Objective To investigate the relationship between air pollutant exposure and preterm delivery (PTD) by Logistic regression model, as the effect of air pollutant exposure to PTD made great concern today. Methods The present study consisted of 31 145 qualified birth cases, 80.09% of the total amount, from 1 Nov, 2005 to 1 Aug, 2007. The covariant items included maternal age, nation, education, residence, income, occupation, occupation exposure, parent-drinking, father-smoking, heating-type, folic acid supplement, season of pregnancy, prenatal health care, etc. The Logistic regression analysis was employed to control the confounding factors mentioned above, then the pollutant was introduced step by step to build the single, double and triple pollutant Logistic regression model to examine the association between three pollutants (SO2, NO2, and PM10) and PTD during the first and third trimesters of pregnancy. The air monitoring data (daily average of SO2, NO2, and PM10) were collected from Taiyuan Environmental Monitoring Station. Results In the first trimester, a quartile increase of NO2 exposure caused the risk for PTD increased by 22.7%. As for the effect of PM10, no significant differences were seen. In the third trimester, a quartile increase of NO2 exposure caused the risk for PTD increased by 19.1%. Conclusion The NO2 exposure during the pregnancy can increase the risk of PTD. The susceptible exposure-window choice is critical for the further study in this field.

Objective To investigate the expression of neurotrophins receptor 75NTR in human breast cancer resistant cell line and its correlation with multidrug resistance. Methods Western blot was used to detect the expression level of p75NTR protein in various breast cancer cell lines and multidrug resistant cell lines. The over-expression vector and siRNA vector of p75NTR were constructed by gene recombination method. Western blot was used to detect the expression levels of p75NTR protein in transfected p75NTR and p75NTR - siRNA breast cancer resistant cell line MDA-MB-231/ADR;the sensitivity of MDA-MB-231 and MDA-MB-231/ADR to different chemotherapeutic anticancer drug (PTX ,ADM ,GEM ,DDP ,OXA) and the multi-drug resistance effects in over-expression and knock-down p75NTR MDA-MB-231/ADR were detected by CCK-8 assay. Results Western blot result showed that the expressions of p75NTR protein in the multidrug-resistant breast cancer cell lines MDA-MB-231/ADR and MCF-7/5-FU were higher than that of other breast cancer cell lines. Over-expression of p75NTRcan up-regulate the expression of p75NTR protein in MDA-MB-231/ADR;the CCK-8 assay indicated that over-expression of p75NTR can effectively enhance the resistance of MDA-MB-231/ADR cells to ADM,GEM and OXA. Conclusion The expression of p75NTR in breast cancer resistant cell line is higher than that of its parental cell line;over-expression of p75NTR can reduce the sensitivity to chemotherapeutic drugs and promote its multidrug resistance.

Object To optimize the conditions for the extraction of Panax notoginseng (Burk ) F H Chen Methods Conditions for the extraction were studied by orthogonal experimental design as guided by the content of total notoginseng saponin present in the extract Results Significant effect was observed in 3 different experimental conditions Conclusion The optimum condition for the extraction of P notoginseng was to soak the drug in 75% alcohol for 24 h and then percolate at a rate of 1~3 ml/min to collect an amount corresponding to about 10 times of the quantity of P notoginseng

Object To develop a method for the determination of polysaccharide in TIANCI CAPSULE, which is a new drug dosage form containing the bouillon of fresh water mussels with immunopotentiating activity Methods Total polysaccharide was determined by phenol sulfuric acid method with glucose as the standard, and spectrophotometer assay absorbency at 490 nm Results The linear range of polysaccharide was 10～80 ?g/mL, r=0 999 7 The average recovery rate was 98 67% (n=5), RSD=2 58% Through sample assay, the content of polysaccharide was 267 7～300 6 mg in each TIANCI CAPSULE Conclusion The method is simple, rapid and reliable, and may be used for the quality control of this preparation

Object To investigate the chemical constituents of Securidaca inappendiculata Hassk Methods Compounds of 95% alcohol extract from the stem of S inappendiculata were isolated by column chromatography and Medium Pressure Liquid Chromatography, respectively The structures of the compounds were elucidated by chemical and spectral (UV, IR, MS, 1HNMR adn 13 CNMR) analyses Results Six compounds were isolated and identified as: 4, 4′ dimethyl 1, 7 heptanedioic acid (Ⅰ), inositol (Ⅱ), stigmasterol (Ⅲ), vittadinoside (Ⅳ), rhamnose (Ⅴ), sucrose (Ⅵ) Conclusion For the first time, compound Ⅰ was obtained from the plant and other compounds were isolated from Securidaca Mill

Objective To investigate the mechanism of brain injury caused by thrombin and the intervention effect of hirudin and nimodipine.Methods Different doses of thrombin or/and hirudin were injected into nucleus caudatus of SD rats,nimodipine was given intraperitoneally.Dry-wet-weighing technique,immunohistochemical method and TUNEL were used to examine brain edema,the changes of cytoskeleton,neuron apoptosis and histological changes.Results(1) High dose of thrombin resulted in severe cerebral edema as early as 4 h after injection and the maximum edema occurred at 24~48 h.The edema gradually decreased and got close to normal within 3~7 d.Cytoskeleton changes were observed at early stage(4h),reversible or irreversible injuries presented at 24~48 h,and neuron necrosis occurred within 3~7 d.Neuron apoptosis started at 4h and peaked at 24~48 h.In contrast,low dose of thrombin and normal saline did not show these effects.(2) The effects of thrombin could be inhibited by hirudin and nimodipine(a calcium-ion antagonist) could relieve or delay cell injury.Conclusions High dose of thrombin may result in severe brain edema,neuron irreversible injury and apoptosis,which all peak at 24~48 h.Early treatments could greatly reduce brain damage and improve prognosis of intracerebral hemorrhage.

AIM: To establish HPLC fingerprint of Ramulus cinnamomi.This fingerprint was expected to be standards of quality control and identification of the Chinese crude drug. METHODS: The HPLC method was used,chromatography condition were Kromasil C_(18)(250 mm?4.6 mm,5?m) column with gradual mobile phase of acetonitrile-0.5% acetic acid,UV detection wavelength at 280 nm and column temperature at 25(?C) with the flow rate of 1 ml?min~(-1). RESULTS: The retention time of Cinnamaldehyder,Cinnamic acid,o-Methoxycinnamic acid and Coumarin in Ramulus cinnamomi were determined.The fingerprint showed high similitude in samples from different regions. CONCLUSION: The HPLC fingerprint of Ramulus cinnamomi.can be used as a standard of quality control and identification of the Chinese crude drug.

This paper is to report our study in which the differences between prosthetic restoration and surgical reconstruction using traditional clasp retention technology were analyzed based on three-dimensional finite element methods in our laboratory. Firstly, the maxillary unilateral defect model was developed using medical image processing software MIMICS. Secondly, the prosthesis was generated by mirroring technology. The clasp was designed according to the methods raised by Aramany. Then, the stress distribution of maxilla was calculated by simulating occlusion. According to the results, after osseointegration of surgical reconstruction, stresses of unaffected abutments were reduced significantly, and less stress of junction occurred near zygoma of affected side, which were all less than stresses of prosthesis restoration. Thus, removing the clasp of surgical reconstruction increased the stresses of unaffected abutments. The stress trends of maxillary components were different between prosthetic restoration and surgical reconstruction. Surgical reconstruction is better than prosthesis restoration in protection of the abutments. Clasp can alleviate the occlusal burden of maxilla. Varieties of retentive technologies can be considered in prosthesis restoration. The surgical reconstruction is more conducive to rehabilitate unilateral maxilla biomechanically in clinic.
Biomechanical Phenomena ; Finite Element Analysis ; Humans ; Image Processing, Computer-Assisted ; Mandibular Reconstruction ; methods ; Maxilla ; surgery ; Maxillofacial Prosthesis ; Osseointegration ; Zygoma