The superior rectus muscle of the rabbit can be separated into two plates: One is comprised, solely of F elder struktur ("slow") fibers and the other almost exclusively of Fibrillenstruktur ("twitch") fibers. Responses of isolated portions of the two muscle types to acetylcholine were compared under identical experimental conditions. The results indicate that the Felderstruktur fibers are respo...

The late after-potential that follows trains of impulses in frog muscle fibers is virtually absent when most of the intracellular potassium is replaced by rubidium and the muscle is immersed in rubidium-containing Ringer's fluid. Its amplitude is also reduced in freshly dissected, potassium-containing muscle fibers that are immersed directly in Rb-Ringer's fluid. These findings are discussed in...

NARAHASHI, TOSHIO, TAKEHIKO DEGUCHI, NORIMOTO URAKAWA AND YOSHIO OHKUBO. Stabilisation and rectijication of muscle jber membrane by tetrodotoxin. Am. J. Physiol. I $3 (5) : 934-938. 1g6o.-The mode of action of tetrodotoxin on the frog muscle fiber membrane has been analyzed with the aid of intracellular microelectrodes. Tetrodotoxin of I oH7 concentration made the applied cathodal current ineff...

Consideration is given to the role of a population of muscle fibers of distributed diameters in the observed washout of a tracer, with particular reference to radioisotopic K and muscle fibers. It is concluded that if washout of tracer from a single fiber is described as first order, then washout of tracer from a population of fibers is apt to appear as first order.

The Drosophila embryonic and larval body wall consists of a simple array of segmental muscle fibers, innervated in a precise manner by identified neurons. During development motoneurons were forced to find alternate targets following the selective deletion of a single muscle fiber, the pleural internal oblique #5. We used backfills, intracellular dyefills, and immunocytochemistry in embryos and...

OBJECTIVE Gene expression patterns differ in the two types of skeletal muscle fiber. The Wnt signaling pathway, which includes low-density lipoprotein receptor-related protein 6 (LRP6), has been associated with cell differentiation and glucose metabolism in skeletal muscles. We examined the relationships between muscle fiber types and LRP6 expression. METHODS Adenosine triphosphatase was assa...

This study aimed to analyse the sarcolemma of Col6a1-/- fibers in comparison with wild type and mdx fibers, taken as positive control in view of the known structural and functional alterations of their membranes. Structural and mechanical properties were studied in single muscle fibers prepared from FDB muscle using atomic force microscopy (AFM) and conventional electrophysiological techniques ...

Ischemia and denervation of EDL muscle of adult rat induce a large central zone of degeneration surrounded by a thin zone of peripheral surviving muscle fibers. Muscle regeneration is a complex phenomenon in which many agents interact, such as growth factors and heparan sulfate components of the extracellular matrix. We have shown that synthetic polymers, called RGTA (as regenerating agents), w...

Shueh-Fen Chen and Bao-Quey Huang (2000) Cytochemical profiles and quantitative analysis of fiber types in trunk muscle of tigerperch, Terapon jarbua. Zoological Studies 39(1): 28-37. Fiber types in trunk muscle of the tigerperch, Terapon jarbua, were classified by cytochemical profiles and image analysis techniques. Serial cross-sections of trunk muscle were examined by evaluating myosin ATPas...

BACKGROUND To investigate the muscular changes occurring during femoral lengthening performed in 42 rats. METHODS The rats were randomly divided into six groups and different rates of lengthening were utilized and the rats were sacrificed at the end of the distraction. Histopathologic and histomorphometric measurements were done for all specimens. The results were analyzed statistically by Ma...