Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

MB Research Laboratories - Glycerol-Mediated Photoreduction of Hexavalent Chromium   (Site not responding. Last check: 2007-11-06) This photoreduction occurred after irradiation with either UVA (320-400 nm) or a wide spectrum light source, but not a UVB (290-320 nm) light source. Photoreduction of hexavalent chromium was found to be pH-dependent and did not occur in dilute solutions of sodium hydroxide. This reaction is apparently dependent on the unsubstituted alcohol groups of glycerol since alpha-phosphoglycerol or beta-phosphoglycerol did not support the photoreduction of hexavalent chromium. www.mbresearch.com /gly-med.htm   (181 words)

RE: Photoreduction of iron and other elements Paul Sears asked for the references Diana Walstad used for her comments on photoreduction of iron..... Re: [photoreduction], which also aplies to manganese and copper, is greatly accellerated by DOC. Photoreduction of manganese oxides in seawater and its geochemical and biological implications. fins.actwin.com /aquatic-plants/month.200002/msg00318.html   (514 words)

Chapter 1 - Preventive Law in the Medical Environment - Photoreduction of Records It demands that the photoreduction process be carefully controlled and that the reduced records be constantly monitored to make sure that each one is legible. Photoreduction materials are able to record only certain colors of ink accurately. Once photoreductions have been made of the medical record, it is permissible to destroy the original record by shredding or burning. biotech.law.lsu.edu /Books/aspen/Aspen-Photored.html   (506 words)

Transition metal photoreduction systems and processes - Patent 4314019 The photoreductants employed in the practice of this invention shift the position of or change the number of atoms contained within the molecule in the course of conversion to the corresponding reducing agent. In other photoreductants conversion to the corresponding reducing agent may require that an adjuvant be present in intimate association with the photoreductant to donate the necessary atoms to permit formation of the reducing agent. In each of these, the photoreductant was coated on filter paper by dipping the filter paper into a solution prepared by dissolving 0.1 g of the photoreductant in 10 ml of acetone or methanol, after which the paper was dried. www.freepatentsonline.com /4314019.html   (12970 words)

Protein conformational perturbations affect the photoreduction of native cytochrome c peroxidase (III) at alkaline pH.   (Site not responding. Last check: 2007-11-06) Protein conformational perturbations affect the photoreduction of native cytochrome c peroxidase (III) at alkaline pH. Photoreduction of alkaline CCP(III) most likely involves intramolecular electron transfer (ET) from the aromatic residue in the proximal heme pocket to the photoexcited heme. The formation of 6c/1s heme coincides with the onset of appreciable photoreduction (between laser pulses, > 60 ms) of CCP (III) at alkaline pH, suggesting a global protein conformational rearrangement within or around its heme pocket. www.pdg.cnb.uam.es /UniPub/iHOP/gp/78148.html   (217 words)

Genes encoding A-type flavoproteins are essential for photoreduction of O2 in cyanobacteria. O(2) photoreduction by photosynthetic electron transfer, the Mehler reaction, was observed in all groups of oxygenic photosynthetic organisms, but the electron transport chain mediating this reaction remains unidentified. We conclude that the source of electrons for O(2) photoreduction is PSI and that the highly conserved A-type flavoproteins Flv1 and Flv3 are essential for this process in vivo. We propose that in cyanobacteria, contrary to eukaryotes, the Mehler reaction produces no reactive oxygen species and may be evolutionarily related to the response of anaerobic bacteria to O(2). www.medscape.com /medline/abstract/12573219   (306 words)

Photoreduction of protochlorophyllide "a" to chlorophyllide "a" during the biogenesis of the photosynthetic apparatus ... Photoreduction of protochlorophyllide "a" to chlorophyllide "a" during the biogenesis of the photosynthetic apparatus in higher plants -- Books Photoreduction of protochlorophyllide "a" to chlorophyllide "a" during the biogenesis of the photosynthetic apparatus in higher plants We conclude that the mechanism of photoreduction is independent on the leaf developmental stage. cadgate.com /book/un/1581120974   (387 words)

Organic Matter Binding and Photoreduction of Mercuric Ion and Methylmercury in Surface Water Organic Matter Binding and Photoreduction of Mercuric Ion and Methylmercury in Surface Water complexation by NDOM in mediating the photoreduction of these species to elemental Hg, which is volatile and thus is subject to subsequent efflux from water bodies. A full understanding of the transport and transformations of Hg in natural waters requires quantitative information on these processes. water.usgs.gov /wrri/98grants/MinnesotaOrganic.htm   (542 words)

Noninvasive Auto-Photoreduction Used as a Tool for Studying Structural Changes in Heme-Copper Oxidases by FTIR ... Photoreductive titration of the resonance Raman spectra of cytochrome oxidase in whole mitochondria. Photoreduction of heme proteins: spectroscopic studies and cross-section measurements. Photoreduction of methemoglobin by irradiation in the near-ultraviolet region. www.biophysj.org /cgi/content/full/86/5/3230   (5648 words)

Catalogo Articoli   (Site not responding. Last check: 2007-11-06) Kinetics of the photoreduction of bis(2,4-pentanedionato)copper(II) in chloroform Photoreduction of ortho-benzoquinones in the presence of para-substituted N,N-dimethylanilines The photoreduction of H2O2 by Synechococcus sp PCC 7942 and UTEX 625 serials.cib.unibo.it /cgi-ser/start/it/spogli/ds-s.tcl?soggetti=PHOTOREDUCTION   (2156 words)

The Photoreduction of H2O2 by Synechococcus sp. PCC 7942 and UTEX 625 -- Miller et al. 123 (2): 625 -- PLANT PHYSIOLOGY photoreduction by the unicellular cyanobacterium Synechocystis PCC 6803 as determined by the quenching of chlorophyll fluorescence. Li Q, Canvin DT (1997a) Oxygen photoreduction and its effects on CO accumulation and assimilation in air-grown cells of Synechococcus UTEX 625. Miyake C, Asada K (1994) Ferredoxin-dependent photoreduction of the monodehydroascorbate radical in spinach thylakoids. www.plantphysiol.org /cgi/content/full/123/2/625   (4295 words)

Photoreduction of zinc protopheophorbide b with NADPH- protochlorophyllide oxidoreductase from etiolated wheat ...   (Site not responding. Last check: 2007-11-06) Photoreduction of zinc protopheophorbide b with NADPH- protochlorophyllide oxidoreductase from etiolated wheat (Triticum aestivum L.) -- Schoch et al. Photoreduction of zinc protopheophorbide b with NADPH- protochlorophyllide oxidoreductase from etiolated wheat (Triticum aestivum L.) Photoreduction did not occur with the esterified protochlorophylls a and b. content.febsjournal.org /cgi/content/abstract/229/1/291   (450 words)

[Study of oxygen photoreduction in chloroplasts by the method of luminol and chlorophyll chemiluminescence].   (Site not responding. Last check: 2007-11-06) [Study of oxygen photoreduction in chloroplasts by the method of luminol and chlorophyll chemiluminescence]. [Study of oxygen photoreduction in chloroplasts by the method of luminol and chlorophyll chemiluminescence].The rate of HO2 dissappearance was increased by methylviologen. In the second case when chloroplasts were illuminated in the presence of chemiluminescence system and oxygen the fact delayed luminescence of luminol was observed. www.pdg.cnb.uam.es /UniPub/iHOP/gp/2291332.html   (216 words)

Kemian laitos   (Site not responding. Last check: 2007-11-06) Photoreduction in Methanol Solutions Containing Free Br- and Cl- Ions, Journal of Photochemistry and Photobiology A: Chem. Tyystjärvi, J. Karunen and H. Lemmetyinen: Measurement of photosynthetic oxygen evolution with a new type of oxygen sensor, Photosynthesis Research 56 (1998) 223. Ivanov, N. Tkachenko and H. Lemmetyinen: Photoreduction of IrCl www.tut.fi /units/ymp/kem/publication/p1998.html   (195 words)

Radiation sensitive co(III)complex photoreduction element with image recording layer - Patent 4201588 In still another aspect this invention is directed to a process comprising exposing a radiation-sensitive layer containing a photoreductant and a ligand containing cobalt(III)-complex to electromagnetic radiation of a wavelength longer than 300 nanometers to convert the photoreductant to a reducing agent. A variety of compounds are known in the art to be photoreductants. We have discovered that it is possible to produce optically dense cobalt(II) compounds useful in forming negative images by incorporating into the radiation-sensitive layer a compound capable of chelating with the cobalt(II) atom formed on reduction of the cobalt(III) complex. www.freepatentsonline.com /4201588.html   (12776 words)

Photochemistry and Photobiology: Photoreduction of bacteriorhodopsin Schiff base at low humidity. A study with ... Photoreduction of bacteriorhodopsin Schiff base at low humidity. In the present work we have studied the effect of different protein hydration levels on the photoreductive reaction, as well as the consequences of preventing isomerization around the critical C^sub 13^=C^sub 14^ retinal double bond. It was revealed that the rate of light-induced NaBH^sub 4^ reaction can be fitted to three phases, between 100 and 87%, from 87 to 35% and below 35% relative humidities (r.h.). www.gobelle.com /p/articles/mi_qa3931/is_200206/ai_n9114152   (1442 words)

Publication: Site-directed conversion of a cysteine to aspartate leads to the assembly of a [3Fe-4S] cluster in PsaC of ... Publication: Site-directed conversion of a cysteine to aspartate leads to the assembly of a [3Fe-4S] cluster in PsaC of photosystem I. The photoreduction of FA is independent of FB. Site-directed conversion of a cysteine to aspartate leads to the assembly of a [3Fe-4S] cluster in PsaC of photosystem I. The photoreduction of FA is independent of FB. The terminal electron acceptors FA and FB exist as two [4Fe-4S] clusters located on the 8.9-kDa PsaC protein in photosystem I. We have used site-directed mutagenesis to produce a complementary pair of mutant PsaC proteins in which specific cysteine ligands to the [4Fe-4S] clusters were changed to aspartic acid residues. www.fred.psu.edu /ds/retrieve/fred/publication/1318744   (246 words)

Protochlorophyllide oxidoreductase B-catalyzed protochlorophyllide photoreduction in vitro: Insight into the mechanism ... Protochlorophyllide oxidoreductase B-catalyzed protochlorophyllide photoreduction in vitro: Insight into the mechanism of chlorophyll formation in light-adapted plants -- Lebedev and Timko 96 (17): 9954 -- Proceedings of the National Academy of Sciences The rate of the PChlide photoreduction reaction at room temperature depended on the concentration of enzyme (Fig. in the course of PChlide photoreduction in vitro. www.pnas.org /cgi/content/full/96/17/9954   (4511 words)

Botany online: Photosynthesis - Light Reactions To the right: the original concept of non-cyclic photophosphorylation (according to D. The only unexplained process remained was the photoreduction of NADP in chloroplasts. They could prove experimentally that the photoreduction of NADP and the synthesis of ATP are coupled. What was at first regarded as a photoreduction of NADP proved to be an electron transport chain that runs from ferredoxin via a flavin component to NADP. www.biologie.uni-hamburg.de /b-online/e24/24c.htm   (1605 words)

ongoing · On Reducing Images Here in ongoing, the images normally are scaled down to a width of 300 pixels (linked to a full-size version). Currently, I’m using the open-source GD image library to do the photoreduction; the usability is excellent but I’m unsatisfied with the quality of the results. First of all, I freely confess that my understanding of graphics programming is very limited and; in this arena, I’m merely someone who wants to write some code to achieve a result. www.tbray.org /ongoing/When/200x/2003/10/06/Photoreduction   (215 words)

Removal of Aqueous Cr(VI) by TiO2 Semiconductor Photoreduction/Precipitation The higher yield for Cr(VI) photoreduction was due to Fe(III) and Cr(III) hydroxides. An acidic medium is favorable for Cr(VI) photoreduction, where a 94% yield for Cr(VI) photoreduction within one hour was obtained. The photoreduction mainly occurs on the TiO2 surface and the addition of Fe(III) improved it. www.eng.nus.edu.sg /EResnews/0302/rd/rd_1.html   (595 words)

NDRL Radiation Chemistry Data Center -- Current Papers in Radiation and Photochemistry Photoreduction induced by electron transfer from di- and trialkylamines to the triplet state of nitronaphthalenes in polar media. Photoreduction of benzophenone analogues by alcohol and ether: Self recognition molecular assemblies. Selective photoreduction of nitrophenyl ethers by amines in ternary [beta]-cyclodextrin complexes. allen.rad.nd.edu /recent_papers/2002/bwl0207.htm   (1799 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.