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  • 1
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    Catalyse de la réaction de Michael par le fluorure de potassium supporté sur le phosphate naturel (1999)
    Elsevier
    Details
    Publication Date: 1999-08-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    A co-activator of nitrogen-regulated transcription in Saccharomyces cerevisiae (1999)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 31 (1999), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: In Saccharomyces cerevisiae, the transcription factors Gln3p and Nil1p of the GATA family play a determinant role in expression of genes that are subject to nitrogen catabolite repression. Here we report the isolation of a new yeast mutant, gan1-1, exhibiting dramatically decreased NAD-linked glutamate dehydrogenase (NAD-GDH) and glutamine synthetase (GS) activities. The GAN1 gene was cloned and found to encode a 488-amino-acid polypeptide bearing no typical DNA binding domain. Gan1p is required for full expression of GLN1, GDH2 and also other nitrogen utilization genes, including GAP1, PUT4, MEP2 and GDH1. The extent to which Gan1p is required, however, varies according to the gene and to the nitrogen source available. We show that Gan1p is in fact involved in Gln3p- and Nil1p-dependent transcription. In the case of Gln3p-dependent transcription, the degree to which Gan1p is required appears to be gene specific. The contribution of Gan1p to gene expression is also influenced by the nitrogen status of the cell. We found that GAN1 is identical to ADA1, which encodes a component of the ADA/GCN5 co-activator complex. Ada1/Gan1p thus represents the first reported case of an accessory protein (a co-activator) linking the GATA-binding proteins Gln3p and Nil1p, mediating nitrogen-regulated transcription, to the basal transcription machinery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1999.01187.x
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  • 3
    Electronic Resource
    Electronic Resource
    Heat transfer characteristics of pulsated turbulent pipe flow (1999)
    Springer
    Heat and mass transfer 34 (1999), S. 413-421 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Heat Transfer characteristics of pulsated turbulent pipe flow under different conditions of pulsation frequency, amplitude and Reynolds number were experimentally investigated. The pipe wall was kept at uniform heat flux. Reynolds number was varied from 5000 to 29 000 while frequency of pulsation ranged from 1 to 8 Hz. The results show an enhancement in the local Nusselt number at the entrance region. The rate of enhancement decreased as Re increased. Reduction of heat transfer coefficient was observed at higher frequencies and the effect of pulsation is found to be significant at high Reynolds number. It can be concluded that the effect of pulsation on the mean Nusselt numbers is insignificant at low values of Reynolds number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050277
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  • 4
    Electronic Resource
    Electronic Resource
    Average Nusselt number correlation in the thermal entrance region of steady and pulsating turbulent pipe flows (1999)
    Springer
    Heat and mass transfer 35 (1999), S. 377-381 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Empirical correlation has been developed for local and average Nusselt numbers in the thermal entrance region of steady and pulsating turbulent air-flows in a pipe. The correlation was based on experimental data obtained from experiment carried out on a pipe heated under uniform heat flux conditions. The rate of flow was periodically varied at frequencies ranging from 1 Hz to 13 Hz while the average Reynolds number varied from 6400 to 42000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050339
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  • 5
    Electronic Resource
    Electronic Resource
    Friedel-Crafts Acylation of 2(3H)-Benzoxazolone: Investigation of the Role of the Catalyst and Microwave Activation (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 1393-1397 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. 2(3H)-Benzoxazolone; Friedel-Crafts reaction; AlCl3-DMF complex; Microwave irradiation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Im Zuge der Untersuchung komplexierter Spezies von AlCl3 im Rahmen von Friedel-Crafts-Reaktionen wurde die Acetylierung und Benzoylierung von 2(3H)-Benzoxazolon und 1-Methyl-2(3H)-benzoxazolon unter Variation des komplexierenden Amidagens untersucht. Es wurde dabei Dimethylformamid durch N-Methylformamid, Dimethylacetamid, Pyrrolidon, N-Methylpyrrolidon, Tetramethylharnstoff oder Dimethylsulfoxid ersetzt; es konnten jedoch keine Vorteile gegenüber Dimethylformamid beobachtet werden. Dieses Resultat beruht vermutlich darauf, daß der Komplex zwischen AlCl3 und diesen Amiden zu stabil ist. Darüber hinaus wurde auch die Möglichkeit, Polyphosphorsäure und Mikrowellenaktivierung einzusetzen, untersucht. Der besondere Vorteil liegt hiebei in den guten Ausbeuten, die bei relativ kurzen Reaktionszeiten erzielt werden können.
    Notes: Summary.  To study the scope and limitations of the use of complexed species of AlCl3 in Friedel-Crafts reactions, we investigated the acetylation and benzoylation of 2(3H)-benzoxazolone and 3-methyl-2(3H)-benzoxazolone varying the amide complexing agent. We replaced dimethylformamide by N-methylformamide, dimethylacetamide, pyrrolidone, N-methylpyrrolidone, tetramethylurea, and dimethylsulfoxide. However, there was no particular advantage of substituting dimethylformamide by another amide ligand. This can probably be ascribed to the fact that the complex formed between AlCl3 and the complexing agent becomes too stable. Alternatively, a route using polyphosphoric acid and microwave activation was explored. The major advantage of running the reaction in a microwave oven was that a good yield was reached in a rather short period of time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010199
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  • 6
    Electronic Resource
    Electronic Resource
    A heptacoordinated mononuclear diphenylantimony carboxylate (1999)
    Springer
    Journal of chemical crystallography 29 (1999), S. 1103-1106 
    Details
    ISSN: 1572-8854
    Keywords: antimony(V) ; mononuclear carboxylate ; heptacoordinated, structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The X-ray structure of a novel mononuclear heptacoordinated compound chlorodiphenylantimony(V) bis(2-methyl benzoate), SbPh2CI(O2C—2—Me—C6H4)2 is described. Crystal data are: Monoclinic, P21/c, a = 8.791(3), b = 21.687(3), c = 13.488(4) Å, β = 103.78(2)°, and Z = 4. A distorted pentagonal bipyramidal geometry for antimony with both the carboxylates chelating is found in the solid state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009505724312
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  • 7
    Electronic Resource
    Electronic Resource
    Change of Variable Method for Generalized Complementarity Problems (1999)
    Springer
    Journal of optimization theory and applications 100 (1999), S. 389-395 
    Details
    ISSN: 1573-2878
    Keywords: Complementarity problems ; change of variables ; algorithms ; fixed points ; convergence ; Wiener–Hopf equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we establish an equivalence between the generalized complementarity problems and the Wiener–Hopf equations by using a change of variables technique. This equivalence is used to suggest and analyze a number of iterative algorithms for solving the generalized complementarity problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021790404792
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  • 8
    Electronic Resource
    Electronic Resource
    Wiener–Hopf Equations Technique for Quasimonotone Variational Inequalities (1999)
    Springer
    Journal of optimization theory and applications 103 (1999), S. 705-714 
    Details
    ISSN: 1573-2878
    Keywords: Variational inequalities ; Wiener–Hopf equations ; iterative methods ; convergence criteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we use the Wiener–Hopf equations technique to suggest and analyze new iterative methods for solving general quasimonotone variational inequalities. These new methods differ from previous known methods for solving variational inequalities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021796326831
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  • 9
    Electronic Resource
    Electronic Resource
    Fixation of radioactive isotopes on bentonite as radioactive waste treatment step (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 241 (1999), S. 643-645 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Fixation of137Cs,144Ce,60Co,90Sr,240Th and233U from aqueous and phosphate media on bentonite clay was studied. The fixation of the radioactive ions on bentonite surfaces was dependent on the pH behavior of the metal ions. A method was proposed to use bentonite as an absorbent of ions from simulated radioactive waste as a treatment step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347225
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  • 10
    Electronic Resource
    Electronic Resource
    Identification of quantitative trait loci for nitrogen use efficiency in maize (1999)
    Springer
    Molecular breeding 5 (1999), S. 187-195 
    Details
    ISSN: 1572-9788
    Keywords: gene mapping ; low nitrogen tolerance ; nitrogen use efficiency ; RFLP ; Zea mays L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Intensively managed crop systems are normally dependent on nitrogen input to maximize yield potential. Improvements in nitrogen- use efficiency (NUE) in crop plants may support the development of cropping systems that are more economically efficient and environment friendly. The objective of this study was to map and characterize quantitative trait loci (QTL) for NUE in a maize population. In preliminary experiments, inbred lines contrasting for NUE were identified and were used to generate populations of F2:3 families for genetic study. A total of 214 F2:3 families were evaluated in replicated trials under high nitrogen (280 kg/ha) and low nitrogen (30 kg/ha) conditions in 1996 and 1997. Analysis of ear-leaf area, plant height, grain yield, ears per plant, kernels number per ear, and kernel weight indicated significant genetic variation among F2:3 families. The heritability of these traits was found to be high (h2=0.57–0.81). The mapping population were genotyped using a set of 99 restriction fragment length polymorphism (RFLP) markers. A linkage map of these markers was developed and used to identify QTL. Between two and six loci were found to be associated with each trait. The correspondence of several genomic regions with traits measured under nitrogen limited conditions suggests the presence of QTL associated with NUE. QTLs will help breeders to improve their maize ideotype of a low-nitrogen efficiency by identifying those constitutive and adaptive traits involved in the expression of traits significantly correlated with yield, such as ear leaf area and number of ears per plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009669507144
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