A Simple Method for Measuring Ground-Level Ozone in the Atmosphere

Knudsen, Gabriel A.; Seeley, Stacy K.; Seeley, John V.; Bull, Arthur W.; Fehir, Richard J.; Cornwall, Susan

doi:10.1021/ed082p282

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…The hydrogel film was made of alginate‐calcium ion (Ca 2+ ) complex and embedded with GA‐Pt, starch, and triiodide (I 3 − ). Starch reacts with I 3 − to form a violet colored complex (Figure a), leading to the formation of a violet colored film (Supporting Information, Figure S14a). The film was irradiated by pulse NIR laser through a photomask.…”

Section: Figurementioning

confidence: 99%

Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

et al. 2017

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Engineering near-infrared (NIR) light-sensitive enzymes remains ah uge challenge.Aphotothermal effectassociated method is developed for tailoring the enzymatic activity of enzymes by exposure to NIR light. An ultrasmall platinum nanoparticle was anchored in an enzyme to generate local heating upon NIR irradiation, which enhanced the enzyme activity without increasing bulk temperature.F ollowing NIR irradiation, the enzyme activity was tailored rapidly and reversibly,a nd was modulated by varying laser power density and irradiation time.F our enzymes were engineered, including glucoamylase,g lucose oxidase,c atalase,a nd proteinase Kwith NIR-light sensitivity,and demonstrated their utility in practical applications such as photolithography and NIR light-responsive antibacterial or anticancer actions.Our investigation suggests that this approach could be broadly used to engineer enzymes with NIR-light sensitivity for many biological applications.

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Section: Figurementioning

confidence: 99%

Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

et al. 2017

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“…Chemistry departments have made considerable efforts over many years to include environmental topics and course offerings in the curriculum. , Providing educational opportunities in environmental sciences will be increasingly more important as industrialization continues to grow and develop throughout the world. There have been many publications in this journal describing environmental courses, developed curriculum materials, and laboratory experiments. − Some of these focus on investigating aqueous and soil samples. − Other developed experiments investigate atmospheric aspects, such as understanding anthropogenic sources of chlorine and ozone, measuring ozone or NO x levels in the environment through economical methods, , and creating ozone samples in the lab for the purpose of investigating physical and chemical properties of the gas. , …”

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confidence: 99%

“…8−17 Some of these focus on investigating aqueous and soil samples. 18−21 Other developed experiments investigate atmospheric aspects, such as understanding anthropogenic sources of chlorine and ozone, 22 measuring ozone or NO x levels in the environment through economical methods, 23,24 and creating ozone samples in the lab for the purpose of investigating physical and chemical properties of the gas. 25,26 The vast majority of students in our first semester honors general chemistry course express great interest in environmental chemistry topics.…”

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An Undergraduate Experiment to Investigate Air Pollutants Created from Lightning

Wagner

Murray

2021

J. Chem. Educ.

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Chemistry of the environment has been a long-standing and important area of scientific research. Atmospheric chemistry is of particular interest in society due to the impact that rising levels of pollutants are having on the climate. It is wellknown that combustion processes create CO and NO x , which leads to the creation of other pollutants, such as ozone and CO 2 . There are natural processes, such as lightning, that also create a significant amount of pollutant gases. The purpose of this guided and open inquiry laboratory experiment is to provide an opportunity for students to investigate how lightning may produce pollutant gases in the atmosphere. In the guided inquiry experiment, a sealed IR gas cell containing air is exposed to a spark or corona discharge created by an Oudin coil to mimic lightning. IR spectroscopy is used to monitor the reaction progress and identify new species made after exposure to the electrical discharge. Based on the results, students draw conclusions about what types of gases are created in the two different discharge processes and how lightning may contribute to atmospheric pollutants. Students move on to the open inquiry to further investigate aspects of atmospheric gases, where they develop their own hypothesis and methods based on one of the provided suggestions, such as the effect of spark and corona discharge on pure oxygen, nitrogen, or carbon dioxide gases, the kinetics of ozone creation and decay, and the temperature dependence of NO 2 dimerization. Although designed for an honors general chemistry course, this experiment can be adapted for second-semester general chemistry, environmental chemistry, analytical, and physical chemistry laboratory courses. Results from these experiments are presented, and the relevant atmospheric chemical processes are discussed. The impact of this experiment on perceived gains in knowledge, the value of inclusion in the curriculum, and the design of the experiment were assessed, and the results are discussed.

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Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

et al. 2017

View full text Add to dashboard Cite

Engineering near-infrared (NIR) light-sensitive enzymes remains a huge challenge. A photothermal effect-associated method is developed for tailoring the enzymatic activity of enzymes by exposure to NIR light. An ultrasmall platinum nanoparticle was anchored in an enzyme to generate local heating upon NIR irradiation, which enhanced the enzyme activity without increasing bulk temperature. Following NIR irradiation, the enzyme activity was tailored rapidly and reversibly, and was modulated by varying laser power density and irradiation time. Four enzymes were engineered, including glucoamylase, glucose oxidase, catalase, and proteinase K with NIR-light sensitivity, and demonstrated their utility in practical applications such as photolithography and NIR light-responsive antibacterial or anticancer actions. Our investigation suggests that this approach could be broadly used to engineer enzymes with NIR-light sensitivity for many biological applications.

show abstract

A Simple Method for Measuring Ground-Level Ozone in the Atmosphere

Cited by 10 publications

References 11 publications

Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

An Undergraduate Experiment to Investigate Air Pollutants Created from Lightning

Dynamic Modulation of Enzyme Activity by Near‐Infrared Light

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