A High‐Performance Supercapacitor Based on KOH Activated 1D C70 Microstructures

Fullerenes are of tremendous interest from fundamental researches to applied perspectives in the past decades. However, their application in supercapacitors has been underdeveloped for a long time. Here, the KOH activation of C₇₀ microtubes is reported at high temperatures, which provides activated samples exhibiting excellent capacitive properties. The improved capacitive performance can be attributed to three aspects: the generation of macropores and micropores, the introduction of oxygen functionalities, and the formation of graphitic carbons from ellipsoidal fullerenes. The optimum activated state for supercapacitor application is achieved at 600 °C, at which the product exhibits the best electrochemical behavior with a gravimetric capacitance of 362.0 F g^?1 at 0.1 A g^?1 and excellent cycling stability with capacitance retention of 92.5% over 5000 cycles at 1 A g^?1.     

Analysis of colorectal cancer glyco‐secretome identifies laminin β‐1 (LAMB1) as a potential serological biomarker for colorectal cancer

The high mortality rate in colorectal cancer is mostly ascribed to metastasis, but the only clinical biomarker available for disease monitoring and prognosis is the carcinoembryonic antigen (CEA). However, the prognostic utility of CEA remains controversial. In an effort to identify novel biomarkers that could be potentially translated for clinical use, we collected the secretomes from the colon adenocarcinoma cell line HCT‐116 and its metastatic derivative, E1, using the hollow fiber culture system, and utilized the multilectin affinity chromatography approach to enrich for the secreted glycoproteins (glyco‐secretome). The HCT‐116 and E1 glyco‐secretomes were compared using the label‐free quantitative SWATH‐MS technology, and a total of 149 glycoproteins were differentially secreted in E1 cells. Among these glycoproteins, laminin β‐1 (LAMB1), a glycoprotein not previously known to be secreted in colorectal cancer cells, was observed to be oversecreted in E1 cells. In addition, we showed that LAMB1 levels were significantly higher in colorectal cancer patient serum samples as compared to healthy controls when measured using ELISA. ROC analyses indicated that LAMB1 performed better than CEA at discriminating between colorectal cancer patients from controls. Moreover, the diagnostic performance was further improved when LAMB1 was used in combination with CEA.     

化脓链球菌中野生型和突变体FtsB蛋白的铁色素结合特性

目的:进一步比较化脓链球菌中野生型和Y137A、W204A突变型FtsB蛋白的铁色素结合特性,确定铁色素结合位点。方法:制备野生型和Y137A、W204A突变型FtsB蛋白,采用ICP-MS和ITC比较其铁色素结合能力;Na2SO4还原实验比较铁色素的还原速率;CD热变性和盐酸胍化学变性实验比较其铁色素结合稳定性。结果:Y137A、W204A突变型FtsB蛋白的铁色素结合能力和结合稳定性均低于野生型蛋白,铁色素的还原速率均高于野生型蛋白,可见Tyr137和Trp204是FtsB蛋白重要的铁色素结合位点。结论:进一步确定了Tyr137和Trp204氨基酸残基在FtsB与铁色素结合中的重要作用,为深入研究细菌中的铁色素转运机理及开发疫苗候选物奠定了一定的理论基础。     

向日葵ACC氧化酶基因(HaACO1)的克隆及表达分析

目的:克隆向日葵中的ACC氧化酶基因(HaACO1),并对其进行生物信息学分析及盐胁迫表达分析,为理解向日葵ACC氧化酶生理功能并加强对ACO基因的利用奠定基础。方法:以前期从盐胁迫的内葵杂4号根中获得的ACC氧化酶基因片段4-4-7TDF(KM823963)为基础,通过RT-PCR和5'/3'RACE技术克隆ACO基因的全长cDNA序列,利用生物信息学软件对获得的cDNA序列及编码的蛋白质序列进行分析。同时采用PCR方法克隆基因组DNA(genemic DNA,gDNA)序列,并对其进行结构分析。利用实时荧光定量PCR分析Na Cl胁迫下向日葵根、下胚轴、叶中HaACO1的表达量和不同NaCl浓度及不同胁迫时间下根中Ha ACO1的表达量。结果:Ha ACO1的cDNA序列全长为1 135bp,其开放阅读框为942bp,编码313个氨基酸。预测其分子质量和等电点分别为35.84k Da和5.13,基因登录号为KP966508。HaACO1与已报道的多种植物的ACO基因核苷酸序列及其推导的氨基酸序列有较高的相似性,分别为76%~83%和77%~88%。gDNA起始密码子至终止密码子序列长1 018bp,包含2个外显子和1个内含子,基因登录号为KP988289。实时荧光定量PCR分析表明向日葵HaACO1在不同器官及不同NaCl浓度、不同时间诱导下存在特异性表达差异。结论:获得的向日葵HaACO1是植物ACO家族成员之一,该基因应答盐胁迫具有独特的表达模式。