Small structural changes in organic molecules can have a large influence on solid-state crystal packing, and this often thwarts attempts to produce isostructural series of crystalline solids. For metal-organic frameworks and covalent organic frameworks, this has been addressed by using strong, directional intermolecular bonding to create families of isoreticular solids. Here, we show that an or...

The low-frequency Raman spectra of dioxane aqueous solutions have been analyzed from a dynamical aspect of water structure. The reduced Raman spectra x9( n̄) of the dioxane aqueous solutions are well explained by a superposition of three characteristic modes of water and one Gaussian mode ~;60 cm! of dioxane. The concentration dependence of x9( n̄) spectra shows that the 190 cm mode of water disa...

A novel approach of chemical mechanical polishing (CMP) is developed for mercury cadmium telluride (HgCdTe or MCT) semiconductors. Firstly, fixed-abrasive lapping is used to machine the MCT wafers, and the lapping solution is deionized water. Secondly, the MCT wafers are polished using the developed CMP slurry. The CMP slurry consists of mainly SiO2 nanospheres, H2O2, and malic and citric acids...

The C(2) proton resonances of the active site histidines (His 12 and His 119) of ribonuclease A have been exploited to study the inhibition pattern of both noncompetitive (four green tea polyphenols and their copper complexes) and competitive (3'-O-carboxy esters of thymidine and 3'-amino derivatives of uridine) inhibitors. Competitive inhibitors devoid of any phosphate group have the ability t...

The cholera toxin (CT)-binding activity of purified κ-casein macropeptide (CMP) from bovine κ-casein was detected. In addition, a statistical model was developed to optimize the production of CMP. CMP was prepared by chymosin hydrolysis of κ-casein and a subsequent 3% trichloroacetic acid treatment. CMP was further fractionated in an ion-exchange column by FPLC. CT binding activity was eluted a...

Six-membered ring cyclohexane derivatives with 2 oxygen (1,4-dioxane or p-dioxane) and 3 (1,3,5-trioxane) atoms have been used as organic molecules in the synthesis of zeolites omega (MAZ framework type) ECR-1 (EON type). Both yield zeolite at moderate temperatures a composition aluminum distribution similar to those obtained more standard organics such tetramethylammonium cation. If preparatio...

Global concern over the carcinogenic potential of 1,4-dioxane and several nitrosamines has resulted in increased interest in the development of more efficient testing methods for these contaminants in drinking waters. In the U.S., the current methodologies recommended for the analysis of 1,4-dioxane and nitrosamines in drinking waters are Environmental Protection Agency (EPA) Methods 522 and 52...

In the title compound, C(13)H(12)BrNO(4), the dihedral angles between the amino-methyl-ene group and the dioxane ring and between the benzyl ring and the amino-methyl-ene unit are 7.96 (4) and 12.15 (4)°, respectively. The dioxane ring shows a half-boat conformation, in which the C atom between the dioxane ring O atoms is 0.460 (8) Å out of the plane through the remaining ring atoms. An intra-m...

In the title compound, C(13)H(11)ClN(2)O(6), the dihedral angles between the benzene ring and the amino-methyl-ene unit and between the amino-methyl-ene group and the dioxane ring are 8.19 (14) and 1.39 (17)°, respectively. The dioxane ring has a half-boat conformation, in which the C atom between the dioxane O atoms is 0.662 (4)Å out of the plane through the remaining ring atoms. Intra-molecul...