Results 221 to 230 of about 86,308 (267)

Intracellular bicarbonate in single skeletal muscle fibers

Pfl�gers Archiv European Journal of Physiology, 1974
This is the first direct potentiometric determination of intracellular bicarbonate concentration. The new method involves the use of a double-barrelled HCO3 −-selective liquid ion-exchange microelectrode that permits the simultaneous determination of intracellular [HCO3 −] and membrane PD of single cells.
R N, Khuri, K K, Bogharian, S K, Agulian
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How Do Skinned Skeletal Muscle Fibers Relax?

Biochemical and Biophysical Research Communications, 1999
When free calcium is rapidly removed from skinned fibres using the photolabile Ca2+ chelator diazo-2, they relax without an appreciable change in sarcomere length (
B K, Hoskins, S, Lipscomb, I P, Mulligan, C C, Ashley   +3 more
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Calcium sparks in skeletal muscle fibers

Cell Calcium, 2005
Ca(2+) sparks monitor transient local releases of Ca(2+) from the sarcoplasmic reticulum (SR) into the myoplasm. The release takes place through ryanodine receptors (RYRs), the Ca(2+)-release channels of the SR. In intact fibers from frog skeletal muscle, the temporal and spatial properties of voltage-activated Ca(2+) sparks are well simulated by a ...
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Chloride channels in toad skeletal muscle fibers

Journal of Experimental Zoology, 2000
Chloride currents were measured in short lumbricalis fibers of toads (Bufo arenarum) with voltage and patch clamp techniques. For the availability of chloride currents we applied a double-pulse technique in voltage-clamped fibers. When the test pulse was preceded by a positive prepulse, the initial current was larger than with a negative prepulse and ...
G C, Bertrán, B A, Kotsias
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Sodium currents in human skeletal muscle fibers

Muscle & Nerve, 1982
AbstractSodium currents from human external intercostal muscle fibers were recorded using the Hille‐Campbell voltage clamp method. Sodium currents are analyzed in terms of the m and h parameters of the Hodgkin‐Huxley model. The results indicate that the kinetics and voltage dependence of sodium currents in human skeletal muscle fibers are very similar ...
T E, DeCoursey, S H, Bryant, R J, Lipicky   +2 more
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Hyperinnervation of Skeletal Muscle Fibers: Dependence on Muscle Activity

Science, 1973
After the motor nerve to the rat soleus muscle was blocked reversibly by local anesthesia, individual muscle fibers became innervated by a transplanted motor nerve without losing their original innervation. Such cross-innervation of the denervated soleus muscle by the same foreign nerve was largely reduced by direct electrical stimulation of the muscle.
J K, Jansen, T, Lomo, K, Nicolaysen, R H, Westgaard   +3 more
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Sarcomeric Oscillations in Frog Skeletal Muscle Fibers

Science, 1968
Brief asynchronous, small-amplitude, cyclic, longitudinal displacements of the striations of frog skeletal muscle fibers were observed with ordinary light microscopy after application of caffeine and certain quaternary ammonium compounds. With time these oscillations became synchronized and evolved into peristaltic-like movements. The oscillations were
L A, Marco, W L, Nastuk
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Myosin types in human skeletal muscle fibers

Histochemistry, 1980
By combining enzyme histochemistry for fiber typing with immunohistochemistry for slow and fast myosin a correlation between fiber type and myosin type was sought in human skeletal muscle. Fiber typing was done by staining for myofibrillar ATPases after preincubation at discriminating pH values.
R, Billeter, H, Weber, H, Lutz, H, Howald, H M, Eppenberger, E, Jenny   +5 more
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Dynamic shape of tapered skeletal muscle fibers

Journal of Morphology, 1991
AbstractThe muscle fibers of the feline biceps femoris have tapered ends, across which tension is transmitted to the endomysium. The angle of taper of 11 ends, measured on scanning electron micrographs, varied between 0.16° and 1.18°. The muscle fibers are highly variable in cross‐sectional shape.
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Skeletal Musculature. Red Muscle Fiber

1985
Red muscle fibers have a smaller diameter, fewer myofibrils (1), and thus more sarcoplasm and myoglobin than the white fibers. The form and structure of the nuclei and Golgi apparatus are identical in both types of fiber. The major difference is the considerably greater number of crista-rich mitochondria (2) in the red fibers.
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