Materials Literature
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A class of temperature-sensitive (ts) mutants of T4 lysozyme with reduced activity at 30 degrees C and no activity at 43 degrees C has been selected. These mutants, designated "tight" ts mutants, differ from most other T4 lysozyme mutants that are active at 43 degrees C, but only manifest their ts lesion by a reduced…
We report x-ray photoemission spectra of polystyrene (PS). XPS spectra were measured with the SSI, SSX-100 model, using monochromated Al Kα x-rays. We present the survey spectrum (binding energy range of 0–1100 eV) and a narrow spectrum of C 1s. The polymer is used as a reference to study the influence of PS surface m…
The flammability of a filled ethylene-propylene copolymer is discussed. A mineral filler with 40% of hydromagnesite and 60% of huntite by weight is used as a flame retardant additive. Some burning characteristics and mechanical properties have been studied in relation to the amount of incorporation. Flammability was m…
Abstract A theoretical study of the thermodynamic properties in the Einstein‐Debye approximation is made for solids with polyatomic basis. Analytical expressions are derived for the equation of state, isobaric specific heat ( C p ), and linear thermal expansion coefficient (α P ). The temperature dependences of C p an…
The thermal expansion coefficients along the a axis (αa) and c axis (αc) of barium hexaferrite were measured from room temperature to 850 °C. The thermal expansion of barium hexaferrite along the a axis and c axis was found to be linear as a function of temperature, indicating constant thermal expansion coefficients o…
Multiline upconversion luminescence ranging from 375 to 635 nm was studied in Yb:Tb:YSGG crystal, a possible candidate for a tunable upconversion laser material. This luminescence was attributed to the transitions starting from the 5D3 and 5D4 excited levels of Tb. Two sequential steps in the upconversion were determi…
I describe new phases of a chiral liquid crystal with nematic and hexatic order. I find a conical phase, similar to that of a cholesteric in an applied magnetic field for Frank elastic constants $K_2>K_3$. I discuss the role of fluctuations in the context of this phase and the possibility of satisfying the inequality…
The effect of externally added molybdate (MoO42–) on the repassivation and SCC behavior of type 304 (UNS S30400) stainless steel (SS) was investigated in 1 M hydrochloric acid (HCl) at open-circuit potential (OCP). With the addition of MoO42–, the time to failure initially decreased but then gradually increased. From…
Abstract The bonding in the recently reported Cs 3 Te 22 phase, which contains both Te 8 rings and remarkable Te 6 sheets, is studied by approximate molecular orbital theory. Our focus is on the geometric and electronic features of the unique 2,3‐connected Te net found as a substructure in this phase. The calculations…
The fluorescence lifetime of a triphenylmethane dye, malachite green, doped in three glass-forming associated solvents, 1-propanol, propylene glycol, and glycerol, was measured in a wide temperature range. For each sample three temperature regimes were found in the temperature dependence of the nonradiative relaxation…
Abstract 1 H and 127 I NMR, differential thermal analysis (DTA), differential scanning calorimetry (DSC), electrical conductivity, and powder and single crystal X‐ray diffractions were studied for trimethylethylammonium iodide. Three solid phases, named I, II, and III, were obtained above 410 K, between 336 and 410 K,…
The photoinduced radical crosslinking of α,ω-ene-terminated silicones (vinyl, vinyloxy, allyl, norbornenyl, etc.) with siloxanes containing pendant mercapto groups has been investigated by means of calorimetry, Raman and swelling measurements. The reaction enthalpy depends on the type of olefin. The values vary from 9…
S-Adenosylmethionine synthetase (MAT, ATP:L-methionine S-adenosyltransferase, E.C.2.5.1.6.) plays a central metabolic role in all organisms. MAT catalyzes the two-step reaction which synthesizes S-adenosylmethionine (AdoMet), pyrophosphate (PPi) and orthophosphate (Pi) from ATP and L-methionine. AdoMet is the primary…
Reaction of β-enaminoketones with lanthanide salts leads to mesomorphic complexes displaying an SA mesophase. The mesophase was characterized using X-ray scattering, EPR and magnetic susceptibility. A very high magnetic anisotropy was deduced for a complex containing dysprosium.
The water vapor permeability of a given material plays an important part in evaluating the physiological wearing comfort of clothing systems or deter mining the performance characteristics of textile materials used in technical applica tions. Many methods are used for measuring the parameters of water vapor transfer t…
Abstract A model that makes it possible to evaluate the secondary nucleation rate in a pilot‐scale industrial crystallizer is presented. It relates the secondary nucleation rate directly to the volume rate of attrition of large parent crystals. Two other terms are included in the equality, one that expresses the distr…
Good damping materials should exhibit a high loss factor value over a broad temperature range. Polyurethane and polystyrene are highly immiscible polymers with glass transition regions far apart. The interpenetrating polymer network topology can restrict phase separation and result in materials with a broad transition…
A model is presented to interpret in situ laser reflectance interferometry (LRI) measurements of film growth. The model uses no adjustable parameters and measures film thickness, growth rate, attenuation, and root-mean-square (rms) surface roughness in situ and in real time. For the particular case of diamond film gro…
Abstract Highly filled lignin/polyethylene composites, with enhanced mechanical properties, were studied. Composites are prepared using the catalytic grafting technique of polyethylene on lignin particles. This technique improves wetting and dispersion of additives in the matrix as well as interactions between these t…
Abstract Three isomeric bis(ether carboxylic acid)s, 4,4′‐[1,2(1,3 or 1,4)‐phenylenedioxy]dibenzoic acid ( o ‐, m ‐, or p ‐ 3 ) were prepared by nucleophilic substitution reaction of the potassium phenolate of catechol, resorcinol, and hydroquinone, respectively, with p ‐fluorobenzonitrile, giving the corresponding bi…