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  • 1995-1999  (2)
  • 1980-1984  (11)
  • 1950-1954  (1)
  • Chemistry  (12)
  • Computational Chemistry and Molecular Modeling  (2)
  • Human mortality
  • Inorganic Chemistry
  • 1
    Electronic Resource
    Electronic Resource
    Uranium binding by emulsan and emulsanosols (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 1725-1735 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Emulsan, the extracellular bioemulsifier of Acinetobacter RAG-1, bound up to 0.9 μm of uranium per 1 mg emulsan. The dissociation constant for the emulsan-uranium complex, KappI was 1.2 × 10-4M. Much larger amounts of uranium were bound to emulsan when the biopolymer occurred on hexadecane-water interfaces. Under these conditions, more than 3.5 µm uranium were bound per 1 mg emulsan and the dissociation constant KappII was 5.1 × 10-5M. At pH 2, more than 90% of the uranium bound to emulsan on the hexadecane-water interface was desorbed, while less than 10% bioemulsifier was released from the interface. The different binding parameters of emulsan when free in solution and while adsorbed onto the hexadecane water interface are discussed in view of potential applications and as a model system for studying the properties of an extracellular amphipathic polymer bound to a hydrophobic surface.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250704
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of hydrocarbon-in-water emulsions stabilized by Acinetobacter RAG-1 emulsan (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 281-292 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Emulsan is a polymeric extracellular emulsifying agent produced by Acinetobacter RAG-1. Hydrocarbon-in-water emulsions (Vf of hydrocarbon of 0.01-0.10) were stabilized by small quantities of emulsan (0.02-0.2 mg/mL). Although both aliphatic and aromatic hydrocarbon emulsions were stabilized by emulsan, mixtures containing both aliphatics and aromatics were better substrates for emulsan than the individual hydrocarbon by themselves. The emulsan remained tightly bound to the hydrocarbon even after centrifugation as determined by (a) residual emulsan in the aqueous phase and (b) the fact that the resulting “cream” readily dispersed in water to reform stable emulsions. With hexadecane-to-emulsan weight ratio of 39 and 155, the noncoalescing oil droplets had average droplet diameters of 2.0 and 4.0 μm, respectively. Dialysis studies showed that the water-soluble dye Rhodamine B adsorbed tightly to the interface of hexadecane-emulsan droplets although the dye did not bind to either hexadecane or emulsan alone. At saturating concentrations of dye, 2.2 μmol of dye were bound per mg emulsan.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240203
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical solution of liquid-phase multicomponent adsorption in fixed beds (1982)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 28 (1982), S. 765-772 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A generalized mathematical model is developed to describe the process of multicomponent adsorption on activated carbon in fixed beds. Numerical, finite difference, solutions for the adsorption of binary, and ternary organic mixtures are shown to satisfactorily match previously published experimental data.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690280510
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  • 4
    Electronic Resource
    Electronic Resource
    On the precipitation of proteins by polymers: The hemoglobin - polyethylene glycol system (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 2761-2779 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of polyethylene glycol (PEG) of MW 6000 to solutions of oxy- and deoxyhemoglobins results in an increase in the thermodynamic activity of these proteins. This in turn results, when PEG concentration is high enough, in phase separation into two phases; a protein-rich, PEG-poor phase and a PEG-rich, protein-poor phase. With increasing PEG concentration, the protein-rich amorphous phase becomes metastable and is converted into a well-defined crystalline or polymer phase. The logarithm of protein solubility is a linear function of PEG content up to a protein concentration of 150 g/L because the expression for the activity coefficient can, up to this concentration range, be approximated by a logarithmic function. Curvature appears at higher protein concentrations. Activities obtained by extrapolation from linear portions of the function, showing an unchanged, well-defined crystalline state, yield an activity coefficient for the saturated PEG-free protein solution in agreement with the appropriate values obtained from hard-sphere calculations of excluded volume [Ross, P. D. & Minton, A. P. (1977) J. Mol. Biol. 112, 437-452]. Solutions containing two hemoglobin species showed cocrystallization of the hemoglobins with a triple point where two crystal forms can be shown to coexist.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360231206
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  • 5
    Electronic Resource
    Electronic Resource
    Fluctuations of protein structure as expressed in the distribution of hydrogen exchange rate constants (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 1049-1068 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen exchange kinetics of proteins provide information about the dynamics of their structure. The interpretation of experiments has been limited by difficulty in identifying individual rate constants. In order to invert the kinetic data, and to gain information about the individual reacting sites, we introduce a Laplace inversion technique and obtain the distribution function of rate constants by which the intricate reaction proceeds. A series of carefully overlapped experiments were performed on lysozyme at 25°C, an exchange profile obtained, and a distribution function extracted. This function was composed of a product of two terms, indicating two parallel pathways. The first, a power-law term, was attributed to exchange from the native state. This part of the distribution function thus describes the scope of the conformational fluctuations in proteins at constant temperature and pressure. The second, an exponential, was seen to be associated with the pathway involving thermal unfolding and subsequent free exchange with the solvent. The influence of trichlorethanol and glycerol on the total distribution function was measured. Trichloroethanol selectively increased the contribution from the thermal unfolding pathway, whereas glycerol, besides decreasing this type of contribution, increased the width of the distribution function attributed to structural fluctuations.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1980.360190509
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear viscoelastic response in two dimensions - numerical modeling and experimental verification (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 1409-1416 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Recently we developed a nonlinear viscoelastic constitutive model which called the Phases Model (PHM) [10]. The main advantages of the PHM over existing nonlinear viscoelastic models are that it lends itself to simple, straightforward calibration of the material functions, and that it is naturally suitable to step-by-step computer simulation. In this paper we apply the PHM to two dimensional (2-D) situations. To this end, we've developed a 2-D finite difference code in cylindrical geometry which is based on the PHM. We demonstrate the validity of our modeling by applying the code to a 2-D set-up developed for this purpose. The 2-D specimen is in the form of a disc of the test material compressed between two rigid metal anvils by a velocity-controlled Instron machine. We monitor the response of the viscoelastic disc in terms of the overall axial force history, and the axial stress component at the disc center. We get good agreement between theory and experiment.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760241807
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of cured polystyrylpyridine by model compoundsPresented at the 1979 Pacific Conference on Chemistry and Spectroscopy in Pasadena, California on 10-12 October 1979. (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1975-1987 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The crosslinking or curing reaction of polystyrylpyridine (PSP) has been studied by means of thermal reactions of its model compounds. Compounds 2,6-distyrylpyridine, 4-stilbazole (4-styrylpyridine), and deuterated 4-stilbazole were pyrolyzed at 200-325°C both in air and under vacuum in a sealed tube. The major pyrolysis products were diarylethane and stilbene, and were characterized by gas chromatography-mass spectrometry. Major dimeric products were naphthalene or quinoline derivatives. Mechanisms for the pyrolysis are suggested, and a crosslinked structure for cured PSP is proposed based on the thermal reaction products of model compounds.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260621
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  • 8
    Electronic Resource
    Electronic Resource
    Über die graphische Darstellung des Verdampfungsgleichgewichtes idealer ternärer Systeme (1954)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 26 (1954), S. 325-326 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der Literatur werden mit Destillationslinien zwei verschiedene Arten von Linien bezeichnet, durch welche das Verdampfungsgleichgewicht dargestellt werden kann. Für beide Kurvenarten werden Gleichungen angegeben und die Besonderheiten diskutiert, die sich für solche ideale Systeme ergeben, bei denen die Quotienten aus den Dampfdrucken der Komponenten im betrachteten Gebiet als temperaturunabhängig angesehen werden können.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330260605
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  • 9
    Electronic Resource
    Electronic Resource
    Totalsynthese optisch aktiver Steroide, XX. Darstellung eines 7α-Methylöstratriens durch stereoselektive Methylierung von Östratrien-6-on (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 459-471 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Total Synthesis of Optically Active Steroids, XX1).  -  Synthesis of 7α-Methylestratriene by Stereoselective Methylation of Estratrien-6-one6-Cyanoestratriene 15 was oxidized by oxygen in a two-phase system to the 6-oxoestratriene 13. This is stereoselectively alkylated to the 7α-methylestratrienone 19a which is an intermediate for the synthesis of a highly potent estrogen.
    Notes: 6-Cyanöstratrien 15 wird durch Luftoxidation im Zweiphasensystem in das 6-Oxoöstratrien 13 übergeführt. Dieses wird stereoselektiv zum 7α-Methylöstratrienon 19a alkyliert, das ein Zwischenprodukt zur Synthese eines starken Östrogens darstellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820308
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  • 10
    Electronic Resource
    Electronic Resource
    7-Aroyl-1H, 7H-s-triazolo[1,2-a]-s-triazol-1,3(2H)-dione, eine neue Klasse von Verbindungen aus 5-Phenyloxazolen und 4-Phenyl-4H-1,2,4-triazol-3,5-dion (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 641-648 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 7-Aroyl-1H,7H-s-triazolo (1,3(2H)-diones, a New Class of Compounds from 5-Phenyloxazoles and 4-Phenyl-4H-1,2,4-triazole-3,5-dioneThe 5-aryloxazoles 2a-e and their substituted derivatives 8a-c and 10 react with 4-phenyl-4H-1,2,4-triazole-3,5-dione (3) to give the new 7-aroyl-1H,7H-s-triazolo[1,2-a]- s-triazole-1,3(2H)-diones 5a-e, 9a-c, and 11. The structure is deduced from the 13C NMR spectroscopic data of 5b, 9a, and 11. The mechanism is shortly discussed.
    Notes: Durch Umsetzung der 5-Aryloxazole 2a-e sowie der substituierten Vertreter 8a-c und 10 mit 4-Phenyl-4H-1,2,4-triazol-3,5-dion (3) lassen sich die neuen 7-Aroyl-1H,7Hs-triazolo[1,2-a]-s- triazol-1,3(2H)-dione 5a-e, 9a-c und 11 herstellen. Die Struktur wird aus den 13C-NMR-spektroskopischen Daten von 5b, 9a und 11 abgeleitet. Der Mechanismus der Bildung wird kurz diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840404
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