Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionControlling β-Sheet Assembly in Genetically Engineered Silk by Enzymatic Phosphorylation/Dephosphorylation, byS. Winkler, D. Wilson, and D. L. KaplanCite this: Biochemistry 2000, 39, 45, 14002Publication Date (Web):October 2…
The synthesis, crystal structure, magnetic properties, and Mössbauer spectra of [Fe(bpb)2(NCS)2]·0.5CH3OH (1) (bpb = 1,4-bis(4-pyridyl)-butadiyne) are reported. 1 is a singular example of the interpenetration of three mutually perpendicular nets with spin crossover properties.
In this paper, we describe the synthesis of novel amphoteric azopyridine carboxylic acids ( 2b, 3a, 3b, 4a, and 4b ), having both a carboxyl group as a hydrogen donor and a pyridyl group as an acceptor at each molecular terminus, and their self-organization, which is markedly affected by external stimuli including hea…
The novel title compound {NiII4MoV12} demonstrates the concept of generating targeted spin topologies using reduced polyoxometalates: The four electrophilic nickel centersforming a tetrahedronare fixed by a nucleophilic highly reduced diamagnetic ε-Keggin cluster of Td symmetry generated in solution. This cluster not…
The pore surface of MCM-48 mesoporous silica was functionalized with tungsten and molybdenum metal centers by the anhydrous reaction of metal alkoxides with surface silanol groups. Resulting metal−oxo species were attached via covalent M−O−Si bonds as confirmed with photoacoustic (PAS)-FTIR. Diffuse reflectance UV−vis…
The atomic force microscope (AFM) was used to directly measure the forces of interaction between E. coli D21 bacteria and hydrophilic glass or hydrophobic N -octadecyltrichlorosilane (OTS)-treated glass substrates coated with the block copolymers, poly(ethylene glycol) (PEG)−lysine dendron or Pluronic F127 surfactant,…
Polypeptides containing azobenzene or spiropyran units attached to the macromolecules respond to light or dark conditions giving reversible variations of their structure. In this Account we provide a short overview of current research in the field and describe the most significant experimental examples of photorespons…
It is now appreciated that the relationships of proteins, particularly enzymes, within a protein superfamily can be understood not only in terms of their sequence similarities and three-dimensional structures but also by chemical threads that relate their functional attributes. The mechanistic ties among superfamily m…
The interactions between polystyrenesulfonate (PSS)/polyallylamine (PAH) multilayers with human serum albumin (HSA) were investigated by means of scanning angle reflectometry (SAR). We find that albumin adsorbs both on multilayers terminating with PSS (negatively charged) or PAH (positively charged) polyelectrolytes.…
The platinum(II) methyl cation [(N−N)Pt(CH 3 )(solv)] + BF 4 - (N−N = ArN C(Me)C(Me) NAr, Ar = 2,6-(CH 3 ) 2 C 6 H 3, solv = H 2 O ( 2a ) or TFE = CF 3 CH 2 OH ( 2b )) is prepared by treatment of (N−N)Pt(CH 3 ) 2 with 1 equiv of aqueous HBF 4 in TFE. Reaction of a mixture of 2a and 2b with benzene in TFE/H 2 O solutio…
The magnetic field effects on excitons in an InAs nano-ring are studied theoretically. By numerically diagonalizing the effective-mass Hamiltonian of the problem, which can be separated into terms in centre-of-mass and relative coordinates, we calculate the low-lying exciton energy levels and oscillator strengths as a…
A method was developed for measuring the capillary forces arising from microscopic pendular liquid bridges. Results are described for perfectly wetting bridges between spheres of equal and unequal radii. A comparison with the theoretical values calculated from a numerical integration of the Laplace−Young equation demo…
The wavelength corresponding to the extinction maximum, λ max, of the localized surface plasmon resonance (LSPR) of silver nanoparticle arrays fabricated by nanosphere lithography (NSL) can be systematically tuned from ∼400 nm to 6000 nm. Such spectral manipulation was achieved by using (1) precise lithographic contro…
Reactive Ion Etching is an effective method for etching of diamond films, in this paper, the influences of maskant, system pressure and the composition of reactive gas on the etch rate and etched surface of diamond were studied. A gas mixture of O<SUB>2</SUB> and Ar was used as the reactive agent, the concentration of…
Many bacteria have been found to synthesize a family of polyesters termed polyhydroxyalkanoate, abbreviated asPHA. Some interesting physical properties of PHAs such as piezoelectricity, non-linear optical activity, biocompatibility andbiodegradability offer promising applications in areas such as degradable packaging,…
Corrosion fatigue tests were performed in air saturated hot water to assess fatigue crack growth behavior of reactor pressure vessel steel at the LWR operating condition. The main test parameter was loading frequency. Crack growth rate was increased with decreasing frequency until a critical frequency. It was found th…
The gamma-subunit of citrate lyase (EC 4.1.3.6) contains the prosthetic group 2'-(5"-phosphoribosyl)-3'-dephospho-CoA and serves as an acyl carrier protein (ACP). We recently showed that in Escherichia coli the proteins CitG and CitX are essential for holo-ACP synthesis and provided evidence that CitG catalyzes the fo…
When electrons are subject to a potential with two incommensurate periods, translational invariance is lost, and no periodic band structure is expected. However, model calculations based on nearly free one-dimensional electrons and experimental results from high-resolution photoemission spectroscopy on a quasi-one-dim…
We present results from a Monte Carlo investigation of a simple bilayer model with geometrically frustrated interactions similar to those found in the mixed layer pnictide oxides $(Sr_{2}Mn_{3}Pn_{2}O_{2}, Pn=As,Sb).$ Our model is composed of two inequivalent square lattices with nearest neighbor intra- and interlayer…
We describe a lattice Boltzmann algorithm to simulate liquid crystal hydrodynamics. The equations of motion are written in terms of a tensor order parameter. This allows both the isotropic and the nematic phases to be considered. Backflow effects and the hydrodynamics of topological defects are naturally included in t…