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Search Results: 1 - 10 of 34418 matches for " Daoguo Zhou "
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Global Regularity for the Two-dimensional Boussinesq Equations Without Diffusivity in Bounded Domains
Daoguo Zhou
Mathematics , 2015,
Abstract: We address the well-posedness for the two-dimensional Boussinesq equations with zero diffusivity in bounded domains. We prove global in time regularity for rough initial data: the initial velocity has $\epsilon$ fractional derivatives in $L^q$ for some $q>2$ and $\epsilon>0$ arbitrarily small, and the initial temperature is in $H^1$.
SipB-SipC Complex Is Essential for Translocon Formation
Sebenzile K. Myeni, Lu Wang, Daoguo Zhou
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0060499
Abstract: The delivery of effector proteins by Salmonella across the host cell membrane requires a subset of effectors secreted by the type III secretion system (TTSS) known as translocators. SipC and SipB are translocator proteins that are inserted into host membranes and presumably form a channel that translocates type III effectors into the host cell. The molecular events of how these translocators insert into the host cell membrane remain unknown. We have previously shown that the SipC C-terminal amino acid region (321–409) is required for the translocation of effectors into host cells. In this study, we demonstrate that the ability to form SipC-SipB complex is essential for their insertion into the host membrane. The SipB-interacting domain of SipC is near its C-terminal amino acid region (340–409). In the absence of SipB, SipC was not detected in the membrane fraction. Furthermore, SipC mutants that no longer interact with SipB are defective in inserting into the host cell membrane. We propose a mechanism whereby SipC binds SipB through its C-terminal region to facilitate membrane-insertion and subsequent translocon formation in the host cell membrane.
Involvement of TIP60 acetyltransferase in intracellular Salmonella replication
Xueqin Wang, Dongju Li, Di Qu, Daoguo Zhou
BMC Microbiology , 2010, DOI: 10.1186/1471-2180-10-228
Abstract: In an attempt to identify host proteins that interact with SseF, we conduct a yeast two-hybrid screening of human cell cDNA library using SseF as the bait. We identified that TIP60, an acetyltransferase, interacts with SseF. We showed that the TIP60 acetylation activity was increased in the presence of SseF, and TIP60 was upregulated upon Salmonella infection. In addition, TIP60 is required for efficient intracellular Salmonella replication in macrophages.Taken together, our data suggest that Salmonella may use SseF to exploit the host TIP60 acetyltransferase activity to promote efficient Salmonella replication inside host cells.Protein acetylation adds the acetyl group on either the amino-terminal residues or on the epsilon-amino group of lysine residues. Lysine acetylation affects many protein functions, including DNA binding, protein-protein interactions, and protein stability. TIP60 catalyzes histone acetylation [1,2]. It was originally identified as a cellular acetyltransferase protein that interacts with HIV-1 Tat [3]. Over-expression of TIP60 increased Tat transactivation of the HIV-1 promoter [3]. Recent studies found that TIP60 has diverse functions involved in transcription, cellular signaling, DNA damage repair, cell cycle checkpoint control and apoptosis [2,4,5].Salmonella enterica serovar Typhimurium (S. typhimurium) causes gastrointestinal diseases in humans and typhoid-like fever in the mouse. S. typhimurium encodes two Type III secretion systems within the Salmonella pathogenicity islands 1 and 2 (SPI-1 and SPI-2) that are required for Salmonella entry and subsequent survival inside the host cells, respectively [6-10]. Following entry into the host cells, S. typhimurium replicates within a membrane-bound compartment termed Salmonella-containing vacuole (SCV). Previous studies have shown that SifA, SseF and SseG are involved in the formation of Salmonella induced filaments (Sifs) that are required for maintaining the SCV [11-13].SseF, working together
The EHEC Type III Effector NleL Is an E3 Ubiquitin Ligase That Modulates Pedestal Formation
Heather Piscatelli,Shalaka A. Kotkar,Megan E. McBee,Sureshkumar Muthupalani,David B. Schauer,Robert E. Mandrell,John M. Leong,Daoguo Zhou
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019331
Abstract: Enterohemorrhagic Escherichia coli (EHEC) O157:H7 causes hemorrhagic colitis and may result in potentially fatal hemolytic uremia syndrome in humans. EHEC colonize the intestinal mucosa and promote the formation of actin-rich pedestals via translocated type III effectors. Two EHEC type III secreted effectors, Tir and EspFu/TccP, are key players for pedestal formation. We discovered that an EHEC effector protein called Non-LEE-encoded Ligase (NleL) is an E3 ubiquitin ligase. In vitro, we showed that the NleL C753 residue is critical for its E3 ligase activity. Functionally, we demonstrated that NleL E3 ubiquitin ligase activity is involved in modulating Tir-mediated pedestal formation. Surprisingly, EHEC mutant strain deficient in the E3 ligase activity induced more pedestals than the wild-type strain. The canonical EPEC strain E2348/69 normally lacks the nleL gene, and the ectopic expression of the wild-type EHEC nleL, but not the catalytically-deficient nleL(C753A) mutant, in this strain resulted in fewer actin-rich pedestals. Furthermore, we showed that the C. rodentium NleL homolog is a E3 ubiquitin ligase and is required for efficient infection of murine colonic epithelial cells in vivo. In summary, our study demonstrated that EHEC utilizes NleL E3 ubiquitin ligase activity to modulate Tir-mediated pedestal formation.
Thermal analysis of LED lighting system with different fin heat sinks

Hou Fengze,Yang Daoguo,Zhang Guoqi,

半导体学报 , 2011,
Separation of Static and Dynamic Principal Stress by the Combined Photo-carrier Methad

Cao Hongsheng Yang Daoguo,

实验力学 , 1990,
Abstract: By means of the suggested combined photo-carrier method, an isochromatic carrier fringe pattern and a combined isopachic-isochromatic carrier pattern can be obtained simultaneously. Then, the isopachic carrier fringes are extracted from the combined carrierfringe pattern by spatially filtering technique. From the two separate carrier fringe patterns, the automatic image processing may finally complete the separation of principal stresses. By applying the method to the dynamic holographic photoelasticity, the dynamic principal stresses can also be separated. A simple and practical technique for making a large size birefringent carrier plate is described.
Development Status, Problems and Countermeasures of Large- and Intermediate-Scale Biogas Projects in Beijing’s Mountainous Counties  [PDF]
Zhongren Zhou, Zhujun Zhou
Journal of Power and Energy Engineering (JPEE) , 2013, DOI: 10.4236/jpee.2013.15010
Abstract: Developing large- and intermediate-scale biogas project is an important gripper ofBeijingrural energy construction and “Green Beijing” construction. The existing projects have made obvious energy and environment benefits, but the overall effects have not been fully exerted. There is still a large gap betweenBeijing’s ecological civilization goal and the operation effect. This paper takes biogas projects ofBeijingseven mountainous counties as examples, the development status, ecological environment construction and existing problems of operating are explained respectively. Finally, some countermeasures and suggestions are proposed for promoting the sustainable development of biogas project inBeijing, such as strengthening technical innovation and setting standards, innovating development patterns and planning reasonable layout, improve the maintenance mechanism and intensify policy support.
An oversampling system for ECG acquisition  [PDF]
Yu Zhou
Journal of Biomedical Science and Engineering (JBiSE) , 2009, DOI: 10.4236/jbise.2009.27075
Abstract: Traditional ECG acquisition system lacks for flexibility. To improve the flexibility of ECG acquisition system and the signal-to-noise ratio of ECG, a new ECG acquisition system was designed based on DAQ card and Labview and oversampling was implemented in Labview. And analog signal conditioning circuit was improved on. The result indicated that the system could detect ECG signal accurately with high signal-to-noise ratio and the signal processing methods could be adjusted easily. So the new system can satisfy many kinds of ECG acquisition. It is a flexible experiment platform for exploring new ECG acquisition methods.
The Structure of Reflective Function of Higher Dimensional Differential System  [PDF]
Zhengxin Zhou
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.11009
Abstract: In this article, we discuss the structure of reflective function of the higher dimensional differential systems and apply the results to study the existence of periodic solutions of these systems.
Towards Capability Maturity Model of e-Learning Process  [PDF]
Yong Zhou
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.44015
Abstract: ePCMM (e-Learning Process Capability Maturity Model) is used for evaluating the capability and maturity of an institution engaged in e-Learning based on e-Learning key process areas. It is a stepwise process improvement which can be implemented by both staged model and continues model.
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