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#29036988   2017/10/17 Save this To Up

[Characteristics of molecular typing and drug resistance of 67 Salmonella paratyphi A isolated in Zhengzhou from 2013 to 2015].

Objective: To investigate the antimicrobial resistance and pulsed field gel electrophoresis (PFGE) patterns of S.paratyphi A strains in Zhengzhou city isolated from sentinel hospitals in 2013-2015. Methods: According to Salmonella molecular typing and K-B drug susceptibility testing method published by international PulseNet bacterial infectious disease monitoring network and USA Clinical and Laboratory Standards Institute (CLSI2015), we analyzed drug sensitivity and PFGE molecular characteristics of 67 S.paratyphi A strains(11 strains in 2013, 7 strains in 2014, 49 strains in 2015) isolated from blood and stool samples in two sentinel hospitals of fever with rash syndrome surveillance system established in Zhengzhou city in 2013-2015. Results: The results showed 67 strains of S.paratyphi A had different levels of resistance to 13 kinds of antibiotics, 65 strains were multi-drug resistant strains (97.0%), 5 isolates were resistant to 2-3 kinds of antibiotics (7.5%), 41 isolates were resistant to 5-8 kinds of antibiotics (61.2%),11 isolates were resistant to 9-10 kinds of antibiotics(16.4%),8 isolates were resistant to 11-12 kinds of antibiotics(11.9%). 67 strains of S.paratyphi A were divided into 10 molecular patterns(PTYA1-PTYA10) by digestion with XbaⅠ restriction endonuclease and pulsed field gel electrophoresis, each pattern contains 1-48 strains with similarity ranged from 94.31%-100%. PTYA3 contained 48 strains, which was predominant band type; PTYA1, 9 contained 6 strains; PTYA 2, 4, 5, 6, 7, 8, 10 contained 1 strains among them. Conclusion: The status of drug resistance of clinical isolates of S.paratyphi A in Zhengzhou city was rather serious, PFGE patterns showed diversity and dominant characteristics. The PFGE patterns of partial strains and its corresponding anti-drug spectrum have certain relevance and cluster relationship.

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#28743033   2017/07/25 Save this To Up

Analysis of the genetic structure of the Malay population: Ancestry-informative marker SNPs in the Malay of Peninsular Malaysia.

Malay, the main ethnic group in Peninsular Malaysia, is represented by various sub-ethnic groups such as Melayu Banjar, Melayu Bugis, Melayu Champa, Melayu Java, Melayu Kedah Melayu Kelantan, Melayu Minang and Melayu Patani. Using data retrieved from the MyHVP (Malaysian Human Variome Project) database, a total of 135 individuals from these sub-ethnic groups were profiled using the Affymetrix GeneChip Mapping Xba 50-K single nucleotide polymorphism (SNP) array to identify SNPs that were ancestry-informative markers (AIMs) for Malays of Peninsular Malaysia. Prior to selecting the AIMs, the genetic structure of Malays was explored with reference to 11 other populations obtained from the Pan-Asian SNP Consortium database using principal component analysis (PCA) and ADMIXTURE. Iterative pruning principal component analysis (ipPCA) was further used to identify sub-groups of Malays. Subsequently, we constructed an AIMs panel for Malays using the informativeness for assignment (In) of genetic markers, and the K-nearest neighbor classifier (KNN) was used to teach the classification models. A model of 250 SNPs ranked by In, correctly classified Malay individuals with an accuracy of up to 90%. The identified panel of SNPs could be utilized as a panel of AIMs to ascertain the specific ancestry of Malays, which may be useful in disease association studies, biomedical research or forensic investigation purposes.

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#27998412   2016/12/21 Save this To Up

[Molecular typing of Salmonella isolates from poultry production chains in four cities of Heilongjiang province].

Objective: To study the PFGE type of Salmonella (S.) strains isolated from poultry production chains (hatching, breeding, slaughter, distribution and retail) of four cities in Heilongjiang province. Methods: DNA collected from S. strains in 2012 was digested by XbaⅠ according to the standard PFGE protocol of US CDC. The PFGE patterns were then analyzed by BioNumerics software. Results: The contamination of S. appeared most serious during the process of slaughtering (13.84%). PFGE was used to determine the genetic relationships between these isolates from poultry production chains, 89 pulsotypes from 150 S. enteritidis isolates and 55 pulsotypes from 65 S. indiana isolates showed considerable diversity. The same pulsotypes of S. enteritidis can be found between different food chains and cities. In contrast, no identical pulsotypes of S. indiana were found between different food chain and cities. In these four cities, the above said two kinds of S. were from different sources. The source of S. contamination in HLJ2 city had been traced back to the chain of poultry hatching. Conclusions: The distribution of pulsetypes of the S. enteritidis and S. indiana isolates was from different regions and the dominant bands were also different between the chains of poultry production. Cross contamination existed in slaughterhouses and contamination can be traced back to the poultry hatching.

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#27765134   2016/10/21 Save this To Up

[Distribution and molecular type of Salmonella from external environment in Henan province].

Objective: To understand the distribution of Salmonella in external environment in Henan province, and explore the distribution of different serotypes of the Salmonella and their homology. Methods: A total of 4 488 samples were collected form animal dung, meat products and kitchen utensils, and identified by biochemical tests and serotyped by serum agglutination reaction. The predominant serotypes were further typed by PFGE. Results: A total of 324 Salmonella strains were detected in these samples, the detection rate was 7.21%. The 324 Salmonella isolates belonged to 39 serotypes, S. enteritidis (24.07%, 78/324) and S. derby (20.37%, 66/324) were predominant. Forty six strains of S. enteritidis and 30 strains of S. derby were divided into 12 and 17 molecular patterns by digestion with Xba Ⅰ, while chicken and swine were the predominant animal hosts. Conclusions: Serotyping of external environment Salmonella were phenotypically diverse and the serotype of Salmonella from different sources were different. The same clone was prevalent in same area. It is necessary to strengthen supervision and surveillance to ensure food safety.

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#27616784   2016/09/12 Save this To Up

Do Processing Patterns of Strengths and Weaknesses Predict Differential Treatment Response?

No previous empirical study has investigated whether the LD identification decisions of proposed methods to operationalize processing strengths and weaknesses (PSW) approaches for LD identification are associated with differential treatment response. We investigated whether the identification decisions of the concordance/discordance model (C/DM; Hale & Fiorello, 2004) and Cross Battery Assessment approach (XBA method; Flanagan, Ortiz, & Alfonso, 2007) were consistent and whether they predicted intervention response beyond that accounted for by pretest performance on measures of reading.

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#29019216   2017/10/11 Save this To Up

[An XcmⅠ-generated T vector and its applications in synthetic biology].

For more economical and efficient DNA clonging, pFL-XS-T, a Biobrick-T vector was constructed based on pMD18-T vector, carrying clonging regions of XbaⅠ-XcmⅠ-XcmⅠ-SpeⅠ. The results revealed that PCR products could be conveniently inserted into pFL-XS-T vevtor digested by XcmⅠby means of TA cloning. The positive frequency of recombination can meet the experimental requirements and all the plasmids obtained meet Biobrick standard. Moreover, the pFL-XS-T is compatible with other Biobrick parts, and serves as a vector for functional DNA fragments screening.

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#27399961   2016/07/11 Save this To Up

Estrogen receptor gene polymorphism in patients with degenerative lumbar scoliosis.

To examine the association between development of degenerative lumbar scoliosis (DLS) and sex hormones.

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#27373080   2016/07/04 Save this To Up

[Isolation and characterization of siphovirus phages infecting bovine Streptococcus agalactiae].

To isolate and identify Streptococcus agalactiae phages and screen candidate phages to control infection caused by bovine S. agalactiae.

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#27256733   2016/06/03 Save this To Up

[The etiological and molecular typing research of diarrheagenic Escherichia coli in Henan province in 2013].

To analyze the distribution and pulsed field gel electrophoresis (PFGE) patterns of five kinds of diarrheagenic Escherichia coli (DEC) in infected diarrhea population of Henan province in 2013.

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#27232723   2016/06/09 Save this To Up

Novel and facile synthesis of Ba-doped BiFeO3 nanoparticles and enhancement of their magnetic and photocatalytic activities for complete degradation of benzene in aqueous solution.

In this work, Bi1-x Bax FeO3 (x=0.05, 0.1 and 0.2mol%) multiferroic materials as visible-light photocatalysts were successfully synthesized via a simple and rapid sol-gel method, at a low temperature and with rapid calcination. Ba loading brought about a distorted structure of BiFeO3 magnetic nanoparticles (BFO MNPs) consisting of small, randomly oriented and non-uniform grains, leading to increased surface area and improved magnetic and photocatalytic activities. Doping of Ba(2+) into pure BFO (Bi1-x Bax FeO3, x=0.2mol%) greatly increased magnetic saturation to 3.0emu/g and significantly decreased the band-gap energy to 1.79eV, as compared to 2.1emu/g and 2.1eV, respectively, for pure BFO. Bi1-xBa xFeO3 of x=0.2mol% exhibited the greatest photocatalytic degradation effect after 60min of visible light irradiation, and reached 97% benzene removal efficiency, leading to production of a high concentration of carbon dioxide (CO2), with 93% and 82% reductions in chemical oxygen demand (COD) and total organic carbon (TOC), respectively. The identified major intermediate products of photodegradation enabled prediction of the proposed benzene degradation pathway. The enhanced photocatalytic activity of benzene removal is due to both mechanisms, photocatalytic and photo-Fenton catalytic degradation.

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