Based on M9 culture medium,the concentration of ingredients of culture medium was optimized for the fermentation of pNSR32/BL21(DE3),the engineering bacterial with spider silk protein,and lactose as an inducer.The condition of optimum culture medium was obtained for the expression of the high molecular weight recombinant spider silk protein by using orthogonal and individual factor experimental design.The result was showed that the optimum culture medium was consisted of 0.3% glycerol,3% yeast,0.75% tryptone,0.05%(NH_4)_2SO_4 and a little inorganic salt_.It was confirmed that the optimum culture medium will benefit the growth of bacterial and expression of recombinant spider silk protein.The production level of propose protein will attain at 20% of the total proteins in the fermentation.

Objective To explore the effect of recombinant human vascular endostatin(Endostar,YH-16) on MCF-7 human breast cancer cells in nude mice. Methods Forty nude mice were randomized into four groups and received injection with MCF-7 cells. When gross tumor volume reached 1.0 cm3 ,mice were injected subcutaneously once every two days as following for 20 days: (1) O. 9% NS(0. 2 mg/kg) in negative control group;(2) YH-16(20 mg/kg) in YH-16 group; (3) DDP (1 mg/kg) in positive control group; (4) DDP (1 mg/kg) plus YH-16(20 mg/kg) in DDP plus YH-16 group. Mice were killed by cervical spine disloca-tion. And the body weight, tumor volume, rate of tumor inhibited, VEGF, apoptosis rate of tumor cells and pul-monary metastasis rate were detected. Results The means (SD) of tumor volume in DDP plus YH-16 group,positive control group, YH- 16 group and negative control group were 0. 686 (0. 229), 1. 258 (0. 101), 1. 888 (0. 215), 3. 366 (0. 284) cm3, respectively (P <0. 05) ; the rates of tumor inhibited in the four groups were 92. 1% ,57.3 %, 36. 5 % and 0, respectively (P < 0. 05) ; pulmonary metastasis rates were 0, 10%, 20% and 90% ,respectively(P <0. 05) ;the mean (SD) of apoptosis rates of tumor ceils were 31.6% (2. 7%) ,28. 1%(2. 7%), 19. 4% (2. 9%), 15.7% (3.2%), respectively (P < 0. 05). The mean of absorbance of VEGF in the four groups were 0. 530 ± 0. 164,0. 759 ± 0. 210,1. 063 ± 0. 295,1. 268 ±0. 145 (RT-PCR) and O. 260 ±0. 082,0. 348 ±0. 085,0. 461 ±0. 099,0. 556 ± 0. 113(Western blot) ,respectively(P < 0. 05). Conclusion YH-16 can inhibit MCF-7 breast cancer cell growth and distant metastasis in nude mice with little adverse reac-tion. YH-16 has synergistic effect combined with DDP.

Alzheimer's disease (AD) is a neurodegenerative disorder characterized by memory loss and cognitive decline. The pathological eatures of Alzheimer's disease are abnormal deposition of amyloid beta-peptides (Aβ), neurofibrillary tangles, cholinergic deficits, and loss of synaptic processes and dendritic spines. Senescence accelerated mouse prone 8 exhibits age-related deficits of learning and memory from an early age, tau protein phosphorylation, neurotransmitter changes, synaptic structure and function disorders, circadian rhythm disorders,as well as gene expression and many other characteristic changes, which are consistent with Alzheimer's disease pathological changes，and can be used as an ideal animal model for Alzheimer's disease prevention drugs development.

Objective: To discuss the imaging features of esophageal fistula and the value of intervention.Methods: We retrospectively analyzed the complete clinical data of 12 cases of esophageal fistula treated from June 2000 to May 2008,of whom,2 developed esophago-thoracis fistula and esophago-mediastinum fistula respectively after conservative radiotherapy,and 10 developed esophageal fistula after surgery for esophageal cancer.All the patients received iodine-based oral contrast,spiral CT scanning and intraperitoneal stent implantation for fistula closure.Results: Iodine-based oral contrast showed that the contrast agent overflowed into the chest in 8 cases,into the airway in 3 and into the mediastinum in 1.Spiral CT scanning revealed 8 cases of pleural fistula and 2 cases of remnant stomach-airway fistula,but failed to display the other 2 because of the small size.Intraperitoneal stent implantation was successfully accomplished in all the cases,which helped to close the fistula,take in food,stop bucking,control lung,mediastinum and other infections,and improve the patients' quality of life.Conclusion: Esophageal fistula can be effectively diagnosed based on the findings of iodine-based oral contrast and spiral CT scanning.As a novel technique,intraperitoneal stent implantation for fistula closure,simple,safe and with obvious immediate effect,is well worth promoting.

Objective:To study the CT and PET/CT features of pleural mesothelioma and the value of CT and PET/CT imaging in the diagnosis of the disease.Methods:We retrospectively analyzed the spiral CT images of 23 patients and PET/CT images of 7 patients with pleural mesothelioma,all histologically confirmed.Results:Of the 23 cases detected by spiral CT,7 were benign and 16 malignant;local nodular pleural thickening was found in 9 cases,7 benign and 2 malignant;diffuse pleural thickening was observed in 14 cases,all malignant.Of the 7 cases diagnosed by PET/CT,5 were excluded from surgery.Conclusion:CT imaging helps determine the location,shape,extent of the pleural lesion and its relation to the surrounding tissues,while PET/CT is better in the differentiation of pleural mesothelioma and staging of malignancy,and therefore plays an important guiding role in the treatment of the disease.

Objective To evaluate the efficacy and safety of emergency percutaneous coronary intervention(PCI) in patients with non-ST-segment elevation acute coronary syndrome(ACS).Methods A total of 233 patients(emergency group) were treated with emergency PCI within 48 h of heart attack and another 152 patients(delayed group) were treated with PCI after 3-14 days of medical therapy.All culprit lesions were treated.Procedural success rate,the time from admission to angina relief,the length of hospital stay and cardiac events incidence in 30 days were observed.Results The procedural success rates for the emergency group and the delayed group were similar(98.1% vs 95.5%),but cardiac events incidence in 30 days was significantly lower in the emergency group than that of the delayed group(2.9% vs 14.1%,P

Objective To investigate the principle and its clinical initial application of the dual-energy imaging with the dual-source CT and increase the realization of it. Methods According to the research results of the dual-energy imaging with the dual-source CT and the course of development of the dual-energy imaging to analyze and summarize the basis radiological physics, the principles, the correlation parameters and the clinical initial application of the dual -energy imaging with the dual -source CT. Results The dual -energy imaging with the dual -source CT is different from other common dual-energy imaging, it has its own special feature. Conclusion According to the analysis of the dual-energy imaging with the dual-source CT, greatly increase the realization of the dual-energy imaging with the dual-source CT.

Objective:Percutaneous fluoroscopic gastrostomy(PFG) is an alterative method for the patients who were not suitable for percutaneous endoscopic gastrostomy(PEG) and stent.This is a study to report the clinical experience of PFG in 25 patients. Methods:Twenty-five patients could not have oral intake due to obstruction of the oesophagus and depended on long-term parenteral nutrition.They contraindicated for percutaneous endoscopic gastrostomy.Results:The procedures all were successful completed without complication.The patients could use home enteral nutrition and get rid of parenteral nutrition.The patients' quality of life was improved significantly.Conclusion:PFG is a useful,convenient and less complication method for patients who are contraindication for PEG.

Objective To identify the relationship between the clinical characteristics and prognostic factors in sequentially occurring primary cancers of the breast and ovarian.Methods Clinical and pathological data of 44 cases of successive primary cancers of the breast and ovarian in each single patient diagnosed in Tianjin Medical University Cancer Institute and Hospital from 2000 to 2013 were retrospectively analyzed.Results The median overall survival of all patients with double primary cancers of breast and ovarian was 264 months.3-year overall survival rate was 95.3％ and 5-year overall survival rate was 83.0％ respectively.32 patients were first diagnosed with breast cancer and 12 patients firstly suffered from ovarian cancer.The interval between breast cancer and ovarian cancer was 1-240 months (median 60 months).The staging of ovarian cancer (P =0.005) is the main prognostic factor.In patients firstly diagnosed breast cancer,age (P =0.025) and chemotherapy(P =0.010) were mainly associated with the interval between breast cancer and ovarian cancer.Age when first cancer diagnosed,tumor size of the breast and staging of ovarian cancer were mainly prognostic factors.Age when breast cancer diagnosed and chemotherapy were factors impacting the interval of breast cancer and ovarian cancer.Conclusions For patients with sequentially diagnosed primary cancers of the breast and ovarian cancer,late stage ovarian cancer predicts a poor prognosis.The interval in patients aged 50 and below suffering from secondary cancer is long.Proper chemotherapy for breast cancer seems to delay the occuring of ovarian cancer.

A 27-peptide,a fragment of hepatitis delta antigen(HDAg),was synthesized and used to develop an ELISA method for ihe detection of anti-HD.It was found that positive anti-HD reaction occurred between the coated 27-peptide and a stored sample of serum which was known anti-HD positive.Absorption test revealed that the synthetic peptide competed with natural HDAg for anti-HD,suggesting that the peptide possessed the antigenicity similar to that of natural HDAg.The antigenicity of the synthetic peptide was quite specific wihtout cross reaction with normal human and mouse sera and with anti-HA.anti-HB and anti-HC sera.Among 300 blood donors,there was only 1 case(0.33%)anti-HD positive with an ALT level 2 times higher than normal.In 41 cases of non-B hepatitis and 52 cases of HAV hepatitis,none was anti-HD positive.In 211 cases of various types of HBV hepatitis,21 were(9.95%)anti-HD positive,among whom 2/82(2.5%)werehealthy HBV carriers,6/43(13.95%)were patients with a-cute icteric hepatitis,6/60(10.00%)were patients of chronic active hepatitis,4/18(22.20%)were patients of severe hepatitis,and 3/8(37.50%)were those with liver cirrhosis.These results were consistent with those in our previous reports.