Materials Literature
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Synthesis and anionic ring-opening polymerization of l -serine (Ser)- and l -threonine (Thr)-based cyclic carbonates, (2-oxo[1,3]dioxan-5-yl)carbamic acid benzyl ester (Z-S-CC), (4-methyl-2-oxo[1,3]dioxan-5-yl)carbamic acid benzyl ester (Z-T-CC), and (4-methyl-2-oxo[1,3]dioxan-5-yl)carbamic acid tert -butyl ester (Boc…
Here we describe the large-scale domain movements and hydration structure changes in the active-site cleft of unligated glutamate dehydrogenase. Glutamate dehydrogenase from Thermococcus profundus is composed of six identical subunits of M(r) 46K, each with two distinct domains of roughly equal size separated by a lar…
Dispersed fluorescence studies of the diatomic molecules MoC, RuC, and PdC are reported. New states identified in MoC and RuC are the […]2δ112σ1, 3,1Δ2 states and the […]2δ312σ1, 1Δ2 state, respectively. Five states are observed by dispersed fluorescence in PdC. The ground state is found to be […]2δ412σ2, 1Σ+, with th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLeft or Right, It Is a Matter of One Methylene UnitChristopher Y. Li, Stephen Z. D. Cheng, Xin Weng, Jason J. Ge, Feng Bai, John Z. Zhang, Bret H. Calhoun, Frank W. Harris, Liang-Chy Chien, and Bernard LotzView Author Information The Maurice Morton Institute and Depart…
To examine the nature of criticality in ionic fluids we have analyzed experimental liquid–liquid coexistence and susceptibility data for various ionic solutions. We show that ionic fluids generally exhibit crossover or, at least, a tendency to crossover from Ising behavior asymptotically close to the critical point to…
Two new copper 2-pyrazinecarboxylate (2-pzc) coordination polymers incorporating [Mo(8)O(26)](4-) and [V(10)O(28)H(4)](2-) anions were synthesized and structurally characterized: Cu(4)(2-pzc)(4))(H(2)O)(8)(Mo(8)O(26)).2H(2)O (1) and Cu(3)(2-pzc)(4)(H(2)O)(2)(V(10)O(28)H(4)).6.5H(2)O (2). Crystal data: 1, monoclinic, s…
Thirty-two molecular beads are threaded onto the terminal groups of a fourth-generation dendrimer (see picture). These pseudorotaxane-terminated dendrimers not only constitute a new class of topologically intriguing molecules but also provide a novel way of modifying dendrimer exteriors by noncovalent interactions.
As a hybrid of two aryl motifs, that is p-anisyl and mesityl, the 4-methoxy-2,6-dimethylphenyl or “manisyl” substituent offers possibilities for both further structural elaboration as well as enhancing the solubility of the heterocyclic ligands mentioned in the title. A highlight of this work lies in the ability of th…
Highly branched poly(methyl methacrylate) with an estimated degree of branching = 0.074 (i.e., 3.7 branchpoints per 100 monomer units) was prepared using self-condensing group transfer copolymerization (SCVCP) of methyl methacrylate (MMA) and 2-(2-methyl-1-triethylsiloxy-1-propenyloxy)ethyl methacrylate (MTSHEMA) and…
A quantitative analysis of Si29 nuclear magnetic resonance spectra of radiation damaged, natural zircons showed that the local structure in crystalline and amorphous regions depend explicitly on radiation dose. Nonpercolating amorphous islands of high density “glass” within the crystalline matrix show a low interconne…
Short block copolymers in a selective solvent (bad for A-block, good for B-block) are modeled by flexible bead−spring chains, where beads interact with short-range Morse potentials of variable strength. In particular, treating the strength E AA of attraction between monomers of the A-block as a variable, we study the…
The polarization reversal process of tetragonal Pb(Zr,Ti)O3 thin films has been intensively studied using conventional hysteresis and rectangle pulse measurements. Decreasing the voltage level of the pulses significantly slows down the polarization switching to the range of milliseconds. The switching current response…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLanthanide Tags for Time-Resolved Luminescence Microscopy Displaying Improved Stability and Optical PropertiesLoïc Charbonnière, Raymond Ziessel, Massimo Guardigli, Aldo Roda, Nanda Sabbatini, and Michèle CesarioView Author Information Laboratoire de Chimie d'Electroni…
Given the intrinsic relation between phase behavior and performance in applications involving polymer mixtures, the thermodynamics of these systems has been the common focus of a wide body of experimental and theoretical studies. An elusive goal in this research field has been the ability to predict or simulate the de…
For a general spin dimer that has different numbers of unpaired electrons at the two spin sites, we examined the relationship between the spin exchange parameter J and the energy difference between the broken-symmetry and highest-spin states of the spin dimer on the basis of the spin-Hamiltonian Ĥ=−JŜ1⋅Ŝ2. The resulti…
A molecular-dynamics thermal annealing model is proposed to investigate the mechanisms involved in picosecond pulsed laser ablation of crystalline silicon. In accordance with the thermal annealing model, a detailed description of the microscopic processes which result from the interaction of a 308 nm, 10 ps, Gaussian…
The dispersion relations of the surface polaritons of a slab made of a material which has dispersive permittivity and permeability, and is left-handed over a frequency band in the microwave range of several GHz, are investigated. Four branches of p polarized surface polaritons and two branches of s polarized ones are…
NiO in association with aluminum oxide has been identified by temperature-programmed reduction as the active species in the Ni–Al hydrotalcite catalyst that oxidizes α-ketols as well as benzylic and allylic alcohols to their corresponding carbonyl compounds in oxygen in quantitative yields under mild reaction conditio…
To the Editor: Various vascular grafts are commonly used in the reconstruction of cardiovascular tissues. However, prosthetic or bioprosthetic materials lack growth potential and therefore in child...
The Gilroy-Phillips model of relaxational jumps in asymmetric double-well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, the $\ensuremath{\alpha}$ process. The extension requires t…