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  • Articles  (23)
  • Chemistry  (22)
  • General Chemistry  (6)
  • Gonadotrops
  • Liquid chromatography
  • Magnetism
  • Seismology
  • 2000-2004  (2)
  • 1980-1984  (5)
  • 1955-1959  (10)
  • 1940-1944  (6)
  • 1935-1939
  • 2000  (2)
  • 1983  (5)
  • 1959  (10)
  • 1943  (6)
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  • Articles  (23)
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Years
  • 2000-2004  (2)
  • 1980-1984  (5)
  • 1955-1959  (10)
  • 1940-1944  (6)
  • 1935-1939
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  • 11
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Time-resolved fluorescence depolarization was applied to investigate the dynamics of low-molecular-weight polyethylene glycols (MW 150, 400, 1000, 4000) labeled by fluorescein-isothiocyanate. The analysis of measurements revealed considerable flexibility of the polymer chain. To interpret the observed dependence of the relaxation time of polarization anisotropy on the molecular weight of the polymer, a simple freely-hinged dumbbell model was developed. The properties of the model were investigated by computer experiments. The model was found to account well for the measured data.
    Additional Material: 7 Ill.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 31 (1959), S. 796-798 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es wird ein Durchflußregler beschrieben, bei dem eine federnd abgestützte Kreisscheibe sich in einem konischen Rohr unter dem Einfluß der Strömung so einstellt, daß sie einen gewünschten Druckverlust hervorruft, der rückwirkend den Durchsatz auf einen stets gleichbleibenden Wert korrigiert.
    Additional Material: 6 Ill.
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  • 13
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 390-393 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: L'acide ms-inositol-1(3)-phosphorique a été isolé sous forme de sel de cyclohexylamine cristallisé, à partir des mélanges formés soit par hydrolyse acide partielle du diester cyclique ms-inositol-1(3), 2-phosphorique, soit par traitement chlorhydrique de l'acide ms-inositol-2-phosphorique. II s'obtient également, à côté d'acide ms-inositol-2-phosphorique, à partir du 1 (3),4,5,6-tétra-O-acétyl-ms-inositol, par phosphorylation. Sa transposition par traitement acide a été étudiée.
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  • 14
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Les compositions des phospholipidcs provenant de cultures de Schizosaccharomyces Pombe inhibées ou non par un anti-inositol, l'isomytilitol, ont été comparées. Les teneurs en phospholipides à inositol restent approximativcment les mêmes. Dans les cultures inhibées, se produit la synthèse en quantité considérable de phospholipides à isomytilitol non pas à la place, mais à côté de celle des phospholipides normaux à ms-inositol. Une explication de ces phénomènes a été proposée.
    Additional Material: 1 Ill.
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  • 15
    ISSN: 0935-6304
    Keywords: μLC ; FID ; LC-FID ; carbohydrates ; amino acids ; alcohols ; phosphonic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The potential of the on-line coupling of microcolumn liquid chromatography (μLC) using aqueous eluents with a flame ionization detector (FID) was evaluated. An eluent-jet interface was modified to allow the efficient introduction of the eluent into the FID. The potential of the method is demonstrated by the μLC-FID determination of lower alcohols and bis(2-hydroxyethylthio)alkanes on porous and non-porous stationary phases, respectively. Flow injection analysis (FIA)-FID experiments with highly polar, thermolabile, semi-volatile and non-volatile compounds like amino acids, organic acids, alkylphosphonic acids, and carbohydrates showed the developed configuration to be a promising approach for the detection of a wide range of analytes. Compared with a nebulization interface, the eluent-jet interface showed 4-10 times higher peaks for citric acid. Detection limits by FIA for all compounds were in the range of 0.2-5 ng injected. With ribose as test compound, plots of peak height vs. amount injected showed good linearity (r2 〉 0.999) in the range of 75-12,000 μg/mL. The repeatability showed relative standard deviations of less than 5%.
    Additional Material: 7 Ill.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. I 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 17
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1557-1572 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The psychotropically active principles of the Mexican hallucinogenic fungus Psilocybe maxicana HEIM have been isolated and obtained in crystalline form. The two new substances, which have been called psilocybin and psilocin, are present in the fruit bodies, the artificially cultivated mycelium and in the sclerotia. The dried mushroom contains 0.2 to 0.4 per cent psilocybin. Psilocin is present, at the most, in trace amounts only.
    Additional Material: 6 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Plant/Operations Progress 2 (1983), S. 137-140 
    ISSN: 0278-4513
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 10 Ill.
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 298 (1959), S. 22-33 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: From the corresponding chlorides and ammonia, the nitrides of boron, aluminum, gallium, and indium have been prepared in coarsely crystalline state by means of the van Arkel - de Boer process. The nitrides being extremely resistant against chemical reagents are semiconductors; the electric conductivities increase from BN, AIN, GaN to InN.
    Notes: Aus den entsprechenden Chloriden und Ammoniak werden die Nitride von Bor, Aluminium, Gallium und Indium in kompakten Zustand durch Anwendung des Aufwachsverfahrens erhalten. Es sind chemisch außerordentlich resistente Körper. Ihre elektrische Leitfähigkeit nimmt in der Reihenfolge BN, AIN, GaN, InN zu; InN ist bereits ein guter Leiter. Sämtliche Nitride besitzen Halbleitercharakter.
    Additional Material: 8 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 498 (1983), S. 153-160 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions on the Thermal Behaviour of Sulfates. VI. On the Chemical Transport of CuSO4, Cu2OSO4, and CuOA powder of anhydrous CuSO4 can be prepared by heating CuSO4 · 5 H2O in air or in an argon atmosphere. In the same way it is possible to get a powder of Cu2OSO4. But up to now, it was difficult to get crystals of CuSO4 and there was no method known to synthesize crystals of Cu2OSO4. Investigations concerning chemical transport reactions of anhydrous heavy metal sulfates showed, that it is possible to get well formed crystals of CuSO4 and Cu2OSO4 by deposition from a vapour phase. As transport agents for CuSO4, Cl2 and HgCl2 are especially suitable. Less appropriate are HCl, NH4Cl, and I2.The chemical vapor deposition of Cu2OSO4 proceeds well with HgCl2. In course of these investigations we recognized, that for CuO in addition to the well approved transport agents also Cl2, HgCl2 or I2 (NH4Cl less suitable) can successfully be used.
    Notes: Wasserfreies CuSO4 ist in Pulverform durch thermischen Abbau der Hydrate leicht zugänglich, pulverförmiges Cu2OSO4 läßt sich dementsprechend aus CuSO4 darstellen. Kristalle waren dagegen bisher von CuSO4 nur sehr schwierig und von Cu2OSO4 noch nicht synthetisch zu gewinnen. Wie sich im Rahmen einer Untersuchung zum chemischen Transport wasserfreier Schwermetallsulfate zeigte, sind gut ausgebildete Kristalle von CuSO4 und Cu2OSO4 durch Abscheidung aus der Gasphase zugänglich. Als Transportmittel für CuSO4 sind besonders Cl2 und HgCl2 geeignet, weniger brauchbar sind HCl, NH4Cl oder I2. Das Oxidsulfat ist mit HgCl2 und NH4Cl, weniger gut mit I2 zu transportieren. Dabei fanden wir, daß für CuO außer den dafür bereits erprobten Transportmitteln auch Cl2, HgCl2 und I2 (NH4Cl weniger gut) verwendbar sind.
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