Materials Literature
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Although highly stable toward unfolding, native ribonuclease A is known to be cleaved by unspecific proteases in the flexible loop region near Ala20. With the aim to create a protease-resistant ribonuclease A, Ala20 was substituted for Pro by site-directed mutagenesis. The resulting mutant enzyme was nearly identical…
Let \varphi be a primitive, non-periodic substitution. The tiling space \mathcal{T}_\varphi has a finite (non-zero) number of asymptotic composants. We describe the form and make use of these asymptotic composants to define a closely related substitution \varphi^* and prove that for primitive, non-periodic substitutio…
The increasing interest in the application of plasma processes on textiles is due both to the necessity of adding value to products and to develop new pollution free technologies. In fact, plasma treatments allow modification of the textile surface behaviour with a flexible process, which can impart particular propert…
The coordinatively unsaturated dinickel(II) complex [(L2)Ni2](BPh4)2 (2), where (L2)2- represents the dianionic form of the 'N4S2' ligand N,N'-bis(2-thio-3-aminomethyl-5-tert-butylbenzyl)propane-1,3-diamine), has been investigated with respect to its ability to function as a building block for the preparation of polyn…
Abstract Ultrasonic degradation of polymers is distinguished from thermal degradation by: midpoint rather than random chain scission; a lower limit of molecular weight (MW), x f , below which the polymer will not undergo midpoint scission; and possible biomodal distribution evolving with time. The molecular‐weight dis…
CeO2 nanocrystalline films were deposited on SiO2 and SiO2/Si(100) substrates by plasma enhanced-chemical vapor deposition (PE-CVD) in Ar–O2 atmospheres. Ce(dpm)4 (dpm = 2,2-6,6-tetramethyl-3,5-heptanedionate) was used as a precursor, which allows a clean conversion into CeO2 due to the presence of Ce–O bonds. The coa…
Klebsiella pneumoniae is presently unique among bacterial species in its ability to metabolize not only sucrose but also its five linkage-isomeric alpha-d-glucosyl-d-fructoses: trehalulose, turanose, maltulose, leucrose, and palatinose. Growth on the isomeric compounds induced a protein of molecular mass approximately…
Abstract Nanocomposites of poly(vinyl alcohol) (PVA) with iron, cobalt, or nickel sulfides were successfully prepared using a hydrothermal process by an in situ reaction with CS 2 at 140°C for 8 h. XRD results showed that pure phases of FeS 2 , CoS 2 , and NiS were obtained in the as‐prepared nanocomposites. They also…
Minor phases which strongly concentrate selected trace elements, termed here ‘carrier-phases’, release relatively large amounts of those elements to the liquid phase when they are eliminated during partial melting and glean relatively large amounts of those elements when they first appear during progressive crystalliz…
It has been shown in recent years that one-dimensional (1D) atomic transport plays an important role in radiation damage accumulation in metallic materials under cascade irradiation conditions. This transport is due to clusters of self-interstitial atoms (SIAs) that form directly in cascades and migrate along close-pa…
Abstract Essential elements of thermolytic reaction kinetics for distributions of polymers are reviewed. Bond scission, occurring randomly along a chain backbone or at the chain end, is the major reaction process in polymer thermolysis. Underlying this bond scission are free radical mechanisms, including initiation an…
A three dimensional micro-mechanical model is developed by using a three dimensional geometric model and the variational principles for woven fabric composites. The unified modeling strategy starts with developing the three dimensional description of the general woven fabric geometry based on textile processing scienc…
Abstract This article presents our preliminary experimental data on the release kinetics and encapsulation efficiency of urea formaldehyde (UF) crosslinked matrices of starch (St), guar gum (GG), and starch + guar gum (St + GG) for the controlled release of solid (chlorpyrifos) and liquid (neem seed oil) pesticides. T…
Eukaryotic histone proteins condense DNA into compact structures called nucleosomes. Nucleosomes were viewed as a distinguishing feature of eukaryotes prior to identification of histone orthologs in methanogens. Although evolutionarily distinct from methanogens, the methane-producing hyperthermophile Methanopyrus kand…
The electrokinetic properties of macroscopic solids can describe both the surface modifications as well as the interaction abilities during processing. Normally the zeta potential (ζ) is measured and can be used to develop, optimise and control the manufacturing process. The zeta potential of natural and regenerated c…
A new set of trimesogens consisting of a cholesteryl ester, a biphenyl and an azobenzene mesogenic segment joined together through either odd-even, even-even or odd-odd central alkylene spacers has been synthesized and the liquid crystalline properties investigated. The trimesogens having even-even and odd-odd central…
Relaxation processes in a hyperbranched polyester with terminal hydroxyl groups have been investigated. The study emphasizes the molecular weight dependence of conductivity and γ-relaxations as the α- and β-relaxations are masked by the conductivity. It is found that the conductivity relaxation follows a non-Arrhenius…
The crystal structures of nacaphite, Na (Na,Ca)2 (PO4) F, a 5.3232(2), b 12.2103(4), c 7.0961(2) Å, 90.002(1), 89.998(1),
In an attempt to determine the carrier of the Extended Red Emission (ERE), we have investigated a series of amorphous and crystalline materials: natural coal, amorphous hydrogenated carbon, amorphous hydrogenated silicon carbide, porous silicon, and crystalline silicon nanoparticles. The photoluminescence (PL) behavio…
Abstract Dielectric responses of polyaniline (PANI) salt films, made from two different methods, were compared to investigate the effect of a dopant and film‐formation methods on the dielectric properties. One of the film‐formation methods for emeraldine salt was the film‐doping method, and the other, the solution‐dop…