OBJECTIVE:To establish an LC-MS method for the determination of the ritodrine content in human plasma.METHODS:The determination was performed on Agilent Eclipse Plus C18 column with the column temperature kept at 40 ℃.The mobile phase consisted of methanol-water(95∶5,containing 0.02 mol?L-1 ammonium formate)with a flow rate of 0.5 mL?min-1.The extraction agent was acetic ether-dichloromethane(4∶1).A triple quad mass spectrometer system equipped with an electro spray ionization ion-trap source was used as the detector and operated in the positive ion model.Selected reaction monitoring(SRM)was employed to detect ritodrine(m/z 288.2→121.1)and the internal standard dobutamine(m/z 302.1→107.0).RESULTS:The linear range of ritodrine was 0.25～100 ng?mL-1(r=0.999 1),with the lower limit of quantification at 0.25 ng?mL-1.Both the intra-day RSD and inter-day RSD were less than 15%.The methodological recovery was 98.00%～103.44%.CONCLUSION:The method is sensitive,accurate,reproducible,specific and suitable for the pharmaceutical study of ritodrine.

Atlanto-axial complex is the most important functional unit of the cervical spine.Atlanto-axial instability or dislocation,one of the most serious pathologies in spinal surgery,is often managed by posterior atlantoaxial fixation and fusion.Several posterior fixation techniques have been used to stabilize the atlanto-axial complex,including wire/cable-bone fixation,Halifax clamps,transarticular screw fixation,screw-plate fixation and screw-rod fixation.For atlanto-axial dislocation that cannot be reduced with skull traction before operation,intraoperative reduction is often needed.Current intraoperative reduction techniques can be classified into transoropharyngeal surgical release followed by posterior reduction and fixation,transoropharyngeal reduction and fixation,and posterior reduction and fixation using screw-rod system according to approaches.Furthermore,posterior reduction can be performed using elevating-pull,leverages,and cantilever techniques.This study reviews the intraoperative reduction and fixation techniques mentioned above.

Electromagnetic Fields ; Environmental Exposure ; Humans ; Radiation Dosage ; Threshold Limit Values

The C3 cleavages of human blood kept at different temperatures in vitro were studied. In 14 autopsy cases, the postmortem intervals(PMI) were estimated based on the C3 cleavage rates and the rectal temperatures. The 95% confidence of predicting PMI was?11 hours. The phenotyping of C3 could be achieved while the C3 cleavage rate was measured. It is suggested that it is useful for the personal identification of unknown corpses.

Objective: To develop a novel method using high-performance capillary electrophoresis coupled with DAD (HPCE-DAD) for the simultaneous determination of 10 phenolic compounds (luteolin-7-O-glucoside, rutin, quercetin-3-glucoside, quercetin-3- rhamnoside, salicylic acid, luteolin, kaemferol, quercetin, gallic acid, and protocatechuic acid) in Bidens bipinnata. The extraction efficiency of above mentioned compounds was compared using six different ethanol/water solutions. Methods: The effects of pH value and concentration of buffer, applied voltage, and temperature on the separation were researched. The 10 compounds were baseline separated within 16 min in a 60 cm length capillary at a separation voltage of 25 kV with a running buffer consisting of 25 mmol/L borate (pH 9.5) at wavelength of 214 nm. Results: Excellent linearities of luteolin-7-O-glucoside, rutin, quercetin-3-glucoside, quercetin-3-rhamnoside, salicylic acid, luteolin, kaemferol, quercetin, gallic acid, and protocatechuic acid were observed at 5.0-120, 5.0-120, 5.0-120, 5.0-120, 1.0-120, 2.5-120, 5.0-120, 2.5-120, 2.5-120, and 2.5-120 mg/L, respectively. The detection limits were at 2.5, 2.5, 2.5, 2.5, 0.5, 1.0, 2.5, 1.0, 1.0, and 1.0 mg/L, respectively. The relative standard deviations (RSD) of precision were below 5.17% (n = 6). The mean recoveries for 10 phenolic compounds in B. bipinnata ranged from 94.4% to 105.8%, with RSD values of 0.32%-4.33%. Conclusion: The contents of luteolin-7-O-glucoside, rutin, quercetin-3- glucoside, quercetin-3-rhamnoside, salicylic acid, luteolin, kaemferol, quercetin, gallic acid, and protocatechuic acid in B. bipinnata are 95.04-105.84, 78.03-110.45, 96.45-177.96, 178.78-300.00, 62.06-66.54, 71.08-72.85, 77.39-95.30, 68.27-77.43, 68.47- 88.47, and 107.24-142.43 μg/g, respectively.

[Objective]To explore the clinical effect of cervical spondylotic radiculopathy treated with intervertebral foramen block and brachial plexus traction-like technique.[Methods]54 cases of cervical spondylotic radiculopathy were randomly divided into two groups,i.e.control group(cervical traction and brachial plexus traction-like technique) and treatment group(added with intervertebral foramen block).[Results]The cure rate and effective rate were 66.67% and 92.59% in treatment group,and 25.93% and 78.78% in control group,respectively.Clincal efficacy is significantly better in treatment group than that in control one(P

With the development of drug discovery, more and more candidate compounds need to be studied. Methods that can screen compound rapidly received significant attention. Parallel artificial membrane permeability assay (PAMPA) as a powerful tool has been applied to drug studies. It uses an artificial lipid membrane to mimic the barrier for drug permeability studies. This article introduces the establishment and characteristics of PAMPA, as well as its applications in screening compounds. It can be used as models (e.g. predicting the ability of compound in gastro-intestinal absorption, blood-brain barrier transportation and skin penetration) by changing the component of artificial lipid membrane. PAMPA has advantages in high throughput selection of valuable compound with low cost, versatile, low dose, and good reproducibility.

The training of clinical thinking ability is the key point of obstetrical teaching to medical students in eight-year program.Obstetrical department of the third affiliated hospital of Sun Yat-sen university has put forward specific methods of SP inquiring and PBL case analysis teaching.The well-designed teaching methods have an active role in the training of case history collecting ability,diagnosing and treating ability to medical students in eight-year program.

Exchange maintenance methods of Hitachi electron microscope H-600 faults, master the workflow of vacuum system, and improve maintenance level together. Analyzed some cases of troubleshooting to Hitachi electron microscope H-600, collected troubleshooting skills, and gives related solutions.

Objective To investgate the expression and the clinical significance of survivin in the primary hepatocellular carcinoma (HCC). Methods S-P immunohistochemical staining was performed to detect the expression of survivin in 50 samples of HCC tissue and 20 of normal liver tissue. Results The positive rate of survivin expression in HCC was 66. 0% (33/50) , which was significantly higher than that in normol liver tissues (negative expression) (P<0. 001). The expression of survivin was correlated with intrahepatic dissemination and multiple masses (P = 0. 019, P=0. 030). The high survivin expression was associated with the survival time less than three years(P = 0. 018). Conclusion The survivin may play certain roles in the oncogenesis and progression of HCC. Detection of the survivin can supply certain evidence on prognosis of primary hepatocellular carcinoma.