Materials Literature
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The anomalously low mobility of collagen peptides on SDS-gel electrophoresis was investigated, using tadpole skin collagen and bovine Type I, II, and III collagens. The free electrophoretic mobility of alpha 1 chains of collagen was found to be smaller than those of alpha 2 chain and common proteins of similar size, w…
Abstract Soil formation as affected by topography and time was studied in highly calcareous parent materials under the semiarid conditions of southern Iran. Soils of the 95,000‐ha Sarvestan basin were considered for this purpose. Topographic features of the Sarvestan basin were related to variations in soil texture an…
Abstract Die Carbonate der Alkalimetalle und einer Reihe von Übergangsmetallen lassen sich darstellen durch Einwirkung von CO 2 unter Drucken zwischen 600 und 4500 at bei Temperaturen zwischen 100 und 400°C auf entsprechende Salzlösungen, Hydroxide oder Oxide. Die auf diese Weise dargestellten Verbindungen MnCO 3 , Fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and Raman spectra of ammonium, potassium, rubidium, and cesium metavanadatesShinji Onodera and Yusaku IkegamiCite this: Inorg. Chem. 1980, 19, 3, 615–618Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue 1 March 198…
The problems relating to the classification of mudrocks, and in particular the role of grain size, are discussed. Classification based on silt-clay proportions is more realistic than a silt-clay-sand system. The grain size, as measured in mudrocks, is an uncertain quantity and the use of the quartz content is advocate…
Sintering kinetics of the system Si 3 N4‐Y2O 3 ‐Al 2 O3 were determined from measurements of the linear shrinkage of pressed disks sintered isothermally at 1500° to 1700°C. Amorphous and crystalline Si 3 N 4 were studied with additions of 4 to 17 wt% Y 2 O 3 and 4 wt% A1 2 O 3 . Sintering occurs by a liquid‐phase mech…
The hydrolytic degradation of polyester urethane elastomers is due to the acid catalyzed hydrolysis of the ester group. Acid content (A) and the reciprocal of the number average molecular weight increase by equivalent amounts indicating that each molecular chain scission produces one acid group. The fractional rate of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin iron(II) in the porphyrin plane. Structural characterization of (meso-tetraphenylporphinato)bis(tetrahydrofuran)iron(II)Christopher A. Reed, Toshio Mashiko, W. Robert Scheidt, K. Spartalian, and George LangCite this: J. Am. Chem. Soc. 1980, 102, 7, 2302–2306Publica…
Abstract Clay mineralogical differences between eight soils in South Island, New Zealand, are related to differences in climate, vegetation, and formation time. Alteration of chlorite follows the sequence chlorite→interlayered hydrousmica→chlorite-swelling chlorite→chlorite-vermiculite, with increased weathering leadi…
Much has been written about the glass transition tem- perature of polyethylene.Recently, this topic has been brought to renewed timeliness through the review of Beatty and Karasz,1 who strongly favor a glass transition temperature of 145 K. Their argument for such a low glass transition temperature in the vicinity of…
Summary A new synthesis of Mg-Al double hydroxides is described, that gives products relatively low (0.8–1.0%) in CO 2 . The general formula [Mg 1−x Al x (OH) 2 ][(OH) x (H 2 O) 0.81−x ] with 0.23 ≤ x ≤ 0.33 is proposed. Cell parameters and thermal data are given. The c -axial length decreases with Al-content; this is…
Eleven porcelain-fused-to-metal bond tests were analyzed for interfacial shear stress distribution using finite-element stress analysis. Stress concentration effects are significant in ten of the 11 tests. A high probability of tensile failure within porcelain or the interfacial region was found in eight of the 11 tes…
For the formation of nonohmic ZnO ceramics based on the system ZnO-Bi 2 O 3 -Sb 2 O 3 , the reactions on heating (→) and on slow cooling (←), 2PY+17ZnO\xleftarrow\xrightarrow950°∼1050°C3X zso +3Bi 2 O 3 [L] \ding"C0, and X zso \xleftarrow\xrightarrow\gtrsim1300°CSP \ding"C1, play important roles, where PY is Zn 2 Bi 3…
Abstract Calibration of the internal and external signals appearing at g eff ∼4 in the electron paramagnetic resonance (EPR) spectra of twenty-four kaolinites, has led to the recognition of two types of kaolinite-iron. The amount of iron associated with the internal signal (I iron) shows good inverse correlations with…
X-ray dichroism is observed in crystalline vanadyl bisacetylacetonate, VO2+.2(C5H7O2)-, near the vanadium K edge in absorption experiments with linearly polarized synchrotron radiation. The Kossel structure is polarized as a result of the symmetries of molecular orbitals in this strongly anisotropic molecule. The exte…
J N Sherwood (ed) 1979 Chichester: John Wiley xxvi + 383 pp price £19.50 It is a common phenomenon that crystals made of essentially spherical molecules, e.g. CCI 4 , undergo several phase transitions as the temperature is raised towards the melting point. The higher temperature phases are usually orientationally diso…
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