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  • 1995-1999  (3)
  • 1960-1964  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Chemically bound chlorinated aromatics in humic substances (1995)
    Springer
    Naturwissenschaften 82 (1995), S. 139-142 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177275
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemically Bound Chlorinated Aromatics in Humic Substances (1995)
    Springer
    Naturwissenschaften 82 (1995), S. 139-142 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01177275
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cold seep deposits of Beauvoisin (Oxfordian; southeastern France) and Marmorito (Miocene; northern Italy): microbially induced authigenic carbonates (1999)
    Springer
    International journal of earth sciences 88 (1999), S. 60-75 
    Details
    ISSN: 1437-3262
    Keywords: Key words Carbonates ; Cold seeps ; Methane ; Petroleum ; Archaea ; Bacteria ; Sponges ; Tube worms ; Epifluorescence ; Biomarkers ; Jurassic ; Tertiary ; France ; Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The relation of two well-known ancient carbonate deposits to hydrocarbon seepage was confirmed by this study. Archaea are found to be associated with the formation of Oxfordian seep carbonates from Beauvoisin and with a Miocene limestone from Marmorito ("tube-worm limestone"). Carbonates formed due to a mediation by archaea exhibit extremely positive or extremely negative δ13Ccarbonate values, respectively. Highly positive values (+15‰) reflect the use of 13C-enriched CO2 produced by methanogenesis. Low δ13C values of the Marmorito carbonates (–30‰) indicate the oxidation of seepage-derived hydrocarbons. Likewise, the δ13C content of specific tail-to-tail linked isoprenoids, biomarkers for archaea, was found to be strikingly depleted in these samples (as low as –115‰). The isotopic signatures corroborate that archaea were involved in the cycling of seepage-derived organic carbon at the ancient localities. Another Miocene limestone ("Marmorito limestone") shows a strong imprint of methanotrophic bacteria as indicated by δ13C values of carbonate as low as –40‰ and biomarker evidence. Epifluorescence microscopy and field-emission scanning electron microscopy revealed that bacterial biofilms were involved in carbonate aggregation. In addition to lucinid bivalves previously reported from both localities, we infer that sponges from Beauvoisin and tube worms from Marmorito depended on chemosynthesis as well. Low δ13C values of nodules related to sponge taphonomy (–27‰) indicate that sponges might have been linked to an enhanced hydrocarbon oxidation. Tube worm fossils from Marmorito closely resemble chemosynthetic pogonophoran tube worms from Recent cold seeps and are embedded in isotopically light carbonate (δ13C –30‰).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050246
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  • 4
    Electronic Resource
    Electronic Resource
    Löslichkeitsprodukte von Metalloxiden und -hydroxiden. 8. Mitteilung. Die Löslichkeit gealterter Eisen(III)-hydroxid-Fällungen (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 444-449 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solubility of aged iron(III) hydroxide precipitates was investigated by determining [Fe3+] and [H+] of solutions in contact with the solid phases. [Fe3+] and [H+] were measured by the EMF.-method at the constant ionic strength 3M (Na)C104. The precipitates were investigated by X-ray and electron microscope methods. The following equilibrium constants were derived:
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460204
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese einiger Thioxanthen-DerivateHerrn Professor A. v. Muralt zum 60. Geburtstag gewidmet (1963)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1097-1108 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of some thioxanthene derivatives as possible metabolites of Methixerc (VI-hydrochloride) is described. The VON BRAUN degradation of VI with cyanogen bromide leads to the demethyl derivative 9- [(3-piperidyl)-methyl]-thioxanthene (VIII). Oxidation of Methixen with hydrogen peroxide at 20° gives a mixture of the two steroisomerie sulfoxides IX and X; they were separated by preparative paper-chromatography. The same oxidant at 100° oxidizes Methixelz to the sulfone IV. This was also obtained by alkylation of thioxanthene-10, 10-dioxide (11). On oxidation with hydrogen peroxide the demethyl derivative VIII affords at 20° the sulfoxide XI (isolated in non-uniform steric state), and at 100° the sulfone V. Alkylation of thio-xanthene with N-methyl-3-chloromethyl-piperidine-N-oxide (I) leads to -[(N- methyl-3-piperidyl)-methyl]-thioxanthene-N-oxide (111), the constitution of which was proved by conversion to VI.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19630460402
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Über die Alkylierung von Indazolonen (1964)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 47 (1964), S. 1986-1996 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The alkylation of Indazolone (V) resp. 1-Carbethoxy-indazolone (I) is reported. The structures of the reaction products were ascertained with the help of IR. and UV. spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19640470739
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Hydrolyse von Eisen(III)-perchlorat-Lösungen (1962)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 212-224 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The authors investigate the reaction products formed, when Fe(H2O)36+ is deprotonated in perchlorate solutions. When a small amount of base is added, metastable solutions containing the ions Fe(H2O)3+, Fe(H2O)5OH2+, Fe2(H2O)8(OH)4+ and Fe(H2O)4(OH)+ are formed, and α-FeOOH slowly crystallises out. In a narrow intermediate range immediately after adding the base, colloidal amorphous Fe(OH)3 and crystalline α-FeOOH are formed. If more base is added a dark brown solution of colloidal amorphous Fe(OH)3 results, in which the crystallisation of α-FeOOH, under certain conditions also of γ-FeOOH, begins after an induction period of several days. Only when a nearly equivalent amount of base is added, Fe(OH)3 is precipitated. On ageing, this changes partly into α-Fe2O3, partly into α-FeOOH, a rather large amount remaining amorphous. In all the systems, no stable state is reached at room temperature, even after years. If a small amount of Fe2+ ions is coprecipitated, a complete crystallisation of the amorphous hydroxide to α-FeOOH takes place. The mechanism of the formation of the crystalline phases is discussed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19620450127
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