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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 56 (1962), S. 257-265 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dielectric dispersion of bovine hemoglobin, ovoalbumin, and bovine ferrimyoglobin was investigated in a glycerin-water mixture. It was found that the dispersions, of these protein solutions were largely modified by the increase of the viscosity of the solvent and a linear relationship was obtained between the relaxation times and the viscosity of the solvent postulated by the Stokes law. On the contrary, the dispersion of catalase solution was not affected by the addition of the glycerin, which indicated that the dielectric polarization of this protein was due to the different polarization mechanism and the polarization by surface ion conduction was suggested.
    Additional Material: 5 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1197-1205 
    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: Poly(itaconsäure) (3) wurde durch Polymerisation von Itaconsäureanhydrid in Xylol bei 60°C mit 2,2′-Azodiisobutyronitril (AIBN) und die Hydrolyse des gebildeten Poly(itaconsäureanhydrid)s mit Wasser hergestellt. 3 wurde mit Hilfe der Elementaranalyse. der IR und 1H-NMR Spektren sowie seiner Umsetzung zu Poly(dimethylitaconat) identifiziert.
    Notes: Poly(itaconic acid) (3) was prepared by polymerizing itaconic anhydride in xylene at 60°C with 2,2'-azodiisobutyronitrile (AIBN) and hydrolyzing the resulted poly(itaconic anhydride) with water. 3 was identified by the elemental analysis. IR and 1H-NMR spectra, and converting it to poly(dimethyl itaconate).
    Additional Material: 7 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1169-1174 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The thermal properties of complexes between poly(2-carboxyethylmethylsiloxane) and poly-(dimethylsiloxane) are investigated. The results of DSC measurements indicate that the first-order transition of the complexes is affected by the amount of poly(dimethylsiloxane) in the complex. From dynamic viscoelasticity measurements, it is inferred that the complex exhibits entropy elasticity due to a network structure maintained by hydrogen bonds.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1375-1381 
    ISSN: 0887-624X
    Keywords: 1,3,4-thiadiazole ; polyazomethine ; conjugated polymer ; thermally stable polymer ; semiconductive polymer ; polycondensation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel 1,3,4-thiadiazole-containing polyazomethines and copolyazomethines were synthesized by the solution polycondensation, in m-cresol at 25°C, of aromatic dialdehydes, isophthalaldehyde and terephthalaldehyde, with 2,5-bis (m-aminophenyl)-1,3,4-thiadiazole (BMAT) and with BMAT and aromatic diamines, bis (4-aminophenyl) ether and 1,5-diaminonaphthalene, respectively. These polymers were tan yellow to yellow in color and had reduced viscosities up to 0.32 dL/g in concentrated sulfuric acid and electric conductivity as high as 10-9-10-11 S cm-1 at 25°C. All the polymers were insoluble in common organic solvents but dissolved completely in concentrated sulfuric acid and formic acid. However, they were readily hydrolyzed in concentrated sulfuric acid. X-ray diffraction diagrams showed that the crystallinity of polyazomethines were low, but copolyazomethines were highly crystalline. These azomethine polymers are highly thermally and thermooxidativelly stable and exhibited no appreciable decomposition up to 400°C in both air and nitrogen atmospheres. Doping with iodine dramatically raised the conductivity and produced the dark brown- to completely black-colored semiconductive polymers with a maximum conductivity of the order of 10-5 S cm-1. Electronic spectra of the undoped polymers indicated a large bathochromic shift of the π-π* absorption band (310 nm) due to C=N bonds of BMAT. This result suggests that π-electrons of the polymers are extensively delocalized along the main chain.
    Additional Material: 3 Ill.
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  • 5
    ISSN: 1045-4861
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Anodic polarization measurements of several orthopaedic implant alloys - AISI 316L stainless steel, Co—Cr—Mo alloy (ASTM F-75), nickel-titanium (NiTi) alloy, commercial pure titanium, and Ti—6Al—4V - were carried out in Ringer's solution containing 1% bovine serum albumin (BSA) and in simple Ringer's solution. Constituent metals in the medium were analyzed by inductively coupled plasma emission spectrophotometry after measurements. Pitting potentials and total anodic current of former two alloys were constant in the two mediums and not affected by the addition of bovine serum albumin. However, the amount of dissolved metals from pure nickel and AISI 316L stainless steel were increased by the addition of BSA; dissolved metals from Co—Cr—Mo alloy were decreased by it.
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 33 (1993), S. 59-68 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dipole moments of small protein molecules were determined experimentally in order to validate the calculated dipole moments by previous investigators. We found that the agreements are satisfactory for some proteins. There are, however, many proteins for which the agreement is less than satisfactory. In order to find the cause of the disagreement, the dipole moments of these proteins were recalculated using the Brookhaven Protein Data Bank. We calculated the dipole moment due to fixed surface charges and the bond moments of all the carbonyl groups in main chain and side chains. The calculation consists of the mean moments and their mean square fluctuations. In addition, we investigated the effect of electrostatic interactions between charged sites for several proteins. These results show that incorporation of the interactions does not affect substantially the calculated dipole moments. The rms fluctuation of the dipole moment is found to be small but not negligible. In conclusion, recalculated dipole moments are in good agreement with the observed values. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
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  • 7
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neurotoxic peptides from venoms of scorpions and honey bees exhibit a consensus pattern in the two disulfide bridgings related to the sequence portions Cys-X-Cys and Cys-X-X-X-Cys. A revised three-dimensional structure of charybdotoxin, as determined by two-dimensional nmr spectroscopy, confirms that the consensus cystine dislocation generates in all these toxins a common structural element, i.e., the cystine-stabilized α-helical (CSH) motif, which may be correlated with their common ion channel blocking activity.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 8 (1969), S. 199-216 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The π-electron polarizability of conjugated base molecules such as uracil and adenine are calculated semiempirically by using molecular orbital theories. The Hüekel method and the self-consistent-field (SCF) theory are used in the present calculation. The theoretical values obtained by the Hüekel method are consistently larger than the experimental results. The values obtained by the SCF theory are in good agreement with observed values. It is clearly demonstrated that the SCF method is better than the Hükel method for the calculation of polarizability. The polarizability of the adenine-uracil pair is calculated as the sum of the polarizabilities of adenine and uracil and also calculated by solving the eigenvalue problem for the A-U pair as an entity. The second method gives considerably larger polarizability than the first method. Discussions are presented and it is demonstrated that the second method is the correct way to calculate the polarizability of the A-U pair.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 1437-1452 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Birefringence of poly-A, poly-U, and double-stranded poly-AU are investigated experimentally as well as theoretically. Single-stranded poly-A, at low ionic strength, exhibits a strong negative birefringence indicating that, adenine molecules are stacked regularly with their planes along the transverse direction. On the addition of Mg or Mn ions, the birefringence decreases markedly. Poly-U has no noticeable birefringence indicating that poly-U has a contracted configuration in solution. On mixing poly-A and poly-U with 10-3M MgCl2, the birefringence increases markedly, but the change in the chain configuration seems less pronounced. The polarizability of adenine and uracyl are ejaculated using the simple Ifïückel scheme. The calculation shows that the π-electron polarizability normal to the base plane is zero. Therefore, the negative birefringence is probably due to the lack of π-electron polarizability in the direction normal to the base plane and accordingly no π-electron polarizability along the major helix axis. Conversely, the negative birefringence is an indiaction of base stacking.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 2 (1964), S. 287-289 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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