Materials Literature
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Homonuclear and heteronuclear 2D NMR methods are used to study two triple-helical peptides. One peptide, (POG)10, is considered to be the most stable prototype of a triple helix. The second peptide, (POG)3ITGARGLAGPOG(POG)3 (denoted T3-785), was designed to model an imino acid poor region of collagen and contains 12 r…
Physical properties of zinc oxide films deposited by dual-ion-beam sputtering are analyzed to point out the performance of this technique for the deposition of this material. The films are deposited by sputtering a zinc oxide target with an argon-ion beam, while a second low-energy beam, the assistance ion beam, impin…
A perovskitelike solid solution ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ can be viewed as a hole-doped Mott-Hubbard insulator or strongly correlated metal that is derived from the parent insulator ${\mathrm{YTiO}}_{3}$ with the Mott-Hubbard gap of \ensuremath{…
A reservoir of 9 electrons and 27 protons, complex 1 has 8±1 quasi-equivalent redox centers. It is prepared from [CpFe(η6-mesitylene)]+ by nonaallylation of the three methyl substituents, demetalation, conversion into the corresponding nonaol, and phasetransfer-catalyzed reaction with [CpFe(FC6H4Me)].
Carbon nitride (CNx) thin films were prepared by dc magnetron sputtering of a graphite target in a nitrogen ambient onto Si(100) substrates held at ambient temperatures. The films are amorphous with a small volume fraction of nanocrystallites. All CNx coatings grown to a thickness of 1.5 μm are adherent and smooth. Na…
Thermal expansion coefficients (α a and α c ) in two crystallographic axes ( a and c ) of the tetragonal phase are measured at 25°–1200°C in ZrO 2 –M 2 O 3 (M = Sc, In, Yb) and in ZrO 2 –YTaO 4 . The difference between these two thermal expansion coefficients, α c –α a , decreases with M 2 O 3 or YTaO 4 composition ev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultifunctional macrocyclic ligands. Synthesis and characterization of nickel(II) and cobalt(II) macrocyclic-catechol complexes and their dimeric, antiferromagnetically coupled, semiquinone derivativesDimitri Coucouvanis, Sigridur G. Jonasdottir, Danae Christodoulou, Chang G…
Under actual reactor conditions, the mechanical characteristics of nuclear fuel are particularly affected by thermal expansion of the fuel pellets. The results of an experiment studying the vibration behavior of nuclear fuel under reactor conditions are presented. The experiment was conducted in an experimental reacto…
The lifetime of luminescence in NaCl:${\mathrm{Yb}}^{2+}$ crystals has been investigated using a streak-camera method. Two emission bands peaking at 400 and 432 nm (called bands I and II, respectively) are observed. In addition to a long lifetime of more than 0.3 ms previously observed for band II, it was observed tha…
The cells of the extreme thermophile Thermus thermophilus are surrounded by a regular layer (S-layer) built up by a protein with an apparent molecular mass of 100 kDa (P100). From purified membrane fractions, three different class of two-dimensional crystals can be obtained by following alternative extractive procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic liquid crystals in polypeptides with mesogenic side chains. 1Junji Watanabe and Toshihiko TominagaCite this: Macromolecules 1993, 26, 15, 4032–4036Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polyethers based on conformational isomerism. 32. Effect of molecular weight on the phase behavior of linear and macrocyclic oligoethers and of linear polyethers based on 1-(4-hydroxy-4'-biphenylyl)-2-(4-hydroxyphenyl)butane and 1,10-dibromodecaneVirgil Pe…
Experiments have shown that there may be an optimal grain size which maximizes the toughness of polycrystalline ceramics. In this paper, we attempt to develop a theoretical model which can predict the effect of grain size on the toughness of ceramics. We assume that three principal mechanisms affect the toughness of t…
X-ray structure analyses of crystalline [NMe 4 ][B 5 O 6 (OH) 4 ] · nH 2 O with n ≈ 0.25-0.50 (1), [NEt 4 ][B 5 O 6 (OH) 4 ] (2), [NPhMe 3 ][B 5 O 6 (OH) 4 ] (3), and [pipH][B 5 O 6 (OH) 4 ] (4) reveal that these materials are novel clathrates with closely related three-dimensional host structures built up of hydrogen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction of aluminum hydride-triethylamine complex with selected organic compounds containing representative functional groupsJin Soon Cha and Herbert C. BrownCite this: J. Org. Chem. 1993, 58, 15, 3974–3979Publication Date (Print):July 1, 1993Publication History Published o…
Reduced no-load losses have resulted in increased susceptibility to ferroresonance of grounded wye-wye three-phase distribution transformers using five-leg silicon steel wound cores. The authors describe the results of an extensive test program which determined that overvoltages are directly related to the ratio of ca…
Abstract To better understand fabrics in dolomitized carbonates, aragonitic ooids were replaced with dolomite in laboratory experiments. Recent ooids from Cat Cay were reacted in a solution of 0.5 M MgCl 2 and 0.4 M CaCl 2 in Teflon-lined stainless steel bombs at 200 degrees C and equilibrium vapor pressure. X-ray dif…
α‐C 2 SH can be synthesized by hydrothermal treatment of lime and silicic acid for 2 h at 200°C. When heated to 390–490°C, α‐C 2 SH dissociates through a two‐step process to form an intermediate phase plus some γ‐C 2 S. This appears to be a new dicalcium silicate different from known dicalcium silicates—α, α′ L , α′ H…
Abstract The linear electro‐optic (Pockels) effect in a series of alkali metal acid phthalate crystals has been studied. Single electro‐optic coefficients r and r for sodium (NaAP), potassium (KAP) and rubidium (RbAP) acid phthalates have been measured by employing the modified Mach–Zehnder interferometric technique.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAminosilanes in organic synthesis. Preparation of new expanded porphyrin ligands and bimetallic transition-metal complexes. Crystal structure of a tetrapyrrole macrocycle dirhodium complexF. H. Carre, R. J. P. Corriu, Geng Bolin, J. J. E. Moreau, and C. VernhetCite this: Org…