radiation to induce asynchronous polyoma replication in rat fibroblast cells (H3 line) that contain an integrated copy of polyoma virus. In the present study we show that general purpose lamps can induce polyoma replication in these cells as well. The amount ...

journal_title：Photochemistry and photobiology

authors： Rutberg SE,Ronai Z

更新日期：1993-08-01 00:00:00

abstract：:A portable fluorimeter was developed and utilized to acquire fluorescence spectra from 381 cervical sites in 95 patients at 337, 380 and 460 nm excitation immediately prior to colposcopy. A multivariate statistical algorithm was used to extract clinically useful information from tissue spectra acquired in vivo. Two fu...

journal_title：Photochemistry and photobiology

authors： Ramanujam N,Mitchell MF,Mahadevan-Jansen A,Thomsen SL,Staerkel G,Malpica A,Wright T,Atkinson N,Richards-Kortum R

更新日期：1996-10-01 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：:Confocal laser microspectrofluorometric measurements on human T47D mammary tumor cells have been performed to assess the intracellular distribution of hypericin within the various cell compartments: cytoplasmic membrane, cytoplasm and nucleus. Confocal fluorescence measurements obtained from microvolumes (approximatel...

journal_title：Photochemistry and photobiology

authors： Miskovsky P,Sureau F,Chinsky L,Turpin PY

更新日期：1995-09-01 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：: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：:Photodynamic therapy (PDT) is an established therapeutic modality that uses nonionizing near-infrared light to activate photocytotoxicity of endogenous or exogenous photosensitizers (PSs). An ongoing avenue of cancer research involves leveraging PDT to stimulate antitumor immune responses; however, these effects appea...

journal_title：Photochemistry and photobiology

authors： Kercher EM,Nath S,Rizvi I,Spring BQ

更新日期：2020-03-01 00:00:00

abstract：:We present the detailed characterization on the reconstitution of two cyclic tetrapyrrole pigments that have the same substituents but differ in the degree of hydrogenation in the macrocycles from bacteriochlorophyll (BChl) a (7,8,17,18-tetrahydroporphyrin) into the binding sites of B800 BChl a in light-harvesting com...

journal_title：Photochemistry and photobiology

authors： Saga Y,Miyagi K

更新日期：2018-07-01 00:00:00

abstract：:The photodynamic effect of hypericin on EMT6 mouse mammary carcinoma cells was investigated in vitro under aerobic and hypoxic conditions. Under aerobic conditions, hypericin-induced photocytotoxicity was dose dependent within a 1-50 microM range. Under hypoxic conditions, cells were resistant to hypericin-induced pho...

journal_title：Photochemistry and photobiology

authors： Thomas C,Pardini RS

更新日期：1992-06-01 00:00:00

abstract：:The reactions of polyuridylic acid [poly(U)] with Ru(bpy)3(3+) [Ru(III)] and SO4.-, following UV and visible light irradiation of Ru(bpy)3(2+) [Ru(II)] in the presence of S2O8(2-), were studied in an argon-saturated aqueous solution using time-resolved absorption and conductivity methods. The kinetics of the Ru(III) c...

journal_title：Photochemistry and photobiology

authors： Tossi AB,Görner H,Schulte-Frohlinde D

更新日期：1989-11-01 00:00:00

abstract：:Efficacy of ionizing radiation (I/R) was compared with phototoxic effects of photodynamic therapy (PDT) in vitro using two cell lines derived from patients with head and neck squamous cell carcinoma (HNSCC). A cell line derived from a donor with a human papilloma virus (HPV) infection was more responsive to I/R but si...

journal_title：Photochemistry and photobiology

authors： Kessel D,Cho WJ,Rakowski J,Kim HE,Kim HC

更新日期：2020-05-01 00:00:00

abstract：:The thermodynamics of binding of Me-alpha(-GalNAc, Gal-beta-1-3GalNAc-alpha-O-Me (T-antigen-alpha), Gal-beta-1-3GalNAc and Gal-alpha-1-6Glc (mellibiose) to Artocarpus hirsuta lectin was studied using fluorescence spectroscopy. The binding affinities of the saccharides are in the order Gal-beta-1-3GalNAc-alpha-O-Me > M...

journal_title：Photochemistry and photobiology

authors： Gaikwad SM,Khan MI

更新日期：2006-09-01 00:00:00

abstract：:Urinary cytology is a noninvasive and unconstraining technique for urothelial cancer diagnosis but lacks sensitivity for detecting low-grade lesions. In this study, the fluorescence properties of classical Papanicolaou-stained urothelial cytological slides from patients or from cell lines were monitored to investigate...

journal_title：Photochemistry and photobiology

authors： Steenkeste K,Lécart S,Deniset A,Pernot P,Eschwège P,Ferlicot S,Lévêque-Fort S,Briandet R,Fontaine-Aupart MP

更新日期：2007-09-01 00:00:00

abstract：:The present work is aimed to synthesize CdTe/ZnSe core/shell quantum dots (QDs) in an easy way and to explore the possibilities of its application in in vitro imaging of chicken tissue and embryo. The QDs were prepared using microwave irradiation with different temperatures, which is a very easy and less time-consumin...

journal_title：Photochemistry and photobiology

authors： Moulick A,Blazkova I,Milosavljevic V,Fohlerova Z,Hubalek J,Kopel P,Vaculovicova M,Adam V,Kizek R

更新日期：2015-03-01 00:00:00

abstract：:Photolysis of 6-chloro-1,3-dimethyluracil and mesitylene in the presence of trifluoroacetic acid (TFA) at low temperature gave 1,3,5,7,9- and 1,3,6,8,10-pentamethylcyclooctapyrimidine-2,4-diones (1b, 1c). Sequential photoreaction of the former (1b) resulted in the formation of 9,11-diazapentacyclo[6.4.0.0(1,3).0(2,5)....

journal_title：Photochemistry and photobiology

authors： Ohkura K,Nishijima K,Seki K

更新日期：2001-09-01 00:00:00

abstract：:The multifunctional polypeptide cyclosporin synthetase (CySyn) remains one of the most complex nonribosomal peptide synthetase described. In this study we used a highly specific photoaffinity labeling procedure with the natural cofactor S-adenosyl-L-methionine (AdoMet), 14C-isotopically labeled at the Sdelta methyl gr...

journal_title：Photochemistry and photobiology

authors： Velkov T,Lawen A

更新日期：2003-02-01 00:00:00

abstract：:Muscle injuries represent ca 30% of sports injuries and excessive stretching of muscle causes more than 90% of injuries. Currently the most used treatments are nonsteroidal anti-inflammatory drugs (NSAIDs), however, in last years, low-level laser therapy (LLLT) is becoming an interesting therapeutic modality. The aim ...

journal_title：Photochemistry and photobiology

authors： de Paiva Carvalho RL,Leal-Junior EC,Petrellis MC,Marcos RL,de Carvalho MH,De Nucci G,Lopes-Martins RA

更新日期：2013-03-01 00:00:00

abstract：:We used GHz frequency-domain fluorometry to investigate the time-dependent intensity decays of N-acetyl-L-trytophanamide (NATA) when collisionally quenched by acrylamide in propylene glycol at 20 degrees C. The intensity decays of NATA became increasingly heterogeneous in the presence of acrylamide. The NATA intensity...

journal_title：Photochemistry and photobiology

authors： Lakowicz JR,Zelent B,Gryczynski I,Kuśba J,Johnson ML

更新日期：1994-09-01 00:00:00

abstract：:Chronic exposure of the gray, short-tailed oppossum, Monodelphis domestica to ultraviolet radiation (UVR) induces mesenchymal tumors of the cornea. High molecular weight DNA samples from 6 UVR-induced corneal tumors were assayed for their ability to transform NIH 3T3 cells to tumorigenicity. NIH 3T3 cells transfected ...

journal_title：Photochemistry and photobiology

authors： Sabourin CL,Freeman AG,Kusewitt DF,Ley RD

更新日期：1992-03-01 00:00:00

abstract：:Porous ZnS and ZnO nano-crystal films were fabricated via a three-step procedure. First, Zn(CH3 COO)2 /Silk Fibroin nanofiber mats were prepared by coaxial electrospinning. Second, Zn(CH3 COO)2 /Silk Fibroin mats were immersed in NaS solution to react with S2- to obtain ZnS/Silk Fibroin nanofiber mats. Finally, ZnO po...

journal_title：Photochemistry and photobiology

authors： Wang H,Liang L,Cheng X,Luo Y,Sun S

更新日期：2018-01-01 00:00:00

abstract：:Leaf discs, enclosed in a photoacoustic (PA) chamber, generate two types of PA gas-uptake signals under certain conditions. Type I is manifested by a severe signal decrease that develops slowly under very low-light intensity and often reaches negative values. It is partially reversed by low-intensity far-red light. Ty...

journal_title：Photochemistry and photobiology

authors： Malkin S,Havaux M

更新日期：2001-10-01 00:00:00

abstract：:The photophysical parameters for the photosensitizer Pd(II) meso-Tetra(4-carboxyphenyl) porphine (PdT790) acquired in a previous study were incorporated into the PDT oxygen diffusion models for cell suspensions and cell monolayers. The time-dependent phosphorescence signals generated by the diffusion models are shown ...

journal_title：Photochemistry and photobiology

authors： Weston MA,Patterson MS

更新日期：2014-11-01 00:00:00

abstract：:Magnetic field effect studies of alkylcobalamin photolysis provide evidence for the formation of a reactive radical pair that is born in the singlet spin state. The radical pair recombination process that is responsible for the magnetic field dependence of the continuous-wave (CW) quantum yield is limited to the diffu...

journal_title：Photochemistry and photobiology

authors： Natarajan E,Grissom CB

更新日期：1996-08-01 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：:It has been proposed that photodegradation of folates may be the reason for the pigmentation of races living under high fluence rates of ultraviolet radiation. The photodegradation of folic acid (FA) induced by ultraviolet-A (UV-A) radiation, in solution and in the presence of human serum albumin (HSA), was studied wi...

journal_title：Photochemistry and photobiology

authors： Vorobey P,Steindal AE,Off MK,Vorobey A,Moan J

更新日期：2006-05-01 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：:In recent years the class of known fluorescent proteins (FPs) has dramatically expanded as an ever-increasing numbers of variants and homologs of the green fluorescent protein (GFP) from Aequorea jellyfish have been either engineered in the lab or discovered in other marine organisms. The red fluorescent protein (RFP)...

journal_title：Photochemistry and photobiology

authors： Li Y,Sierra AM,Ai HW,Campbell RE

更新日期：2008-01-01 00:00:00

abstract：:Ring-fused retinal analogs were designed to examine the hula-twist mode of the photoisomerization of the 9-cis retinylidene chromophore. Two 9-cis retinal analogs, the C11-C13 five-membered ring-fused and the C12-C14 five-membered ring-fused retinal derivatives, formed the pigments with opsin. The C11-C13 ring-fused a...

journal_title：Photochemistry and photobiology

authors： Hirano T,Lim IT,Kim DM,Zheng XG,Yoshihara K,Oyama Y,Imai H,Shichida Y,Ishiguro M

更新日期：2002-12-01 00:00:00