Study on expression and activity of combinant antimicrobial peptide in Pichia pastoris / 国际检验医学杂志

Objective To construct cecropin A-thanatin combinant gene engineering antimicrobial peptide gene CA(1-7)-T(4-19) for expression in Pichia pastoris.Methods The combinant antimicrobial peptide gene was artificially synthesized via gene splicing by overlap extension (SOE).The gene was cloned into the pPICZαA vector and transformed into Pichia pastoris X-33 by electroporation.The positive clones obtained by the screening of bleomycin resistance were induced by methanol ,and the antibacterial activity of the products was detected and the antimicrobial spectrum was established.Results The combinant peptide gene CA (1-7)-T (4-19) was successfully cloned on the carrier pPICZαA.The identification results were consistent with the pre-designed gene sequence.The combinant peptide gene was expressed under the induction of methanol ,and the minimum inhibitory concentration of 76 strains of Gram-egative and Gram-positive pathogenic bacteria isolated from the clinic was obtained ,and the minimum inhibitory concentration was up to 5 μg/mL.Conclusion A combinant genetic engineering antimicrobial peptide with antibacterial activity was obtained successfully and it had obvious inhibition effect on clinical common multidrug-resistant strains.

Comparison of two methods of lymph node dissection for early influence the prognosis of patients with lung cancer / 中国基层医药

Objective To investigate two kinds of methods of lymph node dissection for early effects on the prognosis of the patients in the treatment of lung cancer by comparative study,and provide guidance for clinical treat-ment.Methods 98 cases of early stage lung cancer patients who were taken using elective surgery were selected in the study.According to the random number table,they were divided into two groups of 49 cases for each other.Sort of an odd number of patients in the observation group,and given systematic lymph node dissection (LND);sort of an even number of patients in the control group,which was systematically sampled lymph node dissection (LNS).After dissection from the relevant data,following -up of 5 -year survival,relapse rate,quality of life and other data for com-parison and statistical analysis were accessed.Results In the observation group,the number of lymphatic vessels in the cleaning,operation time,3 years,the survival rate of 5 years,2 years,3 years and 5 years recurrence rate and survival quality total score comparison is superior to the control group,with significant difference (P 0.05);The nerve injury rate of the observation group was higher than the control group,there was significant difference (P <0.05).Conclusion Systematic lymph node dissection for treatment of early lung cancer has a thorough cleaning,operation time is short,the short -term survival rate is high,low recurrence rate,high quality of life and other advantages,and has the value of popularization.But there was the amount of bleeding,nerve injury and high rate of defects,it needs to be further perfected.

Data analysis of MRI misdiagnosis and missed diagnosis of breast lesions on clinical, radiologic and pathologic features / 肿瘤研究与临床

Objective To analyze the MRI data of misdiagnosed and missed diagnosed of breast lesions and their histopathological features.Methods Data from 241 breast lesions within 121 patients were recruited in this study.The data included MRI images,uhrasounds and X-ray images were retrospectively interpreted by two radiologist and each lesion was assessed according to the BI-RADS classification.The pathologic features of miss or error diagnosed lesions on MRI were analyzed.Results In 241 breast lesions (malignance 120,bcnign 121),4 lcsions were miss diagnosed on MRI.Thcy were 2 intraductal papillomatosis and 2 fibroadenoma.All was benign.Twenty three lesions were misdiagnosed on MRI.Sixteen were overestimation,including 3 chronic inflammations,3 sclerosing adenosis,2 fibroadenoma,4 fibrocystic changes with or without atypical ductal hyperplasia (ADH),2 intraductal papilloma,1 infiltration of pectoralis major muscle and 1 axillary lymphnode metastasis.Meanwhile,there were 7 lesions were underestimation.These lesions included 2 invasive ductal carcinomas,1 mucinous adenocarcinoma,2 DCIS and 1 blunt duct adenosis with ADH and focal cancerous,1 inflammatory breast cancer underwent chemotherapy.The sensitivity and specificity and accuracy of breast MRI were 95.83 ％ (115/120),72.73 ％ (88/121),84.23 ％ (203/241),respectively.MRI findings had no difference with respect to mammogram or ultrasound was 75.10 ％ (181/241).Conclusion MRI misdiagnosis and missed often occurs in smaller breast lesions,morphologic and hemodynamic malignant manifestation atypical,especially intraductal lesions.MRI diagnosis should be combined with physical examination,X-ray mammogram and ultrasound to improve diagnostic accuracy and reduce missed diagnosis.

Assessment of pulmonary function using pixel indexes of multiple-slice spiral CT low-dose two-phase scanning in chronic obstructive pulmonary disease / 中华放射学杂志

Objective To explore the values of pixel indexes (PI) with multiple-slice spiral CT low-dose two-phase scanning for assessing the pulmonary function in chronic obstructive pulmonary disease (COPD).Methods Thirty-six patients with COPD (COPD group)and 30 healthy people (control group)underwent pulmonary function test (PFT).Chest 64-MSCT low-dose (50 mAs) scanning at full inspiration and expiration,routine scanning (100 mAs) at inspiration were performed.The effective dose (ED) was calculated.The lung was divided into three regions ( upper,middle,lower).PI of lung were divided into five groups:-960--1024, -910--960, -800--910, -700--800,-400--700.ThePI-910 (sum of the PI under -910 HU) of low-dose scanning at each region were measured and calculated using pulmo software. All PI included PIin-910,PIex-910,PIin-910-PIex-910, PIex-910/PIin-910 and (PIin-910-PIex-910)/PIin-910.All patients underwent PFT within 3 days after 64-MSCT canning,FEV1％ and FEV1/FVC were selected for comparison. Results The PIin in three regions ( - 960 - - 1024,-910 - -960,-800 - -910) were statistically significant between normal and COPD groups( U =0.00,57.00,20.50,P ＜ 0.01 ). The PIex in all regions were statistically significant ( U =0.00,0.00,71.52,191.00,6.00,P ＜ 0.01 ). PI-910--1024 at expiration and inspiration were correlated with FEV1％ and FEV1/FVC( r =- 0.548,- 0.664,- 0.752,- 0.781,P ＜ 0.01 ).PIin -910,PIex -910,PIex-910/PIin -910,( PIin -910-PIex -910 )/PIin -910 had a good correlation with FEV1％ and FEV1/FVC ( r =- 0.548,- 0.664,- 0.752,- 0.781,- 0.674,- 0.642,0.674,0.642,P ＜ 0.01 ).Conclusion Pixel indexes of 64-MSCT low-dose two-phase scanning can be used to evaluate pulmonary function in COPD patients.

Clinical manifestation and MRI feature on three patients of toxic encephalopathy after inhaling caffeine and sodium benzoate / 中华神经科杂志

Objective To study the clinical manifestation and MRI feature of toxic encephalopathy after inhaling caffeine and sodium benzoate. Methods Three patients with toxic encephalopathy induced by inhaling caffeine and sodium benzoate were observed clinically and with MRI. Results The 3 patients were male. They all had definite addiction histories (the time of addiction for 3 years to 7 years ). There were special language and retropulsive dystonia besides the common characteristics of toxic encephalopathy:reaction retardation and disturbance of intelligence. MRI showed the change of generalized demyelination in bilateral symmetrical cerebral hemisphere, posterior limbs of internal capsule, corpus callosum, medial lemniscus, and cerebellum hemisphere dentate nucleus. The clinical symptoms of 3 patients were significantly improved 40 days after the adrenocortical steroid and neurotrophic treatment. The mild mood disorder remained in case 1. Conclusion Clinical manifestation and MRI of toxic encephalopathy after inhaling caffeine and sodium benzoate are known, so we could diagnose the patients of the disease in time.