Absorbance changes by aromatic amino acid side chains in early rhodopsin photointermediates.

abstract：:Skin cancer is the most prevalent cancer, and its assessment remains a challenge for physicians. This study reports the application of an optical sensing method, elastic scattering spectroscopy (ESS), coupled with a classifier that was developed with machine learning, to assist in the discrimination of skin lesions th...

journal_title：Photochemistry and photobiology

authors： Rodriguez-Diaz E,Manolakos D,Christman H,Bonning MA,Geisse JK,A'Amar OM,Leffell DJ,Bigio IJ

更新日期：2019-11-01 00:00:00

abstract：:Polysulphone (PS) dosimetry has been a widely used technique for more than 30 years to quantify the erythemally effective UV dose received by anatomic sites (personal exposure). The calibration of PS dosimeters is an important issue as their spectral response is different from the erythemal action spectrum. It is perf...

journal_title：Photochemistry and photobiology

authors： Casale GR,Siani AM,Diémoz H,Kimlin MG,Colosimo A

更新日期：2012-01-01 00:00:00

abstract：:The tetraruthenated porphyrin, mu-[meso-5,10,15,20-tetra(pyridyl)porphyrin]tetrakis[bis-(bipyridine) chloride ruthenium(II)] (TRP) is a supramolecular cationic species. The aim of the present investigation was to evaluate the photodynamic properties of TRP and Zn-TRP to damage DNA with emphasis on the mechanistic aspe...

journal_title：Photochemistry and photobiology

authors： Ravanat JL,Cadet J,Araki K,Toma HE,Medeiros MH,Mascio PD

更新日期：1998-11-01 00:00:00

abstract：:Lutetium texaphyrin, PCI-0123, is a pure, water-soluble photosensitizer with a large broad absorption band centered at 732 nm. The compound was tested for photodynamic therapy (PDT) effectiveness in a murine mammary cancer model. The texaphyrin macrocycle as illustrated by magnetic resonance imaging and 14C-radiolabel...

journal_title：Photochemistry and photobiology

authors： Young SW,Woodburn KW,Wright M,Mody TD,Fan Q,Sessler JL,Dow WC,Miller RA

更新日期：1996-06-01 00:00:00

abstract：:We have investigated the factors that affect the virucidal activity of methylene blue (MB) photosensitization. The M13 bacteriophage was more rapidly inactivated at higher temperatures (6 degrees C < 24 degrees C < 38 degrees C). Rate constants for inactivation were 0.072, 0.139 and 0.260 (log10 inactivation)/ (J/cm2)...

journal_title：Photochemistry and photobiology

authors： Abe H,Wagner SJ,Kuwabara M,Kamo N,Ikebuchi K,Sekiguchi S

更新日期：1997-05-01 00:00:00

abstract：:The wavelength dependence of an ultraviolet irradiation of the DNA substrate for a human endonuclease was determined. Sites of DNA incision for all UVB and UVC wavelengths examined were at cytosines which were neither cyclobutane pyrimidine dimers nor 6-4'-(pyrimidin-2-one)pyrimidines. The optimal wavelengths for form...

journal_title：Photochemistry and photobiology

authors： Gallagher PE,Weiss RB,Brent TP,Duker NJ

更新日期：1989-03-01 00:00:00

abstract：:Spatio-temporal patterns in sun exposure underlie variations in skin cancer incidence and vitamin D deficiency, indicate effectiveness of sun protection programs and provide insights into future health risks. From 558 adults across four regions of Australia (Brisbane (27°S), Newcastle (33°S), Geelong and the Western D...

journal_title：Photochemistry and photobiology

authors： Lucas RM,Valery P,van der Mei I,Dwyer T,Pender MP,Taylor B,Ponsonby AL,Ausimmune Investigator Group.

更新日期：2013-05-01 00:00:00

abstract：:The photocycle in photoactive yellow protein (PYP) crystals was studied by single-crystal absorption spectroscopy with experimental setups for low-temperature and time-resolved measurements. Thin and flat PYP crystals, suitable for light absorption studies, were obtained using special crystallization conditions. Illum...

journal_title：Photochemistry and photobiology

authors： Kort R,Ravelli RB,Schotte F,Bourgeois D,Crielaard W,Hellingwerf KJ,Wulff M

更新日期：2003-08-01 00:00:00

abstract：:Exposure of solutions containing both tryptophan and hydrogen peroxide to a pulsed ( approximately 180 fs) laser beam at 750 nm induces luminescence characteristic of 5-hydroxytryptophan. The results indicate that 3-photon excitation of tryptophan results in photoionization within the focal volume of the laser beam. T...

journal_title：Photochemistry and photobiology

authors： Bisby RH,Crisostomo AG,Botchway SW,Parker AW

更新日期：2009-01-01 00:00:00

abstract：:A targeting strategy based on the selective enzyme-mediated activation of polymeric photosensitizer prodrugs (PPP) within pathological tissue has led to the development of agents with the dual ability to detect and treat cancer. Herein, a detailed study of a simple model system for these prodrugs is described. We prep...

journal_title：Photochemistry and photobiology

authors： Campo MA,Gabriel D,Kucera P,Gurny R,Lange N

更新日期：2007-07-01 00:00:00

abstract：:We report the spectroscopic properties of fluorescein, x-rhodamine, tetramethyl-rhodamine, attached to single strand, duplex DNA, and to the digestion products by DNAse I. The properties reported include: molar absorptivity, quantum yield, absorbance and fluorescence spectra, fluorescence lifetime, intrinsic lifetime ...

journal_title：Photochemistry and photobiology

authors： Delgadillo RF,Parkhurst LJ

更新日期：2010-03-01 00:00:00

abstract：:Organisms living in coastal waters are exposed to anthropogenic contaminants from terrestrial drainage, ice melting and maritime traffic and to enhanced UVB radiation (UVBR; 280-320 nm) caused by decreased concentrations of ozone in the stratosphere. This article reviews available information about the combined effect...

journal_title：Photochemistry and photobiology

authors： Pelletier E,Sargian P,Payet J,Demers S

更新日期：2006-07-01 00:00:00

abstract：:The aim of this investigation is the evaluation of DNA interaction of with tetraruthenated porphyrin (TRP) and of DNA damage in the presence of light. Direct-fluorescence and electronic absorption measurements after incubation of DNA with TRP indicate strong binding between pBR322 DNA or calf thymus DNA with the modif...

journal_title：Photochemistry and photobiology

authors： Onuki J,Ribas AV,Medeiros MH,Araki K,Toma HE,Catalani LH,Di Mascio P

更新日期：1996-03-01 00:00:00

abstract：:Gel sequencing experiments with the 5'- and 3'-end-labeled oligonucleotides d(A3GA4GA5GA6GA3G) and d(AT)10 have demonstrated that dimeric adenine photoproducts and thymine-adenine photoadducts constitute alkali-labile lesions in UV-irradiated DNA. On treatment with hot piperidine, DNA strand breakage occurs predominan...

journal_title：Photochemistry and photobiology

authors： Hejmadi V,Stevenson C,Kumar S,Davies RJ

更新日期：1994-02-01 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 proton channels of the bacteriorhodopsin (BR) proton pump contain bound water molecules. The channels connect the purple membrane surfaces with the protonated retinal Schiff base at the membrane center. Films of purple membrane equilibrated at low relative humidity display a shift of the 570 nm retinal absorbance ...

journal_title：Photochemistry and photobiology

authors： Renthal R,Gracia N,Regalado R

更新日期：2000-11-01 00:00:00

abstract：:The UVA and UVB components of sunlight can produce three classes of bipyrimidine DNA photolesions [cyclobutane pyrimidine dimers (CPDs), pyrimidine (6-4) pyrimidone photoproducts (6-4PPs) and related Dewar valence isomers (DewarPPs)]. The UVA/UVB ratio of sunlight is high in winter and low in summer in the Northern He...

journal_title：Photochemistry and photobiology

authors： Nishimura K,Ikehata H,Douki T,Cadet J,Sugiura S,Mori T

更新日期：2020-12-03 00:00:00

abstract：:Protoporphyrin IX dimethyl ester (PME), a dimethyl esterification of protoporphyrin IX (PpIX), exhibits higher intracellular uptake into NPC/CNE2 cells, a poorly differentiated human nasopharyngeal carcinoma, than does PpIX. Phototoxicity studies reveal PME to be a more potent photosensitizer than is PpIX, at the earl...

journal_title：Photochemistry and photobiology

authors： Yee KK,Soo KC,Bay BH,Olivo M

更新日期：2002-12-01 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：:Extracellular pH was measured continuously and noninvasively in hairless mice using a transcutaneous spectrofluorometric technique and a fluorescent pH probe, bis-carboxyethyl carboxyfluorescein (BCECF). The acid form of BCECF was injected intravenously. An optical fiber system excited the fluorescent probe at 450 and...

journal_title：Photochemistry and photobiology

authors： Russell DA,Pottier RH,Valenzeno DP

更新日期：1994-03-01 00:00:00

abstract：:The Photochemical Research Group from San Luis (Argentina) highlights the contributions of Dr. Norman Andino García to the development of the group as a way to show him our gratitude for all his support. ...

journal_title：Photochemistry and photobiology

authors： Ferrari G,Montaña MP

更新日期：2018-11-01 00:00:00

abstract：:Skh:HR-1 hairless mice were irradiated chronically with sub-erythemal doses of UVB radiation, and a number of biochemical parameters in the skin were determined after 6, 12, 18, and 24 wk of exposure. The parameters measured were water, collagen, elastin, and glycosaminoglycan content; collagenase and elastase levels;...

journal_title：Photochemistry and photobiology

authors： Chatterjee R,Benzinger MJ,Ritter JL,Bissett DL

更新日期：1990-01-01 00:00:00

abstract：:Unlike the enchanting yellow-green flashes of light produced on warm summer evenings by Photinus pyralis, the most common firefly species in North America, the orange lights of Photinus scintillans are infrequently observed. These Photinus species, and likely all bioluminescent beetles, use the same substrates beetle ...

journal_title：Photochemistry and photobiology

authors： Branchini BR,Southworth TL,Fontaine DM,Murtiashaw MH,McGurk A,Talukder MH,Qureshi R,Yetil D,Sundlov JA,Gulick AM

更新日期：2017-03-01 00:00:00

abstract：:We have studied the photophysics and rotational diffusion of hydrophilic solute 7-(N, N'-diethylamino)coumarin-3-carboxylic acid (7-DCCA) in a room temperature ionic liquid methyltrioctylammonium bis(trifluoromethylsulfonyl) imide ([N1888 ][NTf2 ]). Comparison of activation energies of viscous flow and nonradiative de...

journal_title：Photochemistry and photobiology

authors： Chatterjee A,Maity B,Ahmed SA,Seth D

更新日期：2015-09-01 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：:A set of linear and asymmetric coumarin-imidazole hybrid compounds having a N,N-diethylamine at 7-position and imidazole at 3-position on the coumarin were synthesized. Insertion of thiophene π-spacer between coumarin and imidazole moieties (5b, 5d) leads to redshifted absorption and emission compared to 5a and 5c. Al...

journal_title：Photochemistry and photobiology

authors： Bhagwat AA,Avhad KC,Patil DS,Sekar N

更新日期：2019-05-01 00:00:00

abstract：:Bacteriochlorophyll (BChl) e was coassembled with BChl c in Triton X-100 micelles in aqueous solutions. The Qy absorption bands of the coaggregates were positioned between those of aggregates consisting solely of BChl c or e. The electronic absorption spectra of the coaggregates could not be reproduced by linear combi...

journal_title：Photochemistry and photobiology

authors： Saga Y,Saiki T,Takahashi N,Shibata Y,Tamiaki H

更新日期：2014-05-01 00:00:00

abstract：:Cyanines are emerging as useful agents for photoreleasing biological compounds because of their capability of utilizing near-infrared (NIR) light. Another benefit is their ability to self-sensitize to produce singlet oxygen for the release of aryl amines, a process that has not been as feasible in the past. Here, we h...

journal_title：Photochemistry and photobiology

authors： Mathew JP,Greer A

更新日期：2019-09-01 00:00:00

abstract：:Because metallothionein (MT) is elevated and may be protective in UV-irradiated skin, we have studied the effects of UV and other agents on MT transcription using the sheep MT 1A promoter, linked to the beta-galactosidase gene and stably transfected into human cell lines. beta-galactosidase reporter activity was induc...

journal_title：Photochemistry and photobiology

authors： Hansen C,Ablett E,Green A,Sturm RA,Dunn IS,Fairlie DP,West ML,Parsons PG

更新日期：1997-03-01 00:00:00

abstract：:Raman spectroscopy (RS) has potential for disease classification within the gastrointestinal tract (GI). A near-infrared (NIR) fiber-optic RS system has been developed previously. This study reports the first in vivo Raman spectra of human gastrointestinal tissues measured during routine clinical endoscopy. This was a...

journal_title：Photochemistry and photobiology

authors： Shim MG,Song LM,Marcon NE,Wilson BC

更新日期：2000-07-01 00:00:00