Solvothermal synthesis of transition metal (iron/copper) and nitrogen co−doped carbon nanomaterials: comparing their peroxidase−like properties

Journal of Nanoparticle Research - Polycrystalline metallic copper nanoparticle samples with the average particle sizes ranging from 53 to 80 nm were controllably prepared by the wet...     

细菌感染成像的研究进展

由致病菌或条件致病菌侵入机体繁殖而产生的毒素和其它代谢产物所引起的感染性疾病是目前全球范围内的主要死亡原因之一. 感染性疾病的早期诊断是对其进行有效治疗与控制的重要途径. 分子影像技术的快速发展给体内细菌感染的评估带来了前所未有的变化和机遇. 本文综合评述了计算机断层扫描、 正电子发射断层扫描、 超声成像、 磁共振成像、 荧光成像及光声成像等成像方式在细菌感染体内成像中的研究进展、 不足和发展方向等, 以期为活体细菌感染检测方法的发展提供参考.     

Near-infrared emission carrier,Er3+-doped ZnAl-LDH,for delivery and release of ibuprofen in vitro

Journal of Sol-Gel Science and Technology - A drug delivery system with near-infrared emissions response to drug delivery and release is essential as marking or targeting drug delivery system. For...     

经腹彩色多普勒超声检查对子宫内膜异位症的诊断价值

本研究选取我院100例子宫内膜异位症患者作为病例组、同期健康妇女100例作为对照组,探讨了经腹彩色多普勒超声检查对子宫内膜异位症患者子宫动脉血流特征、子宫特征的诊断价值。结果显示,病例组的子宫体积、子宫内膜厚度测定值均大于对照组(P<0.05);摆动子宫颈后,病例组的EDV测定值低于对照组,RI测定值大于对照组(P<0.05);通过绘制ROC曲线,可知EDV、RI、子宫体积大小、子宫内膜厚度诊断子宫内膜异位症的AUC值均超过0.65,灵敏度和特异度都较高,漏诊率和误诊率也在可控范围内。本研究证实,通过经腹彩色多普勒超声检测子宫动脉血流参数及子宫形态特征,对诊断子宫内膜异位症具有一定的临床参考价值。     

Molecular simulation study on the self-assembly behaviors of zwitterionic heterogemini surfactant in aqueous solution

The self-assembly behaviors of a series of zwitterionic heterogemini surfactants C_mH_2m+1-PO^4–(CH₂)₂-N⁺(CH₃)₂-C_nH_2n+1, abbreviated as C_m-P-N-C_n (m, n?=?9, 9; 9, 12; 9, 15; 9, 18; 12, 12; 12, 15; 12, 18; 15, 15; 15, 18; 18, 18), have been investigated in aqueous solution by the dissipative particle dynamics (DPD) method. Morphologies such as sphere (S), rod (R), planar grid (PG), lamella (L), honeycomb (H), one-, two-, and three-dimensional tunnels (1DT, 2DT, and 3DT) have been observed showing more diversities than those of the corresponding symmetric gemini surfactants C_m-N-N-C_m (m?=?9, 12, 15, 18). With the increase of surfactant concentration in the aqueous solution, a distinct transition path ‘‘S—R—PG—3DT—L—2DT—1DT’’ is proved to be common for all the C_m-P-N-C_n systems. Besides, the hydrophobic chain length has a significant influence on the self-assembly behaviors in the case of m?≠?n. Radial distribution function is an effective method to quantitatively evaluate the interaction and relationship between each functional group in the surfactant molecule and water. Results can provide a new insight into the self-assembly behaviors of zwitterionic heterogemini surfactants and the corresponding applications.     

Unveiling the Promotion of Surface-Adsorbed Chalcogenate on the Electrocatalytic Oxygen Evolution Reaction

Transition metal chalcogenides (TMCs) are efficient oxygen evolution reaction (OER) pre-electrocatalysts, and will in situ transform into metal (oxy)hydroxides under OER condition. However, the role of chalcogen is not fully elucidated after oxidation and severe leaching. Here we present the vital promotion of surface-adsorbed chalcogenates on the OER activity. Taking NiSe₂ as an example, in situ Raman spectroscopy revealed the oxidation of Se-Se to selenites (SeO₃²⁻) then to selenates (SeO₄²⁻). Combining the severe Se leaching and the strong signal of selenates, it is assumed that the selenates are rich on the surface and play significant roles. As expected, adding selenites to the electrolyte of Ni(OH)₂ dramatically enhance its OER activity. And sulfates also exhibit the similar effect, suggesting the promotion of surface-adsorbed chalcogenates on OER is universal. Our findings offer unique insight into the transformation mechanism of materials during electrolysis.     

[1,2,4]三唑并[3,4-b][1,3,4]噻二嗪类衍生物的合成及生物活性研究进展

[1,2,4]三唑并[3,4-b][1,3,4]噻二嗪作为极具前景的活性基团,在抗菌、抗肿瘤等方面具有多种药理活性,在药物和化学领域受到了广泛的关注。本文以含三唑并噻二嗪结构化合物的合成及其在抗肿瘤、抗菌等方面的生物活性为依据,对近几年国内外关于[1,2,4]三唑并[3,4-b][1,3,4]噻二嗪类化合物的研究进行分析总结,以期为后续该类新型抗肿瘤化合物的设计合成提供参考。     

烯丙基化碳纳米管改善丙烯酸酯压敏胶的性能

本文利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH570)对多壁碳纳米管(MWNTs)进行修饰使其表面接枝上烯丙基官能团,与丙烯酸酯类单体进行原位聚合,制备了一种耐高温丙烯酸酯压敏胶(PSA)。 通过傅里叶变换红外光谱仪(FT-IR)、热重分析仪(TGA)和扫描电子显微镜(SEM)表征了MWNTs和丙烯酸酯PSA的结构与性能,探讨了改性MWNTs的质量分数对PSA耐热性能和粘接性能的影响。 结果表明,与未改性的丙烯酸酯PSA相比,当改性MWNTs的质量分数为1.5%时,改性丙烯酸酯PSA的耐热性能和粘接性能最佳,热分解温度从360 ℃提高到了382 ℃,耐热温度从80 ℃提高到了155 ℃,初粘力、持粘力和180°剥离强度分别从2 h和13.66 N/(25 mm)(12号小球)提高到了27 h和17.34 N/(25 mm)(17号小球)。     

Fluorescence detection of adenosine-5′-triphosphate and alkaline phosphatase based on the generation of CdS quantum dots

We have developed an analytical method to detect adenosine-5′-triphosphate (ATP) and alkaline phosphatase (ALP) based on the generation of CdS quantum dots (QDs). We demonstrated that Cd²⁺ cation reacts with S²⁻ anion to generate fluorescent CdS QDs in the presence of some certain amount of ATP. With increase in the ATP concentration, the fluorescence intensity of CdS QDs was also enhanced. ATP can be converted into adenosine by the dephosphorylation of ALP, so that the generation of CdS QDs would be inhibited in the presence of ALP. Therefore, this novel analysis system could be applied to assay ATP and ALP based on the growth of fluorescent CdS QDs.     

基于SIFT匹配的全局运动估计方法

提出了一种基于SIFT(Scale invariant feature transform)匹配的全局运动估计算法.在SIFT初匹配的基础上,对每一个原始匹配特征点,利用所在尺度的邻域灰度信息,对其加权平均后再进行匹配,进而去除误配点.精炼后的匹配点集合作为求解全局运动参数模型的对应数据,采用最小二乘法计算模型参数.在...