Novel Collimated Beam Setup to Study the Kinetics of VUV-Induced Reactions.


: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 90% at 254 nm, is showing very promising results for the degradation of micropollutants. The kinetics of VUV process has been studied in batch- and flow-through reactors, but the effect of 254 and 185 nm photons cannot be isolated, mass transfer resistances can take place and the interpretation of the results is complex. In this technical note, a new VUV collimated beam to conduct kinetic tests is presented, which offers several advantages: (1) it allows the irradiation of samples with 185, 254 nm photons, or both, (2) the concentration of reagents is uniform in the reaction volume and (3) it allows to change the fluence rate by changing the distance between the lamp and the photoreactor. Details of the geometry are presented, as well as an analysis of the collimation and uniformity of the radiation of the new VUV-collimated beam setup.


Photochem Photobiol


Duca C,Imoberdorf G,Mohseni M




Has Abstract


2014-01-01 00:00:00












  • Two new sterically hindered phthalocyanines: synthetic and photodynamic aspects.

    abstract::The synthesis and the properties of 1,4-dibutoxy-2,3-dicyanotriptycene, of a metal-free tetradibenzobarrelenooctabutoxyphthalocyanine, and of the corresponding zinc phthalocyanine are described. The two phthalocyanines do not aggregate when dissolved in benzene at concentrations up to 450 microM. For the metal-free an...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Rihter BD,Bohorquez MD,Rodgers MA,Kenney ME

    更新日期:1992-05-01 00:00:00

  • Photoreaction of new psoralen analogs with DNA: sequence and mutation specificity in the Escherichia coli lacZ gene.

    abstract::New thio- and seleno-analogs of psoralen were synthesized and analyzed for their photoreactivity toward DNA. Using oligonucleotides of defined sequence, we first showed that these derivatives predominantly generated interstrand crosslinks at 5'-TpA sites. We also observed a surprisingly high reactivity of 7H-thiopyran...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Collet M,Sage E,Piette J

    更新日期:1997-08-01 00:00:00

  • Structure and conformation of photosynthetic pigments and related compounds 7. On the conformation of the methyl ester of (20-methyl-phytochlorinato)nickel(II)--a bacteriochlorophyll c model compound.

    abstract::The crystal and molecular structure of the title compound 4 have been determined by single crystal X-ray crystallography. The structure shows the typical S4-ruffled conformation observed for Ni(II) tetrapyrroles. Compared to the structure of the methyl ester of (13(2)-demethoxycarbonyl-pheophorbidato a)nickel(II), 4 s...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Senge MO,Smith KM

    更新日期:1994-08-01 00:00:00

  • Sunscreen protection against ultraviolet radiation-induced pyrimidine dimers in mouse epidermal DNA.

    abstract::Pyrimidine dimers were measured in epidermal DNA of SKH:HR1 mice following exposure to solar-simulated UV radiation (SSUV, 290-400 nm) or to UVA (320-400 nm). Mice were exposed to SSUV or UVA after topical application (2 mg/cm2) of vehicle, a UVB absorber (5% 2-ethylhexyl p-methoxycinnamate [2-EHMC]), or a broad-spect...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Ley RD,Fourtanier A

    更新日期:1997-06-01 00:00:00

  • Photocytotoxicity of water-soluble metalloporphyrin derivatives.

    abstract::A new water-soluble porphyrin derivative, 2,4-bis(1-decyloxyethyl)-deuteroporphyrinyl-6,7-bisaspart ic acid (C10-DP), and its metal complexes (Ga, I(n), Zn, Mn, Cu, Ni and Fe) were examined for their physicochemical properties (absorption, fluorescence, triplet lifetime and partition coefficient) and photocytotoxicity...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Ando T,Irie K,Koshimizu K,Takemura T,Nishino H,Iwashima A,Takeda N,Nakajima S,Sakata I

    更新日期:1993-04-01 00:00:00

  • Enhancement of fluoresceinyl cypridina luciferin analog chemiluminescence by human serum albumin for singlet oxygen detection.

    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

    pub_type: 杂志文章


    authors: Zhou J,Xing D,Chen Q

    更新日期:2006-07-01 00:00:00

  • In vitro photodynamic activity of kryptocyanine.

    abstract::The photophysical properties of 1,1'-diethyl-4,4'-carbocyanine chloride (kryptocyanine) have been measured in methanol solution and for the dye bound to human serum albumin, incorporated in neutral micelles and after incubation with leukemia cells. In all cases, it is found that formation of the triplet state of the d...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Harriman A,Luengo G,Gulliya KS

    更新日期:1990-10-01 00:00:00

  • Identification of sites within a monomeric red fluorescent protein that tolerate peptide insertion and testing of corresponding circular permutations.

    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

    pub_type: 杂志文章


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

    更新日期:2008-01-01 00:00:00

  • Immunological and biochemical evidence that blepharismin is not a prosthetic group.

    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

    pub_type: 杂志文章


    authors: Podestà A,Gioffré D,Grossi T,Montagnoli G

    更新日期:2000-05-01 00:00:00

  • Singlet oxygen reacts with 2',7'-dichlorodihydrofluorescein and contributes to the formation of 2',7'-dichlorofluorescein.

    abstract::There are controversial reports in the literature concerning the reactivity of singlet oxygen ((1)O(2)) with the redox probe 2',7'-dichlorodihydrofluorescein (DCFH). By carefully preparing solutions in which (1)O(2) is quantitatively generated in the presence of DCFH, we were able to show that the formation rate of th...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Daghastanli NA,Itri R,Baptista MS

    更新日期:2008-09-01 00:00:00

  • Solar UV exposure of seafarers along subtropical and tropical shipping routes.

    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

    pub_type: 杂志文章


    authors: Feister U,Meyer G,Kirst U

    更新日期:2013-11-01 00:00:00

  • DNA damage checkpoint responses in the S phase of synchronized diploid human fibroblasts.

    abstract::We investigated the hypothesis that the strength of the activation of the intra-S DNA damage checkpoint varies within the S phase. Synchronized diploid human fibroblasts were exposed to either 0 or 2.5 J m(-2) UVC in early, mid- and late-S phase. The endpoints measured were the following: (1) radio-resistant DNA synth...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Chastain PD 2nd,Brylawski BP,Zhou YC,Rao S,Chu H,Ibrahim JG,Kaufmann WK,Cordeiro-Stone M

    更新日期:2015-01-01 00:00:00

  • Molecular mechanism of drug photosensitization. 7. Photocleavage of DNA sensitized by suprofen.

    abstract::Ultraviolet-A irradiation of a suprofen (2-[4-2(2-thenoyl) phenyl]propionic acid) (SPF) buffered solution (pH 7.4) in the presence of supercoiled pBR322 DNA leads to single strand breaks with the formation of an open circular form and subsequent linearization of the plasmid. On the basis of agarose gel electrophoresis...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Condorelli G,Constanzo LL,De Guidi G,Giuffrida S,Sortino S

    更新日期:1995-07-01 00:00:00

  • Depth measurements and histopathological characterization of photodynamic therapy generated normal brain necrosis as a function of incident optical energy dose.

    abstract::The response of normal brain to photodynamic therapy (PDT) was investigated in 62 Fisher rats. The animals were injected i.p. with Photofrin II (12.5 mg/kg). Forty-eight hours following injection, an area of dura 5 mm in diameter over the frontal cortex was photoactivated with red light (632 +/- 2 nm) at 100 mW cm-2, ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Dereski MO,Chopp M,Garcia JH,Hetzel FW

    更新日期:1991-07-01 00:00:00

  • Do melanoidins induced by topical 9% dihydroxyacetone sunless tanning spray inhibit vitamin d production? A pilot study.

    abstract::We report here preliminary pilot study data of the effect of sunless tanning spray with 9% [Correction added after online publication (August 24th, 2009): The concentration of Dihydroxyacetone used in the study was 9% and not 3% as previously stated] dihydroxyacetone (DHA) on 25-hydroxyvitamin D [25(OH)D] serum levels...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Armas LA,Fusaro RM,Sayre RM,Huerter CJ,Heaney RP

    更新日期:2009-09-01 00:00:00

  • Spectroscopic properties of fluorescein and rhodamine dyes attached to DNA.

    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

    pub_type: 杂志文章


    authors: Delgadillo RF,Parkhurst LJ

    更新日期:2010-03-01 00:00:00

  • Cytotoxicity and mutagenicity of ophthalmic solution preservatives and UVA radiation in L5178Y cells.

    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

    pub_type: 杂志文章


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

    更新日期:1989-09-01 00:00:00

  • Action spectra and chromophores for lethal photosensitization of Candida albicans by DNA monoadducts formed by 8-methoxypsoralen and monofunctional furocoumarins.

    abstract::The red-shift of furocoumarin action spectra, compared with their absorption spectra, has been investigated. An action spectrum for 8-methoxypsoralen (8-MOP) monoadduct formation in the yeast Candida albicans has been determined. The yeast cells were initially exposed to sublethal doses of monochromatic UVA at differe...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Baydoun SA,Gibbs NK,Young AR

    更新日期:1989-12-01 00:00:00

  • Comparative analysis of GPCR crystal structures.

    abstract::The phototransduction cascade is perhaps the best understood model system for G protein-coupled receptor (GPCR) signaling. Phototransduction links the absorption of a single photon of light to a decrease in cytosolic cGMP. Depletion of the cGMP pool induces closure of cGMP-gated cation channels resulting in the hyperp...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章,评审


    authors: Lodowski DT,Angel TE,Palczewski K

    更新日期:2009-03-01 00:00:00

  • Additional evidence for the cyclic GMP signaling pathway resulting in the photophobic behavior of Stentor coeruleus.

    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

    pub_type: 杂志文章


    authors: Walerczyk M,Fabczak S

    更新日期:2001-12-01 00:00:00

  • Biodistribution and pharmacokinetic studies of a porphyrin dimer photosensitizer (Oxdime) by fluorescence imaging and spectroscopy in mice bearing xenograft tumors.

    abstract::Herein, we present a study of the pharmacokinetics and biodistribution of a butadiyne-linked conjugated porphyrin dimer (Oxdime) designed to have high near-infrared (NIR) 2-photon absorption cross-section for photodynamic therapy (PDT). Changes in biodistribution over time were monitored in mice carrying B16-F10 melan...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Khurana M,Ulrich S,Kim A,Moriyama Y,Netchev G,Akens MK,Anderson HL,Wilson BC

    更新日期:2012-11-01 00:00:00

  • Analysis of two kinds of tree as physical barriers against erythemal UVB radiation received.

    abstract::Differences between global radiation UVER (erythemal ultraviolet solar radiation) received under full sun and diffuse radiation received under the shadow of two types of tree are analyzed to check the importance of these components on human exposure to UV radiation. Blue Line spores dosimeters of VioSpor were used for...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Ysasi GG,Ribera LJ

    更新日期:2013-05-01 00:00:00

  • Advanced glycation endproducts induce photocrosslinking and oxidation of bovine lens proteins through type-I mechanism.

    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

    pub_type: 杂志文章


    authors: Fuentealba D,Friguet B,Silva E

    更新日期:2009-01-01 00:00:00

  • Photoproducts formed in the photoyellowing of collagen in the presence of a fluorescent whitening agent.

    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

    pub_type: 杂志文章


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

    更新日期:2009-11-01 00:00:00

  • Oxygen limitation of direct tumor cell kill during photodynamic treatment of a murine tumor model.

    abstract::The relationship between levels of in vivo accumulated photosensitizer (Photofrin II), photodynamic cell inactivation upon in vitro or in vivo illumination, and changing tumor oxygenation was studied in the radiation-induced fibrosarcoma (RIF) mouse tumor model. In vivo porphyrin uptake by tumor cells was assessed by ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Henderson BW,Fingar VH

    更新日期:1989-03-01 00:00:00

  • Simulation of ozone depletion using ambient irradiance supplemented with UV lamps.

    abstract::In studies of the biological effects of UV radiation, ozone depletion can be mimicked by performing the study under ambient conditions and adding radiation with UV-B lamps. We evaluated this methodology at three different locations along a latitudinal gradient: Rimouski (Canada), Ubatuba (Brazil) and Ushuaia (Argentin...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Díaz S,Camilión C,Escobar J,Deferrari G,Roy S,Lacoste K,Demers S,Belzile C,Ferreyra G,Gianesella S,Gosselin M,Nozais C,Pelletier E,Schloss I,Vernet M

    更新日期:2006-07-01 00:00:00

  • Species-specific responses to combined thermal-irradiance stress in microalgae--"each is to its own".

    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

    pub_type: 评论,杂志文章


    authors: Neale P

    更新日期:2013-07-01 00:00:00

  • Facile Fabrication of Porous ZnS and ZnO Films by Coaxial Electrospinning for Highly Efficient Photodegradation of Organic Dyes.

    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

    pub_type: 杂志文章


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

    更新日期:2018-01-01 00:00:00

  • Photosensitization with a chlorin-thiobarbiturate conjugate.

    abstract::The photobiologic properties of a chlorin-thiobarbiturate conjugate were examined. In addition to the characteristic 670 nm chlorin absorbance, the conjugate exhibited new absorbance bands at 517 and 743 nm, but these were not a part of the fluorescence emission spectra, nor was fluorescence observed at wavelengths > ...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Kessel D,Morgan A

    更新日期:1994-05-01 00:00:00

  • Multispectral imaging autofluorescence microscopy for the analysis of lymph-node tissues.

    abstract::Although histochemical and immunohistochemical methods are the standard procedures in diagnosis of lymphoproliferative disorders, useful improvements in evidencing histopathologic manifestations can be obtained with the introduction of tissue autofluorescence analyses. We used microspectrofluorometry and a Multispectr...

    journal_title:Photochemistry and photobiology

    pub_type: 杂志文章


    authors: Rigacci L,Alterini R,Bernabei PA,Ferrini PR,Agati G,Fusi F,Monici M

    更新日期:2000-06-01 00:00:00