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  • Digitale Medien  (19)
  • 1980-1984  (11)
  • 1960-1964  (8)
  • 1
    Digitale Medien
    Digitale Medien
    Antibodies to hen and duck antigens in poultry workers (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical & experimental allergy 14 (1984), S. 0 
    Details
    ISSN: 1365-2222
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Serum antibodies to avian and Aspergillus antigens were detected by enzyme-linked immunosorbent assays (ELISA) in forty-two workers from a poultry abattoir and in twenty healthy blood donors. The levels of IgG and IgA antibodies to hen and duck serum were significantly higher in poultry workers than in blood donors (P〈0.01). In workers employed for less than 1 year the antibody levels were lower than in those who had been employed for a longer period of time (P〈0.05). The IgA antibody level to a high molecular weight Aspergillus antigen was higher in poultry workers than blood donors (P〈0-05), whereas the level of other Aspergillus antibodies were similar in the two groups. The level of IgG antibodies to hen antigen was higher in non-smokers than in smokers (P〈0-02). A correlation between the antibody levels to hen and duck antigens and to pigeon antigen was found (P〈0.05). indicating cross-reactivity between these antibodies. No cases of allergic alveolitis were found, and no correlation between antibody levels and respiratory symptoms could be demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2222.1984.tb02225.x
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  • 2
    Digitale Medien
    Digitale Medien
    On universal 22 (1982)
    Cambridge : Cambridge University Press
    Journal of linguistics 18 (1982), S. 231-243 
    Details
    ISSN: 0022-2267
    Quelle: Cambridge Journals Digital Archives
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen
    Notizen: Greenberg's pioneering work on word order universals (Greenberg, 1966) in which he proposed a total of universals concerning the ‘order of meaningful elements’ as well as a typology based on this order distinguishing 24 language types has truly had a great influence on linguistic research in the past few years. Not only has this important contribution to our understanding of language universals and typology precipitated such widespread interest in this particular field of linguistics which has culminated in a number of language specific monographs (see for instance Heine, 1976; Lehmann, 1974; Friedrich, 1975); symposia (see Li, 1975, 1976, 1977) and even larger projects (for example the Language Universals Project of Stanford University, and the Cologne project on language universals, see Greenberg, 1978; Seiler, 1973, 1978), but it also has influenced linguistics in general to such an extent that many consider syntactic description and research to be incomplete without a thorough discussion of word order, in some cases to the virtual exclusion of other topics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1017/S0022226700013591
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of root anaerobiosis on the water relations of several Pyrus species (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 62 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Solution culture experiments were designed to investigate the plant water relations of 3 Pyrus species subjected to root anaerobiosis. Root anaerobiosis induced partial stomatal closure prior to alterations in leaf water potential (ΨLW) or root osmotic potential (ΨRπ). In contrast, stomatal closure was accompanied by a decline in root hydraulic conductivity (Lp). Anoxia markedly reduced ΨLW for Pyrus communis L. and eventually led to wilting and defoliation. Pyrus betulaefolia Bunge and Pyrus calleryana Decne, however, were less affected by root anaerobiosis. To delineate if the increased root resistance was in the radial or longitudinal direction, 10−4M cistrans abscisic acid (ABA) was added to detopped root systems of P. communis in solution culture after steady-state rates of Lp were established. A consistent 25 to 30% promotion of Lp was observed 1.5 h after the addition of ABA for aerobically treated plants. ABA did not influence Lp when applied to roots previously deprived of O2 for 4 days. Additional evidence against the limiting resistance being in the radial direction was obtained when water fluxes were compared through intact P. communis roots, roots with all feeder roots detached, and stems without root systems. Severing feeder roots from anaerobically treated plants did not increase water flux to rates observed for aerobically treated plants. Resistance progressed basipetally to eventually encompass the stem itself. These results can only be explained by occlusion of the xylem vessels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb00378.x
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  • 4
    Digitale Medien
    Digitale Medien
    Water and ion fluxes of abscisic acid-treated root systems of pear, Pyrus communis (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 60 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Water and ion fluxes of intact root systems of Pyrus communis L. cv. Old Home × Farmingdale 97 immersed in a nutrient solution were determined at various pressures and temperatures. Water flux (Jv was normalized on the basis of initial flow rates of a root system after 30 min at 0.50 MPa and 25°C, expressed as the ratio Qv. Qv responded linearly to pressures between 0.20 and 0.62 MPa, implying a constant root hydraulic conductivity (Lp) within this range. Similarly Qv was linearly related to temperatures between 7 and 35°C; however, large, rapid temperature changes resulted in a break of the Arrhenius plot of Qv versus the reciprocal of temperature, Abscisic acid (ABA) from 2 × 10−6 to 10−4M, applied to intact root systems, increased Qv within 10–20 min, with the effect leveling off after 1.5 h. At a pressure of 0.50 MPa, ABA at 10-4M enhanced Qv by 28%. The stimulation of Qv was not due to the ethanol solvent since 0.13 or 1.33% ethanol decreased Qv-, The osmotic potential of the xylem fluid was determined and was used to calculate total normalized solute flux. The results suggest that ABA-induced or ethano1-induced changes in Qv were mainly due to changes in Lp and not to changes in ion transport to the xylem.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb04555.x
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  • 5
    Digitale Medien
    Digitale Medien
    Radiologic manifestations in alcaptonuria (1984)
    Springer
    Skeletal radiology 11 (1984), S. 204-208 
    Details
    ISSN: 1432-2161
    Schlagwort(e): Alcaptonuria ; Ochronotic arthropathy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Alcaptonuria is a rare, hereditary disorder of amino acid metabolism, secondary to lack of homogentisic acid oxydase. As a consequence, there is ex accumulation of homogentisic acid, which is excreted in the urine and deposited in the connective tissues. This deposition results in ochronotic pigmentation and arthropathy, of which some characteristic radiological findings are demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00349495
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  • 6
    Digitale Medien
    Digitale Medien
    Distribution of GABA sensitive areas on hippocampal pyramidal cells (1982)
    Springer
    Experimental brain research 45 (1982), S. 357-363 
    Details
    ISSN: 1432-1106
    Schlagwort(e): GABA ; Localization ; Dendritic action
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In isolated transverse hippocampal slices GABA (gamma-amino-butyric acid) was applied iontophoretically to various parts of the dendritic tree of CA1 pyramidal cells. Indices of GABA effects were reduced amplitude of orthodromically driven CA1 population spikes and inhibition of single CA1 units driven by orthodromic stimulation or by application of L-glutamate. Weak iontophoretic currents of GABA (3–6 nA, backing current -3 nA) effectively reduced the amplitude of the population spike and arrested unit activity when applied in a position close to the soma. The effect was halved when GABA was applied 25–30 μm away at right angles to the main dendritic axis. In the direction of the main dendritic axis, GABA was effective as far as 250 and 150 μm from the soma in the apical and basal dendritic directions, respectively, corresponding to about 50% of the total dendritic length. The best effect was usually found at a depth corresponding to that of the recording electrode, probably because the main dendritic axis was parallel to the slice surface. The sharp localization of GABA sensitivity when applied in the pyramidal layer supports earlier evidence that GABA mediates the basket cell inhibition on the soma of the pyramidal hippocampal cells. In the dendritic tree, GABA may also have an inhibitory function with an effectiveness matching that of the soma application.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01208595
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  • 7
    Digitale Medien
    Digitale Medien
    Simulation of a Neuronal Network operating Rhythmically through Recurrent Inhibition (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 289-290 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The theory has been tested by simulation of a neuronal network on a digital computer, IBM 1620. Eighty neurones were made to discharge randomly, all at a given probability of firing (PF) (Fig. IA). Following the discharge of any cell, up to five other neurones were subjected to a drop of their PF ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/204289a0
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  • 8
    Digitale Medien
    Digitale Medien
    Strychnine-Resistant Central Inhibition: Strychnine-resistant Inhibition in the Brain (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 843-845 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN the spinal cord it has been shown that strychnine very effectively depresses the activity of the postsynaptic inhibitory synapses which are formed by a variety of pathways converging on motoneurones1?4. Strychnine depresses the inhibitory action of the olivo-cochlear bundle on sensory fibre ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/200843a0
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  • 9
    Digitale Medien
    Digitale Medien
    Acetylcholine: a Central Transmitter? (1962)
    [s.l.] : Nature Publishing Group
    Nature 195 (1962), S. 1105-1106 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] This communication is concerned with the excitatory effect of acetylcholine on neurones in the ventrobasal complex of the thalamus of cats anaesthetized with sodium pentobarbital. Extracellular action potentials (0-2-1-0 mV) were recorded by means of the central barrel of five-barrel ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/1951105a0
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  • 10
    Digitale Medien
    Digitale Medien
    Inhibitory Phasing of Neuronal Discharge (1962)
    [s.l.] : Nature Publishing Group
    Nature 196 (1962), S. 645-647 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SEVERAL large aggregations of neurones in the central nervous system exhibit a tendency to synchronize responses which recur at relatively slow frequencies. The best-known example is the alpha rhythm which occurs in various areas of the cerebral cortex, neuronal discharges tending to occur in phase ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/196645a0
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