[Pollution Characteristics and Sources of Wintertime Atmospheric Brown Carbon at a Background Site of the Yangtze River Delta Region in China].

To investigate the pollution characteristics and sources of atmospheric brown carbon (BrC) in Chongming Island, a background site of the Yangtze River Delta (YRD) region in China, PM samples collected from December 2018 to January 2019 were analyzed to determine their chemical compositions and optical properties. The results showed that the light absorption coefficient (Abs) of BrC extracted by methanol at 365 nm was (5.39±3.

Spatial and Temporal Distributions and Sources of Anthropogenic NMVOCs in the Atmosphere of China: A Review.

As the key precursors of O, anthropogenic non-methane volatile organic compounds (NMVOCs) have been studied intensively. This paper performed a meta-analysis on the spatial and temporal variations of NMVOCs, their roles in photochemical reactions, and their sources in China, based on published research. The results showed that both non-methane hydrocarbons (NMHCs) and oxygenated VOCs (OVOCs) in China have higher mixing ratios in the eastern developed cities compared to those in the central and western areas.

Summertime atmospheric dicarboxylic acids and related SOA in the background region of Yangtze River Delta, China: Implications for heterogeneous reaction of oxalic acid with sea salts.

The diacid chemistry of summertime PM and the size-segregated aerosols (9-stages) in Chongming Island, a coastal site in the Yangtze River Delta (YRD), China, were investigated. Our results showed that oxalic acid (C) was the dominant dicarboxylic acid, followed by succinic acid (C), malonic acid (C), adipic acid (C) and phthalic acid (Ph). Two types of haze pollution events were identified during the sampling period, i.

Enhanced photochemical formation of secondary organic aerosols during the COVID-19 lockdown in Northern China.

To eliminate the spread of a novel coronavirus breaking out in the end of 2019 (COVID-19), the Chinese government has implemented a nationwide lockdown policy after the Chinese lunar New Year of 2020, resulting in a sharp reduction in air pollutant emissions. To investigate the impact of the lockdown on aerosol chemistry, the number fraction, size distribution and formation process of oxalic acid (C) containing particles and its precursors were studied using a single particle aerosol mass spectrometer (SPAMS) at the urban site of Liaocheng in the North China Plain (NCP). Our results showed that five air pollutants (i.

Area epidemiological research on hypertension risk factors of Keriyans in the Taklimakan Desert.

Introduction: The Keriyans live in the hot, arid areas of Taklimakan Desert and maintain a primitive way of life. They have a low incidence of hypertension. However, little is known about the adaptive compensation in the organism.

Smoking dose modifies the association between C242T polymorphism and prevalence of metabolic syndrome in a Chinese population.

Background: The C242T polymorphism of the CYBA gene that encodes p22phox, a component of NADPH oxidase, has been found to modulate superoxide production. Oxidase is a major source of the superoxide anion that contributes to individual components of metabolic syndrome. We examined the relationship of the C242T polymorphism with the prevalence of metabolic syndrome in a Chinese population, taking account of consumed cigarette amounts.

Periostin gene polymorphisms, protein levels and risk of incident coronary artery disease.

Vascular endothelial growth factor and its receptor the kinase domain receptor play critical roles in the pathogenesis of coronary artery disease. Periostin is an up-regulator of kinase domain receptor expression. The purpose of this study was to determine whether polymorphisms in periostin are associated with the risk of coronary artery disease.

Associations among periostin gene polymorphisms, clinical parameters and heart failure: a case-control study in 1104 Chinese individuals.

Aims: To determine the associations among periostin gene polymorphisms, clinical parameters and heart failure in a Chinese population.

Methods: In total, 464 patients with heart failure and 640 control individuals were included in this study. rs3829365 and rs1028728 were genotyped through PCR and restriction fragment length polymorphism.

A novel approach to transplanting bone marrow stem cells to repair human myocardial infarction: delivery via a noninfarct-relative artery.

Bone marrow stem cells are able to repair infarcted human myocardium following intracoronary transplantation via the infarct-relative artery. However, traditional reperfusion strategies fail to open the artery in some patients, making effective delivery impossible. Our previous study demonstrated a safe and efficient approach to delivering bone marrow stem cells via a noninfarcted artery in an animal myocardial infarction model.