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  • 1985-1989  (37)
  • 1975-1979  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Glass capillaries for fast gas chromatographic separation of amino acid enantiomers (1975)
    s.l. : American Chemical Society
    Analytical chemistry 47 (1975), S. 951-952 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60356a044
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolic products of microorganisms (1978)
    Springer
    Archives of microbiology 116 (1978), S. 253-257 
    Details
    ISSN: 1432-072X
    Keywords: Antibiotics from Aspergilli ; Cladosporin ; Dimethyl cladosporin ; Asperentin ; Isocoumarins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cladosporin was isolated from the cultures of three species of the genus Eurotium. Cladosporin inhibited the growth of several fungi and at very low concentrations the growth of Bacillus brevis and Clostridium pasteurianum. Bacillus subtilis and most other Gram-positive bacteria were not sensitive. Gram-negative bacteria and yeasts were not affected by concentrations up to 100 μg/ml. Dimethyl cladosporin showed only weak activity against Bacillus brevis with the minimal inhibitory concentrations being a 100 times higher than of cladosporin. The incorporation of leucine and uracil into acid insoluble material in Bacillus brevis cells was completely inhibited by concentration of 0.5 μg/ml cladosporin. The incorporation of thymidine was not affected at this concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417848
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  • 3
    Electronic Resource
    Electronic Resource
    Chemistry of fruit flies. Composition of the rectal gland secretion of (male) Dacus cucumis (cucumber fly) and Dacus halfordiae. Characterization of (Z,Z)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 3893-3902 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00277a028
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  • 4
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen. 253. Mitteilung252, Mitteilung. Hormaomycin, ein neues Peptid-lacton mit morphogener Aktivität auf Streptomyceten (1989)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 72 (1989), S. 426-437 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hormaomycin, a Novel Peptide Lactone with Morphogenetic Activity on StreptomycesA culture identified as Streptomyces griseoflavus (strain W-384) has been found to produce a novel peptide-lactone antibiotic designated hormaomycin (6). The empirical molecular formula of the compound is established to be C55H69ClN10O14. The constituent amino acids of the antibiotic are suggested to be allothreonine (1; 1), isoleucine (2; 1), 3-methyl-phenylalanine (3; 2), and, for the first time identified from a natural source, 4-[(Z)-prop-1-enyl]-proline (4; 1) and 3-(2-nitrocyclopropyl)-alanine (5; 2). The amino acids were delivered by acidic hydrolysis and assigned by high-resolution- GC/MS analysis (after transformation to derivatives) in combination with extended 2D-NMR experiments of the antibiotic itself. From the latter, it became plausible that the N-terminus of the peptide chain is acylated by a Cl-containing derivative of 1H-pyrrol-2-carboxylic acid. Hormaomycin is active against some Gram-positive bacteria. In addition, the antibiotic exhibits potent aerial mycelium-inducing activity and effects the production of antibiotics.
    Notes: No abstract.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19890720303
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen von Aminosäuren und Peptiden, II. Darstellung von 2-Aminooxazolderivaten aus Peptidamiden mit Hexafluoracetanhydrid (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 973-985 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Amino Acids and Peptides, II. - Preparation of 2-Aminooxazole Derivatives from Peptide Amides with Hexafluoroacetic AnhydrideC-Terminal amino acid amide residues of peptide amides react with hexafluoroacetic anhydride to form stable 5-(trifluoroacetylamino)oxazole derivatives. Several representatives of this class of compounds have been synthesized and their structures determined by 1H-NMR and mass spectrometry and by their chemical reactions. The heterocyclization reaction can be used for the formation of volatile derivatives in the analysis of peptide amides on a microgram scale and for the identification of the C-terminal amino acid residue in peptide amides.
    Notes: C-Terminale Aminosäureamidreste von Peptidamiden reagieren mit Hexafluoracetanhydrid in guten Ausbeuten zu stabilen 5-(Trifluoracetylamino)oxazolderivaten. Verschiedene Vertreter dieser Verbindungen wurden dargestellt und ihre Struktur durch 1H-NMR-, Massenspektrometrie und chemische Reaktionen charakterisiert. Die Heterocyclisierungsreaktion kann im Mikrogramm-Maßstab zur Herstellung flüchtiger Derivate bei der Analytik von Peptidamiden und zur Identifizierung der C-terminalen Aminosäure von Peptidamiden benutzt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919790708
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  • 6
    Electronic Resource
    Electronic Resource
    Sequence and Conformation of Suzukacillin A (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1041-1062 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sequenz und Konformation von Suzukacillin ADie Sequenz des spannungsabhängige Membranporen bildenden Polypeptidantibiotikums Suzukacillin A wurde bestimmt durch eine Kombination von trifluoracetolytischer Spaltung, präparativer Isolierung von Fragmenten und Analyse durch Gaschromatographie - Massenspektrometrie sowie Felddesorptions- und Fast-Atom-Bombardment-Massenspektrometrie. Suzukacillin A ist ein mikroheterogenes Eikosapeptidantibiotikum (Ac-Aib-L-Ala-Aib-Ala-Aib-Ala(Aib)-Gln-Aib-Aib(Leu)-Aib-Gly-Leu-Aib-Pro-Val-Aib-Aib(D-Iva)-Gln-Gln-Phl) mit einer Sequenz, einer α-helicalen Konformation (nach13C-NMR- und Circulardichroismus-Messungen) und membranmodifizierenden Eigenschaften, die dem Alamethicin ähnlich sind.
    Notes: The sequence of the potential-dependent membrane pore-forming polypeptide antibiotic suzukacillin A was determined by a combination of trifluoroacetolytic cleavage, preparative isolation of fragments, and analysis by gas chromatography - mass spectrometry, field-desorption and fast-atom bombardment mass spectrometry. Suzukacillin A is a microheterogeneous eicosapeptide antibiotic (Ac-Aib-L-Ala-Aib-Ala-Aib-Ala(Aib)-Gln-Aib-Aib(Leu)-Aib-Gly-Leu-Aib-Pro-Val-Aib-Aib(D-Iva)-Gln-Gln-Phl) with a sequence, an α-helical conformation (according to 13C NMR and circular dichroism), and membrane-modifying properties related to alamethicin.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850518
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese reiner Stereoisomerer der N-terminalen Aminosäure von Nikkomycin B (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 2165-2177 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Pure Stereoisomers of the N-terminal Amino Acid of Nikkomycin BPure stereoisomers of 2-amino-4-hydroxy-4-(p-hydroxyphenyl)-3-methylbutanoic acid (8c), the N-terminal amino acid of nikkomycin B (10a, b), were synthesized by 1,3-dipolar cycloaddition of (ethoxycarbonyl)methanenitrile oxide (2) to the olefines 1, separation of the diastereomeric 4,5-dihydro-3-isoxazolecarboxamides 6, and diastereoselective reductive cleavage and hydrolysis of 6. X-ray structure analysis revealed the absolute configuration (2R,3R,4R) for one pure synthetic stereoisomer of 8c. Gas chromatography on a chiral stationary phase and 1H NMR enabled us to assign the (2S,3S,4S) configuration to the natural amino acid.
    Notes: Reine Stereoisomere von 2-Amino-4-hydroxy-4-(p-hydroxyphenyl)-3-methylbuttersäure (8c), der N-terminalen Aminosäure von Nikkomycin B (10a, b), wurden nach 1,3-dipolarer Cycloaddition von (Ethoxycarbonyl)methannitriloxid (2) an die Olefine 1 und Trennung der diastereomeren 4,5-Dihydro-3-isoxazolcarboxamide 6 durch diastereoselektive reduktive Spaltung und Verseifung von 6 hergestellt. Mit Hilfe eines reinen, synthetischen Stereoisomers von 8c, dessen absolute Konfiguration (2R,3R,4R) durch Kristallstrukturanalyse bestimmt werden konnte, sowie mit Hilfe von Gaschromatographie an chiraler Phase und 1H-NMR gelang es, der natürlichen Aminosäure die Konfiguration (2S,3S,4S) zuzuordnen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519851107
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  • 8
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen, 182. Aufklärung der Struktur des Nucleosidantibiotikums Nikkomycin X (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1494-1502 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metabolites of Microorganisms, 182.  -  Structure Elucidation of the Nucleoside Antibiotic Nikkomycin XIn addition to the previously described nikkomycin Z, the structure of which could be confirmed, a new chitin synthase inhibiting component, nikkomycin X, could be isolated from the culture filtrate of Streptomyces tendae. Nikkomycin X is a structural isomer of nikkomycin Z and contains a 4-formyl-4-imidazolin-2-one unit instead of uracil. The structure was established by spectroscopic methods, chemical degradation and partial synthesis. Biological activity and antibiotic spectra of the two nikkomycins are similar.
    Notes: Neben dem bereits früher beschriebenen Nikkomycin Z, dessen Struktur bestätigt werden konnte, wurde aus dem Kulturfiltrat von Streptomyces tendae eine weitere die Chitinsynthase hemmende Komponente, Nikkomycin X, isoliert, die mit Nikkomycin Z strukturisomer ist, aber anstelle von Uracil 4-Formyl-4-imidazolin-2-on enthält. Die Struktur wurde mit spektroskopischen Methoden, durch chemischen Abbau und durch Teilsynthesen bewiesen. Die biologischen Aktivitäten und die Wirkungsspektren der beiden Nikkomycine sind ähnlich.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919791007
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  • 9
    Electronic Resource
    Electronic Resource
    The C-Terminal Heptapeptides of Suzukacillin A and Alamethicin F30  -  Sequence, Conformation, and Synthesis (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 365-377 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die C-terminalen Heptapeptide von Suzukacillin A und Alamethicin F30  -  Sequenz, Konformation und SyntheseWährend der Sequenzierung des membranmodifizierenden Eikosapeptidantibiotikums Suzukacillin A wurden zwei C-terminale Heptapeptide durch selektive Trifluoracetolyse erhalten: L-Pro-L-Val-Aib-D-Iva-L-Gln-L-Phl und L-Pro-L-Val-Aib-Aib-L-Gln-L-Gln-L-Phl. Der chromatographische und spektroskopische Vergleich (FAB-MS, FD-MS, 13C-NMR, CD, UV) dieser isolierten natürlichen Fragmente mit dem synthetischen Segment L-Pro-L-Val-Aib-Aib-L-Gln-L-Gln-L-Phl (2) und dem synthetischen C-terminalen Segment von Alamethicin F30 L-Pro-L-Val-Aib-Aib-L-Glu-L-Gln-L-Phl (1) beweist die Sequenz 14-20 von Suzukacillin A.
    Notes: During the sequencing of the membrane-modifying eicosapeptide antibiotic suzukacillin A two C-terminal heptapeptides were obtained via selective trifluoroacetolysis: L-Pro-L-Val-Aib-D-Iva-L-Gln-L-Gln-L-Phl and -Pro-L-Val-Aib-Aib-L-Gln-L-Phl. The chromatographic and spectroscopic comparison (FAB MS, FD MS, 13C NMR, CD, UV) of these isolated natural fragments with the synthetic segment L-Pro-L-Val-Aib-Aib-L-Gln-L-Gln-L-Phl (2) and the synthetic C-terminal segment of alamethicin F30 L-Pro-L-Val-Aib-Aib-L-Glu-L-Gln-L-Phl (1) proved the sequence 14-20 of suzukacillin A.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850212
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  • 10
    Electronic Resource
    Electronic Resource
    Drei neue Aminosäuren aus dem Nikkomycin-Komplex  -  Strukturaufklärung und Synthese (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 407-421 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Three Novel Amino Acids from the Nikkomycin Complex - Structure Elucidation and SynthesisFrom the culture medium of Streptomyces tendae Tue 901 some new metabolites were characterized: 2-amino-4-hydroxy-3-methyl-4-(2-pyridyl)butanoic acid (1) [nikkomycin E], its isomer 2-amino-4-hydroxy-3-methyl-4-(3-pyridyl)butanoic acid (2) [as N-terminal constituent of the nikkomycins Px (5) and Rz (6)], and 2-amino-4-hydroxy-4-(2-pyridyl)butanoic acid (3) [as N-terminal amino acid of the nikkomycins Kx (7) and Kz (8)]. The structure elucidation was achieved by NMR, mass spectrometry and by comparison with synthetic reference compounds.
    Notes: Aus dem Kulturfiltrat von Streptomyces tendae Tue 901 wurden weitere neue Metabolite charakterisiert: 2-Amino-4-hydroxy-3-methyl-4-(2-pyridyl)buttersäure (1) [Nikkomycin E], die dazu isomere 2-Amino-4-hydroxy-3-methyl-4-(3-pyridyl)buttersäure (2) [als N-terminaler Baustein der Nikkomycine Px (5) und Rz (6)] und 2-Amino-4-hydroxy-4-(2-pyridyl)buttersäure (3) [als N-terminale Aminosäure der Nikkomycine Kx (7) und Kz (8)]. Die Strukturaufklärung erfolgte durch Kernresonanz, Massenspektrometrie und durch Vergleich mit entsprechenden Syntheseprodukten.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860301
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