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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Russian chemical bulletin 10 (1961), S. 1263-1263 
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Zusammenfassung Quantitative und qualitative Veränderungen in den Hauptkomponenten des Wachses, isoliert aus der bulgarischen Apfelsorte ‘Tetowka’, wurden während des Wachstums und der Lagerung der Früchte (vom 1. August bis zum 2. Januar des folgenden Jahres) verfolgt. Nach Verseifung des im Petroläther löslichen Teils des Wachses wurden die Proben in neutrale und saure Substanzen getrennt. Durch Gaschromatographie der Methylester der isolierten Säuren wurde die qualitative Zusammensetzung des Gemisches und der quantitative Gehalt der einzelnen Komponenten bestimmt. Die neutrale Fraktion wurde mit Hilfe der präparativen Dünnschichtchromatographie in Kohlenwasserstoffe, Ketone, primäre und sekundäre Alkohole getrennt und anschließend die verschiedenen Stoffgruppen ebenfalls gaschromatographisch bestimmt. Aus den Ergebnissen werden folgende biogenetische Schlüsse gezogen: 1. Die Komponenten des löslichen Wachses und des Kutins stammen von den im Inneren der Frucht synthetisierten Lipiden; 2. Die Paraffinkohlenwasserstoffe entstehen aus Fettsäuren, speziell dem C29-Kohlenwasserstoff, der sich aus der C16-Säure bildet; 3. Die Olefine entstehen aus den jeweiligen primären und sekundären Alkoholen, während die Diole sich aus den primären Alkoholen bilden; 4. Die Paraffinkohlenwasserstoffe, die sekundären Alkohole und die Ketone stehen im biogenetischen Zusammenhang und erleiden wechselseitige Umwandlungen.
    Abstract: Résumé On a suivi les changements quantitatifs et qualitatifs des constituants principaux de la cire isolée de la pelure des pommes de la variété bulgare ‘Tétovka’ au cours de leur croissance et pendant leur conservation (du ler août au 2 janvier l'année suivante). Après saponification de cette partie de la cire qui est soluble dans l'éther de pétrole, les échantillons sont divisés en matières neutres et acides. Par chromatographie en phase gazeuse des esters méthyliques des acides isolés, on a établi la composition qualitative et le contenu quantitatif des différents constituants du mélange. Par chromatographie préparative sur couche mince, de la partie neutre on a isolé des hydrocarbures, des cétones, des alcools secondaires et primaires. La composition qualitative et quantitative individuelle de tous ces composés a été également identifiée à l'aide de la chromatographie en phase gazeuse. A la suite des résultats obtenus, on est arrivé aux conclusions biogénétiques suivantes: 1. Les constituantes de la cire soluble et de la cutine proviennent des lipides synthétisés à l'intérieur du fruit; 2. Les hydrocarbures paraffiniques sont formés des acides gras, et plus spécialement, l'hydrocarbures C29 provient de l'acide C16; 3. Les. oléfines sont obtenus à partir des alcools primaires et secondaires respectifs, tandis que les diols se forment à partir des alcools primaires; 4. Les hydrocarbures paraffiniques, les alcools secondaires et les cétones se trouvent en corrélation biogénétique et subissent des transmutations réciproques.
    Notes: Abstract Quantitative and qualitative changes in the chief wax components, isolated from Bulgarian apples (Tetovka variety) were followed up during the period of growth and storage (from August 1st to January 2nd, the following year). After saponification of the soluble in light petroleum wax part, the samples were separated into neutral and acid substances. By means of gas-liquid chromatography of the methyl esters of the isolated acids, the qualitative composition and quantitative content of the individual components in the mixture were established. Using preparative thin-layer chromatography, hydrocarbons, ketones, secondary and primary alcohols were isolated from the neutral part. The individual qualitative and quantitative composition of all these compounds were also estimated by gas-liquid chromatography. On the basis of the results obtained the following biogenetic conclusions were made: 1. The constituents of soluble wax and cutin originate from lipids synthesized in the interior part of the fruit. 2. Paraffin hydrocarbons are formed by fatty acid, especially the C29 hydrocarbon is derived from the C16 acid; 3. Olefines are obtained from respective primary and secondary alcohols, while the diols are derived from primary alcohols; 4. Paraffin hydrocarbons, secondary alcohols and ketones are biogenetically linked and may undergo mutual transformations.
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Origins of life and evolution of the biospheres 14 (1984), S. 61-68 
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract In hot water extracts of samples from interior of two ordinary chondrites (Goumoshnik and Pavel) after acid hydrolysis using diphenylindonyl-isothiocyanate (DIITC) and fluorescent detection (FD) of the obtained diphenylindonyl thiohydantoins (ITH) 10 to 13 protein and nonprotein amino acids were found. In the same manner the presence of compounds containing amino groups but not of free amino acids was established in nonhydrolysed extracts. “Sequencing” was performed on the amino compounds using DIITC and FD of the cleaved ITH up to 9 steps with extracts of Goumoshnik and up to 14 with those of Pavel. At each step 1 to 6 different protein and nonprotein amino acids were liberated. The presence of nonprotein amino acids supports the view that the peptides in meteorites are indigenous.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Springer
    Origins of life and evolution of the biospheres 14 (1984), S. 177-184 
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The reaction schemes suggested earlier for thermal transformation of glycine into amino acids and carboxylic acids are considered in detail. Close analogy with some wide-spread biochemical reactions of amino acids is observed. The pathway suggested has some common stages with the tricarboxylic acid cycle and other metabolic processes. The possible role of α-imino or α-keto acids as prebiological analogs of pyridoxal-phosphate-containing enzymes is discussed. The thermal transformations of glycine under primitive Earth conditions could be considered as evolutionary precursors of some present-day metabolic pathways.
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  • 15
    Electronic Resource
    Electronic Resource
    Springer
    Origins of life and evolution of the biospheres 19 (1989), S. 289-290 
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical chemistry journal 5 (1971), S. 91-95 
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical chemistry journal 8 (1974), S. 724-730 
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical chemistry journal 10 (1976), S. 888-893 
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical chemistry journal 11 (1977), S. 176-180 
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Springer
    Pharmaceutical chemistry journal 7 (1973), S. 201-205 
    ISSN: 1573-9031
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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