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  • Articles  (29)
  • Chemistry  (29)
  • Biochemistry and Biotechnology  (11)
  • Polymer and Materials Science  (6)
  • ASTROPHYSICS
  • Astrophysics
  • 1990-1994  (29)
  • 11
    Electronic Resource
    Electronic Resource
    Improved fire safety of composites for naval applications (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 16 (1992), S. 119-125 
    Details
    ISSN: 0308-0501
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study is based on the use of integral, hybrid thermal barrier to protect the core of the composite structure. Thermal barrier treatments evaluated in this study include ceramic fabric, ceramic coating, intumescent coating, hybrid of ceramic and intumescent coating, silicone foam, and phenolic skin. The composite systems evaluated in combination with thermal barrier treatments included glass/vinyl ester, graphite/epoxy, graphite/bismaleimide, and graphite/phenolic. All configurations were tested for flammability characteristics. These included smoke density and combustion gas generation (ASTM E-662), residual flexural strength (ASTM D-790), heat release rate, and ignitability (ASTM E-1354). ASTM E-662 test method covers the determination of specific optical density of smoke generated by solid materials. ASTM D-790 test method covers the determination of flexural properties of composite materials in the form of rectangular bars. ASTM E-1354 (cone calorimeter) covers the measurement of the response of materials exposed to controlled levels of radiant heating with or without an external ignitor, and is used to determine the ignitability, heat release rates, mass loss rates, effective heat of combustion, and visible smoke development. Without any fire barrier treatments, all composite systems evaluated in this study failed to meet ignitability and peak heat release requirements of MIL-STD-2031 (SH) at radiant heat fluxes of 75 and 100 kW m-2, respectively. Intumescent coating and a hybrid system consisting of intumescent coating over ceramic coating were the most effective fire barrier treatments for composite systems evaluated in this study. Using either of these treatments, all composite systems met the ignitability requirements of 90 and 60 at 75 and 100 kW m-2, respectively. Except for glass/vinyl ester, all systems also met the peak and average heat release requirements of MIL-STD-2031 (SH) at radiant heat fluxes of 25, 75, and 100 kW m-2, respectively.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fam.810160303
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  • 12
    Electronic Resource
    Electronic Resource
    TiIV-Komplexe mit Brücken-Ylidliganden: Verbindungen mit zwei oxophilen Zentren und Reaktionen mit Aldehyden (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 105 (1993), S. 603-605 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    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/ange.19931050424
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  • 13
    Electronic Resource
    Electronic Resource
    Structures of zearalenone and zearalanone in solution: A high-field NMR and molecular modelling study (1990)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 835-845 
    Details
    ISSN: 0749-1581
    Keywords: Zearalenone ; Zearalanone ; 1H and 13C NMR ; Molecular modelling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete 1H and 13C NMR spectra of the mycotoxin zearalenone are described. An analysis of all the vicinal proton-proton coupling constants, together with molecular modelling results, leads to a three-dimensional structure very similar to those observed x-ray crystallographically for related systems. Analogous data on zearalanone reveal that whereas the overall molecular geometry is similar to that of zearalenone, the alkyl terminus of the 12-membered bridging moiety is now oriented almost orthogonally to the aromatic ring plane.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260281002
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  • 14
    Electronic Resource
    Electronic Resource
    NMR analysis of fluorinated corticosteroids related to fluocinonide: Detection of long-range 1H-19F couplings using the heteronuclear equivalent of the COSY experiment (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 387-397 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 19F Corticosteroids ; 1H-19F long-range coupling ; Heteronuclear COSY ; 1H-19F 2D correlation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analysis of the 1H and 19F NMR spectra of the corticosteroid fluocinonide and five related steroids is reported. The 500 MHz 1H NMR spectra revealed several previously undetected long-range 1H-19F coupling constants. These couplings were assigned by the application of the heteronuclear equivalent of the COSY pulse sequence. The fluorine substituent effects and long-range heteronuclear couplings were examined in relation to structures derived from molecular mechanics (MMX) calculations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290417
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  • 15
    Electronic Resource
    Electronic Resource
    Lipidic peptides, I. Synthesis, resolution and structural elucidation of lipidic amino acids and their homo- and hetero-oligomers (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1175-1183 
    Details
    ISSN: 0170-2041
    Keywords: Amino acids, fatty ; Peptides, lipidic ; Drug delivery ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The α-amino acids with long alkyl side chains, the so-called lipidic amino acids 1a-e, and their homo-oligomers, the lipidic peptides 1p-aj, represent a class of compounds which combine the structural properties of peptides and proteins with the characteristics of lipids and membranes. The amino acids were synthesised from the appropriate alkyl bromide and diethyl acetamidomalonate. Resolution was made chemically, by forming diastereomers of the amino acid esters with an optically pure α-pinene derivative. The protected homooligomers were synthesised in solution with the assistance of a water-soluble carbodiimide coupling agent. In order to modify the physical and chemical properties of the peptides, a series of protected hetero-oligomers were prepared, by similar methods, incorporating either other amino acids (3a - d, 7a - i) or side-chain-substituted lipidic amino acids (6a-d).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001215
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  • 16
    Electronic Resource
    Electronic Resource
    Evaluation of secondary lubricants for rigid PVC extrusion (1991)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 13 (1991), S. 148-150 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A common system of primary lubricants in rigid PVC extrusion compounds is calcium stearate plus paraffin wax. Secondary lubricants are frequently added to this system at low concentrations with the intention of improving such properties as metal release, thermal stability, plateout, extrudate surface appearance, etc. This paper discusses the results of laboratory studies designed to evaluate the contribution to these properties of two commonly used secondary lubricants: AC629A, an oxidized low molecular weight polyethylene, and K175, an acrylic “lubricating processing aid.” Surprisingly, the testing showed little improvement in performance when these auxiliary lubricants were added.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730130308
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  • 17
    Electronic Resource
    Electronic Resource
    Synthesis and Oral Uptake Studies of Lipidic and Glyco-Lipidic Conjugates of β-Lactam Antibiotics (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 685-688 
    Details
    ISSN: 0170-2041
    Keywords: Amino acids, lipidic ; Antibiotics ; Drug delivery ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lipidic and glyco-lipidic cephalosporin conjugates 1c and 1i were synthesised as diastereomeric mixtures to improve their oral absorption. 2-(tert-Butoxycarbonylamino)tetradecanoic acid was condensed with thiazole 1d and by following basecatalysed hydrolysis of the fully protected rac-1e, the free acid rac-1f was produced. This was then used to acylate the carboxy-protected cephalosporin analog 1g by using a modified Vilsmeier reaction. Removal of the protecting groups of 1b resulted in conjugate 1c. Cephalosporin conjugate li, which contains a sugar moiety in addition to a lipidic amino acid residue, was synthesised to produce a drug conjugate with both lipophilic and hydrophilic properties [radiolabelled (14C) analogs 1a, 1c and 1i were also synthesised]. The radio-labelled parent 1a and conjugates 1c and 1i were administered orally to rats and uptake of the radiolabel in the blood, various organs, urine and faeces was determined. The results showed that an increase in lipophilicity caused an increase in the oral uptake, suggesting that conjugation to lipidic amino acids and peptides is a useful approach to the improvement of the absorption of poorly absorbed drugs.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940709
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  • 18
    Electronic Resource
    Electronic Resource
    The use of charge-coupled devices in the quantitative evaluation of images, on photographic film or membranes, obtained following electrophoretic separation of DNA fragments (1990)
    Weinheim : Wiley-Blackwell
    Electrophoresis 11 (1990), S. 432-440 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Charge-coupled devices can provide an excellent means for the quantification of DNA band images on membranes and photographic film. However, proper consideration must be given to important parameters such as signal-to-noise ratio and resolution, especially in applications which demand the use of large format media. When employed in the direct imaging of chemiluminescent blots, the charge-coupled device can provide equal or better sensitivity than that obtained by indirect methods using film, with the additional advantages of wide dynamic range and freedom from the vagaries of film processing.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150110514
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  • 19
    Electronic Resource
    Electronic Resource
    Improving the detection of proteins after transfer to polyvinylidene difluoride membranes (1992)
    Weinheim : Wiley-Blackwell
    Electrophoresis 13 (1992), S. 715-717 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: N-Terminal sequence analysis of proteins separated by two-dimensional polyacrylamide gel electrophoresis and transferred onto polyvinylidene difluoride (PVDF) membranes has become the method for molecular characterization of proteins contained in biological samples. However, the proteins of lower abundance cannot be sequenced directly, without improving the technique. We have studied a drying method on several PVDF membranes including Trans-Blott, Immobilon P and Problott. Using Amido Black, Coomassie Brilliant Blue R-250 and Ponceau S, we have obtained, in comparison with the non-dried membranes, an enormous increase in the number of detectable proteins.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501301151
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  • 20
    Electronic Resource
    Electronic Resource
    Human liver protein map: A reference database established by microsequencing and gel comparison (1992)
    Weinheim : Wiley-Blackwell
    Electrophoresis 13 (1992), S. 992-1001 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: This publication establishes a reference human liver protein map obtained with immobilized pH gradients. By microsequencing, 57 spots or 42 polypeptide chains were identified. By protein map comparison and matching (liver, red blood cell and plasma sample maps), 8 additional proteins were identified. The new polypeptides and previously known proteins are listed in a table and/or labeled on the protein map, thus providing a human liver two-dimensional gel database. This reference map can be used to identify protein spots on other samples such as rectal cancer biopsies.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501301201
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