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  • 1990-1994  (3.243)
  • Chemistry  (3.243)
  • Analytical Chemistry and Spectroscopy  (465)
  • 1
    Digitale Medien
    Digitale Medien
    α-Elastin coacervate as a protein liquid membrane: Effect of pH on transmembrane potential responses (1992)
    New York : Wiley-Blackwell
    Biopolymers 32 (1992), S. 1173-1180 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A protein liquid membrane composed of coacervated α-elastin, a chemical fragmentation product of the biological elastic fiber protein, functioned as an amphoteric liquid ion-exchange membrane. Ionic permselectivities of the α-elastin coacervate membrane to a series of metal chlorides were investigated for the concentration-cell systems by the ordinary electrochemical measurements. Effects of pH on the transmembrane potential responses for NaCl, CaCl2, and MgCl2 systems were examined. Only in the Ca2+ -containing system did potential responses stay at constant levels against the pH changes, whereas in the other systems, increasing pH caused potential changes, indicating a improvement of cationic permselectivity across the α-elastin coacervate membrane. It was suggested that the characteristic Ca2+ transport mechanisms across the α-elastin coacervate membrane are related in some way to the polypeptide backbone interactions specific and selective to Ca2+ ions. © 1992 John Wiley & Sons, Inc.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.360320906
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  • 2
    Digitale Medien
    Digitale Medien
    Characterization of grafted jute fiber by optical and scanning electron microscopy (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 25-30 
    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: Raw and partially delignified jute fibers were grafted with acrylonitrile and methyl meth-acrylate monomers, using the redox system of initiation with ceric ammonium sulfate. Grafting was also carried out in a mixed monomer system with acrylonitrile and methyl methacrylate monomers in different proportions. The optimum grafting condition depends on the duration of grafting treatment and proportion of grafting monomers. The monomers entered the fiber matrix with high add-on and, at still higher graft add-ons, the ultimate fibers suffered disintegration. The surfaces were increasingly covered with grafted materials and longitudinal cracks developed on the fiber surface with higher add-on. © 1993 John Wiley & Sons, Inc.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1993.070490104
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  • 3
    Digitale Medien
    Digitale Medien
    Bone-particle-impregnated bone cement: An in vivo weight-bearing study (1991)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 25 (1991), S. 141-156 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: To evaluate an experimental inorganicbone-particle-impregnated bone cement, canine hip prostheses were implanted in dogs using a regular bone cement on one side and the experimental bone cement on the other. In a preliminary feasibility study, bone ingrowth into the resorbed bone-particle spaces was established 3 months after implantation in three dogs. In a more detailed study, twenty-eight (28) dogs were divided in four groups to delineate the effects of time on the phenomena of bony ingrowth. One month after implantation, active bone ingrowth into the bone cement was obvious. By 3 months postimplantation, the ingrowth appeared to have traversed the thickness of the bone-particle-impregnated cement. By the fifth month, most of the interconnected inorganic bone particles were replaced by new bone. At the end of a year, the ingrown bone was mature and negligible new bone activity was present. Biomechanical pushout tests closely corroborated the histologic observations. The maximum shear strength of the cement/bone interface of the experimental side reached 3.6 times that of the control side at 5 months postimplantation. No further improvements were seen at 12 months postimplantation. A viable bone/cement interface may result in a better orthopedic implant fixation system by combining the advantages of both cement for immediate rigidity and biological ingrowth for longterm stability.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820250202
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  • 4
    Digitale Medien
    Digitale Medien
    Electron beam initiated grafting of methyl methacrylate onto polyethylene: Structure and properties (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 217 (1994), S. 61-69 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Polyethylen (PE, 100 Gew.-Teile) wurde mit Methylmethacrylat (MMA, bis zu 5 Gew.-Teilen) gemischt und anschließend mit Elektronen (bis zu 20 Mrad) bestrahlt, um PE/MMA-Pfropfcopolymere herzustellen, deren Bildung mittels IR-Spektroskopie nachgewiesen wurde. Gelbildung wies auf eine Vernetzung während der Bestrahlung hin. Zunehmende MMA-Konzentration und höhere Bestrahlungsdosen verringerten die Kristallit-Schmelztemperatur und den Kristallisationsgrad des PE. Zugfestigkeit, Bruchdehnung und Dielektrizitätskonstante wurden gemessen und diskutiert.
    Notizen: Polyethylene (PE, 100 parts by weight) was mixed with methyl methacrylate (MMA, up to 5 parts by weight) at 120°C and subsequently exposed to electron radiation of different doses (up to 20 Mrad) to prepare PE/MMA graft copolymers. Successful grafting was verified by IR spectroscopy. Gel formation indicated crosslinking. Grafting increased with increasing MMA concentration and increasing irradiation dose. Crystalline melting temperature and percent crystallinity were lower than those of untreated PE. Tensile strength, elongation at break and dielectric constant of grafted samples were measured and discussed.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1994.052170107
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  • 5
    Digitale Medien
    Digitale Medien
    Acyloin condensation in aqueous system by durable polymer-supported thiazolium salt catalysts (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 1711-1717 
    Details
    ISSN: 0887-624X
    Schlagwort(e): durable catalyst ; thiazolium salt ; aqueous system ; acyloin condensation ; enzyme model ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We characterized three low-molecular-weight thiazolium salt analogues: N-methyl-5-(2′-benzyloxyethyl)-4-methylthiazolium iodide (MBMTI), N-methyl-4-phenylthiazolium iodide (MPTI), and N-methylbenzothiazolium iodide (MBTI). MBMTI, having high-electron density on the thiezolium ring, was found to be a durable thiazolium salt in buffer solution. Then, the polymer-supported thiazolium salt catalyst having MBMTI structure as a catalytic site for acyloin condensation was prepared by the polymerization of the corresponding thiazole monomer and the following quaternization. The polymer catalyst had excellent catalytic activity even in buffer solution, while the corresponding low molecular weight catalyst did not show any activity in aqueous system. Furthermore, the durable polymer catalyst could be reused under the aqueous condition. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1994.080320913
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  • 6
    Digitale Medien
    Digitale Medien
    Characterization of a recombinant antibody produced in the course of a high yield fed-batch process (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 44 (1994), S. 727-735 
    Details
    ISSN: 0006-3592
    Schlagwort(e): monoclonal antibody ; glycosylation ; cell culture ; fed-batch ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Many mammalian cell fed-batch processes rely on maintaining the cells in a viable and productive state for extended periods of time in order to reach high final concentrations of secreted protein. In the work described herein, a nonamplified NSO cell line was transfected with a vector expressing a recombinant human anti-HIV gp 120 monoclonal antibody (Mab) and a selectable marker, glutamine synthetase. A fed-batch process was developed which improved product yields tenfold over the yields reached in batch culture. In this case, the clone was cultured for a period of 22 days and produced 0.85 g Mab/L. To gauge the effect of extended culture lifetime on product quality, biochemical characteristics of MAb isolated from different time points in the fed-batch culture were determined. The apparent molecular weight of the MAb was constant throughout the course of the culture. Isoelectric focusing revealed four major charged species, with a fifth more acidic species appearing later in the culture. The antigen binding kinetics were constant for MAb isolated throughout the culture period. Glycosylation analysis, on the other hand, revealed that MAb produced later in the culture contained greater percentages of truncated N-acetylglucosamine and highmannose N-glycans. Possible contributions to this underglycosylated material from either cell lysis or synthesis from noviable cells were found to be negligible. Instead, the viable cells appeared to be secreting more truncated and high mannose MAb glycoforms as the culture progressed. © 1994 John Wiley & Sons, Inc.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260440609
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  • 7
    Digitale Medien
    Digitale Medien
    α-Methylierter Fencholen- und α-Campholenaldehyd - Synthese und Reaktionen (1993)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 687-693 
    Details
    ISSN: 0941-1216
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: α-Methylated Fencholenic and α-Campholenic Aldehyde - Synthesis and ReactionsThe syntheses of α-methylated fencholenic (6a) and α-campholenic aldehyde (6b) via the corresponding azomethines (5) are reported. Aldol condensations of 6a, b with following reductions give the allylic alcohols (12-16) and hydrogenation the saturated alcohols (17-21) with strong woody odors, some of the allylic alcohols resembling that of sandal wood. Simple reduction or oxidation of 6a, b give the alcohols (24, 27), ethers (26), esters (23, 25, 28) and ketones (29) which have interesting woody odors with spicy, earthy and herbaceous notes.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19933350807
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  • 8
    Digitale Medien
    Digitale Medien
    Studies on curing characteristics of natural rubber-, nitrile rubber-, and silicone rubber-based filled compounds in the presence of boron compounds (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 221 (1994), S. 11-31 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Der Einfluß von vier verschiedenen Borverbindungen (Borcarbid, Bornitrid, Boroxid und Dinatriumtetraborat-Decahydrat) auf die Härtungseigenschaften von mit Ruß und/oder Siliziumdioxid gefüllten Naturkautschuk-, Nitrilkautschuk- und Silikonkautschuk-Compounds wurde untersucht. Rheograph-Messungen wurden mit Hilfe des Modells von Coran interpretiert. Die Kinetischen Parameter belegen den Einfluß der Borverbindungen in den verschiedenen Stadien der Härtung. Die Vernetzungsdichte wurde aus Quellungsmessungen ermittelt und mit den entsprechenden Parametern verglichen.
    Notizen: The influence of four different boron compounds (boron carbide, boron nitride, boron oxide and disodium tetraborate decahydrate) on the curing characteristics of carbon black- and silica-filled conventional natural rubber-, nitrile rubber-, and silicone rubber-compounds has been studied. The curing parameters have illustrated the individual action. Rheographs have been analysed through the application of CoraN's model. The kinetic parameters have revealed the effects of the boron compounds on different stages of cure. The crosslink density has been assessed from swelling for comparison with the related parameters.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1994.052210102
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  • 9
    Digitale Medien
    Digitale Medien
    Studies on binary and ternary blends of polypropylene with ABS and LDPE. II. Impact and tensile properties (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 515-530 
    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: Studies on impact and tensile properties of binary blend of PP and ABS and ternary blend of PP, ABS, and LDPE are presented. Variation of impact strength and the fracture surface morphology with blend composition is examined and interpreted. Tensile behavior in the yield region is studied and the trends of variation of work of yield and impact strength are compared to ascertain the predominent mechanism of impact toughening in these binary and ternary blends. An analysis of yield-stress data in terms of theoretical models is presented to reveal the differences in these binary and ternary blends, attributable to the role of LDPE component in the ternary blend.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1990.070390303
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  • 10
    Digitale Medien
    Digitale Medien
    Determination of the composition of common linear low density polyethylene copolymers by 13C-NMR spectroscopy (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 399-408 
    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: A comprehensive 13C-NMR method for the analysis of composition in the most common commercial polyethylene copolymers has been established. The method covers ethene copolymers with propene, butene-1, hexene-1, octene-1, and 4-methyl pentene-1 in the composition range of 1-10 mol %. The chemical shift assignments and T1 values of the resonances of the copolymers are presented. Results of precision studies and interlaboratory analyses showed that the molar composition could be determined with a relative precision at 2δ of about 6%. This method is being proposed to ASTM as Method X70-8605-2.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070420212
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