Iron-facilitated direct oxidative C-H transformation of allylarenes or alkenes to alkenyl nitriles

This paper describes the first direct approach to alkenyl nitriles from allylarenes or alkenes facilitated by an inexpensive homogeneous iron catalyst. Three C-H bond cleavages occur under the mild conditions during this process. Mechanistic studies indicate that the cleavage of the allyl C(sp(3))-H bond is involved in the rate-determining step. This observation may provide an opportunity to achieve C(sp(3))-H functionalization catalyzed by an iron catalyst.     

Spin Squeezing of the Two Two-Level Atoms Interacting with a Binomial Field

Spin squeezing of the two two-level atoms interacting with a binomial field has been investigated with the different initial conditions. It is shown that spin squeezing can be exhibited in the certain range of p and the degree of squeezing is dependent on p.     

Polylysine-modified polyethylenimines as siRNA carriers for effective tumor treatment

Polyethylenimine-poly(L-lysine)(PEI-PLL) copolymer was synthesized via ring-opening polymerization of L-lysine N-carboxyanhydride(Lys(Z)-NCA) initiated by PEI. The complexation of PEI-PLL with si RNA was studied by particle size and zeta potential measurements. The flow cytometric analysis and confocal imaging showed its excellent intracellular trafficking ability. PEI-PLL displayed higher gene silencing efficiency and lower cytotoxicity than commercial PEI-25 k in vitro. In the antitumor study, PEI-PLL was further combined with si VEGF and showed obviously tumor inhibition effect for the treatment of CT26 tumor model. Therefore, PEI-PLL is a promising si RNA carrier candidate for further antitumor treatment in vivo.     

A dual-mode biosensor for salivary cortisol with antibody-aptamer sandwich pattern and enzyme catalytic amplification

Journal of Solid State Electrochemistry - A split-type and dual-mode (photoelectrochemical and electrochemical, PEC and EC) biosensor was developed for non-invasive and sensitive detection of...     

Solvent-derived Fluorinated Secondary Interphase for Reversible Zn-graphite Dual-ion Batteries

The irreversibility of anion intercalation-deintercalation is a fundamental issue in determining the cycling stability of a dual-ion battery (DIB). In this work, we demonstrate that using a partially fluorinated carbonate solvent can drive a beneficial fluorinated secondary interphase layer formation. Such layer facilitates reversible anion (de−)intercalation processes by impeding solvent molecule co-intercalation and the associated graphite exfoliation. The enhanced reversibility of anion transport contributes to the overall cycling stability for a Zn-graphite DIB—a high Coulombic efficiency of 98.5 % after 800 cycles, with an attractive discharge capacity of 156 mAh g⁻¹ and a mid-point discharge voltage of ≈1.7 V (at 0.1 A g⁻¹). In addition, the formed fluorinated secondary interphase suppresses the self-discharge behavior, preserving 29 times of the capacity retention rate compared to the battery with a commonly used carbonate solvent, after standing for 24 hours. This work provides a simple and effective strategy for addressing the critical challenges in graphite-based DIBs and contributes to fundamental understanding to help accelerate their practical application.     

A modified walk-on-sphere method for high dimensional fractional Poisson equation

We develop walk-on-sphere method for fractional Poisson equations with Dirichilet boundary conditions in high dimensions. The walk-on-sphere method is based on probabilistic representation of the fractional Poisson equation. We propose efficient quadrature rules to evaluate integral representation in the ball and apply rejection sampling method to drawing from the computed probabilities in general domains. Moreover, we provide an estimate of the number of walks in the mean value for the method when the domain is a ball. We show that the number of walks is increasing in the fractional order and the distance of the starting point to the origin. We also give the relationship between the Green function of fractional Laplace equation and that of the classical Laplace equation. Numerical results for problems in 2–10 dimensions verify our theory and the efficiency of the modified walk-on-sphere method.     

Dynamical behaviors of a delayed chemostat model with impulsive diffusion on nutrients

In this paper, a chemostat model with delayed response in growth and impulsive diffusion on nutrients is considered. Using the discrete dynamical system determined by the stroboscopic map, we obtain a microorganism-extinction periodic solution. Further, it is globally attractive. The permanent condition of the investigated system is also obtained by the theory on impulsive delay differential equation. Our results reveal that the impulsive diffusion amount plays an important role on the outcome of the chemostat. Finally, the numerical analysis is inserted to illustrate the results.     

Hybrid co-based MOF nanoboxes/CNFs interlayer as microreactors for polysulfides-trapping in lithium-sulfur batteries

Lithium-sulfur battery is desirable for the future potential electrochemical energy storage device with advantages of high theoretical energy density,low cost a...     

Hierarchical N-doped porous carbon hosts for stabilizing tellurium in promoting Al-Te batteries

Aluminum batteries are attractive in electrochemical energy storage due to high energy density and low-cost aluminum,while the energy density is limited for the...