ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    The role of surface thermodynamics in thromboresistance of biomaterials (1975)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 9 (1975), S. 127-142 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A thermodynamic approach to the problem of platelet adsorption out of a suspension on to a smooth and homogeneous solid surface is developed. The interfacial tension values required may be estimated from contact angle data by means of an equation of state relation. According to the thermodynamic approach the functional dependence of platelet adsorption on surface tension of the solid differs according to whether the surface tension of the platelets is smaller or larger than the surface tension of the liquid in which they are suspended. The implications of this thermodynamic approach in situations where plasma proteins are present and the biomaterials surfaces may be heterogeneous and rough are discussed. Previous analyses using the critical surface tension of wetting and other surface-related parameters are compared with the thermodynamic analysis given here.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820090203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Rearrangements and fragmentations of [C2H5S]+ ionsPart II: for Part I, see Ref. 1. (1979)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1979), S. 543-549 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From deuterium labelling experiments it was concluded that metastable molecular ions of ethyl methyl sulfide lose a methyl radical with the formation of both [CH3S=CH2]+ amd [CH3CH=SH]+· The fragmentation reactions of metastable ions generated with these structure are losses of C2H2, H2S and CH4. These reactoins and the preceding isomerizations have also been studied by means of deuterium labelling. From the results it is concluded that the three fragmentation reactions most probably occur from ions with a C—C—S skeleton. Appearance energy measurements for ions generated with the two structures above and all give rise to the same ΔHf value for these three isomeric forms. Ab initio molecular orbitals calculations confirm that these three ions fortuitously have very similar heats of formation. A potential energy diagram rationalizing the isomerizations and the principal fragmentation reaction is presented.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210141006
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Mass spectrometry of N-nitrosaminesResearch sponsored by the Energy Research and Development Administration under contract with the Union Carbide Corporation. (1978)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1978), S. 395-408 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of a series of N-nitrosamines for carcinogenicity studies presented an opportunity to study mass spectral fragmentation schemes in detail. Condensed spectra are listed for 146 N-nitrosamines of widely differing structures, including nitroso derivatives of commercial drugs and insecticides. Aliphatic nitrosamines were generally characterized by molecular ions and loss of OH. Subsequent fragmentation via α-cleavage is similar to that of aliphatic amines. The loss of OH is believed to result in a cyclic ion. Substituted aliphatic nitrosamines varied in fragmentation schemes with structure and position of the substituent groups. However, most showed α-cleavage at some point in fragmentation. When substituted with aromatic groups, prominent peaks due to the aromatic moiety were observed. The alicyclic nitrosamines showed losses of NO, NOH and OH and subsequent α-cleavages. Nitrosamides were characterized by rupture of the carbonyl to nitrogen bond. Spectra of substituted ureas usually showed charge retention by the carbonyl fragment, while carbamate esters showed ions from both fragments.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200050606
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Chemische Reaktionen in Salzschmelzen. XVIII. Die Synthese des Methylzinntrichlorids, CH3SnCl3 (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 21-29 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Reactions in Molten Salts. XVIII. Synthesis of Methyltin Trichloride, Ch3SnCl3A process for the synthesis of CH3SnCl3 by reaction of molten SnCl2 and CH2Cl infused salts is described. Out of the systems investigated with NaCl, KCl, AlCl3, ZnCl2, KZnCl3, LiAlCl4, NaAlCl4, KAlCl4, and CuAlCl4, the systems with NaAlCl4 and NaAlCl4/KAlCl4 proved best. We measured the space-time-yield (RZA) as a function of the salts admixed to SnCl2 as well as a function of the reaction temperatur, gasification, and inlet rate of CH3Cl respectively. The optimum reaction conditions are investigated and the system SnCl2//NaAlCl4 is described.
    Notes: Ein Verfahren zur Synthese von CH3SnCl3 durch Reaktion von geschmolzenem SnCl2 mit CH3Cl in Salzschmelzen wird beschrieben. Von den untersuchten Systemen mit NaCl, KCl, AlCl3, ZnCl2, KZnCl3, LiAlCl4, NaAlCl4, KAlCl4 und CuAlCl4 erwiesen sich als besonders vorteilhaft NaAlCl4 und NaAlCl4/KAlCl4. Gemessen wurde die Abhängigkeit der Raum-Zeit-Ausbeute (RZA) vom Zusatz von Fremdsalz zum SnCl2 sowie von der Reaktions-Temperatur, der Begasung und der Einleitgeschwindigkeit von CH3Cl, und die optimalen Versuchsbedingungen bestimmt. Das System SnCl2/NaAlCl4 wird beschrieben.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784440102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Substitutionsreaktionen mit SchwefeldiimidenProfessor Fritz Seel zum 60. Geburtstage am 21. September 1975 gewidmet (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 416 (1975), S. 306-310 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution Reactions with Sulphur DiimidesSubstituted sulphur diimides are obtained by the reactions of (CH3)3Si—N=S=N—Si(CH3)3 with CH3SO2Cl and CCl3SCl or with P2O3F4 and (CH3)3Si—N=S=N—SN(CH3)2. S4N4 reacts with (CH3)2Si[N(CH3)2]2 to from (CH3)2Si(N(CH3)2)—N=S=N—SN(CH3)2 while S3N2Cl2 yields (CH3)2Si(Cl)—N=S=N—SN(CH3)2.It is possible to substitute the chlorine atom by diethylamine in the last compound.The new compounds are intermediates for the syntheses of cyclic sulphur-nitrogen compounds. They were characterized by mass-, ir-, 1H-nmr spectra and elemental analysis.
    Notes: Substituierte Schwefeldiimide werden durch Umsetzung von (CH3)3Si—N=S=N—Si(CH3)2 mit CH3SO2Cl und CCl3SCl oder von P2O3F4 mit (CH3)3Si—N=S=N—SN(CH3)2 dargestellt. S4N4 bzw. S3N2Cl2 reagieren mit (CH3)2Si[N(CH3)2]2 zu (CH3)2Si(N(CH3) 2)—N=S=N—SN(CH3)2 und (CH3)2Si(Cl)—N=S=N—SN(CH3)2.In der letzten Verbindung kann man das Chloratom durch Diäthylamin substituieren. Die neuen Verbindungen stellen Zwischenprodukte für die Synthese cyclischer Schwefel-Stickstoff- Verbindungen dar. Sie wurden durch Massen-, IR-, 1H-NMR-Spektren und Elementaranalysen charakterisiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754160315
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Levans. V. Kinetics of the acid hydrolysis of Streptococcus salivarius levan (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2373-2385 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the acid hydrolysis of Streptococcus salivarius levan were studied by examining the weight-average molecular weight. The molecular weights were obtained in a continuous manner from light scattering. Two first order reactions were observed: an initial rapid reaction in competition with a slower reaction.Activation energies, activation entropies, as well as the rate dependence upon substrate and hydrogen ion concentrations were determined. The data seem to indicate that the fast reaction is related to the breaking of branch-point bonds while the slower reaction is related to the breaking of main-chain bonds. Thus, levan hydrolysis seems to be fundamentally different from the completely random degradation of other branched polysaccharides, i.e., dextran, glycogen, and amylopectin.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360141111
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Conformational changes induced in ionized poly(L-arginine) and poly(L-histidine) by sodium dodecyl sulfate (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 1319-1329 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Circular dichroism spectra have been obtained for cationic poly(L-arginine) and poly(L-histidine) in aqueous solutions containing varying amounts of sodium dodecyl sulfate. The detergent induces a disorder-order transition in both polypeptides. In each case the transition is cooperative and occurs when the ratio of detergent to amino acid residue is near unity. The ordered structure formed by poly(L-arginine) is readily identifiable as an α helix. Poly(L-histidine) appears to form a β structure in which the 211-nm electronic absorption band of the imidazole group exhibits significant rotatory strength.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160612
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Levans. II. Light-scattering and sedimentation data of Streptococcus salivarius levan in water (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1283-1292 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular weights and radii of gyration of Streptococcus salivarius levan fractions were obtained from light-scattering measurements in water. Sedimentation coefficients and partial specific volumes of the fractions were also obtained. Double logarithmic plots of [η] versus M̄w and S0 versus M̄w yielded slopes having values of 0.17 and 0.62, respectively. The data and various calculated parameters show that levan from Streptococcus salivarius is highly branched and behaves hydrodynamically as a compact particle of spherical symmetry.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140616
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Cationic polymerization of p-substituted α-methylstyrenes, 1. Tacticity by 1H- and 19F-NMR spectroscopy (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 781-787 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760320
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Mechanical and dielectric investigations of relaxations in polymers (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 3 (1979), S. 247-275 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dynamics of polymer melts is well reflected in the complex shear compliance J*(ω,T,M) measured in wide ranges of frequency and temperature and for various molecular weights. In the frame of the meander model all typical features of J*(ω,T,M) are quantitatively described: (1) JeNo is due to intra-meander shear, and decreases by incorporating pairs of chain ends within the superstructure folds, i.e. with decreasing M. (2) This shear motion is guaranteed by a certain amount of edge-dislocations (with Burgers vector b equal to the chain distance d- for some polymers equal to d/2). The glass relaxation and its activation diagram are understood by asking for the probability for just this amount of dislocation segments to be present. The dielectric relaxation strengths and those of the thermal properties support the chosen segment lengths. (3) The step height to the steady state compliance, Jeo - JeNo (proportional to JeNo above MC, but strongly dependent on M-distribution), is due to inter-meaner shear (formation of shear bands). (4) These bands relax by disentanglement via chain reptation across half the length of a molecule within the flow relaxation time τF. (5) The Viscosity follows from η = τF/Δeo, and is proportional to M3.3 above and M1.3 below Mc. (6) The critical molecular weight Mc is predicated by the model in fair agreement with experimental data.(7) Neglecting flow, the stress-strain curves of uncrosslinked high molecular weight polymer metals can be derived by taking into account intra-and inter-meander shear deformation.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.020031979114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...