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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Photoreduction"”.
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The Reversible Photoreduction of Chlorophyll
Made available in DSpace on 2014-12-05T20:55:38Z (GMT). No. of bitstreams: 1 5900467.pdf: 6564688 bytes, checksum: c454fbdabe607feceaf7f896412f930d (MD5) Previous issue date: 1958
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Photoreduction of Benzaldehydes in Isopropyl Alcohol
No abstract prepared.
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Prebiotic photoreduction and polymerization of cysteinyl peptides.
Cysteinyl peptides likely played an important role in the prebiotic synthesis of cofactors, such as iron-sulfur clusters. However, cysteinyl peptides must be reduced in order to coordinate iron-sulfur clusters. Mixtures of ferric ions and cysteinyl peptides leads to the reduction of ferric to …
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Studies on the Photoreduction of Quinone Analogues in Bacterial Photosynthetic Reaction Centers
Made available in DSpace on 2014-12-15T23:19:00Z (GMT). No. of bitstreams: 1 8721709.pdf: 7766249 bytes, checksum: 5eee5ad815c5641146d939f706d0fe43 (MD5) Previous issue date: 1986
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Cycling of Iron and Manganese (Oxyhydr)oxides in the Presence of Organic Matter
… the balance between microbial Mn oxidation and photoreduction. In Chapter 3, we further explore Mn oxide photoreduction in the presence of organic matter. We find that photoreduction apparent quantum yields (AQYs) of 𝛿-MnO₂ in humic acid solutions decrease with wavelength regardless of pH, and …
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ΜΕΛΕΤΗ ΤΗΣ ΦΩΤΟΧΗΜΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΕΤΕΡΟΠΟΛΥΕΝΩΣΕΩΝ ΒΟΛΦΡΑΜΙΟΥ ΚΑΙ ΜΟΛΥΒΔΑΙΝΙΟΥ ΣΧΕΤΙΚΑ ΜΕ ΤΗΝ ΕΦΑΡΜΟΓΗ ΤΟΥΣ ΣΕ ΦΩΤΟΗΛΕΚΤΡΟΧΗΜΙΚΑ ΣΤΟ...
… KEGGIN-DAWSON STRUCTURES UNDERGO MULTIELECTRON PHOTOREDUCTION IN THE PRESENCE OF A GREAT VARIETY OF ORGANIC REAGENTS IN NEAR VISIBLE AND UV LIGHT WITH CONCOMITANT OXIDATION OF THE ORGANIC SPECIES, WHICH IS CONSUMED DURING THE REACTION. THE PHOTOREDUCED "LIGHT" HALF CELL AND A SIMILAR "DARK" CELL …
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ΠΟΛΥΗΛΕΚΤΡΟΝΙΚΗ ΦΩΤΟΑΝΑΓΩΓΗ ΤΩΝ ΕΤΕΡΟΠΟΛΥΑΝΙΟΝΤΩΝ P2W18O62 , PV2W10O40 , PV2MO10O40 . ΣΥΜΒΟΛΗ ΣΤΗ ΦΩΤΟΧΗΜΙΚΗ ΜΕΤΑΤΡΟΠΗ ΚΑΙ ΑΠΟΘΗΚΕΥΣΗ ΤΗΣ ΗΛΙΑΚΗΣ ΕΝΕΡΓΕΙΑΣ
… SUBSTANCES. IN THE CASE OF P2W18O626- THE PHOTOREDUCTION PROCEEDS STEPWISE AND LEADS TO THE FORMATION OF PRODUCTS THAT ARE ABLE, FROM A THERMODYNAMIC POINT OF VIEW, TO REDUCE WATER PRODUCING HYDROGEN H2-EVOLUTION INDEED TAKES PLACE WITH AND WITHOUT PT CATALYST. RATE CONSTANTS FOR THIS …
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Glutamine Phosphoribosyl Pyrophosphate Amidotransferase From Bacillus Subtilis: Iron-Sulfur Biochemistry and Enzymology
… sodium dithionite, but was reduced readily by photoreduction with 5-deazaflavin. Photoreduction of the native enzyme resulted in formation of the +1 redox state of the cluster. The reduced enzyme was EPR silent. Examination of the reduced enzyme by Mossbauer spectroscopy indicated the presence …
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The development of methods for the determination of selenium using spectrofluorimetric and ICP-MS techniques.
… supplements after microwave digestion and photoreduction of Se (VI) to Se (IV). The analytical precision in the concentration range 0. 5 - 1000 mug ml[-1] was better than 5%. Excellent agreement (r[2] = 0.9960) between the results of the fluorimetric and ICP-MS methods was obtained when a …
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Formation, characterization, and chemical reactions of free radicals in lignin
… a photostabilizer. The feasibility of applying photoreduction techniques to high- yield pulps was demonstrated. However, optimal experimental conditions for photoreduction of lignin in high-yield pulps have not been established yet.
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Ultrafast Dynamics of Flavin Cofactor in Photolyase/Cryptochrome Family
… conserved tryptophan triad. The ultrafast photoreduction dynamics of flavin cofactors in (6-4) photolyase was revealed by the femtosecond-resolved laser spectroscopy. Significantly, we found that the tryptophan triad has a reduction potential gradient modulated by the local protein …
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Development and testing of thin photocatalyst films
… described, as well as its use to investigate the photoreduction of oxygen by monitoring the formation and decay of transients associated with photogeneration of electrons in CdS paste films, TiO<sub>2</sub> paste films and TiO<sub>2</sub>-SEN films. These results are also compared against results …
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Síntese e caracterização de nanoestruturas de óxido de zinco por via úmida
… range of 1.32 to 3.16eV. The reactivity for CO2 photoreduction with H2 was evaluated for three samples by observing the differentiated production of methanol and acetone.
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Optofluidic Microreactors for Advanced Photocatalysis
… at low sample concentrations possible. The photoreduction of methyl viologen by carbon nanodots (CNDs) was studied and compared to theory by modelling reaction pathways. Oxidation states of cobaloximes, that are currently employed as molecular catalysts for solar hydrogen generation, could …
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Design and Engineering of Carbon Fixing Material Systems
… as formaldehyde. A mathematical analysis of CO₂ photoreduction revealed that carbon conversion and material growth rates which rival that of living plants can be obtained with currently employed photocatalytic materials under ambient conditions. This analysis revealed that the rate limiting step …
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Single-chain nanoparticle based catalysts
… cycloaddition (CuAAC), “click” reactions, or the photoreduction of azido groups to amines. The nanoparticles are shown to have significantly higher activity when compared to analogous small molecule catalysts. Structure-activity relationships and reaction mechanisms are studied with SCNPs of …
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Preparation and Characterization of Hydrophobic Graphene-Based Thin Films
… increase that is imparted by a new photoreduction process applied to the graphene oxide-based films is researched. From this, it was observed that the chemistry of the photoreduced films greatly differs from that of the thermally reduced films, including larger quantities of oxygen. …
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Design and synthesis of organic chromophores for imaging, lithography and organic electronics
… photophysical studies indicated that the photoreduction of RDX proceeded via a two-step electron-hydrogen atom transfer reaction, whereas PETN photoreduction proceeded via a threestep electron-proton-electron transfer sequence. A zinc analog was synthesized and found to display an 80- or …
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Photodecarboxylative additions to phthalimides and their application in the synthesis of AKS-186 and its analogues
… amino acid derived carboxylates solely underwent photoreduction whereas N-acylated amino acid readily furnished the desired addition products. To investigate the possibility of deactivation by certain electron-donors, various phthalimides with potential electron-donor substituents in the N-side …
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