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Can we reach consensus on the dominant sulfate formation pathway in China's haze?

ABSTRACT: Atmospheric sulfate aerosols contribute significantly to air pollution and climate change. Sulfate formation mechanisms during winter haze events in northern China have recently received considerable attention, with more than 10 studies published in high-impact journals. However, the conclusions from in-field measurements, laboratory studies, and numerical simulations are inconsistent and even contradictory. Here, we propose a physically based yet simple method to clarify the debate on the dominant sulfate formation pathway. Based on the hazes evolving in the synoptic scale, first, a characteristic sulfate formation rate is derived using the Eulerian mass conservation equation constrained by in situ observations. Then, this characteristic value is treated as a guideline to determine the dominant sulfate formation pathway with a 0D chemical box model. Our observation-derived results establish a linkage between studies from laboratory experiments and chemical transport model simulations. A convergent understanding could therefore be reached on sulfate formation mechanisms in China's wintertime haze. This method is universal and can be applied to various haze conditions and different secondary products.

SUBMITTER: Liu M

PROVIDER: S-EPMC11299981 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Can we reach consensus on the dominant sulfate formation pathway in China's haze?

Liu Mingxu M Song Yu Y Wang Tiantian T Dang Xinyi X Shang Fang F Jin Xipeng X Du Mile M Wang Weigang W Sun Yele Y Zhang Qiang Q Kang Ling L Cai Xuhui X Zhang Hongsheng H Zhu Tong T

PNAS nexus 20240725 8

Atmospheric sulfate aerosols contribute significantly to air pollution and climate change. Sulfate formation mechanisms during winter haze events in northern China have recently received considerable attention, with more than 10 studies published in high-impact journals. However, the conclusions from in-field measurements, laboratory studies, and numerical simulations are inconsistent and even contradictory. Here, we propose a physically based yet simple method to clarify the debate on the domin ...[more]

PMID: 39108300

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Project description:Protein haze formation in bottled wines is a significant concern for the global wine industry, and wine clarification before bottling is therefore a common but expensive practice. Previous studies have shown that wine yeast strains can reduce haze formation through the secretion of certain mannoproteins, but it has been suggested that other yeast-dependent haze protective mechanisms exist. On the other hand, the addition of chitin has been shown to reduce haze formation, likely because grape chitinases have been shown to be the major contributors to haze. In this study, Chardonnay grape must fermented by various yeast strains resulted in wines with different protein haze levels, indicating differences in haze-protective capacities of the strains. The cell wall chitin levels of these strains were determined, and a strong correlation between cell wall chitin levels and haze protection capability was observed. To further evaluate the mechanism of haze protection, Escherichia coli-produced green fluorescent protein (GFP)-tagged grape chitinase was shown to bind efficiently to yeast cell walls in a cell wall chitin concentration-dependent manner, while commercial chitinase was removed from synthetic wine in quantities that also correlated with the cell wall chitin levels of the strains. Our findings suggest a new mechanism of reducing wine haze, and we propose a strategy for optimizing wine yeast strains to improve wine clarification.IMPORTANCE In this study, we establish a new mechanism by which wine yeast strains can impact the protein haze formation of wines, and we demonstrate that yeast cell wall chitin binds grape chitinase in a chitin concentration-dependent manner. We also show that yeast can remove this haze-forming protein from wine. Chitin has in the past been shown to efficiently reduce wine haze formation when added to the wine in high concentration as a clarifying agent. Our data suggest that the selection of yeast strains with high levels of cell wall chitin can reduce protein haze. We also investigate how yeast cell wall chitin levels are affected by environmental conditions.

Project description:BackgroundVariation in perioperative care persists globally. Consensus discussions may facilitate standardisation, yet the processes used to reach agreement are poorly understood. This study aimed to develop a model for conducting local consensus discussions when implementing standardised perioperative pathways. Specifically, we 1) describe how local consensus discussions are operationalised; 2) identify what guides decision making and consensus between clinicians; and 3) formulate explanatory mechanisms and identify determinants that facilitate consensus discussions.MethodsA qualitative, modified grounded theory study was conducted in one private hospital in metropolitan Sydney, Australia. Thirty-one participants from clinical disciplines and hospital management/leadership were included. Data were collected from nine semi-structured interviews and 16 h of participant observations during consensus development or implementation meetings. Data collection and analysis occurred concurrently until theoretical saturation was achieved. Interviews and field notes were recorded and transcribed verbatim. Data were analysed using coding, constant comparison, detailed memo writing and data interpretation.ResultsSeven individual and contextual factors crucial for building consensus, and eight mechanisms for reaching agreement were identified and integrated into a conceptual model. Seeking evidence to support decision-making emerged as the primary driver of consensus. Strong research evidence in support of a pathway component facilitated swift agreement. Where there was ambiguous evidence for a pathway component, clinicians based their decisions on a desire for professional autonomy, consideration of how their peers practice, patient preferences, practices from external organisations, or the feasibility of implementing the pathway component.ConclusionsThe Consensus Model for Standardising Healthcare provides a map for healthcare organisations seeking to conduct local consensus discussions to reduce variation in care. Our findings advance our understanding of how local consensus discussions are conducted and factors that impact success when standardising care amongst clinicians.

Dataset Information

Can we reach consensus on the dominant sulfate formation pathway in China's haze?

Publications

Can we reach consensus on the dominant sulfate formation pathway in China's haze?

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