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  • 1
    Electronic Resource
    Electronic Resource
    Interpretation of the X-ray diffraction pattern from relaxed skeletal muscle and modelling of the thick filament structure (1992)
    Springer
    Journal of muscle research and cell motility 13 (1992), S. 406-419 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The first part of this paper is devoted to the model-building studies of our high resolution meridional X-ray diffraction patterns (in the region from 1/500 to 1/50 Å−1) obtained from relaxed frog muscle. A one-dimensional model of thick filament was proposed which basically consists of two symmetrical arrays of 50 crossbridge crown projections. In the proximate and central zones of the filament the crossbridge crowns are regularly shifted with a 429 Å period and appear as triplets with a 130 Å distance between crowns, while the crowns in the distal parts of filament are regularly ordered with a 143 Å repeat. The centre-to-centre distance between regions with crossbridge perturbations is 7050 Å. The length of each crown projection is about 125 Å. The model includes also (1) C-protein component represented in each half of the filament by seven stripes of about 350 Å long and located 429 Å apart, (2) a uniform density of filament backbone of about 1.5 μm length, and (3) 13 high density stripes in a central zone located with 223 Å period. The final model explains very well the positions and intensities of the main meridional reflections. A three-dimensional model of crossbridge configuration is described in the second part of the work. The model was constructed by using the intensity profiles of the first six myosin layer lines of the X-ray pattern from stretched muscle and taking into account the crossbridge perturbations and the axial size of crossbridge crown obtained from the one-dimensional studies. It was found that both myosin heads are tilted in opposite directions along the filament and wrap around the filament backbone. This crossbridge configuration corresponds well to the findings of Haselgrove. To take into account interference effects between thick filaments we proposed a model of the filament hexagonal lattice with disorder of the second kind. The cross-sectional width of crystalline domains in stretched muscle was estimated to be about 0.11 μm. The models presented may be helpful in the interpretation of the X-ray diffraction patterns from contracting muscle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01738036
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  • 2
    Electronic Resource
    Electronic Resource
    Comments on “clarification and application of ion parametric resonance model for magnetic field interactions with biological systems” by Blanchard and Blackman (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 16 (1995), S. 268-269 
    Details
    ISSN: 0197-8462
    Keywords: Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250160410
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  • 3
    Electronic Resource
    Electronic Resource
    Millimeter-wave effects on electric activity of crayfish stretch receptors (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 12 (1991), S. 203-214 
    Details
    ISSN: 0197-8462
    Keywords: microwaves ; SHF ; mechanoreceptor ; temperature ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The effects of super high frequency (SHF) microwaves (34-78 GHz) on rates of spontaneous firing of the slowly adapting, stretch-receptor neurons of crayfish were studied. Initially, irradiation of continuously perfused, fluid-cooled preparations at power densities to 250 mW/cm2 caused a transient decrease in the rate of spontaneous firing (the dynamic response). Subsequently, with extinction of the SHF field, the rate of firing increased, finally stabilizing at pre-exposure levels (stationary phase). Rates of firing also increased when the receptor muscle was stretched, and they were inversely correlated with small, field-induced increases of temperature (∼1.5°C). The response to SHF radiation did not depend on frequency if temperature of the medium was constant. No resonant peaks were found when the millimeter range of frequencies was scanned.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250120402
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  • 4
    Electronic Resource
    Electronic Resource
    Possible mechanism for the influence of weak magnetic fields on biological systems (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 12 (1991), S. 71-75 
    Details
    ISSN: 0197-8462
    Keywords: cyclotron resonance ; parametric resonance ; Ca2+-binding protein ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: A physical mechanism is suggested for a resonant interaction of weak magnetic fields with biological systems. An ion inside a Ca2+ -binding protein is approximated by a charged oscillator. A shift in the probability of ion transition between different vibrational energy levels occurs when a combination of static and alternating magnetic fields is applied. This in turn affects the interaction of the ion with the surrounding ligands. The effect reaches its maximum when the frequency of the alternating field is equal to the cyclotron frequency of this ion or to some of its harmonics or sub-harmonics. A resonant response of the biosystem to the magnetic field results. The proposed theory permits a quantitative explanation for the main characteristics of experimentally observed effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250120202
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