Materials Literature
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The 14C-labelled extracellular materials released from cultures of Synedra acus and Stephanodiscus hantzschii were separated by paper chromatography. The major components were identified and their rates of release measured. Stephanodiscus in axenic culture released the same extracellular materials under optimum light…
The effects of interfacial orientation on the viscosity of nematic p-azoxyanisole have been studied. Viscosity was measured in four glass capillary tube viscometers with diameters ranging from 78μ to 516μ. The surfaces of the capillaries were subjected to two standardized pretreatmenta—acid cleaning or acid cleaning f…
Abstract Orthopedic appliances of type 316 (SMO) stainless steel were examined in detail after being removed from human subjects. Techniques included conventional microscopy with various lighting methods, together with electron microscope fractography. Corrosion, fatigue failure, and manufacturing defects were identif…
Electron-diffraction data for B2Cl4 with SiCl4 present as an impurity have been gathered at nozzle temperatures of 251°, 295°, 331°, 376°, and 423°K. Complete structural analyses of both molecules were carried out at the lowest and the highest temperatures by least squares based upon intensity curves, but converged re…
Some recent applications of the Oseen-Zocher-Frank elastic theory of nematic and cholesteric liquid crystals are reviewed. (1) The effects of a static magnetic field H are calculated in detail. In particular, for a cholesteric system, the spiral structure is distorted by the field and the period increases with H, up t…
Sankar L Adhya, James A Shapiro; THE GALACTOSE OPERON OF E. COLI K-12. I. STRUCTURAL AND PLEIOTROPIC MUTATIONS OF THE OPERON, Genetics, Volume 62, Issue 2,
Conductivity measurements in various polycrystalline ferrites have shown that the temperature dependence of the conductivity has to be described by two different activation energies, one which is attributed to the bulk material and the other which is due to the poorly conducting layers introduced by Koops. Activation…
The bacteriocin from Pseudomonas aeruginosa, pyocin, consists of a contractile sheath and inner core reminiscent of T-even coliphage tails. Contraction of the outer sheath was found to be promoted by 0.5 m magnesium chloride, 1% Formalin, low pH, sonic treatment, and freezing or thawing or both. The contraction caused…
Abstract The work reported here affirms that the ependyma supports tail regeneration and demonstrates that the peripheral nerve supply makes no essential contribution to the regenerative process. The normal peripheral nerve supply in the tail of Anolis carolinensis was found to be 4.5 fibers per (100 μ) 2 . In tails i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermophysical properties of the lanthanide oxides. V. Heat capacity, thermodynamic properties, and energy levels of cerium(III) oxideBruce H. Justice and Edgar F. Westrum Jr.Cite this: J. Phys. Chem. 1969, 73, 6, 1959–1962Publication Date (Print):June 1, 1969Publication His…
A defect diffusion coefficient was determined in single crystal aluminum oxide from 1400° to 1850°C by measuring the movement of the color boundary in a Ti 3+− doped single crystal heated in air. In this temperature range the experimental data can be represented by The interpretation developed is that this equation re…
The mechanism of the interfibrillar and intrafibrillar swelling of cotton has been investigated by infrared and x-ray methods. Emphasis is on swelling in caustic soda, but other reagents are also considered. The presence of intrafibrillar swelling can be shown by detection of intermediate complex formation, while the…
A brief survey is given of recent applications of electrode potential measurements for the study of the corrosion of metals and alloys in the presence of aqueous solutions, molten salts and gaseous atmospheres. Particularly considered are: (1) cathodic and anodic protection of passivable metals and alloys in the prese…
Mixtures of cholesteryl iodide and cholesteryl bromide with cholesteryl nonanoafce were exposed to UV radiation and the resultant color shifts were measured as a function of exposure and composition. The formation of images by this process will be described, and the presiding mechanism will be briefly discussed.
CdO films were prepared by a D–C reactive sputtering method with various sputtering voltages. The characters of the prepared films are compared with the reflection electron diffraction and X-ray diffraction patterns. Especially, the effects of the sputtering voltage and partial pressure of oxygen were investigated con…
The crystal structure of the Mn3+-bearing epidote, piemontite, has been refined. For a crystal of composition, Cz6,PmPSll, refinement of the occupancies cf the two large, nominally calcium sites and the three non-equivalent octahedral sites, gives: where M = MnD. ,Feu. All of the (Mn, Fe) substitution for Al occurs in…
Carbon fibres graphitized at high temperature have been investigated by the techniques of x-ray diffraction and electron microscopy. The particular sample discussed here contains misoriented turbostratic crystals stacked end to end with widths in the range 20-110 Å; the maximum frequency occurs at 65 Å and this is als…
Abstract The thiol‐disulfide exchange reaction is shown to be applicable to cleavage of disulfide crosslinks in accelerated sulfur vulcanizates of natural rubber. The reaction, in conjunction with the previously reported selective cleavage of polysulfide crosslinks, is used to determine the distribution of crosslink t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization and dissolution of strontium sulfate in aqueous solutionJames Reid Campbell and G. H. NancollasCite this: J. Phys. Chem. 1969, 73, 6, 1735–1740Publication Date (Print):June 1, 1969Publication History Published online1 May 2002Published inissue 1 June 1969http…
Several gram-negative, polarly flagellated rods were isolated on the basis of their flocculent growth habit. Some of the isolates possessed a capsular matrix which is composed of exocellular fibrils. Other isolates did not appear to have a capsular matrix when examined with a bright-field microscope with or without th…