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324 results on '"Johnson, M.E."'

21. Potential artifacts and control experiments in toxicity tests of nanoplastic and microplastic particles

Author

Petersen, E.J., Barrios, A.C., Henry, T.B., Johnson, M.E., Koelmans, A.A., Montero Bustos, A.R., Matheson, J., Roesslein, M., Zhao, J., Xing, B., Petersen, E.J., Barrios, A.C., Henry, T.B., Johnson, M.E., Koelmans, A.A., Montero Bustos, A.R., Matheson, J., Roesslein, M., Zhao, J., and Xing, B.

Abstract

To fully understand the potential ecological and human health risks from nanoplastics and microplastics (NMPs) in the environment, it is critical to make accurate measurements. Similar to past research on the toxicology of engineered nanomaterials, a broad range of measurement artifacts and biases are possible when testing their potential toxicity. For example, antimicrobials and surfactants may be present in commercially available NMP dispersions, and these compounds may account for toxicity observed instead of being caused by exposure to the NMP particles. Therefore, control measurements are needed to assess potential artifacts, and revisions to the protocol may be needed to eliminate or reduce the artifacts. In this paper, we comprehensively review and suggest a next generation of control experiments to identify measurement artifacts and biases that can occur while performing NMP toxicity experiments. This review covers the broad range of potential NMP toxicological experiments, such as in vitro studies with a single cell type or complex 3-D tissue constructs, in vivo mammalian studies, and ecotoxicity experiments testing pelagic, sediment, and soil organisms. Incorporation of these control experiments can reduce the likelihood of false positive and false negative results and more accurately elucidate the potential ecological and human health risks of NMPs.

Published
2022

45. Using modern software tools to design, simulate and test a Level 1 sub-system for the D Zero detector

Author

Angstadt, R., Borcherding, F., Johnson, M.E., and Moreira, L.

Subjects
Nuclear track detectors -- Testing, Business, Electronics, Electronics and electrical industries, Microsoft Excel (Spreadsheet software) -- Usage, Microsoft Visual Basic for Applications (Application development software) -- Usage
Abstract

This paper describes a system which uses a commercial spreadsheet program and commercial hardware on an IBM PC to develop and test a track finding system for the D Zero Level 1 scintillating fiber trigger. The trigger system resides in a VME crate. This system allows the user to generate test input, write the pattern to the hardware, simulate the results in software, read the hardware result, compare the results and inform the user of any differences.

Published
1996

47. Design of a hardware testing system for the D zero detector

Author

Angstadt, R., Johnson, M.E., Martin, M.I., Matulik, M.S., and Utes, M.

Subjects
Detectors -- Research, Control systems -- Testing, Business, Electronics, Electronics and electrical industries
Abstract

Testing a system as large as the D Zero data acquisition system is difficult. The use of IBM compatible personal computers in a hardware test system that can run on any size system from an engineer's test bench to the entire subsystem in the D Zero Detector is described. The test system uses a PC to VME bus interface for the local testing and the Token Ring network for more global testing. This system has been implemented for several different hardware systems in D Zero.

Published
1993

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