Antimicrobial photodynamic therapy and photodynamic inactivation, or killing bugs with dyes and light--a symposium-in-print.

abstract：:Low-power lasers are commonly used in human medicine for treatment of various pathological conditions, but mechanisms of their healing effects are still poorly understood. The results of this study provide information related to these effects at the cellular level. Two different protozoan species, Euglena gracilis and...

journal_title：Photochemistry and photobiology

authors： Koutna M,Janisch R,Unucka M,Svobodnik A,Mornstein V

更新日期：2004-11-01 00:00:00

abstract：:A structural subunit (called B816) has been isolated from the B875 light-harvesting complex of Rhodobacter capsulatus using a detergent-mediated dissociation of chromatophores. Rb. capsulatus MW442 (B800-850- B875+ car+) chromatophores were extracted with benzene and titrated with octyl glucoside (OG) to shift the nea...

journal_title：Photochemistry and photobiology

authors： Heller BA,Loach PA

更新日期：1990-05-01 00:00:00

abstract：:A model of UV-induced DNA damage in oceanic bacterioplankton was developed and tested against previously published and novel measurements of cyclobutane pyrimidine dimers (CPD) in surface layers of the ocean. The model describes the effects of solar irradiance, wind-forced mixing of bacterioplankton and optical proper...

journal_title：Photochemistry and photobiology

authors： Huot Y,Jeffrey WH,Davis RF,Cullen JJ

更新日期：2000-07-01 00:00:00

abstract：:We have demonstrated that it is possible to launch UVC LED light into bacterial contaminated polymer tubes/catheters and disinfect the intraluminal space of these tubes. This can be achieved by UVC treatment of the catheters on a regular basis. Catheters are in the distal end equipped with an exit hole for administrat...

journal_title：Photochemistry and photobiology

authors： Bak J,Jørgensen TM,Helfmann J,Gravemann U,Vorontsova I

更新日期：2011-03-01 00:00:00

abstract：:More scheduled outdoor stay is increasingly advocated for school children. This study measured 2(nd) , 5(th) and 8(th) graders' erythemal UV-exposure in September, March and May at four Swedish schools. We related those exposures, as fractions of total available ambient radiation, to the schools outdoor environments d...

journal_title：Photochemistry and photobiology

authors： Pagels P,Wester U,Söderström M,Lindelöf B,Boldemann C

更新日期：2016-01-01 00:00:00

abstract：:The protein environments surrounding the retinal tune electronic absorption maximum from 350 to 630 nm. Hybrid quantum mechanical/molecular mechanical (QM/MM) methods can be used in calculating excitation energies of retinal in its native protein environments and in studying the molecular basis of spectral tuning. We ...

journal_title：Photochemistry and photobiology

authors： Altun A,Yokoyama S,Morokuma K

更新日期：2008-07-01 00:00:00

abstract：:We have studied the damage of alcohol dehydrogenase (ADH) and glyceraldehyde 3-phosphate dehydrogenase (GAPD) induced by Fe++/EDTA + H2O2 in combination with UV-A (main output at 365 nm). Enzyme inactivation, formation of hydroxyl radicals (measured in the absence of enzymes), increase in protein carbonyls, oxidation ...

journal_title：Photochemistry and photobiology

authors： Hu ML,Tappel AL

更新日期：1992-09-01 00:00:00

abstract：:Continuous red light controls starch degradation in turions of Spirodela polyrhiza [Dölger, K., U. K. Tirlapur and K.-J. Appenroth [1997] Photochem. Photobiol. 66, 126-127 (1997)]. This light could be replaced by repeated red light pulses with the reciprocity law fulfilled over a large range of fluence rates. The effe...

journal_title：Photochemistry and photobiology

authors： Appenroth KJ,Gabrys H

更新日期：2001-01-01 00:00:00

abstract：:We previously reported that a low level of lysosomal photodamage potentiated the phototoxic effect of subsequent mitochondrial photodamage mediated by the benzoporphyrin derivative (BPD) in murine hepatoma 1c1c7 cells. This was attributed to release of Ca2+ from damaged lysosomes and a calpain-mediated conversion of t...

journal_title：Photochemistry and photobiology

authors： Kessel D,Reiners JJ Jr

更新日期：2017-11-01 00:00:00

abstract：:Types of photoreceptor cells in the retinas of 36 species of vertebrates (5 classes, 14 orders) were investigated immunocytochemically with monoclonal antibodies against chicken iodopsin (Io-mAb) and antiserum against bovine rhodopsin (Rh-As). In mammals, Rh-As labeled the outer segments of some photoreceptor cells in...

journal_title：Photochemistry and photobiology

authors： Kawata A,Oishi T,Fukada Y,Shichida Y,Yoshizawa T

更新日期：1992-12-01 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 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：:We studied the spectral characteristics of the larvae of three sympatric Belgian species of fireflies, Lampyris noctiluca, Phosphaenus hemipterus and Lamprohiza splendidula. An in vivo spectral study was performed to compare bioluminescence spectra. The emission spectrum of a laboratory reared female L. noctiluca was ...

journal_title：Photochemistry and photobiology

authors： De Cock R

更新日期：2004-04-01 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：:We investigated the effect of the cation-π interaction on the susceptibility of a tryptophan model system toward interaction with singlet oxygen, that is, type II photooxidation. The model system consists of two indole units linked to a lariat crown ether to measure the total rate of removal of singlet oxygen by the i...

journal_title：Photochemistry and photobiology

authors： Arevalo GE,Cagan DA,Monsour CG,Garcia AC,McCurdy A,Selke M

更新日期：2020-11-01 00:00:00

abstract：:Fibrous proteins discolor on exposure to the UV component of sunlight. This effect is exacerbated in the presence of fluorescent whitening agents (FWAs), which are often applied to textiles to improve product brightness. Tryptophan photoproducts have been identified as significant contributors to protein photoyellowin...

journal_title：Photochemistry and photobiology

authors： Dyer JM,Clerens S,Cornellison CD,Murphy CJ,Maurdev G,Millington KR

更新日期：2009-11-01 00:00:00

abstract：:Topical photodynamic therapy is used for a variety of malignant and pre-malignant skin disorders, including Bowen's Disease and Superficial Basal Cell Carcinoma. A haem precursor, typically 5-aminolevulinic acid (ALA), acting as a prodrug, is absorbed and converted by the haem biosynthetic pathway to photoactive proto...

journal_title：Photochemistry and photobiology

authors： Donnelly RF,McCarron PA,Woolfson AD

更新日期：2005-07-01 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：:Solar ultraviolet-B radiation (UVB) is essential for epidermal vitamin D production. We aimed to quantitate the relationship between personal solar UV exposure and serum 25hydroxy vitamin D (25[OH]D) concentration. Blood was collected for 25(OH)D analysis in 207 South Australian adults aged 27-61 years. At the time of...

journal_title：Photochemistry and photobiology

authors： Nair-Shalliker V,Clements M,Fenech M,Armstrong BK

更新日期：2013-01-01 00:00:00

abstract：:The two-photon photolysis of liquid CCl4 with 25 ps pulses of 266 nm light has been studied and compared with similar studies with high energy radiation. Both neutral and ionic species are produced from excited states and ionization. The emphasis of the study is on the ionic processes, while some data related to excit...

journal_title：Photochemistry and photobiology

authors： Zhang G,Thomas JK

更新日期：2006-01-01 00:00:00

abstract：:Collagen was exposed to an ultraviolet (UV) lamp that emitted predominantly in the UVB range. The cross-linking of collagen type I and type IV by UV irradiation was observed. Amino acid analyses revealed that Tyr residues in both collagen types I and IV were decreased by irradiation. In collagen type IV, losses of His...

journal_title：Photochemistry and photobiology

authors： Kato Y,Nishikawa T,Kawakishi S

更新日期：1995-04-01 00:00:00

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：:Exposure to ultraviolet radiation is closely linked to the development of skin cancers in humans. The ultraviolet B (UVB) radiation wavelength (280-320 nm), in particular, causes DNA damage in epidermal keratinocytes, which are linked to the generation of signature premalignant mutations. Interactions between dermal f...

journal_title：Photochemistry and photobiology

authors： Fernandez TL,Van Lonkhuyzen DR,Dawson RA,Kimlin MG,Upton Z

更新日期：2014-11-01 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：:Vacuum UV (VUV) process is an incipient advanced oxidation process, which can be used for water treatment. This process relies on the formation of hydroxyl radicals through the VUV-induced photolysis of water. In particular, the use of ozone-generating mercury vapor lamps, which emit 10% of the radiation at 185 nm and...

journal_title：Photochemistry and photobiology

authors： Duca C,Imoberdorf G,Mohseni M

更新日期：2014-01-01 00:00:00

abstract：:Cationic polythiophenes have been shown to be potent antimicrobial compounds due to their ability to absorb visible light and sensitize the production of reactive oxygen species (ROS) as well as their ability to selectively associate with and damage negatively charged cell envelopes. This study demonstrates the abilit...

journal_title：Photochemistry and photobiology

authors： Brown DM,Yang J,Strach EW,Khalil MI,Whitten DG

更新日期：2018-11-01 00:00:00

abstract：:In clinical 5-aminolevulinic acid (ALA)-based photodynamic therapy (PDT) of skin tumors it is desirable to develop vehicles that minimize the penetration of ALA through normal stratum corneum and maximize it through the compromised stratum corneum of the tumors to improve tumor selectivity. We have designed a bioadhes...

journal_title：Photochemistry and photobiology

authors： Donnelly RF,Ma LW,Juzenas P,Iani V,McCarron PA,Woolfson AD,Moan J

更新日期：2006-05-01 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：:Cyclooxygenase (COX)-2 inhibitors are known to be used as chemopreventative agents against certain malignancies. Thus far, there has been very limited information on whether COX-2 inhibitors protect against chronic narrow-band UVB (NB-UVB)-induced immunosuppression. The present study investigated the effect of nonsele...

journal_title：Photochemistry and photobiology

authors： Wu Y,Tai CL,Wei H,He F,Wang Y,Zhao Y,Chen HD

更新日期：2008-03-01 00:00:00

abstract：:Advanced glycation endproducts (AGEs) have been suggested as photosensitizers that are capable of mediating eye lens photo-damage during aging. In the present work, we investigate the photo-crosslinking and oxidation of bovine lens proteins sensitized by AGEs, with special regard to low oxygen conditions. A mechanisti...

journal_title：Photochemistry and photobiology

authors： Fuentealba D,Friguet B,Silva E

更新日期：2009-01-01 00:00:00