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  • 1
    Unknown
    World Catalogue and Bibliography of the recent Mysidacea (1993)
    Wetzlar : Müller, Wiss. Verl
    Details Availability
    Call number: lmthAWIPots--- 3-930311-03-8 lw 1993
    Pages: 2 Disketten
    ISBN: 3930311038
    Series Statement: Mysidacea-catalogue A
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen über spezifische Organe niederer Sinne bei rhabdocoelen Turbellarien (1936)
    Springer
    Journal of comparative physiology 23 (1936), S. 253-292 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344199
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  • 3
    Electronic Resource
    Electronic Resource
    Locally adaptive hazard smoothing (1990)
    Springer
    Probability theory and related fields 85 (1990), S. 523-538 
    Details
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We consider nonparametric estimation of hazard functions and their derivatives under random censorship, based on kernel smoothing of the Nelson (1972) estimator. One critically important ingredient for smoothing methods is the choice of an appropriate bandwidth. Since local variance of these estimates depends on the point where the hazard function is estimated and the bandwidth determines the trade-off between local variance and local bias, data-based local bandwidth choice is proposed. A general principle for obtaining asymptotically efficient data-based local bandwiths, is obtained by means of weak convergence of a local bandwidth process to a Gaussian limit process. Several specific asymptotically efficient bandwidth estimators are discussed. We propose in particular an, asymptotically efficient method derived from direct pilot estimators of the hazard function and of the local mean squared error. This bandwidth choice method has practical advantages and is also of interest in the uncensored case as well as for density estimation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203169
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  • 4
    Electronic Resource
    Electronic Resource
    The induction of cytochrome P-450 in the alkane-utilizing yeast Lodderomyces elongisporus: Alterations in the microsomal membrane fraction (1984)
    Springer
    Applied microbiology and biotechnology 19 (1984), S. 29-35 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The adaptation of Lodderomyces elongisporus cells to n-alkane utilization was found to be connected with several alterations in the enzyme pattern of the whole cell and the microsomal fraction in particular. A strong induction was found for the microsomal localized cytochrome P-450 alkane hydroxylase system and other enzymes which are directly involved in the terminal degradation pathway of n-alkanes (long-chain alcohol and aldehyde dehydrogenases, catalase). The decrease of the pO2 in the medium enhances the concentration of the constituents of the alkane hydroxylase system as well as that of several other haemoproteins (catalase, cytochrome oxidase), while the long-chain alcohol and aldehyde dehydrogenase enzymes are probably unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252813
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  • 5
    Electronic Resource
    Electronic Resource
    Substrate specificity and stereoselectivity of fatty alcohol oxidase from the yeast Candida maltosa (1992)
    Springer
    Applied microbiology and biotechnology 37 (1992), S. 66-73 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary In Candida maltosa and other alkene-utilizing yeasts a membrane-bound fatty alcohol oxidase (FAOD) is induced by growth on n-alkenes. The oxidation of 1-alkanols to the corresponding aldehydes is accompanied by the stoichiometric consumption of 1 mol O2 and formation of 1 mol hydrogen peroxide (H2O2). The FAOD of C. maltosa shows a broad substrate specificity. It catalyses the oxidation of 1-alkanols (C4 to C22), with a maximal activity of 1.85 gmmol H2O2/ min × mg protein for 1-octanol, as well as the transformation of 2-alkanols (C8 to C16) to ketones. Other compounds as α,ω-alkenediols, ω-hydroxypalmitic acid, phenylalkanols and terpene alcohols are substrates for the enzyme, although mostly with decreased activities. The oxidation of the racemic 2-alkanols by the FAOD proceeds with very high stereoselectivity for the R(−)-enatiomers only, leaving the S(+)-2-alkanol untouched.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174205
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  • 6
    Electronic Resource
    Electronic Resource
    Die wirkungsweise der viskositätsindex-verbesserer (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 67 (1978), S. 61-78 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: One of the major reasons for using polymeric additives is to obtain a product which has better viscosity-temperature characteristics than a comparable pure mineral oil. Extensive measurements of the viscosity-temperature behaviour of motor oils with and without polymer addition show the necessity of a revision of the generally accepted concept of the mechanism of viscosity index improvement. By addition of polymer the better viscosity-temperature characteristics of light oils, which are however of very limited value for lubrication of engines because of their low viscosity at high temperatures, can be maintained partially in the range of higher viscosities. So it becomes obvious how it is possible to produce multigrade oils both from polymers the polymer coil dimensions of which expand, as well as from polymers, the polymer coils of which contract with increasing temperature. In fact, coil expansion promotes viscosity index improvement to some extent but in no way does this effect play a decisive part.
    Notes: Durch Polymerzusatz hergestellte Motoröle besitzen gegenüber den mit ihnen konkurrierenden Einbereichsölenmit gleicher Viskosität bei derselben höheren Temperatur ein wesentlich verbessertes Viskositäts-Temperatur-Verhalten. Zur Frage der Wirkungsweise dieser Viskositätsindex-Verbesserer wurden ausführliche Messungen durchgeführt. Es zeigt sich, daß es durch Einsatz dieser Polymeren möglich ist, die von Natur aus günstigere Viskositäts-Temperatur-Charakteristik niederviskoser Grundöle, deren andere Viskositätslage von vornherein den praktischen Einsatz weitgehend ausschließt, tendenziell in das Gebiet höherer Viskosität „hinüberzuretten“. Die bisher wenigstens teilweise als entscheidend angesehene Frage der Polymerknäelexpansion erweist sich als Effekt zweiter Ordnung, der die Verbesserung des Viskositätsindex zusätzlich begünstigt, jedoch lassen sich Viskositätsindices ähnlicher Größenordnung auch durch Zusatz solcher Polymerer erreichen, bei denen mit steigender Temperatur keine Knäuelexpansion, sondern eine Knäelkontraktion zu beobachten ist.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1978.050670105
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  • 7
    Electronic Resource
    Electronic Resource
    Zum abbau von polymerlösungen durch kapillarscherung. Einfluß der kapillarlänge und strömungsform auf den abbau (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 57 (1977), S. 99-109 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The dependence of shear degradation of polymer solutions on capillary length at constant shear stress is investigated with solutions of poly(isobutylene) (Mvis=6,1 · 106) in toluene. We examined concentrations of 0.1, 0.25, 1 and 4% and found the degradation to increase with capillary length. In 0,1% solution we found a decreased efficiency of degradation, due to a change in the structure of solution.Flow instabilities, which appear above a critical shear rate D in polymer solutions and pretend a loss in viscosity, are not caused by shear degradation. This result supports our interpretation of unstable flow of polymer solutions as slip flow (spurt).
    Notes: Der Einfluß der Kapillarlänge auf den Abbau von Polymerlösungen bei konstanter Schubspannung wird an Lösungen von Polyisobutylen (Mvis=6,1 · 106) in Toluol untersucht. Bei allen untersuchten Konzentrationen (0,1, 0,25, 1 und 4%) nimmt der Abbau mit steigender Kapillarlänge zu. Bei der 0,1proz. Lösung findet sich eine verringerte Effektivität des Abbaus, was auf eine Äderung der Lösungsstruktur zurückzuführen ist. Das oberhalb einer kritischen Scherrate D bei Polymerlösungen zu beobachtende instabile Fließen (scheinbare Viskositätsabnahme) ist nicht ursächlich auf Scherabbau zurückzuführen. Dieses Ergebnis ist eine indirekte Stütze für die Deutung dieser Fließerscheinung als Gleitfließen (spurt).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050570108
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanical shear degradation of a polymer solution by capillary flow (1980)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 1 (1980), S. 27-29 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1980.030010106
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  • 9
    Electronic Resource
    Electronic Resource
    Röntgenkleinwinkelanalyse von polymeren Latices mit Kern-Schale-MorphologieProfessor Karl Heinz Büchel zum 60. Geburtstag gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 103 (1991), S. 1715-1717 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19911031238
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  • 10
    Electronic Resource
    Electronic Resource
    Mechanischer Scherabbau von Polymeren in Lösung mittels turbulenter Strömung, 2Teil 1: cf.12.. Die Abhängigkeit der Abbaugeschwindigkeit von der Polymergesamtkonzentration in guten Lösungsmitteln (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 529-547 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Mechanical shear degradation of poly(decyl methacrylate), (viscosity average molecular weight in tetrahydrofuran M̄η = 1,3·106, M̄w/M̄n = 5) in the thermodynamically good solvent tetrahydrofuran has been studied in turbulent flow through a capillary as a function of polymer concentration in the range from 0,22 to 8,9 g/100 cm3. Due to turbulent flow conditions the shear stress, shear rate and shear energy proved to be the same for all concentrations and remained constant during degradation, giving a general insight into mechanism of degradation. The rate of degradation has been followed using molecular weight distribution curves obtained by gel permeation chromatography. The reaction was found to be of first order. Rate constants determined for molecular weights from 3,2-9,5·106 decreased with increasing concentration following a law of the type ki = (K + b·c)-1, K and b being constants for each molecular weight. Hydrodynamic volumes of polymer molecules have been calculated according to models of Rudin as function of molecular weight and concentration. It can be shown that rate constants of degradation and calculated hydrodynamic volumes are proportional for the whole range of molecular weight and concentrations up to 3,6 g/100 cm3. There is also a rather good proportionality between these rate constants and the volumes of polymer coils predicted by de Gennes. This result is an additional confirmation of the concept that hydrodynamic volume governs shear degradation of polymer solutions. Additional experiments show that this type of concentration dependence is also to be found for other polymers in other solvents.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820220
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