Materials Literature
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Lactivicin (LTV) is a natural non-beta-lactam antibiotic that inhibits penicillin-binding proteins and serine beta-lactamases. A crystal structure of a BS3-LTV complex reveals that, as for its reaction with PBPs, LTV reacts with the nucleophilic serine and that cycloserine and lactone rings of LTV are opened. This str…
We conducted dynamic viscoelastic and birefringence measurements for dynamically homogeneous mixtures, polystyrene (PS)/4-pentyl-4′-cyanobiphenyl (5CB), to examine the orientational coupling between PS segments and 5CB molecules. It was also investigated whether dynamic homogeneity was correlated with orientational co…
Abstract A review is given on the effect of neutron irradiation on the microstructure and properties of Zr–Nb and Zr–Nb–Fe (Sn,O) alloys. The in-reactor performance of Zr alloys is dependent on their composition and microstructure, and even small changes in the composition and processing lead to substantial changes in…
Highly stable eta(2)-porphyrin Ru(II) pi complexes have been synthesized. The formation of the eta(2) pi bond has been facilitated through pi-pi stacking interactions between the porphyrin and the planar ligand on Ru. pi coordination of ruthenium to porphyrin results in dramatic changes in the aromaticity and electron…
Nephrogenic systemic fibrosis (NSF) is a recently described, debilitating systemic disease most commonly seen in patients with renal insufficiency. Exposure to gadolinium-containing contrast agent has been associated with the onset of symptoms. The epidemiology, pathogenesis, clinical manifestation, diagnosis, histolo…
Introduction. Rhizopus stolonifer is the causal agent of Rhizopus rot disease in various fruit and vegetables. Materials and methods. The effect of chitosan was evaluated in vitro on mycelial growth, sporulation, morphological characteristics and germination of spores of three isolates of R. stolonifer (from peach, pa…
It is shown by microindentation that the defect structure of nanocrystalline titanium obtained by rolling at low temperature is quite uniform. The presence of texture was manifested as a small difference of the average values of the hardness H¯V and the standard deviation in the measurements in the roll plane and in a…
X-ray single crystal structure analysis has become a gold standard for the determination of molecular geometry. The reliability of the technique is a triumph for science and technology working together. The uniqueness of well-crystalline material intrigued early natural philosophers, and their examinations, followed b…
The dielectric behaviour of nano-SiO2filled low density polyethylene is investigated over a frequency range of 10 mHz-10 MHz and for different temperatures from 250 K to 350 K. It is shown that the presence of nanoparticles change significantly the dielectric behaviour of the polymer system. The frequency variations o…
Well-crystallized pure hexagonal phase YBO(3):Eu(3+) nanoparticles are prepared by the reverse micelles method. Vacuum ultraviolet photoluminescence (VUVPL) spectroscopy showed size-dependent nonlinear luminescence enhancement with remarkably improved chromaticity (0.62, 0.34), as compared to the commercial bulk YBO(3…
X-ray computed microtomography reveals the internal features of pearls with great detail. This method is useful for identifying some of the natural or cultured pearls that are difficult to separate using traditional X-radiography. The long measurement time, the cost of the instrumentation, and the fact only one pearl…
A brief review of the charge packet phenomena is presented with the aim of identifying the generalities underlying the phenomena, in particular its connection with the well-known soliton phenomena will be explored. The physical mechanisms that may cause it will be evaluated in the light of the experimental evidence, a…
In order to improve the often slow reaction kinetics associated with many metal hydride hydrogen storage materials, we must first develop a detailed understanding of the limiting kinetic mechanisms associated with the materials in question. We used in situ x-ray diffraction to monitor hydride formation in highly contr…
Al-0.61wt%Fe and Al-1.9wt%Fe alloys were atomized in helium and nitrogen atmospheres, using impulse atomization. The microstructure of the droplets atomized in helium and nitrogen were characterized using a number of techniques including X-ray diffraction, micro-tomography and scanning electron microscopy (SEM). In bo…
On Two Nanocomposite Models: Differences, Similarities and Interpretational Possibilities Regarding Tsagaropoulos' Model and Tanaka's Model Nanocomposites consist nowadays a major field of research. This paper investigates the interpretational possibilities of two models developed, namely, Tsagaropoulos' model and Tan…
We investigate the film-growth process of the inhomogeneous sputtered TiO2 thin films by the in situ real-time spectroscopic ellipsometer. The growth process of the film is analyzed by both the uniform and the island film growth models. Based on the analyses from the Ψ-Δ trajectories, the initial thin-film growth corr…
Abstract Silver doped glass powders have been obtained starting from vitellinate/nAg and montmorillonite/nAg. These powders have shown a high biocide activity against the three different types of microorganisms studied: Escherichia coli (gram‐negative bacteria), Micrococcus luteus (gram‐positive‐bacteria), and Issatch…
Nanoparticles have long been sought as promising drug delivery system for cancer therapy, including liposomes, polymeric micelles, polymer-drug conjugates, dendrimers and polymeric nanoparticles. However, conventional nanoparticles would be specifically entrapped by the monocyte phagocytic system (MPS), and then quick…
The low-temperature fracture of a high-temperature low-activated ferritic-martensitic EK-181 chromium (12%) steel (RUSFER-EK-181: Fe-12Cr-2W-V-Ta-B) is studied using impact and static concentrated bending tests as a function of the specimen dimensions (standard, small), the type of stress concentrator (V-shaped notch,…
The method of isotopic exchange was used to study the kinetics of oxygen exchange and diffusion in complex oxides of La1 − x Sr x Co1 − y Fe y O3 − δ (x = 0.0, y = 0.0; x = 0.6, y = 0.2, 0.4). The rates of oxygen interfacial exchange and its diffusion coefficient were determined for LaCoO3 − δ at the pressure of 5 tor…