Objective To clone and identify neurotrophic factor NT3 gene from mouse liver so as to establish a cell strain expressing high level of NT3 gene. Methods The target genes amplified by RT PCR were cloned into the shuttle vector pExchange 1neo, and then the DNA sequence was analyzed by enzyme digestion and sequencing. The recombinant expression vector pExchange NT3 1neo was employed to transfect the embryonic stem cell strain MESPU35, and then the transfected cells were selected by G418. The NT3 level in the transfected cells was detected by RT PCR. Results A gene fragment of 777 bp was obtained by RT PCR, and the DNA sequence was identical to mice NT 3 gene sequence of GenBank. The recombinant vector was constructed successfully and the constructed cell strain could express high level of NT 3 gene. Conclusion The successful cloning of NT3 gene from mouse liver, construction of pExchange NT3 1neo expression vector, and establishment of cell strain stably expressing high level of NT3 gene have laid a foundation for the further studies.

The characteristic feature, tissue structure and chemical composition of primitive bark and one to four years regenerated bark of Eucommia ulmoides were compared, and the contents of elastic rubber thread, chlorogenic acid and ethanolic extract of the two barks were determined Res ilts showed that regeaerated bark is of the same quality as primitive bark.

Objective To develop a virtual endoscopy system which can be integrated into PACS.Methods Key techniques on virtual endoscopy were researched and we implemented a virtual endoscopy system with the help of the Visualization Toolkit VTK.Results The Virtual endoscopy system was integrated into PACS and the post-processing function of PACS was advanced.Conclusion As a novel medical image post-processing technology,virtual endoscopy provides a completely non-invaded inspection,so it has broad application prospects in the computer-aided medical teaching,surgical navigation,surgical planning and clinical diagnosis.

Objective: 3D segmentation is an important part of medical image analysis and visualization. It also continues to be large challenge in the medical image segmentation. While level sets have demonstrated a great potential for 3D medical image segmentation, these algorithms have a large computational burden thus are not suitable for real time processing requirement. To solve this problem, we propose a parallel accerelated method based on CUDA. Methods: We implement C-V level set algorithm in the CUDA environment which is the NVIDIA's GPGPU model.The segmentation speed can greatly improved by using independence of image pixel and concurrence of partial differential equation .The paper shows the flow chart of the parallel computing and gives the detailed introduction of the C-V level set algorithm which is implemented in the CUDA environment. Results: Realizing the C-V level set parallel accerelated algorithm. This method has faster segmentation speed while preserving the qualitative results, Conclusions: This method is viable and makes the fast 3D medical image segmentation come hue.

Objective To explore the clinical effects of correction the midface depression.Methods From Aug.2010 to Aug.2015,185 cases of midface depression (aged from 18 to 61 years)were corrected by using structural fat grafting technique,the site and volume were placed as follows,tear trough 1ml,lid cheek groove 2 ml,midcheek groove 0.5 ml,anteriorcheek 4-8 ml,nasolabial fold 1-2 ml,nasal alar base 1-2 ml,evator labii superioris 1-2 ml,zygomaticus major 1-2 ml,buccinator 1-3 ml,and upper lip 3-5 ml.Results 185 cases were followed from 3 months to 3 years and the results were evaluated by visual analogue scales;156 cases of midface depression were corrected after the first structural fat grafting,the midface changed from concave to convex,and acquired prominent malar became more attractive;satisfaction of visual analogue scales were more than 80 ％;only 12 cases needed a second grafting.Conclusions The midface concavity can be corrected effectively by using structural fat grafting technique,the results are satisfied and the technique is safe,simple and effective.

The build-in low-pressure monolithic column combined with hydride generation atomic fluorescence spectrometry ( HG-AFS ) was employed for speciation analysis of fish meat. The sample pretreatment and separation approach could be accomplished within 30 min. The proper amount of fish sample was weighed and smashed into puree. The extraction solution composed of 10% HCl, 1% thiourea, and 0. 15% KCl was added before loaded into the automatic temperature controlled vertex system with 2000 r/min. The sample solution was separated through Merck monolithic column, with 3% ( V/V) acetonitrile, 30 mmol/L amonium acetate and 0. 03%(V/V) 2-mercaptoethanol (2-ME) as the eluent. The after-column eluent was digested by novel UV digestion device with pipeline sintered into the lamp, and then detected by hydrid-generation AFS. The rapid LC separation enabled fast mercury speciation of fish sample within 10 min. The different UV lamp digestion effects, eluent components, carrier gas, shield gas, lamp current, as well as PMT working power was optimized. Under the optimal conditions, the robust system achieved detection limits (DL) of 0. 15 μg/L and 0. 14 μg/L for methylmercury and HgⅡ, respectively. The RSD (n=7) was less than 5%, the linear correlation coefficient was 0 . 999 , and the matrix spiked recovery was in the range of 85%-110% for Hg speciation. This method was used for the determination of Hg speciation in fish and soil samples, and was proofed to be a reliable, easy approach for daily inspection.

Objective: Real time medical image registration technique is one of the key techniques in image based surgery navi-gation system. While in medical image analysis, image registration is usually a very time-cousuming operation, and this is not conducive to clinical real-time requirements. This paper studies and realizes the acceleration of the process of image registra-tion. Methods: In order to improve the regisWation rate, in this paper, we propose a new technology which is based on CUDA (Compute Unified Device Architecture) programming model to accelerate the process of registration in hardware, using paral-lel methods to achieve pixel coordinate transformation, linear interpolation, and calculate the corresponding pixel gray value residuals. Results: The registration is up to the sub-pixel level and the GPU-based registration is dozens or even hundreds of times faster than CPU-based registration. Conclusions: This method greatly enhances the speed of rigid registration without changing the alignment accuracy.

Objective To isolation and identify the pathogen of stem blight of Malvaceae.Methods The stems were collected from stem blight-diseased plants (J) and healthy ones (W) of Abelmoschus manihot (L.) Medic.in Yixing City of Jiangsu Province then cultured to isolate newborn mycelium.The pathogen isolated but unidentified were inoculated in stems of healthy plants of Abelmoschus manihot ( L.) Medic.and pathogenicity was verified.Finally, the pathogenic specie( s) was or were identified by morphological characteristic, rDNA-ITS analysis and polymerase chain reaction (PCR) method.Results The same fungus were excluded which were the same species in J and W, the three fungus of J2, J5 and J6 were acquired.J5 was preliminarily identified to have pathogenicity and it was Fusarium equiseti under the microscope.The genome DNA of J5 was amplified to a length of 524bp, and homology highly with Fusarium equiseti (100%).Conclusion The pathogen was identified as Fusarium equiseti.

Objective To relatively prolong the length of C7 nerve through microanatomical study and carry out direct anastomosis between the end of avulsed nerve and contralateral C7. Methods Fifteen cadaveric specimens and 30 sides of the adult brachial plexus was dissected. The C7 nerve was confirmed and measured by using electric vernier caliper. Parameters as follow: the length of C7 nerve from root to trunk; the length of C7 nerve from root to division(anterior and posterior division); transverse and longitudinal diameter of C7 nerve in root site, combination site between trunk and division, end site of anterior and posterior division. After dissected the nerve adventitia of binding site between division and cord and cut the distal end of anterior and posterior division, the length of C7 nerve from root to division (anterior and posterior division)was measured again. Results The measured result of the length C7 nerve: the length of C7 from root to trunk: (45.87 ± 10.43)mm; Before micro-dissected, the length of C7 from root to anterior division: (61.14 ±13.44)mm; the length of C7 from root to posterior division: (54.63 ± 11.35)mm after micro-dissected, the length of C7 from root to anterior division: (74.67±12.86)mm; the length of C7 from root to posterior division:(68.73± 11.86)mm; the prolonged length of anterior division: (13.15± 4.26)mm; the prolonged length of posterior division: (14.21 ± 6.98)mm. Conclusion Through dessecting the adventitia of binding site of division (anterior and posterior division) and cord of C7 nerve. The length of C7 nerve can be relatively prolonged.

Objective To determine the median effective dose (ED50 ) of ropivacaine for spinal anesthesia when combined with sufentanil in patients undergoing caesarean section. Methods Twenty-eight ASA Ⅰ or Ⅱ parturients, aged 18-40 yr, weighing 50-110 kg, undergoing cesarean section under combined spinal-epidural anesthesia, were enrolled in this study. Combined spinal-epidural anesthesia was performed at L2,3 interspace. The mixture of ropivacaine and 5 fig sufentanil was injected into the subarachnoid space over 30 s. The initial dose of ropivacaine was 11 mg. The dose was increased/decreased by 1 mg in the next patient. The ED50 and 95% confidence interval were calculated by up-and-down method. Results The ED50 of ropivacaine was 7.780 mg (95% confidence interval 6.850-8.836 mg). Conclusion When combined with sufentanil 5 μg, the ED50 of ropivacaine for spinal anesthesia is 7.780 mg in patients undergoing caesarean section.