全固态炎痛静电极与底液介电常数对电极性能的影响

全固态结构的杂多酸型炎痛静电极具有良好的电极性能,线性响应范围下限可达1.5×10^-6mol/L,可用于生物体液及微体积中微克量级炎痛静的测定。发现;在不同介电常数的乙醇—水混合底液中,杂多酸型(磷钨酸、硅钨酸)电极的响应性能与二环己基萘磺酸、二苦胺、四苯硼、四碘合铋酸或苦味酸型电极不同,并不因底液介电常数之降低而显著改变其斜率。     

（Sp）－8－氯腺苷－3＇，5＇－环磷酸辛酯对人白血病HL－60细胞的诱导分化作用

（Ｓｐ）－８－氯腺苷－３＇，５＇－环磷酸辛酯（Ｓｐ－ｏｃｔｙｌ８－ｃｈｌｏｒｏａｄｅｎｏｓｉｎｅ３＇，５＇－ｃｙｃｌｏｐｈｏｓｐｈａｔｅ，ＯＣＣ）对人白血病ＨＬ－６０细胞有生长抑制和分化诱导作用，该作用与ＯＣＣ浓度和处理时间呈正相关，为不可逆性。流式细胞光度术发现，ＯＣＣ阻断ＨＬ－６０细胞周期于Ｇ１期。参入实验证实，ＯＣＣ对ＨＬ－６０细胞ＤＮＡ合成有显著抑制作用，但不影响ＲＮＡ和蛋白质合成。ＯＣＣ能直接激活ＨＬ－６０细胞浆中提取的蛋白激酶Ａ（ＰＫＡ），并抑制它与ｃＡＭＰ的结合。经ＯＣＣ处理的ＨＬ－６０细胞浆中ＰＫＡ活性明显升高，说明ＯＣＣ能与ｃＡＭＰ竞争ＰＫＡ的结合并激活ＰＫＡ。     

Cardiopulmonary exercise testing as a predictor of complications in oesophagogastric cancer surgery

Introduction

An anaerobic threshold (AT) of <11ml/min/kg can identify patients at high risk of cardiopulmonary complications after major surgery. The aim of this study was to assess the value of cardiopulmonary exercise testing (CPET) in predicting cardiopulmonary complications in high risk patients undergoing oesophagogastric cancer resection.

Methods

Between March 2008 and October 2010, 108 patients (83 men, 25 women) with a median age of 66 years (range: 38–84 years) underwent CPET before potentially curative resections for oesophagogastric cancers. Measured CPET variables included AT and maximum oxygen uptake at peak exercise (VO₂ peak). Outcome measures were length of high dependency unit stay, length of hospital stay, unplanned intensive care unit (ICU) admission, and postoperative morbidity and mortality.

Results

The mean AT and VO₂ peak were 10.8ml/min/kg (standard deviation [SD]: 2.8ml/min/kg, range: 4.6–19.3ml/min/kg) and 15.2ml/min/kg (SD: 5.3ml/min/kg, range: 5.4–33.3ml/min/kg) respectively; 57 patients (55%) had an AT of <11ml/min/ kg and 26 (12%) had an AT of <9ml/min/kg. Postoperative complications occurred in 57 patients (29 cardiopulmonary [28%] and 28 non-cardiopulmonary [27%]). Four patients (4%) died in hospital and 21 (20%) required an unplanned ICU admission. Cardiopulmonary complications occurred in 42% of patients with an AT of <9ml/min/kg compared with 29% of patients with an AT of ≥9ml/min/kg but <11ml/min/kg and 20% of patients with an AT of ≥11ml/min/kg (p=0.04). There was a trend that those with an AT of <11ml/min/kg and a low VO₂ peak had a higher rate of unplanned ICU admission.

Conclusions

This study has shown a correlation between AT and the development of cardiopulmonary complications although the discriminatory ability was low.     

Novel PLA/Chitosan Composite Materials Prepared by SCF-CO2 Technique

Because of the incomparable merits （nontoxicity, non-remainder, fast transfer mass） of supercritical carbon dioxide fluid technique（SC-CO2）, it was used to developed a series of novel biodegradable tissue engineering scaffold materials in this research. The novel PLA/chitosan composite materials could be molded to different shapes, and the porosity of the materials were over 200 lam and connected. Chondrocyte cultivation, subcutaneous and intramuscular implantation were mainly discussed this paper. The results showed that the cells could well adhere, grow and multiplicate on the surface of the materials, which indicated good biocompatibility of the composite materials. The plantation test revealed that the PLA materials had already dismissed 2 month late in the body, while the composite materials could still keep certain strength and shape, and the most important things is the response of the tissue toward the implanted PLA/chitosan composite materials was mild and had far less inflammation than PLA materials. 8 to 16 weeks later, fiber membrane was stable; degradation of the materials was seen clear and tissue had already spread into it.