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  • 1
    Digitale Medien
    Digitale Medien
    Soil properties and distributions of invertebrates and bacteria from King George Island (Arctowski Station), maritime Antarctic (1997)
    Springer
    Polar biology 18 (1997), S. 295-304 
    Details
    ISSN: 1432-2056
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Soils of the Admiralty Bay region at King George Island, maritime Antarctic are described and analysed for invertebrates and microorganisms. Results showed a great variety of soils: cambisols, umbrisols, regosols, podzols, leptosols, gleysols and relic ornithogenic soils were found. Surface layers, especially of cambisols, umbrisols and podzols, showed a diverse fauna, governed by nematodes, collemboles and mites. The bacterial flora is analysed for total counts and biomass distribution in different layers using epifluorescence microscopy. Influences of soil organic matter can be described by different patterns of mean bacterial cell volumes related to soil cover and depth distributions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003000050191
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  • 2
    Digitale Medien
    Digitale Medien
    Molekülstruktur, elektrochemisches verhalten und NK XANES von 1,4-Bis(pyrrol-1-yl-carbonyl)benzol (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 217-224 
    Details
    ISSN: 1434-4475
    Schlagwort(e): 1,4-bis(pyrrol-1-yl-carbonyl)benzene ; Synthesis ; Molecular structure ; Cyclovoltammetry ; NK XANES
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Summary The molecular structure and the cyclovoltammetric behaviour of 1,4-bis(pyrrol-1-yl-carbonyl)benzene (1) are described. The X-ray absorption spectrum of1 (NK XANES) is investigated with respect to the N1s → π* transitions in comparison with 1H-pyrrole.
    Notizen: Zusammenfassung Die Molekülstruktur und das cyclovoltammetrische Verhalten von 1,4-Bis-(pyrrol-1-yl-carbonyl)benzol (1) werden beschrieben. Das Röntgenabsorptionsspektrum von1 (NK XANES) wird bezüglich der N1s → π*-Übergänge im Vergleich mit 1H-Pyrrol untersucht.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00807887
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  • 3
    Digitale Medien
    Digitale Medien
    The impact of a low humus level in arable soils on microbial properties, soil organic matter quality and crop yield (1999)
    Springer
    Biology and fertility of soils 28 (1999), S. 156-161 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Soil cultivation ; Carbon loss ; Microbial biomass ; Enzyme activities ; Soil organic matter quality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  In arable soils in Schleswig-Holstein (Northwest Germany) nearly 30% of the total organic C (TOC) stored in former times in the soil has been mineralized in the last 20 years. Microbial biomass, enzyme activities and the soil organic matter (SOM) composition were investigated in order to elucidate if a low TOC level affects microbial parameters, SOM quality and crop yield. Microbial biomass C (Cmic) and enzyme activities decreased in soils with a low TOC level compared to soils with a typical TOC level. The decrease in the Cmic/TOC ratio suggested low-level, steady-state microbial activity. The SOM quality changed with respect to an enrichment of initial litter compounds in the top soil layers with a low TOC level. Recent management of the soils had not maintained a desirable level of humic compounds. However, we found no significant decrease in crop yield. We suggest that microbial biomass and dehydrogenase and alkaline phosphatase activities are not necessarily indicators of soil fertility in soils with a high fertilization level without forage production and manure application.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003740050478
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  • 4
    Digitale Medien
    Digitale Medien
    S-(N-(Thiocarbamoyl)benzimido)-dithiocarbamidsäureester (1996)
    Springer
    Monatshefte für Chemie 127 (1996), S. 291-296 
    Details
    ISSN: 1434-4475
    Schlagwort(e): S-(N-(Thiocarbamoyl)benzimido)dithiocarbamic esters ; Synthesis ; 13C NMR spectroscopy ; Side reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Summary The synthesis of the title compounds3 (R 1=R 2=C2H5;n-C4H9) by reactions of N-(N′,N′-diethylthiocarbamoyl)benzimidechloride (2) with sodiumdialkyldithiocarbamates (1) in acetone is described. The low yields (〈25%) are caused by the occurrence of side reactions. The structures of the compounds were confirmed by IR,1H and13C NMR, and mass spectroscopy. Side reactions were detected by13C NMR spectroscopy; the results are discussed.
    Notizen: Zusammenfassung Die Synthese der Titelverbindungen3 (R 1=R 2=C2H5;n-C4H9) durch Reaktionen von N-(N′,N′-Diethylthiocarbamoyl)-benzimidoylchlorid (2) mit Natriumdialkyldithiocarbamaten (1) in Aceton wird beschrieben. Die niedrigen Ausbeuten (bis 25% d.Th.) sind durch Nebenreaktionen bedingt. Die Strukturen der Verbindungen werden durch IR-,1H-NMR-,13C-NMR-und Massenspektren bestätigt. Nebenreaktionen werden13C-NMR-spektroskopisch verfolgt und die Ergebnisse diskutiert.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00813794
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  • 5
    Digitale Medien
    Digitale Medien
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis–field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335954
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  • 6
    Digitale Medien
    Digitale Medien
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis-field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335954
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  • 7
    Digitale Medien
    Digitale Medien
    Preconcentration and voltammetric behaviour of Ag+ at carbon paste electrodes modified by N-benzoyl-N′,N′-di-i-butyl-thiourea (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 263-266 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The preconcentration of silver at carbon paste electrodes (CPE) modified with N-benzoyl-N′,N′-di-i-butyl-thiourea and its subsequent voltammetric determination is studied with test solutions. The preconcentration of silver at the surface of the modified CPE succeeds as well with open circuits as with applied potentials. The amount preconcentrated depends on the electrode potential with a maximum at +0.1 V vs. Ag/AgCl, thus enabling the preconcentration of silver without cathodic treatment. The detection limit is in the order of 10–4 mmol/l Ag+. The surface reactions during the preconcentration are discussed. It is assumed that silver complexes of the modifier are formed in a fast reaction followed by a slow reaction with participation of silver and of carbon surface groups.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s0021663560263
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  • 8
    Digitale Medien
    Digitale Medien
    Ligand Properties of N-Acyl-thiocarbamic-O-alkylesters - A new class of aza-analogous 1,3-thioxoketones (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 184-188 
    Details
    ISSN: 0941-1216
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A series of six N-benzoyl-thiocarbamic-O-alkylesters (R=Me, Et, i-Pr, Benzyl, n-Hex, n-Dodec; 1-6) has been prepared and characterized. They are weak monoprotic acids. The compounds behave as fairly stable and versatile bidentate (O,S)-chelating ligands towards multivalent metal ions e. g. Ni(II), Cu(II), Pb(II) the stability constants of which have been determined in 75 vol% dioxane/water. The molecular structure of bis(O-ethyl-N-benzoylthiocarbamato)nickel(II) 2a is presented. The coordination of the nickel atom is square planar with the two sulphur atoms in cis position.
    Zusätzliches Material: 4 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.19953370141
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  • 9
    Digitale Medien
    Digitale Medien
    Gold(I)-Komplexe von N-Thiocarbamoylbenzamidinen: Synthese und StrukturenProfessor Wolfgang Beck zum65. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1021-1026 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Gold(I) complexes ; N-thiocarbamoyl benzamidine ligands ; X-ray structure ; linear coordination ; intermolecular hydrogen bonds ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Gold(I) Complexes of N-Thiocarbamoyl Benzamidines: Synthesis and StructuresBy reaction of tetrachlorogold(III) acid with N-thiocarbamoyl benzamidines HL complexes of composition AuI(HL)Cl have been obtained. The molecular structures of three complexes have been determined by single crystal X-ray diffraction methods. All complexes show linear coordination in which the ligand HL coordinates by the S atom and the second coordination site of gold(I) is occupied by a chloro ligand. The bond lengths in the coordinated ligands HL do not change appreciably in comparison with the free ligands. In all investigated structures intermolecular hydrogen bonds of the type N—H … Cl are formed.
    Notizen: Durch Umsetzung von Tetrachlorogold(III)-säure mit N-Thiocarbamoylbenzamidinen HL wurden Komplexverbindungen der Zusammensetzung AuI(HL)Cl erhalten. Die Molekülstrukturen von drei Komplexen wurden durch Röntgenkristallstrukturanalyse bestimmt. Alle Komplexe weisen eine lineare Koordination auf, wobei der Ligand HL über das Schwefel-Atom koordiniert und die zweite Koordinationsstelle am Gold(I) durch einen Chloro-Liganden besetzt ist. Die Bindungslängen in den koordinierten Liganden HL ändern sich gegenüber denen der freien Liganden nur geringfügig. In allen untersuchten Strukturen liegen intermolekulare Wasserstoffbrückenbindungen des Typs N—H … Cl vor.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.199762301160
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  • 10
    Digitale Medien
    Digitale Medien
    Die Chelatbildung von N-Tris(2-aminoethyl)amin-N′,N′,N″,N″,N‴,N‴-hexaessigsäure (H6TTAHA) und N-(Pyrid-2-yl-methyl)ethylendiamin-N,N′,N′-triessigsäure (H3PEDTA) mit Gadolinium(III) - Synthesen, Komplexstabilität und NMR-RelaxivitätProfessor Egon Uhlig zum 65. Geburtstag gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 807-811 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chelates, Gadolinium(III) ; Stability Constants ; 1H-NMR Relaxivity ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Chelate Formation of N-Tris(2-aminoethyl)amine-N′,N′,N″,N″,N‴,N‴-hexaacetic Acid (H6TTAHA) and N-(Pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic Acid (H3PEDTA) with Gadolinium(III) - Syntheses, Stability Constants, and NMR-RelaxivitiesThe chelate formation of N-tris(2-aminoethyl)amine-N′,N′,N″,N″,N‴,N‴-hexaacetic acid (H6TTAHA) and N-(pyrid-2-yl-methyl)ethylenediamine-N,N′,N′-triacetic acid (H3PEDTA) with gadolinium(III) has been studied potentiometrically in aqueous solution at 25°C and μ = 0.1 (KCl). [Gd(TTAHA)]3-: 1gβM/ML = 19.0; {H[Gd(TTAHA)]}2-: 1gKH/MHL = 8.30; [Gd(PEDTA)]: 1gβM/ML = 15.56. Both 1 : 1 gadolinium(III) complexes were isolated as Na2H[Gd(C18H24N4O12)] · 3.5 H2O and [Gd(C14H16N3O6)] · 3 H2O, respectively. Their 1H-NMR relaxivities [1 · mmol-1 · s-1] ({H[Gd(TTAHA)]}2-: 9.5; [Gd(PEDTA)]: 8.8) offer promising applications for 1H-NMR imaging.
    Notizen: Die Komplexbildung von N-Tris(2-aminoethyl)amin-N′,N′,N″,N″,N‴,N‴-hexaessigsäure (H6TTAHA) und N-(Pyrid-2-yl-methyl)ethylendiamin-N,N′,N′-triessigsäure (H3PEDTA) mit Gadolinium(III) wurde in wässeriger Lösung bei 25°C und μ = 0,1 (KCl) potentiometrisch untersucht. [Gd(TTAHA)]3-: 1gβM/ML = 19,0; {H[Gd(TTAHA)]}2-: 1gKH/MHL = 8,30; [Gd(PEDTA)]: 1gβM/ML = 15,56. Die 1 : 1-Gadolinium(III)-Komplexe wurden im Fall der H6TTAHA als Dinatriumsalz Na2H[Gd(C18H24N4O12)] · 3,5 H2O, bei der H3PEDTA als Neutralkomplex [Gd(C14H16N3O6)] · 3 H2O erhalten. Ihre NMR-Protonenrelaxivitäten [1 · mmol-1 · s-1] ({H[Gd(TTAHA)]}2-; 9,5; [Gd(PEDTA)]: 8,8) eröffnen Anwendungen als Kontrastmittel für die Kernspintomographie.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19956210518
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