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  • Chemistry  (20)
  • Male  (8)
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  • Biochemistry and Biotechnology  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Photochemical reactions VII [1].Communicated in part at the XVII Reunión Bienal de la Real Sociedad Española de Física y Química, 27 October-2 November, 1975, Alicante (Spain). Part of the doctoral thesis of J. Gómez, I.Q.S., Barcelona, 1977. A ‘type A rearrangement’ in the photolysis of a steroidal α, β-unsaturated lactone (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 1357-1360 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The irradiation of 17 β-hydroxy-2-oxa-androst-4-en-3-one (1) yield a cyclopropane derivative 2, which is the result of a rearrangement, formally analogous to the ‘type A rearrangement’ of the enones. Two other products, the dihydroxy compound 5 and the dimer 6, have also been isolated (Scheme 1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600423
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  • 2
    Electronic Resource
    Electronic Resource
    Characteristics of tyrosinase in AOT-isooctane reverse micelles (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 34 (1989), S. 304-308 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Isooctane-AOT-H2O is a suitable system for studying enzyme behavior in organic solvents. Tyrosinase was able to catalyze a well-known reaction in aqueous medium: oxidation of 4-methylcatechol to yield 4-methyl-o-benzoquinone. This reaction was studied using the preceding ternary system with adequate amounts of each component to make up reverse micelles. 4-Methyl-o-benzoquinone stability was demonstrated in isooctane even at alkaline pH values. Apparent Km and Vmax were similar to those in water, but substrate inhibition was more evident. The pH and temperature appear to be shifted toward high and low values, respectively. Characteristic parameters of reverse micelles, ω0 (= H2O/AOT) and percentage of H2O (v/v), were investigated. The results obtained showed that the steady-state rate varies either with ω0 or with percentage of H2O. The variation observed with ω0 showed an optimal value while an increase in percentage of H2O can lead to decreased or increased activity depending on substrate concentration.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260340305
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of data consistency and estimation of yield parameters in hydrocarbon fermentations (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 21 (1979), S. 2203-2233 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The consistency of experimental data for hydrocarbon fermentations is reviewed using carbon and available electron balances and the mean values of the regularities for carbon weight fraction in biomass and biomass reductance degree. True growth yields and maintenance coefficients are estimated from both batch and continuousculture data and the results are compared.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260211205
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  • 4
    Electronic Resource
    Electronic Resource
    Data consistency, yield, maintenance, and hysteresis in batch cultures of Candida lipolytica cultured on n-hexadecane (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 22 (1980), S. 421-450 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Candida lipolytica was cultured batchwise using n-hexadecane as the main carbon source. Biomass production, n-hexadecane consumption, oxygen consumption, and carbon dioxide evolution were measured to follow the fermentation. The consistency of the measured data was examined using integrated and instantaneous available electron and carbon balances. Values of the “true” growth yield, ηmax, and maintenance coefficient, me were estimated using three different sets of data (biomass and n-hexadecane, oxygen and biomass, and CO2 and biomass), and the results were compared with estimates obtained from literature data. Hysteresis patterns were observed in plots of specific rates of oxygen consumption and carbon dioxide evolution versus specific growth rate.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260220214
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of 5,8-dimethoxy-2(1H)-quinolinones by intramolecular Wittig reaction (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1895-1899 
    Details
    ISSN: 0947-3440
    Keywords: Wittig reaction ; 2(1H)-Quinolinones ; ortho-Directed metalation of anilides ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title compounds 12, which are key intermediates for antitumoral diazaquinomycin A analogues, are obtained by intramolecular Wittig reaction of 1-[3′,6′-dimethoxy-2′-(α-oxoacylamino)phenyl]alkyltriphenylphosphonium salts 11, which are prepared via lithiation of 2′,5′-dimethoxy-N-pivaloylaniline 6. The applicability of this route to polysubstituted 2(1H)-quinolinones 12 and 17 is examined.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1995199510266
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  • 6
    Electronic Resource
    Electronic Resource
    Different Reactivity Patterns in Dinuclear Pyrazolate-Bridged Complexes: Stereoselective Formation of Ketonic Carbonyls (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 159-163 
    Details
    ISSN: 1434-1948
    Keywords: Pyrazolato complexes ; Dinuclear complexes ; Ketonic carbonyls ; Ruthenium ; Osmium ; Rhodium ; Iridium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The metal-metal bonded dicarbonyl compounds [(η6-p-cymene)M(μ-pz)2IrCl(CO)2](M-Ir) react stereospecifically with PPh3 to yield an enantiomeric pair of ketonic carbonyl compounds [(η6-p-cymene)M(μ-CO)(μ-pz)2IrCl(CO)(PPh3)] [M = Ru (1), Os (2)] in which the chloride ligand is trans to the bridging ketone group. However, the non metal-metal bonded isomers [(η6-p-cymene)MCl(μ-pz)2M′(CO)2], under similar conditions, eliminate CO forming the monosubstitution products [(η6-p-cymene)MCl(μ-pz)2M′(CO)(PPh3)] [M = Ru; M′ = Ir (3), Rh (4). M = Os; M′ = Rh (5)]. Removal of the chloride ligand in 1 affords [RuIr(η6-p-cymene)(CO)2(PPh3)(pz)2]BPh4 as two isomers, 6a,b. The related OsIr compound [(η6-p-cymene)Os(μ-CO)(μ-pz)2Ir(CO)(PPh3)]BPh4 (9) has been prepared from [(η6-p-cymene)Os(CO)(μ-pz)2Ir(CO)2]BPh4 (7) and PPh3. Again, the OsRh tricarbonyl related to 7 [(η6-p-cymene)Os(CO)(μ-pz)2Rh(CO)2]BPh4 (8) reacts differently with PPh3 affording [(η6-p-cymene)Os(CO)(μ-pz)2Rh(CO)(PPh3)]BPh4 (10).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of aliphatic aldehydes on the lipid peroxidation and chemiluminescence of biological systems under oxidative stress (1997)
    New York : Wiley-Blackwell
    Journal of Bioluminescence and Chemiluminescence 12 (1997), S. 141-148 
    Details
    ISSN: 0884-3996
    Keywords: lipid peroxidation ; aldehydes ; chemiluminescence ; oxidative stress ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The effect of several aliphatic aldehydes on lipid peroxidation was evaluated by measuring the oxygen uptake rate, thiobarbituric acid-reactive products formation and the emitted visible chemiluminescence intensity. Measurements were carried out in brain homogenates and erythrocyte plasma membrane and liver microsomal fractions. In all systems studied, aldehydes (25 mmol/L) (e.g. acetaldehyde, 2,2-dimethylpropanal), increased the intensity of the luminescence associated with the oxidation process. In contrast, aldehyde incorporation decreased TBARS production and the rate of oxygen uptake. The increased luminescence intensity is explained in terms of secondary reactions of aldehyde derived free radicals. These results clearly indicate that extreme care must be exercized in the intepretation of chemiluminescence data in the presence of aldehydes. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Yeast cell permeabilizing β-1,3-Glucanases: A tool for the integration of downstream processes and metabolic engineering applications to yeast (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 58 (1998), S. 321-324 
    Details
    ISSN: 0006-3592
    Keywords: yeast cell wall porosity and permeability ; β-1,3-glucanase ; selective protein release ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In this article, we consider the impact on downstream process design resulting from the use of metabolically engineered yeast strains. We address the issue of how manipulation of cell wall permeability can improve the release and subsequent recovery of heterologous products produced in yeast. © 1998 John Wiley & Sons, Inc. Biotechnol Bioeng 58:321-324, 1998.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Two-dimensional mass spectra of 2-phenylethylamines (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1255-1259 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The two-dimensional mass spectra (metastable mapping) of ten biogenic amines derived from the amino acid 2-phenylalanine are described. This technique permitted the identification of almost all the fragmentations of singly and doubly charged positive ions formed by electron impact and decomposing in the different parts of a reverse-geometry mass spectrometer. The results obtained are discussed in order to establish the main fragmentation pathways common to all the amines belonging to the general class of 2-phenylethylamines and to identify the fragmentations characteristic of each amine.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300907
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  • 10
    Electronic Resource
    Electronic Resource
    The Release of Singlet Oxygen in the Reaction of Dioxiranes with Amine N-Oxides (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2527-2532 
    Details
    ISSN: 1434-193X
    Keywords: Amines ; Amine N-oxides ; Singlet oxygen ; Dioxiranes ; Deoxygenation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactivity of dimethyldioxirane and methyl(trifluoromethyl)dioxirane towards the amine N-oxides 1a-13a and ammonium derivatives 13b-d has been investigated. In the dioxirane oxidation of the tertiary amines and nitrogen heteroarenes, the expected N-oxides are not always formed. Instead, the in situ generated N-oxides are deoxygenated by the dioxirane with the release of singlet oxygen (1O2) at comparable or even higher rates than the amine oxidation. The amount of 1O2 has been quantified by IR chemiluminescence and by chemical trapping with 9,10-dimethylanthracene. The nucleophilicity of the N-oxide determines the efficacy of the 1O2 release in the deoxygenation. Thus, for the less nucleophilic heteroaromatic N-oxides, the deoxygenation of the amine oxide competes ineffectively with the oxidation of the amine. The ammonium derivatives 13b-d do not promote the decomposition of the dioxiranes; as expected, they are epoxidized.
    Additional Material: 2 Tab.
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