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Bozeman, MT, United States

Reeves W.K.,1000 East University Avenue | Reeves W.K.,Apo Box Inc. | Lloyd J.E.,1000 East University Avenue | Stobart R.,1000 East University Avenue | And 4 more authors.
Journal of the American Mosquito Control Association | Year: 2010

Culicoides sonorensis is the primary vector of bluetongue and epizootic hemorrhagic disease viruses in North America. Bluetongue disease is one of the most economically important arthropod-borne diseases of sheep in North America, because it causes significant morbidity and mortality and can lead to local quarantines and international trade restrictions. Long-lasting repellent pesticides could be applied to sheep as they are moved down from mountain pastures to protect them from biting midges until the 1st frost. We tested long-lasting pesticides on sheep as repellents against C. sonorensis. Both PYthon ear tags with 10 zeta-cypermethrin (9.8 g/tag) synergized with 20 piperonyl butoxide (PBO) and a 12-ml low-volume spray application of ready-to-use sheep insecticide (Y-TEX) with 2.5 permethrin and 2.5 PBO in an oil-based formulation were repellent to C. sonorensis for at least 35 wk after a single application. © 2010 by The American Mosquito Control Association, Inc. Source

Lauchnor E.,Montana State UniversityBozeman | Phillips A.,Montana State UniversityBozeman | Gerlach R.,Montana State UniversityBozeman | Cunningham A.B.,Montana State UniversityBozeman
Water Resources Research | Year: 2015

The model for microbially induced calcite precipitation (MICP) published by Ebigbo et al. (2012) has been improved based on new insights obtained from experiments and model calibration. The challenge in constructing a predictive model for permeability reduction in the underground with MICP is the quantification of the complex interaction between flow, transport, biofilm growth, and reaction kinetics. New data from Lauchnor et al. (2015) on whole-cell ureolysis kinetics from batch experiments were incorporated into the model, which has allowed for a more precise quantification of the relevant parameters as well as a simplification of the reaction kinetics in the equations of the model. Further, the model has been calibrated objectively by inverse modeling using quasi-1D column experiments and a radial flow experiment. From the postprocessing of the inverse modeling, a comprehensive sensitivity analysis has been performed with focus on the model input parameters that were fitted in the course of the model calibration. It reveals that calcite precipitation and concentrations of NH4+ and Ca2+ are particularly sensitive to parameters associated with the ureolysis rate and the attachment behavior of biomass. Based on the determined sensitivities and the ranges of values for the estimated parameters in the inversion, it is possible to identify focal areas where further research can have a high impact toward improving the understanding and engineering of MICP. © 2015. American Geophysical Union. All Rights Reserved. Source

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