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  • Chemistry  (5)
  • ENVIRONMENT POLLUTION  (1)
  • Venezuelan Indians  (1)
  • 1975-1979  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Biochemical characterization of a red cell UMP kinase variant found in the Warao Indians of Venezuela (1978)
    Springer
    Biochemical genetics 16 (1978), S. 1085-1092 
    Details
    ISSN: 1573-4927
    Keywords: uridine monophosphate kinase ; erythrocyte enzymes ; genetic polymorphism ; Michaelis constant ; Venezuelan Indians
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract UMPK 3 is a rare variant of the polymorphic enzyme of human red cells, uridine monophosphate kinase. This homozygote phenotype was detected among the Warao Indians of Venezuela. The UMPK 1 and UMPK 3 enzymes were partially purified following the method described by Tend et al. (1976). The biochemical and kinetic parameters of both variants were studied in crude hemolysates and in partially purified enzymes. A comparison was made with the results previously reported by Teng for UMPK 1 and UMPK 2, and it was concluded that UMPK 3 seems to resemble the other two allelic gene products in Km values for UMP, CMP, and ATP but differs from them in electrophoretic mobility, pH optimum, and thermal stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484529
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Darstellung, Eigenschaften, Struktur und Elektronenstruktur von Vanadiumpentasulfid (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 181-189 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation, Properties, Structure, and Electronic Structure of Vanadium PentasulfideNoncrystalline V2S5 with interesting surface properties obtained by thermal decomposition of (NH4)3VS4 was investigated by vibrational spectra, small angle and wide angle X-ray scattering, photoelectron spectroscopy, and thermogravimetry. Each vanadium is surrounded by six sulfur atoms at an average distance of 234 pm and has six vanadium atoms as next neighbours at 342 pm. The short range order corresponds to a strongly disordered C6(CdI2) structure (particle size not larger than 2500 pm). The results are reported and discussed.
    Notes: Das durch thermische Zersetzung aus (NH4)3VS4 erhaltene nichtkristalline V2S5, das interessante Oberflächeneigenschaften besitzt, wurde schwingungsspektroskopisch, mit Röntgenkleinwinkel- und -weitwinkelstreuung, photoelektronenspektroskopisch sowie thermogravimetrisch untersucht. Jedes Vanadium ist oktaedrisch von sechs Schwefelatomen im mittleren Abstand von 234 pm umgeben und hat bei 342 pm sechs weitere V-Atome als nächste Nachbarn. Die Nahordnung entspricht einem stark fehlgeordneten C6(CdI2)-Typ (Teilchengrößen geringer als 2500 pm). Die Ergebnisse werden mitgeteilt und diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784440121
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Einfache Darstellungsmethoden des einzigen bekannten Perthiometallats [(S2)2 Mo(S2)2Mo(S2)2]2-. Zur Kenntnis der Einheit {Mo2(S2)2}6+ (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 178-180 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Simple Preparation Methods of the Only Known Perthiometallate [(S2)2(Mo)S2)2 Mo(S2)2]2- · On the Moiety {Mo2(S2)2}6+Different aspects of the preparation of the only known perthiometallate [(S2)2Mo(S2)2Mo(S2)2]2- (a compound with the unusual coordination number (9) have been discussed. Simple preparation methods could be developed. A discussion of the properties of the stabilising central moiety {Mo2V(S2)2}6+ containing a metal-metal bond follows.
    Notes: Verschiedene Aspekte der Darstellung des einzigen bisher bekannten Perthiometallats [(S2)2Mo(S2)2Mo(S2)2]2- (einer Verbindung mit der außergewöhnlichen Koordinationszahl 9) werden diskutiert und einfache Darstellungsmethoden angegeben. Eine Diskussion der Eigenschaften der stabilisierend wirkenden zentralen Baueinheit {Mo2V(S2)2}6+, die eine Metall-Metall-Bindung aufweist, schließt sich an.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784440120
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  • 4
    Electronic Resource
    Electronic Resource
    Interaction of MnO3F with HF and HCl: Matrix-isolation infrared spectral studies. The vibrational spectrum of MnO3Cl (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 442 (1978), S. 230-234 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Wechselwirkung von MnO3F mit HF und HCl: Untersuchung durch Matrix -Isolations-IR-Spektroskopie. Das Schwingungsspektrum von MnO3ClDie Wechselwirkung von MnO3F mit HF und HCl wurde mit Hilfe der IR-Spektren der matrix-isolierten Substanzen untersucht. Gasförmiges MnO3F reagiert mit HCl zu MnO3Cl, und die Bildung von Komplexen des Typs MnO3F—HF ist wahrscheinlich. Isotopendaten (35/37Cl) aus Matrix-Spektren, bisher unbekannte Grundschwingungen (aus dem Festkörperspektrum) und eine Schwingungsanalyse von MnO3Cl werden mitgeteilt.
    Notes: The interaction MnO3F with HF and HCI was studied by means of matrix-isolation infrared spectroscopy. Gaseous MnO3F reacts with HCl forming MnO3Cl; some evidence for the probable existence of MnO3F—HF complexes is also presented. Isotopic data (35/37Cl) obtained from matrix-isolation spectra unknown fundamentals (from the spectrum of the solid substance) as well as a vibrational analysis are reported for MnO3Cl.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784420131
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photolysis of pentacarbonyl(selenocarbonyl)chromium(0), Cr(CO)5(CSe), in an Argon matrix at 20 K (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 446 (1978), S. 17-22 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photolyse von in einer Ar Matrix bei 20 K isoliertem Cr(CO)5(CSe)Durch UV-Photolyse von Cr(CO)5(CSe), das in einer Ar-Matrix bei etwa 20 K isoliert wurde, entstehen zwei isomere Formen von Cr(CO)4(CSe) und Cr(CO)6 sowie CO (zu weiteren Details vgl. Abstract).
    Notes: U. v. photolysis (254 and 366 nm) of Cr(CO)5(CSe) isolated in an argon matrix at ca. 20 K produces a mixture of two isomeric forms of Cr(CO)4(CSe), Cr(CO)6 and molecular CO. The two Cr(CO)4(CSe) isomers are assigned square pyramidal geometries (CSe group axial, C4v symmetry; CSe group equatorial, Cs symmetry) by comparison with the results from a previous matrix isolation i.r. study of the products formed in the u.v. photolysis of the analogous thiocarbonyl complex, Cr(CO)5(CS). On further irradiation of the Cr(CO)4(CSe) species with visible light (λ 〉 425 nm), the parent Cr(CO)5(CSe) molecule is regenerated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784460102
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  • 6
    Electronic Resource
    Electronic Resource
    On the preparation of binuclear S, S bridged molybdenum(V) complexes crystal and molecular structure of [Mo2S4(Et2dtc)2] (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 118-124 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Über die Darstellung S, S-verbrückter Zweikern-Molybdän(V)-Komplexe. Kristall- und Molekularstruktur von [Mo2S4(Et2dtc)2]MoO42- wird von Diäthyldithiocarbaminat in wäßriger Lösung reduziert. Die zentrale Einheit MoO2S22+ des gebildeten [Mo2VO2S2(Et2dtc)2] weist eine große Bildungstendenz auf. [Mo2VS4(Et2dtc)2] läßt sich aus [Mo2V(S2)6]2- erhalten (Röntgenstrukturkturdaten vgl. Abstract).
    Notes: MoO42- is reduced by diethyldithiocarbamate (Et2dtc-) on prolonged digestion in aqueous medium whereby the complex [Mo2VO2S2(Et2dtc)2] is formed. The central moiety Mo2O2S22+ has a high formation tendency. When [Mo2V(S2)6]2- is refluxed with Et2dtc- in ethanol, [Mo2VS4- (Et2dtc)2] is formed, the X-ray crystal structure of which has been determined (space group P212121, a = 10.550(2) Å, b = 13.820(5) Å, c = 14.723(12) Å, dc = 1.90 g · cm3-, Z = 4). The Mo—Mo distance of the diamagnetic compound is 2.817(2) Å and the average Mo=St distance 2.099(4) Å.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794540118
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  • 7
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    Unknown
    Noise data for a twin-engine commercial jet aircraft flying conventional, steep, and two-segment approaches (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Center-line noise measurements of a twin-engine commercial jet aircraft were made during steep landing approach profiles, and during two-segment approach profiles for comparison with similar measurements made during conventional approaches. The steep and two-segment approaches showed significant noise reductions when compared with the -3 deg base line. The measured noise data were also used to develop a method for estimating the noise under the test aircraft at thrust and altitude conditions typical of current landing procedures and of landing procedures under development for the Advanced Air Traffic Control System.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TN-D-8441 , L-11303
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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