共查询到20条相似文献,搜索用时 15 毫秒
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Bhalaghuru Chokkalingam Mani Behzad B Pavri 《Indian pacing and electrophysiology journal》2014,14(1):12-25
More than half a century has passed since the concept of dual atrioventricular (AV) nodal pathways physiology was conceived. Dual AV nodal pathways have been shown to be responsible for many clinical arrhythmia syndromes, most notably AV nodal reentrant tachycardia. Although there has been a considerable amount of research on this topic, the subject of dual AV nodal pathways physiology remains heavily debated and discussed. Despite advances in understanding arrhythmia mechanisms and the widespread use of invasive electrophysiologic studies, there is still disagreement on the anatomy and physiology of the AV node that is the basis of discontinuous antegrade AV conduction. The purpose of this paper is to review the concept of dual AV nodal pathways physiology and its varied electrocardiographic manifestations. 相似文献
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Whole sugar beet (Beta vulgaris L. cv. Ras poly) plants were grown in the greenhouse from the same seed stock used for an
in vitro shoot tip culture. In vitro produced sugar beet plants exhibited a high content of chlorophylls a and b, carotene,
and total and soluble sugars. On the other hand, total protein content of in vivo plants was higher than that of in vitro
plants. No differences were found by SDS-PAGE analysis in the nature and contents of soluble proteins of in vitro propagated
plants and greenhouse-grown plants. Surfaces of epidermal cells were larger and palisade and spongy paranchyma tissues were
thicker in leaves of regenerants than in leaves of seedlings. Vascular tissues in leaf petioles in regenerants were flat and
more differentiated than in seedlings. Closed and undeveloped stomata were found on the abaxial leaf surface of regenerants,
whereas in seedlings the stomata were open.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Lane Yoder 《PloS one》2010,5(2)
Background
Two previous articles proposed an explicit model of how the brain processes information by its organization of synaptic connections. The family of logic circuits was shown to generate neural correlates of complex psychophysical phenomena in different sensory systems.Methodology/Principal Findings
Here it is shown that the most cost-effective architectures for these networks produce correlates of electrophysiological brain phenomena and predict major aspects of the anatomical structure and physiological organization of the neocortex. The logic circuits are markedly efficient in several respects and provide the foundation for all of the brain''s combinational processing of information.Conclusions/Significance
At the local level, these networks account for much of the physical structure of the neocortex as well its organization of synaptic connections. Electronic implementations of the logic circuits may be more efficient than current electronic logic arrays in generating both Boolean and fuzzy logic. 相似文献15.
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How do circadian pacemaker neurons provide timekeeping signals by which daily rhythms are organized? Recent technological innovations in the fruitfly model system have allowed observations which suggest some important synchronizing signals may themselves not be gated. 相似文献
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白介素31(IL-31)是一种新型T细胞衍生的细胞因子,其功能受体复合物是由IL-31RA/GPL/GLM-R和OSMR组成的异二聚体。它们在过敏性和非过敏性疾病中起重要作用。 相似文献
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