نتایج جستجو برای: rotating biological contactors
تعداد نتایج: 497840 فیلتر نتایج به سال:
Almost 30 years have passed since the discovery of concentric (target) and spiral waves in the spatially extended Belousov-Zhabotinsky (BZ) reaction. Since then, rotating spirals and target waves have been observed in a variety of physical, chemical, and biological reaction-diffusion systems. All of these waves propagate out from the spiral center or pacemaker. We report observations of inwardl...
Vortices of unusual form (rotating straight lines), phase-rotors, are found to occur in an active medium. Transitions between phase-rotors and Archimedian spiral waves are studied. The role of the dispersion relation in vortex development is discussed. Rotating nonlinear waves in active media have been attracting attention of the researchers during several decades. Such waves are found to occur...
We propose and demonstrate trapping and rotation of microparticles and biological samples with a moiré-based rotating optical tweezers. We show that polystyrene beads, as well as Escherichia coli cells, can be rotated with ease, while the speed and direction of rotation are fully controllable by a computer, obviating mechanical movement or phase-sensitive interference. Furthermore, we demonstra...
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