[Objective]To compare the value of the MR imaging and arthroscopy for detecting articular cartilage erosion,and to evaluate the clinical effect of MR imaging on the correct diagnosis in the early stage of articular cartilage lesion.[Method]Twenty-six patients(27 knees)with persistent knee pain who were scheduled for arthroscopy underwent MR scanning,including 3D FS-FSPGR,FSE PDWI and FSE T1WI sequences.The results of each sequence were then compared with the arthroscopic findings.[Result]Using arthroscopic results as the standard of reference,the 3D FS-FSPGR images had the higher sensitivity(96.5%)and accuracy(95.0%)than the standard MR imaging,the 3D FS-FSPGR sequence was well consistent with the result of arthroscopic,Kappa value was higher(0.776)than the other sequences(P

Objective To reseach the way of rising resectable rate,reducing operative mortality,enhancing long-term effect and higher life quality in postoperation for cancers of esophagus and gastric cardia.Method Operation outcome of 2837 cases for cancers of esophagus and gastric cardia and followed-up were analysed.Results Overall resectability was 98.7%,and postoperative mortality was 0 92% in the group.Survival rates of 3 and 5 years were 48.9% and 33.7%,respectively.Factors affecting long-term survival were those of depth of tumor invasion and lymph nodes metastasis and oncologic staging.It was higher for cervical lymph nodes metastasis within 3 years after operation.Conclusions Early discovery and timely treatment,an appropriate enlarging resectable field and comprehensive therapies are the key to improve the long-term survival.

Objective To investigate the therapeutic effects of mesenchymal stem cells (MSCs) on N-methyl-N-nitrosourea (MNU)-induced retinal degeneration in C57BL mice.Methods Different doses of MNU (30 mg · kg-1,45 mg · kg-1,60 mg · kg-1,75 mg · kg-1 and 90 mg · kg-1) were injected to C57BL mice for 7 days.Then electroretinogram (ERG) detection and HE staining were performed to examine retinal electrophysiological function and morphological changes on day 1,day 3 and day 7 after MNU treatment,respectively.Then we could explore the optimum condition to establish stable animal model of retinitis pigmentosa.MSCs were transplanted to C57BL mice by intravitreal or tail intravenous injection.Then ERG detection and HE staining were performed to evaluate the effect of MSCs on retinitis pigmentosa induced by MNU.Results When compared with control group,30 mg · kg-1 and 45 mg · kg-1 MNU could cause mild retinal damage in morphology and function in mice;while 60 mg · kg-1 and above dose of MNU induced serious retinal damage,leading to decreased ERG amplitude of the retina (all P ＜ 0.001) and outer nuclear layer (ONL) thickness (all P ＜ 0.001).On day 1 and day 3 after single dose of 60 mg · kg-1 MNU injection,ERG amplitude of the retina was decreased,and outer nuclear layer thickness became thin;while the retinal damage was serious badly in morphological structure on day 7,with the ERG amplitude extinguished (all P ＜ 0.001),ONL thickness thin (all P ＜ 0.001) and internal and external nuclear layer fusion.When compared with MNU alone treatment group,following injection of 60 mg · kg-1 MNU for 1 day MSCs were transplanted to C57BL mice by intravitreal or tail intravenous injection,and the amplitude of ERG and retinal ONL thickness were increased on day 7 after MSCs transplantation (all P ＜ 0.001).Conclusion MSCs transplantation has a certain therapeutic effect on MNU-induced retinitis pigmentosa in C57BL mice.

Objective:To display human CD137 extra-cellular domain on phage using phage display technique and detect its antigenicity and bioactivity.Methods:CD137 extra-cellular gene was amplified from CIS plasmid using PCR and then clone it into pComb3HSS.The recombinant pComb3H-CD137 was transfected into competent bacteria XL1-Blue, then the transfected bacteria was co-infected with help phage VCSM13 and CD137 extra-cellular domain was displayed on the phage surface. The antigenicity and bioactivity of CD137 displayed on phage was detected by ELISA and inhibition assay of lymphocyte proliferation(MTT).Results:CD137 PCR products was 525 bp, the recombined plasmid was named pComb3H-CD137, CD137 was displayed on phage. ELISA detection showed that phage displayed CD137 possesses antigenicity of human CD137. MTT inhibition assay showed that lymphocytes proliferation stimulated by PHA and CD137 could be inhibited by phage displayed CD137, indicating that it has bioactivity of nature CD137.Conclusion:The studies demonstrate that phage display system can display human CD137 extra-cellular domain homodimer with antigenicity and bioactivity.

Objective To investigate the clinical effects of high-density micropulse photocoagulation (HD-SDM) combined with intravitreal injection of ranibizumab for diabetic macular edema (DME).Methods Thirty-one patients (31 eyes) with DME were randomly divided into two groups.Group A (15 eyes) received HD-SDM combined with intravitreal injection of ranibizumab.Group B (16 eyes) only received intravitreal injection of ranibizumab.The best corrected visual acuity (BCVA) and central macular thickness (CMT) of the two groups before and after treatment were analyzed,and the annual injection times of the two groups were compared.Results The average annual injection times was 3.67 ± 1.11 in group A,and 9.12 ±2.63 in group B.The difference was significant between the two groups (t =2.05,P ＜ 0.05).There were significant differences in CMT before and after treatment in both groups (all P ＜ 0.05).There was no significant difference in CMT between the two groups(t =1.19,P ＞ 0.05).There were significant differences in BCVA before and after treatment in both groups (all P ＜ 0.05),but there was no significant difference before and after treatment between the two groups(all P ＞ 0.05).Conclusion Both HD-SDM combined with intravitreal injection of ranibizumab and single intravitreal injection of ranlbizumab are effective for DME,but the combining treatment can remarkably decrease the annual injection times and had a good compliance of patients,is a good choice for DME patients.

Objective To evaluate the effectives of high-frequency oscillatory ventilation (HFOV)in the treatment of severe NRDS.Methods The severe NRDS who failed to response to conventional mechanical ventilation (CMV) were changed to HFOV treatment.Ventilator parameters and blood gas analysis were compared before and after treatment.Results Among thirty patients,19 cases were significantly improved and 11 cases were failed,the success rate was 63％.Nineteen patients with HFOV,the main ventilator parameters and blood gas results such as FiO2 ( 0 h:0.87 ± 0.09 vs 3 h:0.67 ± 0.10,6 h:0.54 ±0.08,12h:0.44 ±0.08),MAP[0 h:(14.47 ±1.17) mbar vs 3 h:(13.79 ± 1.03) mbar,6 h:(13.26 ±1.05) mbar,12 h:( 12.37 ±0.83) mbar],f[0 h:(7.26 ±0.56) Hz vs 3 h:(7.89 ±0.57) Hz,6 h:(8.42±0.51 ) Hz,12 h:(9.26 ±0.45) Hz] and PaCO2 [0 h:(9.69 ±0.86) kPa vs 3 h:(6.00 ±0.55) kPa,6 h:(5.62 ± 1.03)kPa,12 h:(5.47 ±0.55)kPa] were decreased while pH(0 h:7.21 ±0.06 vs 3 h:7.35 ±0.07,6 h:7.39 ±0.07,12 h:7.40 ±0.06) and PaO2[0 h:(5.46 ±0.82)kPa vs 3 h:(7.92 ± 1.13)kPa,6 h:(9.25 ± 0.99)kPa,12 h:(9.20 ± 0.96)kPa] were significantly increased compared with before treatment ( P ＜ 0.05).Conclusions The patients of severe NRDS who failed to response to CMV were treated with HFOV,some patients received a significant effect with HFOV treatment.

Objective To evaluate the technical method,clinical effect,safety and complication of the endovascular interventional therapy of intracranial A1 segment aneurysms of anterior cerebral artery(ACA).Methods The data of 14 cases with ruptured A1 segment aneurysms received interventional therapy were analyzed retrospectively.All patients were admitted with subarachnoid hem-orrhage (SAH)and classified by Hunt-Hess scale.There were 3 cases of Grade Ⅰ,5 cases of Grade Ⅱ,and 6 cases of Grade Ⅲ. One of fourteen patients was treated by stent implantation alone and 10 patients were treated by coiling alone.The other 3 patients were treated by stent-assisted coiling.Results All the cases were embolized successfully and cured.Angiography immediately after procedure showed Raymond Ⅰ in 1 1 patients,RaymondⅡ in 2 patients and Raymond Ⅲ in 1 patient.In one patient a coil loop was partly left in the parent artery.All of them showed excellent outcome without any serious complication except that one patient suf-fered transient left hemiparesis.Conclusion Endovascular interventional therapy is a safe,effective method in the treatment of the intracranial A1 segment ACA aneurysms.

To discuss IC50 application in cytotoxicity tests of medical devices, we firstly investigated the vibrating condition and endpoint of MTT method specified in ISO 10993-5: 2009. Furthermore, we demonstrated the application of IC50 in the result evaluation of MTT method. The experimental results show that usage of IC50 in quantitative evaluation of MTT method is feasible.
Equipment and Supplies ; adverse effects ; standards ; Inhibitory Concentration 50 ; Toxicity Tests ; methods

Objective To discuss the safety,efficacy and time window of thombolysis using recombinant staphylokinase(r-Sak).Methods The model of acute cerebral infarction was established with interventional embolization technique in 24 adult beagle dogs,which were randomly divided into 3 groups including control group,6 h intra-arterial group and 3 h intravenous group.Angiography was performed before thrombolysis.We administered r-Sak for thrombolysis(10 ml of saline in control group,0.2 mg/kg of r-Sak in the intra-arterial group through left internal carotid artery 6 h after embolization,and 0.2 mg/kg of r-Sak in the intravenous group through femoral vein 3 h after embolization).Follow-up angiography was repeated half,1 and 2 hours after thrombolysis.The plasma levels of PT,APTT and D-dimer were assayed at the time points of 30 min before thrombolysis,30 min,60 min and 120 min after thrombolysis.These canines were sacrificed,and their brains were taken out for pathological study at 24 hours after embolization.Results The recanaled vessels at 2 hours after thrombolysis was 11(11/13) in the intra-arterial group,8(8/11) in r-Sak intravenous group and 1(1/10) in control group,and the vessels of complete recanalization was 6(6/13),2(2/11) and 0(0/10),respectively.There were statistically significant differences among the three groups (P=0.001 and P=0.035 respectively),but there were no statistically significant differences between the intra-arterial and the intravenous groups (P=0.630 and P=0.211).The PT and APTT are significantly prolonged in the thrombolytic groups.The levels of D-dimer was not changed after thrombolysis (P＞0.05). All dogs were alive 24 h ours after embolization.The clinical presentations in the thrombolytic groups were better.Pathologically,there were no cerebral hemorrhage in all groups.Conclusion r-Sak has strong effect of thrombolysis,and its complication of intracerebral hemorrhage is rare.The intra-arterial thrombolysis 6 h after embolization using r-Sak is safe and effective.

Flashing light effect on microalgae could significantly improve the light efficiency and biomass productivity of microalgae. In this paper, the baffles were introduced into the traditional flat plate photobioreactor so as to enhance the flashing light effect of microalgae. Making Chlorella sp. as the model microalgae, the effect of light intensity and inlet velocity on the biomass concentration of Chlorella sp. and light efficiency were evaluated. The results showed that, when the inlet velocity was 0.16 m/s, with the increase of light intensity, the cell dry weight of Chlorella sp. increased and light efficiency decreased. With increasing the inlet velocity, the cell dry weight of Chlorella sp. and light efficiency both increased under the condition of 500 μmol/(m2 x s) light intensity. The cell dry weight of Chlorella sp. cultivated in the novel flat plate photobioreactor was 39.23% higher than that of the traditional one, which showed that the flashing light effect of microalgae could be improved in the flat plate photobioreactor with inclined baffles built-in.
Biomass ; Chlorella ; growth & development ; Culture Techniques ; instrumentation ; Light ; Microalgae ; growth & development ; Photobioreactors