Objective To analyze the advantages and disadvantages of various harmonic magnetic resonance elasticity reconstruction algorithms.Methods Different reconstruction algorithms were categorized according to their mathematical hypotheses.The influence of different assumptions on elasticity reconstruction was investigated with experiments and from mathematical fundamentals.Results The finite element full inversion method had higher precision while more computational time.The algorithms with local homogeneity and incompressibility assumptions were faster while less accurate.The algorithms considering the local change of elastic moduli could effectively reduce boundary artifacts.Conclnsion Different assumptions of algorithms may cause levels of errors between the estimated and real elastic moduli.The selection of elasticity reconstruction algorithms in practical experiment requires a comprehensive tradeoff.

BACKGROUND:Zinc oxide has shown extraordinary antibacterial effect. But the antibacterial mechanisms of zinc oxide have not been wel developed, and the safety of zinc oxide has not yet been confirmed.
OBJECTIVE:To summarize the antibacterial mechanism and safety of zinc oxide based on the current research situation of zinc oxide.
METHODS:The CNKI database and PubMed database (2005-01/2013-08) were used to search the related articles about zinc oxide antibacterial mechanism and safety. The retrieval keywords were“zinc oxide or ZnO, antibacterial”,“zinc oxide or ZnO, safety”both in English and Chinese.
RESULTS AND CONCLUSTION:The antibacterial mechanism of zinc oxide is complex. Zinc oxide reveals its antibacterial power by photo catalysis, zinc ion dissolve out, and active oxygen. But the relationship between photo catalysis and active oxygen is different based on different studies. The safety of zinc oxide is not confirmed, and different studies have different results. Especial y for the nano-zinc oxide, some studies have showed that the zinc oxide is toxic. Al of these mean much more researches are needed to verify the safety of zinc oxide.

Objective To establish a method for simulataneous determination of 18 free amino acids in snake venom. Methods Preparation of free amino acid samples by membrane. HPLC analysis was performed after derivatization by using phenyl isothiocyanate (PITC) as a derivative reagent, samples were analyzed on Ultimate LP-C18 column with gradient elution column of 0.05 mol/L sodium acetate buffer and methanol-acetonitrile- water (40:40:20), and current speed was1.0 mL/min, and the column temperature was set at 35℃, and detection wavelength was 254nm. Results The 18 kinds of amino acids showed a good linearity with the correlation coefficients ≥0.99. The recovery rate was 74.59%~110.62%. Snake venom contained 17 kinds of amino acids, the total content of amino acids was 0.2%. Conclusion The method was accurate, reproducible and reliable, and can be used for the determination of amino acids in snake venom and related products.

Objective To evaluate the diagnosis and therapy of solid pseudopapillary tumor of the pancreas (SPTP).Methods From January 2006 to October 2011,the clinicopathological data of 24 SPTP patients diagnosed and surgically treated at Tianjin Medical University Cancer Hospital were analyzed retrospectively.Results There were 22 women and 2 men,the median age was 27.5 years old,with a range from 12 to 51 years.The most common tumor localization were at the head of the pancreas ( 11 patients,45.7％ ),followed by the body (5 patients,20.8％ ),the tail (4 patients,16.7％ ),the body and the tail (3 patients,12.5％ ) and the neck (one patient,4.2％ ).Clinical symptoms were nonspecific and the preoperative diagnosis of SPTP depended on imaging study such as ultrasonography,CT and MR.All patients were treated surgically and the correct diagnosis was made according to pathology after surgery.In a follow-up ranging from 2 to 55 months( median 27.2 months),23 cases were alive with no evidence of disease recurrence,one patient was alive with tumor recurrence.Conclusions SPTP was a less common neoplasm with low-grade malignancy,occurring mainly in young women.Complete tumor resection results in satisfactory prognosis.

Objective To investigate the expression of interleukin-18 in tuberculous pleurisy and its clinical significance by measuring the tuberculous pleurisy pleural effusion in patients with interleukin-18 levels.Methods The clinical data of 20 patients with primary diagnosis of tuberculous pleurisy and 20 patients with non-tuberculous pleurisy (including pneumonia,purulence,etc.) from December 2016 to June 2017 were retrospectively analyzed in the Department of Thoracic Surgery,Dongfang Hospital of Lianyungang City.Immunoassay was used to determine the level of interleukin-18 in pleural effusion of patients with tuberculous pleurisy and non-tuberculous pleurisy and adenosine deaminase by enzymatic method.Interleukin-18 levels and adenosine deaminase levels were compared between the two groups.Measurement data were expressed as ((x) ± s).The difference between the two groups using t test.Results The level of pleural effusion interleukin-18 in patients at admission was (520.5 ± 42.6) pg/ml and that in non-tuberculous pleurisy patients was (174.5 ± 12.7) pg/ml (P ＜ 0.05).Tuberculous pleurisy decreased pleural effusion interleukin-18 levels to (425.5 ± 27.5) pg/ml,(368.4 ± 21.7) pg/ml,(208.9 ± 15.9) pg/ml.Interleukin-18 in pleural effusion was significantly lower than that at admission (P ＜ 0.05) after 7 days of treatment.Conclusion Interleukin-18 production may be the cause of tuberculous pleurisy,may be used as an early diagnosis of inflammatory pleural effusion and observe the therapeutic effect of the immune indicators.

Objective To discuss whether it is necessary to integrate metabolic indices into diagnosis of polycystic ovary syndrome (PCOS).Methods Taking ESHRE/ASRM diagnosis as the gold standard,51 women with PCOS and 47 women without PCOS were selected and divided into the intervention group and control group respectively from the Department of Gynecology in the Second Affiliated Hospital of Kunming Medical University between January 2013 and July 2014.Logistic regression based on principal component analysis and significant variables chosen through single factor analysis were used to establish the new diagnostic model which combined reproductive indices and metabolic indices.We evaluated the validity and reliability of the new diagnostic model by using ROC curve analysis.Finally,we analyzed the consistence and difference between the new diagnostic model and the gold standard.Results Thirteen significant variables were chosen using single factor analysis.ROC analysis showed that an area under the curve was 0.976 (P＜0.001) and the optimal cut-off point was 0.526 with a sensitivity of 96.08％,a specificity of 93.62％ and a consistency of93.88％.The new diagnostic model had superior validity and reliability.The two diagnostic methods had strong consistence (Kappa=0.877,P＜0.001) and no difference (x2=0.167,P=0.688).Conclusion Considering that the integration of metabolic indices does not change the diagnosis result,we come to a conclusion that it is unnecessary to integrate metabolic indices into diagnosis of PCOS.

A simple and green method for the determination of trace bisphenol A( BPA) was established by coupling supported ionic liquid solid phase extraction to β-cyclodextrin modified ionic liquid carbon paste electrode-based electrochemical detection ( SILs-SPE-ED) . The synthesized imidazolium ionic liquid modified styrene type macroporous resin was used as adsorbent for SPE of BPA. The critical parameters that affect the extraction efficiency were optimized, including 0. 4 g of packing material quantity, 200 mL of sample solution at pH 7. 0, 5 mL of methanol as an eluent solvent, and 4. 5 mL/min of the SPE flow rate. Dynamic adsorption test showed that the maximum adsorption capacity of BPA on the SILs-SPE cartridge was 10. 1 mg/g, and the enrichment factor was 40 . The calibration curve showed a good linearity between the anodic current and the BPA concentration in the range of 1. 0×10-8-1. 0×10-6 mol/L (i. e. 2. 3-228μg/L). The detection limit was 4. 16×10-9 mol/L (equal to 0. 95 μg/L). The SILs-SPE-ED method was applied to the analysis of water and plastic samples and the results agreed well with HPLC method.

Objective To observe the application of mtDNA COI genes in common sarcosaphagous flies species identification. Methods 30 sarcosaphagous fly samples were indentified by morphological method which collected in different regions belonging to 2 families, 4 genera and 6 species. MtDNA was extracted for the PCR amplification reaction in COI gene. The PCR products were purified through agar gel electrophoresis and sequenced. Sequences of 498 bp in COI gene were disposed by multiple-alignment software of DNAMAN. Sequences divergence of 498 bp between and within species of COI gene were processed by software of MEGA. Results It was showed that there is a certain sequence differences between the 30 samples from 6 species. The intraspecific and interspecific divergence of sequence variation ranged from 0.1% to 1.6% and 2.2% to 11.2% respectively. All the species can be identified successfully by this method. Conclusion Species identification of sarcosaphagous flies can be conducted by sequence analysis and phylogenetic tree of COI gene. This method can be effectively used in fast and accurate identification in forensic entomology.

ObjectiveTo observe the clinical effect of Kangxiuke apozem in the treatment of severe bum shock.Methods40 patients of severe burn shock were randomly divided into a treatment group and a control group,with 20 patients in each group.All the patients were treated by the same route of counter-shock therapy,and the treatment group was additionally given Kangxiuke apozem (nasal feeding,qd,150 ml/d).Level of blood lactic acid,heart rate and urinary volume were evaluated by time.Main shock symptoms,including restlessness,hydrodipsia,perspiration and coldness,were observed.ResultsThe treatment group was significantly superior to the control group in the amelioration of blood lactic acid,heart rate and urinary volume ( t =10.485、3.219、7.429,P＜ 0.01 ).The symptomatic extinction of restlessness,hydrodipsia,perspiration and coldness in the extremities in the treatment group were significantly superior to those in the control group (x2=10.16、7.37、5.63、4.29,P＜0.05).ConclusionAt the same time of routine counter-shock therapy,thereby prompt burn patients to smoothly go through shock period and decreas late complications.

Adult ; Air Pollutants, Occupational ; analysis ; Dust ; analysis ; Female ; Humans ; Male ; Middle Aged ; Occupational Exposure ; adverse effects ; Occupational Health ; Welding ; Young Adult