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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of chiroptical properties of molecules by asymmetric photochemistry (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 3 (1991), S. 257-262 
    Details
    ISSN: 0899-0042
    Keywords: chiral photochemistry ; excitation transfer ; optical activation ; circular dichroism ; dissymmetry factor ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The physics involved in photochemistry with circularly polarized light, the warnings on its inherent limitations, as well as some examples of application on organic molecules are briefly reviewed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530030408
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  • 2
    Electronic Resource
    Electronic Resource
    Factors affecting the fast atom bombardment mass spectrometric analysis of proteolytic digests of proteins (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1992), S. 22-26 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fast atom bombardment (FAB) mass spectrometric analysis of proteolytic digests of proteins is currently used in protein structural characterization. The major current limitation of this procedure is that not all the peptides generated by enzyme digestion can be observed in the spectra. Previous studies showed that in a mixture the more hydrophilic peptides are suppressed. Several enzymatic digests of 18 different proteins ranging from 10 kDa to 67 kDa in molecular weight were examined using FAB mass spectrometry. It was observed that, even though the hydrophobicity of peptides is a factor in determining their presence or absence in the spectra, the predictions of whether or not a peptide would be detected based on this criterion varies in a wide range of values. Moreover, present results seem to indicate that the presence of particular amino acid side chains within a peptide sequence capable of forming hydrogen bonds with the matrix heavily affects the behaviour of that peptide in the mixture, despite the overall hydrophobicity of the peptide itself.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200210106
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  • 3
    Electronic Resource
    Electronic Resource
    Fast atom bombardment mass spectrometric analysis of haemoglobin variants: Use of V-8 protease in the identification of Hb M Hyde Park and Hb San Jose (1990)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1990), S. 568-572 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The characterization of two human haemoglobin variants, Hb M Hyde Park and Hb San José, by fast atom bombardment mass spectrometry is reported. The identification of the site and nature of the amino acid substitution was performed by analysis of the peptide mixture generated by proteolytic digestion of the variant β-globin chains with V-8 protease. The use of this protease was instrumental in the unambiguous identification of the replaced residues because the tryptic map alone was unable to unequivocally locate the modification. Spectra obtained were easily interpreted and the characterization of Hb M Hyde Park (β, 92 Hys → Tyr) and Hb San José (β 7 Glu → Gly) was accomplished essentially by the same procedure already described for the tryptic map. These results are suggestive of alternative approaches in haemoglobin variants characterization using different proteolytic enzymes when tryptic data alone do not lead to unambiguous results.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200190908
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  • 4
    Electronic Resource
    Electronic Resource
    Automated synthesis of distillation sequences using fuzzy logic and simulation (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 1341-1348 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: An automated distillation sequencing system (DSEQSYS) is presented, which consists of three components: a control program, a fuzzy heuristic synthesis program, and a process simulator. DSEQSYS, when applied to problems previously reported in the literature, overcomes some of the disadvantages of using heuristics or mathematical programming alone. DSEQSYS can address problems involving nonsharp separations, nonideal chemical behavior, and conflicting heuristics. A simple approach for converting the traditional separation heuristics into corresponding fuzzy heuristics is also demonstrated.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400807
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  • 5
    Electronic Resource
    Electronic Resource
    Sulfur-Containing polymers. New polythiocarbonates and polydithiocarbonate based on 4,4′-isopropylidenedibenzenethiol (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 2453-2461 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: New sulfur-containing polycarbonates have been prepared by interfacial polycondensation of 4,4′-isopropylidenedibenzenethiol with phosgene, bisphenol-A bischloroformate and bisphenol-A polycarbonate oligomers (—OH/—O—CO—Cl terminated); high-molecular-weight polymers were obtained. The influence of the nature of the phase transfer catalyst on the yield and on the molecular weight of the polymers was studied. From thermogravimetry (TG) analysis it was possible to observe that the substitution of the oxygen atoms by sulfur atoms leads to less thermally stable polymers compared with the corresponding polycarbonate (bisphenol-A polycarbonate).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940904
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal degradation of polybutadiene, 2Part 1: cf. ref.8. Overall thermal behaviour of polymers with different microstructures (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 113-121 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The thermal decomposition at volatilization temperatures of polybutadiene samples with different initial microstructures was investigated i. vac. and under nitrogen atmosphere by thermogravimetry, differential scanning calorimetry, thermal volatilization analysis and infrared spectroscopy. The decomposition of cis-1,4-, trans-1,4- and random polybutadienes occurs in two stages, whereas only one stage is shown by 1,2-polybutadiene. Chemical changes and amounts of weight loss in the first degradation stage are dependent on the sample heating rates. The volatile degradation products were collected, fractionated and compared for the different polymers.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930111
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  • 7
    Electronic Resource
    Electronic Resource
    Dimensions of poly(methyl methacrylate) molecules in poor solvents (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 2333-2344 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dilute solutions of narrow distribution poly(methyl methacrylate) (PMMA) samples in the poor solvents, 2-ethoxyethanol and acetonitrile, are studied by dynamic and static light scattering and viscometry. Theta temperatures at 37,8°C and 32,3°C, respectively, are found, where the constants KΘ of the Mark-Houwink-Sakurada relation are 5,6 · 10-2 cm3/g and 4,0 · 10-2 cm3/g. This implies that the unperturbed dimensions of PMMA molecules in 2-ethoxyethanol are greater by 12% than in acetonitrile. The hydrodynamic radii in the two solvents and the radii of gyration in acetonitrile are found to decrease smoothly with decreasing temperature passing the theta temperatures. Data treatment according to the thermal blob model shows that the macromolecular coils, still close to Gaussian statistics, move toward the excluded volume regime above the theta temperature Θ and toward the collapse regime below Θ.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021921012
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  • 8
    Electronic Resource
    Electronic Resource
    On the Absolute Configuration of Penlanfuran and Related Sesquiterpenoids of the Sponge Dysidea fragilis from the North-Brittany Sea (1990)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 73 (1990), S. 652-658 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 1,4-addition of vinylmagnesium bromide/CuBr-SMe2 to (+)-(4s)-cryptone ((+)-6) in THF in the presence of Me3SiCI gives the silylenol ether 7 which partly undergoes hydrolysis to ketone 8 on aqueous workup; residual 7 is hydrolyzed with pyridinium p-toluenesulfonate (PyTsOH) to give 8 which is protected in situ with ethylene glycol and then ozonolized to give aldehyde (—)-10. The latter, on addition of 3-lithiofuran followed by dehydration and deprotection with Py TsOH, gives the unnatural (4S)-enantiomer (+)-2 of noroxopenlanfuran. All processes, except 11 → (+)-2, are of good yield. On the basis of previous chemical transformations, this also establishes the (4R)-configuration for penlanfuran ((-)-1) and other sesquiterpenoids of the sponge Dysidea fragilis from the North-Brittany sea. Non viable routes to (±)-noroxoperlanfuran ((±)-2) are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19900730314
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  • 9
    Electronic Resource
    Electronic Resource
    CeCl3-vermittelte Addition von Grignard-Verbindungen an 1,3-DiketoneDiese Arbeit wurde vom MURST (Ministero dell' università e della ricerca scientifica e tecnologica) gefördert. (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 105 (1993), S. 1115-1116 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19931050731
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  • 10
    Electronic Resource
    Electronic Resource
    Editorial (1990)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 10 (1990), S. iii 
    Details
    ISSN: 0730-6679
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adv.1990.060100201
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