Critical Solvation Structures Arrested Active Molecules for Reversible Zn Electrochemistry

Aqueous Zn-ion batteries(AZIBs)have attracted increasing attention in next-generation energy storage systems due to their high safety and economic.Unfortunately,the side reactions,dendrites and hydrogen evolution effects at the zinc anode interface in aqueous electrolytes seriously hinder the application of aqueous zinc-ion batteries.Here,we report a critical solvation strategy to achieve reversible zinc electrochemistry by introducing a small polar molecule acetonitrile to form a“catcher”to arrest active molecules(bound water molecules).The stable solvation structure of[Zn(H_(2)O)_(6)]^(2+)is capable of maintaining and completely inhibiting free water molecules.When[Zn(H_(2)O)_(6)]^(2+)is partially desolvated in the Helmholtz outer layer,the separated active molecules will be arrested by the“catcher”formed by the strong hydrogen bond N-H bond,ensuring the stable desolvation of Zn^(2+).The Zn||Zn symmetric battery can stably cycle for 2250 h at 1 mAh cm^(-2),Zn||V_(6)O_(13) full battery achieved a capacity retention rate of 99.2%after 10,000 cycles at 10 A g^(-1).This paper proposes a novel critical solvation strategy that paves the route for the construction of high-performance AZIBs.

AlLi相对Mg−Li合金热压缩变形行为和动态再结晶的影响

采用等温热压缩实验研究含有AlLi相的Mg−5Li−3Al−2Zn(LAZ532)合金的热变形行为;变形温度和应变速率范围分别为473~623 K和0.001~1 s^(−1)。LAZ532合金热变形过程中AlLi相能够阻碍位错运动,从而显著提高合金的峰值应力值。为精确预测LAZ532合金的热变形行为,构建相应的应变补偿Arrhenius本构模型,预测结果与实验结果吻合良好。基于Murty准则,建立相应的热加工图,合理的加工区域在538~623 K和0.001~0.01 s^(−1)范围内。在高应变速率变形条件下,AlLi相不利于LAZ532合金在热压缩过程中的流动稳定性和动态再结晶。此外,变形温度会改变LAZ532合金的动态再结晶形核机制。

非小细胞肺癌中lncRNA DLEU1的表达对肿瘤细胞转移的影响

目的:研究长片段非编码RNA(long non-coding RNA,lncRNA)淋巴细胞白血病缺失基因1(deleted in lymphocytic leukemia1,DLEU1)在非小细胞肺癌(non-small cell lung cancer,NSCLC)中的表达模式和临床意义,并进一步评估其对肿瘤转移的影响。方法:42例NSCLC患者配对的癌组织和癌旁组织于2008年1月至2012年12月在中南大学湘雅三医院经手术切除获得。采用实时定量聚合酶链反应检测NSCLC组织和细胞中DLEU1的表达特征。运用统计学方法分析DLEU1的表达与NSCLC患者临床病理特征及生存时间的关系。通过体外伤口愈合和细胞侵袭试验分析DLEU1对NSCLC细胞迁移及侵袭的影响。运用蛋白质印迹法检测DLEU1对NSCLC细胞上皮间质转化(EMT)的标志物(E-钙粘蛋白、N-钙黏蛋白和波形蛋白)表达量的影响。结果:42例NSCLC样本中,DLEU1的表达在35例中表现出上调(83.33%),而在7例中表现出下调(16.67%)。DLEU1在NSCLC癌组织的表达量是癌旁组织的2.11倍(P<0.05)。DLEU1在4种NSCLC细胞系(A549、H1299、SPCA1和H358)的表达量均高于正常肺16HBE上皮细胞,其中,A549细胞中DLEU1表达量最高(P<0.05)。高表达的DLEU1与淋巴结转移呈正相关(P<0.05),但与其他参数无显著相关性,包括患者性别、年龄、吸烟史、原发肿瘤大小、组织学分级和TNM分期。与低DLEU1表达组患者相比,高表达组患者生存时间显著缩短(P<0.05)。与对照组相比,体外干扰DLEU1的表达可显著抑制A549和SPCA1细胞的迁移和侵袭能力(P<0.05)。与对照组相比,体外干扰DLEU1可显著增加A549细胞中E-钙黏蛋白表达量,而降低N-钙黏蛋白和波形蛋白表达量(P<0.05)。结论:DLEU1在NSCLC组织和细胞系中表达上调,并与患者淋巴结转移和生存时间相关,且具有通过EMT促进肿瘤细胞迁移和侵袭的功能,表明DLEU1可能作为NSCLC的潜在治疗靶点。

Gastric duplication cyst mimicking large cystic lymphangioma in an adult: A rare case report and review of the literature

BACKGROUND Gastric duplication cysts(GDCs)are a relatively uncommon congenital developmental abnormality,mainly occurring in infants but very rarely in adults.Because of the variability in clinical presentation,it is often quite challenging to diagnose GDCs in adults.We are presenting a case report of an adult diagnosed operatively as having a GDC with a literature review to summarize clinical and imaging features and the treatment selections of GDCs in adults so that doctors could have a comprehensive understanding of this disease and make a precise diagnosis and a suitable therapeutic decision for patients.CASE SUMMARY A 51-year-old man presented with recurrent epigastric pain and fullness for two years.No significant findings were noted during physical examination and routine blood tests were unremarkable.An abdominal ultrasound revealed a large cyst in the upper left abdominal quadrant.A following contrast-enhanced abdominal computed tomography(CT)scan demonstrated a hypodense cystic lesion between the spleen and stomach.The lesion had scattered calcification in the cyst wall without any significant enhancement.The lesion was initially thought to be a cystic lymphangioma.The patient underwent a surgical resection and intraoperatively it was noted that the lesion was closely adherent to the greater curvature of the stomach.Subsequently,a resection of the gastric mass along with a partial gastrectomy was performed.The patient recovered quickly with a complete symptomatic relief and did not show any further complications during the 8-month follow-up.CONCLUSION GDCs are quite rare in adults,with a multitude of symptoms,which is quite challenging for precise diagnosis before histological examination.Some imaging techniques involving CT,magnetic resonance imaging,and endoscopic ultrasound could provide valuable morphological features for differential diagnosis.

The Research about Prescribed Workspace for Optimal Design of 6R Robot

Based on the D-H notation, kinematics model and inverse kinematics model of 6R industrial robots are established. Using graphical method, the boundary curve equations of the 6R industrial robot workspace are obtained. Based on the prescribed workspace, the D-H parameter optimization method of 6R industrial robots is proposed. Using the genetic algorithm to determine the structural dimensions of a 6R robot, we make sure that its workspace can exactly contain the prescribed workspace. This method can be used to reduce the overall size of the robot, save materials and reduce the power consumption of the robot during its work time.

Nickel-Catalyzed Direct Coupling of Allylic Alcohols with Organoboron Reagents

The direct coupling of allylic alcohols with arylboronic acids or their derivatives catalyzed by Ni（cod）2 in the presence of a catalytic amount of base has been developed. A wide variety of allylic substrates or aryIboronic acids turned out to be applicable to this catalytic system. The present method does not require the use of ligands for stabilizing the nickel catalyst in most cases or additional activators for activation of altylic alcohols.

NH_(4)^(+)插层Mo掺杂MnO_(2)阴极实现强键合作用助力超稳定水系锌锰电池

水系可充电锌/二氧化锰电池因其成本低廉、能量密度高而引起了广泛关注.然而,缓慢的反应动力学和MnO_(2)阴极的歧化反应以及不可逆的相变现象对其发展造成了严重阻碍.在此,我们选用了Mo掺杂α-MnO_(2)(Mo–MnO_(2))作为阴极材料,通过铵根离子插层机制所形成的N–H···O强键合作用来稳定Mo–MnO_(2)的2×2隧道结构,并且有效抑制了Mn^(3+)溶解,在质子插入/脱出过程中不会引起晶格的畸变,进一步提高了其循环稳定性.获得的Mo–MnO_(2)正极在100 mA g^(−1)时表现出265.2 mA h g^(−1)的高比容量和364.3 W h kg^(−1)的能量密度.在2.0 A g^(−1)下1000次循环后,容量保持率达95.2%.这项工作有助于深入了解非金属阳离子在电极主体材料间的键合作用,为设计具有高能量密度和长期循环能力的水系锌离子电池提供了新思路.

THF_1 mutations lead to increased basal and wound-induced levels of oxylipins that stimulate anthocyanin biosynthesis via COI_1 signaling in Arabidopsis

Mutants defective in chloroplast development or photosynthesis are liable to accumulate higher levels of anthocyanin in photo-oxidative stress.However,regulatory mechanisms of anthocyanin biosynthesis in the mutants remain unclear.Here,we investigated the mechanism by which the deletion of thylakoid formation1（THF1） leads to an increased level of anthocyanin in Arabidopsis thaliana L.Physiological and genetic evidence showed that the increased level of anthocyanin in thf1 is dependent on coronatine-insensitive1（COM）signaling.Our data showed that thf1 had higher levels of basalα-linolenic acid（α-LeA）,and methyl jasmonate（JA）-induced α-LeA and 12-oxophytodienoic acid（OPDA） than the wild type（WT）.Consistently,expression levels of phospholipase genes including pPLAIIα and PLA-Iγ1 were elevated in thf1.Furthermore,inhibition of lipase activity by bromoenol lactone,a specific inhibitor of plant pPLA,led to producing identical levels of anthocyanins in WT and thf1 plants.Interestingly,OPDA biosynthesis was triggered by light illumination in isolated chloroplasts,indicating that new protein import into chloroplasts is not required for OPDA biosynthesis.Thus,we conclude that the elevated anthocyanin accumulation in thf1 is attributed to an increase in JA levels.This JA-mediated signaling to coordinate plant metabolism and growth in stress may be conserved in other photosensitive mutants.

Carfilzomib inhibits the growth of lung adenocarcinoma via upregulation of Gadd45a expression

Proteasome inhibitors have shown remarkable success in the treatment of hematologic neoplasm.There has been a lot of attention to applying these drugs for solid tumor treatment.Recent preclinical study has signified the effectiveness on cell proliferation inhibition in lung adenocarcinoma treated by carfilzomib(CFZ),a second generation proteasome inhibitor.However,no insight has been gained regarding the mechanism.In this study,we have systematically investigated the CFZ functions in cell proliferation and growth,cell cycle arrest,and apoptosis in lung adenocarcinoma cells.Flow cytometry experiments showed that CFZ significantly induced G2/M cell cycle arrest and apoptosis in lung adenocarcinoma.MTS and colony formation assays revealed that CFZ substantially inhibited survival of lung adenocarcinoma cells.All results were consistently correlated to the upregulation expression of Gadd45a,which is an important gene in modulating cell cycle arrest and apoptosis in response to physiologic and environmental stresses.Here,upregulation of Gadd45a expression was observed after CFZ treatment.Knocking down Gadd45a expression suppressed G2/M arrest and apoptosis in CFZ-treated cells,and reduced cytotoxicity of this drug.The protein expression analysis has further identified that the AKT/FOXO3a pathway is involved in Gadd45a upregulation after CFZ treatment.These findings unveil a novel mechanism of proteasome inhibitor in anti-solid tumor activity,and shed light on novel preferable therapeutic strategy for lung adenocarcinoma.We believe that Gadd45a expression can be a highly promising candidate predictor in evaluating the efficacy of proteasome inhibitors in solid tumor therapy.

Favorable anion adsorption/desorption of high rate NiSe_(2) nanosheets/hollow mesoporous carbon for battery-supercapacitor hybrid devices

High-rate battery-type cathode materials have attracted wide attention for advanced battery-supercapacitor hybrid(BSH)devices.Herein,a core-shell structure of the hollow mesoporous carbon spheres(HMCS)supported NiSe2 nanosheets(HMCS/NiSe2)is constructed through two-step reactions.The HMCS/NiSe_(2)shows a max specific capacity of 1,153.5 C·g^(-1) at the current density of 1 A·g^(-1),and can remain at 774.5 C·g^(-1) even at 40 A·g^(-1)(the retention rate as high as 67.1%)and then the HMCS/NiSe_(2) electrode can keep 80.5%specific capacity after 5,000 cycles at a current density of 10 A·g^(-1).Moreover,the density functional theory(DFT)calculation confirmed that the introduction HMCS into NiSe_(2) made adsorption/desorption of OH-easier,which can achieve higher rate capability.The HMCS/NiSe_(2)//6 M KOH//HMCS hybrid device has energy density of 47.15 Wh·kg^(-1) and power density of 801.8 W·kg^(-1).This work provides a feasible electrode material with a high rate and its preparation method for high energy density and power density energy storage devices.

Nickel-Catalyzed Cross-Coupling of Aryl Pivalates with Cyclobutanols Involving C-O and C-C Bond Cleavage

of main observation and conclusion An efficient nickel-catalyzed cross-coupling of aryl pivalates with cyclobutanols is described.The use of Ni(cod)2/PCy3/base as the catalytic system enables the cleavage of inert C—0 bond and C—C bond under mild conditions,thus providing a facile access to y-arylated ketones in generally good to excellent yields.This transformation is also characterized by wide substrate scope and functional group compatibility,for example,methoxy,γ-dimethylamino,keto,ester,fluoro and TMS groups are well-tolerated during the reaction process.