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  • Articles  (226)
  • Chemistry  (170)
  • Humans  (56)
  • Analytical Chemistry and Spectroscopy  (20)
  • 1985-1989
  • 1980-1984  (226)
  • 1975-1979
  • 1982  (226)
  • Physics  (193)
  • Biology  (91)
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  • Articles  (226)
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  • 1985-1989
  • 1980-1984  (226)
  • 1975-1979
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  • 1
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    Sex and handedness differences in cerebral blood flow during rest and cognitive activity (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-08-13
    Description: Cognitive activity resulted in increased flow of blood to the cerebral hemispheres. The increase was greater to the left hemisphere for a verbal task and greater to the right hemisphere for a spatial task. The direction and degree of hemispheric flow asymmetry were influenced by sex and handedness, females having a higher rate of blood flow per unit weight of brain, and females and left-handers having a greater percentage of fast-clearing tissue, presumably gray matter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gur, R C -- Gur, R E -- Obrist, W D -- Hungerbuhler, J P -- Younkin, D -- Rosen, A D -- Skolnick, B E -- Reivich, M -- MH 30456/MH/NIMH NIH HHS/ -- NS-10939-09/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1982 Aug 13;217(4560):659-61.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7089587" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Brain/metabolism/*physiology ; *Cerebrovascular Circulation ; *Cognition ; Female ; *Functional Laterality ; Humans ; Male ; Metabolic Clearance Rate ; Rest ; *Sex Characteristics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    The utilization of DSC in studies of oligomers (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 3591-3595 
    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: Oligomers are potentially useful as well characterized models for studying the chemical and physical properties of their long chain homologues. These model compounds are often available only as mixtures which must be separated. This separation may be accomplished using chromatographic techniques, i.e., GPC. Polydispersity (Mw/Mn) is often used as a criteria for the extent to which separation has been achieved. Values of polydispersity of 1.01-1.03 are considered indicative of very narrow fractions in the high polymer area. A purpose of this paper is to show that such low values of polydispersity are misleading when applied to oligomers containing 2-20 repeat units. Further, the existence of a single “sharp” melting endotherm is not necessarily proof that one has separated out a single molecular weight component. An intimate mixture of different molecular weight oligomers can give a single narrow endotherm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270933
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  • 3
    Electronic Resource
    Electronic Resource
    Design of laboratory continuous-culture equipment for accurate gaseous metabolism measurements (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 847-856 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The accuracy of kinetic and stoichiometric data obtained from most laboratory-scale continuous-culture equipment, particularly involving gaseous measurements, may be much lower than many workers realize, despite the use of good quality instruments. For example, errors in specific oxygen uptake measurements (QO2) easily can be as high as ±100%. This article assesses the accuracies of individual instruments and of the overall system in greater detail than has previously been reported and suggestions are made as to how the errors can be reduced to acceptable levels.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240408
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  • 4
    Electronic Resource
    Electronic Resource
    The density of protein precipitates and its effect on centrifugal sedimentation (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 127-141 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Isoelectric soya-protein precipitate densities were measured for mean particle sizes ranging from 3.4-65 μm by gradient centrifugation, centrifugation in water-immiscible solvents, tracerdilution, gravity sedimentation of isolated particles. Coulter counter volume determination, and a comparison of Coulter counter and centrifugal sedimentation size distributions. The immiscible system and tracer dilution methods were both found to be unreliable due to experimental uncertainties. The Coulter counter volume measurement indicated the existence of a density-size relationship with the aggregate density decreasing as the size increased. Comparison with sedimentation measurements showed that the Coulter counter measures 80% of the total aggregate volume for 6-μm particles. The relation between aggregate density (ρa, kg m -3) and size (d, μm) was measured for isoelectric soya protein and casein precipitated by ammonium sulfate, using a comparison of the Coulter counter size distribution and centrifugal sedimentation. The functions were described for soya by \documentclass{article}\pagestyle{empty}\begin{document}$$ \rho _a - 1004 = 246d^{ - 0.408} $$\end{document} and for casein by \documentclass{article}\pagestyle{empty}\begin{document}$$ \rho _a - 1136 = 31d^{ - 0.441} $$\end{document} The gradient centrifugation method measured the buoyant density of hydrated protein precipitate which was independent of size, and is consistent with an aggregate structure consisting of primary particles. However, the aggregate structure was not described for all sizes by the theoretical cubic packing of hard-sphere primary particles, nor by the successive random addition of primary particles. The density-size functions indicated up to a fivefold difference in Stokes settling velocities compared to those calculated assuming a constant density difference.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240111
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of temperature on the monomer reactivity ratios of 2-Hydroxypropyl methacrylate with ethyl- and butyl-acrylates (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 105 (1982), S. 83-90 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2-Hydroxypropylmethacrylat wurde mit Ethylacrylat und n-Butylacrylat in Masse bei Temperaturen zwischen 60 und 100°C copolymerisiert unter Verwendung von Benzoylperoxid als Initiator. Die Zusammensetzung der Copolymeren wurde durch Hydroxylgruppenbestimmung analysiert; die Copolymerisationsparameter wurden nach der Kelen-Tüdös-Methode berechnet. Die Arrheniusparameter wurden abgeleitet, und die Grenzviskositäten und das thermische Verhalten der Copolymeren wurden ebenfalls untersucht.
    Notes: 2-Hydroxypropyl methacrylate has been copolymerized with ethyl acrylate and n-butyl acrylate in bulk at temperatures between 60 and 100°C using benzoyl peroxide as initiator. The compositions of copolymers have been analyzed by hydroxyl determination; the reactivity ratios have been calculated by Kelen-Tüdös method. Arrhenius parameters have been derived. The intrinsic viscosities and the thermal behaviours of the copolymers were also studied.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051050109
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  • 6
    Electronic Resource
    Electronic Resource
    Optimization of fiber drawing processes in terms of the filament state variables (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 329-344 
    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: A new method of optimizing the fiber drawing process involving the feed roll, the heated elements and the take-up roll is presented. In this method, the process is described in terms of the filament temperature and filament extension in the drawing zone. This is in contrast to the conventional approach in which the machine control variables such as the heated element temperature, fiber feed velocity and the total draw ratio were used to describe the process. It is shown that the drawing process seldom proceeds by a simple yielding mechanism and that a one-step drawing process usually involves a yield draw followed by a post-yield stretching. Using the drawing of nylon 6 fibers as an example, it is shown that the most critical factors related to achieving the highest fiber strength in drawing from a given precursor are the yarn temperature and yarn extension at yielding and during the post-yield drawing.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760220602
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanical properties of blends containing HDPE and PP (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 2351-2360 
    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 mechanical properties of binary blends of high-density polyethylene and polypropylene are quite good compared to those for blends of some other immiscible pairs. The property relationships observed depend strongly on the process used to fabricate the blends as shown by comparisons of specimens made by injection and compression molding with widely varied cooling rates in the latter. Strength and modulus may show additive behavior or have positive or negative deviations, depending on the process conditions; however, measures of ductility like impact strength or elongation at break always show negative departures from additivity and exhibit minima in some cases. Addition of an appropriate ethylene-propylene elastomer greatly improves the ductility of these blends but with a corresponding decrease in strength and modulus. The presence of weld lines has a serious detrimental effect on mechanical properties of these blends.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270704
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  • 8
    Electronic Resource
    Electronic Resource
    Surface oxidation of cis-trans polybutadiene (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1269-1276 
    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: Uncrosslinked cis-trans polybutadiene films were prepared on ultraclean glass microscope slides by uniform dipping. The samples were stored in different environments prior to evaluation of surface oxidation by dynamic contact angle using the Wilhelmy plate method and by X-ray photoelectron spectroscopy (XPS). Storage conditions evaluated were: (1) laboratory air at 20°C and 30% relative humidity; (2) vacuum at 0.1 torr; (3) distilled water equilibrated with air; and (4) degassed distilled water. XPS and contact angle analysis indicate that samples exposed to air undergo significant surface oxidation within 8 h. Exposure of polybutadiene to air-equilibrated water results in slower oxidation. Samples stored in degassed water demonstrated less surface oxidation. Vacuum-stored samples demonstrated the least surface oxidation. Dynamic contact angle measurements demonstrated that receding contact angles are more sensitive to changes in surface oxidation than are advancing contact angles, as expected. Changes in surface wetting characteristics are readily observed after only 1 h in laboratory air, although XPS analysis does not show evidence of oxidation within 4 h of air storage.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270416
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of polymerization of styrene. The catalyst system Cu2Cl2 + AlEt3 in n-hexane (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 4861-4866 
    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: Studies on polymerization of styrene by the heterogeneous catalyst system Cu2Cl2 + AlEt3 are reported. Kinetic studies carried out at an optimum catalyst composition [Al]/[Cu] = 0.8 and aging time of 4 h give a value of 55 kJ/mol for the activation energy. The rate law can be presented as R = K [cat] [mon]2. A radical mechanism is proposed on the basis of the effect of hydroquinone and ESR spectra. The mechanism of polymerization with this catalyst system is different than that of CuCl2 + AlEt2X (X = Br, Cl), which was reported earlier.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070271230
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  • 10
    Electronic Resource
    Electronic Resource
    Modifizierte ozonolyse zur bestimmung von internen doppelbindungen in polyvinylchlorid (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 104 (1982), S. 145-161 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The determination of internal double bonds in PVC by oxidative chain scission with ozone in tetrachloroethane (TCE)-solution at -20°C can be quickly and easily performed measuring directly the intrinsic viscosities of samples during the reaction. Using a series of PVC-standards, the evaluation of the Mark-Houwink constants for TCE as solvent resulted in K = 0.027 [cm3/g] and α = 0.75. 1H-NMR-spectroscopic studies of the ozonolysis of model compounds as oleic acid and low molecular PVC fractions provided some information on the mechanism of the ozonolytic scission under the applied reaction conditions.
    Notes: Die Bestimmung der internen Doppelbindungen in PVC ist durch oxidative Spaltung mit Ozon in Tetrachlorethan (TCE)-Lösung bei - 20°C schnell und einfach möglich, indem die Grenzviskositäten der vor und während der Ozonolyse entnommenen Proben direkt im Reaktionsmedium ermittelt werden. Die zur Berechnung der Molekulargewichte benötigten und mit einer Reihe von PVC-Eichsubstanzen für TCE ermittelten Konstanten der Viskositäts-Molekulargewichts-Beziehung sind K = 0,027 [cm3/g] und α = 0,75. Durch 1H-NMR-spektroskopische Untersuchung von Modellverbindungen wie Ölsäure und niedermolekularen Anteilen aus PVC konnte ein Einblick in den Mechanismus der ozonolytischen Spaltung unter den ausgearbeiteten Reaktionsbedingungen erhalten werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051040113
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