Materials Literature
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Quaternized poly(propylene imine) dendrimers have been prepared and investigated for their ability to function as pH-responsive controlled-release systems. These functionalized dendrimers are able to solubilize pyrene due to charge transfer complexation between the probe and the tertiary amino groups of the dendrimeri…
Second harmonic generation in CdSe nanocrystal quantum dots is observed by Hyper-Rayleigh scattering. The size dependence of the first hyperpolarizibility β was investigated for the nanocrystals in solution. The value of β per nanocrystal decreases with size down to approximately 13 Å in radius. An increase is observe…
YBCO films were successfully prepared on biaxially textured Ag{110}<211> substrates by using pulsed laser deposition. X-ray diffraction results showed that the degree of preferential orientation of Ag{110}<211> substrates varied with increasing annealing temperature. With a thin template layer deposited at low tempera…
We briefly discuss how the wetting properties of a fluid/solid interface can indirectly influence the diffusion properties of fluid confined between two solid walls. This influence is related to the variability of the hydrodynamic boundary conditions at the interface, which correlates to the wetting properties.
Two different porous hydrogen-bonded networks are formed by self-assembly of the radially substituted host 1. In the network of type A, formed by 1⋅4 Et2O, all OH groups of 1 are involved in hydrogen bonding, and the molecular sheets are stacked without translation to generate extended channels that accommodate the Et…
The structure and the conformational equilibria in aqueous and methanolic solutions of YbDOTMA (DOTMA = (1R,4R,7R,10R)-α,α′,α′′,α′′′′-tetramethyl-1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) are investigated and the dynamics studied by means of NMR methods. The presence of two isomeric forms in slow excha…
Bacterial genes responsible for poly(3-hydroxybutyrate) (PHB) biosynthesis were targeted to plant peroxisomes by adding a carboxy-terminal targeting sequence. The enzymes evidently were transported into peroxisomes, retained their catalytic activity, and reacted with peroxisomally available precursors because PHB synt…
A new dendritic cobalt phthalocyanine has been prepared from a phthalocyanine core by a combination of convergent and divergent synthetic approaches. The dendritic cobalt phthalocyanine serves as an effective catalyst for the thiol oxidation, and the stability of the catalyst is enhanced by the encapsulation with the…
In this work, electrical properties of porous silicon structures, formed with electrochemical anodization in HF acid solution under two different current densities, were investigated. In these experiments, Sb doped (111)-oriented n-type silicon samples with 0.006-0.015 W cm resistivity was used. Samples were anodized…
The memory-mode operation of a polymer dispersed liquid crystal (PDLC), which depends on the stiffness of the layer structure in the smectic-A phase, has been analysed by comparing ordinary PDLC and holographic PDLC (HPDLC). Although both PDLC films were fabricated from the same material, the temperature range of the…
The gene encoding D-hydantoinase from Agrobacterium radiobacter NRRL B11291 was successfully cloned by use of polymerase chain reaction. A positive clone was scored, and its nucleotide sequence was further analyzed. The analysis by deleting various lengths of nucleotides from the amino terminus of the open reading fra…
The tuning of strength and anisotropy of S⋅⋅⋅S interactions in the molecular crystals of the TTF family can be achieved by changing the subsituent attached to the S atoms. This result comes from investigations that combine the results of a statistical analysis of the known TTF-based molecular crystals (neutral and cha…
We report in this paper measurements of the rising velocity of champagne bubbles, investigated by using a camera and a stroboscopic light. It is shown that the velocity of bubbles during ascent is intermediate between that of a rigid sphere and that of a fluid sphere free from surface-active compounds. We show that ou…
A porphyrin covalently appended monolayer film on a glass substrate prepared by axial coordination reaction of protoporphyrin IX zinc (ZnPP) and a self-assembled monolayer of (3-aminopropyl)trimethoxysilane on a glass surface was reported. The structure and stability of the porphyrin film to photo reaction, acid, and…
Microwave irradiation for 15 minutes allowed the highly selective hydrothermal synthesis of the diamagnetic, air-stable oxidation catalyst [PW11O39RuII(DMSO)](5-), as confirmed by H-1, P-31, Ru-99 and W-183 NMR techniques.
Infrared spectroscopy is being increasingly utilized for the analysis of peptides and proteins because it probes the universally available amide (peptide) bonds, which display distinct IR signals for differently folded peptides and proteins. Other spectroscopic techniques useful for studying protein structures in solu…
Pyrazole and pyridine adducts of methyltrioxorhenium(VII) form bisperoxo complexes with excess H2O2 (see picture). Density functional calculations reveal that the increased efficiency of these complexes as catalysts for olefin epoxidation originates from their stability and from the moderate energies of the correspond…
Infrared spectroscopy is being increasingly utilized for the analysis of peptides and proteins because it probes the universally available amide (peptide) bonds, which display distinct IR signals for differently folded peptides and proteins. Other spectroscopic techniques useful for studying protein structures in solu…
Elastic energy absorption measurements versus temperature on semiconducting, semi-insulating (SI) and Fe-doped InP are reported. A thermally activated relaxation process is found only in the SI state, which is identified with the hopping of H atoms trapped at In vacancies. It is proposed that the presence of In vacanc…
Numerical results based on an extended BPM algorithm indicate that, in Marcatili's lossless tapers and bends, through-flowing waves are drastically different from standing waves. The source of this surprising behavior is inherent in Maxwell's equations. Indeed, if the magnetic field is correctly derived from the elect…