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  • 1985-1989  (32)
  • 1987  (32)
  • Chemistry  (29)
  • Nitrate reductase  (2)
  • Computational Chemistry and Molecular Modeling
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Years
  • 1985-1989  (32)
Year
  • 1
    ISSN: 1432-072X
    Keywords: Rhodobacter capsulatus ; Periplasmic enzymes ; Nitrate reductase ; Trimethylamine-N-oxide/dimethylsulphoxide/chlorate reductase ; Molybdenum cofactor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The periplasmic dissimilatory nitrate reductase from Rhodobacter capsulatus N22DNAR+ has been purified. It comprises a single type of polypeptide chain with subunit molecular weight 90,000 and does not contain heme. Chlorate is not an alternative substrate. A molybdenum cofactor, of the pterin type found in both nitrate reductases and molybdoenzymes from various sources, is present in nitrate reductase from R. capsulatus at an approximate stoichiometry of 1 molecule per polypeptide chain. This is the first report of the occurrence of the cofactor in a periplasmic enzyme. Trimethylamine-N-oxide reductase activity was fractionated by ion exchange chromatography of periplasmic proteins. The fractionated material was active towards dimethylsulphoxide, chlorate and methionine sulphoxide, but not nitrate. A catalytic polypeptide of molecular weight 46,000 was identified by staining for trimethylamine-N-oxide reductase activity after polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate. The same polypeptide also stained for dimethylsulphoxide reductase activity which indicates that trimethylamine-N-oxide and dimethylsulphoxide share a common reductase.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Keywords: Nitrate reductase ; cDNA expression cloning ; Tobacco ; Sequence ; Cytochrome b5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Messenger RNAs encoding the nitrate reductase apoenzyme from tobacco can be translated in a cell-free system. Poly(A)+ mRNA fractions from the 23-32 S area of a sucrose gradient were used to build a cDNA library in the expression vector λgt11 with an efficiency of cloning of approximately 104 recombinants/ng mRNA. Recombinant clones were screened with a rabbit polyclonal antibody directed against the corn nitrate reductase, which cross reacts specifically with the nitrate reductases from dicotyledons. Among 240000 recombinant plaques, eight clones were isolated containing inserts of sizes ranging from 1.6 kb to 2.1 kb and sharing sequence homologies. Seven of these clones contained a common internal 1.6 kb EcoRI fragment. The identity of these clones was confirmed as follows. A fusion protein of 170 kDa inducible by IPTG and recognized by the rabbit nitrate reductase antibody was expressed by a lysogen derived from one of the recombinants. The antibodies binding the fused protein were eluted and shown to be inhibitory to the catalytic activity of tobacco nitrate reductase. Two monoclonal antibodies directed against nitrate reductase were also able to bind the hybrid protein. The 1.6 kb EcoRI fragment was sequenced by the method of Sanger. The open reading frame corresponding to a translational fusion with the β-galactosidase coding sequence of the vector shared strong homology at the amino acid level with the heme-binding domain of proteins of the cytochrome b5 superfamily and with human erythrocyte cytochrome b5 reductase. When the 1.6 kb EcoRI fragment was used as a probe for Northern blot experiments a signal corresponding to a 3.5 kb RNA was detected in tobacco and in Nicotiana plumbaginifolia mRNA preparations but no cross-hybridization with corn mRNAs was detected. The probe hybridized with low copy number sequences in genomic blots of tobacco DNA.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 680-689 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eight cyclic triamines with ring sizes between 9 and 13 were synthesized by the p-toluenesulfonate method. The open-chain triamines bis(2-aminoethyl)amine (dien) and bis(3-aminopropyl)amine (diprop) were used as starting materials. In some cases, the corresponding dimeric cyclic hexaamines have been isolated and characterized as major by-products. The complexation of Cu(I) by the triamines has been studied potentiometrically in CH3CN/H2O. All ligands L form ternary complexes [Cu(CH3CN)L]+. The corresponding association constants vary between 1011 and 107, decreasing with increasing ring size. In addition, complexes [Cu(CH3CN)yLH]2+, y = 1 or 2, are found as less important species with maximum concentrations of 7 to 50%.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Gloeosporone, the germination self-inhibitor from the fungus Colletotrichum gloeosporioides f.sp. jussiaea, is shown by spectroscopic data and X-ray analysis to have the constitution and relative configuration as shown in Formula 2 (either (1S,6R,12R)-1-hydroxy-6-pentyl-5,15-dioxabicyclo[10.2.1]pentadecan-4,13-dione or its enantiomer), rather than the previously assigned constitution 1.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 11-15 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction of MHCl(CO)[P(iPr)3]2, (1, 2) and MHCl-(CO)[PMe(tBu)2]2 (5, 6) with NaBH4 in methanol lead to the octahedral compounds MH(η2-BH4)(CO)[P(iPr)3]2, (3, 4) and MH(η2-BH4)(CO)[PMe(tBu)2]2 (7, 8), which posses a rigid structure in solution only at low temperatures. Above ca. -30°C exchange processes take place which involve the bridging hydrogen atoms and the terminal hydrogens attached to boron but not the metal hydride ligand. The compounds 3 and 4 react with Lewis bases L such as CO, P(OMe)3, PMe3, and P(iPr)3 to form dihydridoruthenium(II) and -osmium(II) complexes MH2(CO)-(L)[P(iPr)3]2 (9 - 15). In the reaction of 4 with methanol under reflux, the tetrahydridoosmium(IV) compound OsH4(CO)[P(i-Pr)3]2 (16) is produced.
    Notes: Die Reaktionen von MHCl(CO)[P(iPr)3]2, (1, 2) und MHCl-(CO)[PMe(tBu)2]2 (5, 6) mit NaBH4 in Methanol führen zu den oktaedrischen Verbindungen MH(η2-BH4)(CO)[P(iPr)3]2, (3, 4) und MH(η2-BH4)(CO)[PMe(tBu)2]2 (7, 8), die in Lösung nur bei tiefer Temperatur eine starre Struktur besitzen. Oberhalb von ca. -30°C finden Austauschprozesse statt, in welche die Brücken-H-Atome und die am Bor endständig gebundenen H-Atome, nicht jedoch der Metall-Hydrid-Ligand, einbezogen sind. Die Verbindungen 3 und 4 reagieren mit Lewis-Basen L wie CO, P(OMe)3, PMe3 und P(iPr)3 zu Dihydridoruthenium(II)- und -osmium(II)-Komplexen des Typs MH2(CO)(L)[P(iPr)3]2 (9-15). Bei Reaktion von 4 in Methanol unter Rückfluß entsteht die Tetrahydridoosmium(IV)-Verbindung OsH4(CO)[P(iPr)3]2 (16).
    Additional Material: 2 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 887-898 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Derivatives of silicic acid of the type Si6O5R18 and Si8O7R18 (R = Cl, OCH3, and OC2H5) as well as bicyclic Si8O9(OC2H5)14 were isolated and characterized by 29Si NMR. The spin-lattice-relaxation and the nuclear Overhauser enhancement factor of the esters were determined between 273 and 343 K. The temperature dependency of the dipolar contribution to the longitudinal relaxation time gave an energy of activation for the segmental motion of the siloxane skeleton of about 10 kJ/mol which is independent of the kind of building unit.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 962-968 
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An artisanal static process for protein enrichment of cassava by solid-state fermentation, developed in laboratory and tested on pilot units in Burundi (Central Africa), provides enriched cassava containing 10.7% of dry matter protein versus 1% before fermentation. Cassava chips, processed into granules of 2-4-mm diameter, are moistened (40% water content) and steamed. After cooling to 40°C, cassava is mixed with a nutritive solution containing the inoculum (Rhizopus oryzae, strain MUCL 28627) and providing the following per 100 g dry matter: 3.4 g urea, 1.5 g KH2PO4, 0.8 g MgSO4·7H2O, and 22.7 g citric acid. For the fermentation, cassava, with ca. 60% moisture content, is spread in a thin layer (2-3 cm thick) on perforated trays and slid into an aerated humidified enclosure. The incubation lasts ± 65 h. The production of protein enriched cassava is 3.26 kg dry matter/m2 tray. The effects of the variation of the nutritive solution composition and the inoculum conservation period on the protein production are equally discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 503-505 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 26 (1987), S. 1207-1225 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Prior to availability of the crystal structure of the complex, we evaluated models of the complex between porcine pancreatic elastase and a t-Boc-Val-derived benzoxazinone inhibitor. Models of the noncovalent and covalent complex were generated using computer graphics and each model was subjected to energy minimization using molecular mechanics. After the crystal structure became available, we found that the model with the lowest energy was in good agreement with the crystal structure, except for the position of the His57 side chain. Permissible conformations of the inhibitor were based on information from x-ray crystal structures and an earlier conformational energy investigation of t-Boc-amino acids. We did not, however, limit ourselves to these conformations. The conformation of the inhibitor in the lowest energy model and crystal structure, was not similar to any of the minimum-energy conformations of t-Boc-amino acids. This suggests that limiting proposed binding modes only to the lowest energy conformations of a ligand (prior to binding) may sometimes unfairly bias the procedure.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 21 (1987), S. 59-69 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Werkstoffe auf der Basis von synthetischen oder natürlichen Polymeren sind in vielen Bereichen des zivilisierten Lebens selbstverständlich geworden. Das liegt unter anderem an den typischen Eigenschaften der Polymeren, z. B. leichte Formgebung, geringes spezifisches Gewicht und oft niedriger Preis, die ihnen im Vergleich zu den „klassischen“ Werkstoffen wie Holz, Metall und Keramik Vorteile verschaffen.Besonders auf dem Gebiet der Konstruktionswerkstoffe verdrängen deshalb Polymere andere Werkstoffe aus immer mehr Anwendungsbereichen. So ist z. B. die Innenausstattung von Personenkraftwagen in den letzten Jahren fast ausnahmslos eine Domäne der polymeren Werkstoffe geworden. Der vorliegende Artikel über Grundlagen und Anwendungen von „Polymer-Legierungen“ ist der erste einer Serie von Aufsätzen, die sich unter der gemeinsamen überschrift „Polymere Werkstoffe“ mit den vielseitigen Aspekten dieser Werkstoffklasse befassen werden und in zwangloser Folge erscheinen sollen.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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