排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
在气轨上测量了微小阻力和速度的关系.通过振动能准静态衰减的假设建模,并利用一种改进的线性拟合方法做数值微分,最终在3台气轨上得出了一致的经验规律:f(v)=αvγ,其中γ≈1.30. 相似文献
2.
A population-level model from the microscopic dynamics in Escherichia coli chemotaxis via Langevin approximation
下载免费PDF全文

Recent extensive studies of Escherichia coli (E. coli) chemotaxis have achieved a deep understanding of its mi- croscopic control dynamics. As a result, various quantitatively predictive models have been developed to describe the chemotactic behavior of E. coli motion. However, a population-level partial differential equation (PDE) that rationally incorporates such microscopic dynamics is still insufficient. Apart from the traditional Keller-Segel (K-S) equation, many existing population-level models developed from the microscopic dynamics are integro-PDEs. The difficulty comes mainly from cell tumbles which yield a velocity jumping process. Here, we propose a Langevin approximation method that avoids such a difficulty without appreciable loss of precision. The resulting model not only quantitatively repro- duces the results of pathway-based single-cell simulators, but also provides new inside information on the mechanism of E. coli chemotaxis. Our study demonstrates a possible alternative in establishing a simple population-level model that allows for the complex microscopic mechanisms in bacterial chemotaxis. 相似文献
3.
1