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1.
Environmental Science: Atmospheres ; 1(5):208-213, 2021.
Article in English | Scopus | ID: covidwho-1900673

ABSTRACT

The immense reduction in aerosol levels during the COVID-19 pandemic provides an opportunity to reveal how atmospheric chemistry is regulating our climate, among which the effect of aerosols on climate is a phenomenon of great interest but still in hot debate. The Intergovernmental Panel on Climate Change (IPCC) has continually identified the effect of aerosols on climate to have the largest uncertainty among the factors contributing to global climate change. Several studies indicate an inverse relationship between aerosol presence in the atmosphere and the diurnal surface air temperature range (DTR). Herein, we test this relationship by analyzing the DTR values from in situ weather station records for periods before and during the COVID-19 epidemic in Chinawhere aerosol levels have substantially reduced, compared with the climatological mean levels for a 19 year period.Our analyses find that DTRs fromFebruary to June during the COVID-19 pandemic are greater than 3 standard deviations above the climatological mean DTR. This anomaly has never occurred before in the 21st century and is at least in part associated with the observed reduction in aerosols. © 2021 The Author(s).

2.
Ccs Chemistry ; 3(1):1501-1528, 2021.
Article in English | Web of Science | ID: covidwho-1887435

ABSTRACT

Coronavirus disease 2019 (COVID-19) is caused by a novel strain of coronavirus, designated as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). It has caused a global pandemic rapidly sweeping across all countries, bringing social and economic hardship to millions. Most countries have implemented early warning measures to detect, isolate, and treat patients infected with SARS-CoV-2. This minireview summarizes some of those steps, in particular, testing methods and drug development in the context of chemical biology, and discusses the molecular basis of COVID-19's virulent transmissibility.

3.
Environmental Science & Technology Letters ; 9(1):3-9, 2022.
Article in English | Web of Science | ID: covidwho-1655414

ABSTRACT

In situ measurements have suggested vehicle emissions may dominate agricultural sources of NH3 in many cities, which is alarming given the potential for urban NH3 to significantly increase human exposure to ambient particulate matter. However, confirmation of the prevalence of vehicle NH3 throughout a city has been challenging because of mixing with agricultural sources, and the latter are thus routinely assumed to dominate. Here we report vehicle NH3 emissions based on TROPOMI NO2 and CrIS NH3 (0.152 kg s(-1)) that are consistent with a model-based estimate (0.178 kg s(-1)) and show that COVID-19 lockdowns provide a unique opportunity for making the first satellite-based constraints on vehicle NH3 emissions for an entire urban region (western Los Angeles), which we find make up 60-95% of total NH3 emissions, substantially higher than the values of 13-22% in state and national inventories. This provides a new means of constraining a component of transportation emissions whose impacts may rival those of NOx yet which has been largely under-recognized and uncontrolled.

4.
Chinese Journal of Digestive Surgery ; 19(3):259-261, 2020.
Article in Chinese | Scopus | ID: covidwho-825799

ABSTRACT

At present, the prevention and control situation of epidemics of Corona Virus Disease 2019 (COVID-19) is still serious, medical institutions should provide quality and safe routine medical services while doing their best in the prevention and control of this disease. The purpose of this article is to suggest a way to give quality and safe medical services to patients who need surgical treatment, especially to those who need emergency surgical treatment, with strict classified managements and standard precaution during perioperative period. With those suggestions, we may reduce the incidence of nosocomial infection and contribute to the prevention and control of COVID-19. Copyright © 2020 by the Chinese Medical Association.

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