Objective To study the effect of once-weekly injection of recombinant human parathyroid hormone rhPTH(1-34) on the healing of bone fracture in rats.Methods Fifty male 3-month old SD rats were used in this study to produce unilateral tibial fracture and received internal fixation with a Kirschner needle.Based on the dose and frequency of rhPTH (1-34) injection, the rats were randomly divided into five groups (n=10 each) as follows: subcutaneous injec-tions of saline, and rhPTH in a dose of 10, 20, 10, and 20 μg/kg/d.After 4 weeks of treatment, the rats were euthana-tized and the fractured tibia were assessed by X-ray, dual energy X-ray absorptiometry ( DXA) ,micro-computed tomography ( microCT) and three-point bending test.Results The fracture healing in the 20μg/kg/w group was better than the saline group.The fracture healing in the 20μg/kg/w group was as well as the 10 μg/kg/dgroup.The BMD of 20μg/kg/w group was 26.2%higher than the saline group.The mineralized callus volume in the 20μg/kg/w group was 51.4%higher than the saline group.The total callus volume in the 20μg/kg/w group was 21.6%higher than the saline group.The ultimate load of the 20 μg/kg/w group was 29.3% higher than the saline group.There was no significant difference between the 20 μg/kg/w group and 10 μg/kg/d group in BMD, bone micro-architecture, and biomechanical strength ( P >0.05 ) . Conclusions Once weekly injection of rhPTH (1-34)can promote the bone fracture healing.

Objective To verify the feasibility and accuracy of the quantitative evaluation of the volume of internal abdominal hemorrhage based on CT images.Methods The clinical data of 76 patients diagnosed as abdominal hemorrhage or hemoperitoneum and performed with emergency surgery in the Second Affiliated Hospital to Wenzhou Medical University from January 2009 to September 2016 were retrospectively analyzed by case-control study.The Noboru Oriuchi's formula was used to calculate the volume of abdominal hemorrhage based on CT images,and the results were compared and adjusted with the volume of actual abdominal hemorrhage recorded during the operation.SPSS 21.0 was used to statistically analyze the data.The linear regression was analyzed on the results measured by the two methods.Results The volume of abdominal hemorrhage measured by the CT calculation method ranged from 10 to 4 335 ml,while the corresponding volume measured by operational calculation method ranged from 200 ml to 4 490 ml.The absolute difference in the volume measured by these two methods ranged from 4.8 ml to 500 ml.The ratio of the absolute difference to the volume of abdominal hemorrhage by operational calculation method ranged from 0.2％ to 95.0％,the median of which was 4.5％ (2.8％,8.9％).When the exact volume of abdominal hemorrhage was ＜ 500 ml,the absolute difference in the exact volume ranged from 30.0％ to 95.0％,the median of which was 69.1％ (51.2％,78.6％).When the volume was less than 500 ml,the ratio ranged from 0.2％-13.6％,the median of which was 4.2％ (2.7％,6.4％).Analysis of the numbers of the two measuring methods with linear correlation method after eliminating the cases in which the bleeding volume was less than 500 ml showed that two methods presented a linear correlation (r =0.971,P ＜ 0.05).Conclusion After the conventional abdominal CT scanning,the Noboru Oriuchi's formula can be used to accurately calculate the volume of abdominal hemorrhage in patients with volume of abdominal hemorrhage more than 500 ml.

Objective To investigate and analyze the behavioral and pathological differences in early-stage mouse models of epilepsy established by 2 different administration routes for kainic acid(KA),intracerebroventricular(ICV)injection and intraperitoneal(IP)injection.Methods A total of 100 male C57BL/6N wild-type(WT)mice(20～22 g)were randomly divided into ICV+normal saline(NS)control group(n=10),ICV+KA model group(n=40),IP+NS control group(n=10)and IP+KA model group(n=40).The ICV+KA model group was given 600 nL of KA(0.5 mg/mL)via ICV injection,and the IP+KA model group was injected with different dose of KA(25 mg/kg).Two control groups were administered equal volumes of NS via corresponding routes.After 3 d of modeling,the evaluation of behavioristics,molecular biology(including Western blotting),and neuropathological assessments(including FJB staining,TUNEL staining and immunofluorescence staining)were performed.Results No epileptic seizures were observed in both 2 control groups,while exhibited seizures were observed in both model groups.The mortality rates of the IP+KA group and the ICV+KA group were 47.50%and 65.00%respectively,while the success rates of modeling were 80.00%and 60.00%respectively.Compared with the IP+KA group,the ICV+KA group showed a significant increase in success rate and a significant reduction in mortality rate.FJB and TUNEL staining results showed that,compared with the IP+KA group,the severity of neurodegeneration and apoptotic changes in the hippocampus of the ICV+KA group were more significant(P＜0.05).Compared with the IP+KA group,there was also a significant difference in the expression of apoptotic proteins in the hippocampus of the ICV+KA group(P＜0.05).Immunofluorescence results showed that the astrocytes and microglia in the hippocampus and cortex of the ICV+KA and IP+KA groups were significantly activated compared with the control groups(P＜0.05),but the activation of glial cells in the hippocampus and cortex of the ICV+KA group was stronger than that of the IP+KA model group(P＜0.05)and the activation levels in the ICV+KA group were higher than in the IP+KA model group(P＜0.01).Moreover,expression levels of GFAP and Iba-1 proteins in the hippocampus and cortex were higher in the ICV+KA group than the IP+KA group(P＜0.05).Conclusion Two routes of KA administration are effective in construct epilepsy models.The mice with ICV administration route show a higher success rate and lower mortality rate,and more significant neuropathological damage and glial cell activation.

Objective To investigate the effects of Danhong injection on electrical activity of rabbit heart. Methods The arterially perfused rabbits left ventricular preparations were used in the experiments. The preparations were stimulated at basic cycle lengths (BCL) of 1000 ms for 1 h before the experiment started. The Danhong injection was set in trial group. Captopril was set as a negative control group and sparfloxacin as a positive control group. The transmural ECG was recorded and QRS duration, QT interval, Tp-e interval and Tp-e/QT ratio were measured. Results Donghong injection had no significant effect on QRS duration in the concentration ranges tested. At concentrations of 20 mL · L~(-1) and 60 mL · L~(-1), Danhong injection could produce a small but statistically significant QT prolongation. However, this effect is comparable to the negative control drug captopril. Both Danhong injection and captopril had no significant effect on Tp-e and Tp-e/QT ratio, also, which did not cause any proarrhythmic events in any preparation at any concentration. Conclusion Danghong injection possesses no significant risk of TdP and other proarrhythmias like ventricular tachycardia in the concentration less than or on the verge of 30 times of free therapeutic plasma C_(max).

Purpose::Under-foot impact loadings can cause serious lower limb injuries in many activities, such as automobile collisions and underbody explosions to military vehicles. The present study aims to compare the biomechanical responses of the mainstream vehicle occupant dummies with the human body lower limb model and analyze their robustness and applicability for assessing lower limb injury risk in underfoot impact loading environments.Methods::The Hybrid III model, the test device for human occupant restraint (THOR) model, and a hybrid human body model with the human active lower limb model were adopted for under-foot impact analysis regarding different impact velocities and initial lower limb postures.Results::The results show that the 2 dummy models have larger peak tibial axial force and higher sensitivity to the impact velocities and initial postures than the human lower limb model. In particular, the Hybrid III dummy model presented extremely larger peak tibial axial forces than the human lower limb model. In the case of minimal difference in tibial axial force, Hybrid III's tibial axial force (7.5 KN) is still 312.5% that of human active lower limb's (2.4 KN). Even with closer peak tibial axial force values, the biomechanical response curve shapes of the THOR model show significant differences from the human lower limb model.Conclusion::Based on the present results, the Hybrid III dummy cannot be used to evaluate the lower limb injury risk in under-foot loading environments. In contrast, potential improvement in ankle biofidelity and related soft tissues of the THOR dummy can be implemented in the future for better applicability.

Polymer-modified gold nanoparticles, which are more stable, less toxic to human body and have improved biocompatibility, have received intensive attention in biomedical applications, which can be used as or construct various therapy agents or carriers in cancer treatment. This review summarizes the current investigation of polymer-modified gold nanoparticles on their cancer treatment applications.

The construction of brain functional network based on resting-state functional magnetic resonance imaging (fMRI) is an effective method to reveal the mechanism of human brain operation, but the common brain functional network generally contains a lot of noise, which leads to wrong analysis results. In this paper, the least absolute shrinkage and selection operator (LASSO) model in compressed sensing is used to reconstruct the brain functional network. This model uses the sparsity of
Algorithms ; Brain/diagnostic imaging* ; Humans ; Image Processing, Computer-Assisted ; Magnetic Resonance Imaging