Materials Literature
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ABSTRACT Pterosperma cristatum Schiller, a member of the Pra‐sinophyceae, was examined with light and electron microscopy with special attention on the absolute configuration of flagellar apparatus components and associated structures. This alga is characterized by asymmetrically arranged basal bodies, connecting fibe…
Abstract A new type of multicomponent thermoplastic elastomers is prepared by attaching 4‐(3,5‐dioxo‐1,2,4‐triazolin‐4‐yl)benzoic acid to polybutadiene chains. The groups are difunctional with respect to a potential chain‐molecule formation via reversible association. Thus, a covalent polymer is combined with an assoc…
Gadolinium-DTPA (Gd-DTPA) liposomes have been studied previously as liver contrast agents and have been shown to improve the detection of hepatic metastases in rats. We synthesized 100-nm and 50-nm liposomes that encapsulated Gd-DTPA and did biodistribution and clearance studies in rats. Parallel magnetic resonance im…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and spectroscopic properties of five-coordinate (2-methylimidazolato)- and six-coordinate (imidazole)(imidazolato)iron(II) "picket-fence" porphyrinsD. Mandon, F. Ott-Woelfel, J. Fischer, R. Weiss, E. Bill, and A. X. TrautweinCite this: Inorg. Chem. 1990, 29, 13, 24…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSwitching between solid-state electroactivity, coupled with ionic conductivity, and semiconducting or dielectric properties in dry mixed-metal hexacyanoferrate powdersPawel J. KuleszaCite this: Inorg. Chem. 1990, 29, 13, 2395–2397Publication Date (Print):June 1, 1990Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of dielectric and viscoelastic relaxation spectra of polyisopreneKeiichiro Adachi, Hirotsugu Yoshida, Fumiaki Fukui, and Tadao KotakaCite this: Macromolecules 1990, 23, 12, 3138–3144Publication Date (Print):June 1, 1990Publication History Published online1 May 200…
The optical transmission of transparent polycrystaliine La 2 O 3 strengthened Y 2 O 3 was measured in both the near‐ultraviolet and infrared regions at temperatures between 20° and 1400°C. The absorption remains low until about 900°C, but rises almost exponentially thereafter. The magnitude of this increase is a funct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy-driven swelling of a polymer brushHugh R. Brown, K. Char, and V. R. DelineCite this: Macromolecules 1990, 23, 13, 3383–3385Publication Date (Print):June 1, 1990Publication History Published online1 May 2002Published inissue 1 June 1990https://pubs.acs.org/doi/10.102…
Un modele de formation de molecules chaines carbonnees, incluant les especes C 2n H, C n S, HC 2n+1 N (n=1-3) et SiC n (n=1-4), est developpe pour l'enveloppe circumstellaire de l'etoile carbonee de type avance IRC+10216 (CW Leo).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and magnetic properties of a reactive complex containing a nearly linear MnIII-O-MnIII core, bis[N,N-bis(5-nitrosalicylidene)-1,7-diamino-3-azapentanato(2-)]oxodimanganeseCary A. Kipke, Michael J. Scott, Joel W. Gohdes, and William H. ArmstrongCite this…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXPS and EXAFS studies of the reactions of cobalt(III) ammine complexes with gallium arsenide surfacesBruce J. Tufts, Ian L. Abrahams, Catherine E. Caley, Sharon R. Lunt, Gordon M. Miskelly, Michael J. Sailor, Patrick G. Santangelo, Nathan S. Lewis, A. Lawrence Roe, and Keith…
Abstract The existence of a heteropoly 18-molybdopyrophosphate was ascertained in both solid and solution states. The yellow complex was formed in solutions of 0.05 M (M=mol dm−3) Mo(VI)/5×10−3 M pyrophosphate/0.1–0.7 M HCl/60% (v/v) CH3CN at ambient temperatures, being isolated as tetraalkylammonium (R4N+) salts wher…
The effect of gamma-radiation on the surface chemical properties of polystyrene was studied by ESCA and FT-IR. Gamma-radiation produces surface >C=O and C-O containing functional groups only, and also causes oxidation to depths >10 nm as detected by ESCA. FT-IR spectra showed that below the top few molecular lay…
Abstract Structure, morphology, and chemical composition of illite/smectite (I/S) containing 30–50% smectite layers (% S) from Kinnekulle bentonites, Sweden, of diagenetic origin were examined using X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). Interlayer arrangements of I/S changed from r…
ABSTRACT Changes in cell size and silica content were examined in response to aluminum additions in cultures of the acidophilic diatom Asterionella ralfsii var. americana Körn at pH 6.0. The effects of Al were examined over a range of steady‐state growth rates using silica‐limited semicontinuous cultures (Si:P = 8.0).…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS study of the carbon monoxide adsorption-induced morphology change in ruthenium clusters supported on aluminaTakanori. Mizushima, Kazuyuki. Tohji, Yasuo. Udagawa, and Akifumi. UenoCite this: J. Phys. Chem. 1990, 94, 12, 4980–4985Publication Date (Print):June 1, 1990Publ…
Previous measurements of refractive index vs wavelength for cubic zirconia were extended to include the variation of index with Y(2)O(3) stabilizer concentration. It was found that a three-term Sellmeier formula fits the index data for each concentration to within ~1 x 10(-4) and that the Sellmeier constants have a no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and magnetic properties of binuclear iron(III) complexes with oxalate, 2,5-dihydroxy-1,4-benzoquinone dianion, and squarate as bridging ligands. Crystal structure of (.mu.-1,3-squarato)bis[(N,N'-ethylenebis(salicylideneaminato))(methanol)iron(III)]Francesc Lloret,…
Abstract Six clays from volcanic ash soils at different stages of weathering differ in their relative halloysite content with respect to kaolinite and several surface properties, namely CEC, and exchange selectivity for K + . These three parameters are related to each other in that they all decrease with increasing so…
The first-order phase transition between paraelectric SmA and antiferroelectric SmC A * phases has been observed for the first time in ( S )-4-(1-trifluoromethylheptyloxycarbonyl)phenyl 4-(5-dodecyloxypyrimidin-2-yl)benzoate (TFMHPDOPB). Three pieces of evidence for the first-order phase transition are shown by means…