Occurrence of Aflatoxin M1 in Raw and Pasteurized Goat Milk in Thailand

Abstract

Scanning tunneling microscopy (STM) has been used to determine the surface atomic structure of Si(111)(2*Squareroot(3)&2*Squareroot(3))-Sn. The topographic images show four resolved atoms in each (2*Squareroot(3)&2*Squareroot(3)) unit cell, and the structure is found to be onefold symmetric. Together with coverage measurements, the STM analysis implies that the reconstructed surface is an epitaxial Sn two-layer structure, where the atoms adopt a bonding configuration characteristic of alpha-Sn. A three-dimensional structure model, in accordance with the obtained results, is proposed.