High-frequency supercapacitors with phosphorus-doped Ketjen black

Compact supercapacitors(SCs)have attracted attention for their great potential to replace bulky aluminum electrolytic capacitors(AECs)in alternating current(AC)line filtering applications.Herein,the fabrication of a high-frequency SC is reported using Ketjen black(KB)nanoparticles doped with phosphorus(P)to achieve a high areal capacitance of up to 2.26 mF cm^(-2)along with a high-rate capability,with a phase angle of-80.2°at 120 Hz.The high performance of the phosphorus-doped KB(designated PKB)SC with a 6 M KOH aqueous electrolyte is associated with its increased surface wettability and additional capacitive sites provided by the P-doping.Density functional theory(DFT)calculations further indicate that the P-doping enhances the interactions between the electrolyte ions and the carbon surface,thus leading to an improved electrochemical performance.These results suggest that the P-doped carbonbased SC could be highly favored in replacing conventional AECs in various high-frequency electronic devices.

Regional Effect of APS-sEPS on Intestinal Structure and Mucosal Immunity in Mice

[Objectives]The aim of this study was to investigate the effects of APS-sEPS(a polysaccharide compound of Astragalus polysaccharides and sulfated Epimedium polysaccharide)on intestinal mucosal immunity and structural morphology.[Methods]Firstly,the diarrhea model was established using the optimal dose of magnesium sulfate in mice.Then,the diarrhea mice were randomly divided into three groups and given either physiological saline(diarrhea model group)or injected with APS-sEPS or APS.The normal mice were selected as a control group.After administration,the duodenum,jejunum and ileum were processed microtome section,and observed for describing the small intestine morphology,villus height and crypt depth.The tissue homogenates of the duodenum,jejunum and ileum were gathered to detect the changes of sIgA,IL-4 and IL-10.[Results]The results indicated that APS-sEPS could effectively relieve diarrhea in mice.In the APS-sEPS group,the villus heights of duodenum,jejunum and ileum were increased and the depth of crypt was reduced.The contents of IL-4,IL-10 and sIgA in jejunum and ileum in APS-sEPS group were significantly higher than that in the control group(P<0.05).[Conclusions]These results indicated that APS-sEPS promoted the recovery of intestinal morphological structure and enhanced the mucosa immunity of the small intestine.

“一带一路”澜湄区域国家通信发展与产品认证研究

调研了澜湄区域内国家通信发展基本状况,研究了泰国、越南等澜湄区域国家的通信产品的认证认可制度,为通信产品的贸易便利化提供基础研究信息,为我国通信企业实施“走出去”的战略目标提供有效的参考。

A highly selective C-rhamnosyltransferase from Viola tricolor and insights into its mechanisms

C-Glycosides are important natural products with various bioactivities.In plant biosynthetic pathways,the C-glycosylation step is usually catalyzed by C-glycosyltransferases(CGTs),and most of them prefer to accept uridine 5’-diphosphate glucose(UDP-Glc)as sugar donor.No CGTs favoring UDP-rhamnose(UDP-Rha)as sugar donor has been reported,thus far.Herein,we report the first selective C-rhamnosyltransferase VtCGTc from the medicinal plant Viola tricolor.VtCGTc could efficiently catalyze C-rhamnosylation of 2-hydroxynaringenin 3-C-glucoside,and exhibited high selectivity towards UDP-Rha.Mechanisms for the sugar donor selectivity of VtCGTc were investigated by molecular dynamics(MD)simulations and molecular mechanics with generalized Born and surface area solvation(MM/GBSA)binding free energy calculations.Val144 played a vital role in recognizing UDP-Rha,and the V144T mutant could efficiently utilize UDP-Glc.This work provides a new and efficient approach to prepare flavonoid C-rhamnosides such as violanthin and iso-violanthin.

博斯腾湖有机物污染改善方案研究

博斯腾湖径流入湖、出湖口过近的水文现状对有机物浓度及其空间分布形成制约。采用MIKE21软件构建水动力水质二维数值模型,分析工程方案对博斯腾湖有机物污染的改善效果。根据模拟结果以及配对样本T检验分析:在现状基础上实施扬水站东移或引开都河水3×10^8m^3·a^-1进入黄水沟,均可显著改善博斯腾湖有机物污染,年均化学需氧量(COD)浓度分别降低13.4%和8.91%;两方案同时实施效果更为显著,年均COD浓度降低20.2%;通过工程实施改善博斯腾湖有机物污染切实可行。但在流域尺度上,工程方案仅改变了有机物平衡而未改变总量,博斯腾湖有机物污染改善源于污染物转移至下游孔雀河。

海南岛蚯蚓物种组成及其系统发育分析

海南岛独特的地理位置和复杂的古地理事件使其成为我国生物多样性的热点地区。已有的海南岛蚯蚓资料显示,该岛的蚯蚓区系十分特殊,且与大陆地区蚯蚓存在扩散与迁移。然而,当海南岛与周围大陆断开形成独立岛屿后,海南岛蚯蚓如何为适应海南岛的环境而逐渐形成现在岛内的分布与区系,仍然是一个值得研究和探讨的问题。因此,本研究在海南岛全面调查和采集蚯蚓标本,整理海南岛地区的蚯蚓物种组成及其地理分布特征,并联合5个线粒体基因COⅠ、COⅡ、ND1、12S rRNA和16S rRNA构建海南岛蚯蚓的分子系统发育树,推测其分化时间和祖先分布区域,探讨海南岛蚯蚓在岛内的分化与扩散过程。研究结果表明:(1)海南岛共有蚯蚓6科9属122种,巨蚓科蚯蚓为优势科,且全部为环毛类蚯蚓,其中103种为海南岛特有种。蚯蚓物种数沿海拔呈先增加后减少的趋势,在800‒1,000 m最大;(2)海南岛环毛类蚯蚓不同水平的遗传距离与我国巨蚓科蚯蚓的遗传距离区间基本一致。物种水平上,美丽远盲蚓(Amynthas scitulus)与纬向远盲蚓(A.zonarius)的基因遗传距离最小。在亚种水平,保宁腔蚓指名亚种(Metaphire magna magna)和保宁腔蚓小型亚种(M.magna minuscula)的遗传距离均接近整体的物种水平。在种群水平,等毛远盲蚓(A.homosetus)不同种群间遗传距离均接近整体的亚种水平;(3)海南岛环毛类蚯蚓可划分为7个类群,其祖先于68.26 Ma开始分化,可能起源于吊罗山。在新生代,7个类群均得到较大发展。通过对海南岛蚯蚓组成及系统发育的梳理,不仅为我国蚯蚓物种多样性研究提供基础资料,也为岛屿蚯蚓物种系统发育关系分析提供科学参考。