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pubmed-article:9405630pubmed:abstractTextA cell of the bacterium Escherichia coli was tethered covalently to a glass coverslip by a single flagellum, and its rotation was stopped by using optical tweezers. The tweezers acted directly on the cell body or indirectly, via a trapped polystyrene bead. The torque generated by the flagellar motor was determined by measuring the displacement of the laser beam on a quadrant photodiode. The coverslip was mounted on a computer-controlled piezo-electric stage that moved the tether point in a circle around the center of the trap so that the speed of rotation of the motor could be varied. The motor generated approximately 4500 pN nm of torque at all angles, regardless of whether it was stalled, allowed to rotate very slowly forwards, or driven very slowly backwards. This argues against models of motor function in which rotation is tightly coupled to proton transit and back-transport of protons is severely limited.lld:pubmed
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pubmed-article:9405630pubmed:authorpubmed-author:BergH CHClld:pubmed
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pubmed-article:9405630pubmed:pagination14433-7lld:pubmed
pubmed-article:9405630pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:9405630pubmed:articleTitleAbsence of a barrier to backwards rotation of the bacterial flagellar motor demonstrated with optical tweezers.lld:pubmed
pubmed-article:9405630pubmed:affiliationDepartment of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.lld:pubmed
pubmed-article:9405630pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:9405630pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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