Qing-Feng Wang

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The Rcs phosphorelay is a multicomponent signaling system that positively regulates colanic acid synthesis and negatively regulates motility and virulence. We have exploited a spontaneously isolated mutant, IgaA(T191P), that is nearly maximally activated for the Rcs system to identify a vast set of genes that respond to the stimulation, and we report new(More)
Swarming is a specialized form of surface motility displayed by several flagellated bacterial genera, which shares features with other surface phenomenon such as biofilm formation and host invasion. Swarmer cells are generally more flagellated and longer than vegetative cells of the same species propagated in liquid media, and move within an encasement of(More)
Swarming bacteria move in multicellular groups and exhibit adaptive resistance to multiple antibiotics. Analysis of this phenomenon has revealed the protective power of high cell densities to withstand exposure to otherwise lethal antibiotic concentrations. We find that high densities promote bacterial survival, even in a nonswarming state, but that the(More)
Osteosarcoma (OS) is the most common bone malignancy worldwide. The vascular endothelial growth factor (VEGF) gene plays an important role in the pathogenesis of OS. The objective of this study aimed to detect the potential association between VEGF genetic polymorphisms and OS susceptibility in Chinese Han population. We recruited 330 OS patients and 342(More)
We hypothesize interactions among plants for pollination may depend on pollinator abundance, which always varies among years and habitats and has different effects on plant reproductive success. Honeybee-pollinated plants, Lotus corniculatus, and its commonly coflowering neighbor, Potentilla reptans var. sericophylla, were used in a two-year project. We(More)
Available resources could influence the trade-offs among different reproductive components in plants. Here, we created three nutrient levels to test the nutrient effects on trade-offs among sexual reproduction, clonal propagation and vegetative growth in a monoecious clonal herb Sagittaria pygmaea. The results of this study showed that the plant exhibited(More)
Sagittaria trifolia L. is a perennial, erect herb that is confined to ponds, rice fields, ditches, and freshwater wetlands. Using chloroplast DNA (cpDNA) atpB-rbcL intergenic spacer sequences, we studied the phylogeographic pattern and demographic history of S. trifolia with 108 samples from 42 populations representing the entire geographic range in China.(More)
We have uncovered a new role for the bacterial flagellum in sensing external wetness. An investigation into why mutants in the chemotaxis signaling pathway of Salmonella typhimurium exhibit fewer and shorter flagella than wild-type when propagated on a surface, first showed that the mutants downregulate only a small set of genes on swarm media--class 3 or(More)
Secondary brain injury plays a pivotal role in the outcome of patients suffering from traumatic brain injury (TBI). The mechanisms underlying secondary brain injury are complex and interrelated. Previous studies focused on one of these mechanisms have been proved to be ineffective in clinical practice. Therefore, a target, which can interrupt(More)
Polycyclic aromatic hydrocarbons (PAHs) are common contaminants in a municipal solid waste (MSW) composting site. Knowledge of changes in microbial structure is useful to identify particular PAH degraders. However, the microbial community in the MSW composting soil and its change associated with prolonged exposure to PAHs and subsequent biodegradation(More)