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  • 1
    Electronic Resource
    Electronic Resource
    Partial molar heat capacities of selected electrolytes and benzene in methanol and dimethylsulfoxide at 25, 40, and 80°C (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 885-906 
    Details
    ISSN: 1572-8927
    Keywords: Heat capacities ; flow calorimetry ; densities ; partial molar heat capacities ; alkali metal ions ; halide ions ; tetraphenylphosphonium ion ; tetraphenylborate ion ; single ion values ; methanol ; dimethylsulfoxide ; Debye-Hückel limiting law slopes ; electrostriction and charge effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A high temperature-high pressure flow heat capacity calorimeter, designed to operate to 350°C and 20 Mpa, has been constructed and tested with aqueous sodium chloride solutions to 80°C. The calorimeter has been used to measure the specific heats for solutions of NaBr, NaClO4, φ4PBR, NaBφ4, and benzene in methanol (MeOH) and dimethylsulfoxide (DMSO) at 40 and 80°C. A commercial calorimeter was used to measure the same systems at 25°C. Apparent molar heat capacities C〉p,ϕ have been evaluated and extrapolated to infinite dilution to obtain standard partial molar heat capacities $$\bar C_{p,2}^{\text{o}} $$ . For electrolytes $$\bar C_{p,2}^{\text{o}} $$ are positive and insensitive to temperature to 80°C in DMSO, but in MeOH, C p, 2 0 for simple electrolytes are negative and become increasingly negative with temperature. The behavior in MeOH is attributed to strong electrostriction by ionic charge and solvation of anions by MeOH molecules which increases with temperature. This is similar to observed behavior of electrolytes in water above 100°C. For benzene $$\bar C_{p,2}^{\text{o}} $$ is positive in MeOH and DMSO, and increases with temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650993
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  • 2
    Electronic Resource
    Electronic Resource
    Isentropic compressibilities of univalent electrolytes in methanol at 25°C (1984)
    Springer
    Journal of solution chemistry 13 (1984), S. 699-720 
    Details
    ISSN: 1572-8927
    Keywords: Apparent molar isentropic compressibility ; apparent molar volume ; electrolytes ; tetraalkylammonium ions ; tetraphenylphosphonium ion ; methanol ; single ion values ; Debye-Huckel limiting law
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A flow densimeter and an ultrasonic sound velocimeter have been used to measure densities and isentropic compressibilities of solutions of LiBr, NaCl, NaBr, Nal, KF, KCl, KBr, Kl, RbBr, Rbl, CsF, CsBr, Ph 4 PBr, and NaBPh 4 in anhydrous methanol at 25°C. the latter two electrolytes were also investigated in water at 25°C. Concentrations ranged from about 0.005 m to above 0.25m, solubility permitting. Apparent molar isentropic compressibilities, KS,ϕ, have been calculated and extrapolated to infinite dilution to obtain K S,ϕ o . The K S,ϕ o values in methanol are all negative, and significantly more negative than the corresponding data in water. Additional data from the literature for acetonitrile and ethanol solutions show that K S,ϕ o for the alkali metal halides become more negative in direct proportion to increasing solvent isentropic compressibility. Furthermore, the dependence of K S,ϕ o in ionic size also varies in proportion to solvent isentropic compressibility. An explanation of this behavior is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649010
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The role of the earthworm Lumbricus terrestris in the transport of bacterial inocula through soil (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 132-139 
    Details
    ISSN: 1432-0789
    Keywords: Key words Bacterial inocula lux modified ; Pseudomonas fluorescens ; Repacked soil microcosms ; Earthworms ; Lumbricus terrestris ; Leaching patterns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two laboratory experiments were used to investigate the effect of the earthworm Lumbricus terrestris on transport of genetically marked Pseudomonas fluorescens inocula through soil microcosms. The microcosms comprised cylindrical cores of repacked soil with or without earthworms. Late log-phase cells of P. fluorescens, chromosomally marked with lux genes encoding bioluminescence, were applied to the surface of soil cores as inoculated filter paper discs. In one experiment, 5 and 10 days after inoculation, cores were destructively harvested to determine concentrations of marked pseudomonads with depth relative to the initial inoculum applied. Transport of the bacteria occurred only in the presence of earthworms. In a second experiment cores were subjected to simulated rainfall events 18 h after inoculation with lux-marked bacteria at 3-day intervals over a 24-day period. Resulting leachates were analysed for the appearance of the marked bacteria, and after 28 days cores were destructively harvested. Although some marked cells (less than 0.1% of the inoculum applied) were leached through soil in percolating water, particularly in the presence of earthworms, the most important effect of earthworms on cell transport was through burial of inoculated litter rather than an increase in bypass flow due to earthworm channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336053
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The role of the earthworm Lumbricus terrestris in the transport of bacterial inocula through soil (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 132-139 
    Details
    ISSN: 1432-0789
    Keywords: Bacterial inocula lux modified ; Pseudomonas fluorescens ; Repacked soil microcosms ; Earthworms ; Lumbricus terrestris ; Leaching patterns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two laboratory experiments were used to investigate the effect of the earthworm Lumbricus terrestris on transport of genetically marked Pseudomonas fluorescens inocula through soil microcosms. The microcosms comprised cylindrical cores of repacked soil with or without earthworms. Late log-phase cells of P. fluorescens, chromosomally marked with lux genes encoding bioluminescence, were applied to the surface of soil cores as inoculated filter paper discs. In one experiment, 5 and 10 days after inoculation, cores were destructively harvested to determine concentrations of marked pseudomonads with depth relative to the initial inoculum applied. Transport of the bacteria occurred only in the presence of earthworms. In a second experiment cores were subjected to simulated rainfall events 18 h after inoculation with lux-marked bacteria at 3-day intervals over a 24-day period. Resulting leachates were analysed for the appearance of the marked bacteria, and after 28 days cores were destructively harvested. Although some marked cells (less than 0.1% of the inoculum applied) were leached through soil in percolating water, particularly in the presence of earthworms, the most important effect of earthworms on cell transport was through burial of inoculated litter rather than an increase in bypass flow due to earthworm channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336053
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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