Effects of microfiltration membrane adsorption for eight types of pesticides with diverse physicochemical properties on direct injection liquid chromatography-tandem mass spectrometric method ( DI-LC-MS/MS) were investigated. The results showed that the adsorption effects ( AE,%) on the loss of signal detection at concentration of 2. 5 μg/L ranged from 8%-92%, 0%-81% and 2%-59% for nylon (NYL), polyethersulfone ( PES) and hydrophilic polypropylene ( GHP) membrane, respectively ( accumulated volume of feed is 1 mL). The pesticides with higher octanol-water partition coefficient (lgKow) values appeared to adsorb onto the membrane surface more readily than those with lower lgKow. The AE was found to be alleviated as the feed volume of samples increased to 10 mL, except the case of profenofos adsorption on PES membrane ( AE=9%) . The effects of PES membrane on the eight pesticides at initial individual concentration of 0 . 25 , 2. 5 and 25 μg/L were also studied. The results showed that, the lower the initial concentration of pesticides, the stronger adsorption effect under the same filtration conditions was obtained. Besides, it was effective in eliminating the membrane adsorption effects by adding 40% methanol ( V/V) into water samples as a modifier, which could consequently improve the accuracy of DI-LC-MS/MS.

AIM: To study the inhibitive effects of valsartan and spironolactone on expression of insulin like growth factor 1 in cardiacmyocytes of spontaneously hypertensive rats. METHODS: 18 SHRs were randomly divided into 3 groups (n=6 in each): valsartan group treated with 30 mg?kg -1 ?d -1 valsartan, spironolactone group treated with 20 mg?kg -1 ?d -1 spironolactone, and control group treated with placebo. All were administrated by gastric perfusion. 6 WKY rats were served as control. After 13 weeks administration, the expressions of IGF 1 in cardiacmycytes were measured by immunohistochemistry and the IGF 1 concentrations in myocardium were measured by radiommunoassay. RESULTS: The expression of IGF 1 was higher in SHR group than that in the WKY group (P

Ex-vivo liver resection and liver autotransplantation offers a chance to cure extensive regional liver diseases which are otherwise deemed untreatable in selected cases. A 33-year-old male patient with advanced alveolar echinococcosis (AE) which invaded the right lobes and adjacent retrohepatic inferior vena cava, while the left lobes were free from lesion and had proliferated to over 1200 ml in size except for a 1 cm × 1 cm solid lesion in the segment Ⅳ. No extrahepatic metastases were found in this patient. A lesion with a size of 4300 ml and other small lesions in the right lobes were removed extracorporeally,and the retrohepatic vena cava was repaired, then the remaining AE-free left lobes (more than 700 ml in size) and the retrohepatic inferior vena cava were re-implanted in situ. A temporary end-to-end cavo-caval shunt with interposition of a blood vessel prosthesis and end-to-side portocaval shunt were established to keep the blood flow during the four-hour anhepatic phase. The patient was followed up for six months, and he had no signs of residual liver disease with good hepatic function.

Objective:To measure the displacement of the solitary pulmonary lesion (SPL) located in different pulmonary segments based on 4D-CT technology (4DCT) and to establish and verify a relevant mathematical model of tumor displacement.Methods:The modeling samples of 290 SPLs were subject to both 4DCT and active breath control (ABC) spiral CT scans. The tumor displacement in different pulmonary segments was measured based on 4DCT images. The tumor volume was obtained by contouring the gross tumor volume (GTV) on ABC spiral CT images. The diaphragm movement was measured by X-ray simulator. The vital capacity and tidal volume were gained by pneumatometer. The baseline data, such as gender, age, height, weight, respiratory rate, and tumor lobe and segment where tumors were located, were collected. Multivariate linear regression was used to analyze the correlation between the 3D-tumor displacement and gender, age, height, weight, respiratory rate, tumor location, volume and diaphragm movement. The displacement model was established based on the modeling sample of 290 cases. Then, it was verified by comparing the tumor displacement derived from the model with that of 4DCT technology based on the randomly selected 17 SPLs.Results:The displacement model for tumors located in the upper lobe was established as Xup=-0.267+0.002TV+0.446DM, Yup=-1.704+0.004TV+0.725DM+2.250SII+1.349SIII and Zup=0.043+0.626DM+0.599SII+0.519SIII. The displacement model of the middle lobe tumors was Xmid=0.539+0.758DM, Ymid=-2.316+2.707DM+0.009TV and Zmid=0.717+1.112DM. The displacement model for tumors located in the lower lobe was Xlow=-0.425+0.004TV+0.857DM, Ylow=4.691+4.817DM+0.005TV-0.307RR+3.148SIX+2.655SX and Zlow=0.177+0.003TV+0.908DM.(DM: diaphragm movement, TV: tidal volume, RR: respiratory rate, SII: posterior segment, SIII: anterior segment, SIX: lateral basal segment, SX: posterior basal segment). There was no significant difference between two results derived from the displacement model and 4DCT technology.( P>0.05). Conclusions:The diaphragm movement and tidal volume are the main influencing factors of 3D lung tumor displacement. The tumor displacement in the superior-inferior direction is correlated with different pulmonary segments of the upper and lower lobes. The displacement of tumors located in different segments of middle lobes is similar. The displacement model can predict the displacement of SPLs located in different lobes, providing reference for individualized delineation of PTV.