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  • 1
    Electronic Resource
    Electronic Resource
    Detailed experimental and theoretical analysis of chiral discrimination: Enantioselective binding of R/S methyl mandelate by β-cyclodextrin (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 8 (1996), S. 341-350 
    Details
    ISSN: 0899-0042
    Keywords: chiral discrimination ; β-Cyclodextrin ; complexation ; enantiodiscrimination ; computational chemistry ; molecular modeling ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enantiodifferentiation of methyl mandelate by β-Cyclodextrin in the liquid phase is explored in detail. Temperature dependent studies using a β-cyclodextrin chiral stationary phase provided differential binding enthalpies and entropies. NMR studies revealed where around the host molecule the guest tends to reside. Molecular dynamics simulations correctly predict the retention order and provide an atomistic account of how chiral discrimination takes place. It is found that short range dispersion forces rather than long range coulombic forces are responsible for both complexation and for enantiodiscrimination. The intermolecular hydrogen bonds are not discriminating and the idea that a tight fit of included species within a cyclodextrin cavity be a requirement for chiral discrimination is questioned. © 1996 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Computer assistance in multiparameter flow microphotometry of mammalian cells (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 18 (1976), S. 1057-1074 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Flow system technology enables the biological and medical experimenter to investigate the distribution spectra of various cellular characteristics separately or in parameter combination on the basis of ultrarapid single cell measurements. A typical rate of recognition is about 1000 to 5000 cells per second and the precision of measurements and their statistical relevance has been previously unobtainable. According to the approach of the multiparameter analysis and high data rate, computer assistance in flow system technology is given primary consideration. In this study three different kinds of software controlled modes in data acquisition are demonstrated: normal acquisition and linear accumulation of single parameters, spectra accumulation of two correlated parameters of each single cell and documentation as linear, two- or three-dimensional distribution pattern, and linear accumulation of two correlated parameters simultaneously with their actual signal-to-signal ratio. A first attempt to analyze distribution spectra was the application of the entropy of the structure routinely used in cybernetics. This function seems to be a measure for determining the degree of synchrony in an appropriate pretreated cell population. A special mathematical strategy has been applied to the linear spectra of cellular DNA content, whose advantage is the quantitative extraction of the fractions concerning the various phases of the life cycle cells. The validity of this special curve fitting procedure has been proven on various experimental cell populations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260180804
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  • 3
    Electronic Resource
    Electronic Resource
    Über Zweistoffsysteme mit Germanium. I. Germanium/Aluminium, Germanium/Zinn und Germanium/Silicium (1939)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 241 (1939), S. 305-323 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es wird gezeigt, daß die Untersuchung von Systemen, die Halbmetalle enthalten, f¨r die Aufklärung feinerer Affinitätswirkungen von Bedeutung ist.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19392410401
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  • 4
    Electronic Resource
    Electronic Resource
    Über Zweistoffsysteme mit Germanium. II. Germanium/Arsen, Germanium/Antimon, Germanium/Wismut (1940)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 244 (1940), S. 205-223 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Zustandsdiagramme der Zweistoffsysteme Germanium/Arsen, Germanium/Antimon und Germanium/Wismut wurden untersucht.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19402440211
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Kenntnis der Allotropie des Arsens (1939)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 242 (1939), S. 138-144 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die magnetische Suszeptibilität des kristallisierten Arsens gemessen. Der in der Literatur angegebene Wert (χAtom = -23.10-6) gilt nicht für kristallisiertes, sondern für amorphes Arsen. Das rhomboedrische Arsen besitzt vielmehr χAtom-Werte von -5,5 ± 1.10-6 bei Zimmertemperatur und + 1 ± 1,5 ·10-6 bei - 183°.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19392420204
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  • 6
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur von Li5Ga4 (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 474 (1981), S. 221-225 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Li5Ga4Li5Ga4 has been established as further, hitherto unknown phase in the LiGa system. The new compound crystallizes in the trigonal system (P3m1 - D3d3) with a = 437.5 ± 0.2 pm, c = 825.7 ± 0.2 pm, c/a = 1.885. The structure is strongly related to those of LiGa and Li3Ga2.
    Notes: Li5Ga4, eine bisher im Li/Ga-System noch nicht beschriebene Verbindung, kristallisiert trigonal (P3m1 - D3d3) mit a = 437,5 ± 0,2 pm und c = 825,7 ± 0,2 pm (c/a = 1,885). Die Struktur zeigt enge Bezüge zu denen der Nachbarphasen LiGa und Li3Ga2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814740323
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  • 7
    Electronic Resource
    Electronic Resource
    Über den Einfluß der Substituenten auf die chemische Reaktivität, IV. Mitteil.III. Mitteil A. 574, 212 [1951].: Über das Verhalten der Diazoniumsalze gegen UV-Licht (1952)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 85 (1952), S. 993-999 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diazoniumsalze werden in alkoholischer Lösung bei Bestrahlung mit UV-Licht im Gegensatz zur thermischen Zersetzung (Ätherbildung) bevorzugt reduktiv desaminiert. In Isopropanol ist die Ätherbildung im UV-Licht praktisch völlig unterdrückt; die reduktive Desaminierung wird zur Hauptreaktion. Ein übersichtlicher Substituenteneinfluß ist bei der Photolyse nicht zu erkennen. Durch Auslösung der Polymerisation von Acrylnitril sowie durch die völlige Unterdrückung der reduktiven Desaminierung durch typische Radikalfänger wie molekularen Sauerstoff und p-Chinon wird auf präparativem Wege der Beweis für den radikalischen Chemismus des reduktiven Austausches von NH2 gegen H erbracht. Die Ätherbildung verläuft über polare Zwischenstufen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19520851103
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  • 8
    Electronic Resource
    Electronic Resource
    Zum Verhalten von Diazonium-Salzen gegen tertiäre aliphatische AmineHerrn Prof. Dr. E. Weitz gewidmet zur Feier seines 70. Geburtstages.Teil der Dissertat. H. Stöhr, Universität Frankfurt/M., 1952. (1953)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 86 (1953), S. 1066-1071 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aryl-diazonium-Salze werden in oxygruppenhaltigen Lösungsmitteln durch Triäthylamin in die Aryl-diazohydroxyde umgewandelt, welche homolytisch zerfallen und je nach der Zusammensetzung des Primärverbandes unter reduktiver Desaminierung, Auslösung der Polymerisation oder “Verharzung” abreagieren. Durch die Auslösung der Polymerisation und die Autoxydation des reagierenden Systems ist der Zerfall über “Durchgangsradikale” gesichert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19530860905
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  • 9
    Electronic Resource
    Electronic Resource
    Die Einwirkung von Triphenylphosphin auf Diazonium-SalzeHerrn Prof. Dr. E. Weitz zum 70. Geburtstag gewidmet. (1953)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 86 (1953), S. 1073-1076 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diazonium-Salze reagieren mit 2 Moll. Triphenylphosphin über die Stufe nicht faßbarer, rotgefärbter Zwischenverbindungen (I) in sehr guter Ausbeute zu Triphenyl-arylhydrazyl-phosphonium-Salzen (II), die bei der sauren Hydrolyse praktisch quantitativ in Arylhydrazine und Triphenylphosphin-oxyd zerfallen. Hinsichtlich Anwendungsbereich, Leichtigkeit der Durchführung und Ausbeute ist dieses Verfahren den bekannten Methoden zur Darstellung von Arylhydrazinen aus Diazonium-Salzen gleichwertig.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19530860907
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  • 10
    Electronic Resource
    Electronic Resource
    Ueber methylirte Dipyridyle (1893)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 48 (1893), S. 1-16 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.18930480101
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