全文获取类型
收费全文 | 457篇 |
免费 | 15篇 |
国内免费 | 11篇 |
专业分类
系统科学 | 9篇 |
丛书文集 | 11篇 |
教育与普及 | 5篇 |
理论与方法论 | 1篇 |
现状及发展 | 108篇 |
综合类 | 346篇 |
自然研究 | 3篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 5篇 |
2021年 | 1篇 |
2020年 | 4篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 15篇 |
2014年 | 15篇 |
2013年 | 12篇 |
2012年 | 24篇 |
2011年 | 11篇 |
2010年 | 13篇 |
2009年 | 22篇 |
2008年 | 31篇 |
2007年 | 19篇 |
2006年 | 23篇 |
2005年 | 22篇 |
2004年 | 24篇 |
2003年 | 17篇 |
2002年 | 20篇 |
2001年 | 14篇 |
2000年 | 13篇 |
1999年 | 8篇 |
1998年 | 11篇 |
1997年 | 5篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 11篇 |
1991年 | 4篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 31篇 |
1984年 | 6篇 |
排序方式: 共有483条查询结果,搜索用时 15 毫秒
451.
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. 相似文献
452.
H. Will I. Küttner C. Kemsies R. Vetter E. Schubert 《Cellular and molecular life sciences : CMLS》1985,41(8):1052-1054
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. 相似文献
453.
J. L. Poland F. S. F. Mong J. J. Feher 《Cellular and molecular life sciences : CMLS》1985,41(2):254-256
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. 相似文献
454.
Diltiazem prevents the damage to cultured aortic smooth muscle cells induced by hyperlipidemic serum
K. Saito S. Birou H. Fukunaga M. Kakei T. Kashima H. Tanaka 《Cellular and molecular life sciences : CMLS》1986,42(4):412-414
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. 相似文献
455.
G. N. Chaldakov P. I. Ghenev V. N. Vankov 《Cellular and molecular life sciences : CMLS》1985,41(3):390-392
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. 相似文献
456.
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. 相似文献
457.
心脏电信号的动态关联维分析 总被引:1,自引:2,他引:1
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。 相似文献
458.
Metabolic biochemistry and the making of a mesopelagic mammal 总被引:1,自引:0,他引:1
P. W. Hochachka 《Cellular and molecular life sciences : CMLS》1992,48(6):570-575
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. 相似文献
459.
过度训练对心肌组织影响的研究进展 总被引:1,自引:0,他引:1
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。 相似文献
460.
Pyrophosphate (PPi) 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 PPi 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. PPi 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 PPi also affects the energy-requiring cyclic cross-bridge motions. 相似文献