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  • 1
    Electronic Resource
    Electronic Resource
    Secondary deuterium isotope effects for acid-catalyzed hydrolysis of inosine adenosine (1978)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 7620-7624 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00492a030
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of formation of Grignard reagents (1978)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 3163-3166 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00478a034
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A kinetic .alpha.-deuterium isotope effect for the binding of purine nucleosides to calf spleen purine nucleoside phosphorylase. Evidence for catalysis by distortion (1978)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 6249-6251 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00487a057
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Selective predation by carp (Cyprinus carpio L.) on benthic molluscs in Skadar Lake, Yugoslavia (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 7 (1975), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Analysis of predation by carp (Cyprinus carpio L.) on mollusc species in Skadar Lake, Yugoslavia, indicated both generalized and specific features of a predator-prey interaction. Vertical distribution of molluscs in sediments seemed unrelated to predation rates by carp. Although size selective predation may occur, electivity indices appeared most related to shell shape and thickness. Of the three most abundant species, electivity was high for Valvata piscinalis but low for Pyrgula annulata and Dreissencia polymorpha. Valvata has a more readily crushed shell, a higher proportion of occupied shells and a greater percentage of organic content than Pyrgula. Although a potentially preferred prey item, Dreissencia probably escaped intensive predation by being attached to larger objects. Carp appeared to utilize a sequence of tactile and gustatory cues in the prey selection process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1975.tb04613.x
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  • 5
    Electronic Resource
    Electronic Resource
    The effects of multiple reflex pathways on the oscillations in neuro-muscular systems (1976)
    Springer
    Journal of mathematical biology 3 (1976), S. 87-101 
    Details
    ISSN: 1432-1416
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary A model of mammalian neuro-muscular systems described previously (Oğuztöreli and Stein, 1975) has been extended to include multiple reflex pathways, as have been shown to exist in primates, including man (Milner-Brown et al., 1975). A number of general mathematical properties of the extended system are described. In the final section, using computer solutions, it is shown that the presence of multiple reflex pathways can effectively reduce the tendency for oscillation which will exist if high reflex gain were concentrated in a single pathway. High loop gain is desirable for good control in any negative feedback system, so the presence of multiple reflex pathways could improve reflex control, while limiting the magnitude of tremor or other unwanted oscillations in neuromuscular systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307860
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  • 6
    Electronic Resource
    Electronic Resource
    A kinetic study of muscular contractions (1977)
    Springer
    Journal of mathematical biology 5 (1977), S. 1-31 
    Details
    ISSN: 1432-1416
    Keywords: Kinetics of muscular contractions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary In the present work the kinetics of muscular contractions are studied, based on a three-state model which is introduced in Section I. The general properties of this class of models for muscular contractions are derived in Sections II–VI. The kinetic equations are solved for four particular examples in Sections VII–X. These analytical results should be useful for comparison with experimental data to determine the functional dependence of the rate constants α and β on muscle length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275803
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  • 7
    Electronic Resource
    Electronic Resource
    An analysis of oscillations in neuro-muscular systems (1975)
    Springer
    Journal of mathematical biology 2 (1975), S. 87-105 
    Details
    ISSN: 1432-1416
    Keywords: Oscillations in neuro-muscular systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary In a recent work the mammalian neuro-muscular system has been investigated by the authors from the physiological point of view. This system is described by a nonlinear differential-difference equation. In the present work we analyse the differential-difference equation and investigate the oscillations pertaining to the neuro-muscular system. The dependence of these oscillations on the muscular and neural feedback parameters has been studied systematically. Several simple relationships are described which can be compared with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275922
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Interactions between centrally and peripherally generated neuromuscular oscillations (1979)
    Springer
    Journal of mathematical biology 7 (1979), S. 1-29 
    Details
    ISSN: 1432-1416
    Keywords: Neuromuscular oscillations ; Non-linear integro-differential difference equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Summary An experimentally based model of the mammalian neuromuscular system has been extended to include the interaction of sinusoidal inputs generated within the central nervous system and those produced peripherally by reflex pathways, together with muscle properties and external loads. Multiple reflex pathways and pathways having acceleration as well as velocity and length sensitivity are considered. The responses are analyzed for brief inputs (Dirac δ-functions), sinusoidal driving functions and mixtures of the two over ranges in which the model behaves either linearly or non-linearly. Approximate solutions are derived for the non-linear range, and exact numerical solutions are computed for a few examples within the linear range. The extent to which brief inputs can reset ongoing oscillations and the extent to which sinusoidal inputs can entrain these oscillations are of particular interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276411
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  • 9
    Electronic Resource
    Electronic Resource
    Recent developments in polymer applications of small-angle neutron, X-ray and light scattering (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 346-375 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Recent advances in the small-angle scattering of X-rays, neutrons and light by polymers are reviewed. The three techniques are compared, from both experimental and theoretical points of view. Applications are discussed for the study of homophase and heterophase polymers, both in solution and in the solid state, as well as for unoriented and oriented crystalline polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013485
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of elastic loads on the contractions of cat muscles (1976)
    Springer
    Biological cybernetics 22 (1976), S. 129-137 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract The nerves to plantaris and soleus muscles in the cat were stimulated with maximal single shocks and with random stimulus trains which produced partially fused contractions. In order to obtain information on the mechanism of muscular contraction, the effects of allowing the muscles to shorten against various elastic loads were studied in the time domain and in the frequency domain. When springs of increasing stiffness were placed in series with the muscle, the twitch tension increased greatly. The gain of the frequency response curve was also much greater with stiffer springs. The shape of the frequency response curve for plantaris muscle could usually be described by that expected for a second-order system with two real time constants or rate constants. The rate constants changed in qualitatively similar ways in response to increased stiffness of an elastic load, increased muscle length and increased mean rate of nerve stimulation. These results are in agreement with the hypothesis that the linear responses of muscles working against elastic loads are determined by the values of two rate constants. Thus, of the many processes associated with contraction, only two are rate-limiting: one associated with the viscoelastic properties of muscle and the second associated with the reuptake of Ca into the sarcoplasmic reticulum. Non-linear aspects of muscular contraction are also discussed. These are more prominent in soleus muscle than in plantaris muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365523
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