This invention consists of a light-intensity dependent molecular switch comprised of a compound which shuttles an electron or a plurality of electrons from a plurality of electron donors to an electron acceptor upon being stimulated with light of predetermined wavelengths, and a method for making said compound.

The invention is a process for selectively extracting strontium values from aqueous nitric acid waste solutions containing these and other fission product values. The extractant solution is a macrocyclic polyether in an aliphatic hydrocarbon diluent containing a phase modifier. The process will selectively extract strontium values from nitric acid solutions which are up to 6 molar in nitric acid.

An extraction chromatographic method for the preparation of {sup 90}Y of high chemical and radiochemical purity is disclosed. After an initial purification of a {sup 90}Sr stock solution and a suitable period of {sup 90}Y ingrowth, the solution is passed through a series of strontium-selective chromatographic columns, each of which lowers the {sup 90}Sr content of the mixture by a factor of about 10{sup 3}. The {sup 90}Y remaining is freed from any residual {sup 90}Sr, from its {sup 90}Zr daughter, and from any remaining impurities by passing the sample through a final column designed to selectively retain yttrium.

The capability of American technology and industry to develop a ''homegrown'' motor fuel to meet national energy policy goals will take a major step forward in the next year. During 1994, the National Renewable Energy Laboratory (NREL), with U. S. Department of Energy (DOE) support, will begin operating a$2.2 million Alternative Fuels Users Facility (AFUF) at its Golden, Colorado site.

This document is a collection of the published reports describing research supporting the Idaho National Engineering Laboratory (INEL) Boron Neutron Capture Therapy (BNCT) Research Program for calendar year 1992. Contributions from the principal investigators about their individual projects are included, specifically, chemistry (pituitary tumor studies, boron drug development including liposomes, lipoproteins, and carboranylalarnine derivatives), pharmacology (murine screenings, toxicity testing, ICP-AES analysis of biological samples), physics (radiation dosimetry software, neutron beam and filter design, neutron beam measurement dosimetry), and radiation biology (small and large animal models tissue studies and efficacy studies). These reports have previously appeared in two books: Progress in Neutron Capture Therapy for Cancer, edited by B. J. Allen, D. E. Moore, B. V. Harrington, Plenum Press, 1992; and Boron Neutron Capture Therapy Toward Clinical Trials of Glioma Patients, edited by D. Gabel and R. Moss, Plenum Press, 1992. Reports have also appeared in four journals: Analytica Chimica Acta, Inorganic Chemistry, Nuclear Science and Engineering, and the Proceedings of the National Academy of Science.