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At least 1,405 records · Page 78Linked to original sources
PubMed1983

[Calcium localization in the degenerating myotubes of developing skeletal muscle in the chick embryo].

Ca-accumulating formations found in degenerating myotubes of chick embryo by pyroantimonate technique have been identified as membrane bound bodies in the material fixed routinely for electron microscopy. These bodies seem to represent initial stages of a lipid degeneration of membranous structures. It is assumed that calcification of single degenerating subcellular structures may limit spreading necrosis over the whole cell.

Animals↗
PubMed1984

Histochemical differentiation of four species of the genus Trichinella from days 10-40 of their development in muscles of experimentally infected mice.

Differences in an infection of the muscle caused by larval T. pseudospiralis (from days 10-40 p.i.) and that caused by capsule-forming Trichinella larvae were disclosed with histochemical techniques. These were: An intense reaction of the modified sarcoplasm for neutral mucosubstances, and intense staining of spherical centres of re-differentiation in the sarcoplasm for tyrosine, activity of the acid phosphatase, a negative reaction for SS groups of proteins at the site of location of the parasite owing to the absence of a collagen-like substance deposited by capsule-forming Trichinella species. Alkaline phosphatase activity weak in a sarcoplasm infected with larval T. pseudospiralis, but intense in capsule-forming species suggesting a different, larval metabolism. The capsule of T. nativa which is produced later than that of T. spiralis and T.nelsoni, differs from these also histochemically in that it contains neutral polysaccharides on the surface of the outer capsule layer which stains for non-sulphonated, acid mucosubstances (hyaluronic acid). Inspection with the electron microscope disclosed a vacuolate substance containing glycoprotein, phospholipids, and displaying acid phosphatase activity. The substance was present in the vicinity of larvae of T. nativa occupying the space between the cuticle and the sarcoplasm. A slight, morphological difference between T. nelsoni and T. spiralis was observed in the more elongate shape of the capsule at days 30 and 40 p.o. Histochemical differences were in an oxidative reaction with aldehyde fuchsin (PAA AF, KMnO4 A F) showing an increased hypertrophy of the connective tissue surrounding muscle fibres infected with T. nelsoni.

Animals↗
PubMed1982

[Calcium in the developing skeletal muscles of the chick embryo].

The osmium-pyroantimonate technique was used for the ultrastructural study of Ca2+-localization in two types of chick embryo skeletal muscles: m. pectoralis and m. soleus. In 8- and 12-day old embryos the pyroantimonate precipitate was found on plasmalemma, condensed chromatine and ribosomes and in N-lines of I-band. During myogenesis (15-, 21-day old embryos) the calcium precipitate is redistributed from the above mentioned sites to terminal cisternae and N-line of I-band. It is proposed that calcium of N-lines may be involved in the glycogenolysis, its association with the muscle contraction occurring particularly at early developmental stages.

Animals↗
PubMed1982

[Determination of the effectiveness of certain physical conditioning apparatuses for development of muscle quality].

This study attempted to compare on twenty male subjects the intensity of muscular activity during selected exercises executed with and without physical fitness gadgets. Each subject executed two exercises with or without the Total Body Shaper, three exercises with or without the Power X and one exercise with or without the Prone Cycle. The electrical activity of four muscles was studied for each exercise; theoretical data and the publicity of the manufactures were utilized to select the muscles. The statistical analysis showed that exercises executed with the Total Body Shaper are generally less solicitating than similar exercises executed without the gadget, that the Power X has evident advantages for the muscle groups that it activates but that its manufacturers tend to generalize its effects to muscle groups that it does not solicitate and, finally, that the Prone Cycle is the least valuable of the gadgets tested. The results enlighten the need for consumer protection agencies to look more carefully at the publicity utilized to promote the benefits of physical fitness gadgets.

Adult↗
PubMed1978

[Organogenetic development of muscles in the deep extensor layer of the front limb in the golden hamster (Mesocricetus auratus)].

The author has investigated a complete series of cross-sections of thoracic extremities of the embryos and foetuses of Mesocricetus auratus of different age. He describes the successive stages of manifestation and differentiation of the deep-layer primordia of the extensor muscles of the fingers. He treats the facts also of an evolutionary myology point of view.

Animals↗