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Cleaner water through corn
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Environmental News Network - California s Worst Wildfires Are Helping Improve Air Quality Prediction
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University of California - Riverside
UC Riverside engineers are developing methods to estimate the impact of California’s destructive wildfires on air quality in neighborhoods affected by the smoke from these fires. Their research, funded by NASA and the results published in Atmospheric Pollution Research, fills in the gaps in current methods by providing air quality information at the neighborhood scales required by public health officials to make health assessments and evacuation recommendations.
Measurements of air quality depend largely on ground-based sensors that are typically spaced many miles apart. Determining how healthy it is to breathe air is straightforward in the vicinity of the sensors but becomes unreliable in areas in between sensors.
Researchers Observe Picosecond Charge Transfer in Peptides
Written by AZoMApr 15 2021
The transfer of electrons between molecules forms the basis of biological energy flows, for example, in photosynthesis and respiration.
The extended peptide (top) does not mediate charge transfer (detectable charge transfer). The folded peptide (bottom) mediates picosecond charge transfer along the hydrogen bonds between the donor and the acceptor (the hydrogen bonds are indicated with thin red dotted lines). Image Credit: Valentine Vullev.
Although electron transfer is crucial for sustaining life, factors that determine its rate, particularly over long distances, are not clearly understood since the systems that mediate these ultrafast processes are highly complicated.
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Biological energy flows, such as in photosynthesis and respiration, depend on the transfer of electrons from one molecule to another. Despite its importance to sustaining life, factors governing the rate of electron transfer, especially over long distances, are not well understood because the systems that mediate such ultrafast processes are very complex. A better understanding of electron transfer rates would help scientists improve chemical transformations, energy conversion, electronic devices, and photonic technologies.
Now, an international team of researchers led by UC Riverside has observed picosecond charge transfer mediated by hydrogen bonds in peptides. A picosecond is one trillionth of a second. As short-chain analogs of proteins, crucially important building blocks of living organisms, peptides are chains of chemically linked amino acids. The discovery shows the role of hydrogen bonds in electron transfer. The results are published in
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