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  • 1
    Electronic Resource
    Electronic Resource
    Binary ion exchange equilibrium for Ca2+, Mg2+, K+, Na+ and H+ ions on amberlite IR-120 (1993)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 16 (1993), S. 35-39 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Experimental data are reported for ion exchange equilibria of binary systems on Amberlite IR-120 resin, at different temperatures and total ionic concentrations in aqueous solutions. These systems exhibit non-ideal behaviour in both phases, and the equilibrium characterization has been based on the law of mass action, using Wilson and Meisssner, and Kusik equations to correlate the activity coefficients in the resin and aqueous solutions, respectively. Equilibrium constants, standard thermodynamic properties (Gibbs free enthalpy changes, enthalpy and entropy) and Wilson binary parameters were obtained as functions of temperature.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270160107
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new pneumatic bearing dynamometer for power input measurement in stirred tanks (1991)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 14 (1991), S. 105-108 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A turntable dynamometer has been constructed for the accurate measurement of power input and mixing applications in bench stirred tank reactors. The main feature of this device is a pneumatic bearing with complementary conical parts. The conical pneumatic bearing permitted to apply eccentric loads without affecting its stability. The static friction torque in the pneumatic bearing was very small, 4 × 10-4 Nm, and can be neglected in the experimental ranges of measured torques, i.e. from 5 × 10-3 to 2.21 Nm. In accordance with the instrumentation used, the deviations obtained with the apparatus are less than 10% at low torque readings. At moderate torques, deviations lower than 1% are routinely obtained. Several power input measurements show that the obtained data scatter is lower than 2.5%. The power input response in the turbulent regime is in agreement with dimensional analysis: the power input depends on the cube of the impeller speed. In addition, data obtained with a turbine impeller under ungassed conditions agree with the predictions of a published correlation, which takes into account several geometrical parameters.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270140206
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic study of the synthesis of n-octyl octanoate using cobalt chloride as catalyst (1994)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 210-215 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The kinetics of the pseudohomogeneous liquid phase synthesis of a high molecular weight ester in a stirred tank reactor using cobalt chloride as catalyst has been studied at various temperatures, catalyst concentrations, and acid/alcohol molar ratios. A kinetic model has been determined that predicts the experimental results quite well.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270170310
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  • 4
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    Hair analysis (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-11-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez, F -- Poet, T S -- Watson, R R -- New York, N.Y. -- Science. 1990 Nov 23;250(4984):1070.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2251495" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cocaine/metabolism/pharmacokinetics ; Hair/*chemistry/metabolism ; Humans ; Male ; Mice ; Morphine/metabolism/pharmacokinetics ; *Substance Abuse Detection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Cross-regulatory interactions between the proneural achaete and scute genes of Drosophila (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-03-22
    Description: The achaete (ac) and scute (sc) genes of Drosophila allow cells to become sensory organ mother cells. Although ac and sc have similar patterns of expression, deletion of either gene removes specific subsets of sensory organs. This specificity was shown to reside in the peculiar regulation of ac and sc expression. These genes are first activated in complementary spatial domains in response to different cis-regulatory sequences. Each gene product then stimulates expression of the other gene, thus generating similar patterns of expression. Therefore, removal of one gene leads to the absence of both proneural gene products and sensory organs in the sites specified by its cis-regulatory sequences.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martinez, C -- Modolell, J -- New York, N.Y. -- Science. 1991 Mar 22;251(5000):1485-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centro de Biologia Molecular, Consejo Superior de Investigaciones Cientificas, Universidad Autonoma de Madrid, Spain.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1900954" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila melanogaster/embryology/*genetics ; Gene Expression Regulation ; Nervous System/*embryology ; Promoter Regions, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    A wingless-dependent polar coordinate system in Drosophila imaginal discs (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-01-22
    Description: The patterning of the imaginal discs in Drosophila melanogaster is a progressive process that, like the patterning of the larval epidermis during embryogenesis, requires the activity of segment polarity genes. One segment polarity gene, wingless, encodes a homolog of the mouse proto-oncogene Wnt-1 and plays a prominent role in the patterning of the larval epidermis and the imaginal discs. However, whereas the function of wingless in the embryo is initially associated with a pattern of stripes along the anteroposterior axis that are part of a Cartesian coordinate system, it is shown here that during imaginal development wingless is associated with a pattern of sectors that provide references for a polar coordinate system homologous to that postulated in a well-known model for the regeneration of insect and vertebrate limbs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Couso, J P -- Bate, M -- Martinez-Arias, A -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 1993 Jan 22;259(5094):484-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Zoology, University of Cambridge, United Kingdom.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8424170" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Drosophila melanogaster/embryology/*genetics/growth & development ; Embryo, Nonmammalian/cytology/physiology ; Gene Expression ; Larva ; Mice ; Phenotype ; Protein-Tyrosine Kinases/genetics ; Proto-Oncogene Proteins/genetics ; Proto-Oncogenes ; Sequence Homology, Nucleic Acid ; Wings, Animal ; Wnt Proteins ; Wnt1 Protein ; *Zebrafish Proteins ; beta-Galactosidase/genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    The embryonic vertebrate forebrain: the prosomeric model (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-10-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rubenstein, J L -- Martinez, S -- Shimamura, K -- Puelles, L -- MH01046-01/MH/NIMH NIH HHS/ -- MH49428-01/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1994 Oct 28;266(5185):578-80.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nina Ireland Laboratory of Developmental Neurobiology, University of California, San Francisco 94143-0984.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7939711" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Central Nervous System/embryology ; Diencephalon/embryology ; Embryonic and Fetal Development ; Gene Expression Regulation, Developmental ; Genes, Homeobox ; Genes, Regulator ; *Models, Biological ; Morphogenesis ; Prosencephalon/*embryology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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