Some results of modeling D-D seismogenic pattern by the fracture model experiment of large-scale rock samples(I)

sing the natural limestone samples taken from the field with dimension of 500 mm×500 mm×1 000 mm, the D-D (dilatancy-diffusion) seismogeny pattern was modeled under the condition of water injection, which observes the time-space evolutionary features about the relative physics fields of the loaded samples from deformation, formation of microcracks to the occurrence of main rupture. The results of observed apparent resistivity show: ① The process of the deformation from microcrack to main rupture on the loaded rock sample could be characterized by the precursory spatial-temporal changes in the observation of apparent resistivity; ② The precursory temporal changes of observation in apparent resistivity could be divided into several stages, and its spatial distribution shows the difference in different parts of the rock sample; ③ Before the main rupture of the rock sample the obvious ″tendency anomaly′ and ′short-term anomaly″ were observed, and some of them could be likely considered as the ″impending earthquake ″anomaly precursor of apparent resistivity. The changes and distribution features of apparent resistivity show that they are intrinsically related to the dilatancy phenomenon of the loaded rock sample. Finally, this paper discusses the mechanism of resistivity change of loaded rock sample theoretically.

Analysis of Antibiotic Resistance of Escherichia coli Isolated from Pets

[ Objective] This paper aimed to understand drug resistance of Escherichia coli isolated from pets in Guangzhou. I Method ] Broth microdilution method was used to determine the minimal inhibitory concentration （MIC） of ceftiofur, enrofloxacin and other 11 kinds of antibiotics for antimicrobial agent susceptibility testing of 120 strains of clinical E. coli and the experimental data were processed by WHONET 5.4 software. Based on the results of drug resistance pattern analysis, it helped to analyze and study the resistance mechanism. EResultl Clinical E. coli isolated from pets showed a different drug resistance to the 13 kinds of veterinary clinical antibiotics, and the different sources of E. coli also showed a different drug resistance pattern.[Cenclmion] The study provided a theoretical basis for the clinical use of drugs and druq resistance surveillance.

Multidrug resistant Escherichia coli strains isolated from urine sample,University of Gondar Hospital,Northwest Ethiopia

Objective:To assess multidrug resistant(MDR)Escherichia coli(E.coli)isolates from patients with urinary tract infection.Methods:From February to June 2014,a cross sectional study was conducted among urinary tract infection patients at the University of Gondar Hospital.Culture and disk diffusion method were used for E.coli isolation and to determine the antibiotic susceptibility patterns.Data were entered and analyzed using SPSS version 20.P<0.05 was considered as statistically significant.Results:A total of 112 E.coli isolates were identified and the rate of isolation was higher among female participants(28.7%;P=0.03).Of the isolates,104(92.9%)were MDR E.coli;and the isolates showed high resistance rates towards ampicillin(99%),cotrimoxazole(69%),chloramphenicol(58.7%),gentamycin(56.7%)and ceftazidime(55.8%).However,comparative isolates showed low resistance rates to ciprofloxacin(1%),cefepime(8.7%),and ceftriaxone(11.5%).Moreover,resistance rates of MDR E.coli isolates were significantly higher than non-MDR strains for ceftazidime(55.8%versus 12.5%;P=0.015),and ampicillin(99%versus 87.5%;P=0.018).Conclusions:High prevalence of MDR E.coli isolates was observed in this study.Regular monitoring of antibiotic resistance rates is necessarily required to improve and revise empirical antibiotic therapy protocols.