Materials Literature
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PURPOSE: This experimental study was designed to investigate the collagen fibrils of colonic anastomoses in rats and to compare normal healing with rats treated with biosynthetic growth hormone (bGH). METHODS: The healing zone of left colonic anastomoses was studied at days 2, 4, and 6 after surgery by means of scanni…
In this work we have studied the vibrational (relaxation) contributions beta(r) and gamma(r) to molecular nonlinear optical (nlo) properties of polyenovanillins, a class of push-pull molecules with increasing number n of conjugated CC bonds (n = 1, 3, 4, 5). Both experiments and ab initio calculations have been carrie…
The longitudinal (LA) and transverse (TA) Brillouin spectra along [001] phonon direction have been measured as a function of temperature (50–475 K) in single-crystal PbMg1/3Nb2/3O3 with scattering angles θs=180° and 32.5±0.2°. The Brillouin frequency shift with decreasing temperature shows a broad softening anomaly fo…
Several neutral solutes, ranging in size from methanol to a tetrasaccharide, stachyose, are shown to stabilize the left-handed Z form of the methylated polynucleotide poly(dG-m5dC). The action of these solutes is consistent with an osmotic stress, that is, with their effect on water chemical potentials coupled to a di…
We present an experimental study of the transformation avalanches taking place during a thermally induced thermoelastic martensitic phase transition of a Cu-Zn-Al alloy. We have studied the statistical distribution of amplitudes and durations of the acoustic emission signals released in the avalanches and found them t…
We introduce a mean field model that allows us to determine the interfacial behavior of AB random copolymers. Through this model, we calculate the reduction in interfacial tension \ensuremath{\gamma} that occurs when the random copolymers localize at the interface between immiscible homopolymers A and B. We also isola…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility and Thermal and Crystallization Behaviors of Poly(D-(-)-3-hydroxybutyrate)/Atactic Poly(methyl methacrylate) BlendsA. Siciliano, A. Seves, T. De Marco, S. Cimmino, E. Martuscelli, and C. SilvestreCite this: Macromolecules 1995, 28, 24, 8065–8072Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Properties of Poly(2,5-di-n-dodecyl-1,4-phenylene) Depending on Chain LengthT. F. McCarthy, H. Witteler, T. Pakula, and G. WegnerCite this: Macromolecules 1995, 28, 24, 8350–8362Publication Date (Print):November 1, 1995Publication History Published online1 May…
The effect of thermally induced microcracks on the fracture toughness and fractal dimension of fully crystalline lithia disilicate glass‐ceramics was studied. The fracture toughness, K IC , for the nonmicrocracked lithia disilicate, 3.02 ± 0.12 MPa·m 1/2 , was significantly greater than the value of 1.31 ± 0.05 MPa·m…
The light scattering spectra of several recently investigated glass-forming systems are reanalyzed. The analysis shows that for both fragile and nonfragile glass-forming liquids, there is some general scenario for the dynamics at high temperatures that seems to follow the qualitative scenario suggested by the mode-cou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleHeteropolyagostic Interactions in Lanthanide(III) Diisopropylamido ComplexesWilliam J. Evans, Reiner Anwander, Joseph W. Ziller, and Saeed I. KhanCite this: Inorg. Chem. 1995, 34, 23, 5927–5930Publication Date (Print):November 1, 1995Publication History Published online1 May 200…
We report the first measurement of giant magnetoresistance at 10 GHz in a bulk ceramic sample of Nd 0.7 Sr 0.3 MnO 3 . From the surface resistance data, we deduce that the magnetoresistance, [ϱ μW (0)−ϱ μW ( B )]/ϱ μW (0) at 1.2 T, has a peak value of approximately 90% at 215 K. The microwave studies are supplemented…
Simple complementation assay systems were developed for the substrate-specific proteins PB of glycine reductase, sarcosine reductase, and betaine reductase, in which acetyl phosphate was detected as the product in all three cases. The betaine-specific subunits of protein B (PB betaine) responsible for betaine reductas…
Hexacyanometalates [BIII(CN)6)]3- react with Lewis acids [AL]2+ or A2+ to give either oligonuclear complexes with high-spin ground states [BIII(CN-AIIL)6)]9+ or three-dimensional (3D) networks with variable Curie temperature TC. We report the magnetic properties of (i) an heptanuclenr complex [Cr(CN-Ni(tetren)6](ClO4)…
Silicon clusters have been generated by CO2-laser-induced decomposition of SiH4 in a flow reactor. By introducing a conical nozzle into the reaction zone, they are extracted into a molecular beam apparatus and analyzed with a time-of-flight mass spectrometer. The mass spectra show that the cluster source emits, beside…
New experiments on a well known compound, a dodecanuclear manganese cluster of formula [Mn12O12(CH3COO)16(H2O)4, are providing very exciting results. Recently this cluster was shown to have a huge magnetic anisotropy of the Ising type which, associated to the large spin of the ground state, S=10, is responsible of an…
Escherichia coli galactoside acetyltransferase (GAT) is a member of a large family of acetyltransferases that O-acetylate dissimilar substrates but share limited sequence homology. Steady-state kinetic analysis of over-expressed GAT demonstrated that it accepted a range of substrates, including glucosides and lactosid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Electrically Conducting Polyester That Has Isolated Quatrathiophene Units in the Main ChainYaoliang Hong and Larry L. MillerCite this: Chem. Mater. 1995, 7, 11, 1999–2000Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEuropium Pyridinethiolates: Synthesis, Structure, and ThermolysisM. Berardini and J. BrennanCite this: Inorg. Chem. 1995, 34, 24, 6179–6185Publication Date (Print):November 1, 1995Publication History Published online1 May 2002Published inissue 1 November 1995https://pubs.acs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, Reactivity and Molecular Structures of RSRS-[Ni(tmc)SC6H5](PF6), RRSS-[Ni(tmc)SC6H5](CF3SO3) and RRSS-[Ni(tmc)](CF3SO3) (tmc = 1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradecane)M. S. Ram, Charles G. Riordan, Robert Ostrander, and Arnold L. RheingoldCite this:…