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  • 1
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    In Vitro Study of Lipid Biosynthesis in an Anaerobically Methane-Oxidizing Microbial Mat (2005)
    American Society for Microbiology
    In:  Applied and Environmental Microbiology, 71 (8). pp. 4345-4351.
    Details
    Publication Date: 2017-07-07
    Description: The anaerobic oxidation of methane (AOM) is a key process in the global methane cycle, and the majority of methane formed in marine sediments is oxidized in this way. Here we present results of an in vitro 13CH4 labeling study (δ13CH4, ∼5,400‰) in which microorganisms that perform AOM in a microbial mat from the Black Sea were used. During 316 days of incubation, the 13C uptake into the mat biomass increased steadily, and there were remarkable differences for individual bacterial and archaeal lipid compounds. The greatest shifts were observed for bacterial fatty acids (e.g., hexadec-11-enoic acid [16:1Δ11]; difference between the δ13C at the start and the end of the experiment [Δδ13Cstart-end], ∼160‰). In contrast, bacterial glycerol diethers exhibited only slight changes in δ13C (Δδ13Cstart-end, ∼10‰). Differences were also found for individual archaeal lipids. Relatively high uptake of methane-derived carbon was observed for archaeol (Δδ13Cstart-end, ∼25‰), a monounsaturated archaeol, and biphytanes, whereas for sn-2-hydroxyarchaeol there was considerably less change in the δ13C (Δδ13Cstart-end, ∼2‰). Moreover, an increase in the uptake of 13C for compounds with a higher number of double bonds within a suite of polyunsaturated 2,6,10,15,19-pentamethyleicosenes indicated that in methanotrophic archaea there is a biosynthetic pathway similar to that proposed for methanogenic archaea. The presence of group-specific biomarkers (for ANME-1 and ANME-2 associations) and the observation that there were differences in 13C uptake into specific lipid compounds confirmed that multiple phylogenetically distinct microorganisms participate to various extents in biomass formation linked to AOM. However, the greater 13C uptake into the lipids of the sulfate-reducing bacteria (SRB) than into the lipids of archaea supports the hypothesis that there is autotrophic growth of SRB on small methane-derived carbon compounds supplied by the methane oxidizers.
    Type: Article , PeerReviewed
    Format: text
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Über Metaboliten von Thiocarlid (1969)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 1323-1336 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nach oraler Verabreichung des Tuberkulostatikums Thiocarlid (I) wurden im menschlichen Urin die beiden in den Seitenketten hydroxylierten Derivate VI und XI nachgewiesen; unverändertes Thiocarlid konnte nicht aufgefunden werden. Die durch Abbaureaktionen an amorphen Präparaten von VI und XI ermittelten Konstitutionen wurden durch Synthese sichergestellt. Im Verhältnis zur verabreichten Dosis von I sind die ausgeschiedenen Mengen von VI und XI nur gering.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19690520515
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  • 6
    Electronic Resource
    Electronic Resource
    Intramolekulare Beweglichkeit eines Dibenzo-[b, f]-1,4-thiazepin-5-oxids. 13. Mitteilung über siebengliedrige Heterocyclen12. Mitteilung: [1].Herrn Prof. Dr. W. FEITKNECHT zum siebzigsten Geburtstag gewidmet (1969)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 52 (1969), S. 2486-2491 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the equilibrium in aqueous solution between the diasteromers of 2-Chloro-11-(4-methyl-1-piperazinyl-4-oxide)-dibenzo-[b, f]-1,4-thiazepine-5-oxide (V) have been investigated. Both isomers differ in the position of the oxygen atom of the sulphoxide group. The sulphoxide group. The isomer with a pseudo-equatorial oxygen atom is 0.75 kcal/mol more stable than the isomer with the pseudo-axial oxygen atom. The calculated free energies of activation δG≠ are 24.6 kcal/mol and 23.9 kcal/mol.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19690520831
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Reaktion substituierter Thioxanthenoxide mit Säuren (1966)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 1483-1489 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 9-[(N-Methyl-3′-piperidyl)-methyl]-thioxanthene-10-oxide (I) on treatment with boiling concentrated hydrochloric acid gives mainly 9-[(N-methyl-3′-piperidyl)-methylene]-thioxanthene (IV) together with small amounts of 9-[(N-methyl-3′-piperidyl)-chloro-methylene]-thioxanthene(II), 9-hydroxy-9-[(N-methyl-3′-piperidyl)-methyl]-thioxanthene (III) and 9-[(N-methyl-3′-piperidyl)-methyl]-thioxanthene (V). Treatment of I with acetic anhydride yields only IV.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19660490509
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese von in 2-Stellung substituierten 2-Amino- und 3-Amino-1-indanonen (1966)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 49 (1966), S. 891-896 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An examination has been made of the reaction of secondary amines with 2-bromo-1-indanones II substituted at position C-2, and with 2-substituted indenones III. 2-Bromo-2-methyl-1-indanone (IIa) and dimethylamine yielded a mixture of the corresponding 2- and 3-amino-methylindanones IVa and Va. 2-Bromo-2-methyl-6-chloro-1-indanone (II b) and morpholine gave a mixture of the 2- and 3-aminocompounds IVe and Ve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19660490211
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  • 9
    Electronic Resource
    Electronic Resource
    Über die Stereochemie von Zwischenprodukten (Aldolbasen) der Doebner-von Miller-Chinolin-Synthese (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 776-779 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the Doebner-von Miller quinoline synthesis with acetaldehyde or crotonaldehyde two stereoisomeric 4-hydroxy-1, 2, 3, 4-tetrahydroquinaldines are formed as intermediates. The stereochemistry of these compounds differing in the relative positions of the hydroxygroups to the methyl-group can be ascertained by NMR.-spectroscopy. The pKa-values of stereoisomers are not identical due to the different spacial positions of the HO-groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530412
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  • 10
    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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