Materials Literature
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Abstract The starch–polyacrylonitrile graft copolymer prepared from gelatinized wheat starch with ceric ammoninm nitrate as the initiator has been freed of ungrafted polyacrylonitrile and separated into fractions by extraction with dimethylformamide, γ‐butyrolactone, and dimethyl sulfoxide. The copolymer fractions obt…
Abstract The polymers deposited from the vapors of pentane, ethylene, butadiene, benzene, styrene, and naphthalene subjected to glow discharge have been analyzed by infrared absorption techniques. The reaction products show unsaturation, hydrogenation, and branching in the polymer chains. Aromaticity is present only i…
Many oriented growth phenomena, including the elongation of the Nitella internode, are based upon oriented or textured cell wall structure. In many cases the ordered textures are not present in the earliest stages of cell development but appear later. In Nitella lateral cell (leaf) development the first appearance of…
In the low-temperature range, the engineering yield strength of polycrystalline bcc metals can change by a factor of 10 or more with serious consequences appearing in the form of catastrophic brittle fracture. Engineering variables known to have an important effect on the yield behavior are state of stress, temperatur…
Respiration of bacteria was stimulated most by montmorillonite, primarily as the result of this clay maintaining the pH at levels adequate for sustained growth; additional mechanisms also appeared to be involved. Kaolinite and montmorillonite served equally as a source of minerals for bacterial nutrition, and the stim…
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Two models of magnetization reversal for the case of films with biaxial anisotropy are considered: 1 ) the coherent rotation model of Stoner and Wohlfarth (S-W) and 2) the noncoherent or wall-motion model of Kondorsky (K). The former has been considered by several authors previously while the latter is developed in th…
Hydrostatic theories of liquid crystals involve a stored energy function, in simpler theories formally similar to that used in linear elasticity theory. In the latter case, the generally accepted condition that the energy function be positive definitely plays a key role in much theoretical work. Analogous conditions a…
Abstract A staining procedure consisting of preliminary etching with dilute hydrochloric acid, treatment with a mixed solution of alizarin red-S and potassium ferricyanide, and a final treatment with alizarin red-S alone (Dickson, 1965) permits the distinction of orthorhombic carbonates and of calcite from other trigo…
The intensity of back-diffracted low-energy electrons (15–350 eV) from the clean (100), (111), and (110) surfaces of platinum single crystals was measured. From the temperature dependence of the (00) reflection in the range of 25°—700°C, the Debye—Waller factor and the root-mean-square displacements of surface atoms p…
The 4A2 ground state of tetrahedrally coordinated divalent cobalt ions in Cs3CoCl5 and Cs3CoBr5 is investigated with magnetic-susceptibility measurements and paramagnetic resonance in pulsed magnetic fields up to 90 kOe at frequencies in the 70- and 120-Gc/sec bands. The first excited state (4T2) which lies ∼3000 cm−1…
Measurements have been made on the gross-ionization cross sections for 0.1–20-keV electrons on water vapor at pressures of about 3×10−4 torr. The results are compared with the cross sections of H2 and O2. Within the experimental error of 15% we found no deviations from the additivity rule. The energy dependence of the…