Materials Literature
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Multimodal, biocompatible contrast agents for high magnetic field applications represent a new class of nanomaterials with significant potential for tracking of fluorescence and MR in vitro and vivo. Optimized for high-field MR applications-including biomedical imaging at 21.1 T, the highest magnetic field available f…
The lattice-dynamical properties of ${\text{LiGaO}}_{2}$ have been studied by means of first-principles density-functional calculations using the pseudopotential linear-response approach in the local-density approximation. For comparison, similar calculations are performed for the related materials ZnO and GaN. The qu…
Pyruvate formate-lyase-activating enzyme (PFL-AE) activates pyruvate formate-lyase (PFL) by generating a catalytically essential radical on Gly-734 of PFL. Crystal structures of unactivated PFL reveal that Gly-734 is buried 8 A from the surface of the protein in what we refer to here as the closed conformation of PFL.…
We propose an explanation for the electronic nematic state observed recently in parent iron-based superconductors [T.-M. Chuang, Science 327, 181 (2010)10.1126/science.1181083]. We argue that the quasi-one-dimensional nanostructure identified in the quasiparticle interference (QPI) is a consequence of the interplay of…
Human haematopoietic prostaglandin D synthase (H-PGDS; EC 5.3.99.2) produces prostaglandin D(2), an allergic and inflammatory mediator, in mast cells and Th2 cells. H-PGDS has been crystallized with novel inhibitors with half-maximal inhibitory concentrations (IC(50)) in the low nanomolar range by the counter-diffusio…
Annealing multilayers of gadolinium hydroxide lead to the growth of gadolinium oxychloride crystallites film through a two-dimensionally confined process. The employment of confined crystallization process create a multilayer film composed of mixed crystallites each doped with different activator ions, such as Eu3+ an…
Carbon nanotube is a promising material to fabricate high-performance nanoscale-optoelectronic devices owing to its unique 1-D structure. In particular, different types of carbon-nanotube-infrared detectors have been developed. However, most previous reported carbon-nanotube-IR detectors showed poor device characteris…
We show that the difficulty of cloaking is fundamentally limited by delay-loss and delay-bandwidth limitations that worsen as the size of the object to be cloaked increases relative to the wavelength, using a simple model of ground-plane cloaking. These limitations must be considered when scaling experimental cloaking…
Based on analysis of the structure and optical properties of Tl, Pb and Bi centres in crystals and comparison of their spectra with the near-IR luminescence spectra of bismuth-doped glasses, a model is proposed for the near-IR emitting bismuth centres in glass. Experimental evidence is presented in support of the mode…
In this study, adult human bone marrow-derived stromal cells (hBMSCs) were cultured in extracts of magnesium (Mg) and the Mg alloys AZ91D and NZ30K for 12 days. We studied the indirect effects of Mg alloys on hBMSC viability. Alkaline phosphatase activity and the expression of osteogenic differentiation marker genes w…
Five-fold twinned, starfish-like Rh nanocrystals consisting of five arms (see TEM) have been synthesized in high yields with the use of [{(CF3COO)2Rh}2] as a precursor to completely eliminate oxidative etching from this system. The as-prepared Rh nanocrystals were shown with great performance as a substrate for SERS.
Using the small molecule TEOP (5,10,15,20-[1,4-benzodioxane-6-carboxalde]porphyrin), the in situ assembly is a very convenient and efficient approach for fabricating high-quality ordered patterns. The well-ordered patterns possess strong saturated absorptive and self-defocusing nonlinearities while the TEOP solution e…
Cisplatin is a first line chemotherapy for most types of cancer. However, its use is dose-limited due to severe nephrotoxicity. Here we report the rational engineering of a novel nanoplatinate inspired by the mechanisms underlying cisplatin bioactivation. We engineered a novel polymer, glucosamine-functionalized polyi…
For over a century, x-ray scattering has been the most powerful tool for determining the equilibrium structure of crystalline materials. Deviations from perfect periodicity, for example due to thermal motion of the atoms, reduces the intensity of the Bragg peaks as well as produces structure in the diffuse scattering…
The puzzling electronic correlation effects in the sodium cobaltate system are studied by means of the combination of density functional theory and the rotationally invariant slave boson (RISB) method in a cellular-cluster approach. Realistic non-local correlations are hence described in the short-range regime for fin…
We present exact analytical solutions for the zero-energy modes of two-dimensional massless Dirac fermions fully confined within a smooth one-dimensional potential $V(x)=\ensuremath{-}\ensuremath{\alpha}/\text{cosh}(\ensuremath{\beta}x)$, which provides a good fit for potential profiles of existing top-gated graphene…
The impact of oxygen deficiency on physical properties of Na2/3CoO2-x has been investigated. From the combined thermogravimetric, magnetic susceptibility and synchrotron X-ray Laue diffraction studies, it is demonstrated that Na2/3CoO2 shows no superlattice ordering due to Na ions; however Na2/3CoO1.98, which has the…
This paper describes the low-temperature nuclear and magnetic structures of ${\text{La}}_{2}{\text{O}}_{2}{\text{Fe}}_{2}{\text{OSe}}_{2}$ by analysis of x-ray and neutron diffraction data. The material has been demonstrated to order antiferromagnetically at low temperatures, with ${T}_{\text{N}}=\ensuremath{\sim}90\t…
Colossal enhancement of magnetoresistance has been achieved over a broad temperature range which extends upto the room temperature, in ferromagnetic metal-charge ordered insulator manganite multi-layers. The artificially created phase coexistence in the multilayers reproduce the characteristic signatures of metastabil…
In this review, we provide an account of the recent progress in understanding electronic transport in disordered graphene systems. Starting from a theoretical description that emphasizes the role played by band structure properties and lattice symmetries, we describe the nature of disorder in these systems and its rel…