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。
An effective and facile method for the fabrication of a surface-enhanced Raman scattering (SERS)-active film with closely packed gold nanoparticle (AuNP) arrays is proposed by self-assembly of different sizes (16, 25, 40 and 70 nm) of AuNPs at a toluene/water interface with ethanol as the inducer. The as-prepared AuNP…
The characterization of a new five-coordinate derivative of (2-methylimidazole)(tetraphenylporphinato)iron(II) provides new and unique information about the effects of forming a hydrogen bond to the coordinated imidazole on the geometric and electronic structure of iron in these species. The complex studied has two cr…
The glass transition and thermodynamics of spherical liquid TiO(2) nanoparticles, with different sizes ranging from 2 to 5 nm, have been studied in a model under non-periodic boundary conditions. We use the pairwise interatomic potentials proposed by Matsui and Akaogi. Models have been obtained by cooling from the mel…
The solubility of stearic acid was measured in ethanol, 2-propanol, heptane, hexane, acetone, and trichloroethylene and in the azeotropic mixtures of the solvents (ethanol−heptane; hexane−ethanol; ethanol−trichloroethylene; acetone−heptane; heptane−2-propanol; acetone−hexane; hexane−2-propanol; 2-propanol−trichloroeth…
The dielectric permittivity (100 Hz–1 MHz) and IR reflectivity of SrTiO 3 :Mn(0.1 at.%) crystals and SrTiO 3 :Mn(0.1–3 at.%) ceramics prepared maintaining the ratio (Sr+Mn)/ Ti = 1 or (Ti+Mn)/Sr = 1 (A- and B-type ceramics, respectively) were studied. Surprisingly, the magnitude and ε ′ ( T ) dependence for the crysta…
AIM: To boost short-chain-length-long-chain-length polyhydroxyalkanoate (SCL-LCL-PHA) co-polymer yield in Pseudomonas aeruginosa MTCC 7925 by manipulating culture conditions. METHODS AND RESULTS: Stationary phase culture of P. aeruginosa MTCC 7925 was subjected to various doses of different carbons and, N and P defici…
A novel family of transcription factors responsible for regulation of various aspects of NAD synthesis in a broad range of bacteria was identified by comparative genomics approach. Regulators of this family (here termed NrtR for Nudix-related transcriptional regulators), currently annotated as ADP-ribose pyrophosphata…
The temperature dependence of magnetization, magnetic anisotropy, and coercive field of gallium-substituted cobalt ferrite was investigated for a series of compositions of CoGaxFe2−xO4 (0⩽x⩽0.8). Hysteresis loops were measured for each sample over the range of −5T⩽μ0H⩽5T for selected temperatures between 10 and 400K.…
The extremely stable conductivity against molecular physisorptions was revealed in thin films of high-purity metallic single wall carbon nanotubes (SWCNTs). The stability of the metallic SWCNTs results from their constant electronic density of state near the Fermi level. In the case of a mixture of metallic and semico…
The results on the synthesis and characterization of highly monodisperse Fe-doped ZnO nanocrystals are presented. Stable suspensions of these materials were produced in an ethanol solution at room temperature. To promote crystal growth, the suspensions of nanocrystals were aged in contact with their mother liquors. X-…
A comparative genomic approach was used to reconstruct transcriptional regulation of NAD biosynthesis in bacteria containing orthologs of Bacillus subtilis gene yrxA, a previously identified niacin-responsive repressor of NAD de novo synthesis. Members of YrxA family (re-named here NiaR) are broadly conserved in the B…
The magnetoelectric effect of chromium sesquioxide ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}$ has been determined experimentally as a function of temperature. One measures the electric field-induced magnetization on ${\mathrm{Cr}}_{2}{\mathrm{O}}_{3}$ crystals or the magnetic field-induced polarization. From the magnetoelect…
The site preference of 3d atoms Y in Mn 2 Y Al ( Y = V, Fe, Co) alloys and its influence on their electronic structures and magnetism have been studied by first-principles calculations. The results prove that elements with more valence electrons than Mn tend to enter the A (0, 0, 0) and C (½, ½, ½) sites and elements…
We investigate the conductance spectra of a normal-superconductor graphene junction using the extended Blonder-Tinkham-Klapwijk formalism, considering pairing potentials that are both conventional (isotropic $s$-wave) and unconventional (anisotropic $d$-wave). In particular, we study the full crossover from normal to…
This paper reviews the properties of aqueous foams. The current state of knowledge is summarized briefly and the interdisciplinary aspects of this field of investigation are emphasized. Many phenomena are controlled by physical laws, but they are highly dependent upon the chemicals used as foam stabilizers: surfactant…
A series of benzobis(imidazolium) (BBI) salts has been prepared and studied as a new class of versatile fluorescent materials. Using a high yielding, modular synthetic strategy, BBI salts with a range of functionality poised for investigating fundamental and applications-oriented characteristics, including emission wa…
We report on structural properties of PEO−PPO−PEO type of triblock block copolymers (Pluronics F127) with special emphasis on the effect of diblock PEO−PPO impurities on the ordered gel phase. Commercial F127 polymers contain as received roughly 20% PEO−PPO diblock and 80% PEO−PPO−PEO triblock copolymers. Aqueous solu…
Chitosan was chemically modified to produce quaternary ammonium salts in order to improve its antimicrobial activity and physicochemical properties. Quaternization of N-alkyl chitosan derivatives was carried out using alkyl iodide to elaborate water-soluble cationic polyelectrolytes ( N, N, N-trimethylchitosan, TMC).…
Collagen is the most abundant protein in animals, including humans. The prevalent (2 S,4 R )-4-hydroxyproline (Hyp) residues of collagen are known to confer great stability upon its triple-helical conformation. The basis for that stability has been attributed to hydration of the pendant hydroxyl groups. Here, that att…
We report selection and characterization of hydroxyapatite-binding heptapeptides from a peptide-phage library and demonstrate the effects of two peptides, with different binding affinities and structural properties, on the mineralization of calcium phosphate mineral. In vitro mineralization studies carried out using o…