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  • 1
    Electronic Resource
    Electronic Resource
    Water-Soluble Vitamin Absorption in Intestine (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physiology 42 (1980), S. 157-171 
    Details
    ISSN: 0066-4278
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ph.42.030180.001105
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  • 2
    Electronic Resource
    Electronic Resource
    Gibberellic acid-stimulated and auxin-stimulated cell growth in relation to RNA synthesis, protein synthesis and development in the wheat coleoptile (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Young excised coleoptiles from dark grown wheat have their cell growth promoted by gibberellic acid (GA3), while sections from older coleoptiles have their cell growth promoted by auxin. The GA3 response has a much longer lag period than that of auxin. Neither GA3 nor auxin has any effect on 14C-leucine and 14C-uridine incorporation and uptake after 1 h, indicating that the lag in growth stimulation following GA3 application is not associated with changes in protein or RNA synthesis. Following a 6 h incubation there are small increases in 14C-leucine and 14C-uridine incorporation in response to both GA3 and auxin, and in the case of auxin this is associated with increased uptake. Studies on protein and RNA turnover using pulse-chase experiments have shown that both GA3 and auxin have no effect on protein and RNA stability. There are, however, developmental changes in RNA and protein synthesis that should be considered in any explanation of the mechanism of action of these hormones on cell growth. Young GA3-sensitive tissue has high rates of RNA synthesis and low protein and RNA turnover, while auxin-sensitive tissue has low rates of RNA synthesis, slightly higher rates of RNA turnover and much higher rates of protein turnover. The evidence overall favours more effective utilisation by GA3 and auxin of a basal control level of RNA and protein synthesis and turnover in coleoptile tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00311.x
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  • 3
    Electronic Resource
    Electronic Resource
    Luminance dependence of pigment color discrimination in bees (1981)
    Springer
    Journal of comparative physiology 141 (1981), S. 379-388 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. A system is described in which a behavioral test is used to match color shades to an arbitrarily chosen level to the compound of brightness and saturation. This system was used with honeybees (Apis mellifera carnica) to develop a series of color marks which were equal to the compound of brightness and color saturation to bees. 2. Freely flying honeybees were trained to a blue color mark on a vertical screen. Discrimination of this blue color from violet, green, blue-green and yellow was tested at various natural luminances. In the majority of the experiments the background screen was painted achromatic grey of the same luminosity as the color marks. Two training procedures were used: one utilized a feeding station, the other the hive entrance. 3. Bees discriminate colors best at luminances between 101 and 102 cd/m2. Color discrimination is less acute at both higher and lower luminance levels; these deficits at high and low luminances have been termed the bright light and dim light effects, respectively. Color discrimination disappears below 10−1 cd/m2 (Fig. 6). The dependence of color discrimination on available light is the same in both the violet and blue-green regions. 4. It is concluded that bees have achromatic vision at low light levels (〈10−1 cd/m2), and that they can use this achromatic vision during extreme low light situations — even during flight orientation. The bright light effect is discussed with respect to results from single unit electrophysiological recording experiments and appears to result from the specific behavior of light adaptation in the retinula cell — monopolar cell system. The narrow luminance band of optimum color discrimination suggests that color discrimination may be better than previously determined using selfruminant spectral lights (von Heiversen 1972a).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609940
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  • 4
    Electronic Resource
    Electronic Resource
    A model of the nerve impulse using two first-order differential equations (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 162-164 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although our model may be seen as a generalization of the Fitzhugh equations2, it can be developed from first principles if it is assumed that the rate of change of membrane potential depends linearly on z (the current passed through the electrode), and y (an intrinsic current), and depends ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296162a0
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  • 5
    Electronic Resource
    Electronic Resource
    BVP models of nerve membrane (reply) (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 375-375 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HINDMARSH AND ROSE REPLY - The novel feature we wished to draw attention to was not the positive gradient of the isocline y = 0 in the region x 〈 0, but rather the close proximity of the isoclines x = 0 and y = 0. This proximity is determined by zxp(00)" which is small according to both the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/299375b0
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  • 6
    Electronic Resource
    Electronic Resource
    Cadmium toxicity and its effect on the testes of an Australian marsupial (Trichosurus vulpecula) (1981)
    Springer
    Bulletin of environmental contamination and toxicology 26 (1981), S. 233-236 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01622082
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  • 7
    Electronic Resource
    Electronic Resource
    Plastid number and plastid structural changes associated with tobacco mesophyll protoplast culture and plant regeneration (1983)
    Springer
    Planta 158 (1983), S. 329-338 
    Details
    ISSN: 1432-2048
    Keywords: Chloroplast development ; Nicotiana (plastids) ; Plastid (division, DNA, ultrastructure) ; Plotoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mesophyll protoplasts were isolated from Nicotiana tabacum L. cv. Xanthi, and cell-colony formation induced in liquid culture. The plastid changes associated with the morphogenetic sequence from mesophyll protoplast to whole plant were examined. Minor ultrastructural changes in the plastids were evident after 1 d of culture, but by 8 d (four-to-eight-cell stage) the plastids were small, there was much less thylakoid membrane appression, and many prominent plastoglobuli were also present. Plastid-division figures were evident at this point of time and it was common to find plastids clustered around the nucleus. A typical proplastid was the dominant plastid type in the cultured cells from about 11 d until about five weeks when large amyloplasts and pregranal plastids were observed. Normally structured chloroplasts were present in the regenerated plant. There was no plastid division until the four-cell stage, with plastid numbers per cell approximately halving at each cell division, then stabilising around 12 per cell during cell-colony development, a number typical of meristematic cells. Though nucleoids were always present, their numbers in the plastids were reduced by the eight-cell stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397335
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  • 8
    Electronic Resource
    Electronic Resource
    On the nature of chemical communication by crayfish in a laboratory controlled flow-through system (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 1065-1071 
    Details
    ISSN: 1573-1561
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987887
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  • 9
    Electronic Resource
    Electronic Resource
    Chemical communication in crayfish: (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 1289-1292 
    Details
    ISSN: 1573-1561
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988556
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  • 10
    Electronic Resource
    Electronic Resource
    Diffusion in the CuSn binary system: application to Nb3Sn composites (1984)
    Springer
    Journal of materials science 19 (1984), S. 497-500 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Non-parabolic growth of intermediate phases in CuSn binary diffusion couples has been observed at 220° C. The deviation from parabolic behaviour may be attributed to grain boundary diffusion. Diffusion coefficients for both the∈-(Cu3Sn) andη-(Cu6Sn5) phases are typically of the order of 2×10−11 cm2 sec−1, and are in general agreement with other published values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553573
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