Mitochondria-targeted fluorescent probe based on vibration-induced emission for real-time monitoring mitophagy-specific viscosity dynamic

Directly monitoring mitophagy-specific viscosity dynamic in living cells is of great significance but remains challenging. Herein, this study reported a novel mitochondria-targeted fluorescent probe DPAC-DY based on vibration-induced emission (VIE) for monitoring viscosity changes during mitochondrial autophagy. This probe contained N,N'-diphenyl- dihydrodibenzo[a,c]phenazine (DPAC) as the VIE core and two positively charged pyridinium moieties for mitochondria anchoring. As the ambient viscosity increased, the vibration of DPAC-DY could be hindered, and subsequently resulting in the enhancement of fluorescence emission. In vitro and intracellular experiments indicated that the probe DPAC-DY showed highly sensitive response to viscosity due to VIE mechanism. Importantly, by virtue of this probe, in situ and real-time visualization of the specific viscosity dynamics during the mitochondrial autophagy process was achieved. Thus, this work provides a novel strategy for VIE-based viscosity response sensors applied to specific organelles and offers a platform for in-depth study of mitochondrial viscosity-related diseases.     

几类亚纯双单叶函数的系数估计

研究了几类亚纯双单叶函数的系数估计,所得结果改进或推广了部分作者的结论.     

由拟从属定义的单叶函数的逆在$k$次根变换下的Fekete-Szego问题

本文在逆函数$n$次根变换的条件下,利用拟从属定义了一个单叶解析函数类,估计了它的Fekete-Szeg\"o泛函.     

Na(Y1.5Na0.5)F6:Yb3+/Er3+纳米棒的制备及其上转换发光特性

采用水热合成法,使用油酸作为乳化剂制备了Yb3+/Er3+共掺杂六角相Na(Y1.5Na0.5)F6纳米棒。通过X射线衍射(XRD)、扫描电子显微镜(SEM)以及荧光光谱等测试手段对所制备的样品进行表征。测试结果表明,Na(Y1.5Na0.5)F6纳米晶的晶格常数为a=b=0.600 nm,c=0.352 nm。在980 nm红外光激发下,Yb3+/Er3+共掺杂Na(Y1.5Na0.5)F6纳米棒发出从红光到近紫外的上转换荧光,其中红光、绿光和近紫外光分别对应于Er3+离子4F9/2→4I15/2,(2H11/2,4S3/2)→4I15/2和(2G11/2/2H9/2)→4I15/2的能级跃迁。详细讨论和分析了各荧光波段的上转换发射过程。     

关于三角范畴的八面体公理

三角范畴是一个带有自同构且满足四条公理的加法范畴,其中的一条重要公理就是八面体公理,该公理形式复杂不易理解难以应用.在本文中,作者讨论了三角范畴定义中八面体公理的几个等价命题,给出了新的八面体公理的等价命题,证明了各个公理间的相互等价关系,同时简化了八面体的表达形式,并且给出了该定理的一个具体应用.     

一类由从属关系定义的m-折对称双单叶函数的系数估计及Fekte-Szego不等式

本文研究了一类由从属关系定义的$m$-折对称双单叶函数的系数估计及Fekte-Szego不等式,所得结果改进或推广了已有部分作者的结论.     

与正弦函数有关的星形函数逆的Toeplitz行列式

Let S_s*be the class of normalized functions f defined in the open unit■such that the quantity zf’(z)/f(z)lies in an eight-shaped region in the right-half plane and satisfies the condition■.In this paper,we aim to investigate Toeplitz determinants for the inverse of this function classes S_s*associated with sine function.     

矩阵方程A1Z+ZB1=C1的广义自反最佳逼近解的迭代算法

本文研究了Sylvester复矩阵方程A_1Z+ZB_1=c_1的广义自反最佳逼近解.利用复合最速下降法,提出了一种的迭代算法.不论矩阵方程A_1Z+ZB_1=C_1是否相容,对于任给初始广义自反矩阵Z_0,该算法都可以计算出其广义自反的最佳逼近解.最后,通过两个数值例子,验证了该算法的可行性.     

Prop erties for Certain Sub classes of Analytic Functions Asso ciated with Generalized Multiplier Transformation

In this paper, we introduce certain new subclasses of analytic functions defined by generalized multiplier transformation. By using the differential subordination, we study and investigate various inclusion properties of these classes. Also inclusion properties of these classes involving the integral operator are considered.     

Design and synthesis of an AIE-active fluorogen with red emission and its biological application

A novel triphenylamine-base derivative L containing pyridine and terpyridine was designed and synthesized. Compound L exhibited distinct aggregation-induced emission (AIE) behavior in water–ethanol and also displayed a threefold increase in the intensity of luminescence at 608 nm. Furthermore, confocal microscopy imaging demonstrated that compound L displays low toxicity and brights red fluorescence in mitochondria in living HepG2 cells. Inherent from the mitochondrial-targeting ability of pyridine moiety and the AIE characteristic of triphenylamine group, compound L could be employed as a fluorescent probe in the near-infrared region for living cell imaging.