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Full-Text Articles in Social and Behavioral Sciences

Identification Of Cryptosporidium Oocysts In River Water, Jerry Ongerth, Henry Stibbs Jan 1987

Identification Of Cryptosporidium Oocysts In River Water, Jerry Ongerth, Henry Stibbs

Faculty of Engineering and Information Sciences - Papers: Part A

Water samples were collected from four rivers in Washington State and two rivers in California and examined for the presence of Cryptosporidium oocysts. Oocyst-sized particles were concentrated from 20-liter samples of water by membrane filtration, centrifugation, and differential sedimentation. The particle concentrate was then deposited on a 25-mm-diameter membrane filter for oocyst identification by indirect immunofluorescence assay. The identification procedure had a limit of detection of about five oocysts per liter. Cryptosporidium oocysts were found in each of 11 river water samples examined. Concentrations ranged from 2 to 112 oocysts per liter. The finding of Cryptosporidium oocysts in all samples ...


Representations Of Crossed Products By Coactions And Principal Bundles, M B. Landstad, J Phillips, Iain Raeburn, C E. Sutherland Jan 1987

Representations Of Crossed Products By Coactions And Principal Bundles, M B. Landstad, J Phillips, Iain Raeburn, C E. Sutherland

Faculty of Engineering and Information Sciences - Papers: Part A

The main purpose of this paper is to establish a covariant representation theory for coactions of locally compact groups on C*-algebras (including a notion of exterior equivalence), to show how these results extend the usual notions for actions of groups on C*-algebras, and to apply these ideas to classes of coactions termed pointwise unitary and locally unitary to obtain a complete realization of the isomorphism theory of locally trivial principal G-bundles in this context. We are also able to obtain all (Cartan) principal G-bundles in this context, but their isomorphism theory remains elusive.