期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.218103
关键词
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资金
- NASA [NNX08AE09G]
- NSF [DMR-1006546]
- Harvard MRSEC [DMR-0820484]
- NVIDIA
- NASA [102234, NNX08AE09G] Funding Source: Federal RePORTER
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [820484, 1006546] Funding Source: National Science Foundation
We introduce confocal differential dynamic microscopy (ConDDM), a new technique yielding information comparable to that given by light scattering but in dense, opaque, fluorescent samples of micron-sized objects that cannot be probed easily with other existing techniques. We measure the correct wave vector q-dependent structure and hydrodynamic factors of concentrated hard-sphere-like colloids. We characterize concentrated swimming bacteria, observing ballistic motion in the bulk and a new compressed-exponential scaling of dynamics, and determine the velocity distribution; by contrast, near the coverslip, dynamics scale differently, suggesting that bacterial motion near surfaces fundamentally differs from that of freely swimming organisms.
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