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Iowa State University

Selected Works

1990

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Multi-Isfet Sensors For Soil Nitrate Analysis, Stuart J. Birrell, John W. Hummel Jan 1990

Multi-Isfet Sensors For Soil Nitrate Analysis, Stuart J. Birrell, John W. Hummel

Stuart J. Birrell

The management of a field as a heterogeneous area is now being investigated by many researchers in universities, companies, and research institutions. However, for site-specific application of inputs, it is necessary to develop systems to sense the variation of important properties in real time. Several studies have shown that ion selective electrodes can be used to measure soil nitrates. This work involves an investigation in the use of Ion Selective Field Effect Transistors (ISFETs), to measure soil nitrate levels.


Biochemical And Immunochemical Comparison Of Africanized And European Honeybee Venoms, D. R. Nelson, Anita M. Collins, Richard L. Hellmich, R. T. Jones, R. M. Helm, D. L. Squillace, J. W. Yunginger Jan 1990

Biochemical And Immunochemical Comparison Of Africanized And European Honeybee Venoms, D. R. Nelson, Anita M. Collins, Richard L. Hellmich, R. T. Jones, R. M. Helm, D. L. Squillace, J. W. Yunginger

Richard L Hellmich

Africanized honeybees (HBs) pose a hazard to both normal and sting-sensitive subjects in certain areas of Central and South America, and it is predicted that they will soon be present in the southern United States as well. Using an electrical stimulation device, we collected Africanized HB venom (AHV) in Venezuela and European HB venom (EHV) in Louisiana. These venoms, along with commercial European HB venom (CHV), were compared by thin-layer isoelectric focusing and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The Coomassie brilliant blue and silver-stained banding patterns of AHV and EHV were essentially identical to CHV. Western blots were prepared …


Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay Jan 1990

Modeling Environmental Response To Power Interruptions In Swine Nurseries, Jay D. Harmon, E. R. Collins Jr., E. T. Kornegay

Jay D. Harmon

A deterministic simulation model was developed to help assess emergency environmental needs of swine nurseries by modeling short term power interruptions. The model accounts for heat exchange by conduction, convection, radiation and air infiltration. A sub-model, developed by the North Central Region Committee 179, was used to predict swine heat and moisture loss. The model was validated using a nursery constructed of concrete block. The model performed well for cases with a constant solar load but tended to overpredict temperature changes during periods of no solar load. Validation indicated that wind velocity had the most effect upon model error. Sensitivity …