Materials Literature
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Many of the outstanding properties in oxides are related to materials with an intrinsic nanoscaled local structure, where the different regions are characterized by competing chemical, structural, and/or physical properties. One of the major challenges in the analysis of the nanoscaled oxides is experimental access to…
We have performed ab initio calculations within the density-functional theory for Ga_{1-x}Mn_xAs diluted semiconductors. Total energy results unambiguously show that a quasi-localized down-spin hole, with strong p-like character, surrounds the fully polarized Mn up-spin d^5-electrons. Calculations indicate that the ho…
We present high resolution two-photon excitation microscopy studies combining two-photon fluorescence (TPF) and second harmonic generation (SHG) in order to probe orientational distributions of molecular ensembles at room temperature. A detailed polarization analysis of TPF and SHG signals is used in order to unravel…
The Fifth Edition of Principles of Polymer Systems has been completely revised and updated. The chemical engineering perspective has been retained and strengthened, and the broad applications of polymers in chemistry and materials science have been addressed. The theoretical basis for various topics has been deepened…
Synthetic pargasite with near end-member cation stoichiometry (X F = F/((OH) + F) = 0) and natural, gem-quality fluoropargasite from Sri Lanka (X F = 0.605) have been studied by high-temperature lead-borate drop-solution calorimetry under dynamic measuring conditions in flowing Ar. IR-spectroscopy shows that both samp…
Electronic structures of very dilute Cr- or Ru-doped ${\mathrm{Nd}}_{1/2}{A}_{1/2}{\mathrm{MnO}}_{3}$ (NAMO) $(A=\mathrm{Ca},\mathrm{Sr})$ manganites have been investigated using the Mn and Cr $2\stackrel{\ensuremath{\rightarrow}}{p}3d$ resonant photoemission spectroscopy (PES). All the Cr- and Ru-doped NAMO systems e…
A revision of the monoraphid pennate diatom genus Campyloneis Grunow was carried out based on LM and EM observations. The material examined originated from various herbarium collections and from extant epiphytic diatom communities on leaves of Posidonia spp. We also examined the generitype C. grevillei (Smith) Grunow…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract A fine crystal MoS2 has been synthesized by hydrothermal method in a clean and efficient system consisting of Na2MoO4 and KSCN in a short time (24 h). The product is characterized by XRD and TEM, and the ED pattern reveals a hexagonal crystal. The mechanism of this reaction is also put forward. Thus this meth…
This study deals with the radiation-induced defects in fracture filling clay-minerals from the El Berrocal U-deposit (Spain), which is considered as a natural analogue of a high-level nuclear waste repository in granitic rock. Mineralogical analyses shows the widespread occurrence of dickite as a secondary alteration…
Lipase-catalyzed polymerization of caprolactone (CL) in toluene with methoxy-poly(ethylene glycol) (MPEG) and water as initiators was characterized in detail for mechanistic insight. (1)H NMR analysis of polycaprolactone chains (PCL), dicaprolactone, degree of esterification of MPEG, and fractions of PCL chains initia…
Abstract A combination of NMR and matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry (MALDI‐TOF) techniques were suitable tools for examining the exchange reactions that occur during the melt‐mixing of nylon‐6 and poly(ethylene terephthalate) (Ny6/PET) blends in the presence of p‐toluene sulf…
The continuous production of chitosan oligosaccharides using a packed-bed enzyme reactor was investigated as to the effects of the operation conditions on the yield of pentamers and hexamers of chitosan oligosaccharides. A column reactor packed with immobilized chitosanases prepared by the multipoint attachment method…
We have measured the thermoelectric signal along the a axis in (TMTSF)2PF6 at 10 kbar as a function of the orientation of the applied magnetic field. Resonantlike Nernst signals were found with a dramatic sign change as the field was rotated through the "Lebed magic angles." The sign change indicates that the electric…
Abstract For Abstract see ChemInform Abstract in Full Text.
The phylogeny of the green algal Order Dasycladales was inferred by maximum parsimony and Bayesian analyses of chloroplast‐encoded rbc L sequence data. Bayesian analysis suggested that the tribe Acetabularieae is monophyletic but that some genera within the tribe, such as Acetabularia Lamouroux and Polyphysa Lamouroux…
Abstract α-Fe2O3 nanowires were prepared using mesoporous silica SBA-15 as a template and showed a remarkable catalytic activity for the hydroxylation of phenol with 30% H2O2 in aqueous solution at 343 K.
The crystals of lamprophyllite-2 M and lamprophyllite-2 O were found coexisting in an ussingite-microcline-sodalite veins in the Alluaiv Mt., Lovozero alkaline massif, in association with ussingite, aegirine, microcline, sodalite, albite, mangan- neptunite, vuonnemite, sphalerite, lomonosovite and betalomonosovite. Th…
Two types of push-pull chromophores built around thiophene-based pi-conjugating spacers rigidified by either covalent bonds or noncovalent intramolecular interactions have been analysed by means of IR and Raman spectroscopical measurements in the solid state as well as in a variety of solvents. Comparison of the Raman…
In mature collagen type III the homotrimer is C-terminally cross-linked by an interchain cystine knot consisting of three disulfide bridges of unknown connectivity. This cystine knot with two adjacent cysteine residues on each of the three alpha chains has recently been used for the synthesis and expression of model h…