The valence isomers of (CH)8 and (SiH)8: An ab initio MO study

The 22 possible valence isomers of the (CH)₈ and (SiH)₈ systems have been studied by ab initio molecular orbital calculations at the MP2/6-31G*//6-31G* + ZPE level. Optimized geometries, relative energies, and, for some selected compounds, vibrational frequencies are reported. The systematic differences between the carbon and silicon compounds are analyzed. © 1994 by John Wiley & Sons, Inc.     

Direct potentiometric immunoelectrodes

A method is described to determine Atrazine and its cross-reacting relatives in water, using a previously described graphite based one-way immunoelectrode and any standard millivoltmeter with low input bias current. The new procedure separates the potential measuring step from the incubation step. In this way, the conditions for highly stable potential measurements and for a most effective formation of the hapten (Atrazine) antibody complex can be optimized separately and all imponderable influence from ions in the analyte water is excluded. The limit of detection of such an electrode is some nanogram per liter.Part III: see [4]