Molecular hybrids of trivacant lacunary polyoxomolybdate and multidentate organic ligands.

Functional molecular inorganic-organic hybrids of lacunary polyoxometalates and organic ligands attract much attention for advanced material applications. However, the inherent instability of lacunary polyoxomolybdates hinders the synthesis of hybrids and their utilization. Herein, we present a viable approach for the synthesis of molecular hybrids of trivacant lacunary Keggin-type polyoxomolybdates and multidentate organic ligands including carboxylates and phosphonates, which is based on the use of a lacunary structure stabilized by removable pyridyl ligands as a starting material.

Effect of temperature on the hydrolysis of levan treated with compressed hot water fluids.

The hydrolysis of levan using compressed hot water for the production of functional fructooligosaccharides (FOSs) was investigated. Levans from (EH) and (HS) were characterized using scanning electron microscopy and light scattering techniques, and hydrolyzed using compressed hot water at four temperatures (120, 140, 160, and 180°C). The hydrolysates were analyzed using high-performance liquid chromatography and electrospray ionization-mass spectrometry.

An interdigitated electrode with dense carbon nanotube forests on conductive supports for electrochemical biosensors.

A highly sensitive interdigitated electrode (IDE) with vertically aligned dense carbon nanotube forests directly grown on conductive supports was demonstrated by combining UV lithography and a low temperature chemical vapor deposition process (470 °C). The cyclic voltammetry (CV) measurements of K4[Fe(CN)6] showed that the redox current of the IDE with CNT forests (CNTF-IDE) reached the steady state much more quickly compared to that of conventional gold IDE (Au-IDE). The performance of the CNTF-IDE largely depended on the geometry of the electrodes (e.

[AN ISOLATED INTERNAL ARTERY ANEURYSM WITH COMPLETE THROMBOTIC OCCLUSION FOR WHICH PREOPERATIVE DIAGNOSIS WAS DIFFICULT: A CASE REPORT].

A 74-year-old man was incidentally discovered during treatment of prostate cancer to have a pelvic tumor, measuring 8 cm in diameter. Enhanced abdominal computed tomography (CT) showed a roundish-shaped hypovascular solid tumor compressing the left internal iliac artery to the inner back side. Values on endocrinological examination were within normal ranges.

Oxygen diffusion and nonstoichiometry in BiFeO3.

Leakage current is a serious problem for the use of ferroelectricity in room-temperature multiferroics BiFeO3, and oxygen nonstoichiometry is considered as one of its principal origins. In order to establish a method to control oxygen content in the compound, we investigated the annealing process of stoichiometric BiFeO3 grains in air and revealed that oxygen diffusion occurs in two steps: (1) the weight of the sample decreases in a short time, which originates from the generation of oxygen deficiency near the surface of the grains; and then (2) it increases gradually and slowly, which originates from oxygen diffusion toward equilibrium in the inner part of the grains, introducing excess oxygen there. Step 1 causes the leakage current, and step 2 tends to cause inhomogeneity of oxygen content as well as the leakage current.