Nalidixic Acid-Resistant Mutants of Escherichia coli Deficient in Isocitrate Dehydrogenase
icd Mutants of Escherichia coli K-12, selected for their resistance to nalidixic acid, are deficient in isocitrate dehydrogenase.
Materials Literature
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Synthesis and reactions of novel bridged dicarbollide complexes having electron-deficient carbon atoms
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reactions of novel bridged dicarbollide complexes having electron-deficient carbon atomsM. Frederick Hawthorne and James N. FrancisCite this: Inorg. Chem. 1971, 10, 3, 594–597Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Pu…
Review of magnetic properties of Fe-Ni alloys
During the past two decades, improved understanding of the fundamental magnetic behavior of Fe-Ni alloys has made them one of the most versatile class of soft magnetic materials. No longer is the concern limited to high permeability and low coercfve force at room temperature. Alloys have now been custom-crafted to mee…
I.R. Spectroscopic Evidence for Interaction Between Hydronium ions and Lattice OH Groups in Montmorillonite
Abstract At low levels of hydration, exchangeable D + in montmorillonite interacts with lattice OH groups and quantitatively converts AlMgOH groups to AlMgOD. Hydroxyl groups coordinated to two Al ions undergo a slower exchange, the extent of which is restricted by octahedral Fe 3+ ions. The OH stretching vibration of…
Long‐chain branching in low‐density polyethylene
Abstract A method is given for the analysis of long‐chain branching in polymers by using combined GPC and intrinsic viscosity measurements. A computer program was written to evaluate branching indices by a tabular, iterative method. The method was applied to the evaluation of long‐chain branching in low‐density polyet…
Shear Creep Studies of Narrow-Distribution Poly(cis-isoprene)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear Creep Studies of Narrow-Distribution Poly(cis-isoprene)Norio Nemoto, Motohiro Moriwaki, Hisashi Odani, and Michio KurataCite this: Macromolecules 1971, 4, 2, 215–219Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1…
Technical Note: Effect of Cold Work on Intergranular Corrosion of Sensitized Stainless Steel
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation C. S. TEDMON, D. A. VERMILYEA, D. E. BROECKER; Technical Note Effect of Cold Work on Intergranular Corrosi…
Cooperative Dynamic Jahn-Teller Effect. II. Crystal Distortion in Perovskites
A molecular-field-type theory is given for the second-order phase transitions occurring in perovskite crystals, in which a Jahn-Teller (JT) ion (${\mathrm{Mn}}^{3+}$, ${\mathrm{Cu}}^{2+}$, ${\mathrm{Cr}}^{2+}$) occupies an octahedral $B$ site. The dynamic character of the JT effect is taken into account and excited vi…
X‐Ray Small‐Angle Scattering of Yeast Glyceraldehyde‐3‐phosphate Dehydrogenase as a Function of Saturation with Nicotinamide‐Adenine‐Dinucleotide
Structural changes of yeast glyceraldehyde‐3‐phosphate dehydrogenase as a function of saturation with NAD have been measured with the X‐ray small‐angle scattering technique. Samples of yeast glyceraldehyde‐3‐phosphate dehydrogenase were investigated at pH 8.5 and 40° and five different degrees of saturation with the c…
The fracture toughness and stress corrosion cracking characteristics of an anhydride‐hardened epoxy adhesive
Abstract The toughness and stress corrosion cracking characteristics of an epoxy resin (DER 332) hardened with hexahydrophthalic anhydride (HHPA) were investigated. The epoxy was studied in both the bulk and bond form, and its properties were compared with an amine‐hardened (tetraethylene pentamine, TEPA) system. The…
Mechanism of the Ferroelectric Phase Transformation in Rare-Earth Molybdates
Neutron scattering experiments on ${\mathrm{Tb}}_{2}$ ${(\mathrm{M}\mathrm{o}{\mathrm{O}}_{4})}_{3}$ show the ferroelectric orthorhombic phase to result from a phonon instability at the (\textonehalf{}, \textonehalf{}, 0) Brillouin zone corner of the parent tetragonal phase. Anharmonic coupling to these antiferroelect…
Luminescence of Transition Metal d6 Chelates
Emission and absorption spectra have been determined for Rh(III) and Ir(1II) complexes of the nitrogen ligands, ethylenediamine (en) pyridine, 2,2′-dipyridyl (dip), and 1,10-phenanthroline (phen). Emission lifetimes at 77°K in glassy solution and at room temperature have been measured. From lifetime measurements and t…
The Analysis of Induction Motors with Voltage Control by Symmetrically Triggered Thyristors
The application of thyristor switching to induction motor speed control has resulted in a number of unconventional supply systems. One such technique, which has been successfully employed in a number of applications, is variable voltage control by means of symmetrically triggered thyristors in the stator phases of a w…
Critical Magnetic Scattering inK2NiF4
A detailed study of the static and dynamic critical behavior of the planar antiferromagnet ${\mathrm{K}}_{2}$Ni${\mathrm{F}}_{4}$ is reported. The dynamic experiments reveal several unusual features. Magnons over most of the Brillouin zone are observed to persist well above ${T}_{N}$. The magnons ultimately become uno…
Soft magnetic structural alloys for elevated-temperature applications
Metallurgical efforts to develop a soft magnetic material suitable for application in the rotor of a generator or motor in advanced aerospace electric systems are reviewed. Commercial materials which have been considered include AISI 4340 steel, H-11 steel, Nivco alloy, and 15- and 18-percent Ni maraging steels. Devel…
Holtite: a new mineral allied to dumortierite
Summary Holtite, a new mineral allied to dumortierite, occurred as pebbles with stibiotantalite and tantalite on an alluvial tin lease near Greenbushes, Western Australia, and is named after the late H. E. Holt, Prime Minister of Australia. The mineral is orthorhombic with a 11·905 Å, b 20·355 Å, c 4·690 Å, space grou…
Magnetostrictive phenomena in metallic materials and some of their device applications
The phenomenon of magnetostriction, or the change in a body's dimensions during the magnetization process, was first reported by Joule. Since then, the interaction between strain and the magnetization process has been studied extensively, particularly in the magnetic metals and alloys that have been found to be of tec…
Annealing of defect clusters in irradiated tungsten
Transmission electron microscopy has been used to study the thermal annealing of radiation induced defect clusters in tungsten irradiated at reactor ambient tempeaature, ∼ 70°C. Annealing, consisting of the growth and eventual elimination of the clusters, is observed to occur in two stages, one at temperatures below 4…
Crystal structure of Ca2Na2(CO3)3 (shortite)
Ca, N",(C O"h cr yS la lli ze, in I he o rl hnrhombi c u n il ce ll (f = 4.947( I ) A . /) = I 1.0:)2(2) A. a nd (" = 7. 108 ( 1) A al 2S oC wi lh 111' 1) formul a weip:ll is in s l' aeep:rtlup Am 1ll 2. Th" , Iru e l u re ha s bee n J"( delcrm in ed. ("o ITee l,d. a nd rdined 10 /? ".= 0.02S . /? = 0.020 u s in ~ 684…
Hyperfine Field at the Tin Sites in the Heusler AlloyNi2MnSn
The hyperfine field $H(\mathrm{Sn})$ at the tin sites in ${\mathrm{Ni}}_{2}$MnSn has been measured by means of the M\"ossbauer effect at 300 and 77\ifmmode^\circ\else\textdegree\fi{}K. The results, which are independent of heat treatment, have been extrapolated to 0\ifmmode^\circ\else\textdegree\fi{}K to give a satura…