Xinsheng Zhao

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In gram-negative bacteria, the assembly of outer membrane proteins (OMPs) requires a β-barrel assembly machinery (BAM) complex, of which BamA is an essential and evolutionarily conserved component. To elucidate the mechanism of BamA-mediated OMP biogenesis, we determined the crystal structure of the C-terminal transmembrane domain of BamA from Escherichia(More)
Significant studies about Tamarix chinensis as an introduced invasive plant species have been implemented in North America. However, the response of native T. chinensis to its environment is not well known in China. T. chinensis is a useful species in preventing sea water intrusion in coastal areas of northern China. It is necessary to fully understand the(More)
G protein-coupled receptors (GPCRs) activate mitogen-activated protein kinases through a number of distinct pathways in cells. Increasing evidence has suggested that endosomal signaling has an important role in receptor signal transduction. Here we investigated the involvement of endocytosis in α(1A)-adrenergic receptor (α(1A)-AR)-induced activation of(More)
The middle and lower reaches of the Yangtze River basin have the most representative and largest concentration of freshwater lakes in China. However, the size and number of these lakes have changed considerably over the past century due to the natural and anthropogenic impact. The lakes, larger than 10 km(2) in size, were chosen from relief maps and(More)
Hydrogen-terminated Si(111) surfaces are modified by attachment of oligodeoxynucleotides and characterized with respect to DNA surface density, chemical stability, and DNA hybridization binding specificity. Surface functionalization employs the reaction of ω-unsaturated alkyl esters with the Si(111) surface using UV irradiation. Cleavage of the ester using(More)
Stilbazolium dimers were designed and synthesized in which methylene groups of different lengths link the two chromophores. The second-order nonlinear optical property has been detected from their LangmuirBlodgett monolayers. Photocurrent generation as well as other photophysical properties such as absorption and fluorescence were investigated. Comparing(More)
In LTE-A systems, load balancing is one of the key targets of the self-organizing network (SON). This paper proposes a virtual cell-breathing based load balancing (VCBLB) scheme for downlink LTE-A self-optimizing networks. In the proposed load balancing scheme, the coverage of serving cells and neighboring target cells is virtually controlled by adjusting(More)
This paper presents an adaptive frame length mechanism based on a cross-layer analysis of intrinsic relations between the MAC frame length, bit error rate (BER) of the wireless link and normalized goodput. The proposed mechanism selects the optimal frame length that keeps the service normalized goodput at required levels while satisfying the lowest(More)