Sol-Gel and Isotropic-Nematic Transitions in Aqueous Suspensions of Natural Nontronite Clay. Influence of Particle Anisotropy. 2. Gel Structure and Mechanical Properties.

International audienc

Retail Gravitation and Economic Impact: A Market-Driven Analytical Framework for Bike-Share Station Location Analysis in the United States

Bike-share programs are becoming a more frequent and popular amenity for cities around the world. Current analytical models for optimizing the placement and location of bike-share stations seem underdeveloped and potentially subject to false calibration errors. This research builds on retail gravitation models and their derivates to develop a duplicable model for bike-share location in cities in the United States. The findings suggest retail gravitation theory is helpful to bike-share station location analysis. Additionally, the findings set a framework for other cities to use as well as identify future research

Taking Toll: The Impact of Sexual and Gender Harassment in the Lives of Middle and High School Students

Middle school and high school are difficult spaces traversed by adolescents. Caught up in the midst of one of the most challenging developmental stages of life, adolescents are simultaneously trying to individuate from others (parents and peers), while trying to fit in with peers and the larger social context. There are many adults who fondly reminisce about their high school days, recalling that time as happy and hope-filled. But, for many young people, those days are anything but care-free. Many students experience sexual and/or gender harassment during their middle and high school years

Trustworthiness, Governance, and Wealth Creation

trustworthiness, governance, wealth creation, competitive advantage, trust, distrust, commitment,

Tri-, Tetra-, and Hexanuclear Copper(II) Phosphonates Containing N-Donor Chelating Ligands: Synthesis, Structure, Magnetic Properties, and Nuclease Activity

Reaction of Cu(ClO4)2 3 6H2O with cyclopentyl phosphonic acid and 2,20-bipyridine (bpy) in presence of triethylamine afforded a trinuclear compound [Cu3(C5H9PO3)2(bpy)3(MeOH)(H2O)](ClO4)2 (2). The latter dimerizes to a hexanuclear derivative [Cu6(C5H9PO3)4(bpy)6(MeOH)4](ClO4)4 (1) under prolonged reaction conditions. Reaction of CuCl2 with cyclopentyl phosphonic acid and 2,20-bipyridylamine (bpya) affords a tetranuclear derivative [Cu4(C5H9PO3)2( μ-Cl)2(bpya)4](Cl)2, (MeOH)2 (3). Reaction of the latter with NaClO4 also affords a trinuclear compound [Cu3(C5H9PO3)2( μ-Cl)(bpya)3(H2O)](ClO4) (4). Double and single-bridged hexanuclear species, [{Cu3(C5H9PO3)2(bpy)3(bpp)}(MeOH)2(H2O)(CH2Cl2)(ClO4)2]2 (5), [{Cu3(i- PrPO3)2(bpy)3(4.40-bpy)(H2O)}(H2O)2(ClO4)2]2 (6), [{Cu3(C5H9PO3)2(bpya)3(4.40-bpy)(H2O)}(MeOH)(H2O)(ClO4)2]2 (7), and [Cu6(t-BuPO3)4(phen)6(4,40-bpy)(MeOH)4](CH2Cl2)(H2O)(ClO4)4 (8) (phen = 1,10-phenanthroline) were obtained by the reaction of an in situ generated trinuclear complex with appropriate bridging ligands 4,40-bipyridine (4,40-bpy) or 1,3-bis(4- pyridyl)propane (bpp). ESI-MS studies of these complexes reveal that 2-4 retain their structures in solution. Molecular structures of 2-8 were determined by X-ray crystallography. All the compounds reveal a capping coordination mode by tridentate phosphonate [RPO3]2- ligands. Detailed magnetic studies on 2 and 4-8 reveal intramolecular antiferromagnetic interactions between Cu(II) S = 1/2 spins. 2 and 4 are excellent artificial nucleases and can convert supercoiled plasmid DNA (pBR322) into its nicked form without the aid of an external oxidant