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  • Organic Chemistry  (3,129)
  • Cell & Developmental Biology
  • LUNAR AND PLANETARY EXPLORATION
  • 1965-1969  (4,053)
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Keywords
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 699 (1966), S. 98-106 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vom Chinolin ausgehend werden Chinolin-carbaldehyd-(3) und einige seiner Substitutionsprodukte synthetisiert. Die Aldehyde dienen zur Darstellung pharmazeutisch interessanter Chinolinderivate.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 728 (1969), S. 144-151 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Absolute Configuration of I+)- and {-)-2-Amino-tetralin and of the four Isomeric 2-Amino-tetralols- ( I )Maintaining its configuration, L-(+)-aspartic acid is converted to (-)-(2S)-2-amino-tetralin, and its absolute configuration thus determined. The hydrogenolysis of three of the four isomeric 2-amino-tetralols-(1) 7a, 7b, and 7c with Pd led to the optically pure (+)- and (-)-2-amino-tetralins (6a and 6b), which allows one to make a definite statement regarding the steric structure of the levo- and dextrorotatory cis- and trans-2-amino-tetralols-(1). It could be shown that, contrary to previous assumptions, based on CD-spectra, (+)-(1S, 2R)-2-amino-tetralol-(1) (7c) does not have the same absolute configuration as L-(-)-ephedrine, with the absolute configuration (1R, 2S). Therefore for arylaminoethanols, it is not possible to correlate the open-chained and cyclic compounds to one another by means of the CD-spectraalone.
    Notes: 1.-(+)-Asparaginsäure wird unter Erhaltung ihrer Konfiguration in (-)-(2S)-2-Amino-tetralin umgewandelt und damit dessen absolute Konfiguration festgelegt. Durch Hydrogenolyse von drei der vier isomeren 2-Amino-tetralole-(1) 7a, 7b, 7c mit Palladium werden (+)- und (-)-2-Amino-tetralin (6a und 6b) optisch rein erhalten, was Rückschlüsse auf die räumliche Struktur der links- und rechtsdrehenden cis- und trans-2-Amino-tetralole-(1) zuläßt. Es zeigt sich, daß entgegen früheren Annahmen, denen circulardichroitische Messungen zu Grunde lagen, (+)-(1S, 2R)-2-Amino-tetralol-(1) (7c) nicht dieselbe absolute Konfiguration besitzt wie L-(-)-Ephedrin mit der absoluten Konfiguration (1R, 2S). Es ist daher bei Arylaminoäthanolen nicht möglich, ohne weiteres durch CD-Spektren offenkettige und cyclische Verbindungen einander zuzuordnen.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Polycrylamide gel electrophoresis of chicken lens proteins showed 17 crystallins, divided over three groups. Within each group physicochemical heterogeneity was combined with (partial) immunological homogeneity. It is assumed that more than one gene is involved in the synthesis of any crystallin species. During development of the chicken embryo, α-crystallin was first demonstrated by immunofluorescence in centrally located lens fibers at 3 days. At 8 days the epithelium became positive and the fibers lost some fluorescence. This continued until in 5-week-old chickens the lens core was negative. Lens placode cells showed immunofluorescence for δ-crystallin at 52 hours, mainly in their basal parts. The reaction gradually spread and at 3 days the entire lens was positive. From 8 days on the epithelium reacted progressively weaker, but the fibers remained positive. Five weeks after hatching, epithelium and cortex were negative, while the center still showed strong fluorescence. The behavior of β-crystallin was intermediate between that of the other two. Immunoelectrophoresis suggested a differential production onset for the components of each single crystallin type. Under normal conditions no crystallins were found outside the lens. Therefore, crystallin synthesis occurs after placode formation has taken place and must be restricted to the lens itself. Autoradiography after 3H-thymidine treatment indicated that all placode cells still replicate, though some already produce crystallins. A generation time of 8 to 10 hours was determined with an M phase of 30 minutes, an S phase of 6 hours, and a G2 of 2 ½ hours. During DNA synthesis the nuclei were located in the basal parts of the cells, and for mitosis they migrated to the lumen. Autoradiography after 3H-glucosamine application suggested that the placode cells take active part in the synthesis of the basement membrane interposed between lens rudiment and optic cup. This membrane later becomes the lens capsule, and in mice with the “shrivelled” gene, abnormal masses of anterior epithelial cells also clearly produce extra capsule material. This results in anterior polar cataracts. Several of the above findings are in disagreement with some of the current theories on the regulation of lens differentiation. No substitutes are presently offered, however.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 2594-2597 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From cultures of Myrothecium roridum TODE ex FRIES 2′-dehydroverrucarin (1) was isolated. 1 is a genuin metabolite of the micro-organism.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 48 (1965), S. 840-857 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of verrucarin A (1) has been confirmed by a stepwise oxidative degradation of mono-O-acetyl-β-epoxy-verrucarin (6).
    Additional Material: 6 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 2449-2458 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of the hitherto unknown 14-epi-digitoxigenin (8) and of 3-deoxy-digitoxigenin (16) is described. The 15,15-propylene-thio-sulfoxides 6 and 7 proved to be valuable intermediates. The results of the cardiotonic activity (ATPase test) of the cardenolides 8 and 16 are reported.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 33 (1966), S. 307-308 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: P-Aminophenylessigsäure läßt sich in einfacher Weise gewinnen, in dem man das Natriumasalz der p-Nitrophenylessigsäure mit Hydrazin in wäßriger Lösung unter katalytischer Einwirkung von RANEY-Nickel umsetzt. Die erzielten Ausbeuten sind praktisch quantitativ.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 35 (1967), S. 175-176 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2,2′-Bichinolin wird durch Decarboxylierung von 2,2′-Bicinchoninsäure im Vakuum unter Schutzgas in ausgezeichneter Ausbeute und hoher Reinheit erhalten. Die zur Erleichterung der Kohlendioxid-Abspaltung eingesetzte Trägersubstanz dient hierbei gleichzeitig als Lösungsmittel für das entstandene Reaktionsprodukt.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 717 (1968), S. 73-79 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der thermischen Zersetzung des 6-Methoxy-1.3-di-tert.-butyl-chinolhydroperoxids (5) entstehen als Hauptprodukte Sauerstoff, 4.6-Di-tert.-butyl-resorcin-monomethyläther (7) und 5-Methoxy-2-tert.-butyl-benzochinon (11), als Nebenprodukte der tert.-Butyläther 13a sowie zwei Biphenyl-Derivate 9 und 10a. Demnach beginnt der Zerfall sowohl durch Homolyse der C-OO- als auch der O-O-Bindungen, und es treten freie Phenoxyl-Radikale als Zwischen-produkte auf. Die durch Säure bewirkte Abspaltung von Isobuten und Wasser aus 5 führt heterolytisch zu 11.
    Additional Material: 1 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 466-474 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The autoxidation of two cuprous complexes, Cu(NH3)2+ and Cu(imidazole)2+, has been studied by following the oxygen consumption with a coated oxygen sensor, and the formation of CuII by means of a stopped flow technique. The reaction was found to be of third order being proportional to the concentrations of CuI, oxygen, and free ligand. pH variation was without effect in the range studied. The rate constants are kIM = 5,5 ·103 12· Mol-2·s-1 for imidazole, and kNH3 = 1,6·104 12· Mol-2· s-1 for NH3 as ligand, resp. An apparent activation energy of less than 2 Kcal/mole has been found for the autoxidation of the cuprous imidazole complex. This can be explained by the assumption of a rapidly playing equilibrium proceeding the rate determining step.
    Additional Material: 3 Ill.
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