海藻酸钠固定化菌株JY04降解苯酚特性研究

以苯酚作为唯一碳源和能源的无机盐培养液对从绝缘材料厂排放的活性污泥进行驯化,从中分离筛选到1株苯酚降解菌,编号为JY04.采用正交实验设计方法优化了该菌株固定化条件,并且考察了该固定化细胞降解苯酚的最适条件.结果表明:在固定化条件为海藻酸钠(SA)浓度为5%,湿菌重/包埋剂为6/30,CaCl2浓度为3%时,固定化时间为8 h,降解率可达82.6%,并具有较好的机械强度.确定其对苯酚降解最适条件为pH 7.0,苯酚浓度为400 mg/L,温度32℃,接种量为25 g,培养时间42 h,其苯酚的降解率可达97.3%.该菌株固定化细胞的降解苯酚能力和耐受苯酚能力均大于游离细胞.固定化菌株对苯酚有较强的降解和耐受能力,是处理苯酚废水的良好菌种资源.     

食品中甲醛次硫酸氢钠分析方法的研究与探索

对药品辅料中甲醛次硫酸氢钠的检测方法进行改进,以增大方法的提高灵敏度、稳定性。方法:参照国标GB/T21126-2007,采用Wateres2695高效液相色谱仪对食品中甲醛次硫酸氢钠进行测定。结果:高效液相色谱仪测定甲醛次硫酸氢钠的测定平行进样RSD小于2%,标准曲线时相关系数能达到0.999以上,平均回收率为94.8%,最低检出限为0.02μg/mL。对不同种类食品的前处理方法、液相色谱的条件标准曲线的制备进行了改进,并取得了一定的成效。结论:改进后测定甲醛次硫酸氢钠的方法精密度高、准确度好、完全能满足食品中甲醛次硫酸氢钠的定性定量分析。     

钠钙交换体对心肌保护作用的研究进展

心肌钠钙交换体是引起胞内钙超载的重要原因.简要综述了钠钙交换体的的结构特征、生理功能、病理作用以及在心肌保护方面的研究新进展.NCX反向转运的激活可能是心肌缺血预适应产生心脏保护作用的机制之一.     

Hypertonic saline resuscitation maintains a more balanced profile of T-lymphocyte subpopulations in a rat model of hemorrhagic shock

Objective： To investigate the potential and early effect of hypertonic saline resuscitation on T-lymphocyte subpopulations in rats with hemorrhagic shock. Methods： A model of rat with severe hemorrhagic shock was established in 18 Sprague-Dawley （SD） rats. The rats were randomly divided into Sham group, HTS group （hypertonic saline resuscitation group） and NS group （normal saline resuscitation group）. Each group contained 6 rats. The CD4~ and CD8~ subpopulations of T-lymphocytes in peripheral blood were detected respectively before shock and after resuscitation by double antibody labelling and flow cytometry. Results： In the early stage after hemorrhagic shock, fluid resuscitation and emergency treatment, the CD4^＋ lymphocytes of peripheral blood in HTS and NS groups markedly increased. Small volume resuscitation with HTS also induced peripheral CD8^＋ lymphocytes to a certain extent, whereas NS resuscitation showed no effect in this respect. Consequently, compared with Sham and HTS groups, CD4^＋/CD8^＋ ratio of peripheral blood in NS group was obviously increased, and showed statistically differences. Conclusion： In this model of rat with severe hemorrhagic shock, small volume resuscitation with HTS is more effective than NS in reducing immunologic disorders and promoting a more balanced profile of T-lymphocyte subpopulations regulating network.     

二乙基氨荒酸钠缓蚀剂的合成研究

在碱性条件下,以二乙胺、二硫化碳为原料合成二乙基氨荒酸钠缓蚀剂.分别研究了反应物摩尔比、反应温度、缓蚀剂浓度、介质环境等对缓蚀效果的影响.结果表明：当二乙胺与二硫化碳摩尔比为0.7：1,氢氧化钠浓度30%,反应温度为5℃-10℃,二乙基氨荒酸钠产率为90.98%,用作缓蚀剂浓度为0.04mol·L-1时,在酸性介质中的缓蚀效率最佳,可达到98.28%,腐蚀速率0.0016g/（h·y）.该合成二乙基氨荒酸钠缓蚀剂方法简单,得到的缓蚀剂效果好.     

煤泥絮团分散剂的应用研究

分别采用六偏磷酸钠、羧甲基纤维素钠(CMC)作为分散剂,对夹河煤、开滦煤进行分散试验,以自制水煤浆体系黏度大小为表征方法,验证其分散效果;并经由浮选实验结果验证分散处理之后的煤泥浮选效果。结果表明,两种分散剂均使各分散体系的黏度值有所增加,达到了分散煤泥絮团的目的。经六偏磷酸钠分散后,夹河煤和开滦煤的精煤灰分及回收率,在一定范围内均有所提高,但是规律性不强;CMC分散性很好,但因其与捕收剂之间具有排斥作用,难以浮选出精煤,不可用于煤泥浮选浆体分散。     

离心力场对氯酸钠不对称结晶的影响

研究了外在的离心力场对氯酸钠溶液结晶的影响,使用偏光显微镜考察了离心机的不同转速下,氯酸钠结晶过程中手性对称性破缺的统计结果.实验表明,作为一个物理因素,外在的离心力场能明显诱导氯酸钠溶液结晶的手性分布.当离心机转速较大时(如6000r/min),饱和溶液的结晶趋向于仅有一种构型——L型或D型,即能导致氯酸钠结晶的完全手性对称性破缺,且顺时针离心力场中D型晶体数量明显大于L型,而在逆时针离心力场中L型晶体数量却明显大于D型,并均随外力增大而效应增大.这些结果表明,外在离心力场可方向性地对氯酸钠溶液的不对称结晶过程产生重要影响.     

HPLC法测定注射用泮托拉唑钠的含量

目的:建立HPLC法测定注射用泮托拉唑钠含量的方法。方法:以乙腈-磷酸盐缓冲液(取磷酸氢二钠1.12g与磷酸二氢钠0.18g,加水溶解并稀释至1000ml,调节PH至7)(30:70)为流动相,检测波长为289nm;柱温:室温。结果:泮托拉唑钠在13μg/ml～208μg/ml浓度范围内,呈良好的线性关系(r=0.99999),平均回收率为100.24%,RSD=0.6%(n=9)。结论:方法简便、可靠、快速、可用于注射用泮托拉唑钠生产的质量控制。     

Antimutagenic potential of curcumin on chromosomal aberrations in Allium cepa

Turmeric has long been used as a spice and food colouring agent in Asia. In the present investigation, the antimutagenic potential of curcumin was evaluated in Allium cepa root meristem cells. So far there is no report on the biological properties of curcumin in plant test systems. The root tip cells were treated with sodium azide at 200 and 300 μg/ml for 3 h and curcumin was given at 5, 10 and 20 μg/ml for 16 h, prior to sodium azide treatment. The tips were squashed after colchicine treatment and the cells were analyzed for chromosome aberration and mitotic index. Curcumin induces chromosomal aberration in Allium cepa root tip cells in an insignificant manner, when compared with untreated control. Sodium azide alone induces chromosomal aberrations significantly with increasing concentrations. The total number of aberrations was significantly reduced in root tip cells pretreated with curcumin. The study reveals that curcumin has antimutagenic potential against sodium azide induced chromosomal aberrations in Allium cepa root meristem cells. In addition, it showed mild cytotoxicity by reducing the percentage of mitotic index in all curcumin treated groups, but the mechanism of action remains unknown. The antimutagenic potential of curcumin is effective at 5 μg/ml in Allium cepa root meristem cells.     

Rheological behaviors of Graphitic oxide/Sodium alginate dispersions

One kind of the carbonaceous materials with high performance was chosen to prepare dispersions of GO/SA. The influence of GO contents on rheological properties of SA solution was studied with rotationa...