Objective To synthesize 628F-Py-AMD3465,to investigate its biodistribution in mice and to perform the microPET/CT imaging on mice bearing human lung cancer cell (A549).Methods AMD3465 quaternary ammonium salt precursor was directly labeled with 18F,then 628F-Py-AMD3465 was synthesized through nucleophilic reaction,hydrolysis,neutralization and the product was purified using HPLC.The labeling yield and radiochemical purity were analyzed by HPLC.Fifteen Kunming mice were injected with 5.55 MBq of 628F-Py-AMD3465 and sacrificed at 5,20,40,60 and 120 min postinjection.The selected tissues were harvested and weighed,and the radioactivity in the tissues was measured by an automated γ-spectrometer.The ％ID/g was calculated.MicroPET/CT studies were performed on A549-bearing mice after injecting 6-18F-Py-AMD3465 through vena caudal.Paired t test was used.Results 6-18F-Py-AMD3465 was successfully synthesized with the labeling yield of (9.0±2.0)％,the total synthesis time was about 60 min,and the radiochemical purity was more than 98％.Biodistribution studies showed that the radiouptake was higher in the kidneys and bladder of normal mice,which demonstrated that 6-18 F-Py-AMD3465 was mainly excreted through the kidneys.Biodistribution in A549-bearing mice was similar to that in normal mice.The tumor/muscle ratio at 40 min was 5.0,but the radiouptake of the tumor was still lower than that of the normal lung:(8.05±0.35) ％ID/g vs (9.33±0.66) ％ID/g;t=5.26,P＜0.05.MicroPET/CT imaging showed that the high-uptake location of 6-18F-Py-AMD3465 in tumor-bearing mice was similar to the normal mice,and the tumor uptake reached the maximum level at 45 min post-injection (SUV 0.67).Conclusions 6-18F-Py-AMD3465 can be synthesized by a simple method.A lower uptake could be shown in the tumor compared to that in the lung and the tracer has limited diagnostic value for lung cancer.

Objective To probe the effect of c-fos gene on the pentyleneterazol-induced hippocampal neurons apoptosis.Methods Using immunohistochemistry,TUNEL and flow cytometry(FCM),we detected the Fos expression and the apoptosis of hippocampal neurons;we injected c-fos antisense into ventrile before epilepsy and detected as up.Results Epilepsy can induce the expression of Fos in the hippocampus and peaking at 1 h(P

Objective To establish erythromycin resistance models of Streptococcus pneumoniae for analysis of the mutations in the binding domain of erythromycin. Methods Streptococcus pneumonia tigr4 and two clinical sensitive isolates were induced with erythromycin by minimum inhibitory concentration (MIC) method for antimicrobial susceptibility, and then the rplD, rplV genes, and 23S rRNA in sensitive and resistant strains were amplified by PCR and RT-PCR for sequencing. CPHmodels-2.0 was used to predict the spatial structures of ribosomal protein L4 and L22 coded by rplD and rplV genes. Results MIC of Streptococcus pneumonia tigr4 increased from 0.0312 mg/L to 256mg/L while MICs of the two clinical isolates increased from 0.0312 mg/L to 32 mg/L. Comparison of the pre-and post-induction results showed V32A mutation in ribosomal protein L4, D35G mutation in ribosomal protein L22, and 67QK68 to 67RE68 mutations in ribosomal protein L4. Changes in spatial structure was found in SiThe ribosomal protein L22 and ribosomal protein L4 due to D35G, Q67R, and K68E mutations respectively. Conclusion Streptococcus pneumonia can be induced to resistant to erythromycin in vitro. The mechanisms of resistance may be relate to the new mutations in the binding domain of erythromycin.

BACKGROUND: Minimally invasive transforaminal interbody fusion (Mis-TLIF) for spondylolisthesis has been introduced to reduce muscle trauma, minimize blood loss, and achieve earlier rehabilitation. However, there is a lack of evidence-based medicine concerning the therapeutic efficacy of Mis-TLIF versus open TLIF for spondylolisthesis. OBJECTIVE: To systematically evaluate the clinical efficacy and safety of Mis-TLIF versus open TLIF for spondylolisthesis.METHODS: WanFang, CNKI, PubMed, and Cochrane Library databases were searched using the keywords of spondylolisthesis, minimally invasive transforaminal interbody fusion, open transforaminal interbody fusion in English and Chinese, respectively. The quality evaluation and data extraction of the included literatures were conducted by two authors independently. A meta-analysis was performed on RevMan 5.3 software.RESULTS AND CONCLUSION: Ten literatures were included, including 7 retrospective and 3 randomized controlled trials; 963 cases were enrolled (489 cases of Mis-TLIF, 474 cases of open TLIF). (1) Meta-analysis results showed that there were no significant differences in the operation time, postoperative complication rate, and fusion rate at the last follow-up between two groups, suggesting that the two methods expose analogical effects on the pain relief and functional recovery. (2) There were significant differences in the intraoperative blood loss and radiological times between two methods. (3) To conclude, Mis-TLIF holds similar operation time, incidence of complications and functional recovery with open TLIF, accompanied by minimized trauma, and reduced intraoperative and postoperative blood loss, which is considered as a safe and effective surgical method.

Objective To investigate the feasibility of percutaneous transforaminal endoscopic spine system in thoracic discectomy for disc herniation. Methods One patient with thoracic disc herniation involved the level of vertebral segment in T11/12 was treated with percutaneous transforaminal endoscopic spine system and followed up for 1 month. The targeted puncture was performed under local anesthesia and fluoroscopic guidance with patient in prone position. The foramen of T 11/12 was enlarged gradually with four trephinations, and the working cannula was inserted transforaminal into the canal. Then the herniation was exposed and removed with full endoscopic technique, including the loosen nucleus pulposus. The dural sac was exposed and released adequately. Drainage was placed during operation. Results The procedure was successfully carried out and the dural sac was completely released. The drainage was removed in the second day of operation. The patient could walk in the third day after operation with obvious relief of back and leg pain. At the follow-up of one month postoperation, the visual analogue scale of leg pain decreased from 8 to 1, and the Oswestry disability index (ODI) decreased from 64 to 4. According to MacNab scale, excellent result was acquired. Conclusion There is the feasibility of the percutaneous transforaminal endoscopic spine system in thoracic discectomy for disc herniation. It is a good minimal invasive technique with good results and high technical requirements for surgeons.

Objective To identify the variation in the Env region of SHIV-XJ02170 during passaging in Chinese origin Rhesus Macaques.Methods Fragments of the SHIV-XJ02170 gp160 and gp120 gene were amplified by PCR and RT-PCR separately from the blood samples of SHIV-XJ02170 infected animals at the peak viral load time point.Purified RT-PCR product was ligated into T easy vector and transformed into JM109 competent cells,18 clones were selected by PCR method and sequenced by ABI 3730DNA sequencers.The gene distances(divergence,diversity)were calculated using DISTANCE.Results In all,the SHTV-XJ02170 gp120 gene evolved forward along the virus passaging.It could be found that viral divergence from the founder strain serially enhanced during in vivo passaging,but in the early phase of each passage,SHIV-XJ02170 gp120 gene evolved toward ancestral state upon transmission to a new host.All of the SHIV-XJ02170 strains had V3 loop central motif(GPGQ)and were predicted to be using CCR5 on the basis of the critical amino acids within V3 loop.Conclusion There was significant increase in the genetic distance during serial passaging,and SHIV-XJ02170 gp120 gene evolved forward along passaging.This could partly explain why the virus infectivity was enhanced during in vivo passaging.

Objective To analyze the virologic and immunologic properties during SHIV-XJ02170passage in vivo and construct the clade C SHIV/Chinese origin Rhesus macaques AIDS model . Methods SHIV-XJ02170 cell-free virus tranfected in 293T was adapted by serial passage in nine Chinese-origin Rhesus macaques. CD4/CD8 ratio was detected by flow cytometry to analyze the changes in viral pathogenicity. Real-time RT-PCR and IFN-γsecreting ELISPOT methods were used to analyze changes in characteristics of virology and immunology. Results During in vivo passage, CD4/CD8 ratio did not deeply decline. However,the peak and setpoint viral load in the line 3 show a continuous upward trend. The strong humoral and cellular immune responses were induced after SHIV-XJ02170 infection. Meanwhile, there was significant positive correlation between the viral load and binding antibody titer. Conclusion There were no pathogenic viral strains, and upward trend in virulence of SHIV-XJ02170 was found during in vivo passaging. SHIVXJ02170/Chinese origin Rhesus macaques model will play an important role in effect evaluation of candidate AIDS vaccines in China.

Fourteen psychrotrophic bacteria were isolated from swamp soil collected in Ruoergai plateau wetland,and their generation time and degrading ability of livestock wastewater CODcr was determined.The results showed that the generation time was within 4.9 h to 11.6 h.Based on the generation time,9 psychro-trophic strains(NLJ1,NLJ6,NLJ7,NLJ9,NLJ10,NLJ11,NLJ12,NLJ13 and NLJ14),whose generation time was within 4.9 h to 5.6 h,were chosen to treat livestock wastewater.The results suggested that these 9 strains had different CODcr disposal ability when treating livestock wastewater singly at 6?C for 6 h,and strains NLJ6,NLJ7,NLJ9,NLJ10,NLJ11 and NLJ13 had good ability to degrade livestock wastewater,the CODcr degrading rate was about 60%~70%,hence,they were used as high efficient strains;However,the CODcr degrading rate of the other strains was less than 50%.After inoculating mixture culture of these six strains into the distilled livestock wastewater,after 6 h's treating,the CODcr degrading rate reached to 85.42%.Furthermore,activated sludge collected from Yaan,Dujiangyan and Chengdu were inoculated by the mixture culture of those six strains,and used to treat livestock wastewater for 6 h.The results showed that the average CODcr degrading rate was 81.67%,76.32% and 70.56%,respectively;Variance analysis showed that there was no significant differentiation between each treatment,which revealed that those six psychrotrophic strains had good adaptability to different source of activated sludge.

BACKGROUND:Clinical physicians should pay attention on how to reduce ankle fracture healing wounds, reduce bleeding, improve operating technique, and improve repair effect, especialy for comminuted fracture. It is necessary to understand how to develop a detailed plan before repair, observe specific circumstances of the fracture from multiple angles, and establish three-dimensional images using two-dimensional X-ray films or CT scan. These raise a chalenge for each physician. OBJECTIVE:To explore the application effect of three-dimensional print, minimaly invasive percutaneous screw and locking plate fixation in the repair of ankle fractures. METHODS: A total of 26 cases of fracture of ankle joint were treated from January 2012 to June 2014. There were 9 cases of double ankle fracture, 12 cases of three ankle fractures, and 5 cases of three ankle fractures involved PILON fracture on the lower tibia. They received spiral CT scanning on the ankle joint, and stored in the format of di.com. After processing with minics software, data were converted into STL format, and then input into the three-dimensional printer. Thus, models of ankle joint were made at the ratio of 1:1. The repair scheme was made. After discharge, X-ray films were checked every month to observe the healing condition of fractures. According to Mazur ankle score standard, ankle joint function was assessed. RESULTS AND CONCLUSION: Al 26 cases were folowed up for 6-12 months. The fractures were healed. The healing time was 4-6 months, averagely 5.5 months. The healing was good, without vascular and nerve damage, or plate breakage. In accordance with the Mazur ankle score standard, there were excelent in 11 cases, good in 13 cases with an excelent and good rate of 92%. The operation time was (64±15) minutes, and intraoperative blood loss was (100±15) mL. The incision was healed in stage one. These findings confirm that the simulation training and operation in fracture models of three-dimensional print have smal injuries to patients with ankle fracture. The bleeding was less, the operation was simple, the healing time was short, and the functional recovery was rapid, especialy for comminuted fracture.

Objective To fabricate a silk fibroin scaffold with biomimetic oriented microstructure using the directional crystallization technology, and to evaluate the possibility of application to the cartilage tissue engineering. Methods The silk fibroin scaffold with biomimetic oriented microstructure was made by the directional crystallization technology. The structure of scaffold was observed by the scanning electron microscope, and the pore size, porosity and mechanical properties were calculated. Adipose-derived stem cells were isolated from rabbit, and the passage 3 was seeded into the scaffold. The cell proliferation was detected by CCK8 method. The cell adhesion ability was observed by HE staining and scanning electron microscope. The cell viability was observed by LIVE/DEAD staining. Results The scanning electron microscopy showed that the parallel microtubule-like structure can be seen arranged in longitudinal section of the scaffold, which had a uniform directivity, and also the elliptical or circular pore structure in cross-section. The scaffold had a good pore interconnectivity with (112.43±12.65) μm pore diameter of the cross-section, (90.25±2.05)%porosity and (52.48±5.78) kPa the compression modulus. HE staining and scanning electron microscopy demonstrated that the cells uniformly adhered to the surface and inner pore, and which secreted lots extracellular matrix distributed in the oriented microstructure. Results of CCK8 showed that the good cell proliferation on the scaffold, and the LIVE/DEAD staining indicated that the cells were maintained good viability. Conclusion The silk fibroin scaffolds have a biomimetic oriented microstructure, and show good pore diameter, porosity, biocompatibility and biomechanical properties, which made it a suitable candidate as an alternative scaffold for cartilage tissue engineering.