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Article
Single turnover of cross-bridge ATPase in rat muscle fibers studied by photolysis of caged ATP
A mechanical study on skinned rat psoas muscle fibers was performed at about 16°C with X-ray diffraction and caged-ATP photolysis. The amount of photoreleased ATP was set <0.2 mM for analysis of a `single turn...
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Article
Structural changes in myosin cross-bridges during shortening of frog skeletal muscle
X-ray diffraction patterns from frog sartorius muscle were recorded during steady shortening with various loads. The intensity of the third meridional reflection from the thick filament decreased on shortening...
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Article
X-ray diffraction study on mammalian visceral smooth muscles in resting and activated states
Structural changes of guinea pig taenia coli and rat anococcygeus muscle during contraction were studied by X-ray diffraction. The diffraction pattern of the taenia coli showed the 14.4-nm myosin reflection, t...
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Article
Effects of 2,3-butanedione monoxime on contraction of frog skeletal muscles: An X-ray diffraction study
We studied the effects of BDM (2,3-butanedione monoxime) on the tetanic contraction of frog skeletal muscles using an X-ray diffraction technique. BDM significantly increased the resting equatorial intensity r...
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Article
Myosin heads contact with thin filaments in compressed relaxed skinned fibres of frog skeletal muscle
When skinned skeletal muscle fibres with rest sarcomere length (L=2.5 μm) are compressed by the addition of various concentrations ([PVP]) of polyvinylpyrrolidone, the relation between the 1,0 spacing (d) of t...
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Article
Immunocytochemical and biochemical studies on the localization and changes of 17 α-hydroxylase/C17–C20 lyase activity in immature rat ovary treated with PMSG and hCG
The localization of cytochrome P-450 of 17 α-hydroxylase/C17–C20 lyase (P-45017 α, lyase) and the changes of the enzyme activity were studied immunocytochemically and biochemically in the ovaries of immature rats...