Fig.1. A schematic diagram of the optical setup (top); A photograph of part of the setup (bottom left); The duty ratio was determined to be 1 (bottom right).
During the last 20 years, multiple experiments have been carried out to measure the duty ratio, which inspired multiple theoretical models of the motor dynamics. However, due to technical limitations, it was previously impossible to measure the number of stators for motors under zero-load precisely. This made it difficult to determine the duty ratio conclusively. Therefore, it was a long-standing controversy experimentally and theoretically regarding the value of the duty ratio. The group led by Profs. Yuan & Zhang developed a novel technique combining bright-field microscopy, laser dark-field microscopy, and optical trapping to resolve this controversy. They found that the zero-load speed is independent of the number of stators for the flagellar motor in E. coli, demonstrating conclusively that the stators have a duty ratio close to 1.
This work was supported by National Natural Science Foundation of China, the Ministry of Science and Technology of China, and Fundamental Research Funds for the Central Universities. Prof.s YUAN Junhua and ZHANG Rongjing are supported by the "1000 Youth Talent Program".
Prof. YUAN Junhua, firstname.lastname@example.org
Prof. ZHANG Rongjing, email@example.com
(School of Physical Sciences, Hefei National Laboratory for Physical Sciences at the Microscale)
On May 11, the Nature Publishing Group released Nature Publishing Index 2010 China, remarking “a dramatic rise in the quality of research being published by China”. University of Science and Technology of China is ranked 3rd of TOP 10 Institutions in Index 2010 China.
This article came from News Center of USTC.