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  • Wiley-Blackwell  (37)
  • American Physical Society  (22)
  • American Geophysical Union  (21)
  • Copernicus
  • 1975-1979  (80)
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Keywords
Publisher
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Estimation of the circular dichroism exhibited by statistical coils of poly(L-alanine) and unionized poly(L-lysine) in water (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2025-2033 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The circular dichroism of Ac-(Ala)x-OMe and H-Lys-(Lys)x-OH with x = 1, 2, 3, and 4 has been measured in aqueous solutions. The oligomers with x = 4 show similar circular dichroism spectra in water when the lysyl amino groups are protonated, and they respond in similar fashion to heating and to sodium perchlorate. Both oligomers at 15°C exhibit a positive circular dichroism band at 217-218 nm, which is eliminated by the isothermal addition of 4 M sodium perchlorate or by heating. The positive circular dichroism of the lysine oligomer is also eliminated when the pH is elevated to deprotonate the amino groups. Positive circular dichroism is still observed for Ac-(Ala)4-OMe at elevated pH. Circular dichroism spectra have been estimated for poly(L-alanine) and poly(L-lysine) as statistical coils under the above conditions, based on the trends established with the oligomers. Poly(L-lysine) and poly(L-alanine) are predicted to exhibit similar circular dichroism behavior in aqueous solution so long as the lysyl amino groups are protonated. The circular dichroism of the statistical coil of poly(L-lysine), but not poly(L-alanine), is predicted to change when the pH is elevated sufficiently to deprotonate the lysyl amino groups. These results suggest that the unionized lysyl side chains participate in interactions that are not available to poly(L-alanine). Hydrophobic interactions may occur between the unionized lysyl side chains. Protonation of the lysyl amino groups is proposed to disrupt these interactions, causing poly(L-alanine) and protonated poly(L-lysine) to have similar circular dichroism properties.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360141004
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum science. Methods and structure. Edited by J.-L. Calais, O. Goscinski, J. Linderberg, and Y. Öhm. Plenum Press, New York, 1976. 595 pages. Price: $49.50 (1977)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 11 (1977), S. 1043-1043 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560110617
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  • 3
    Electronic Resource
    Electronic Resource
    Heuristic intermolecular potential function for the methane-water interaction based on ab initio quantum-mechanical calculations (1978)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 14 (1978), S. 319-327 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An analytical potential function for the pairwise interaction of methane and water is reported. The function is representative of 225 ab initio quantum-mechanical calculations of the intermolecular interaction using 6-31G self-consistent-field molecular-orbital theory. The statistical parameters of the curve fitting are given and isoenergy contour maps of the interaction energy are presented and discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560140310
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum mechanics of molecular conformations. Edited by Bernard Pullman. John Wiley & Sons, London, 1976. 412 pages. Price: £ 16.00 ($30.00) (1977)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 11 (1977), S. 1045-1045 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560110618
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  • 5
    Electronic Resource
    Electronic Resource
    Introduction of carboxyl groups into crosslinked polystyrene (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 267-274 
    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: Carboxylgruppen Können in vernetztes Polystyrol über einen Zweistufenprozeß durch 2-Chlorbenzoylierung und Aufspaltung des Reaktionsproduktes mit einer Mischung von Kalium-tert-butoxid und Wasser eingeführt werden. Den Umsatz kann man durch die Gewichtsänderung des Harzes und durch Chloranalyse leicht abschätzen. Carboxylgruppen können auch durch Benzoylierung eingeführt werden. Das bereits beschriebene Verfahren, um Carboxylgruppen einzuführen, indem man vernetztes Polystyrol chlormethyliert, das erhaltene Produkt zu einem Formylharz oxidiert und dieses Produkt zu einem Carboxylharz weiteroxidiert, kann durch die Verwendung von Peressigsäure in Methansulfonsäure als Oxidationsmittel im letzten Schritt verbessert werden.
    Notes: Carboxyl groups can be introduced into crosslinked polystyrene by a two step process involving 2-chlorobenzoylation and cleavage of the product using a mixture of potassium tert-butoxide and water. The reaction yields can be estimated easily by the change in weight of the resin and by chlorine analysis. Carboxyl groups can also be introduced via benzoylation. The previously described method of introducing carboxyl groups, in which crosslinked polystyrene is chloromethylated and the product oxidized to a formyl resin, which is then oxidized to a carboxyl resin, can be improved by using peracetic acid in methanesulphonic acid as the oxidant in the last step.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760202
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  • 6
    Electronic Resource
    Electronic Resource
    Cytological examination of reduction bodies of Corvomeyenia carolinensis harrison (Porifera: Spongillidae) (1975)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 145 (1975), S. 483-491 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Freshwater sponges, Corvomeyenia carolinensis Harrison, were placed into tap water to induce degenerative reduction body formation. Reduction bodies were examined using light and electron microscopy in order to define their histochemical and ultrastructural characteristics. The reduction body of freshwater sponges is an extremely simple developmental system consisting primarily of an archeocyte reserve delimited by a simple squamous pinacoderm. The freshwater sponge reduction body displays many similarities to overwintering phases of marine sponges. The system presents an unusually straightforward vehicle for investigations of degeneration and regeneration as processes in developmental biology and may represent a reasonable vehicle in which to examine the process of the genesis of lysosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051450406
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  • 7
    Electronic Resource
    Electronic Resource
    The cytology of the testaceous rhizopod Lesquereusia spiralis (Ehrenberg) Penard. I. Ultrastructure and shell formation (1976)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 150 (1976), S. 343-357 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Ultrastructure and shell formation in the testaceous ameba, Lesquereusia spiralis, were investigated with both scanning and transmission electron microscopy and X-ray microanalysis. The nucleus, surrounded by a fibrous lamina, contains multiple nucleoli. The cytoplasm, containing a well developed granular endoplasmic reticulum, also contains remnants of starch granules in stages of digestion. Spherical aggregates of ribosome-like particles may be seen. Golgi complexes seem to produce both a nonordered fibrous material and an electron dense vesicle. Only the latter appears to bleb off from the Golgi complex. X-ray microanalysis demonstration of silicon in Golgi vesicles and in some dense vesicles suggests that the fibrous component of the cisternae may take up and concentrate silica to form the electron-dense component of the vesicles. Membrane-bound siliceous crystals are often seen adjacent to the Golgi, suggesting either a Golgi origin or platelet formation in vesicles after release from the Golgi complex. Both electron-dense bodies and siliceous platelets are released from the cell by a process similar to apocrine secretion and may be seen outside the cell in route to the shell during shell morphogenesis. Shell development involves fusion of electron-dense bodies to form a matrix, positioning of siliceous platelets in this matrix parallel to the shell surface, and development of a system of matrix chambers. A particulate glycoconjugate is released to the shell surface upon rupture of the matrix chamber.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051500207
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  • 8
    Electronic Resource
    Electronic Resource
    The Gaseous Carburisation of Austenitic Steels (1979)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 30 (1979), S. 785-794 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Gasaufkohlung von austenitischen StählenDie vorliegende Arbeit behandelt das Korrosionsverhalten von Werkstoffen in aufkohlenden Medien bei hoher Temperatur: dabei wird zunächst der Stand der Kenntnisse auf diesem Gebiet erörtert. Anschließend werden Ergebnisse mitgeteilt, die mit drei Stählen des Typs 25 Cr 20 Ni in aufkohlenden Gemischen aus Wasserstoff und Methan bei kontrollierter Kohlenstoffaktivität (0,8 bei 825 und 1000°C) erhalten wurden Ebenso werden kinetische Daten für Versuchsdauern bis 1100 Stunden vorgelegt, wobei gezeigt werden kann, daß die Aufkohlung dieser Legierungen zum größten Teil nach kurzzeitiger Einwirkung der Gase bei 1000°C erfolgt. Auch die Bedeutung der Legierungszusammensetzung und der Oberflächenbeschaffenheit, besonders bei 825°C, werden gezeigt. Die Ergebnisse von Untersuchungen der Oberfläche und des Probenquerschnitts mittels optischen, elektronenoptischen und Durchstrahlungstechniken werden mitgeteilt. Mit Hilfe einer Kern-Mikrosondentechnik war es möglich, Konzentrationsprofile für Kohlenstoff genau zu ermitteln und Diffusionskoeffizienten für die drei Legierungen zu berechnen. Außerdem wurde eine magnetische Technik zur zerstörungsfreien Überwachung der Aufkohlung unterhalb der Oberfläche auf ihre Anwendbarkeit geprüft.
    Notes: The paper is concerned with the corrosion behaviour of materials in high temperature gaseous carburisation environments and initially reviews the current ‘state-of-the-art’ in this field. Results of investigations carried out on three 25 Cr-20 Ni steels exposed to carburising H2-CH4 mixtures with a controlled carbon activity of 0.8 at 825°C and 1000°C are then presented.Kinetic data for exposure periods of up to 1100 hours are given and it is shown that gross carburisation of these alloys has occurred after only short exposures at 1000°C. The importance of alloy composition and surface condition, particularly during exposure at 825°C, is demonstrated.The results of surface and cross-sectional examinations using a range of optical, electron and X-ray techniques are reported. The use of a nuclear microprobe technique has enabled accurate carbon concentration profiles to be established and diffusion coefficients for the three alloys have been determined. In addition, the use of a magnetic technique for the non-destructive monitoring of the extent of sub-surface carburisation has been investigated.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19790301103
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  • 9
    Electronic Resource
    Electronic Resource
    The importance of coulombic interactions for the induction of β structure in lysine oligomers by sodium dodecyl sulfate (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 559-567 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Circular dichroism spectra have been obtained for tri(L-lysine), tetra(L-lysine), and penta(L-lysine) in aqueous sodium dodecyl sulfate at 25°C. None of the oligomers are affected significantly by sodium dodecyl sulfate at detergent concentrations exceeding 0.01 M. Literature results show that the high-molecular-weight polymer forms a β strucure under these conditions. At detergent concentrations near 3.5 × 10-4 M the penta(L-lysine), but not the smaller oligomers, undergoes a conformational change. Its circular dichroism under these conditions is essentially identical to that observed with poly(L-lysine) when it forms a β structure in sodium dodecyl sulfate. Solutions of the penta(L-lysine), which exhibit this modified circular dichroism, are also turbid, leading to the conclusion that the oligomer has formed an intermolecular β structure. When these experiments are conducted in the presence of 0.1 M sodium hydroxide, the sodium dodecyl sulfate produces neither turbidity nor a modified circular dichroism spectrum. These observations provide compelling evidence that Coulombic interaction between the anionic detergent head and the cationic lysyl amino groups is essential for the conformational change induced in penta(L-lysine) by sodium dodecyl sulfate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150311
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  • 10
    Electronic Resource
    Electronic Resource
    Tris-benzil crosslinked polyphenylquinoxalines (1976)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 16 (1976), S. 318-322 
    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: Polyphenylquinoxalines (PPQ) were crosslinked with a tris-benzil comonomer, to alleviate the inherenthigh temperature thermoplasticity, and evaluated as matrices in graphite reinforced composites. The room temperature flexural strength/modulus of Modmor IJ laminates were as high as 245,000 psi/16,6 × 106 psi. Essentially 100 percent retention of ambient mechanical properties was obtained at 371°C using a PPQ matrix from the fully-crosslinked polymer prepared from 4,4′-bis(4″-oxybenzilyl) benzil (BOBB) and 3,3′-diaminQbenzrdine. The degree of high temperature thermoplasticity in the composite was found to be more closely related to the final postcure temperature than to the BOBB crosslink density. The thermoplasticity essentially disappeared when the BOBB comonomer-PPQ laminates were postcured at 482-510°C in nitrogen. Substitution of DMAC for the commonly used m-cresol solvent system allowed facile preparation of prepreg to fabricate low-void laminates and NOL rings.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760160508
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