Gastrointestinal stromal tumor (GIST) is originated from the gastrointestinal mesenchymal stem cells,composed of undifferentiated or pluripotent spindle and epithelioid cells,often occurs in the whole range of the gastrointestinal tract and occasionally in the omentum,mesenterium and other areas which are outside of digestive tract.The treatment is difficult due to broad-spectrum biological behaviour of GIST,while surgery may be the only potential method for curing GIST with a risk of recurrence.Currently,there is still not an evaluative standard in the choice of surgery or imatinib therapy as well as the risk of recurrence.The F/NIH consensus,Armed Forces Institute of Pathology (AFIP) standard,modified standard of National Institutes of Health(NIH) and consensus of mathematical model which have been widely used cannot accurately evaluate risk probability of recurrence,so the current researches have focused on the postoperative risk assessment for GIST.In recent years,the nomogram model has been applied to predict the risk of GIST recurrence by some scholars,with the better outcomes.

Objective To investigate expressions of albumin during retinal neovascularization in a murine model of oxygen -in-duced retinopathy.Methods C57BL/6J mice were exposed to (75 ±2)%oxygen for 5 days and returned to room air to induce retinal neovascularization .Retinal neovascularization was observed by fluorescence angiography , and was quantified by counting the endotheli-al nuclei protruding into the vitreous cavity after hematoxylin-eosin staining.The blood-retina barrier was evaluated by Western blot a-nalysis of extravasated albumin in the retina .Results In fluorescence angiograms , irregular neovascularization and fluorescein leakage was observed surrounding the unperfused areas in the hypoxic group .Compared to the normoxic group , there was a significant increase in both-side retinal albumin protein levels in the hypoxic group at P 13, P15 , and P17.Conclusions Albumin expression was in-creased in murine retina under hypoxia , and might be used to detect blood-retinal barrier damage of oxygen-induced retinopathy .

Long-term potentiation(LTP)is an important form of synaptic plasticity and an objective indicator to investigate learing and memory synaptic mechanisms.With the development of brain slice technology,more and more experiments associated with LTP are carried out on brain slices,which aim to investigate the mechanism in biology and the change in physiology or biochemistry are carried out on the brain slice.This paper gives an overview of recent advances in research of LTP with technology of brain sliceby suchexamples as follows:The regulated expression mechanisms of long-term potentiation at CA1 synapses,the characteristics of LTP induced in hippcampal slices and its relation with the slice-recovery conditions,the enhancement of the magnitude of early longterm potentiation at CA1 hippocampal synapse by the activation of dopamine receptor,and the enhancement of associative long-term potentiation by the activation of β-adrenergic receptors at CA1 synapses in rat hippocampol slices.

OBJECTIVE To evaluate the methods of improving the air quality in the outpatient departmant area.METHODS The amount of outpatients in different time periods in the morning were calculated in the specialist consulting area;the bacteria in the air collected from the clinic room were collected and cultured in general nutrition agar medium and compared the efficacy for the improvement of air quality between the new and the old methods.RESULTS The air quality of the specialist consulting area was improved significantly through the ventilation and cleaning-floors depending on the amount of outpatients(P

OBJECTIVE To survey the knowledge about the prevention by hepatitis B vaccination among vaccine recipients and inquiry persons,and formulate the measure of health education on prevention of HBV. METHODS 349 cases of hepatitis vaccines and inquiry persons in infirmary from Oct 2006 to Feb 2008 were selected,and making questionaire investigation for the understanding of HBV infection. RESULTS The initiative consciousness of prevention to HBV was manily focused on young people. The 20 to 40 years old people were 81%,3% below 20 years and 16% over 40 years among the investegatees. The correct rate of cognition was 36.4%. CONCLUSIONS To propagandize the knowledge about HBV and make the people to understanding the HVB,and increase the consciousness for prevention. To reduce the mistake cognition for HBV infection and encourage the high-risk people to receive the hepatitis vaccination.

Objective To explore a rapid method for classification of microorganisms.Methods The electrophorese fingerprinting, direct sequence of 16S rDNA and 16S-23S rDNA ISR after PCR, multiplex PCR for 16S rDNA and antibiotic resistance genes, were utilized to explore fast approaches of extracting total DNA from different clinical specimens.Results The specific 16S-23S rDNA ISR fingerprinting fragments were shown on the genus or species level in bacteria and fungi.So fingerprinting can be used to identify pathogenic microorganisms, to differentiate the evolution relations or to set the phylogenetic tree by comparing their DNA banding patterns with those of standard strains (NCCLS). Multiplex PCR was able to examine the special genes of genus or species, mecA gene, TEM, SHV and CTX gene in staphylococcus and ESBLs(E.coli or K.pneumoniae) at the same time.Conclusion The part of 16S rDNA sequencing and 16S-23S rDNA ISR genotypes by gel electrophoreses were useful for bacterial species identification in addition, it was clearly more rapid and accurate than culture technique, and the large numbers of strains can easily be examined.Multiplex PCR could provide a good method for identification of microorganisms and analysis of antibiotic resistance at the same time.

Objective To investigate the effect of fast-aging on the excitability of hippocampus CA1 neurons in mouse and the possible interaction between fast-aging and hippocampus. Methods Using brain slice and extracellular recording technique to record the firing of hippocampus CA1 neurons in fast-aging(SA M-P/8) and normal control mice, after preprocessing, neural firing train were obtained. Using neural firing rate and inter-spike-inter to investigate interaction between fast-aging and hippocampal neural firing. Results The neural firing rate of hippocampus CA1 neurons in fast-aging mice is (1.052±0.364) Hz(n=14), while the neural firing ratein normal control mice is (4.416±1.306) Hz(n=22). In fast-aging mice, 80.5% inter spike intervel(ISI) is longerthan 1sec, but in normal control mice, 95.6% ISI is shorter than 0.5sec. Conclusion The decreased firing rate of hippocampus CA1 and longer ISI observed in the fast-aging mice indicates that fast-aging significantly inhibit hippocampal CA1 neurons excitability.

Objective　To study the preventive effect of hepatic metastasis from colorectal cancer and the immune function influence on postoperative patients with colorectal cancer treated by TIL, rIL-2 and cyclophosphamide by portal vein infusion. Methods　One hundred and twenty-four patients with advanced colorectal cancer (Dukes B and Dukes C stage) were randomly divided into immunotherapy group and control group. The control group were treated with 5-Fu and MMC by intravenous injection after resection of colorectal cancer. The immunotherapy group were treated with TIL, rIL-2 and cyclophosphamide by portal vein infusion after resection of the tumor, then with chemotherapy as the control group. All cases were followed-up for 3 years. Results　Eight cases (12.3%) had hepatic metastases from colorectal cancer in the immunotherapy group, but nineteen cases (33.2%) in the control group. There was significant difference between the two groups (P>0.05). The NK, IL-2 activity and CD3, CD4, CD4/CD8 levels in peripheral blood of the immunotherapy group increased significantly after treatment (P<0.05). Conclusions　The TIL, rIL-2 and cyclophosphamide treatment after resection of colorectal cancer is effective in improving antitumorgenic immune function, and preventing hepatic metastases.

An adolescent patient,in the peak of growth and development,with severe skeletal Class Ⅲ malocclusion and maxillary impacted canines was treated by removable and fixed appliances in the upper and lower dental arches.After treatment,the crossbite was relieved,the facial contour was improved,the integrity of the denture was kept and the Class Ⅰ molar relationship was achieved.

Objective To evaluate the diagnostic value of treponema pallidum particle agglutination (TPPA) and toludine red unheated serum test (TRUST) for the therapeutic effects of early syphilis.Methods Syphilis patients visited the Dermatological Department of Beijing Tongren Hospital, Capital Medical University from January 2012 to October 2016 were recruited, including 189 patients with early syphilis and 39 patients without clinical symptoms but with risky behavior within 3 months.Serum samples were tested by TPPA and TRUST respectively before treatment and at month 3, 6, 12 after treatment.Comparison between groups was done by χ2 test.Results Serum TPPA results of 228 patients with early syphilis prior to the treatment and within 12 months after treatment were all positive.Before treatment, TRUST tests results of 225 patients were positive, and 156 patients turned negative after 12 months of treatment with the negative conversion rate of 69.3%.The TRUST titer ≤1∶4 before treatment was defined as low-titer group, and ≥1∶8 before treatment was defined as high-titer group.There were 93 patients in the low-titer group, including 3 patients with negative results, and 90 patients with titer 1∶1-1∶4.There were 135 patients in the high-titer group.Twenty-seven patients achieved TRUST negative conversion after 3 months of treatment, among which 19.35%(18/93) with the negative conversion rate in the low-titer group and 6.67%(9/135) in the high-titer group.The difference between the two groups was statistically significant (χ2=7.10, P<0.01).Sixty-two patients converted into negative results of TRUST assay after 6 months of treatment, including 36.56%(34/93) in the low-titer group and 11.85%(16/135) in the high-titer group whose titer of 1∶1-1∶4, and 6.45%(6/93) in the low-titer group and 4.44%(6/135) in the high-titer group whose titer ≥1∶8 turned negative.The difference between the two groups was statistically significant (χ2=17.10, P<0.01).There were 67 patients converted negative detected by TRUST assay after 12 months of treatment, including 23.66%(22/93) in the low-titer group with titer of 1∶1-1∶4 and 14.81%(20/135) in the high titer group, and 1.08%(1/93) in the low-titer group and 17.78%(24/135) in the high-titer group whose titer ≥1∶8 were turned negative.The difference between the two groups was not statistically significant (χ2=1.51, P>0.05).Conclusion Serological tests combined with clinical signs can accurately diagnose early syphilis and evaluate the therapeutic effects.