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Plasmid-mediated quinolone resistance (PMQR) determinants were widely distributed among Enterobacteriaceae. The objectives of the present study were to analyze PMQR-positive Escherichia coli isolates from pigs, and to investigate the association between these determinants and other resistant genes. A total of 129 porcine E. coli isolates were included in(More)
A multidrug resistance gene, cfr, and a phenicol resistance gene, fexA, were detected in a Bacillus strain, BS-01, isolated from swine feces. The cfr gene was carried on a novel 16.5-kb plasmid, designated pBS-01. A complete Tn917 structure, which harbors the macrolide-lincosamide-streptogramin B resistance gene erm(B), was located downstream of the cfr(More)
Mycoplasma gallisepticum is a major etiological agent of chronic respiratory disease (CRD) in chickens and sinusitis in turkeys. The pleuromutilin antibiotics tiamulin and valnemulin are currently used in the treatment of M. gallisepticum infection. We studied the in vitro development of pleuromutilin resistance in M. gallisepticum and investigated the(More)
Small nucleolar RNAs (snoRNAs) are an abundant group of noncoding RNAs mainly involved in the posttranscriptional modifications of rRNAs in eukaryotes. Prior to this study, only 28 snoRNA genes had been identified from Caenorhabditis elegans, indicating that most snoRNA genes are hidden in the worm genome, which represents a simple multicellular metazoan.(More)
Escherichia coli is a common commensal bacterium and is regarded as a good indicator organism for antimicrobial resistance for a wide range of bacteria in the community and on farms. Antimicrobial resistance of E. coli isolated from chickens from 49 farms in China between 2001 and 2006 was studied. A total of 536 E. coli isolates were collected, and minimal(More)
We propose a kind of plasmonic whispering-gallery mode highly localized on the exterior surface of a metal-coated microresonator. This exterior (EX) surface mode possesses high quality factors at room temperature, and can be efficiently excited by a tapered fiber. The EX mode can couple to an interior (IN) mode and this coupling produces a strong(More)
A new label-free sensing mechanism is demonstrated experimentally by monitoring the whispering-gallery mode broadening in microcavities. It is immune to both noise from the probe laser and environmental disturbances, and is able to remove the strict requirement for ultra-high-Q mode cavities for sensitive nanoparticle detection. This ability to sense(More)
Ultrasensitive nanoparticle detection holds great potential for early-stage diagnosis of human diseases and for environmental monitoring. In this work, we report for the first time, to our knowledge, single nanoparticle detection by monitoring the beat frequency of split-mode Raman lasers in high-Q optical microcavities. We first demonstrate this method by(More)
In this paper, we propose a novel image denoising algorithm in Contourlet domain. The Contourlet transform is adopted by virtual of its advantages over the Wavelet transform in order to obtain a flexible multiresolution, local, and directional image expansion using contour segments, it is good at isolating the smoothness along the contours. We present a(More)