Demonstration of the structural connections of the longitudinal muscle cells and circular muscle cells,and interconnections between the two,in the alimentary canal of an oligochaete,Branchiura sowerbyi B.

Summary The longitudinal and circular muscle cells of the alimentary canal of the oligochaete wormBranchiura sowerbyi show intercell couplings. These couplings occur between adjoining cells of the same or of the other orientation.We wish to thank Dr S. Kawaguti, Prof. emeritus of Okayama University, for his kind advice.     

Comparative analysis of phospholamban phosphorylation in crude membranes of vertebrate hearts

Summary Phospholamban, a sarcoplasmic reticulum phosphoprotein, is present in the hearts of mammalian, avian, amphibian, and fish species. Phylogenetic changes are indicated by marked differences among species in cardiac phospholamban content and by the absence of Ca²⁺/calmodulin-dependent phospholamban phosphorylation at an early developmental stage.     

Calcium uptake by sarcoplasmic reticulum from nerve-intact and standard skeletal muscle grafts

Summary A freely grafted rat soleus muscle exhibits a decrease in velocity and capacity of SR calcium uptake. This deficit is not prevented by maintaining neural connections (nerve-intact graft) during grafting. Thus the greater mechanical capability of nerve-intact grafts, relative to standard grafts, is not accompanied by any enhancement of the SR tubules.     

Diltiazem prevents the damage to cultured aortic smooth muscle cells induced by hyperlipidemic serum

Summary Diltiazem, a calcium antagonist, significantly reduced the increased⁴⁵Ca uptake and the number of dead cells in cultured aortic smooth muscle cells induced by hyperlipidemic serum.     

Colchicine-induced appearance (proliferation) of smooth sarcoplasmic reticulum in arterial smooth muscle cells

Summary Colchicine treatment resulted in the appearance and proliferation of smooth sarcoplasmic reticulum in some smooth muscle cells of the aortic and pulmonary trunk walls in the rabbit. The significance of cytoplasmic microtubules and/or membrane-bound tubulin for the morphogenesis, functioning and control of smooth endoplasmic reticulum in different kinds of cells is discussed.     

The role of muscle in determining growth and size in teleost fish

Summary Rapid growth to large size in fish results from a sustained recruitment of new fibres into their axial series of myomeres. Cessation of recruitment at a small fish size leads to slow growth and a small final size of the fish. Fibre growth dynamics of fishes evidently govern growth and size through fibres' surface area to length ratios, which control their nutrient assimilation rates.     

心脏电信号的动态关联维分析

通过一组动物实验，采用混沌分析方法，对心脏缺血型的ECG电信号进行分析，给出了实验方法、理论、算法，并在分析数据的基础上，肯定了关联维数在分析心脏电活动中的价值，以及关联维对心肌缺血病情的动态变化。     

Metabolic biochemistry and the making of a mesopelagic mammal

Large seals such as northern and southern elephant seals and Weddell seals are able to dive for startling duration and enormous depth. The current dive duration record is 120 minutes (recorded for the southern elephant seal); the current depth record is 1.5 km (recorded for the northern elephant seal). Equally striking is the widespread observation that these seals when at sea spend close to 90% of the time submerged and often at great depth. For practical purposes, these species can be viewed as true mesopelagic animals when they are at sea. A review of current knowledge indicates that low power output but high efficiency metabolic functions of skeletal muscles coupled with inherently low (and potentially further suppressible) metabolic rates constitute strategic biochemical components in the making of a mesopelagic mammal.     

过度训练对心肌组织影响的研究进展

以过度训练对大鼠心肌组织损伤的研究进展为例,说明过度训练是一种常见的运动性病症,是训练与恢复、运动和运动能力、应激和耐受能力之间的不平衡,也是神经-内分泌-免疫网络对身体机能影响的综合表现,使机体处于一种多器官功能紊乱的病理状态。     

Dynamic laser light scattering studies of the effects of pyrophosphate on cyclic motions of cross-bridges in isolated thick myofilaments fromLimulus striated muscle

Pyrophosphate (PP_i) is a non-hydrolyzable ATP analogue known to affect the binding between myosin heads and actin. By using a dynamic laser light scattering method, we have shown that 1–2 mM PP_i enhances the increase in values induced by Ca²⁺ in isolated thick myofilaments fromLimulus striated muscle. However, similar treatment has no effect on the values of filaments suspended in either relaxing solution or ATP-free solution. is the average linewidth of the photoelectron count autocorrelation function of the light scattered. PP_i had no effect on the increase of values by Sr²⁺ but it substantially increased the values of the thick myofilaments suspended in Ba²⁺-substituted Ca²⁺ activating solution. The results show that PP_i also affects the energy-requiring cyclic cross-bridge motions.