Materials Literature
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Two experimental approaches were used to estimate the relative efficacy of three germicidal preparations as postmilking teat dips. In successive trials of 17 and 7 months, ehlorhexidine (.2%) and a commercial iodophor (1% available iodine) each reduced the overall new intramammary infection to 4 to 5 per hundred cows…
The failure of aluminum-to-gold ultrasonic bonds, after storage at elevated temperature, is often accompanied by the presence of "purple plague". However, this purple intermetallic phase can also be present in bonds that remain strong after the same treatment. Bond failure has been connected with the presence of impur…
1. The epidermis of Glycera consists of interdigitating columnar cells and mucus secreting goblet cells. Both types of cells are covered by a collagenous cuticle, 1 to 12 µm thick. 2. The cuticle is made up of layers of orthogonally arranged tubules in an amorphous matrix. Individual tubules measures 0.1 to 0.3 µm in…
The Palana palynological assemblage described here consists of 8 genera and 11 species of pteridophytic spores, 24 genera and 36 species of angiospermic pollen grains, 9 genera and 16 species of algal and 3 genera and 4 species of fungal remains. Of the total of 44 genera and 67 species recorded, 10 genera and 31 spec…
Single crystals of polyethylene are investigated by transmission electron microscopy. The observed effects suggest that in polyethylene screw dislocations exist, the Burgers vector of which is parallel to the chain molecules. The dislocation densities were between 108 and 1010 cm−2. Evidence for the splitting of the o…
A model of the crystal-melt interface is proposed which specifically accounts for a reduced liquid entropy in the region of the interface. Based on this model, the interfacial free energies of Ag, Al, Na, and Li are calculated, and the values thus determined are in excellent agreement with experimental values.
Neutron diffraction measurements were made on single crystals of KCN to obtain information about the disorder of the CN− ions in the cubic phase. The crystals were obtained by pulling from the melt by a modified Czochralski method. Data were collected on two four-circle diffractometers at room temperature and at 180°K…
Abstract By using the carbon‐13 NMR technique, it is shown that there are no cis ‐1,4– trans ‐1,4 linkages in a n ‐BuLi‐catalyzed polybutadiene. The polymer consists of “blocks” of cis ‐1,4 units and trans ‐1,4 units separated by isolated vinyl units. Preliminary evidence suggests this might also be true for other typ…
The optical properties of a thin film of liquid crystal, with one of its surfaces bounded by the isotropic liquid of the same compound, reveal the existence of point defects in the liquid crystal. Particular sample geometries are examined in which the detailed structure of the optical patterns seen with polarized ligh…
Abstract The surface oxidation of polypropylene films which occurs during ultraviolet irradiation in air was found to result in extensive surface restructuring. This restructuring was detected by changes in surface infrared spectra, as measured by attenuated total reflection spectroscopy, and by electron microscopy. T…
Abstract Polarized luminescence is observed for In ++ (h v m I = 2.12 eV) and In ++ v (h v m I = 1.75eV) centres in X‐irradiated KCl:In. Spectral and polarization characteristics of the luminescence are investigated. The symmetry of excited In ++ centres is established to be tetragonal. The energy level diagram and th…
Centrifuge measurements and electrostatic charge measurements have shown that the force of adhesion of xerographic toner particles to carrier beads can be described by an electrostatic model. In this model the triboelectric charge on the toner particle is attracted by its countercharge residing on the bead surface and…
Abstract The trapping of holes by In + and In + v centres in KCl:In is found to be accompanied by luminescence of the same spectral composition as the emission spectra of In ++ and In ++ v centres, respectively. The processes of migration and trapping are investigated for holes thermally or optically released from In…
Abstract The excitation of the Cs‐5p core level in Cs halides which starts a t about 13 eV was studied by measuring the reflection spectra of evaporated films between 12.5 and 26 eV at room temperature and a t 30 K. Synchrotron radiation was used as a light source. In comparison to the spectra at room temperature new…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorine-19 nuclear magnetic resonance study of the binding of trifluoroacetylglucosamine oligomers to lysozymeF. Millett and M. A. RafteryCite this: Biochemistry 1972, 11, 9, 1639–1643Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Publis…
Nuclear magnetic resonance measurements of spin-lattice relaxation time and resonance line shapes have been carried out as a function of temperature in the range 77–715°K for 1H contained in yttrium hydride. The composition ranged from YH2.61 to YH2.94 and included three samples in the hydrogen-deficient trihydride ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis in organosilicon chemistry. III. Catalytic mode, solvent isotope effets, and transition-state structure in hydride expulsion from siliconKathleen O'Donnell, Rhonda Bacon, K. L. Chellappa, Richard L. Schowen, and J. K. LeeCite this: J. Am. Chem. Soc. 1972, 94, 7, 25…
Abstract An unsaturated polyester resin and the styrene‐crosslinked polyester were studied with laser Raman spectroscopy. Following the polyesterification reaction, Raman measurements showed that the polyester contained 55% fumarate and 45% maleate unsaturation. Additionally, the glycol fragment was indicated to exist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of iron and rare-earth polymers of di(2-ethylhexyl)phosphoric acidTakeo Harada, Morton Smutz, and Renato G. BautistaCite this: J. Chem. Eng. Data 1972, 17, 2, 203–204Publication Date (Print):April 1, 1972Publication History Published online1 May 2002Publishe…
The spectra of nickel dissolved in silicate and aluminosilicate glasses with alkali and alkaline‐earth modifiers were studied systematically as functions of composition, annealing and temperature, concentration of Ni 2+ , and redox conditions during melting. Although reducing conditions produced a gray scattering phas…