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  • 1985-1989  (5)
  • 1970-1974
  • 1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Employment, schooling and productivity growth (1989)
    Springer
    De economist 137 (1989), S. 425-453 
    Details
    ISSN: 1572-9982
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary This paper presents an empirical analysis of labour demand and labour productivity growth in The Netherlands. Assuming an aggregate production function with as factors capital and 3 types of labour, distinguished by educational attainment, cost minimization leads to a set of 3 labour demand relations to be estimated on time series data. Using the estimates and the implied elasticities, aggregate labour productivity growth is decomposed into factor substitution, autonomous factors, labour time shortening, economies of scale, utilization rates and the increased educational level of the working population. The contributions of substitution, utilization rates and education appear to be substantial, notably in the seventies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705974
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The innervation of the corpus cardiacum of Locusta migratoria: A neuroanatomical study with the use of Lucifer yellow (1989)
    Springer
    Cell & tissue research 258 (1989), S. 301-308 
    Details
    ISSN: 1432-0878
    Keywords: Corpus cardiacum ; Neuroanatomical tracing ; Lucifer yellow ; Locusta migratoria (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neural connections of the corpus cardiacum (CC) in the African locust, Locusta migratoria, were labelled with the fluorescent tracer Lucifer yellow. (1) Unilateral anterograde labelling of the nervus corporis cardiaci I revealed fluorescent fibres in the storage lobe of the CC (CCS). Some fluorescent fibres in the CCS closely approached the ipsilateral border of the glandular lobes of the CC (CCG). Fluorescent fibres also projected into the neuropile of the hypocerebral ganglion via the ipsilateral nervi cardiostomatogastrici I and II, and from there into the oesophageal nerves. (2) Unilateral anterograde labelling of the nervus corporis cardiaci II revealed fluorescent fibres in the CCS and in the ipsilateral CCG. Fluorescent fibres also projected via the ipsilateral nervus corporis allati I into the corpus allatum. (3) Unilateral retrograde labelling of the nervus corporis allati I revealed a distinct fluorescent nerve tract that runs through the CCS and into the nervus corporis cardiaci II. The tract arises from about eight cell bodies in the brain at the rostroventral side of the ipsilateral calyx of the mushroom body. (4) Labelling of the recurrent nerve revealed fluorescent fibres and some fluorescent cell bodies in the hypocerebral ganglion and, via the nervi cardiostomatogastrici I and II, also in the CCS. Fluorescent fibres were also present in the oesophageal nerves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239450
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructural enzyme-cytochemical study of the intrinsic glandular cells in the corpus cardiacum of Locusta migratoria: relation to the secretory and endocytotic pathways, and to the lysosomal system (1989)
    Springer
    Cell & tissue research 255 (1989), S. 167-178 
    Details
    ISSN: 1432-0878
    Keywords: Secretion ; Endocytosis ; Autophagy ; Corpus cardiacum ; Locusta migratoria (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Ultrastructural aspects of the secretory and the endocytotic pathways and the lysosomal system of corpus cardiacum glandular cells (CCG cells) of migratory locusts were studied using morphological, marker enzyme, immunocytochemical and tracer techniques. It is concluded that (1) the distribution of marker enzymes of trans Golgi cisternae and trans Golgi network (TGN) in locust CCG cells corresponds to that in most non-stimulated vertebrate secretory cell types; (2) the acid phosphatase-positive TGN in CCG cells is involved in sorting and packaging of secretory material and lysosomal enzymes; (3) these latter substances are produced continuously; (4) at the same time, superfluous secretory granules and other “old” cell organelles are degraded; (5) the remarkable endocytotic activity in the cell bodies and the minor endocytotic activity in cell processes are coupled mainly to constitutive uptake of nutritional and/or regulatory (macro)molecules, rather than to exocytosis; (6) plasma membrane recycling occurs mainly by direct fusion of tubular endosomal structures with the plasma membrane and little traffic passes the Golgi/TGN; and (7) so-called cytosomes arise mainly from autophagocytotic vacuoles and represent a special kind of complex secondary lysosomes involved in the final degradation of endogenous (cell organelles) and exogenous material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229078
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  • 4
    Electronic Resource
    Electronic Resource
    Prevalence of enterotoxigenicEscherichia coli strains in outbreaks and sporadic cases of diarrhoea in Spain (1989)
    Springer
    European journal of clinical microbiology & infectious diseases 8 (1989), S. 396-400 
    Details
    ISSN: 1435-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Escherichia coli strains isolated 1985–1988 in Spain from patients with diarrhoea were examined; 1170 strains were isolated from 582 sporadic cases of diarrhoea in children, and seven strains were associated with seven outbreaks of diarrhoea. Strains positive for STa enterotoxin production in the infant mouse test were also assayed for production of LT enterotoxin on Vero cells and by a coagglutination test. Thirty-one strains were STa positive: 28 were isolated from 16 (2.7 %) sporadic cases of diarrhoea and three were responsible for outbreaks. The majority of STa+LT− strains from both outbreaks and sporadic cases were serotype O153.H45 and expressed the CFA/I colonization factor antigen. Enterotoxigenic STa+LT− strains of serotype O27:H7 and STa+LT+ CFA/II+ strains of serotype O6:H15: H16 were also isolated frequently from sporadic cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964054
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Produkte der Reaktion von Ethylbromid mit Kaliumhydroxid in wäßrig-alkoholischen Lösungen und den Verlauf dieser SN2-Reaktion (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 709-720 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Products of the Reaction of Ethyl Bromide and Potassium Hydroxide in Aqueous Alcoholic Solutions and the Progress of this SN2 ReactionIn the textbooks of organic and general chemistry the reactions of ethyl bromide or methyl bromide with hydroxide ions in alcoholic or aqueous-alcoholic solutions are the main examples for the SN2 reaction mechanism first established by INGOLD and HUGHES in 1933-1935.It seems clear that the main product of the reaction between ethyl bromide and potassium hydroxide is ethanol apart from a small proportion of ethene in the competing elimination reaction. But the main product of this reaction in ethanolic or aqueous ethanolic solution is diethyl ether or in methanolic or aqueous methanolic solution methyl ethyl ether. Even in the case of using only water, potassium hydroxide and ethyl bromide one can gain 17% of diethyl ether. Kinetic investigations demonstrate that there is a real equilibrium between ethoxide and hydroxide ions in aqueous ethanolic solution. The equilibrium constant is near 0.5, that means that a mixture of ethanol and water contains a rather high amount of ethoxide ions if potassium hydroxide is dissolved in the solution. On the other hand, in the substitution reaction ethoxide ions react 2.5 times faster than OH⊖ at 20°C and 4.5 times faster at 100°C. Therefore, the main substitution reaction in aqueous ethanolic solution after formation of ethoxide ions according to the equilibrium is the reaction to diethyl ether according to
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310502
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