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  • Artikel  (287)
  • Chemistry  (287)
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  • 1980-1984
  • 1970-1974  (287)
  • 1890-1899
  • 1972  (287)
  • Chemie und Pharmazie  (287)
  • 1
    Digitale Medien
    Digitale Medien
    A valid method of calibration which includes correction for dispersion in gel permeation chromatography (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 3353-3360 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Two independently derived distribution function methods validate both the calibration curve and the dispersion correction of the “effective linear calibration” method used in gel permeation chromatography (GPC). Experimental conditions are specified for making the method more useful by permitting linear extrapolation of the calibration line, \documentclass{article}\pagestyle{empty}\begin{document}$ V_R = C_1 + C_2 \log M, $\end{document} and for using a minimum number of standards. The independent methods quantitatively relate known differential of integral distribution functions for standard samples to their respective chromatograms. As such, they are useful calibration methods also, but are limited in scope and range.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1972.070161224
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  • 2
    Digitale Medien
    Digitale Medien
    Infrared spectroscopy of human amyloid fibrils and immunogolbulin proteinsFor reprints, write to : Dr. J. D. Termine, Labortory of Biological Structure, National Institute of Dental Research, National Institutes of Health, Bethesda, Maryland 20014. (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 1103-1113 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The presence of the antiparallel-β-pleated sheet coformation io isolated human amyloid protein fibrils has been confirmed by infrared spectroscopy. In most amyloid samples, this conformation was enhanced by acidic solution conditions. Infrared spectroscopy (Amide I and Amide V absorption bands) and x-ray diffraction methods were also used to examine the immunoglobulin molecule for solid state-β-structure. It was found that both heavy chains and Bence Jones proteins exhibited some β-pleated sheet content upon acid and/or heat treatment. Furthermore, pepsin digests comprising either the variable-rich region (Fd′) of the immunloglobulin heavy chain or in particular, filamentous variable segments of κ and λ Bence Jones proteins were, as isolated, very similar to amyloid in β-structure content. Data from other immunoglobulin-derived sample did not exhibit extensive β-pleated sheet content. On the other hand, most amyliod and immunoglobulin-derived samples did display some β-structure when cast from 50% HCOOH solution. Under these conditions, however, filamentous light chain-variable segments exhibited well-defined infrared patterns rich in antiparallel-β-pleated sheet structure and gave a “cross-β” x-ray diffraction pattern.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1972.360110512
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  • 3
    Digitale Medien
    Digitale Medien
    Thermal transitions in gelatin: Optical rotation and enthalpy changes (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 2521-2532 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Enthalpy changes [as determined by differential scanning calorimetry (DSC)] and optical rotation changes over the helix → coil transition were measured for various gelatin solutions and films. From these studies it has been concluded that: (1) a linear correlation between ΔH and Δ[α] exists for gelatin solutions, independent of the temperature at which gelation occurred; (2) the amount of triple helical structure regained when a melted gelatin solution is quenched can be calculated from DSC data, but the values obtained will be dependent on assumptions about the number and strength of hydrogen bonds; (3) the anomalously high levorotation values found for cold-dried films of gelatin do not reflect the presence of an extraordinarily large amount of triple helical structure; rather, the large rotations appear to be the result of orientation of helices in the plane of the film.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1972.360111211
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal stability of poly(vinyl fluoride) film (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 3039-3040 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1972.070161127
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  • 5
    Digitale Medien
    Digitale Medien
    Stability of time-delay systems (1972)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 380-384 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: A direct method is presented for determining both local and regional stability of systems described by nonlinear differential-difference equations. Prediction of stability is with respect to a general class of initial curves. The practical as well as the conservative nature of the procedure is demonstrated by a numerical example.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690180221
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  • 6
    Digitale Medien
    Digitale Medien
    Nucleation kinetics of the potassium sulfate-water system (1972)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 798-807 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Secondary nucleation in the potassium sulfate-water system occurs by micro-attrition processes over the entire 1.3-26 μ size range of this study. Experimental nucleation rates were correlated with power-law kinetics expressions in terms of supersaturation, the fourth moment of the parent seed-crystal distribution, and stirring rate. Such kinetics expressions are similar to those used to correlate MSMPR data; however, the secondary nucleation rates of this paper are two orders of magnitude greater than those reported in previous MSMPR studies of the same system. An upper bound on growth rate of these nuclei was calculated based on a population balance analysis; maximum growth rates of these nuclei was markedly size-dependent in the 1.3-26 micron size range of measurement, decreasing with decreasing size. The apparent descrepancy between these nucleation rates and MSMPR values can be explained by nuclei washout during the low growth rate period. Anomalous MSMPR kinetics (low or even negative supersaturation power-law dependence) can be explained by this growth phenomenon.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690180423
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  • 7
    Digitale Medien
    Digitale Medien
    Interfacial instability and spontaneous formation of microemulsions (1972)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 1116-1120 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Microemulsions, which are optically transparent oil-water dispersions, were spontaneously produced upon mixing hexadecane, hexanol, potassium oleate, and water in specific proportions. The drop-volume measurements of hexadecane-water interface in the presence of hexanol or potassium oleate revealed that these surfactants decrease the interracial tension of the hexadecane/water interface. It is proposed that the interaction between these two emulsifiers at the oil-water interface causes spontaneous negative interfaical tension resulting in interfacial instability and the formation of microemulsions.As the amount of water is increased, the microemulsion exhibits a clear to turbid to clear transition. Unlike the clear regions, the turbid region possesses birefringence. The development of birefringence is also accompanied by a sharp decrease in electrical resistance. High-resolution (220 Mc) nuclear magnetic resonance data suggest that water exists in two distinct environments or structures in the birefringent region. The electrical, birefringence, and nuclear magnetic resonance data agree with the proposed mechanism of phase-inversion of microemulsions, which can be described as water spheres to water cylinders to water lamellae to a continuous water phase. The spontaneous formation of such structures (for example, water cylinders and lamellae) presumably depends upon the phase-volume ratio and the interfacial tension at the oil-water interface.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690180605
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  • 8
    Digitale Medien
    Digitale Medien
    Vibrational spectrum of cyclic tetra-L-alanine (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 2099-2108 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A normal coordinate analysis for cyclic tetra-L-alanine molecule is reported. A comparison of amide modes and other low-frequency vibrations sensitive to conformational changes is made with those in poly-L-alanine. Intramolecular coupling coefficients are calculated using perturbation treatment.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1972.360111010
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  • 9
    Digitale Medien
    Digitale Medien
    Structure of a styrene-butadiene-styrene block copolymer by light scatteringContribution No. 492.Based on a paper presented at the Meeting of the American Physical Society, Division of High Polymer Physics, Cleveland, Ohio, April 29 - May 1, 1971. (1972)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 27 (1972), S. 219-222 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: The phase structure of a styrene-butadiene-styrene block copolymer (mol. wt. 21 000-98 0000- 21 000) film cast from tetrahydrofuran/methyl ethyl ketone is studied by light scattering. The scattered intensity I corresponding to Vv, Hv, Vh, and Hh polarization directions is measured as a function of scattering angle. From the In I vs sin2 (θ/2) plots the domain sizes are found to be about 0.4 and 1.0 μ. The a values are independent of polarization directions. This proves that the domains are geometrically isotropic. The two sizes correspond to two correlation distances; the smaller value represents the extent of heterogeneity within a spherical domain and the larger valued the inter-domain separation distance.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1972.050270117
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  • 10
    Digitale Medien
    Digitale Medien
    Polyisocyanurate foams (1972)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 12 (1972), S. 167-178 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: An experimental program was conducted to study the thermochemical and flammability characteristics of an improved polyisocyanurate foam, uncoated and coated either with fluorinated copolymer or an intumescent material. Testing methods included thermal analysis; scanning electron microscopy; infrared photography; infrared spectroscopy; HLT-15, ASTM D-1692, Bureau of Mines Penetration, and XP-2 smoke chamber flammability tests; limiting oxygen index (LOI); and a moderate-scale fire simulation test. The uncoated and coated foams were found to have excellent flammability and insulation characteristics, although smoke development was substantial.
    Zusätzliches Material: 22 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760120303
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