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  • 1
    Electronic Resource
    Electronic Resource
    Data analysis with minimal assumptions (1992)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 6 (1992), S. 247-255 
    Details
    ISSN: 0886-9383
    Keywords: Analysis of variance ; Assumptions ; Graphics ; Models ; Validation of model ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The computer has made it possible to scrutinize data rapidly by means of graphics. This should be done prior to the application of any model to the data, since the model must be validated before using it as a means of analyzing the data. The procedure is illustrated in terms of two examples of real experimental data.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180060504
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  • 2
    Electronic Resource
    Electronic Resource
    Reply to comments: ‘Data analysis with minimal assumptions’ (1994)
    New York, NY : Wiley-Blackwell
    Journal of Chemometrics 8 (1994), S. 301-302 
    Details
    ISSN: 0886-9383
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cem.1180080412
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  • 3
    Electronic Resource
    Electronic Resource
    The physical chemistry of polyelectrolyte solutionsPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “Polymers and Water” in Bad Nauheim (W-Germany) on April 2/3 1984. (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 123 (1984), S. 63-83 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Some physical properties of aqueous solutions containing linear, flexible, polyelectrolytes are reviewed in order to emphasize the role of charge interactions in these systems which strongly depend on the charge of the macromolecular chain and the concentration of low molar mass electrolyte in solution. Particular emphasis is put on polyelectrolyte solutions containing an excess of added salt, which from a theoretical point of view are easier to understand. Both the dilute and the semi-dilute case will be discussed. In the former the problem of the electrostatic potential around the macromolecular chain is briefly reviewed as well as the use of a wormlike chain model to derive average dimensions of polyelectrolytes in solutions. In the latter the scaling approach to concentration effects in polyelectrolyte solutions is briefly discussed. The pecularities of the semi-dilute regime in polyelectrolyte solutions is illustrated with the help of results obtained with dynamic light scattering and the time dependent decay of electric birefringence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051230103
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  • 4
    Electronic Resource
    Electronic Resource
    Das Mischzeitverhalten bei sehr geringen Konzentrationen (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 68-70 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330650111
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Reaktion der Lanthanoiden mit Chelatliganden Darstellung und Struktur von [(py2CH)3Gd] (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 941-944 
    Details
    ISSN: 0044-2313
    Keywords: GdIII trigonal prismatic complexes ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Reaction of the Lanthanides with Chelate Ligands Synthesis and Crystal Structure of [(py2CH)3Gd]GdBr3 reacts with [(py2CH)Li] to the mononuclear complex [(py2CH)3Gd] 1.The structure of 1 was characterized by X-ray single crystal structure analysis. Space group P21, Z = 2, a = 951.4(10) pm, b = 1369.4(10) pm, c = 1074.5(10) pm, β = 105.69(8)°.The Gd-Ion is surrounded by the six nitrogen atoms of the three chelate ligands and shows a distorted trigonal prismatic coordination. As a difference to the lithium salt of the ligand, the six-membered metalla-cycles in 1 are not planar, but show a boat conformation.
    Notes: GdBr3 reagiert mit [(py2CH)Li] zu dem einkernigen Komplex [(py2CH)3Gd] 1.Der Aufbau von 1 wurde durch eine Kristallstrukturanalyse geklärt: Raumgruppe P21, Z = 2, a = 951,4(10) pm, b = 1369,4(10) pm, c = 1074,5(10) pm, β = 105,69(8)°.Das Gd-Ion ist von den sechs Stickstoff-Atomen der drei Chelatliganden koordiniert und besitzt eine verzerrt trigonalprismatische Umgebung. Die in 1 gebildeten Metalla-Sechsringe sind im Gegensatz zum Lithiumsalz des Liganden nicht planar, sondern zeigen Wannenkonformation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210606
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  • 6
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur von [Cp2MoHLi(thf)]3 · Toluol (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 945-947 
    Details
    ISSN: 0044-2313
    Keywords: Molybdenum(II) ; Mo—Li heterobimetallic complex ; synthesis ; X-ray structure analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of [Cp2MoHLi(thf)]3 · Toluene[Cp2MoHLi]4 reacts in THF/Toluene to the trimeric complex [Cp2MoHLi(thf)]3 · Toluene 1.The structure of 1 was characterized by X-ray single crystal structure analysis. Space group P63, Z = 2, a = 1459.5(9) pm, c = 1182.3(8) pm. The central unit is represented by a Mo3Li3-hexagon. Each Mo-Atom is surrounded by two Cp-Ligands. One THF-Molecule is coordinated to each Li-atom. The Hydrogen-Ligand could not be located by the single crystal structure analysis.
    Notes: [Cp2MoHLi]4 reagiert in THF/Toluol zu der trimeren Verbindung [Cp2MoHLi(thf)]3 · Toluol 1.Der Aufbau von 1 wurde durch eine Kristallstrukturanalyse geklärt: Raumgruppe P63, Z = 2, a = 1459,5(9) pm, c = 1182,3(8) pm. Die zentrale Einheit in 1 bildet ein Mo3Li3-Sechsring. An jedes Mo-Atom koordinieren zwei Cp-Liganden. Jeweils ein THF-Molekül koordiniert an ein Li-Atom.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210607
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  • 7
    Electronic Resource
    Electronic Resource
    The conformational transition in partially esterified poly-(methacrylic acid) (1964)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 80 (1964), S. 141-148 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Konformationsumwandlung von teilweise veresterter Polymethacrylsüre wurde mit Hilfe der potentiometrischen Titration untersucht.Es wurde gefunden, daß die Stabilität der bei kleinem Dissoziationsgrad (α) vorliegenden Form nicht vermindert wird, wenn die Zahl jener Kettenglieder, die intramolekulare Wasserstoffbrücken ausbilden können, abnimmt. Es zeigt sich vielmehr, daß die Umwandlung mit der mittleren Ladung pro Struktureinheit zusammenhängt. Dies stützt die Hypothese, wonach die bei kleinen α-Werten stabile Form eine kompaktere Struktur besitzt, die möglicherweise durch VAN DER WAALsche Wechselwirkungen zwischen den  - CH3-Gruppen stabilisiert ist.
    Notes: The conformational transition of poly-(methacrylic acid), partially esterified with dimethyl sulfate, has been studied using potentiometric titration at constant temperature.It is found that the stability of the form existing at low values of dissociation (α) is not decreased by reducing the number of groups on the chain capable of establishing intramolecular hydrogen bonds. The transition is also shown to depend on the average charge per monomeric unit. This confirms the hypothesis that the stable form at low α-values is a compact structure stabilized probably by VAN DER WAALS attractions between  - CH3 groups.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1964.020800112
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  • 8
    Electronic Resource
    Electronic Resource
    Differentiation between the α-helical and coillike conformations of poly(L-glutamic acid) in aqueous solution through binding of pinacyanol (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 2267-2277 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pinacyanol in the presence of an excess of poly(L-glutamic acid) [polymer/dye ratio (P/D) 〉 10] exhibits different absorption spectra in the visible region when bound to the slightly charged polypeptide in the α-helical conformation or to the nearly completely dissociated polypeptide in the coillike conformation. These spectra reveal aggregation of the dye bound to the macromolecular chain in both conformations, although in the coillike one different kinds of aggregates may be present. Dye binding is accompanied by the appearance of CD bands in the visible region which are also different for the α-helical and the coillike conformations. The aggregates formed in the presence of the latter change slowly in time and seem to induce some conformational changes in the polypeptide chain. Furthermore, they have been found to be, at least partially, stable with respect to a subsequent reversal to the α-helical conformation. All results could be qualitatively interpreted assuming that in the coillike conformation, ordered regions exist along the chain as proposed by Krimm and Tiffany.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360180914
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  • 9
    Electronic Resource
    Electronic Resource
    Physicochemical properties of aqueous xanthan solutions: Static light scattering (1994)
    New York : Wiley-Blackwell
    Biopolymers 34 (1994), S. 783-797 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The secondary structure of xanthan in solutions of relatively low salt concentration and at room temperature has been investigated using static light scattering experiments. Additional evidence has been found for a dimeric structure at 25°C in 0.01M NaCl. From the experimental z-average mean square (ms) radius of gyration, a value for the persistence length p has been estimated, taking explicitly into account the polydispersity of the three samples used, which has been established by gel permeation chromatography (GPC) measurements. The experimental particle scattering functions of the three samples are consistent with theoretical estimates for polydisperse systems with the same value of p = 65 ± 10 nm and the molar mass per unit length for a dimeric structure.This secondary structure remains unaffected by the ionic strength in the 0.005-0.0lM range. Partial aggregation seems to occur at higher NaCl concentrations.Light scattering and GPC data show that heating the xanthan 0.01M NaCl solutions to about 70°C considerably reduces the Mw of the low molar mass sample (2.3 × 105-g·mol-1), contrary to what is observed for the high molar mass sample (1.8 × 106-g·mol-1). These experimental findings can be accounted for by a partial temperature-induced dissociation of the xanthan dimers according to an all-or-none mechanism. © 1994 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360340610
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  • 10
    Electronic Resource
    Electronic Resource
    A hydrodynamic study with quasielastic light scattering and sedimentation of bacterial elongation factor EF-Tu · guanosine-5′-diphosphate complex under nonassociating conditions (1990)
    New York : Wiley-Blackwell
    Biopolymers 30 (1990), S. 299-308 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The hydrodynamics of the bacterial elongation factor EF-Tu have been studied in the presence of its ligand guanosine-5′-diphosphate (GDP) by sedimentation in the ultracentrifuge and quasielastic light scattering. Sedimentation studies have made it possible to establish experimental conditions under which only negligible aggregation of the protein occurs (neutral pH, concentration 〈 3 mg/mL). Analysis of the light intensity autocorrelation functions under these conditions revealed two independent scattering species with diffusion coefficients of 0.71 × 10-6 and 0.04 × 10-6 cm2 s-1. The material with the lower diffusion coefficient, i.e., the aggregates, represented less than 1% of the total number of EF-Tu particles. The other 99% diffused as monomeric molecules with a molar mass corresponding to the value calculated from the known primary structure of the protein. The hydrodynamic parameters derived from the experimental data suggest that EF-Tu·GDP in solution is close to a spherical particle.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360300308
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