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  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic excess quantities in the adsorption of sodium alkylsulfonates at the air-solution interface (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 183-187 
    Details
    ISSN: 1435-1536
    Keywords: Sodium alkylsulfonates ; air-solution interface ; thermodynamic excess quantities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Data on the surface tension of sodium alkylsulfonate solutions at different temperatures and surfactant concentrations are presented. By applying the thermodynamic treatment of Guggenheim, changes in the thermodynamic excess quantities associated with the adsorption were evaluated. The entropy, enthalpy and internal energy of interface formation are positive and become more positive as both the surfactant concentration and the temperature increase. The adsorption of alkylsulfonate ions at the air-solution interface is a favorable process from the entropic viewpoint, while it is an unfavorable one from the energetic viewpoint. The increase of the entropy overcomes the disadvantage of the gain of energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410700
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of packing density of cellulose plugs on streaming potential phenomena (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 688-693 
    Details
    ISSN: 1435-1536
    Keywords: Streaming potential ; cellulose plugs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental investigation on streaming potentials of porous plugs of cellulose in both the linear and the non-linear range is described. The variation of the electrokinetic coefficients as a function of fibre concentration in the porous pad has been studied, using solutions of different concentration of Congo Red dye as a permeant. The trend observed for changes of both linear electrokinetic coefficientL 21 and non-linear coefficientL 211 as packing density,c F, increases, is somewhat analogous, the similarity suggesting some proportionality between both coefficients. The electroviscous effect accounts for the decrease ofL 211 with the increase ofc F. The coefficientL 221 was found to be always negative and, in absolute value, to decrease with increasingc F. Second-order coefficients have been interpreted in terms of modifications of “generalized conductivities” produced by the changes of thermodynamic forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415041
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  • 3
    Electronic Resource
    Electronic Resource
    Electrophoretic behaviour of calcium oxalate monohydrate in liquid mixtures (1985)
    Springer
    Colloid & polymer science 263 (1985), S. 941-947 
    Details
    ISSN: 1435-1536
    Keywords: Electrophoretic mobility ; calcium oxalate monohydrate ; liquid mixture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental investigation on electrophoresis of calcium oxalate monohydrate in several liquid mixtures (methanol-, ethanol-, 2-propanol-, and methanol-acetonewater) is described. The electrophoretic transport is considered from the view-point of the Thermodynamics of Irreversible Processes. Linear relations have always been found between the mass flux and the applied electric field. The ζ-potential of the interface C.O.M./liquid mixture has been estimated by using the classial theory of electrophoretic mobility of colloidal particles. The influence of the composition of the mixture on the electrophoretic coefficient has been discussed on the basis of the variation of ζ-potential, viscosity and dielectric constant with the molar fraction of alcohol for binary mixtures and acetone for ternary mixtures. The concentration dependence of the electrophoretic coefficient is found to be linear only in the latter case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01469634
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  • 4
    Electronic Resource
    Electronic Resource
    On the electrophoretic mobility and zeta potential of montmorillonite in non-aqueous media (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 435-438 
    Details
    ISSN: 1435-1536
    Keywords: Electrophoresis ; montmorillonite ; zeta potential ; double layer thickness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experimental results on the electrophoretic velocity and mobility of Ca-montmorillonite in 2-propanol are reported. The variation of the electrophoretic velocity with the externally applied electric field and the particle size range, at constant volume fraction and temperature, is considered. Given the difficulties for determining the types and concentrations of ions present in these liquid media, two methods are discussed for the estimation of the double layer thickness and hence the productκα, necessary for the determination of the zeta potential (ζ) of the interface. Although both methods of calculation yield different values ofκα, the results for the zeta potential are very similar in the regions ofκα andζ characteristic of our systems. The application to the experimental data of three theoretical relations between electrophoretic mobility and zeta potential is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419547
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  • 5
    Electronic Resource
    Electronic Resource
    A network thermodynamic method for numerical solution of the Nernst-Planck and Poisson equation system with application to ionic transport through membranes (1990)
    Springer
    European biophysics journal 17 (1990), S. 307-313 
    Details
    ISSN: 1432-1017
    Keywords: Network thermodynamics ; ionic transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Simple techniques of network thermodynamics are used to obtain the numerical solution of the Nernst-Planck and Poisson equation system. A network model for a particular physical situation, namely ionic transport through a thin membrane with simultaneous diffusion, convection and electric current, is proposed. Concentration and electric field profiles across the membrane, as well as diffusion potential, have been simulated using the electric circuit simulation program, SPICE. The method is quite general and extremely efficient, permitting treatments of multi-ion systems whatever the boundary and experimental conditions may be.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00258379
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  • 6
    Electronic Resource
    Electronic Resource
    In vivo inhibition of nitrogenase by hydroxylamine in Rhodospirillaceae Role of nitric oxide (1992)
    Springer
    Archives of microbiology 158 (1992), S. 14-18 
    Details
    ISSN: 1432-072X
    Keywords: Hydroxylamine ; Nitric oxide ; Nitrogenase ; Phototrophic bacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhodobacter capsulatus strains E1F1 and B10 and Rhodobacter sphaeroides DSM 158 did not use hydroxylamine as nitrogen source for growth but metabolized it mainly through the glutamine synthetase reaction. Hydroxylamine had a high toxicity for cells growing either under phototrophic or dark-aerobic conditions. l-methionine-d,l-sulfoximine partially inhibited hydroxylamine uptake and increased the inhibition time of nitrogenase activity by this nitrogen compound. Nitric oxide was also a powerful inhibitor of nitrogenase in intact cells of R. capsulatus. Since low amounts of NO were produced from hydroxylamine, short-term inhibition of nitrogenase in the presence of this compound could be mediated in vivo by nitric oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249059
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  • 7
    Electronic Resource
    Electronic Resource
    Degradation of p-nitrophenol by the phototrophic bacterium Rhodobacter capsulatus (1997)
    Springer
    Archives of microbiology 169 (1997), S. 36-42 
    Details
    ISSN: 1432-072X
    Keywords: Key words Biodegradation ; Nitrophenol ; Nitrocatechol ; Phototrophic bacteria ; Rhodobacter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phototrophic bacterium Rhodobacter capsulatus detoxified p-nitrophenol and 4-nitrocatechol. The bacterium tolerated moderate concentrations of p-nitrophenol (up to 0.5 mM) and degraded it under light at an optimal O2 pressure of 20 kPa. The bacterium did not metabolize the xenobiotic in the dark or under strictly anoxic conditions or high O2 pressure. Bacterial growth with acetate in the presence of p-nitrophenol took place with the simultaneous release of nonstoichiometric amounts of 4-nitrocatechol, which can also be degraded by the bacterium. Crude extracts from R. capsulatus produced 4-nitrocatechol from p-nitrophenol upon the addition of NAD(P)H, although at a very low rate. A constitutive catechol 1,2-dioxygenase activity yielding cis,cis-muconate was also detected in crude extracts of R. capsulatus. Further degradation of 4-nitrocatechol included both nitrite- and CO2-releasing steps since: (1) a strain of R. capsulatus (B10) unable to assimilate nitrate and nitrite released nitrite into the medium when grown with p-nitrophenol or 4-nitrocatechol, and the nitrite concentration was stoichiometric with the 4-nitrocatechol degraded, and (2) cultures of R. capsulatus growing microaerobically produced low amounts of 14CO2 from radiolabeled p-nitrophenol. The radioactivity was also incorporated into cellular compounds from cells grown with uniformly labeled 14C-p-nitrophenol. From these results we concluded that the xenobiotic is used as a carbon source by R. capsulatus, but that only the strain able to assimilate nitrite (E1F1) can use p-nitrophenol as a nitrogen source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050538
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  • 8
    Electronic Resource
    Electronic Resource
    New tetra- and pentacoordinate nickel(I) complexes (1977)
    Springer
    Transition metal chemistry 2 (1977), S. 130-132 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The reduction of nickel(II) halides with NaBH4 in ethanol has been studied in the presence of various tertiary phosphines and arsines. Complexes of the type XNiL3 have been isolated in this way when X = Cl, Br, I and L = PPh3, AsPh3, no reaction being observed when L = PEt3, PBu3 and Ph2P(CH2)2PPh2. The reaction of XNiL3 with CO gas at room temperature produces pentacoordinate carbonyl complexes XNi(CO)2L2 when L is triphenylphosphine. The lack of stability prevents the isolation of similar complexes when L is trip henylarsine. Structural data obtained by i.r. spectroscopy and susceptibility measurements as well as chemical behaviour of the new complexes are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402703
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of aminoacids on the surface free energy of nitrofurantoin (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 688-695 
    Details
    ISSN: 1435-1536
    Keywords: Nitrofurantoin ; surface free energy ; effect of aminoacids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Changes in nitrofurantoin surface free energy components, Lifshitz-van der Waals, γ s LW , electron donor, γ s − , and electron acceptor, γ s + , due to adsorption of the aminoacids: lysine, alanine and glutamic acid, were determined by means of the thin-layer wicking technique. It was found that the aminoacids slightly increase the γ s − component already at 10−4 M concentration. They reduce the γ s + component practically to zero, and a very sharp increase of γ s − was observed when the nitrofurantoin surface was precovered from the solutions at concentrations larger tan 10−4 M. It is concluded that the adsorption of the aminoacids takes place via hydrogen bonding and electrostatic interactions between nitrofurantoin surface and aminoacid molecules. The increase in the γ s − parameter is probably caused by the presence of carboxyl groups in the aminoacid molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652831
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  • 10
    Electronic Resource
    Electronic Resource
    Case Report: Perindopril-Induced Acute Pancreatitis (1997)
    Springer
    Digestive diseases and sciences 42 (1997), S. 1789-1791 
    Details
    ISSN: 1573-2568
    Keywords: ACE INHIBITORS ; PERINDOPRIL ; PANCREATITIS ; RECHALLENGE TEST
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018838204781
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