Sericin silk protein : unique structure and properties
The origin, biological function, biochemical properties and cosmetic significance of the silk protein, sericin, are reviewed
Materials Literature
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Kaolins, Kaolins, and Kaolins
Abstract Kaolin is an important industrial mineral and geological indicator. It occurs in hydrothermal, residual and sedimentary deposits. The first two are classed as primary occurrences and the third as secondary. The physical and chemical conditions under which kaolins form are at relatively low temperatures and pr…
Synthesis of charged and uncharged complexes of gadolinium and yttrium with cyclic polyazaphosphinic acid ligands for in vivo applications
The synthesis of 18 new macrocyclic complexing agents incorporating phosphinic acid (and carboxylic acid) groups is reported, based on the 1,4,7,10-tetraazacyclododecane ring. Through selective functionalisation of one ring nitrogen or by changing the nature of the P-substituent, anionic, neutral and cationic complexe…
New laterally aromatic branched liquid crystal materials with large nematic ranges
Three new homologous series of mesogens containing three rings in the main structure and a lateral aromatic branch have been synthesized. When the lateral aromatic branch is attached to the middle ring, monotropic phases are observed, and there is a strong tendency to form the smectic C phase. When the lateral aromati…
Inorganic crystal structure prediction using simplified potentials and experimental unit cells: application to the polymorphs of titanium dioxide
The use of lattice energy minimization techniques to generate the structures of titanium dioxide polymorphs is demonstrated, given cell dimensions and contents without symmetry or geometry assumptions. The method yields the structures of rutile, anatase and brookite and, additionally, the TiO2(II) structure. Combined…
Bridging the Ruddlesden–Popper and the Dion–Jacobson series of layered perovskites: synthesis of layered oxides, A 2–x La 2 Ti 3–x Nb x O 10 (A = K, Rb), exhibiting ion exchange
Solid solutions of the formula, A2–xLa2Ti3–xNbxO10(A = K, Rb), exist for the range 0⩽x⩽1.0, bridging n= 3 members of the Ruddlesden–Popper series (A2La2Ti3O10) and the Dion–Jacobson series (ALa2Ti2NbO10). For 0⩽x⩽0.75, the phases possess body-centred structures characteristic of the Ruddlesden–Popper phases, while the…
Dynamic model of a three-phase power transformer
An adequate mathematical model of a three-phase power transformer is one of the important elements in the programs for the computer analysis of power system transients. Featured in this paper is the simulation model of a three-phase, three-limb core-type power transformer. Nonlinear effects of saturation, hysteresis a…
Plane-wave shielding characteristics of anisotropic laminated composites
The EM plane-wave shielding properties of anisotropic laminated composites are analyzed, based on a model that treats each lamina as a homogeneous and anisotropic sheet and then uses a method that cascades the wave-transmission matrices in the computation, Numerical results are presented for graphite/epoxy laminates.…
THE MAJOR INTRINSIC LIGHT‐HARVESTING PROTEIN OF Amphidinium: CHARACTERIZATION AND RELATION TO OTHER LIGHT‐HARVESTING PROTEINS
A major light-harvesting complex (LHC) has been obtained from thylakoids of Amphidinium carterae solubilized with digitonin or decylmaltoside and separated by sucrose-gradient centrifugation. The digitonin-LHC forms a dark brown band at approximately 17% sucrose and the decylmaltoside LHC one at approximately 7% sucro…
Plasma deposition for biomedical applications: A brief review
Radio frequency plasma-deposited thin films offer an advantageous mechanism to alter the surface properties of biomaterials and medical devices without affecting the mechanical properties or primary fabrication. Such coatings are tightly adherent, conformal, and easily applied. They also exhibit excellent biocompatibi…
Microcreep deformation measurements by a moire method using electron beam lithography and electron beam scan
Microcreep deformations in pure copper specimens are studied by a new moiré method. In this method, a fine micrograting prepared by electron beam lithography is used as a model grating, and a scanning exposure ofthe primary electron beam in a scanning electron microscope (SEM) as a master grating. The scanning exposur…
Influence of Aging on the Physical-Mechanical Properties of Acrylic Resin Films Cast from Aqueous Dispersions and Organic Solutions
The physical-mechanical properties of the enteric copolymers, poly(methacrylic acid, ethyl acrylate) Eudragit® L100-55, and Eudragit® L30D have been investigated. Free films of the copolymer containing varying levels of glyceryl triacetate (triacetin) and citrate ester (Citroflex®) plasticizers were prepared by both a…
Fourier-transform infrared photoacoustic studies of hydrogenated diamond surfaces
Fourier-transform infrared photoacoustic spectroscopy (FTIR-PAS) is shown to be a useful tool for structural studies of hydrogen and/or oxygen chemisorption on the surface of diamond powders. As compared with the diffuse reflectance method or the KBr pellet method, it has become clear that PAS has an advantage in term…
Effects of Plasticizers on Water Permeation and Mechanical Properties of Cellulose Acetate: Antiplasticization in Slightly Plasticized Polymer Film
The effects of plasticizers, triacetin and three different molecular weights of polyethylene glycol, on the water permeation and mechanical properties of cellulose acetate were investigated. At 37°C, the water permeability of cellulose acetate was found to decrease with increasing plasticizer to a minimum and then to…
Hydrogen bond-induced ferroelectric liquid crystals
Hydrogen-bonded dimers of 4-alkoxy-4′-stilbazole homologues (C n OSB, proton acceptors) and the mono-(2-methylbutyl)ester of terephthalic acid (MBTA, proton donor) behaved like conventional thermotropic mesogens. For chiral MBTA mixtures, chiral nematic and blue phases were observed with n = 1 and 2, and chiral smecti…
Plasma surface modification of polyethylene: short-term vs. long-term plasma treatment
A remote plasma reactor, with air as the plasma gas, has been used for in-line surface modification of linear low-density polyethylene tape (LLDPE) passing 10 cm below the main plasma zone. Line speeds of up to 0.70 m/s were tested, allowing the study of 0.014 s exposure times to the plasma. Oxygen to carbon (O/C) rat…
A Bilinear Failure Criterion for Mixed-Mode Delamination
Many different failure criteria have been suggested for mixed-mode delamination toughness, but few sets of mixed-mode data exist that are consistent over the full range of Mode I opening load to Mode II shear load range. The mixed-mode bending (MMB) test was used to measure the delamination toughness of a brittle epox…
Synthesis of icosahedral carboranes for second-harmonic generation. Part 2
The synthesis and non-linear optical properties of a series of Icosahedral carboranes are described. The carboranes are substituted on both carbon atoms, with a series of electron-donating and electron-withdrawing substituents. The single-crystal X-ray structure of two of the series 1,2-bis(3-nitrophenyl)-1,2-dicarba-…
Diagnosis of partial discharge signals using neural networks and minimum distance classification
Two different methods for classifying partial discharge (PD) phenomena by a personal-computer-aided system are described. The first is concerned with common minimum distance classification, using statistical data on pulse quantities such as apparent charge, energy and phase. Applying the correct algorithms and feature…
Procedures in electron microscopy
Setting up an electron microscopy facility biomedical specimens materials specimens basic materials specimen preparation techniques for TEM specialized specimen-dependent preparation techniques for TEM immunocytochemical techniques for TEM and SEM general techniques for TEM observation general preparation techniques f…