The artifacts in magnetic resonance imagines(MRI) seriously degrade the imagine quality and affect the exact diagnosis. The reasons that may cause artifacts in magnetic resonance imaging and the suppressing methods are presented in this paper. One of the intractability appeared in researches is how to restrain all kinds of artifacts quickly and efficiently. It is important to search for new methods to solve this problem. It may provide reliable basis for medical observation and clinical diagnosis.

Objective To explore the clinical significance of coagulation factor and fibrinolytic indexes in viral hepatitis and pregnant hepatitis. Methods 142 inpatients with viral hepatitis classified into five subgroups (acute hepatitis; mild chronic hepatitis; chronic moderate/severe hepatitis; cirrhosis and severe hepatitis),and 35 cases of pregnant hepatitis were measured eight indexes of FV:C、FVⅡ:C、FX:C、PL:A、t-PA:A、PAI:A、D-D和FDP respectively and the results were compared with that of 90 cases from normal control group and 32 cases of normal pregnant women. Results Compared with control, plasma FV: C increased evidently in acute hepatitis (P

Objective To explore the effect of the standardized swallowing assessment (SSA) on extubation time for patients with nasal feeding. Methods One hundred patients with nasal feeding in our department from January 2013 to December 2014 were divided into the observation group and control group randomly with 50 in each group. The control group was treated with education on aspiratioin prevention and the right time for extubation was decided following doctor′s order. SSA was used in the observation group with weekly SSA and swallowing function, then the patients took pertinent functional exercises till a right time for extubation was decided. The two groups were compared in terms of incidences of re-intubation and aspiration pneumonia. Result The observation group had significantly lower incidences of re-intubation and aspiration pneumonia than the control one (P<0.01). Conclusions SSA is used to assess the swallowing function as well as the aspiration risks , which helps patients to take functional exercise and helps nurses to decide the right time for extubation. It can effectively lower the incidences of re-intubation and aspiration pneumonia and improve patients′prognosis.

Drug addiction is a chronic relapsing brain disease that is characterized by compulsive drug use and persistence of drug craving. Drug abuse can lead to changes in the neuron structure and function of plasticity,alterations in molecules and cells,and ultimately to individual abnormal behavior. Current studies have found that epigenetic changes leading to the sustainability of gene expression is an important mechanism of drug addiction. In this review,we will systematically summarize the latest advances in epigenetic mechanisms of drug addiction. This review is expected to provide robust evidence that repeated exposure to drugs of abuse induces changes within the brain′s reward regions in three major modes of epigenetic regulation-histone modifications such as acetylation and methylation , DNA methylation,and non-coding RNAs. It promises a new perspective from which to gain insights into the genetic and epigenetic mechanisms of drug addiction and a new area for epigenetic research on clinical drug addiction treatment.

Objective To study the antimicrobial resistance changes of common pathogenic bacterial isolates in Guangzhou. Methods Disc diffusion test was used to measure the antibiotic susceptibility of 5063 strains collected from 13 hospitals in Guangzhou from 1998 to 2000 (Fastidious bacteria were detected by E test). Results From 1998 to 2000, the percentage of methicillin resistant Staphylococcus aureus was 45.3%,53.0%, and 50.8%, respectively, and that of methicillin resistant coagulase negative Staphylococcus was 64.1%, 86.0%, and 79.0% accordingly. There was no resistance to vancomycin in the strains of Staphyloccocas and there were 40.7%, 31.8% and 36.4% in E.coli and 43.1%, 42.7%, and 31.5% in Klebsiella found to be extended spectrum lactamases producing in the 3 years. Resistant rates of Enterobacter spp against the third generation cephalosporins increased. Resistant rates of P.aeruginosa against cefoperazone/sulbactam, ceftazidime,amikacin were changed unmarkedly in recent years. Conclusions The antimicrobial resistance of common pathogenic bacteria is serious in Guangzhou area. The surveillance of antimicrobial susceptibility is of great significance.

Object To determine the contents of diosgenin in Rhizoma Paridis by HPLC and TLC. Methods ODS column was used in HPLC with mobile phase: acetonitrile water(90∶10), detection wavelength: 203 nm, column temperature: 35 ℃; silica gel plate was used in TLC with developer: cyclohexane ethyl acetate (4∶1), scan wavelength: 610 nm, reference wavelength: 420 nm. Results The linear ranges of HPLC and TLC were 1 2 - 7 2 ?g (r=0 999 8), 0 2 - 1 0 ?g (r=0 995 7). The average recovery and RSD were 102 2%, 3 39% (n=6) and 100 9%, 2 68% (n=6) respectively. Conclusion Both of two methods can be used for the quality control of diosgenin in Rhizoma Paridis.

Objective The aim of this study was to investigate the expression of IL-6 induced by LPS in ovarian cancer and the effect of IL-6 on the expression of EZH2 mRNA and protein in ovarian cancer cell lines.MethodsCulture ovarian cancer cell lines, according to the different medium composition, establish the experimental group and the control group, detect the concentration of IL-6 in the supernatant of ovarian cancer cells by ELISA and the OD values of each group by MTT assay.Western blotting was used to detect the expression of EZH2 protein in ovarian cancer cells.The mRNA expression of EZH2 was detected by RT-PCR.ResultsThe expression of IL-6 in the supernatant of ovarian cancer cells was significantly higher than that in the control group (P<0.05).The proliferation of ovarian cancer cells was inhibited and the difference was statistically significant (P<0.05).The expression of EZH2 protein in ovarian cancer cells was significantly decreased, and there was statistical difference (P<0.05).The mRNA expression of EZH2 was significantly decreased, and there was statistical difference (P<0.05).ConclusionLPS could induce the expression of IL-6 and inhibit cell proliferation in ovarian cancer cells.IL-6 could inhibit the expression of EZH2.

OBJECTIVE To analyze the sequence of IMP-4 metallo-?-lactamases(MBLs) encoding gene from clinical isolates of multiple-drug-resistant Klebsiella oxytoca strains and attempt to know the integrons composing the drug resistance gene box.METHODS The antibiotic sensitivity test of multi-resistant K.oxytoca strains was done according to Kirby-Bauer method of CLSI 2005,and the double disk synergy test and Etest were for detecting their MBLs.The Class 1 integrons were detected by PCR.The purified amplicons of Class l integrons were sequenced.The type and order of gene cassettes in integrons were analyzed by searching GenBank.RESULTS The K.oxytoca was resistant to carbapenems,the third-generation cephalosporins,cefoxitin,quinolones,cefoperazone/sulbactam,sulfamethoxazole/trimethoprim,amoxicillin/clavulanate,ticacillin/clavulanate,piperacillin,cefepime,rifampicin and piperacillin/tazobatam,only susceptible to amikacin and polymyxin B.The IMP-4 metallo-?-lactamases,aadA1,AmpC,CTX-M-14,qacE△1-sull and intI1 were positive.CONCLUSIONS Integrons are important molecular mechanism in the development of multidrug resistance.There are resistance gene boxes in them.

OBJECTIVE To investigate the genotypes of aminoglycoside-modifying enzymes(AMEs)genes of Acinetobacter baumannii.METHODS Clinical isolates of A.baumannii were collected from 2003 to 2006,and their resistance to gentamicin,amikacin and tobramycin were tested by K-B method.Twenty-three isolates were chosen because of their resistance to aminoglycoside antibiotics(at least resistant to one kind of the drugs).Nine types of the AMEs were detected by PCR.RESULTS Drug resistant rates of 23 isolates of A.baumannii to gentamicin,amikacin and tobramycin,were 86.96%,56.5% and 69.56%,respectively.The detection rates of the 9 AMEs,including ant(3')-Ⅰ,aac(3)-Ⅰ、aac(6')-Ⅰ,aph(3')-Ⅵ,aac(3)-Ⅱ,aac(6')-Ⅱ and ant(2″)-Ⅰ were 69.56%,60.87%,56.52%,47.82%,30.4%,26.09% and 21.73%,respectively.CONCLUSIONS The resistance to aminoglycoside antibiotics of A.baumannii is mainly caused by AMEs.