Materials Literature
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The memory-mode operation of a polymer dispersed liquid crystal (PDLC), which depends on the stiffness of the layer structure in the smectic-A phase, has been analysed by comparing ordinary PDLC and holographic PDLC (HPDLC). Although both PDLC films were fabricated from the same material, the temperature range of the…
The gene encoding D-hydantoinase from Agrobacterium radiobacter NRRL B11291 was successfully cloned by use of polymerase chain reaction. A positive clone was scored, and its nucleotide sequence was further analyzed. The analysis by deleting various lengths of nucleotides from the amino terminus of the open reading fra…
The tuning of strength and anisotropy of S⋅⋅⋅S interactions in the molecular crystals of the TTF family can be achieved by changing the subsituent attached to the S atoms. This result comes from investigations that combine the results of a statistical analysis of the known TTF-based molecular crystals (neutral and cha…
We report in this paper measurements of the rising velocity of champagne bubbles, investigated by using a camera and a stroboscopic light. It is shown that the velocity of bubbles during ascent is intermediate between that of a rigid sphere and that of a fluid sphere free from surface-active compounds. We show that ou…
A porphyrin covalently appended monolayer film on a glass substrate prepared by axial coordination reaction of protoporphyrin IX zinc (ZnPP) and a self-assembled monolayer of (3-aminopropyl)trimethoxysilane on a glass surface was reported. The structure and stability of the porphyrin film to photo reaction, acid, and…
Microwave irradiation for 15 minutes allowed the highly selective hydrothermal synthesis of the diamagnetic, air-stable oxidation catalyst [PW11O39RuII(DMSO)](5-), as confirmed by H-1, P-31, Ru-99 and W-183 NMR techniques.
Infrared spectroscopy is being increasingly utilized for the analysis of peptides and proteins because it probes the universally available amide (peptide) bonds, which display distinct IR signals for differently folded peptides and proteins. Other spectroscopic techniques useful for studying protein structures in solu…
Pyrazole and pyridine adducts of methyltrioxorhenium(VII) form bisperoxo complexes with excess H2O2 (see picture). Density functional calculations reveal that the increased efficiency of these complexes as catalysts for olefin epoxidation originates from their stability and from the moderate energies of the correspond…
Infrared spectroscopy is being increasingly utilized for the analysis of peptides and proteins because it probes the universally available amide (peptide) bonds, which display distinct IR signals for differently folded peptides and proteins. Other spectroscopic techniques useful for studying protein structures in solu…
Elastic energy absorption measurements versus temperature on semiconducting, semi-insulating (SI) and Fe-doped InP are reported. A thermally activated relaxation process is found only in the SI state, which is identified with the hopping of H atoms trapped at In vacancies. It is proposed that the presence of In vacanc…
Numerical results based on an extended BPM algorithm indicate that, in Marcatili's lossless tapers and bends, through-flowing waves are drastically different from standing waves. The source of this surprising behavior is inherent in Maxwell's equations. Indeed, if the magnetic field is correctly derived from the elect…
The possibility of existence of a magnetic monopole has been surveyed by P. Dirac even in 1931, and then from the point of view of the modern theory by A.M. Polyakov and G.~ 'tHooft in 1974. Numerous and unsuccessful attempts of experimental search for monopole in cosmic rays and on accelerators in high energy particl…
Polar dyes can be solubilized in apolar media-molecular nanocapsules with hydrophilic interiors have been prepared (see schematic representation) using polyglycerols with narrow polydispersity and simple esterification with fatty acids. These unimolecular micelles offer attractive potential for a variety of applicatio…
A method by which to overcome the clinical symptoms of atherosclerosis is the insertion of a graft to bypass an artery blocked or impeded by plaque. However, there may be insufficient autologous mammary artery for multiple or repeat bypass, saphenous vein may have varicose degenerative alterations that can lead to ane…
Abstract A method based on the intrinsic viscosities of transfer has been used to predict miscibility of polymer blends. This method has been applied to study the change in the phase behaviour of a microphase separated polyester polyurethane (PSPU) on blending with polyvinyl chloride (PVC), polyvinyl acetate (PVAc) an…
Article Refinement of the crystal structure of dithallium(I) trioxotellurate(IV), TI2TeO3 was published on December 1, 1999 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 214, issue 4).
In-situ attenuated total reflection (ATR)-FTIR spectroscopy enabled studies on the interaction between the differently charged model proteins human serum albumin, lysozyme, immunoglobulin G and multilayer assemblies, which were deposited by alternating adsorption of poly(ethyleneimine) and poly(acrylic acid) onto Si c…
Dentre as diversas técnicas de caracterização superficial de filmes poliméricos, foram utilizadas nos filmes de PET do presente estudo a refratometria, rugosidade, análises de coeficiente de atrito e ângulo de contato. As amostras de filmes de PET analisadas têm 12mim de espessura e compreendem três tipos de estuturas…
A study was made on plasma-initiated emulsion polymerization and kind of ultra-high molecular weight poly(methyl methacrylate) (PMMA) was obtained. The viscosity-averaged molecular weight M η of this PMMA is over 1×10 7 in the measurement of viscosity by using Butanone as solvent. Its glass transition temperature T g…
The effects of nitrogen (680 and 1600 ppm) on the microstructure and electrochemical behaviour of thermally aged type 316LN stainless steels is discussed. Electrochemical potentiokinetic reactivation tests indicated a decrease in chromium depleted regions with increasing nitrogen addition in austenitic stainless steel…