对HP绘图仪P3笔的改进

HEWLETT-PACKARD绘图仪的P3绘图笔，笔芯材质软，易磨损变粗、变干，尤其是对密集型峰图谱的描绘不尽人意。改进后的笔经实践证明不仅耐用性好，绘图效果也很好，使密集型峰清晰可辩．     

硒卡拉胶囊对幽门螺杆菌相关性胃炎的治疗

对152例幽门螺杆菌慢性胃炎病人采用常规抗生素治疗和抗生素加硒卡拉胶囊治疗。结果表明，硒卡拉胶囊和常规抗生素均能改善慢性胃炎病人反酸、胃胀、嗳气等症状，两者合用则效果更好，胃炎病人症状好转率和HP清除率均显著优于单用（P〈0.05），说明传统疗法与硒配伍治疗慢性胃炎能更好地改善临床症状，提高治愈率。     

羟丙基-β-环糊精磁性复合微粒的合成及作为阿霉素载体的体外释药研究

羟丙基-β-环糊精因具有内部疏水和外部亲水锥形圆筒空腔结构和良好的生物相容性在磁性药物载体方面有潜在应用价值。本研究将羟丙基-β-环糊精修饰在超顺磁性纳米四氧化三铁粒子表面制备磁性复合微粒,用红外光谱,透射电镜,振动磁强计,电感耦合等离子发射等方法对该复合微粒进行了表征,并将其用于抗肿瘤药物阿霉素的体外载药与释药实验研究。结果表明该复合微粒的粒径大小在10-20nm,饱和磁化强度59.9 emu/g,铁含量55.4%。对阿霉素的载药量为87.8 μg/mg。体外释药结果显示载药复合粒子在PBS中1天,4天,10天的累积释药量分别为35.5%, 49.3%, 76.5%,表明该载体具有一定的药物缓释功能。由此可知,羟丙基-β-环糊精磁性复合微粒可作为磁性靶向给药系统的有效载体。     

Enhanced photocatalytic activity and stability of AgBr/BiOBr/graphene heterojunction for phenol degradation under visible light

In this work, we have reported synthesis of AgBr/BiOBr photocatalyst supported on graphene (Gr) using facile precipitation method. AgBr/BiOBr/Gr was characterized using various spectral techniques like FESEM, TEM, XRD, FTIR, XPS, Raman and PL analyses. AgBr/BiOBr/Gr had improved visible light absorption. PL studies indicated the reduction in recombination of photogenerated electron hole pair of AGBr/BiOBr/Gr. AFM analysis confirmed the thickness of AGBr/BiOBr/Gr was less than 8.0 nm. The higher dispersibility of photocatalyst was ascertained by Tyndall effect. AgBr/BiOBr/Gr photocatalyst was effectively used for the photodegradation of phenol from simulated water. The phenol degradation process was remarkably influenced by adsorption process. The concurrent adsorption and photocatalytic was effective for degradation of phenol. The phenol was completely mineralized into CO₂ and H₂O in 6 h. The degradation process followed pseudo first order kinetics. The results confirmed that integration of AgBr/BiOBr with graphene caused an increase in photocatalytic activity due to reduced recombination of photogenerated electron hole pair and electron sink behavior of graphene for photogenerated electrons of BiOBr. AgBr/BiOBr/Gr photocatalyst displayed significant stability and recyclability for ten catalytic cycles.     

幽门螺杆菌感染胃黏膜病变中组织硒含量与p16、PCNA关系的研究

为研究幽门螺杆菌感染的胃黏膜病变中组织硒含量与p1 6、PCNA表达相互关系 ,应用免疫组化染色法检测了 1 1 4例经胃镜及病理诊断证实的五种胃黏膜病变标本中p1 6及PCNA的表达 ;应用快速脲酶试验结合Warthin -Starry银染色确定了HP感染 ;应用MK光纤压力密闭微波溶解炉及RF -1 5 0 1荧光分光光度计检测了组织硒含量。结果表明 ,各种HP感染的胃黏膜病变中 ,组织硒含量除DYS与GC无显著性差异外 (P >0 0 5 ) ,其余各组均有显著性差异 (P <0 0 5 ) ,在CSG中升高明显 ,并随病变加重相对降低 (P <0 0 5 ) ,但高于正常组 (P <0 0 5 )。硒含量与PCNA表达呈负相关 (rs=-0 9898,P <0 0 5 ) ,而与p1 6表达呈正相关 (rs=0 91 4 3 ,P <0 0 5 )。p1 6表达HP阳性标本明显低于HP阴性标本 (P <0 0 1 ) ;PCNA表达HP阳性标本明显高于HP阴性标本(P <0 0 1 )。p1 6表达与PCNA表达呈负相关 (rs=-0 60 75 ,P <0 0 1 )。提示HP感染直接或间接地促进PCNA的表达 ,抑制p1 6的表达。HP感染的胃黏膜组织中硒含量明显升高 ,可能不仅是保护性的对抗活性氧增加的反应 ,也可能与多种癌基因表达之间存在一定的关系     

QSAR model for alignment-free prediction of human breast cancer biomarkers based on electrostatic potentials of protein pseudofolding HP-lattice networks

Network theory allows relationships to be established between numerical parameters that describe the molecular structure of genes and proteins and their biological properties. These models can be considered as quantitative structure-activity relationships (QSAR) for biopolymers. The work described here concerns the first QSAR model for 122 proteins that are associated with human breast cancer (HBC), as identified experimentally by Sj?blom et al. (Science 2006, 314, 268) from over 10,000 human proteins. In this study, the 122 proteins related to HBC (HBCp) and a control group of 200 proteins that are not related to HBC (non-HBCp) were forced to fold in an HP lattice network. From these networks a series of electrostatic potential parameters (xi(k)) was calculated to describe each protein numerically. The use of xi(k) as an entry point to linear discriminant analysis led to a QSAR model to discriminate between HBCp and non-HBCp, and this model could help to predict the involvement of a certain gene and/or protein in HBC. In addition, validation procedures were carried out on the model and these included an external prediction series and evaluation of an additional series of 1000 non-HBCp. In all cases good levels of classification were obtained with values above 80%. This study represents the first example of a QSAR model for the computational chemistry inspired search of potential HBC protein biomarkers.     

Effect of quality characteristics of single sample preparation steps in the precision and coverage of proteomic studies—A review

Proteomic profiling and biomarker search are analytical tools as many other. Nevertheless, in the proteomic discovery phase considerable sample fractionation is inevitable before readout. Since these procedures are of notable complexity, proteomic tools need in particular analytical quality validation standards as prevail for other analytical methods. With acceptance of the rule of error propagation the values of imprecision and yield of each preparation step determine overall reproducibility and therewith information harvest of a propagated method series. Thereto, we examined recent proteomic reports with reproducibility data and with parallelization, and automation approaches. Based on the data available from literature it is highly probable, that at least a part of current proteomic platforms actually suffer from high technical variance.     

基于镱和铒的α-噻吩甲酰丙酮-哌啶配合物与DNA之间相互作用的DNA探针和切割研究

两种[Ln(TTA)4].HP (Ln =Yb, Er)配合物被合成并表征。通过紫外可见光谱、荧光光谱、粘度和分子模拟研究了他们与DNA的键合特征。研究结果表明：它们能插入双链的DNA。更重要的是它们的荧光强度能被DNA增强,因此,一种灵敏的荧光检测DNA的方法被发展。两种配合物与质粒DNA的切割反应在凝胶电泳上展开。有意义的是,我们发现在pH=7.2 和 37℃下,两种化合物都能切割超螺旋质粒DNA。另外,我们选择BDNPP作为模型化合物进一步研究了它们对质粒DNA的切割机理,从一级动力学方程,我们间接证明可能是水解切割机理。     

Determination and tissue distribution studies of dantrolene sodium with hydroxypropyl‐β‐cyclodextrin in rat tissue by HPLC/MS/MS

The established analytical method for determining the concentration of dantrolene sodium (Da) in rat tissues by HPLC/MS/MS technique was successfully applied to tissue distribution studies of Da in rats. Tissue homogenate samples were pretreated by protein precipitation with pre‐cooled methanol. Chromatographic separation was achieved on an Acquity HPLC column (Kromat Universil XB‐C₁₈, 2.1 × 150 mm, 3 μm). Mass spectrometry was conducted with an electrospray ionization interface in negative ionization mode and multiple reaction monitoring was used for quantitative analysis. The results showed that Da was rapidly and widely distributed in tissues and reached the maximum concentration within 0.5 h in all tissues after oral administration of Da–hydroxypropyl‐β‐cyclodextrin (DHC). It was then metabolized by liver and finally excreted from kidney,which indicated that DHC inclusion complex has better absorption and higher oral bioavailability than Da. The results also provided evidence for the safety and effectiveness of drug clinical application.