Highly purified preparations of D-aIIIiII0 acid oxidase were obtained by removal of high molecular weight components after purification by established procedures. Molecular sieve studies were carried out on the size characterization of the highly purified apoenzyme molecule. In the microgram per ml concentration range the apoenzyme was shown to dissociate to a subunit with a molecular Stokes ra...

zeolites due to their structures can be used as molecular sieves for purification of materials and solutions. zeolites with phi and sod structure are so common and applicable for this purpose. hydroxy sodalite and phillipsite are the more abundant members of zeolites which display good selectivity for very small molecules and some ions such as sr, pb, zn, cu and rb. there is not any pure natura...

Applications of zeolite membranes in separation, chemical sensors, and catalytic membrane reactors have led to extensive studies on their fabrication. To date, mainly silicatebased zeolite membranes of the structure types MFI, DDR, LTA, and FAU have been synthesized on different substrates and evaluated for singleor multiple-gas permeation. Routes for the synthesis of zeolite membranes can be b...

A novel 3D metal-organic framework (MOF) with 2D rhombic channels was synthesized for selective adsorption of p-xylene from xylene isomers by acting as a molecular sieve.

Secondary aluminum dross as a solid waste can cause great harm to environment. However, it contains rich alumina oxide which is an ideal raw material for the preparation of molecular sieve. Therefore, optimal process was explored 4A sieve using secondary source and additional silicon source. The results show that prepared under conditions silicon/aluminum 2.0, crystallization temperature 95 °C ...

On February 2, 1999, we completed the factorization of the 140–digit number RSA–140 with the help of the Number Field Sieve factoring method (NFS). This is a new general factoring record. The previous record was established on April 10, 1996 by the factorization of the 130–digit number RSA–130, also with the help of NFS. The amount of computing time spent on RSA–140 was roughly twice that neede...