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RISS 인기검색어
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- 저자 : B. Pfeiffer (검색결과 2 건)
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Calcium Regulation of an Actin Spring
Tam, B.K.,Shin, J.H.,Pfeiffer, E.,Matsudaira, P.,Mahadevan, L. Biophysical Society ; Published for the Biophysica 2009 Biophysical journal Vol.97 No.4
Calcium is essential for many biological processes involved in cellular motility. However, the pathway by which calcium influences motility, in processes such as muscle contraction and neuronal growth, is often indirect and complex. We establish a simple and direct mechanochemical link that shows how calcium quantitatively regulates the dynamics of a primitive motile system, the actin-based acrosomal bundle of horseshoe crab sperm. The extension of this bundle requires the continuous presence of external calcium. Furthermore, the extension rate increases with calcium concentration, but at a given concentration, we find that the volumetric rate of extension is constant. Our experiments and theory suggest that calcium sequentially binds to calmodulin molecules decorating the actin filaments. This binding leads to a collective wave of untwisting of the actin filaments that drives bundle extension.
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Atomic Mass Evaluation: the Mass Tables
G. Audi,M. Wang,A. H. Wapstra,B. Pfeiffer,F. G. Kondev 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The advent of the ``AME-Future" project a year and a half ago rendered the realization of a new mass table possible in the very near future: the Ame2013 mass table. A large number of the new experimental data obtained from different laboratories have already been analyzed. They exhibit important changes in the mass surface. Most of these changes lift the mass surface to higher masses (reduced binding energies). The rise can be explained by previously under-estimated Q_β data of exotic species due to missed levels. Some consequences of this change are expected in calculations using the nuclear masses as one of their ingredients. We will discuss here the expected impact on the nucleo-synthesis r-process path in astrophysics.
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