Objective To analyze the mechanism of imipenem resistance in Pseudomonas aeruginosa clinical isolates. Methods? Antibiotic?resistance?was?analyzed?using?VITEK32?system.?Metallo?β-lactamase?activity?was?determined?by?double-disc?synergy?test.?Amp?C?β-lactamase?activity?was?determined?by?Kirby-Bauer?disc?method.?OprD?protein?was?analyzed?by?sodium?dodecyl sulphate-polyacrylamide gel electrophoresis. PCR was performed to amplify gene oprD. The amplified products were subject?to?sequencing?analysis.?The?phylogenetic?relationship?was?determined?using?random?amplified?polymorphic?DNA?(RAPD)?method. Results Membrane protein OprD was analyzed in 7 clinical isolates of imipenem-intermediate P. aeruginosa. Two strains were devoid of OprD proteins and the corresponding oprD genes were found disrupted by the insertion element ISRP10 in the coding regions. Five strains had OprD proteins with different sizes. Sequence analysis showed that the peptides ranged from 427 to 443 amino acids. Multiple amino acid substitutions and / or deletions were found within the Loop 1 through Loop 8 of the OprD secondary structures. Conclusions ISRP10 inactivation and amino acid substitutions in oprD gene confer imipenem resistance in the clinical isolates of P. aeruginosa.

Objective To analyse the preoperative diagnose and treatment experience of applying endovascular graft exclusion (EVGE)curing thoracic aortic dissection(AD) ,thus provide experience of diagnose and treatment for cure AD in clinical .Methods Review the clinical data ,therapeutic measures and follow‐up results of 226 AD patients .All patients were treated by EVGE ,coun‐terchecked by DSA post‐operation and reviewed .Results CTA and MRA in the diagnosis of crevasse position coincidence rate was 96 .8% and 95 .2% respectively .One case failed ,the remaining 225 cases were successfully placed graft ,success rate was 99 .6% .It showed that 93 .8% (211/225) complete disappearance of the false lumen or remarkable decrease of the endoleak was noted on the angiograms after stent implantation .No severe procedure‐related complications and death was observed .Conclusion CTA and MRA are important for us to choose appropriate routes ,can be the first choice of pre‐operation examination .EVGE is small trauma , short recovery time and effective in curing AD .

Objective To investigate the value of high-resolution magnetic resonance imaging (HRMRI)in diagnosis of extramural vascular invasion (EMVI)of rectal cancer.Methods 33 patients with rectal cancer were reviewed preoperatively.The MRI findings of EMVI of all cases were scored and compared with the postoperative pathological results.Results The MRI EMVI scores were consistent with histopathology findings (k=0.324,P=0.039).The accuracy rate of MRI in diagnosis of EMVI was 66.7% (22/33).The MRI EMVI scores rose up with increased pT stage,meanwhile there was a high correlation between both (r=0.546).The percentage of MRI EMVI positive number was increased with elevated pT stage,and there was also a high correlation between both (r=0.469). ROC curve showed that MRI EMVI scoring was an effective method in diagnosis of rectal cancer EMVI (AUC=0.757).Conclusion HRMRI is a valuable method in diagnosis of EMVI of rectal cancer.

Carbonyl reductases catalyze carbonyl compounds to chiral alcohols that are important building blocks in fine chemical industry. To study carbonyl reductase from Pichia pastoris GS115 (ppcr), we discovered a new gene (ppcr) encoding an NADPH-dependent carbonyl reductase by genomic data mining. It was amplified by PCR from the genomic DNA, and expressed in Escherichia coli BL21 (DE3). The recombinant protein was purified to homogeneity. The optimum temperature was 37 degrees C and the optimum pH of PPCR was 6.0. PPCR was stable below 45 degrees C. The Km and k(cat) value of the enzyme for ethyl 3-methyl-2-oxobutanoate were 9.48 mmol/L and 0.12 s, respectively. The enzyme had broad substrate specificity and high enantioselectivity. It catalyzed the reduction of aldehydes, a-ketoesters, beta-ketoesters and aryl ketones to give the corresponding alcohols with >97% ee with only a few exceptions, showing its application potential in the synthesis of chiral alcohols.
Alcohol Oxidoreductases ; biosynthesis ; chemistry ; genetics ; Amino Acid Sequence ; Biotechnology ; methods ; Cloning, Molecular ; Escherichia coli ; genetics ; metabolism ; Molecular Sequence Data ; Pichia ; enzymology ; Recombinant Proteins ; biosynthesis ; chemistry ; genetics ; Stereoisomerism ; Substrate Specificity ; Temperature

Objective To investigate the MRI features of serous borderline ovarian tumor(SBOT).Methods The clinical and MRI features of 1 1 patients with SBOT were retrospectively reviewed and compared with surgical and pathologic findings.Results There were 5 bilateral and 6 unilateral cases,and the maximum diameter was 4.4-20.7 cm.According to the MRI appearances,it was divided into surface papillary and cystic papillary subtypes by morphological features and exophytic and endophytic proj ections by growth of papillary architecture.The papillary architecture with internal branching was the characteristic MRI appearance,the papillary architecture showed hypo-intensity on T1WI and hyper-intensity on T2WI with a lobulated contour,the internal branching showed hypo-intensity on T1WI and T2WI.The papillary architecture was obviously enhanced,while the internal branching was slightly enhanced after inj ection of contrast agent.Conclusion The papillary architecture with internal branching is a characteristic MRI appearance of SBOT which provides information for the diagnosis and differential diagnosis;and the types according to the MRI appearances and growth pattern of papillary architecture provides reference for the treatment and prognosis.

Objective To evaluate the surgical strategy for pulmonary valve preservation in repair of tetralogy of Fallot (TOF) and analyze the outcomes in young children patients.Methods A total of 211 TOF younger children less than threeyear-old between January 2009 and December 2015 had received pulmonary valve-sparing(PVS) surgical repair.At the end of the procedure,the peak RV/LV pressure ratio(PRV/PLV) and transannular pressure gradient were performed in all patients.114 patients had higher PRV/PLV rati ≥ 0.8.The former 54 patients,right ventricle infundubulum sparing (RVIS) stragery were made to relieve the RVOTO.However,only 8 patinets of the later 60 cases had received RVIS in TOF repair,whose systemic blood pressure was instable with the large dose of dopamine≥10 μg · kg-1 · min-1 and epinephrine≥0.05 μg · kg-1 · min-1 or the transannular pressure gradient≥30 mmHg (1 mmHg =0.133 kPa).114 patients were divided by two group(52 cases in PVS group and 62 cases in RVIS group) and compared by the early outcomes.Results The median cardiopulmonary bypass time of RVIS group was significantly more than that of PVS group[(110.3 ± 12.0)min vs(77.7 ± 10.0)min].The postoperative index of the patients in PVS group,including transannular pressure gradient [(21.0 ± 5.4) mmHg vs (16.0 ± 3.6) mmHg,P ＜ 0.05],PRV/PLV ratio(0.82 ± 0.03 vs.0.67 ± 0.12,P ＜ 0.01),median using time of dopamine and epinephrine[(6.03 ±9.60)days vs.(4.20 ±1.90)days,P＜0.01],median extubation time[(81.2 ±27.6)h vs.(38.5 ±33.0) h,P ＜ 0.01],ICU stay time [(6.3 ± 1.7) days vs.(4.3 ± 1.9) days,P ＜ 0.01],using of peritoneal dialysis (8/52 vs 4/62,P ＜ 0.01)were more than those in RVIS group.There was no difference of mortality between two groups.Fellow up 12-50 months,there was no difference of LVEF,MPI and TAPSE between two groups.However,the severity of pulmonary regurgitation in patients of PVS group was significant less than those of RVIS group.Conclusion PVS and RVIS in TOF repair could decrease the severity of pulmonary regurgitation after operation.

Objective To explore the feasibility of differential diagnosis of Gleason score (GS)(3+4)and (4+3)in prostate cancer (PCa) based on texture parameters of T2 WI and ADC maps.Methods A total of 77 patients with GS 7 points in PCa confirmed by pathology were enrolled in this retrospective study,including 45 GS(3+4)cases and 32 GS(4+3)cases.ROI was manually drew on the largest section of tumor on the axial T2 WI and ADC maps,and five texture parameters were extracted,namely,angular second moment (ASM),contrast, correlation,inverse difference moment and entropy,and the texture parameters between groups were analyzed statistically,then ROC curve was used to evaluate the diagnostic efficiency of texture parameters with statistical differences.Results There was no significant difference in age and prostate specific antigen (PSA)between GS (3 + 4)and GS (4 + 3)groups (P＞0.05).There were significant differences in ASM and entropy between T2 WI and ADC (P＜0.05),but there was no statistical difference in contrast,correlation and inverse difference moment (P＞0.05).Except for the AUC of T2 WIASM,there were statistical differences among T2 WIentropy ,ADCASM and ADCentropy.The AUC of ADCASM and ADCentropy were larger than that of T2 WIASM and T2 WIentropy.The AUC of ADCentropy had the largest AUC (0.732),the cut off value was 5.71 ,with the sensitivity was 97.6% and specificity was 5 9.5%.Conclusion MRI texture analysis can be used to differentiate GS (3 + 4)from GS (4 + 3)in PCa,and the ADCentropy have the best diagnostic efficacy.

Objective To investigate the MR imaging findings of Li-pilocarpine-induced acute epilepsy rats and explore the pathophysiological changes of acute epilepsy rats.Methods Twenty-two SD rats were randomly divided into control group (n=9) and model group (n=13). Rats in the model group were intraperitoneally injected with lithium chloride and pilocarpine, while rats in the control group were given equal volume normal saline. All rats were given MR imaging plain scan and diffusion weighted imaging (DWI). The images of rats of the two groups were compared, and the differences of apparent diffusion coefficient (ADC) of the hippocampus, piriform cortex, entorhinal cortex and sensory cortex were compared.Results Four rats in the model group show hyperintensity in T2 weighted imaging and 6 rats in the model group showed hyperintensity in DWI; as compared with T2 weighted imaging, DWI has wider display ranges, mainly distributed in the sensory cortex, and piriform cortex+entorhinal cortex. As compared with those in the control group, the ADC values in sensory cortex and piriform cortex+entorhinal cortex of model group significantly decreased (P<0.05). There were no statistical differences of ADC values in the hippocampus between two groups (P>0.05).Conclusion Multiple regions are involved in acute epilepsy rats, which maybe shown by MR imaging; changes in the somatosensory cortex and piriform cortex+entorhinal cortex may occur before those in the hippocampus.

OBJECTIVE: To carry out genetic and metabolite analysis for an infant with cerebral creatine deficiency syndrome type 2 (CCDS2). METHODS: Clinical data of the child was collected. Whole-exome sequencing was carried out to identify potential variants by next generation sequencing. Candidate variants were confirmed by Sanger sequencing. Metabolites were determined by tandem mass spectrometry and magnetic resonance spectroscopy. Treatment was carried out following the diagnosis and genetic counseling for the affected family. RESULTS: Two novel heterozygous variants (c.289delC and c.392-1G>C) of the GAMT gene were identified in the proband, which were respectively inherited from her father and mother. In silico analysis suggested both variants to be pathogenic. Creatine (Cr) level of the child was very low, and cerebral guanidinoacetate (GAA) level was slightly increased. But both had recovered to normal in two weeks, and cerebral Cr level was significantly improved after two months. Intellectual and motor development of the child were significantly improved. CONCLUSION The child was diagnosed with CCDS type 2, for which pathogenic variants of the GAMT gene may be accountable. Treatment has attained a satisfactory effect for the patient.

BACKGROUNDHepatic alveolar echinococcosis (AE) is a parasitic disease in humans and caused by the Echinococcus multilocularis (Em). Orthotopic liver transplantation (OLT) may be the only effective treatment for end-stage hepatic AE. However, in some AE patients, extrahepatic Em can not be completely eliminated after OLT. We aimed to study whether the immunological changes caused by Em evasion may influence the rejective response.

METHODSRat modles of AE were established by injecting the Em suspension into abdomen of Brown Norway (BN) rats. Three months later, in the experimental group, the liver was transplanted from Lewis (LEW) rats to Em-infected BN rats. In the control group, transplantation was from LEW rats to healthy BN rats. Liver tissue and peripheral blood (PB) samples were collected on days 1, 3, 5, and 7 after OLT. Liver tissue was analyzed after hematoxylin and eosin (H&E) staining; numbers of CD4, CD8, and CD28 on peripheral blood cells were detected by flow cytometry; and expression of the chemokine fractalkine (Fkn) was detected by reverse transcription PCR (RT-PCR). Interleukin-10 (IL-10) was measured in the serum by enzyme-linked immunosorbent assay (ELISA). In every group, eight BN rats were retained for observing survival time.

RESULTSThe survival times of recipients in the experimental group were prolonged compared with those in the control group. The rejective response occurred later and was milder in the experimental group. percentage of CD4, CD8, CD28 T-cells and Fkn mRNA expression were lower in the experimental group. While the serum IL-10 levels were higher in the experimental group than those in the control group.

CONCLUSIONSAcute rejective response after OLT was attenuated in the rats with Em infection, and the recipients` survival time was prolonged. Em may play a role in this process by elevating IL-10 secretion, decreasing the effector T cells, inhibiting the expression of Fkn, which lead to reduce the inflammatory cells infiltration into the liver.

Animals ; CD28 Antigens ; metabolism ; CD4-Positive T-Lymphocytes ; metabolism ; CD8-Positive T-Lymphocytes ; metabolism ; Echinococcosis, Hepatic ; mortality ; surgery ; therapy ; Echinococcus multilocularis ; pathogenicity ; Enzyme-Linked Immunosorbent Assay ; Flow Cytometry ; Graft Rejection ; immunology ; Interleukin-10 ; blood ; Liver Transplantation ; adverse effects ; Rats ; Reverse Transcriptase Polymerase Chain Reaction