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The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
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Microorganisms are pivotal agents in Earth's biogeochemical cycles, significantly influencing climate dynamics through their metabolic activities. These microbes modulate the levels of key greenhouse gases by both contributing to and helping mitigate climate change.Microbial Contributions to Greenhouse Gas EmissionsRising global temperatures accelerate microbial metabolism, which, in turn, speeds up the decomposition of organic matter. This process releases carbon dioxide (CO₂) through...
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The low reactivity in alkanes can be attributed to the non-polar nature of C–C and C–H σ bonds. Alkanes, therefore, were  initially termed as “paraffins,” derived from the Latin words: parum, meaning “too little,” and affinis, meaning “affinity.”
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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Changes in air composition driven by differences in biofuel consumption.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Public Health

Background:

  • São Paulo's air quality is primarily impacted by vehicular emissions.
  • Brazil's unique biofuel usage influences its vehicle fleet's pollution profile.
  • Understanding pollution dynamics during and after COVID-19 lockdowns is crucial.

Purpose of the Study:

  • To investigate changes in PM2.5 sources and concentrations in São Paulo.
  • To compare air pollution levels during initial lockdown (2020) and post-reopening (2022).
  • To assess the impact of economic reopening on air quality and associated health risks.

Main Methods:

  • Source apportionment of PM2.5 using the FA-MLR approach.
  • Analysis of various pollutants including ions, elements, and polycyclic aromatic hydrocarbons (PAHs).
  • Comparison of pollutant concentrations between 2020 and 2022, referencing pre-pandemic data.

Main Results:

  • Biomass burning was the dominant PM2.5 source in 2020; vehicular traffic dominated in 2022.
  • Pollutant levels generally decreased in 2020 but rebounded to pre-pandemic levels by 2022.
  • Copper and Molybdenum linked to traffic unexpectedly decreased due to shifts in fuel consumption.

Conclusions:

  • Economic reopening in São Paulo led to a resurgence of vehicular pollution.
  • Biomass burning remained a consistent pollution source, unaffected by social distancing.
  • Increased exposure to carcinogenic species in 2022 poses significant health risks.