University of California

Icagen, Inc.

Rebecca L Miller

Benjamin P Warner

Eva Rachel Birnbaum

Lori J Peterson

Jennifer A Berger

Scott A Kinkead

Kent D Abney

Anthony B Pinkerton

The present invention includes a method and apparatus for measuring the transport of an analyte through a cell membrane. One or more cells expressing a plurality of ion channels are provided. These cells are loaded with the analyte so that the cells contain at least 10 picograms of the analyte within a volume defined by the area of an x-ray excitation beam and a depth of five times the 1/e attenuation depth for at least one characteristic x-ray signal of the analyte as attenuated by water. The unloaded analyte is removed and the amount of the analyte in the cells is measured with x-ray fluorescence.

Method for measuring analyte transport across cell membranes using X-ray fluorescence

Preparation and use of tetra-C-alkyl cobalt dicarbollide for extraction of cesium and strontium into hydrocarbon solvents. Tetra-C-alkyl derivatives of cobalt dicarbollide, Co(C.sub.2 R.sub.2 B.sub.9 H.sub.9).sub.2.sup.- (CoB.sub.2 R.sub.4.sup.- ; R=CH.sub.3 and C.sub.6 H.sub.13) are demonstrated to be significant cesium and strontium extractants from acidic and alkaline solutions into non-toxic organic solvent systems. Extractions using mesitylene and diethylbenzene are compared to those with nitrobenzene as the organic phase. CoB.sub.2 -hexyl.sub.4.sup.- in diethylbenzene shows improved selectivity (10.sup.4) for Cs over Na in acidic solution. In dilute alkaline solution, CoB.sub.2 -hexyl.sub.4.sup.- extracts Cs less efficiently, but more effectively removes Sr from higher base concentrations. A general synthesis of tetra-C-alkyl cobalt dicarbollides is described.

Preparation and use of tetra-alkyl cobalt dicarbollide for extraction of

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Los Alamos, NM, United States of America

Rebecca L Miller