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Abstract The content of acrylic acid and acrylamide in their copolymers can be controlled by changing pH. The reactivity ratio of acrylic acid decreases with increasing pH, while the reactivity ratio of acrylamide increases with increasing pH. At low pH values, acrylamide is present in its protonated form which causes…
When Escherichia coli growing in minimal medium is shifted from 37 C to any temperature in the range 40 to 45 C, the growth rate immediately assumes a new, lower value, characteristic of that temperature. The decrease is shown to be due, in several strains, to decreased activity of the first enzyme of the methionine p…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. Mo/lgaard, W. W. Smeltzer; Thermal Conductivity of Magnetite and Hematite. Journal of Applied…
Some experimental investigations have been made in order to understand the nature of phase transitions in the perovskite-type crystal CsPbCl 3 . Measurements of the birefringence and conoscopic observations confirm three phase transitions occurring at 37°C, 42°C and 47°C, respectively. The crystal system in each phase…
The existence of liquid crystalline order in two dimensions is discussed. It is shown that, contrary to a previous contention, a theory based on the lowest-order approximation to the virial expansion of the free energy (the Onsager limit) indicates that a nematic ordering transition does occur. The effects of the fluc…
Energy transport is investigated in a model system for which exact analytic results can be obtained. The system is an infinite, one-dimensional harmonic crystal which is perfect everywhere except in a finite segment which contains N isotopic defects. Initially, the momenta and displacements of all atoms to the left of…
The concept of windchill as a measure of the combined effects of low temperature and wind is reviewed. An analysis is presented of the effect of these variables on a person dressed for cold climates and takes account of all important modes of heat loss, including breathing and heat transfer through clothing. This anal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility study of various ferricenium and iron(III) dicarbollide compoundsHarry B. Gray, David N. Hendrickson, and Y. S. SohnCite this: Inorg. Chem. 1971, 10, 8, 1559–1563Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Publ…
High-energy radiation simultaneously produces vacancies and interstitials in crystalline materials and, therefore, both types of defects are supersaturated during irradiation. The nucleation of defect precipitates under this circumstance is fundamentally different from the usual nucleation problem because of the compe…
CaSO4:Tm and CaSO4:Dy were found to be free from the serious disadvantage of rapid fading in CaSO4:Mn and yet retain the outstanding property of high sensitivity of CaSO4:Mn, the most sensitive thermoluminescence dosimeter available at present. Glow curves of both CaSO4:Dy and CaSO4:Tm are rather simple showing a main…
The crystal structures of CaMoO4, SrMoO4, SrWO4, and BaWO4 have been refined from neutron diffraction data taken in the (h0l) and (hhl) zones. Oxygen position refinement is started from the parameters proposed by Sillén and Nylander and results in an improvement of over an order of magnitude in the oxygen coordinates.…
Theory for the Urbach-Martienssen (U-M) rule on the low energy tail of the fundamental absorption edge of insulators is proposed. The exciton propagator solved for an adiabatic lattice is averaged for lattice vibrations at finite temperature, and the self-energy of exciton is obtained. It describes two characters of e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and chemical properties of singlet molecular oxygenDavid R. KearnsCite this: Chem. Rev. 1971, 71, 4, 395–427Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.org/doi/10.1021/cr60272a0…
"Nuclear Reactor Theory." Nuclear Science and Engineering, 45(2), pp. 234–235
The temperature dependence of the attenuation of longitudinal hypersonic waves at 9.4 GHz has been measured in 'perfect' specimens of trigonal crystals: quartz, lithium niobate and corundum. It is found that this attenuation follows a T 6.5 -law in the range 0.1<or= alpha (db/cm)<or=5. The results are in good qualitat…
Detailed assignments are given for normal modes of vibration in vitreous silica, germania and beryllium fluoride. They have been obtained by calculating the atomic displacement eigenvectors for selected modes throughout the spectrum, and separating the kinetic energy of these modes into contributions from cation motio…
Abstract The growth kinetics of single crystal lamellae grown from polyisoprene melts have been determined by thin film electron microscopy which also reveals the relevant microstructure. The growth rate of a continuous lamellar crystal is independent of the length of the crystal and (in the absence of crosslinks) dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the nature of the metal-binding sites and estimate of the distance between the metal-binding sites in transferrin using trivalent lanthanide ions as fluorescent probesChun Ka LukCite this: Biochemistry 1971, 10, 15, 2838–2843Publication Date (Print):July 20, 1971Pub…
The wavelength-modulated absorption and reflection spectra of SrTi${\mathrm{O}}_{3}$ have been measured as functions of temperature. Over a 60-K temperature range around the structural phase transition the band gaps of both high- and low-temperature phases are observed simultaneously. This effect and an associated ban…
The mechanism of deformation of the ordered CuAu alloy is investigated using electron microscopy. The alloy deformation is shown to be accomplished by slipping; a larger degree of deformation involves the mechanism of twinning. The interaction between dislocations and the boundaries of 90° -disoriented domains has bee…