Nanostructural Analysis of Age-Related Changes Affecting Human Dentin.

Human dentin performs its function throughout life, even though it is not remodeled like bone. Therefore, dentin must have extreme durability against daily repetitive loading. Elucidating its durability requires a comprehensive understanding of its shape, structure, and anisotropy at various levels of its structure.

Crystal structure of (μ-7-{[bis-(pyridin-2-ylmeth-yl)amino-1κ ,','']meth-yl}-5-chloro-quinolin-8-olato-2κ;1:2κ )tri-chlorido-1κ,2κ -dizinc(II).

The title compound, [Zn(CHClNO)Cl], is a dinuclear zinc(II) complex with three chlorido ligands and one penta-dentate ligand containing quinolin-8-olato and bis-(pyridin-2-ylmeth-yl)amine groups. One of the two Zn atom adopts a tetra-hedral geometry and coordinates two chlorido ligands with chelate coord-ination of the N and O atoms of the quinolin-8-olato group in the ligand. The other Zn atom adopts a distorted trigonal-bipyramidal geometry, and coordinates one chlorido-O atom of the quinolin-8-olato group and three N atoms of the bis-(pyridin-2-ylmeth-yl)amine unit.

Colorimetric quantification of vancomycin by highly active nitroxyl radical compounds.

Nitroxyl radicals, represented by 2,2,6,6-tetramethylpiperidine N-oxyl (TEMPO), are highly stable organic free radicals with unique properties and are used as functional molecules in various fields. However, TEMPO had low reactivity and sometimes did not provide enough response. Therefore, highly active nitroxyl radical compounds have been developed in which bicyclo and tricyclo structures stabilize the radicals.

DNA Duplex Containing Ag-Mediated Cytosine-Cytosine Base Pairs as a Catalyst Precursor for the 4-Nitrophenol Reduction with NaBH.

Catalytic applications of DNA duplexes containing Ag-mediated cytosine-cytosine base pairs (C-Ag-C) have not been well investigated. In this study, we demonstrate a novel approach for forming highly active DNA-capped Ag nanoparticle (DNA-AgNP) catalysts for the reduction of 4-nitrophenol (4-NP) using sodium borohydride (NaBH). This approach is based on the generation of DNA-AgNPs from DNA duplexes containing C-Ag-C (DNA duplex-Ag).