簇合物与前配体反应条件的研究

本文总结了一些蔟合物的反应条件.并对三核羰基铁簇,Fe_3(CO)

Thermodynamic analysis on synthesis of fibrous Ni-Co alloys precursor and Ni/Co ratio control

According to the principles of simultaneous equilibrium and mass equilibrium, a series of thermodynamic equilibrium equations in Ni（II）-Co（II）-C2O4^2--NH3-NH4^＋-H2O system at ambient temperature were deduced. The diagrams of logarithm ion concentrations versus pH values at different solution compositions were drawn. The results show that Ni^2＋ and Co^2＋ can completely precipitate at pH less than 5.0 and the predefined Ni/Co ratios can be well kept in the precursor. The precursor morphology is granular aggregation. However, rod aggregation precursor is obtained in the pH range of 5.0-8.0, and fibre-shape precursor is got at pH value higher than 8.0. The Ni/Co ratios in the above two precursors are not reproduced as that in the feed due to the formhtion of multi-coordinated Ni（NH3）n^2＋ and Co（NH3）n^2＋ （n=1-6）. Modification of precipitation medium is favorable for the precursors to keep the predefined Ni/Co ratios of the feed in the pH range of 2.0-8.6. Meanwhile, the precursors with fibrous morphology can be obtained.

DNA甲基化在结直肠癌诊断中的研究进展

随着表观遗传学中DNA甲基化的深入研究,人们发现CpG岛(CpG island)DNA甲基化在结直肠癌(colorectal cancer,CRC)的临床诊断中发挥重要作用。目前,研究证实检测CRC患者组织、粪便和血液中基因的异常甲基化在CRC的早期筛查和诊断中具有很高的敏感性和特异性。本文就胞裂蛋白9(septin 9,SEPT9)、多配体聚糖2前体(syndecan 2 precursor,SDC2)、波形蛋白(vimentin,VIM)、p16和长散布核苷酸元件-1(long interspersed nucleotide element-1,LINE-1)5个基因的甲基化及其在CRC诊断中的相关进展进行了综述。

血浆胞裂蛋白9和多配体蛋白聚糖2前体甲基化联合检测与4种血清肿瘤标志物对结直肠癌诊断效果的对比性研究

目的对比血浆胞裂蛋白9(septin 9,SEPT9)和多配体蛋白聚糖2前体(syndecan-2,SDC2)甲基化联合检测与4种血清肿瘤标志物对结直肠癌诊断效果的差异。方法本研究选择2019年3—12月在徐州医科大学附属医院就诊的128例患者为研究对象进行病例对照研究。所有研究对象均行胃肠镜检查,根据病理结果分3组,结直肠癌组74例,结直肠腺瘤组7例,以胃肠镜检查未见异常或有炎性息肉或增生性息肉者作为对照组(47例)。128例研究对象均采用罗氏Lightcycler 480Ⅱ实时荧光定量聚合酶链式反应仪检测血浆SEPT9基因和SDC2基因甲基化的水平,采用罗氏Cobas 8000电化学发光仪检测血清甲胎蛋白、癌胚抗原、糖类抗原125和糖类抗原199的浓度,采用χ^(2)检验比较各标志物在3组中的阳性检出率,采用Medcalc绘制受试者工作特征曲线(receiver operating characteristic curve,ROC),对各指标诊断结直肠癌的价值进行分析。结果SEPT9基因和SDC2基因甲基化在结直肠癌组的单独阳性检出率分别为81.1%(60/74)和67.6%(50/74),当两个基因甲基化联合检测后提升至85.1%(63/74)。甲胎蛋白、癌胚抗原、糖类抗原125和糖类抗原199在结直肠癌组中阳性检出率分别为1.4%(1/74)、33.8%(25/74)、6.8%(5/74)、13.5%(10/74),4种肿瘤标志物联合检测时仅提升至43.2%(32/74),3组阳性检出率比较,除了甲胎蛋白和糖类抗原125外(χ^(2)值分别为3.847、2.430,P均>0.05),其余各指标组间比较差异均有统计学意义(P均<0.05)。SEPT9甲基化、SDC2甲基化、甲胎蛋白、癌胚抗原、糖类抗原125和糖类抗原199用于预测诊断结直肠癌的曲线下面积(area under the curve,AUC)(95%CI)分别为0.854(0.781,0.910)、0.795(0.715,0.861)、0.575(0.485,0.662)、0.685(0.597,0.764)、0.603(0.513,0.689)和0.631(0.541,0.715),两种DNA甲基化标志物联合检测的AUC(95%CI)为0.872(0.801,0.924),4种血清肿瘤标志物联合检测的AUC(95%CI)为0.712(0.625,0.789)。两种DNA甲基化标志物联合检测的AUC优于甲胎蛋白、癌胚抗原、糖类抗原125、糖类抗原199的AUC,差异均有统计学意义(甲胎蛋白:Z=4.990,P<0.001;癌胚抗原:Z=3.743,P<0.001;糖类抗原125:Z=4.951,P<0.001;糖类抗原199:Z=3.983,P<0.001);两种基因甲基化联合检测的AUC优于4种血清标志物联合检测对结直肠癌的诊断,差异有统计学意义(Z=3.334,P<0.001)。结论血浆中SEPT9基因和SDC2基因甲基化联合检测比4种血清肿瘤标志物联合检测更适合结直肠癌非侵入性诊断。

Preparations of Complex Bimetallic Oxides from Bimetallic Assemblies Containing Different Copper（Ⅱ） Precursors and Comparison of Some Related Systems

This is a mini-review-like article including our recent results and methods for （new） metal oxides and （previously reported） composite materials composed of metal complexes and metal oxides for comparison to enhance anisotropic structural changes intentionally. Some complex inorganic oxides are known that they may be promising color materials （absorbing visible light of certain wavelengths region） having potential application for environmentally benign catalysts, for example, photocatalysts. Chiral copper（Ⅱ） complexes having bidentate amine ligands （[CuL2]2＋） can be acted as cationic building blocks of bimetallic metal complexes. We have prepared some chiral bimetallic complexes with various anionic metal complexes such as [PtCl4]2-, [M02O7]2 and Mn12 clusters （typical single-molecule magnets） which characterized by means of solid-state electronic and CD （circular dichroism） spectra, IR （infrared） spectra, synchrotron XRD （X-ray diffraction） and XAS （soft X-ray absorption spectroscopy）. By sintering these precursor chiral bimetallic complexes, we have prepared complex inorganic oxides from them. The IR spectra indicated substituting metal-ligand bonds and losing organic moieties. The XRD pattern indicated complete changes of crystal structures. The XAS revealed replacing coordination atoms as well as oxidation of valences of metal ions. Furthermore, we will also investigate possibility of patterning by homogeneous precipitation method as bimetallic complexes to prepare desirable complex inorganic oxides.

肿瘤坏死因子受体1 PLAD结构域工程菌表达条件的优化

为提高可溶性GST-PLAD蛋白的表达量,对含有GST-PLAD基因的E.coli BL21(DE3)工程菌的发酵条件进行优化。采用单因素实验和正交实验,对影响大肠杆菌生长及融合蛋白表达的培养基组分、培养条件进行了优化。结果显示最优培养基配比(%)为:蔗糖0.5、蛋白胨1、酵母提取物1.5、硫酸铵0.4、氯化钠1、硫酸镁0.03;最佳表达条件为:诱导剂IPTG浓度为0.4 mmol/L,37℃培养5.5 h,诱导9 h,摇瓶装瓶量为100 mL/500 mL。表达条件优化后菌体生长密度是优化前的1.89倍,GST-PLAD表达量是优化前的2.05倍。

Binaphthyl-bridged bis-imidazolinium salts as N-heterocyclic carbene ligand precursors in the palladium-catalyzed Heck reaction

Two new bis-imidazolinium salts (4a, 4b) have been synthesized as precursors of N-heterocyclic carbenes (NHCs) from the commercially available (R)-2,2′-dihydroxy-1,1′-binaphthalene. The two bis-imidazolinium salts were used as efficient precursor of NHC ancillary ligands in the palladium-catalyzed Heck reaction. Good to excellent yields and high stereoselectivities were obtained with ethyl acrylate, acrylonitrile, and acrylamide as starting materials. The structure of bis-imidazolinium salt 4b was further characterized by single crystal X-ray diffraction analysis.

Adipo8, a high-affinity DNA aptamer, can differentiate among adipocytes and inhibit intracellular lipid accumulation in vitro

Obesity is primarily caused by the excessive accumulation of white adipose tissues(WAT). We previously obtained an adipocyte-specific aptamer termed Adipo8 in vitro. In this present study, this adipocyte-specific aptamer Adipo8 was first chemically modified by introduction of phosphorothioate linkages(PS-linkages) and then conjugated to polyethylene glycol(PEG), we tested whether this modified aptamer could distinguish mature white adipocytes from 3T3-L1 preadipocytes or brown adipocytes. To verify the binding affinity of this aptamer to mature white adipocytes in vivo as well as in vitro, we tested whether modified Adipo8 could specifically bind to the WAT of Diet-Induced Obesity(DIO) C57BL/6 mice. Finally, we examined the effect of Adipo8 on the adipogenic differentiation of mature white adipocytes. Based on our results, PS-modified aptamer demonstrated its high binding affinity and specificity, and was able to distinguish white adipocytes from 3T3-L1 preadipocytes or brown adipocytes in vitro. PS-modified Adipo8 also demonstrated more biostability and prolonged binding time in biological fluids. Additionally, Adipo8 could inhibit adipogenic differentiation of adipose tissue, possibly by inhibiting the expression of PPAR-γ in adipose tissue. This modified aptamer holds great promise as a stable molecular recognition tool for targeted delivery to adipocytes and has potential in the treatment of obesity.