Materials Literature
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Aliphatic polyesters prepared by ring-opening polymerization of lactones are now used worldwide as bioresorbable devices in surgery (orthopaedic devices, sutures, stents, tissue engineering, and adhesion barriers) and in pharmacology (control drug delivery). This review presents the various methods of the synthesis of…
Die selektive und permanente Titration von Protonen mit organischen Basen (2,6‐Di‐ tert ‐butylpyridin oder Pyridin) liefert ein genaues Maß für die Dispersion von Keggin‐Strukturen während der katalytischen Oxidation von Methanol. Die Titration ermöglicht die systematische Steuerung der Redox‐ und Säureeigenschaften v…
In the crystal structure of dihydroxydiphthalatotricobalt(II), [Co(3)(C(8)H(4)O(4))(2)(OH)(2)](n), two of the four independent Co atoms lie at special positions of site symmetry 2. The hydroxy groups link three Co atoms to form a pyramidal Co(3)O unit, and adjacent Co(3)O units are linked through the Co base atoms int…
The paper outlines some approaches that should be considered in the calculation of partition coefficients based on Langmuir, Freundlich and Linear isotherms. It was found that the Langmuir partition coefficient (K Lg ), whose calculation involved the maximal amount of lead (Pb) and zinc (Zn) adsorbed and their appropr…
Picture this: The simultaneous growth of many single grains of catalyst culminating in polymer particles can be observed by videomicroscopy, and single-grain kinetics can be studied. The gas-phase polymerization of ethylene on 40 particles was examined in an autoclave equipped with a glass window by automatic image pr…
The structure of a new synthetic compound, diammonium tetrahydroxydecaborate monohydrate, has been determined by single-crystal X-ray diffraction. It crystallizes in triclinic space group P-1 and all atoms occupy general sites. The title compound is composed of [B(10)O(15)(OH)(4)](4-) ions as the fundamental building…
The 6-methyl-2-(2-pyridyl)-benzimidazole (biz) ligand coordinates with the actinide species in solution, and the complexes display efficient intramolecular energy-transfer processes. The energy transfer in the Cm(III)-biz system proceeds in a nonradiative mode, whereas a radiative mode is the principal mechanism in th…
Lightly cross-linked, swellable poly(divinylbenzene- alt -maleic anhydride) microgels were allowed to self-assemble at the oil−water interfaces of a propyl acetate−water suspension and covalently fixed in place using polyamines to form novel, flexible microgel capsules. The capsule wall morphology was studied by optic…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHierarchical Order in a Side-Group Liquid Crystalline Block CopolymerI. A. Ansari, V. Castelletto, T. Mykhaylyk, I. W. Hamley, Z. B. Lu, T. Itoh, and C. T. ImrieView Author Information Department of Chemistry, University of Leeds, Leeds LS2 9JT, UK Department of Chemistry, Univ…
Kinetic modeling of catalytic combustion of ethyl acetate and benzene over Cr-ZSM-5 (Si/Al = 240) is reported. Ethyl acetate was more reactive than benzene and could suppress benzene conversion in the binary mixture while water vapor retarded the conversion of both organics. Kinetic data obtained in the differential r…
BtuB is a bacterial outer-membrane protein that transports vitamin B(12). Spectroscopic studies using site-directed spin labeling (SDSL) indicate that the N-terminus of BtuB undergoes a dramatic structural change from a docked (folded) to an undocked (unfolded) configuration upon substrate binding. However, this drama…
The selective and permanent titration of protons with organic bases (2,6‐di‐ tert ‐butylpyridine or pyridine) provides an accurate measure of the dispersion of Keggin structures during catalytic oxidation of methanol. Titration allows the systematic control of the redox and acid properties of H 3+ n PV n Mo 12− n O 40…
A novel method for transferring silver nanoparticles from aqueous solution into organic solvents such as toluene or hexane was developed. Phase-transfer reagent, tri- n -octylphosphine oxide, TOPO, provides a capping shell around Ag particles that enables concentrating nanoparticle dispersion in toluene, which is a pr…
The crystal structures of bovine pancreatic ribonuclease A (RNase A) in complex with 3',5'-ADP, 2',5'-ADP, 5'-ADP, U-2'-p and U-3'-p have been determined at high resolution. The structures reveal that each inhibitor binds differently in the RNase A active site by anchoring a phosphate group in subsite P1. The most pot…
A unique epitaxial growth method, reactive solid-phase epitaxy, was used to fabricate heteroepitaxial thin films of LaCuOS, a transparent p-type semiconductor with layered structure. The epitaxial growth mechanism is examined through microscopic observations. A thin metallic Cu layer deposited between the amorphous La…
Hydrocalumite, Ca 2 Al(OH) 6 (anion)· n H 2 O, belongs to the layered double-hydroxide family, with the particularity for both intralayered cations and interlayered anions and water molecules to be well-ordered. The monomer vinyl benzene sulfonate (VBS) and the syndiotactic polymer poly(styrene sulfonate) (PSS) were r…
The crystal structures of lactose repressor protein (LacI) provide static endpoint views of the allosteric transition between DNA- and IPTG-bound states. To obtain an atom-by-atom description of the pathway between these two conformations, motions were simulated with targeted molecular dynamics (TMD). Strikingly, this…
Aqueous phase catalytic oxidation of ammonia has been studied over Ru/TiO2 catalyst in a batch reactor by changing the solution pH, concentration of catalyst in the solution, temperature, and reaction time. The oxidation reaction of ammonia over Ru/TiO2 catalyst has been found to take place exclusively for the aqueous…
A new approach for the formation of bimetallic coordination complexes of bismuth containing a 1:1 ratio of the two metal species has been developed. The strategy exploits the Lewis acidic nature of bismuth and has been used to synthesize the new complexes BiV(O)(Hsal)(sal)(salen*)·CH 2 Cl 2 ( 1 ), BiCu(Hsal) 3 (salen)…
The incorporation of tetravalent cations (Zr 4+ and Sn 4+ ) inside sheets of layered double hydroxide (LDH) was reported by Velu et al. As no local structural information was provided so far, the question here is whether the LDH structure may accommodate such a presence. From three different systems presenting the cat…