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  • 1
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    Forced dilemma to come in muscle contraction (1988)
    Springer Nature
    Details
    Publication Date: 1988-08-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
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    Fusion Frequency and Light Quantity (1959)
    Springer Nature
    Details
    Publication Date: 1959-12-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 3
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    Energy storage by passive elastic structures in the mantle of sepia officinalis (2000)
    Company of Biologists
    In:  Journal of Experimental Biology, 203 (5). pp. 869-878.
    Details
    Publication Date: 2021-06-28
    Description: The passive elastic properties of the mantle of the cuttlefish Sepia officinalis have been characterized in experiments on intact mantle and on pieces cut from the mantle. The mantle was found to be very compliant over a wide range of circumferential strains, corresponding to a change in mantle circumferential strain of 0.45. Beyond this range of strain, the mantle was much stiffer, in both the circumferential direction, 0.542+/−0.025 MPa (mean +/− s.e.m., N=51) and through the thickness of the mantle wall, 0.152+/−0.041 MPa (N=11). Almost 80 % of the work done on the tissue during compression in the circumferential direction was recovered during elastic recoil of the tissue; this elastic work could contribute to refilling the mantle after a jet. Our estimates of the work done during a cycle of jetting and refilling show that such elastic work is small (approximately 1 %) compared with the contractile work done by the circular muscle fibres. However, although the elastic work is almost negligible in the overall energy budget, it is probably sufficient to power refilling of the mantle.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    Electronic Resource
    Electronic Resource
    Fusion Frequency and Light Quantity (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1873-1874 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Within limits, the fusion frequency varies linearly with the logarithm of the light intensity (Ferry-Porter Law1) and with that of the areal subtense (Granit-Harper relation2). It has recently been shown that, for the rod-free area of the retina, the operative variable is the light quantity3. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841873a0
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  • 5
    Electronic Resource
    Electronic Resource
    Forced dilemma to come in muscle contraction (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 655-655 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Malcolm Irving, in his interesting News and Views1 comment on the results of Kishino and Yanagida2, does not point out a major dilemma that will result for the understanding of muscle contraction if their preliminary estimate of the force per crossbridge at less than 1 pN is confirmed. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334655c0
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  • 6
    Electronic Resource
    Electronic Resource
    Heat production by single fibres of frog muscle (1983)
    Springer
    Journal of muscle research and cell motility 4 (1983), S. 207-222 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The heat produced during contractions of preparations consisting of one or a few muscle fibres was measured for the first time. Fibres were dissected from the anterior tibialis muscles of the frog,Rana temporaria. Measurements were made with thermopiles of a design based on that described by Howarthet al. (1975). Although the fibre preparations were small, measurable signals could be recorded because the heat capacity of the thermopiles was also small. The output of the thermopile was amplified by a galvanometer circuit. In all the experiments the ends of the preparation were held in a fixed position during stimulation (‘isometric’). Observations were made of heat production during twitches and tetanic contractions. The heat produced in a twitch of a single fibre depended on the stimulus strength in an all-or-nothing way. The results show that the amount of heat produced in individual twitches is fairly constant at different temperatures in the range 3–15° C. In contrast, the heat produced in tetanic contractions is considerably greater at higher temperatures. The time course of heat production in a tetanus was influenced by temperature such that the early rapid phase of heat production was less obvious at the higher temperature. The quantities of heat produced by fibre preparations were in reasonable agreement with those produced by whole muscles when the comparison was made on the basis of heat produced per g wet weight of tissue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712031
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  • 7
    Electronic Resource
    Electronic Resource
    Thermodynamic analysis of calcium binding to frog parvalbumin (1985)
    Springer
    Journal of muscle research and cell motility 6 (1985), S. 757-768 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The enthalpy of calcium binding to frog parvalbumin (Rana temporaria isoenzyme IVb, pI 4.75) has been measured by microcalorimetry. The reaction is exothermic; the heat of the reaction in 100mm KCl, 50mm Tris, pH 8.0 at 12° C is −19 kJ (mol site)−1 and −33 kJ (mol site)−1 in the presence of 1mm magnesium. The shape of the titration curve indicates that the properties of the two calcium binding sites are different. The thermodynamic parameters measured for frog parvalbumin are compared with those of related parvalbumins from carp and whiting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00712240
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  • 8
    Electronic Resource
    Electronic Resource
    Absolute values of myothermic measurements on single muscle fibres from frog (1986)
    Springer
    Journal of muscle research and cell motility 7 (1986), S. 327-332 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The heat and force produced in tetanic contraction of single fibres from anterior tibialis muscle of the frogRana temporaria have been observed at measured temperatures close to 1 and 10° C. Heat was measured using a Hill-Downing type thermopile. In control experiments with a resistor of known heat capacity comparable to a single muscle fibre, it was found that Peltier and Joule heating produced identical thermopile outputs. The Peltier method was used to introduce a known amount of heat into the system in each experiment with a muscle fibre. From the response to this heating the heat capacity of each preparation was obtained and used to calculate the absolute amount of heat production from the thermopile output. The heat produced during tetanic contraction (H) could be described by Aubert's equation [H=H a (1−e t/τ)+h b t]. In some fibres there was no labile heat (Ha), whereas in others it was clearly present. The stable heat rate (h b ) was strongly temperature dependent (Q 10 = 4.06). At 0° C the stable heat rate (normalized by dry weight) in the single fibres was significantly greater than that in whole anterior tibialis muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01753653
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  • 9
    Electronic Resource
    Electronic Resource
    Contraction with shortening during stimulation or during relaxation: how do the energetic costs compare? (1998)
    Springer
    Journal of muscle research and cell motility 19 (1998), S. 797-802 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract White muscle fibres from dogfish were used to compare the energetic costs of shortening by fully active muscle and by relaxing muscle. The muscle preparation was tetanized for 0.6s and shortened either during stimulation or during relaxation. The distance shortened was 1mm (about 15% L0, the muscle length optimum for force) and the velocity was 3.5 or 7.0mms−1 (about 15 or 30% V0, the maximum velocity of shortening). Isometric tetani at L0 were also investigated. Mechanical work and heat production were measured, and work + heat was taken as a measure of energetic cost. Both work and the energetic cost were higher with shortening during stimulation than with shortening during relaxation. The results suggest that shortening during relaxation, which is known to occur during locomotion in vivo, may be an energy-saving strategy. © Kluwer Academic Publishers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005455505056
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  • 10
    Electronic Resource
    Electronic Resource
    Biological structures and coupled flows (1984)
    Springer
    Journal of muscle research and cell motility 5 (1984), S. 349-350 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713112
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