Materials Literature
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Structured polymer fibers with diameters down to tens of nanometers are of interest for applications in filters, in composite reinforcement, or as templates for the preparation of functional nanotubes. The Figure shows fibers of poly-L-lactide produced by electrospinning from a dichloromethane solution exhibiting regu…
Covering: 1950–2000. p
Today, tissue engineers are attempting to engineer virtually every human tissue. Potential tissue-engineered products include cartilage, bone, heart valves, nerves, muscle, bladder, liver, etc. Tissue engineering techniques generally require the use of a porous scaffold, which serves as a three-dimensional template fo…
An essential step in macromolecular refinement is the selection of model parameters which give as good a description of the experimental data as possible while retaining a realistic data-to-parameter ratio. This is particularly true of the choice of atomic displacement parameters, where the move from individual isotro…
Patterned nanowire networks of photoluminescent highly crystalline ZnO nanowires (see Figure) have been produced via the vapor–liquid–solid mechanism using gold as catalyst. The diameters of the nanowires can be controlled by varying the thickness of the gold layer. The size of the wires has an influence on their emis…
Covering basic physical concepts, experimental methods, and applications, this book is an indispensable text on the fascinating science of magnetism, and an invaluable source of practical reference data. Accessible, authoritative, and assuming undergraduate familiarity with vectors, electromagnetism and quantum mechan…
The main chemical aspects of the preparation of thin copper films from the vapour of monovalent and divalent copper derivatives as precursors in the CVD technique are considered. Data on the methods of synthesis and the properties of various types of these compounds are generalised and described systematically. The po…
(opens in new window) Buy Article (opens in new window) Permissions and Reprints (opens in new window) All articles of this category (opens in new window) Epoxidation of 2,2-dimethylchromene derivatives using achiral (salen)manganese(III) complexes as catalysts in the presence of (-)-sparteine was found to proceed ena…
Esta pesquisa foi desenvolvida com o objetivo de avaliar a viabilidade de utilização da madeira de Eucalyptus maculata, E. grandis e E. tereticornis, na forma de resíduos de processamento em serrarias, para produção de painéis de madeira aglomerada. Foram produzidos 24 painéis, para um total de oito tratamentos defini…
Biologically Active Polymers Polymeric Matrices Liposomes Interactions between Polymeric Drug Delivery Systems and Biological Systems: Barriers and Opportunities PGG-Glucans: A Novel Class of Macrophage-Activating Immunomodulators A New *b-Glucan-Based Macrophage-Targeted Adjuvant Fluorescent Labeling of Heparins and…
Chlorins provide the basis for plant photosynthesis, but synthetic model systems have generally\nemployed porphyrins as surrogates due to the unavailability of suitable chlorin building blocks.\nWe have adapted a route pioneered by Battersby to gain access to chlorins that bear two meso\nsubstituents, a geminal dimeth…
The synthesis, X-ray structure, and NMR ( 1 H, 13 C, 17 O) and magnetic characterization of the complexes [Co(CO) 2 (tmpo)] ( 1 ) and [Co 4 O(OOCNC 9 H 18 ) 6 ] ( 2 ) are reported. Reaction of Co 2 (CO) 8 in the presence of a 4-fold excess of tmpo yields in a few minutes the blue carbamato complex 2 in >80% yield. The…
Chronoamperometry has been undertaken at insonated electrodes of both micro and macro dimensions, for a range of simple, well-defined redox couples in water (298 K), DMF (298 and 218 K), and ammonia (218 K) as solvents. These are analyzed to assess the relative contributions of acoustic streaming and cavitational acti…
An efficient and versatile synthesis of a series of polymerizable amphiphilic mesogens that affords control over tail length and position of the polymerizable group is described. The synthesis employs a novel and facile method of preparing styrene ethers. The monomers are sodium salts of styrene ether-modified fatty a…
Two novel blue luminescent bridging ligands N,N,N',N'-tetra(2-pyridyl)-1,4-phenylenediamine (tppd) and N,N,N',N'-tetra(2-pyridyl)-1,1-biphenyl-4,4'-diamine (tpbpd) have been synthesized. Several novel lanthanide complexes containing 2,2',2"-tripyridylamine (2,2',2"-tpa), 2,2',3"-tpa, tppd, or tpbpd ligands have been s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnolization and Aldol Reactions of Ketone with a La3+-Immobilized Organic Solid in Water. A Microporous Enolase MimicTakehisa Dewa, Toshiyuki Saiki, and Yasuhiro AoyamaView Author Information CREST, Japan Science and Technology Corporation (JST) and Institute for Funda…
The Class I and III polyhydroxybutyrate (PHB) synthases from Ralstonia eutropha and Chromatium vinosum, respectively, catalyze the polymerization of beta-hydroxybutyryl-coenzyme A (HBCoA) to generate PHB. These synthases have different molecular weights, subunit composition, and kinetic properties. Recent studies with…
Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of ${\mathrm{La}}_{0.75}{\mathrm{Ca}}_{0.25}{\mathrm{MnO}}_{3}$ and ${\mathrm{Nd}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}.$ We found that the residual resistivity ${\ensuremath{\rho}}_{o}$ increases by about…
ADVERTISEMENT RETURN TO ISSUEPREVNoteMolecular Weight Dependence of Alternate Adsorption through Charge-Transfer InteractionYuzuru Shimazaki, Ryo Nakamura, Shinzaburo Ito, and Masahide YamamotoView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo, Kyoto 606-85…
The effects of Cr substitution on Mn sites in the colossal magnetoresistance (CMR) compound ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ have been studied by preparing the series ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3} (x<~0.3).$ A c…