Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 107 (1976), S. 143-160 
    ISSN: 1432-072X
    Keywords: New nucleoside-peptide antibiotic ; Chitin biosynthesis ; Structure elucidation ; Mass spectrometry ; Streptomyces tendae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Der Streptomycet Tü 901, Streptomyces tendae, bildet ein antifungisch wirkendes Nukleosid-Antibioticum, Nikkomycin. Als Angriffsort kommt die Chitinsynthese in Frage. Mit Hilfe der Massenspektrometrie und des chemischen Abbaus konnten Uracil, eine Aminohexuronsäure und eine neue, einen Pyridinring enthaltende Aminosäure nachgewiesen werden.
    Notes: Abstract From the fermentation broth of Streptomyces tendae Tü 901 a substance was isolated, which inhibits the growth of several fungi. The new antibiotic affects the chitchin biosynthesis. Its structure was identified by mass spectrometry of the products obtained after chemical degradation. Nikkomycin is a nucleoside-peptide antibiotic consisting of uracil, an amino hexuronic acid and a new amino acid containing a pyridin ring.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 107 (1976), S. 249-256 
    ISSN: 1432-072X
    Keywords: Antibiotic derivatisation ; Yeast antibiotic ; Tryptanthrin ; Tryptophan metabolism ; Candia lipolytica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Candida lipolytica synthetisiert das Antibioticum Tryptanthrin aus 1 Mol Tryptophan und 1 Mol Anthranilsäure. Bei Verfütterung von Tryptophan und substituierter Anthranilsäure, bzw. substituiertem Tryptophan und Anthranilsäure, konnten die zu erwartenden Tryptanthrinderivate isoliert und identifiziert werden. Die Enzyme der Tryptanthrinbiosynthese wiesen in bezug auf diese Substrate, mit Ausnahme von Bromtryptophan, keine Spezifität auf. Parallel zu diesen Versuchen wurden durch chemische Synthese substituierte Tryptanthrine hergestellt. Die Dierivate wurden auf ihre antibiotische Wirksamkeit geprüft; als besonders wirksam erwiesen sich die halogenierten Verbindungen.
    Notes: Abstract Candida lipolytica synthesizes the antibiotic tryptanthrin from 1 mole tryptophan and 1 mole anthranilic acid. When feeding tryptophan and substituted anthranilic acids, or substituted tryptophans and anthranilic acid, we could isolate and identify the expected derivatives of tryptanthrin. The enzymes of the biosynthesis of tryptanthrin, with the exception of bromotryptophan, had no specifity for these substrates. In addition to these experiments substituted tryptanthrines were chemically synthesized. We checked them for antibiotic action; the halogen compounds turned out to be especially effective.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 9 (1976), S. 331-332 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Trennung enantiomerer Aminosäurederivate an chiralen stationären Phasen wird bisher weitgehend auf die Ausbildung unterschiedlich stabiler Wasserstoffbrücken-Assoziate zwischen stationärer Phase und den darin gelösten Enantiomeren zurückgeführt. Die Trennung von D- und L-Aminosäuren an einer stationären Phase, die keine Wasserstoffbrückenbindung zwischen den beteiligten Partnern zuläßt, beweist, daß andere Wechselwirkungskräfte als Wasserstoffbrückenbindungen für die Enantiomerentrennung verantwortlich zu machen sind.
    Notes: Summary The separation of enantiomeric amino acid derivatives on chiral stationary phases is believed to be predominantly due to the formation of hydrogen bond complexes between the stationary phase and the, enantiomeric solutes. The separation of D-and L-amino acids on a stationary phase which does not allow the formation of hydrogen bonds between solvent and solutes indicates that interactions other than hydrogen bonding are responsible for enantiomeric separations.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1976), S. 241-244 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction products of trifluoroacetic anhydride with peptide amides are identified as stable heterocyclic imidazolin-5(4)-ones, which can be analysed by gas chromatography mass spectrometry. The mass spectra show intense molecular ions and allow the assignment of the amino acid sequence.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Chromatographia 9 (1976), S. 72-73 
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine quantitative Analyse des Razemisierungsgrades von Aminosäuren durch gas-chromatographische Trennung der diastereomeren Aminosäureester an nicht-chiralen stationären Phasen ist ungenau, wenn optisch unreine Reagentien zur Herstellung der Derivate Verwendung finden. Dieses Problem kann durch den Einsatz chiraler stationärer Phasen, an denen alle optischen Isomeren getrennt werden, überwunden werden.
    Notes: Summary A quantitative analysis of racemic amino acids by gas chromatographic separation of diastereoisomeric esters on non-chiral stationary phases is inaccurate when optically impure reagents are used for the formation of derivatives. This problem can be solved by using a chiral stationary phase, on which all optical isomers are separated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...