Transport Theory and Statistical Physics最新文献

Whole lifecycle observation of single-spore germinated Streptomyces using a nanogap-stabilized microfluidic chip. 利用纳米间隙稳定微流控芯片对单孢发芽链霉菌的整个生命周期进行观察。

IF 5.4

Transport Theory and Statistical Physics Pub Date : 2022-09-24 eCollection Date: 2022-09-01 DOI: 10.1002/mlf2.12039

Dongwei Chen, Mengyue Nie, Wei Tang, Yuwei Zhang, Jian Wang, Ying Lan, Yihua Chen, Wenbin Du

{"title":"Whole lifecycle observation of single-spore germinated Streptomyces using a nanogap-stabilized microfluidic chip.","authors":"Dongwei Chen, Mengyue Nie, Wei Tang, Yuwei Zhang, Jian Wang, Ying Lan, Yihua Chen, Wenbin Du","doi":"10.1002/mlf2.12039","DOIUrl":"10.1002/mlf2.12039","url":null,"abstract":"Streptomyces is a model bacterium to study multicellular differentiation and the major reservoir for antibiotics discovery. However, the cellular-level lifecycle of Streptomyces has not been well studied due to its complexity and lack of research tools that can mimic their natural conditions. In this study, we developed a simple microfluidic chip for the cultivation and observation of the entire lifecycle of Streptomyces development from the single-cell perspective. The chip consists of channels for loading samples and supplying nutrients, microwell arrays for the seeding and growth of single spores, and air chambers beside the microwells that facilitate the development of aerial hyphae and spores. A unique feature of this chip is that each microwell is surrounded by a 1.5 µm nanogap connected to an air chamber, which provides a stabilized water-air interface. We used this chip to observe the lifecycle development of Streptomyces coelicolor and Streptomyces griseus germinated from single spores, which revealed differentiation of aerial hyphae with progeny spores at micron-scale water-air interfaces and air chambers. Finally, we demonstrated the applicability of this chip in phenotypic assays by showing that the microbial hormone A-Factor is involved in the regulatory pathways of aerial hyphae and spore formation. The microfluidic chip could become a robust tool for studying multicellular differentiation, single-spore heterogeneity, and secondary metabolism of single-spore germinated Streptomyces.","PeriodicalId":49420,"journal":{"name":"Transport Theory and Statistical Physics","volume":"14 1","pages":"341-349"},"PeriodicalIF":5.4,"publicationDate":"2022-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10989842/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80930369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial Board EOV 编辑委员会EOV

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2013.941269

引用次数: 0

Rigorous Asymptotic and Moment-Preserving Diffusion Approximations for Generalized Linear Boltzmann Transport in Arbitrary Dimension 任意维广义线性玻尔兹曼输运的严格渐近和保矩扩散近似

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.910231

Eugene d'Eon

{"title":"Rigorous Asymptotic and Moment-Preserving Diffusion Approximations for Generalized Linear Boltzmann Transport in Arbitrary Dimension","authors":"Eugene d'Eon","doi":"10.1080/00411450.2014.910231","DOIUrl":"https://doi.org/10.1080/00411450.2014.910231","url":null,"abstract":"We derive new diffusion solutions to the monoenergetic generalized linear Boltzmann transport equation for the stationary collision density and scalar flux about an isotropic point source in an infinite d-dimensional absorbing medium with isotropic scattering. We consider both classical transport theory with exponentially distributed free paths in arbitrary dimensions as well as a number of nonclassical transport theories (nonexponential random flights) that describe a broader class of transport processes within partially correlated random media. New rigorous asymptotic diffusion approximations are derived where possible. We also generalize Grosjean’s moment-preserving approach of separating the first (or uncollided) distribution from the collided portion and approximating only the latter using diffusion. We find that for any spatial dimension and for many free-path distributions Grosjean’s approach produces compact, analytic approximations that are, overall, more accurate for high absorption and for small source-detector separations than either P1 diffusion or rigorous asymptotic diffusion. These diffusion-based approximations are exact in the first two even spatial moments, which we derive explicitly for various nonclassical transport types. We also discuss connections between the random-flight-theory derivation of the Green’s function and the discrete spectrum of the transport operator and report some new observations regarding the discrete eigenvalues of the transport operator for general dimensions and free-path distributions.","PeriodicalId":49420,"journal":{"name":"Transport Theory and Statistical Physics","volume":"42 1","pages":"237 - 297"},"PeriodicalIF":0.0,"publicationDate":"2013-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00411450.2014.910231","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58910216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

A Comparison of Moment Closures for Linear Kinetic Transport Equations: The Line Source Benchmark 线性动力学输运方程矩闭包的比较:线源基准

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.910226

C. Garrett, C. Hauck

引用次数: 64

Three-Dimensional Inverse Transport Solver Based on Compressive Sensing Technique 基于压缩感知技术的三维逆向传输求解器

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.919324

Y. Cheng, Hongchun Wu, Liangzhi Cao, Youqi Zheng

{"title":"Three-Dimensional Inverse Transport Solver Based on Compressive Sensing Technique","authors":"Y. Cheng, Hongchun Wu, Liangzhi Cao, Youqi Zheng","doi":"10.1080/00411450.2014.919324","DOIUrl":"https://doi.org/10.1080/00411450.2014.919324","url":null,"abstract":"According to the direct exposure measurements from flash radiographic image, a compressive sensing-based method for three-dimensional inverse transport problem is presented. The linear absorption coefficients and interface locations of objects are reconstructed directly at the same time. It is always very expensive to obtain enough measurements. With limited measurements, compressive sensing sparse reconstruction technique orthogonal matching pursuit is applied to obtain the sparse coefficients by solving an optimization problem. A three-dimensional inverse transport solver is developed based on a compressive sensing-based technique. There are three features in this solver: (1) AutoCAD is employed as a geometry preprocessor due to its powerful capacity in graphic. (2) The forward projection matrix rather than Gauss matrix is constructed by the visualization tool generator. (3) Fourier transform and Daubechies wavelet transform are adopted to convert an underdetermined system to a well-posed system in the algorithm. Simulations are performed and numerical results in pseudo-sine absorption problem, two-cube problem and two-cylinder problem when using compressive sensing-based solver agree well with the reference value.","PeriodicalId":49420,"journal":{"name":"Transport Theory and Statistical Physics","volume":"42 1","pages":"345 - 363"},"PeriodicalIF":0.0,"publicationDate":"2013-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00411450.2014.919324","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58910515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Optical Properties of CdSe/ZnS Core/Shell Quantum Dot Embedded in an MEH-PPV Polymer Matrix 嵌入MEH-PPV聚合物基体的CdSe/ZnS核壳量子点光学性质研究

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.922481

Issam Hemdana, M. Mahdouani, R. Bourguiga

引用次数: 1

Comparing Two Opacity Models in Monte Carlo Radiative Heat Transfer: Computational Efficiency and Parallel Load Balancing 蒙特卡罗辐射传热中两种不透明模型的比较:计算效率和并行负载平衡

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.912058

M. Cleveland, T. Palmer

引用次数: 0

Existence and Stability Results for Second-Order Stochastic Equations Driven by Fractional Brownian Motion 分数阶布朗运动驱动二阶随机方程的存在性和稳定性结果

Transport Theory and Statistical Physics Pub Date : 2013-09-19 DOI: 10.1080/00411450.2014.910813

P. Revathi, R. Sakthivel, Dae-Yup Song, Yong Ren, Pei Zhang

引用次数: 9

Phonon Transport in Silicon Thin Film: Effect of Temperature Oscillation on Effective Thermal Conductivity 硅薄膜中的声子输运:温度振荡对有效导热系数的影响

Transport Theory and Statistical Physics Pub Date : 2013-06-07 DOI: 10.1080/00411450.2014.886593

S. Bin Mansoor, B. Yilbas

{"title":"Phonon Transport in Silicon Thin Film: Effect of Temperature Oscillation on Effective Thermal Conductivity","authors":"S. Bin Mansoor, B. Yilbas","doi":"10.1080/00411450.2014.886593","DOIUrl":"https://doi.org/10.1080/00411450.2014.886593","url":null,"abstract":"In this article, we consider phonon transport in thin silicon film and examine the influence of temporal oscillation of the temperature heat source on the phonon transport. We solve the frequency-dependent transient two-dimensional Boltzmann equation numerically to observe the quasi-ballistic effects of the phonons on the film effective thermal conductivity. Temperature oscillation at different periods is incorporated at the bottom face of the film as a heat source. The size of the temperature source is varied by introducing the spatial Gaussian distribution along this face. In order to assess the phonon distribution in the film, we introduce the equivalent equilibrium temperature. We determine the effective thermal conductivity of the film and analyze its variation due to the different periods of the temperature oscillation and the Gaussian parameters. It is found that reducing the period of the temperature oscillation lowers the effective thermal conductivity of the film, which is more pronounced for low Gaussian parameters. In this case, the quasi-ballistic behavior of phonons contributes adversely to the effective thermal conductivity of the film.","PeriodicalId":49420,"journal":{"name":"Transport Theory and Statistical Physics","volume":"42 1","pages":"179 - 201"},"PeriodicalIF":0.0,"publicationDate":"2013-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/00411450.2014.886593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58910495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Stability of the Essential Spectrum for Singular Transport Semigroups with Periodic Boundary Conditions 具有周期边界条件的奇异输运半群本质谱的稳定性

Transport Theory and Statistical Physics Pub Date : 2013-06-07 DOI: 10.1080/00411450.2014.886592

Peng Zhao, Jun-guo Jia, Meng Xu

引用次数: 0