BACKGROUND:Pedicle screw internal fixation is a commonly used method to treat osteoporotic fracture. Internal fixation can effectively reconstruct vertebral body height, restore physiological curvature, and maintain good spinal stability. OBJECTIVE:To investigate the biocompatibility of minimal y invasive percutaneous pedicle screw (Sextant) fixation in the treatment of elderly patients with osteoporotic vertebral fractures. METHODS:A total of 71 cases of senile osteoporotic vertebral fractures were given minimal y invasive percutaneous pedicle screw (Sextant) fixation for treatment. The C-arm X-ray machine was used to accurately locate the fracture vertebral body in different patients, and the corresponding surface was marked. In order to separate the subcutaneous tissue and fascia layer, the internal fixation with Sextant screw was used. 12 months after operation, the fixator was removed. The patients were fol owed up for 12 months, complications and tissues surrounding the fixator were observed. At 1, 3, 6, and 12 months after treatment, changes in Cobb angle, visual analogue scale score and Oswestry disability index were observed. RESULTS AND CONCLUSION:(1) The average operation time was 90.25 minutes;intraoperative blood loss was 85.15 mL. (2) At different time points after treatment, Cobb angle, visual analogue scale score and Oswestry disability index of the patients were significantly decreased at 1 month after treatment, and maintained stable from then on. Cobb angle, visual analogue scale score and Oswestry disability index were significantly less at 1, 3, 6 and 12 months after treatment compared with that before treatment (P<0.05). There was no significant difference in each indicator at different time points after treatment (P>0.05). (3) Two patients affected wound infection, and were cured after symptomatic treatment. No complications such as thrombosis appeared. During removal of the screw, surrounding tissues were observed. There was no inflammatory hyperplasia of soft tissue around the fixator. No fibrous tissue or black wal was found. (4) These results confirm that Sextant minimal y invasive pedicle screw internal fixation in elderly patients with osteoporotic vertebral fractures can obtain satisfactory therapeutic effect, and has good biocompatibility.

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Dioxin-like compounds are a class of persistent organic pollutants(POPs).Because of their high toxicity, stability and bioaccumulation, they have serious effects on human health and environment.Studies on the toxicity of dioxins have involved in many aspects, such as reproduction toxicity, immune toxicity, carcinogenicity, endocrine toxicity, and so on.However, few studies of the effects on intelligence had been done,and its potential mechanism had not been reported till now.In this review, the authors tried to generalize the relationship between dioxins and intelligence based on animal behavioral tests and population investigations and hypothesize its potential mechanisms.

This paper introduces a kind of tele-acquisition system for temperature and humidity data based on the technology of power line carrier,and presents its hardware interface and software design.With the application of the spread spectrum carrier and the power line communication,this system has such advantages as reliable transmission,low cost and high practicality.

The adductor spasticity is a common symptom in children with cerebral palsy. The ultramicrostructure damages have been found in adductor. If the spasticity is not treated in time, there will be some secondary injury, such as hip joint dislocation, muscle tendon crispation, contracture of joint, hip pain, and so on. The treatment for adductor spasticity includes stretching, orthosis, training device, selective posterior rhizotomy, neurotomy of anterior branch of obturator nerve, Adductor myotomy, phenol block, Botulinum Toxin injection, Intrathecal baclofen etc. Every method has its own advantage and disadvantage.

Objective To investigate the concentration of monocyte chemoattractant protein-1 (MCP-1) and interleukin-18 (IL-18) in the urinary of children with primary nephrotic syndrome(PNS) at different time points,and to explore their correlation with occurrence,development,progression,and prognosis of PNS.Methods A total of 65 pediatric cases from our hospital was enrolled in this study,and was divided into three groups based on the retrospective the follow-up results including steroid-sensitive NS (SSNS) (n =35),steroid-resistant NS (SRNS) (n =15),and frequent-relapse NS (FRNS) (n =15) groups.Another 20 healthy children served as normal controls.Peripheral blood samples and urine specimen were collected at three time points (without glucocorticoids,treatment after 8 weeks,and treatment after 16 weeks or recurrence).The levels of MCP-1 and IL-18 in the urine were assayed by enzyme-linked immunosorbent assay (ELISA).The levels of blood urea nitrogen,creatinine,and 24-hour urinary protein excretion were assayed by full-automatic biochemical study appliance.Results (1)In SSNS group,the levels of urinary IL-18 before treatment and treated for 8 weeks were higher than the normal control group [before treatment:(160.30 ±27.29) pg/ml; treated for 8 weeks:(157.62 ±26.85) pg/ml; normal control group:(70.88 ± 14.43) pg/ul].However,after treated for 16 weeks,the levels of urinary MCP-1 and IL-18 were markedly decreased compared with that of control group and those before treatment and treated for 8 weeks [treated for 16 weeks:(20.98 ±4.53) pg/ml,and (79.09 ±7.23) pg/ml,P ＜0.05].(2)In SRNS group,the levels of urinary MCP-1 and IL-18 before treatment were remarkably higher than that of control group and that of SSNS group before treatment[SSNS group before treatment:(76.84 ± 5.58) pg/ml,and (252.37 ± 25.34)pg/ml,P ＜0.05],but no significant difference was found when it was compared with that treated for 8 weeks [treated for 8 weeks:(72.32 ±4.30) pg/ml,and (243.70 ±35.43) pg/ml,P ＞0.05] ; However,its level was markedly decreased after treated with immunosuppressants of CTX for 16 weeks when it was compared with those before treatment and treated for 8 weeks[treated for 16 weeks:(34.03 ± 2.56) pg/ ml,and (114.42 ± 21.33)pg/ml,P ＜ 0.05].(3)In FRNS group,the levels of urinary MCP-1 and IL-18 were no remarkable difference between control and SSNS groups [before treatment:(30.43 ± 4.61) pg/ml,and (156.65 ± 34.39)pg/ml; treated for 8 weeks:(29.41 ± 4.76) pg/ml,and (152.21 ± 34.73) pg/ml,P ＞ 0.05],but its level was markedly lower than SRNS group (P ＜ 0.05).When it was recurred,the levels of urinary MCP-1 and IL-18 were significantly increased compared with before treatment and treated for 8 weeks[recurred:(72.92 ±3.01)pg/ml,and (224.33 ±26.07)pg/ml,P ＜0.05].(4)No correlation was found between the levels of MCP-1 and IL-18 and the levels of blood urea nitrogen and creatinine (P ＞0.05).Positive correlation was found between the levels of MCP-1 and IL-18 and the 24-hour urinary protein excretion (r =0.706,0.556,P ＜0.01).There's a correlation between urinary MCP-1 and IL-18 (r =0.811,P ＜ 0.01).Conclusions For children with PNS,the detection of urinary MCP-1 and IL-1 8 contributed to the early prediction of children'sensitivity on glucocorticoid.The elevated levels of urinary MCP-1 and IL-18 in combination with clinical symptoms and proteinuria can be used as an important noninvasive marker to monitor PNS recurrence.

Objective To study DNA damage induced by chlorinated drinking water by-product MX.Methods Hu-man hepatocellular carcinoma cell line HepG2cells was selected as target cells to test the DNA damage induced by MX using single cell gel electrophoresis assay.In this study,the cells were treated with MX at final concentrations of10,30,100and300?mol/L.DMSO and hydrogen peroxide were administered as solvent control and positive control respectively.Results MX induced DNA single strand breaks at the concentrations of30,100and300?mol/L.The length of DNA migration induced by MX increased significantly in comparison with the solvent control(DMSO)in a dose-response manner.Conclusions Chlorinated by-product MX in drinking water could induce obvious DNA damage to human hepatocellular carcinoma cell line HepG2cells.

Objective To examine whether the prenatal hypoxia adaptation has any protective effect on the brain of the newborn rat Methods 12 22 day pregnant Wistar rats were randomly divided into 2 groups: the control group and the treated group In the treated group the pregnant rats were placed in a tightly closed hypoxia adaptation chamber When the O 2% in the chamber dropped to 15%, the rat was taken out to breathe fresh air for 5 min then put back in the chamber This process was repeated until its natural delivery In control the chamber was not tightly closed (O 2%=21%) 40 newborn rats weighing 6 8g were selected and subjected to brain ischemia and hypoxia, Left common carotid artrey was ligated under ether anesthesia 2h after recovery from surgery the newborn rats were placed in hypoxia chamber (T=36℃?1℃,O 2%=9%)for 1 5h 24h later they were sacrificed and brain was removed for microscopic examination (optical and electron) and flow cytometry measurement Results In the treated group most newborns were normal There were a few apoptosis cells in early stage The rate of apoptosis was 2 9%, necrosis cells could hardly be seen In the control group, although most neurons were also normal but there were apoptosis cells in early, middle and late stage and even necrosis cells The rate of apoptosis was 9 51%, which was significantly different from that in the treated group Conclusions Prenatal hypoxia adaptation has protective effect on the brain of newborn rat