Phenolic constituents in Erythrina x bidwilli and their activity against oral microbial organisms.

Five flavonoid compounds, including two new isoflavanones, were isolated from the root bark of Erythrina x bidwilli. Their structures were determined to be 2,10-di(gamma,gamma-dimethylallyl)-3,9-dihydroxypterocarpan (erythrabyssin II), 6,8-di(gamma,gamma-dimethylallyl)-7,2',4'-trihydroxyisoflavanone (bidwillon A), 8-gamma,gamma-dimethylallyl-2',4'-dihydroxy-[6",6"-di-methylpyrano - (2",3":7,6)]isoflavanone (bidwillon B), 8-gamma,gamma-dimethylallyl-7,4'-dihydroxyisoflavone (8-gamma,gamma-dimethyl-allyldaidzein), and 8-gamma,gamma-dimethylallyl-5,2',4'-trihydroxy-[6",6"-dimethylpyrano+ ++- (2",3":7,6)]isoflavone (auriculatin), by means of spectroscopic analysis. Some potent activities against oral microbial organisms (Fusobacterium nucleatum and Prevotella intermedia) were shown in these flavonoid compounds.     

A tetrahydroisoquinoline-monoterpene glucoside and an iridoid glucoside from Alangium kurzii

From the leaves of Alangium kurzii, a new tetrahydroisoquinoline-monoterpene glucoside, 6-O-methyl-N-deacetylipecosidic acid and a new iridoid glucoside, 10-O-benzoyladoxosidic acid, were isolated along with alangiside, demethylalangiside, 6'-O-beta-D-glucosylhenryoside, uridine and four known flavonoid glycosides. The structures of new glucosides were determined on the basis of spectroscopic and chemical methods.     

Utilization of42Ar−42K generator for isotope dilution analysis of potassium in ultra-pure water

Carrier- and salt-free⁴²K milked from an⁴²Ar–⁴²K generator was utilized for isotope dilution analysis of potassium in ultra-pure water. Potassium in the sample marked with the⁴²K was shown to be concentrated easily 60 times by crown-ether extraction and acid back-extraction to be determined by atomic absorption spectrophotometry. The same extractions proved to be effective for removing the reagent blank. Cerenkov radiation counting was often suitable for⁴²K measurement. The⁴²K was used also for studying the interaction of ultra-low concentrations of potassium with vessel walls.     

A model proposed for the interpretation of DTA and X-ray data of the III → I transition in sodium sulfate

The transition between phase I and phase III in sodium sulfate (Na₂SO₄) was studied by high temperature X-ray diffraction and the calculation of diffraction patterns. An intermediate phase (phase II) was detected on cooling in the undoped and 1.7 at.% yttrium-doped Na₂SO₄, but not observed in the 3.8 at.% Y-doped sample. The DTA and X-ray diffraction results of the III ? I transition were explained well by a proposed model which consisted mainly of the following steps: (i) the rotation of the SO₄ tetrahedra, and (ii)the disappearance of interfaces among the transformed domains.     

Application of the zone melting technique to metal chelate systems-V Zone chromatographic separation of metal chelates on columns of some inert solid solvents

Binary mixtures of acetylacetone and 8-hydroxyquinoline chelates of copper(II), nickel(II), cobalt(II) and cobalt(III) were processed by zone-chromatography on columns of some naphthylalkyl ethers as inert solid solvents. The metal chelates were separated to give chromatograms on the columns according to the ratio of their distribution coefficients. Distribution coefficients of metal ions varied with the type of chelating agent used and the solid solvent, and were found to be strongly affected by operating conditions, especially zone length, zone travelling speed and initial concentration of the metal chelate.     

Stereostructure of komodoquinone A, a neuritogenic anthracycline, from marine Streptomyces sp. KS3

The absolute stereostructure of komodoquinone A (1), a neuritogenic anthracycline, which was isolated from a cultured marine Streptomyces sp. KS3, has been determined on the basis of chemical derivatization. Komodoquinone A (1) induces neuronal cell differentiation in the neuroblastoma cell line, Neuro 2A and arrests the cell cycle at the G1 phase. The effect of a solid-state medium on the production of 1 and its aglycone, komodoquinone B (2), was examined.     

Steam reforming of methanol over Cu/ZrO2. Role of ZrO2 support

Cu/ZrO₂ was highly active and selective for the title reaction. The activity obtained exceeded greatly that obtained over Cu/SiO₂. It was shown that the precursors highly dispersed on zirconia support were readily reduced to very fine particles of metallic copper.

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Cu/ZrO₂ . Cu/SiO₂. , , , .

     

Molecular design and biological potential of galacto-type trehalose as a nonnatural ligand of shiga toxins

Galacto-type trehalose, a "C-4 epimer of trehalose", possesses a stereochemical structure around the alpha(1-1)-linkage analogous to that of the globobiosyl alpha(1-4)-linkage in Gb(2) and Gb(3) ceramides, which are known as the ligands of Shiga toxins produced by pathogenic E. coli. This paper presents evidence supporting the new idea of using a trehalosyl alpha(1-1)-linkage as a substitute for the galactobiosyl alpha(1-4)-linkage.