氟苯尼考胶体金免疫层析定量检测方法的建立

建立了定量检测氟苯尼考的胶体金免疫层析方法.对胶体金标记抗体时溶液pH和抗体浓度、金标抗体用量、检测线上抗原浓度以及检测时间进行了优化.采用胶体金试纸条读取仪测定试纸条检测线和质控线的信号强度,以标准品的浓度为横坐标,阳性样本和阴性样本的检测线/质控线的信号比值(Bx/B0)为纵坐标建立标准曲线.结果表明,胶体金免疫层析试纸定量检测氟苯尼考的线性范围为0.1~1.5 ng/mL,检出限为0.08 ng/mL,检测时间为15 min.本方法具有简便、快速和可定量等特点,适于大批量样品的现场筛查.     

溶剂热法制备钴微球及其表征

<正>0引言过渡金属钴以及它的一些氧化物,以其特殊的电、磁和光学性能被广泛应用到信息存储[1]、催化剂[2]、磁光材料[3]、铁磁流体[4]以及生物医学[5]等诸多领域。前人曾经用羰酰钴热解法[6-7]、γ射线照射法[8]、光刻气相沉积法[9]、电化学沉积法[10]和金属盐溶液的     

离子交换法合成钴酸锌纳米空心材料及磁性

采用所合成的四氧化三钴纳米立方颗粒作为前驱体,在相对低温的水热条件下,通过反应体系中自身存在的扩散作用和离子交换作用,可控制备了钴酸锌纳米空心材料。利用SEM、TEM、EDS和XRD等测试方法对样品进行了形貌、结构、组成和物相的表征。结果表明,所得钴酸锌纳米盒粒径均匀,分散度好;钴酸锌纳米盒颗粒大小约为20nm,整个纳米盒为单晶。研究了钴酸锌纳米盒的生长机理。对所制备的材料进行了磁学性质测试,结果显示,尖晶石型结构钴酸盐纳米材料的磁性大小可以通过改变实验条件而加以调变。     

8-羟基喹啉铱(Ⅲ)配合物的合成及其光学性质

以2-苯基吡啶为原料,经两步反应合成了3个8-羟基喹啉衍生物铱(Ⅲ)配合物(2a~2 c),并研究和比较了2的光学性质和电化学行为。     

壳聚糖水凝胶微球的制备与溶胀性能

采用三聚磷酸钠(TPP)和六偏磷酸钠(SHMP)为复合交联剂,制备了离子交联网络结构的壳聚糖水凝胶微球。分析讨论了交联剂质量配比、pH以及离子强度等对壳聚糖微球溶胀性能的影响。结果表明:使用复合交联剂制备的微球的溶胀度比单独使用TPP或SHMP的分别低62.4%和41.3%,交联效率得到明显提高;当m(TPP)∶m(SHMP)=3∶5,交联剂pH=5时,制备的微球交联程度最好,结构最密实;在pH=1.2的缓冲溶液中,溶胀度可达到357%,而且凝胶没有任何破碎。微球具有较好的离子强度和pH敏感性,在酸性介质中有较高的溶胀度。     

Study of the effect of atorvastatin on the interaction between ICAM-1 and CD11b by live-cell single-molecule force spectroscopy

The interaction between the cell adhesion molecule CD11b and its ligand ICAM-1 plays an important role in inflammatory responses in the disease of atherosclerosis. Atorvastatin is a commonly prescribed statin drug which has been considered as one of the most potent therapeutic agents for atherosclerosis due to its lipid-lowering effect. Recently, there is a growing body of evidence that atorvastatin has anti-inflammatory effect. We have applied the advanced method of live-cell single-molecule force spectros...     

羊抗人IgG在金纳米通道中的迁移

以聚碳酸酯超滤膜为基板,用化学镀的方法在超滤膜上沉积金,制得直径在45nm左右的金纳米通道阵列,利用制得的金纳米通道阵列搭建离子电流测量平台,可实现对羊抗人IgG分子的浓度检测.当羊抗人IgG分子通过直径45nm的金纳米通道时,由于物理占位及表面电荷的影响,会引起离子电流发生变化;在KCl浓度为0.15mol/L(pH7.48)溶液中,IgG分子的物理占位对离子电流有阻塞作用,会导致电流减小,IgG浓度在1.8～18ng/mL范围内,减小量与浓度成线性关系;实现了对IgG的定量检测.KCl浓度降低到0.025mol/L时,由于IgG分子扩散层内反离子对通道内离子浓度的贡献占主导地位,从而造成离子电流随着IgG浓度增大而增大.     

基于抗肿瘤活性化合物MED烟酸类衍生物的设计及作用靶点

通过变性荧光素酶的再复性实验发现真菌环氧二烯(Mycoepoxydiene,MED)对热休克蛋白(Heat shock protein 90,Hsp90)具有抑制作用.Western Blot实验结果表明,MED影响人宫颈癌细胞株HeLa中Hsp70及Hsp90的客户蛋白质(Akt,Raf-1)的表达,表明MED是Hsp90的抑制剂.通过靶向对接技术预测了MED与人Hsp90 N端ATP结合位点的结合情况,并在此基础上发现,MED的烟酸类衍生物4-NDM与Hsp90的结合具有比MED与Hsp90更强的亲和作用.体外实验结果证明,MED的烟酸类衍生物4-NDM及3-NDM对HeLa细胞表现出比MED更强的细胞毒活性;可通过上调Hsp70,并下调Akt和Raf-1而影响HeLa细胞中Hsp90相关蛋白质的表达.由此推测,MED及其烟酸类衍生物可以通过抑制Hsp90,而使其客户蛋白Akt或Raf-1发生降解,发挥其抗肿瘤作用.     

Boron-doped Covalent Triazine Framework for Efficient CO2 Electroreduction

Converting CO₂ into chemicals with electricity generated by renewable energy is a promising way to achieve the goal of carbon neutrality. Carbon-based materials have the advantages of low cost, wide sources and environmental friendliness. In this work, we prepared a series of boron-doped covalent triazine frameworks and found that boron doping can significantly improve the CO selectivity up to 91.2% in the CO₂ electroreduction reactions(CO₂RR). The effect of different doping ratios on the activity by adjusting the proportion of doped atoms was systematically investigated. This work proves that the doping modification of non-metallic materials is a very effective way to improve their activity, and also lays a foundation for the study of other element doping in the coming future.     

DFT Study on the Correlation between Thermodynamical Property and Molecular Structure of Polybromo-phenoxathiin

Complete optimization was conducted for 136 polybromo-phenoxathiin congeners(PBPTs) on the B3LYP/6-31G* level with Gaussian 03 program.The structural parameters and thermodynamical parameters of each molecule were obtained under the standard state of 298.15 K and 1.013×105 Pa.Reverse linear regression was employed to establish the quantitative structure-property correlation models between heat capacity at constant volume(CVθ),entropy(Sθ),standard heat of formation(△fHθ) and standard free energy of formation(△fGθ) of PBPTs and the structural parameters(the most negative atomic charge(q-) and molecular average polarizability(α)).These models presented better correlations(r20.97).And they were validated by variance inflation factor(VIF) and t-test,which can better explain the regularity of thermodynamical property of PBPTs,and has good stability and great prediction ability.