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
Filter
  • Chemistry  (237)
  • Organic Chemistry  (20)
  • PROPULSION SYSTEMS
  • SPACE RADIATION
  • Wiley-Blackwell  (237)
  • 1970-1974  (139)
  • 1960-1964  (84)
  • 1945-1949  (14)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (237)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Some aspects of orientation in injection molded objects (1972)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 358-363 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The birefringences of injection molded plates and the birefringence during steady, isothermal shear flow were compared for some amorphous polymers. The materials studied were a polystyrene, a “toughened” polystyrene and an acrylonitrile-butadiene-styrene copolymer. The birefringence of the plates, notably the maximum value for the average over the thickness was found to be related to the shear stress at the cavity wall that had occurred during the mold filling process. This relationship was independent of temperature. To a good approximation, it was also the same as the relationship between the flow birefringence and the shear stress at the wall in isothermal channel flow. It thus appears that the anisotropy of injection molded objects is dominated by the shear stresses during the mold filling process regardless of the temperature and of the macroscopic rate of deformation.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760120508
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Internal field emission in carbon black-loaded natural rubber vulcanizates (1962)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 6 (1962), S. 651-655 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The nonohmic behavior of carbon black-loaded natural rubber viilcanizates was studied. Three samples contained high-abrasion furnace black (HAF) in good, moderate, and poor dispersion. Another sample contained a good dispersion of medium thermal black (MT). The nonohmic behavior of the poor HAF dispersion and that of the MT dispersion could be interpreted as due to internal field emission acroM insulating gap widths of 2 and 2.5 μ. The existence of such gaps waa confirmed by electron micrographs. No clear evidence of internal field emission could be obtained for the good and moderate HAP dispersions where, according to electron micrographs, the gaps are much narrower. There is some indication that the degree of diapersion can be correlated with field emission characteristics.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1962.070062408
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Synthesen von Cholinphosphatiden, VI1) 3-Palmitoyl-glycerin-1-phosphorylcholin (D-α-Lysolecithin) und dessen Unwirksamkeit als Substrat für Acyltransferasen (Lecithin-Synthese) (1970)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 738 (1970), S. 161-169 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Choline Phosphatides, VI1).3-Palmitoyl-glycerol-I-phosphorylcholine (D-α-LySO-lecithin) and its Inactivity as Substrate for AcyltransferasesEnzyme reactions controlling the content of the strong lytic agent lysolecithin (monoacylglycerol-3-phosphorylcholine) in cell membranes, i. e. by degradation or by reacylation, are of great importance for the living cell. Lysolecithins, well defined with respect to configuration and structure, can be used as substrates for studying the metabolic fate of these compounds in membranes. Five of the six theoretically possible isomers of lysolecithin have been prepared by De Haas and Van Deenen (1965). - In this paper the synthesis of the hitherto unknown 3-acyl-glycerol-I-phosphorylcholine (B) is described. 3,4-lsopropylidene-D-mannitol (1) has been benzylated to give 1,2,5,6-tetrabenzyl-3,4-isopropylidene-D-mannitol (2). Acid hydrolysis
    Notes: Als Modellsubstanzen für biologische Untersuchungen sind einheitliche, konfigurativ eindeutige Lysolecithine von allgemeinem Interesse. Wir beschreiben erstmals die Synthese eines 3-Acyl-glycerin-1-phosphorsäurecholinesters (B) 3.4-Isopropyliden-D-mannit (1) wird zur Tetrabenzyl-Verbindung 2 benzyliert. Saure Hydrolyse von 2 ergibt 1.2.5.6-Tetrabenzy-D-mannit (3), der mittels Bleitetraacetat zu 1.2-Dibenzyl-glycerinaldehyd (4) Gespalten wird. Reduktion von 4 mit Lithiumalant führt zum 1.2-Dibenzyl-glycerin(5), das durch Veresterung mit Palmitinsäurechlorid das 3-Palmitoryl-Dibenzyl 6 liefert. Aus 6 erhält man bei der katalytischen Hydrogenolyse 2-Benzyl-und 1-Benzyl-3-palmitoyl-glycerin (7bzw. ),die chromatographisch getrennt werden . die Phosphorylierung von 7 mittels ß-Brom-äthyl-dichlorphosphat und die nachfolgende Behandlung mit Trimethylamin ergeben 3-Palmitoyl 2-benzyl-glycerin-1-phosphorylcholin (9), das durch katalytische Hydrogenolyse in 3-Palmitoyl-glycerin-1-phosphorylcholin (10) umgewandelt wird. - Das so dargestellte D-αLysolecithin erweist sich im Gegensatz zu 1 -Palmitoyl-glycerin-3-phosphorylcholin (L-α-Lyso-lecithin) nicht als Substrat für Acyl-CoA : Acylglycerinphosphorylcholin-Acyltransferasen,
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19707380118
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The mass spectra of some pyrazole compounds (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1549-1559 
    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 ten pyrazole compounds have been determined. Fragmentation schemes have been derived by means of the metastable defocusing method. The predominant process is cleavage of the nitrogen-nitrogen bond resulting in expulsion of HCN. The process second in prominence is the loss of a nitrogen molecule after initial removal of a hydrogen radical or a substituent, giving the species [C3H2R]+, probably a cyclopropenyl ion. In general, the fragmentation pattern is strongly influenced by the substituent.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210031213
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Preference factors and isotope effects in the loss of H. (D.) and HCN (DCN) from deuterated pyrazoles upon electron-impact (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 1101-1105 
    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 deuterated pyrazoles show that loss of H. and of HCN from the molecular ion occurs with a very high specificity from the 3(5)-position. For the two processes isotope effects and preference factors have been determined. Metastable ion decompositions involving the loss of HCN from the [M - H] -fragment indicate that the identity of the hydrogen atoms in this fragment is lost to a large extent.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050910
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Fragmentation behaviour and ring expansion of 1-methylimidazole and 1-methylpyrazole upon electron-impact (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1165-1172 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The relative losses of unlabelled vs. labelled HCN from the [M]+· and [M - 1]+ ions of a number of specifically labelled 1-methylimidazoles (I) and 1-methylpyrazoles (II) have been determined. Hydrogen randomisation in the molecular ions prior to fragmentation is insignificant. Expulsion of HCN follows two distinct pathways: elimination involving positions 2 and 3 (predominant in I) and elimination involving the methyl group and the nitrogen atom at position 1 (predominant in II). The molecular ions eject H· from the methyl groups to a high degree of specificity. In both cases some contribution by position 5 is observed. The resultant [M - 1]+ ions exhibit extensive, but incomplete hydrogen randomisation. Loss of HCN from these ions is consistent with intermediacy of ring-expanded ions, but notably in II a proportion of the HCN is generated from the group. A mechanism for this observation is presented.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071005
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Loss of HCN and H⋅ from the molecular ion of imidazole (1972)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 6 (1972), S. 1363-1368 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The behaviour of a number of deuterated imidazoles upon electron-impact has been studied. Loss of H⋅ from the molecular ion occurs specifically at the 4(5)-position. Loss of HCN is less specific, the order being 2 〉 4(5) ≫ 1.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210061211
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The construction of an isokinetic sucrose gradient by means of a simple electronic simulation and the application to the fractionation of a mixture of macromolecules (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 143 (1971), S. 67-72 
    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 Nützlichkeit eines isokinetischen Gradienten für die Trennung von Makromolekülen in einem Gravitationsfeld wird diskutiert.Eine einfache Methode zur Herstellung von beliebigen exponentiellen Gradienten durch ein Simulationsverfahren mit einem Oszilloskop und einem Rechteckwellengenerator wird beschrieben.
    Notes: The usefulness of an isokinetic gradient for the separation of macromolecules in a gravitational field has been discussed.An easy way to construct any exponential gradient by means of a simulation-process with an oscilloscope and a square pulse generator has been described.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021430107
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Reaction of N-chlorosulfonylisocyanate with unsaturated polymers. Route to a synthesis of polyampholytes (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 11 (1973), S. 169-172 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.130110305
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Electrochemical transformations of polymeric acid solutions. I. Crossed Koble synthesis (1964)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 2 (1964), S. 5187-5202 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(methacrylic acid) was electrolyzed at 20°C. in 0.2 M dry methanol solution in a glass apparatus provided with two polished platinum disk electrodes; the current density was kept constant (300, 800, or 1000 ma.). Before electrolysis the acid was partially neutralized in order to increase the electrical conductivity. The electrolysis was characterized by evolution of carbon dioxide at the anode, while the acid content of the polymer decreased. When the degree of decarboxylation was about 30%, intramolecular lactonization occurred by interaction of unsaturated groups with neighboring acid groups. The changes of chemical composition of the polymer in function of the time were followed by determination of free carboxylic acid groups, of γ-lactones, and unsaturated groups (bromine addition). The amount of methyl ester formed by methanolysis of the lactones was calculated from methoxyl determinations. At the end of electrolysis only 5-6% free carboxylic groups were present, 35-40% lactones, 30% ester groups; the residue was mainly a hydrocarbon fraction (partially unsaturated). The electrolysis was also carried out in the presence of low molecular weight carboxylic acids, acetic, ∊-acetaminocarproic, and cyanoacetic acids, the ratio of the concentration of these acids to that of polymeric acid being varied over a wide range. With acetic acid the chemical composition of the polymer was only slightly affected through grafting of side methyl groups, as was shown by the use of C14 acetic acid. With ∊-acetaminocaproic and cyanoacetic acids the crossed Kolbe synthesis reactions are much more important, 20-24% side alkyl acetamino groups and 15% cyanomethylene groups being grafted to the main chain by this method. Chain degradation during these experiments can be practically avoided.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1964.100021215
    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...