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Mechanical energy levers

Examining these structures and the fact that they are all powered by ATP, the question remains as to how force is actually produced. Geeves and Holmes (2005) argue that myosin acts by the specific coupling between different myosin head states and different positions of the lever arm on the motor domain, so that, once attached to actin, the myosin acts as an ATP-driven motor where the energy released by ATP hydrolysis is direcdy coupled to the performance of mechanical work. However, Marx et al. (2005) argue that in some cases the kinesins appear to act as thermal ratchets. In this case, the attachment of a second head, once the first head has bound, is an event controlled by thermal motion, but, presumably for steric reasons, the head is more likely to bind to the microtubule in the... [Pg.11]

Now comes the interesting question How do we make such a tiny mechanism I leave that to you. However, let me suggest one weird possibility. You know, in the atomic energy plants they have materials and machines that they can t handle directly because they have become radioactive. To unscrew nuts and put on bolts and so on, they have a set of master and slave hands, so that by operating a set of levers here. [Pg.448]

Insight into the assignment of redox transitions can be gained from quantum mechanical calculations, which can help correlate the energies of the empty and occupied orbitals with the onsets of reduction and oxidation of specific redox active species. Lever and coworkers have pointed out that for many metal phthalocyanines for which the metal lies in the plane of the ring, the difference in the magnitude of the... [Pg.200]

Energy transfers from one side of the fulcrum to the other. The amount of mechanical advantage is based on the ratio of the length of the lever on each side of the fulcrum. [Pg.220]

Other effective mechanical amplifying systems are also used for connecting semi-active and active dampers in order to reduce the control forces and the energy required for activation of control devices (Gluck, 2000, Ribakov, 2000). In this study efficiency of lever arm amplifiers for connection of active controlled devices is studied. First optimal locations of control devices are obtained. The amplifiers are used for further decreasing the number of control devices at each floor. [Pg.241]

Zero Mechanical State The mechanical potential energy of all portions of the machine or equipment at its lowest practical value so that the opening of the pipe(s), tube(s), hose(s), or actuation of any valve, lever, or button will not produce a movement that could cause injury. [Pg.69]


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See also in sourсe #XX -- [ Pg.785 ]




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