Materials Literature
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Abstract Adsorption experiments were conducted by mixing homoionic kaolinite and C 14 -labeled hydrolyzed polyacrylonitrile (HPAN) in water and solutions of electrolytes. Langmuir type adsorption isotherms resulted. Exchange cations on kaolinite increased adsorption in approximately the same order as such cations redu…
In a previous communication, it was shown that on prolonged exposure to urea at temperatures above 20" pepsin is irreversibly inactivated (1).The loss of activity is most marked in the pH range of 4.6 to 5.6 and is always accompanied by the formation of nonprotein material that originates from autodigestion of the pro…
substrate during the reaction; wavelength, 284 mu (or within the range 284-290 mu); initial substrate concentration, within the range 0 1-0 3 mg./ml.; slit width as narrow as possible. The final decision on slit width will depend on the conditions of the experiment and the sensitivity and stability of the spectrophoto…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNotes- Epoxidation of Cinnamaldehyde by Alkaline tert-Butyl HydroperoxideGeorge PayneCite this: J. Org. Chem. 1960, 25, 2, 275–276Publication Date (Print):February 1, 1960Publication History Published online12 March 2003Published inissue 1 February 1960https://doi.org/10.102…
SUMMARY: Observations on living colonies of Streptomyces coelicolor strain A3(2) growing on cellophan films were made by phase-contrast microscopy. Particular attention was paid to the mode of origin of the aerial mycelium. It was shown conclusively that aerial hyphae can originate as simple branches of the substrate…
Abstract Aliphatic chain molecules may be adsorbed on montmorillonite surfaces with the zigzag of their carbon chain either parallel or perpendicular to the surface. These orientations are designated α II and α I , respectively. Fourier syntheses have too few terms to distinguish clearly between these orientations. Th…
Abstract Desilication and removal of bases from the basalitic rocks of the Hawaiian Islands produces large amounts of halloysite and gibbsite, together with variable quantities of allophane and nontronite, iron and titanium oxides, and amorphous mineral and gel material. The nature and relative abundance of intermedia…
Magnesium and aluminum single crystals subjected to varying amounts of oscillatory strain of audio frequency have been investigated by measuring the strain amplitude-dependent complex dynamical-mechanical modulus at audio frequencies as a function of temperature and time. If the amplitude of the applied excitation exc…
Received 21 December 1959DOI:https://doi.org/10.1103/PhysRevLett.4.128©1960 American Physical Society
X‐ray, optical, and chemical data are presented for sillimanites and for a wide range of natural and synthetic mullites. Single‐crystal X‐ray studies have revealed a new type of mullite (called S mullite) characterized by subsidiary sharp reflections in distinction to the extra diffuse reflections of common mullite (c…
Abstract A study was made of the mechanical and equilibrium swelling properties of five series of polyurethane elastomers prepared from polyoxypropylene glycol 2025, dipropylene glycol, trimethylol propane, and either toluene diisocyanate (TDI) or hexamethylene diisocyanate (HDI). The study included the dependence of…
Technical Briefs Radiation Fin Effectiveness J. G. Bartas, J. G. Bartas General Electric Company, West Lynn, Mass. Search for other works by this author on: This Site PubMed Google Scholar W. H. Sellers W. H. Sellers Calculations and Special Problems Unit, General Electric Company, West Lynn, Mass. Search for other wo…
A number of single crystal tungstates have been prepared for paramagnetic resonance and emission studies. Compositions such as monoclinic MgWO4, ZnWO4, CdWO4, and tetragonal CaWO4, SrWO4, and BaWO4 containing paramagnetic ions of the transition and rare earth series have been prepared. They were grown by dissolving th…
Abstract A study of polyethylenes and ethylene–vinyl acetate copolymers by dynamic mechanical mesurements gives new information on the transitions in polyethylene polymers. The melting points agree with the predictions of Flory's theory. The alpha transition is shown to be due to the melting of crystallites containing…
A method of embedding biological specimens in araldite 502 (Ciba) has been developed for materials available in the United States. Araldite-embedded tissues are suitable for electron microscopy, but the cutting qualities of the resin necessitates more than routine attention during microtomy. The rather high viscosity…
This investigation has sought to determine the significance of the wide range of extractable collagen fractions which appear to exist in growing connective tissues and to determine their position in the process of fibrogenesis. Carrageenin granulomata were induced in guinea pigs and, after injection of (14)C-glycine,…
Abstract There is need of an economical and safe method of disposing of radioactive waste produced by nuclear reactors. A method for the incorporation of fission products into glass is being studied at Chalk River. Class containing up to 50 curies of fission products per kilogram has been made during the investigation…
Abstract The changes occurring in fully hydrated halloysite during dehydration have been studied by X-ray diffraction at relative humidities that ranged from 0 to 100 percent. From the results of this study it has been concluded that: (1) layers dehydrate randomly, but instantaneously; (2) the diffraction from an indi…
It is well known that, during the displacement of a fluid contained in a porous medium by another less viscous one, the displacement front may become unstable: Fingers occur which proceed rapidly through the system.The Muskat–Aronofsky model of displacement in porous media, in which it is assumed that a sharp front ex…
Abstract The smectic clays from Cabo de Gata region, Almeria, Spain, are composed mainly of montmorillonite, but they contain appreciable quantities of fibrous clay minerals, some of which are of the palygorskite type. However, there also is a mineral that has properties intermediate between those of palygorskite and…