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Articles 2911 - 2916 of 2916

Full-Text Articles in Social and Behavioral Sciences

Backcountry Water Treatment To Prevent Giardiasis, Jerry E. Ongerth, Ron L. Johnson, Steven C. Macdonald, Floyd Frost, Henry H. Stibbs Jan 1989

Backcountry Water Treatment To Prevent Giardiasis, Jerry E. Ongerth, Ron L. Johnson, Steven C. Macdonald, Floyd Frost, Henry H. Stibbs

Faculty of Engineering and Information Sciences - Papers: Part A

This study was conducted to provide current information on the effectiveness of water treatment chemicals and filters for control of Giardia cysts in areas where treated water is not available. Four filters and seven chemical treatments were evaluated for both clear and turbid water at 10°C. Three contact disinfection devices were also tested for cyst inactivation. Filters were tested with 1-liter volumes of water seeded with 3 x 104 cysts of G. lamblia produced in gerbils inoculated with in vitro cultured trophozoites; the entire volume of filtrate was examined for cyst passage. Chemical treatments were evaluated at concentrations specified ...


Efficiency Of Neighbour Analysis For Replicated Variety Trials In Australia, Brian R. Cullis, A. C. Gleeson Jan 1989

Efficiency Of Neighbour Analysis For Replicated Variety Trials In Australia, Brian R. Cullis, A. C. Gleeson

Faculty of Engineering and Information Sciences - Papers: Part A

Use of a one-dimensional neighbour method of analysis in 1019 variety trials of a range of crops conducted by plant breeders in four states of Australia in 1985–87 resulted in an average reduction of 42% in variances of varietal yield differences compared with conventional randomized complete block analysis. Of these trials, 219 were designed as square, rectangular or generalized lattices and the average reduction in variances of varietal yields with incomplete block analysis and recovery of interblock information was 33%. The results emphasized that plots should be wide enough to avoid interplot competition, and that neighbour analysis is of ...


Relative Accuracy Of A Neighbour Method For Field Trials, W J. Lill, A C. Gleeson, Brian R. Cullis Jan 1988

Relative Accuracy Of A Neighbour Method For Field Trials, W J. Lill, A C. Gleeson, Brian R. Cullis

Faculty of Engineering and Information Sciences - Papers: Part A

Two scries of simulation experiments were used to investigate the accuracy of treatment and variance estimation with a neighbour analysis of field trials proposed by Gleeson & Cullis (1987). The first series examined the accuracy of residual maximum likelihood (REML) estimation of seven theoretical error models applicable to field trials. REML estimation provided accurate estimates of the variance parameters, but the Ftest of treatments was slightly biased upward (to +2·4%) for first differences models and slightly biased downwards (to –1·4%) for second differences models. The second series of simulations, based on 19 uniformity data sets, illustrated that treatment effects ...


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.


Immunofluorescence Detection Of Cryptosporidium Oocysts In Fecal Smears, Henry H. Stibbs, Jerry E. Ongerth Jan 1986

Immunofluorescence Detection Of Cryptosporidium Oocysts In Fecal Smears, Henry H. Stibbs, Jerry E. Ongerth

Faculty of Engineering and Information Sciences - Papers: Part A

An indirect fluorescent antibody (IFA) procedure was developed for the detection of Cryptosporidium sp. oocysts in human, nonhuman primate, and bovine fecal smears. The procedure, which takes about 90 min to perform, involves the use of a rabbit antiserum against Cryptosporidium oocysts isolated from dairy cattle. Cross-specificity testing of the IFA method revealed no reactivity with yeasts, various amoebae, Giardia lamblia, Chilomastix sp., or Blastocystis sp. and only very weak cross-reactivity with coccidian oocysts of other genera. IFA detection of oocysts in human and nonhuman primate fecal smears was far more sensitive than was dimethyl sulfoxide-carbolfuchsin staining. Moreover, IFA detection ...