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280 results on '"Burnett, Joseph"'

1. How the COVID-19 Pandemic Changed Chemistry Instruction at a Large Public University in the Midwest: Challenges Met, (Some) Obstacles Overcome, and Lessons Learned

Author

Burnett, Joseph W., Burke, K. A., Stephens, Nicole M., Bose, Ishani, Bonaccorsi, Cristina, Wade, Adam M., and Awino, Joseph K.

Abstract

This communication presents a partial historical summary of some of Iowa State University's Chemistry Department teaching response to the shift to online course delivery caused by the COVID-19 pandemic. The observations reflect discussions between and informal surveys of an instructor cohort that impacted roughly 1200 undergraduate students. These students were enrolled in general chemistry I, organic chemistry II, inorganic chemistry, quantum mechanics, and chemistry for nonphysical-science majors. The paper highlights the challenges faced and describes how faculty and students met them.

Published
2020
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16. Directing the H2-driven selective regeneration of NADH via Sn-doped Pt/SiO2.

Author

Burnett, Joseph W. H., Li, Jianwei, McCue, Alan J., Kechagiopoulos, Panagiotis N., Howe, Russell F., and Wang, Xiaodong

Subjects
*NAD (Coenzyme), *HETEROGENEOUS catalysts, *NICOTINAMIDE, *CATALYSTS, *TIN
Abstract

H2-Driven NADH regeneration has long suffered from low selectivity when non-enzymatic, particularly heterogeneous catalysts, are used. In addition to the unselective nature of the catalysts, the typically unmeasured NAD+ conversion has inevitably hindered catalyst development. Here we report Sn-doped Pt/SiO2 catalysts for the selective regeneration of NADH and show that doping Pt/SiO2 with 10 at% Sn can deliver a selectivity of 90% (at full conversion) using H2. We propose that this is a result of Sn disturbing the Pt ensemble, altering the mode of NAD+ adsorption and directing the reduction to the 1,4-position of the nicotinamide ring. [ABSTRACT FROM AUTHOR]

Published
2022
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17. Directing the H2-driven selective regeneration of NADH via Sn-doped Pt/SiO2.

Author

Burnett, Joseph W. H., Li, Jianwei, McCue, Alan J., Kechagiopoulos, Panagiotis N., Howe, Russell F., and Wang, Xiaodong

Subjects
NAD (Coenzyme), HETEROGENEOUS catalysts, NICOTINAMIDE, CATALYSTS, TIN
Abstract

H2-Driven NADH regeneration has long suffered from low selectivity when non-enzymatic, particularly heterogeneous catalysts, are used. In addition to the unselective nature of the catalysts, the typically unmeasured NAD+ conversion has inevitably hindered catalyst development. Here we report Sn-doped Pt/SiO2 catalysts for the selective regeneration of NADH and show that doping Pt/SiO2 with 10 at% Sn can deliver a selectivity of 90% (at full conversion) using H2. We propose that this is a result of Sn disturbing the Pt ensemble, altering the mode of NAD+ adsorption and directing the reduction to the 1,4-position of the nicotinamide ring. [ABSTRACT FROM AUTHOR]

Published
2022
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21. Comparative life cycle assessment of NAD(P)H regeneration technologies.

Author

Burnett, Joseph W. H., Sun, Ziying, Li, Jianwei, Wang, Xiaonan, and Wang, Xiaodong

Subjects
*NAD (Coenzyme), *PRECIOUS metals, *METAL catalysts, *CATALYST synthesis, *BIOCONVERSION, *BASE catalysts
Abstract

NAD(P)H is a key cofactor widely used in biocatalytic reductive transformations, facilitating a wide range of industrially significant reactions which ultimately result in the consumption of the costly cofactor. To make NAD(P)H dependent biotransformations sustainable and economically feasible, different catalytic routes have been investigated to regenerate NAD(P)H. Here we report a comprehensive life cycle assessment (LCA) of these catalytic regeneration methods. Midpoint characterisation and normalisation show that the synthesis of the catalyst, specifically the use of noble metals and energy consumption, dominate the environmental impacts and have the greatest contribution to all considered impact categories. This comparative LCA highlights the need for future investigation into noble metal based catalyst alternatives, to provide cleaner and more sustainable methods of regenerating the cofactor NAD(P)H. [ABSTRACT FROM AUTHOR]

Published
2021
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22. Global Bifurcation of Periodic Solutions in Symmetric Reversible Second Order Systems with Delays.

Author

Balanov, Zalman, Burnett, Joseph, Krawcewicz, Wiesław, and Xiao, Huafeng

Subjects
*TOPOLOGICAL degree, *BIFURCATION theory, *BIFURCATION diagrams
Abstract

Global bifurcation and spatio-temporal patterns of periodic solutions (with prescribed period) to second order reversible equivariant autonomous systems with commensurate delays are studied using the Brouwer/Leray–Schauder O (2) × Γ × ℤ 2 -equivariant degree theory. Here, O (2) is related to the reversal symmetry combined with the autonomous form of the system, Γ reflects extra spacial symmetries of the system, and ℤ 2 is related to the oddness of the right-hand side. Abstract results are supported by a concrete example with Γ = D 6 — the dihedral group of order 12. [ABSTRACT FROM AUTHOR]

Published
2021
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23. Seasonal and Age-Related Variation in Daily Travel Distances of California Condors.

Author

Hall, Jonathan C., Hong, Insu, Poessel, Sharon A., Braham, Melissa, Brandt, Joseph, Burnett, Joseph, and Katzner, Todd E.

Abstract

Copyright of Journal of Raptor Research is the property of Raptor Research Foundation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021
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44. Another Sea Pest

Author

Burnett, Joseph W., Burnett, Mark G., and Kauffman, C. Lisa

Published
1995

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