Akimitsu SANO、T. Kuriki、Yoshiaki Kawashimà 等 6 位作者1990-01-01Chemical and Pharmaceutical Bulletin
With the objective of modifying the micromeritic properties of tolbutamide (i.e., to manufacture a highly functional powder form), particle design was attempted using a quasi-emulsion solvent diffusion (QESD) method, and the micromeritic properties and dissolution rate of the obtained spherical agglomerates were evalu…
Drug Solubulity and Delivery SystemsCrystallization and Solubility StudiesThermal and Kinetic Analysis
Z. Xia、Z. Szklarska‐Śmiałowska1990-01-01CORROSION
The chemical composition and morphology of corrosion products accumulated on the internal surfaces of admiralty brass tubes and in pits, formed during service of a power plant condenser cooled with brackish water, were examined and compared with corrosion products formed under laboratory conditions simulating those in…
Corrosion Behavior and InhibitionAluminum Alloy Microstructure PropertiesMetallurgy and Material Science
S. Cortés、E. Brücher、Carlos F. G. C. Geraldes 等 4 位作者1990-01-01Inorganic Chemistry
A new chelating macrocycle, 1,5,9-triazacyclododecane-N,N’,N’’-triacetiacc id (DOTRA), has been synthesized, and its complexes \nwith Zn2’, Cd2+, Ca2+, Mg2+, and Mn2+ have been examined by potentiometry and NMR spectroscopy. The first protonation \nconstant of the free ligand (log K, = 12.8) was determined spe…
Radioactive element chemistry and processingLanthanide and Transition Metal ComplexesChemical Reaction Mechanisms
Ettore Benedetti、Benedetto Di Blasio、Vincenzo Pavone 等 9 位作者1990-01-01Journal of the Chemical Society Perkin Transactions 2
A crystal-state structutal analysis of pBrBz-(Aib-LAla)5-OMe tetrahydrate and pBrBz-(Aib-L-Ala)6-OMe dihydrate has been performed by X-ray diffraction. The decapeptide and dodecapeptide molecules are both basically α-helical with five and seven 1 â†� 5 intramolecular H-bonds, respectively. A similarity between the two…
Protein Structure and DynamicsCarbohydrate Chemistry and SynthesisEnzyme Structure and Function
Nobuyuki Tamaoki、Ken’ichi Koseki、Tsuguo Yamaoka1990-01-01Angewandte Chemie International Edition in English
The long sought after [2,2]azobenzenophane 1 has been prepared quite simply by reduction of l,2-bis(4-nitrophenyl)ethane. According to 1H-NMR and UV/VIS spectra the CNNC moiety in 1 is noticeably bent. Photochemically generated cis,cis-1 isomerizes 10000 times more slowly to the trans,trans-form than does the cis,t…
Photochromic and Fluorescence ChemistryAxial and Atropisomeric Chirality SynthesisSynthesis and Characterization of Heterocyclic Compounds
Sriram Vemuri、Cheng-Der Yu、Vuthichai Wangsatorntanakun 等 4 位作者1990-01-01Drug Development and Industrial Pharmacy
Liposomes can be produced by a variety of techniques such as sonication, high-pressure homogenization, detergent dialysis, reverse-phase evaporation and ether injection. The Microfluidizer is a high-pressure homogenizer which is capable of making small size multilamellar vesicles. The mean vesicle size of the liposome…
Nanoparticle-Based Drug Delivery
I. Drevenšek、Igor Muševič、Martin Čopič1990-01-01Physical Review A
The temperature dependence and dispersion relation of phason and amplitudon relaxation times were measured in Sm-A and Sm-${C}^{\mathrm{*}}$ phases of the ferroelectric liquid crystal S-(+)-[4-(2'-methylbutyl) phenyl 4'-n-octylbiphenyl-4-carboxylate] (CE8) by photon correlation spectroscopy. In the Sm-A phase both mod…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic CompoundsMolecular spectroscopy and chirality
R. Srinivasan、Bodil Braren、Kelly G. Casey1990-01-01Pure and Applied Chemistry
Abstract
Diamond and Carbon-based Materials ResearchLaser Material Processing TechniquesLaser-induced spectroscopy and plasma
Claudio Ercolani、A. Paoletti、Giovanna Pennesi 等 6 位作者1990-01-01Journal of the Chemical Society Dalton Transactions
{5,5′;19,19′-Bi[phthalocyaninato(2–)]}titanium(IV)–1-chloronaphthalene(1/1 ), [TiL]·C10H7Cl, is obtained by the reaction of [Ti(pc)Cl2](pc = phthalocyaninato dianion, [C32H16N8]2–) with Na2(pc) in 1-chloronaphthalene at 190 °C, An X-ray single-crystal structure (monoclinic, space group C/2c, a= 16.327(3), b= 18.568(4)…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Dominique Ausserré、D. Chatenay、G. Coulon 等 4 位作者1990-01-01Journal de physique
Quenching experiments on very thin films (≃ 1 000 Å) of symmetric diblock copolymer deposited on solid substrates result in the formation of circular relief domains at the free surface of the sample. It is due to the quantization of the possible thicknesses of the sample which accompanies the lamellar ordering of the…
Solidification and crystal growth phenomenaBlock Copolymer Self-AssemblyFluid Dynamics and Thin Films
Jeremy K. Cockcroft、Andrew N. Fitch1990-01-01Zeitschrift für Kristallographie
Powder neutron diffraction studies confirm that D 2 S has 3 solid-state phases at ambient pressure. Phases I and II are cubic and orientationally disordered with space groups Fm [unk] m ( a = 5.8486(8) Å at 160 K) and P a [unk] ( a = 5.7647(6) Å at 120 K), respectively. The deuterium scattering density arising from th…
Crystal Structures and PropertiesSolid-state spectroscopy and crystallographyInorganic Chemistry and Materials
Pedro Palanca、Teresa Picher、Vicente Claramonte Sanz 等 7 位作者1990-01-01Journal of the Chemical Society Chemical Communications
[NH4]2[MoO2{O2CC(S)Ph2}2]middot;2H2O has been prepared and its crystal structure solved, providing the first example of a co-ordinatively saturated molybdenum complex which reacts readily and reversibly with organophosphines at room temperature in water or methanol; its variable-temperature 13C{1H} NMR spectra and ele…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsMetalloenzymes and iron-sulfur proteins
Taira Okamoto1990-01-01ISIJ International
On joining of metals to ceramics, chemical reaction at the bonding interfaces is unavoidable in most of the combinations of ceramics and metals including brazes except for a few special cases. Thermodynamic possibility of the chemical reaction and the resulted interfacial structure are compared with the experimental r…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesMaterial Properties and Applications
Nathaniel W. Alcock、Magdalena Dudek、Ryszard Gryboś 等 6 位作者1990-01-01Journal of the Chemical Society Dalton Transactions
The complex anion obtained by crystallisation from an aqueous solution of molybdate and citric acid (H3cit) at pH ca. 3 is of the type (i), [(MoO2)4O3(cit)2]4−, as determined by X-ray analysis of the salt K4[Mo4O11(cit)2]·6H2O. Principal dimensions [ranges or means; estimated standard deviation (e.s.d.) 0.005 Å] are:…
Metal complexes synthesis and propertiesPolyoxometalates: Synthesis and ApplicationsChromium effects and bioremediation
F. Abbattista、A. Delmastro、Giuseppe Gozzelino 等 7 位作者1990-01-01Journal of the Chemical Society Faraday Transactions
High-surface-area amorphous Al2O3–AlPO4 samples (P/Al ratio: 0–0.17) have been prepared by reductive decomposition of aluminium nitrate in the presence of phosphoric acid. The materials obtained are amorphous up to 1100–1200 K and present “zeolitic-type” monomodal microporosity (r= 10–15 Å). They are weakly acidic. Th…
Zeolite Catalysis and SynthesisGlass properties and applicationsMesoporous Materials and Catalysis
Fabio Corazza、Carlo Floriani、Angiola Chiesi‐Villa 等 4 位作者1990-01-01Journal of the Chemical Society Chemical Communications
Reaction of MCl5(M = Nb or Ta) with p-butylcalix[4]arene, L-(OH)4, led, depending on the reaction conditions, either to mononuclear complexes [(AcO)–L–(O)3MCl2], or, in the case of niobium only, to the tetranuclear complex [{µ-L-(O)4}2Nb4O2Cl8], characterized by X-ray analysis.
Organometallic Complex Synthesis and CatalysisLanthanide and Transition Metal ComplexesPolyoxometalates: Synthesis and Applications
Ehud Keinan、Subhash C. Sinha、Anjana Sinha-Bagchi 等 7 位作者1990-01-01Pure and Applied Chemistry
Abstract
Advanced biosensing and bioanalysis techniquesPorphyrin and Phthalocyanine ChemistryMonoclonal and Polyclonal Antibodies Research
A.S. Kim、F.E. Camp、E.J. Dulis1990-01-01IEEE Transactions on Magnetics
The corrosion rate of Nd-Fe-B magnets is found to vary with O, C, and N contents. The corrosion rate rapidly decreases with increasing oxygen content and reaches the minimum when the oxygen content is between 0.6 and 1.2%. The corrosion rate rapidly decreases as the carbon content increases up to about 0.06% and then…
Magnetic and transport properties of perovskites and related materialsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
T. Gutwald、Alfons Mersmann1990-01-01Chemical Engineering & Technology
Abstract A new laboratory plant for batch cooling crystallization is described, which allows to maintain the supersaturation at a constant level during an experimental run. A method for continuous supersaturation measurements has been developed, using a density meter and a hydrocyclone. Experimental results obtained f…
Crystallization and Solubility Studiesnanoparticles nucleation surface interactionsFreezing and Crystallization Processes
Christopher C. Parrish、Peter J. Wangersky1990-01-01Journal of Plankton Research
Traditionally, laboratory study of phytoplankton ecology and physiology has been performed in batch cultures. Such cultures are also commonly used when phytoplankton are needed as a food supply for herbivores in an experimental or aquaculture setting. The great advantage of batch culture is its simplicity; however, in…
Diatoms and Algae Research