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  • 1
    Electronic Resource
    Electronic Resource
    Generalized Mixed Variational Inequalities and Resolvent Equations (1997)
    Springer
    Positivity 1 (1997), S. 145-154 
    Details
    ISSN: 1572-9281
    Keywords: iterative algorithm ; resolvent equations ; variational inequalities
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we introduce and study a new class of variational inequalities, which is called the generalized mixed variational inequality. Using essentially the resolvent operator concept, we establish the equivalence between the generalized mixed variational inequalities and the system of resolvent equations. This equivalence is used to suggest a number of new iterative algorithms for solving the variational inequalities. Several special cases are discussed which can be obtained from the main results of this paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009741519357
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  • 2
    Electronic Resource
    Electronic Resource
    Electrocatalytic oxidation of hydrazine at cobalt hexacyanoferrate- modified glassy carbon, Pt and Au electrodes (1998)
    Springer
    Journal of solid state electrochemistry 2 (1998), S. 30-37 
    Details
    ISSN: 1433-0768
    Keywords: Key words Electrocatalysis ; Hydrazine ; Cobalt hexacyanoferrate ; Modified electrodes ; Glassy carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrocatalytic oxidation of hydrazine has been studied on glassy carbon, Pt and Au electrodes modified by cobalt hexacyanoferrate (CoHCF) using cyclic voltammetry and rotating disc techniques. It has been shown that the oxidation of hydrazine to nitrogen occurs at the potential coinciding with that of Co(II) to Co(III) transformation in a CoHCF film, where no oxidation signal is observed at a bare glassy carbon electrode. A Tafel plot, derived from RDE voltammograms, exhibits a slope of 150 mV, indicating a one-electron charge transfer process to be the rate-limiting step. The electrocatalytic efficiency of the modified electrode towards hydrazine oxidation depends on solution pH, and the optimum range was found to be located between pH 5 and pH 7. The kinetic behaviour and location of the electrocatalytic process were examined using the W.J. Albery diagnosis table, and it was concluded that the reaction has either a “surface” or a “layer” reaction mechanism. Pt- and Au-CoHCF-modified electrodes show no significant electrocatalytic activity towards hydrazine oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050061
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  • 3
    Electronic Resource
    Electronic Resource
    Transfection, expression, and DNA sequence of a gene encoding a BoLA-A11 antigen (1995)
    Springer
    Immunogenetics 41 (1995), S. 246-250 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172066
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  • 4
    Electronic Resource
    Electronic Resource
    DNA polymorphisms and linkage disequilibrium in the angiotensinogen gene (1996)
    Springer
    Human genetics 〈Berlin〉 98 (1996), S. 194-198 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A number of recent studies have implicated the angiotensinogen gene in the aetiology of essential hypertension in Caucasian, Japanese and African Caribbean subjects. We have genotyped 153 healthy white Caucasian subjects at a dinucleotide repeat polymorphism and seven diallelic sites in the coding or flanking regions of the angiotensinogen gene, including one polymorphism not previously studied. We have also documented patterns of linkage disequilibrium between polymorphisms. There is evidence of variation in the frequency of several mutations when compared with published results from other Caucasian control populations, possibly due to cryptic ethnic differences between these groups. This should be considered in the design and interpretation of studies of the angiotensinogen gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004390050189
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  • 5
    Electronic Resource
    Electronic Resource
    Sol-Gel Derived Thin Films for Hydrogen Sulphide Gas Sensing (1998)
    Springer
    Journal of sol gel science and technology 11 (1998), S. 177-183 
    Details
    ISSN: 1573-4846
    Keywords: sensors applications ; doped sol-gel ; hydrogen sulphide sensing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Utilizing the sol-gel fabrication route, we have successfully modified and tailored the optical absorption in the visible spectrum of thionine dye trapped in an MTMS gel-matrix to coincide with the emission of a red diode laser operating at 660 nm. These thionine-doped MTMS thin films coated onto transparent substrates have shown a remarkable change in optical absorption in the presence of gaseous hydrogen sulphide (H2S) diluted in air and in the absence of any buffer gas. The rapid response, sensitivity, reversibility and durability shown by this material can be exploited in developing absorption-based optical H2S sensors in either an integrated optics or all-optical fiber approach using a red diode laser source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008649631712
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  • 6
    Electronic Resource
    Electronic Resource
    Oil palm (Elaeis guineensis) protoplasts: isolation, culture and microcallus formation (1996)
    Springer
    Plant cell, tissue and organ culture 46 (1996), S. 35-41 
    Details
    ISSN: 1573-5044
    Keywords: Elaeis guineensis ; oil palm ; protoplasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Procedures are deseribed for the efficient isolation of protoplasts from a variety of oil palm (Elaeis guineensis Jacq.) tissues. Various factors including donor source, composition of enzyme mixture and culture medium affected the yield and viability of the protoplasts Polyembryogenic cultures of oil palm were the most suitable starting material in terms of yield, viability and metabolic competence. Pectolyase Y-23 in association with cellulase and hemicellulase was required for the efficient release of protoplasts from the oil palm tissues. Limited cell division to form microcallus was observed at very low frequency (〈0.01%) when glutathione and catalase were incorporated in the culture medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039694
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  • 7
    Electronic Resource
    Electronic Resource
    Mutation and evolution of microsatellites in Drosophila melanogaster (1998)
    Springer
    Genetica 102-103 (1998), S. 359-367 
    Details
    ISSN: 1573-6857
    Keywords: Drosophila ; microsatellites ; mutation rate ; recombination ; gvariation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Levels of nucleotide polymorphism in the Drosophila melanogaster genome are correlated with rates of recombination. This relationship may be due to hitchhiking of advantageous mutations (selective sweeps) or to continual removal of deleterious mutations from the genome (background selection). One test of the relative contributions of selective sweeps and background selection to the observed levels of variation in the genome of D. melanogaster is to compare levels of nucleotide variability (with a mutation rate on the order of 10-9 per nucleotide per generation) with more rapidly evolving DNA loci such as microsatellites. This test depends critically on details of the mutational process of microsatellites. In this paper, we summarize our studies of microsatellite characteristics and mutation rates in D. melanogaster. We find that D. melanogaster microsatellites are short and have a mutation rate (6.5 × 10-6 per locus per generation) several orders of magnitude lower than mammals studied to date. We further show that genetic variation at 18 dinucleotide repeat microsatellites in a population of D. melanogaster from Maryland is correlated with regional rates of recombination. These and other microsatellite data suggest that both background selection and selective sweeps may contribute to the correlation between DNA sequence variation and recombination in Drosophila.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017083025154
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  • 8
    Electronic Resource
    Electronic Resource
    Nonconvex functions and variational inequalities (1995)
    Springer
    Journal of optimization theory and applications 87 (1995), S. 615-630 
    Details
    ISSN: 1573-2878
    Keywords: Nonconvex functions ; semipreinvex functions ; semi-invex sets ; variational-like inequalities ; iterative algorithms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we study some properties of a class of nonconvex functions, called semipreinvex functions, which includes the classes of preinvex functions and arc-connected convex functions. It is shown that the minimum of an arcwise directionally differentiable semi-invex functions on a semi-invex set can be characterized by a class of variational inequalities, known as variational-like inequalities. We use the auxiliary principle technique to prove the existence of a solution of a variational-like inequality and suggest a novel iterative algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02192137
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  • 9
    Electronic Resource
    Electronic Resource
    Extraction of Pd(II) ions using tri-n-octylamine xylene base supported liquid membranes (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 218 (1997), S. 53-60 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Membranes, based on tri-n-octylamine (TOA) xylene liquid, supported in hydrophobic microporous films have been used to study the transport of Pd(II) ions, after extraction into the membrane. Various parameters, such as the effect of hydrochloric acid concentration in the feed solution, TOA concentration in the membrane phase, effect of stripping agent like nitric acid concentration, and temperature on the flux of Pd(II) ions across the liquid membranes have been investigated. The optimum conditions of transport for these metal ions determined are, TOA concentration, 1.25 mol·dm−3, HCl concentration in the feed solution, 5 mol·dm−3, and concentration of nitric acid used as a stripping, agent 5 mol·dm−3. The maximum values of the flux and permeability determined under the optimum condition are 23·10−6 mol·m−2·s−1 and 2.40·103 m2·s−1 at 25°C. The results obtained have been used to elucidate the mechanism of palladium transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02033973
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  • 10
    Electronic Resource
    Electronic Resource
    On compact multipliers of topological algebras (1996)
    Springer
    Periodica mathematica Hungarica 32 (1996), S. 209-212 
    Details
    ISSN: 1588-2829
    Keywords: Primary 46J05 ; Secondary 47B07 ; 47B38 ; Key words and phrases ; B0-algebras ; Fréchet algebras ; semisimplicity ; maximal ideal spaces ; compact multipliers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract It is shown that if the maximal ideal space Δ(A) of a semisimple commutative complete metrizable locally convex algebra contains no isolated points, then every compact multiplies is trivial. In particular, compact multipliers on semisimple commutative Fréchet algebras whose maximal ideal space has no isolated points are identically zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02109790
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