Circularly Polarized Luminescence from Helically Chiral N,N,O,O‐Boron‐Chelated Dipyrromethenes

Helically chiral N,N,O,O‐boron chelated dipyrromethenes showed solution‐phase circularly polarized luminescence (CPL) in the red region of the visible spectrum (λ_em(max) from 621 to 663 nm). The parent dipyrromethene is desymmetrised through O chelation of boron by the 3,5‐ortho‐phenolic substituents, inducing a helical chirality in the fluorophore. The combination of high luminescence dissymmetry factors (|g_lum| up to 4.7 ×10^?3) and fluorescence quantum yields (Φ_F up to 0.73) gave exceptionally efficient circularly polarized red emission from these simple small organic fluorophores, enabling future application in CPL‐based bioimaging.     

Large-Scale Imaging on the Australian Synchrotron Imaging and Medical Beamline (IMBL)

If you ask the general public what they understand to be an “X-ray,” it is likely that most will think of X-ray images, usually taken in hospitals of broken bones. After the discovery of X-radiation in the last years of the nineteenth century, the use of X-rays for imaging (radiography) has made an impact on many aspects of life and industry. The term “radiography” is used loosely here since, strictly speaking, it applies to imaging with anything other than optical light. For the purpose of this article, assume that it means X-ray imaging.     

Energy storage： Materials and processes

<正>Recent years have seen a significant surge in energy storage research and development across the globe.This is due to a number of factors including the increasingly grave environmental concerns,increased energy consumption,rising fuel prices,limited fossil fuel resources and the growing interest in the expansion of renewable     

In-silico guided discovery of novel CCR9 antagonists

Antagonism of CCR9 is a promising mechanism for treatment of inflammatory bowel disease, including ulcerative colitis and Crohn’s disease. There is limited experimental data on CCR9 and its ligands, complicating efforts to identify new small molecule antagonists. We present here results of a successful virtual screening and rational hit-to-lead campaign that led to the discovery and initial optimization of novel CCR9 antagonists. This work uses a novel data fusion strategy to integrate the output of multiple computational tools, such as 2D similarity search, shape similarity, pharmacophore searching, and molecular docking, as well as the identification and incorporation of privileged chemokine fragments. The application of various ranking strategies, which combined consensus and parallel selection methods to achieve a balance of enrichment and novelty, resulted in 198 virtual screening hits in total, with an overall hit rate of 18%. Several hits were developed into early leads through targeted synthesis and purchase of analogs.     

Study of a confined hydrogen‐like atom by the asymptotic iteration method

The asymptotic iteration method (AIM) is used to obtain both special exact solutions and general approximate solutions for a Hydrogen‐like atom confined in a spherical box of arbitrary radius R. Critical box radii, at which states are no longer bound, are also calculated. The results are compared with those in the literature. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 2009     

Presentations of some 3-transposition groups

We classify all 3-transposition groups which are generated by at most five of their 3-transpositions. Modulo a center these are 27 specific groups plus various quotients of a particular group of order 2(3⁴⁹). For each of the 27 groups at least one presentation is given. We also give presentations for many groups of importance in the recent classification of 3-transposition groups with trivial center. Our presentations include ones for the three sporadic 3-transposition groups of Fischer, each on a 3-transposition generating set of minimal size.