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  • Chemistry  (290)
  • 1980-1984
  • 1970-1974  (290)
  • 1950-1954
  • 1970  (290)
Collection
Keywords
Publisher
Years
  • 1980-1984
  • 1970-1974  (290)
  • 1950-1954
Year
  • 1
    Electronic Resource
    Electronic Resource
    Heparin sorptivity and blood compatibility of carbon surfaces (1970)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 4 (1970), S. 145-187 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The influences of the conditioning treatments, surface topography, and crystal structure of carbonaceous surfaces on their ability to sorb heparin and their in vivo compatibility with blood were investigated. The results of the sorption studies indicated that the adsorption of heparin on the surfaces of turbostratic and graphitic materials is not crystallographically selective and that the amount adsorbed on relatively smooth surfaces is near the amount expected for monolayer formation. Although the adsorption of heparin on relatively smooth carbon surfaces is not influenced by the presence of benzalkonium chloride, the sorption of heparin in porous carbons can be greatly increased by a pretreatment with benzalkonium chloride. This increase was found to be due to the formation and entrapment of the insoluble heparin-benzalkonium complex in the accessible porosity. Since the heparin sorptions in Dag-154 coatings were found to be enhanced by a pretreatment with benzalkonium chloride, it was inferred that these coatings contain accessible porosity and that their initial thromboresistance depends on the formation of the benzalkonium-heparin complex in pores. In vivo tests showed that polished and outgassed, impermeable isotropic carbons deposited at low temperatures were significantly thromboresistant without the exogenous application of heparin. There was no relationship between the amount of heparin sorbed on these materials and their compatibility with blood. Polishing, for example, which reduced heparin sorption, enhanced the thromboresistance of these carbons, and while chemisorption of oxygen markedly reduced their thromboresistance, it did not influence the amount of heparin that could be sorbed. Although the heparin-benzalkonium complex sorbed in a porous carbon conferred excellent thromoboresistance in a 2-hr test, the long-tern (14-day) compatibility was not as good as for carbon surfaces that were deposited at low temperatures and then polished and outgassed prior to implanting. In vivo tests of HTI carbon structures and annealed LTI carbons indicate that the blood compatibility of a turbostratic carbon is not significantly dependent on crystallite size, Le. Limited tests of surfaces that had a preponderance of c-faces oriented parallel to the blood-carbon interface at the surface suggest that orientations of this sort are better than others.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820040202
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  • 2
    Electronic Resource
    Electronic Resource
    Gram-Scale purification of arginine, formylmethionione, glutamic acid and phenylalanine transfer ribonucleic acids from E. coli K-12 MO7Research sponsored by the National Institute of General Medical Sciences, National Institutes of Health under contract with the United States Atomic Energy Commission and Union Carbide Corporation, Nuclear Division. (1970)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 12 (1970), S. 889-912 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Gram-sized quantities of purified arginine, formylmethionine, glutamic acid, and phenylalanine-2 tRNAs have been prepared from pools of E. coli K-12 MO7 mixed tRNAs by reversed-phase chromatography after preliminary fractionation on DEAE-cellulose. Purified formylmethionine tRNA and partially purified arginine tRNA and glutamie acid tRNA were obtained from large-scale RPC-3 runs (4 × 36 in. column). The arginine tRNA was further purified by rechromatography on RPC-4 columns, and the gluatmic acid tRNA by rechromatography on an RPC-3 column. Two phenylalanine tRNAs were resolved on large-scale (2 × 96 in. column) RPC-3 runs; only the second phenylalanine tRNA reached a satisfactory degree of activity. About 0.88 g of arginine tRNA, 70% activity; 3.32 g of formylmethionine tRNA, 97% activity; 0.80 g of glutamic acid tRNA, 83% activity and O.92 g of phenylalanine-2 tRNA, 78% activity, were produced. The processing steps employed are reliable and reproducible and the procedure is amenable to routine production of these tRNAs.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260120604
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  • 3
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the system N2O4⇌2NO2⇌2NO + O2 (1970)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 16 (1970), S. 420-425 
    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: Thermodynamic properties of the chemically reactive system N2O4 ⇌ 2NO2 ⇌ 2NO + O2 have been evaluated over a pressure range of 0.005 to 200.0 atm. and a temperature range of 200° to 900°K. by making use of Lennard-Jones potential. In these calculations, the dissociation of nitrogen tetroxide to nitrogen dioxide, nitric oxide and oxygen, and the effect of pressure on the equilibrium constants for the system of reactions N2O4 ⇌ 2NO2 and 2NO2 ⇌ 2NO + O2 have been taken into account.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690160319
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  • 4
    Electronic Resource
    Electronic Resource
    High-resolution nuclear magnetic resonance spectra of phenanthrenes-IVFor part III, see Ref. 1. Phenyl derivatives of phenanthrene (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 259-270 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton magnetic resonance spectra at 60 MHz are reported for 9, 9′-biphenanthryl, 1-phenylfluoranthene, 9-benzylphenanthrene, 1-, 4- and 9-phenylphenanthrenes and 9-methyl-10-phenylphenanthrene, all in CS2 solution. Approximate values of some of the chemical shifts and coupling constants were extracted from the overlapped and often collapsed AB, ABC ABCD and AA′BB′C (phenyl) spin systems. By comparison with data for phenanthrene itself, estimates have been made for the dihedral angle, θ, between the planes of the phenyl ring and the phenanthrene nucleus in phenylphenanthrenes. These lead, except for 9-phenylphenanthrene for which the angle derived from H(10) by PMR is higher than UV suggests, to plausible values for θ: 90°, 75°, 40° and 45 to 60°, for 4-phenyl, 9-methyl-10-phenyl-, 1- and 9-phenylphenanthrenes, respectively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270020306
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  • 5
    Electronic Resource
    Electronic Resource
    Mass spectrometry - II: The unimolecular decomposition of benzaldehyde azine in the gas phase induced by electron-impact (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 557-569 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of benzaldehyde azine-α, αA-d2 (III) and benzaldehyde azine-d10 (IV) reveal that both ring and α hydrogen are lost from the molecular ion of benzaldehyde azine (II) in forming the [M -1] ion. Data from the spectra of III and IV at 70 eV and reduced ionizing voltages are consistent with the existence of two competing pathways producing [M -1] ions. Rearrangement ions are observed in the spectra of II. Randomization is unimportant in the electron-impact-induced fragmentation reactions of II. The rearrangement-fragmentation reactions for II in general parallel those previously observed for acetophenone azine (I).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030505
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectrometry - III: Further studies of the unimolecular decomposition of acetophenone azine in the gas phase induced by electron-impact (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 571-581 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass spectra of acetophenone azine-d10 (II) and acetophenone azine-d6 (III) were obtained to ascertain the validity of the proposed mass spectral fragmentation mechanisms proposed for acetophenone azine (I). Data from II and III reveal that the [M -1] ion in the spectrum of I is formed via loss of ring hydrogen. Within experimental uncertainty the major fragmentation reactions of the molecular ion of I, the [M -1] ion, and the [M -15] ion occur without loss of structural identity of the phenyl and methyl moieties. Ionization of I occurs with a high degree of structural integrity.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030506
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  • 7
    Electronic Resource
    Electronic Resource
    Mass spectra of esters of α-hydroxy and α-methoxy acids (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1467-1469 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The most abundant fragment produced by electron bombardment of esters of the type R1R2C(OR3)CO2R4 is the R1R2C = \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm O}\limits^{{\rm + } \cdot } $\end{document}R3 ion. Methyl glycollate (R1 = R2 = R3 = H, R4 = Me) eliminates the HCO· radical by a complex rearrangement involving the methylenic hydrogen atoms. The methyl and ethyl esters of methoxyacetic acid (R1 = R2 = H, R3 = Me, R4 = Me or Et) eliminate formaldehyde by the McLafferty rearrangement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210031116
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  • 8
    Electronic Resource
    Electronic Resource
    The elimination of small neutral molecules in the mass spectra of substituted cyclic polyfluorinated alkenyl alcohols (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 4 (1970), S. 461-474 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Twelve substituted cyclic polyfluorinated alkenyl alcohols are synthesized and studied by mass spectrometry. Their characteristic fragmentation modes are discussed. The consecutive eliminations of HF and CO are dominant features in these spectra.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210040147
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  • 9
    Electronic Resource
    Electronic Resource
    Structure of hygromycin B, an antibiotic from Streptomyces hygroscopicusPresented in part at the Ninth Interscience Conference on Antimicrobial Agents and Chemotherapy, Washington, D.C., October 27-29, 1969.; The use of CMR. spectra in structure determination, I (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 2314-2319 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Antibioticum Hygromycin B, eine Verbindung C20H37N3O13 aus Streptomyces hygroscopicus, wurde hydrolytisch gespalten und die Spaltprodukte charakterisiert und identifiziert. Die Kenntnis ihrer Struktur und die Interpretation von 13C-NMR.- (CMR.)- Spektren führten zur Strukturaufklärung des Antibiotikums.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530846
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal transitions in mixtures of polydeoxyribodinucleotides (1970)
    New York : Wiley-Blackwell
    Biopolymers 9 (1970), S. 1105-1117 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oligo d(C-A) and oligo d(T-G) of known average lengths, prepared by a combination of chemical and enzymatic procedures, have been mixed in 0.02 M and 0.07 M Na+, and absorbance has been studied as a function of increasing temperature. The transitions have been analyzed for the temperature of maximum slope Tm, the breadth of the transition, the value of the slope at Tm, and the maximum hyperchromicity. Linear expressions have been found relating the inverse of the length in nucleotide units (n-1) of the shorter oligomer, irrespective of its identity, to Tm and also to the transition breadth. From a difference in slope between the Tm versus n-1 expressions for the two molarities, the entropy and enthalpy of melting have been calculated as a function of n-1.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1970.360090911
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