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  • 1
    Electronic Resource
    Electronic Resource
    Production L-tryptophan by Escherichia coli cells (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 999-1011 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Whole cells of Escherichia coli B 10 having high tryptophan synthetase activity were used directly as an enzyme source to produce L-tryptophan from indole and L- or D,L-serine. This strain is tryptophan auxotrophic, which is tryptophanase negative and, in addition, L- and D-serine deaminase negative under production conditions. To avoid inhibition of tryptophan synthetase by a high concentration of indole, nonaqueous organic solvents, Amberlite XAD-2 adsorbent, and nonionic detergents were used as reservoirs of indole in the reaction mixture for the production of L-tryptophan. As a result, different effects were observed on the production of L-tryptophan. Particularly, among the nonionic detergents, Triton X-100 was very efficient. Using Triton X-100 for production of L-tryptophan from indole and L- or D,L-serine by whole cells of Escherichia coli B 10, 14.14 g/100 mL and 14.2 g/100 mL of L-tryptophan were produced at 37°C for 60 h.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250410
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  • 2
    Electronic Resource
    Electronic Resource
    Continuous production of L-tryptophan from indole and L-serine by immobilized Escherichia coli cells (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 25 (1983), S. 1013-1025 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Escherichia coli B 10, which has high activity of tryptophan synthetase, was grown in a 50-L batch culture in order to determine in which growth phase the cells have the highest specific tryptophan productivity. Accordingly, whole cells of the stationary phase were used for immobilization in polyacrylamide beads. After immobilization, these immobilized cells had 56% activity of tryptophan synthetase compared with that of free cells. First, the properties of immobilized cells were investigated. Next, discontinuous productions of L-tryptophan were carried out by using immobilized cells. In discontinuous production of L-tryptophan by the batch, the activity remaining of immobilized cells was 76-79% after 30 times batchwise use. In continuous production of L-tryptophan with a continuous stirred tank reactor (CSTR), the activity remaining of the immobilized cells was 80% after continuous use for 50 days. The maximum productivity of L-tryptophan in this CSTR system was 0.12 g tryptophan L-1 h-1.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260250411
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  • 3
    Electronic Resource
    Electronic Resource
    Photochemische Reaktionen, VIII. Photodecarbonylierung von N-Phenyl-oxindol (1969)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 102 (1969), S. 3486-3494 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Photolyse von N-Phenyl-oxindol (3) entsteht unter Abspaltung von Kohlenoxid in hoher Ausbeute die Spiroverbindung 5. Dasselbe Produkt bildet sich bei der Bestrahlung von N-Phenyl-benzazetin (2). Die Struktur von 5 wird durch die spektroskopischen Daten und durch chemische Reaktionen bewiesen. Das bei der Photodecarbonylierung von 3 intermediär auftretende Anil 4 läßt sich als Diels-Alder-Addukt 16 mit N-Phenyl-maleinimid abfangen. Die Belichtung des methylierten Phenyloxindols 11 führt zu dem zu 5 analogen Produkt 12.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19691021027
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  • 4
    Electronic Resource
    Electronic Resource
    Zur mikrobiologischen Hydroxylierung von 14α-H-Cardenoliden (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3304-3317 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Microbial Hydroxylation of Some 14α-H-Cardenolides1 is chemically transformed to compounds 2, 5b, 8b, 11, and 14b by well known methods. These are the educts for microbial hydroxylation by Curvularia lunata, Cunninghamella blakesleena, and Aspergillus ochraceus. Generally α-attack on the steroids is observed only, by preference of the C-11-, C-17- and C-14-positions.
    Notes: Mit bekannten Methoden der Steroidchemie wird 1 in die Verbindungen 2, 5b, 8b, 11 und 14b übergeführt. Diese dienen als Substrate für die mikrobiologische Hydroxylierung mit Curvularia lunata, Cunninghamella blakesleeana und Aspergillus ochraceus. Allgemein wird dabei lediglich ein Angriff auf die α-Seite der Steroide beobachtet, vorzugsweise in den Positionen C-11, C-17 und C-14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761091005
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  • 5
    Electronic Resource
    Electronic Resource
    Gold-Komplexe von Diphosphinomethanen, I. Synthese und Kristallstruktur zweikerniger Gold(I)-Verbindungen (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 1748-1754 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Complexes of Diphosphinomethanes, I. Synthesis and Crystal Structure of Binuclear Gold(I) CompoundsBis(diphenylphosphino)methane forms 1:2 complexes of AuCl, Aul, and AuCH3 (1a-c). From 2,2-bis(diphenylphosphino)propane an analogous AuCl complex could also be obtained (2a). in addition to the usual analytical and spectroscopic characterization, Au-Mößbauer and Au-ESCA spectra have been recorded, and an X-ray analysis of 1a has been carried out. The results are of interest with respect to the short, but nonbonding Au—Au distance.
    Notes: Bis(diphenylphosphino)methan bildet 1:2-Komplexe mit AuCl, Aul und AuCH3 (1a-c). Auch von 2,2-Bis(diphenylphosphino)propan kann ein analoger AuCl-Komplex erhalten werden (2a). Zusätzlich zur üblichen analytischen und spektroskopischen Charakterisierung werden Au-Mößbauer- und Au-ESCA-Spektren aufgenommen und von 1a eine Röntgenstrukturanalyse angefertigt. Die Ergebnisse sind wegen des kurzen, aber nichtbindenden Au—Au-Abstandes von Interesse.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100519
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  • 6
    Electronic Resource
    Electronic Resource
    Gold-Komplexe von Diphosphinomethanen, III. AuII-Verbindungen durch oxidative Addition von Halogen (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2758-2764 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Complexes of Diphosphinomethanes, III. AuII Compounds by Means of Oxidative Addition of HalogenOxidative addition of halogen to the 1:2 complexes of bis(diphenylphosphino)methane and -propane with AuCl (1a, 5) leads to products which are formulated partly as AuI/AuIII compounds (2a, b), but partly also as true AuII derivatives (6a, b). The addition of iodine to the AuI complex yields an adduct of the type 4. For the characterisation of the largely insoluble materials, infrared, Mössbauer, and ESCA spectroscopy have been employed.
    Notes: Durch oxidative Addition von Halogen an 1:2-Komplexe von Bis(diphenylphosphino)methan und -propan mit AuCl (1a, 5) entstehen Produkte, die teilweise als AuI/AuIII-Verbindungen (2a, b), teilweise aber auch als echte AuII-Derivate zu formulieren sind (6a, b). Die Anlagerung von Iod an den AuI-Komplex liefert nur ein Addukt vom Typ 4. Zur Charakterisierung der fast ausnahmslos unlöslichen Substanzen wurden die Infrarot-, Mössbauer-und ESCA-Spektroskopie herangezogen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100811
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  • 7
    Electronic Resource
    Electronic Resource
    Gold-Komplexe von Diphosphinomethanen, IV. AuI-Verbindungen von Diphosphinoaminen und oxidative Addition von Chlor zu AuII- und AuIII-Komplexen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 496-500 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gold Complexes of Diphosphinomethanes, IV. Au1 Compounds of Diphosphinoamines and Oxidative Addition of Chlorine Yielding AuII and AuIII ComplexesBis(diphenylphosphino)amine (DPA) reacts with two equivalents of ClAu(CO) to form a binuclear gold complex HN[P(C6H5)2AuCl]2 (1). The analogous methylamine derivative (2) is prepared more easily from the ligand bis(diphenylphosphino)methylamine (DPMA) and HAuCl4 in ethanol. Excess DPMA. in the same solvent, yields a cyclic 1:1 complex 3 which is electrolytically dissociated in acetonitrile. 2 can be oxidized using stoichiometric amounts of chlorine to form complexes with the formal oxidation states +2 (5) and +3 (6) of gold. l97Au Mößbauer spectra prove that 5 is indeed not a mixed Au1/AuIII compound but contains the structural moiety Au24⊕.  -  DPA can be metallated at the nitrogen with n-C4H9Li and transformed into [(C6H5)2P]2NSI(CH3)3 using (CH3)3SiCi, but no gold complex was obtained from this ligand.
    Notes: Bis(diphenylphosphino)amin (DPA) reagiert mit zwei Äquivalenten ClAu(CO) zum zweikernigen Goldkomplex HN[P(C6H5)2AuCl]2 (1). Das analoge Methylaminderivat (2) kann leichter aus dem Liganden Bis(diphenylphosphino)methylamin (DPMA) und HAuCl4 in Ethanol erhalten werden. Überschüssiges DPMA ergibt im gleichen Solvens den cyclischen 1 : 1-Komplex 3, der in Acetonitril elektrolytisch dissoziiert. 2 kann mit stöchiometrischen Mengen Chlor in Komplexe übergeführt werden, in denen Gold formal die Oxidationsstufen +2 (5) und +3 (6) besitzt. 197Au-Mößbauer-Spektren beweisen, daß 5 tatsächlich keine gemischte AuI/AuIII 1-Verbindung ist, sondern das Strukturelement Au24⊕ enthalten muß.  -  DPA kann mit n-C4H9Li am Stickstoff metalliert und mit (CH3)3SiCl in den Liganden [(C6H5)2P]2NSi(CH3)3 verwandelt werden, von dem jedoch noch kein Goldkomplex zu erhalten war.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120212
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  • 8
    Electronic Resource
    Electronic Resource
    Eignung von Schizophyllan-Lösungen zum Polymerfluten von Erdöl-Lagerstätten mit hoher Temperatur und Salinität (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 576-577 
    Details
    ISSN: 0009-286X
    Keywords: Schizophyllan ; Viskosität ; Filtrationsverhalten ; Temperatur- und Salzstabilität ; tertiäre Erdölförderung ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330640627
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  • 9
    Electronic Resource
    Electronic Resource
    Kontinuierliche mikrobielle Umwandlung von 5-monosubstituierten Hydantoinen in einem Zell-Membran-Reaktor und Abtrennung der Reaktionsprodukte durch Elektrodialyse (1993)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1224-1228 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330651008
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  • 10
    Electronic Resource
    Electronic Resource
    Produktion von Propionsäure und Vitamin B12 aus Zucker oder Abfallmelasse in kontinuierlicher KulturNach einem Vortrag von A. S. Afschar auf der 11. Dechema-Jahrestagung der Biotechnologen, 24. bis 28. Mai 1993 in Nürnberg. (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 345-348 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330660309
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