2,885 results match your criteria component particulate


Seasonal variations in atrazine degradation in a typical semienclosed bay of the northwest Pacific ocean.

Environ Pollut 2021 Apr 7;283:117072. Epub 2021 Apr 7.

The First Institute of Oceanography, State Oceanic Administration, 6 Xianxialing Road, Qingdao, 266061, China.

Pesticides are widely used to alleviate pest pressure in agricultural systems, and atrazine is a typical diffuse pollutant and serves a sensitivity index for environmental characteristics. Based on the physicochemical properties of parent substances, degradation products of pesticides may pose a greater threat to aquatic ecosystems than pesticides. Atrazine and three primary degradation products (deethylatrazine (DEA), deisopropylatrazine (DIA) and didealkylatrazine (DDA)) were investigated in a semienclosed bay of the western Pacific Ocean. Read More

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Aerosol components associated with hospital mortality in systemic sclerosis: an analysis from a nationwide Thailand healthcare database.

Sci Rep 2021 Apr 12;11(1):7983. Epub 2021 Apr 12.

Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, 40002, Thailand.

Occupational and environmental associations with systemic sclerosis (SSc) have been confirmed; however, the association between aerosol components and mortality is uncertain. The study aimed to define the association between aerosol components and hospital mortality among Thai SSc patients. A study was conducted using a national database of patients covered by the National Health Security Office, hospitalised between 2014 and 2018. Read More

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Long-Term Exposure to Fine Particle Elemental Components and Natural and Cause-Specific Mortality-a Pooled Analysis of Eight European Cohorts within the ELAPSE Project.

Environ Health Perspect 2021 Apr 12;129(4):47009. Epub 2021 Apr 12.

Institute for Risk Assessment Sciences, Utrecht University, Utrecht, Netherlands.

Background: Inconsistent associations between long-term exposure to particles with an aerodynamic diameter [fine particulate matter ()] components and mortality have been reported, partly related to challenges in exposure assessment.

Objectives: We investigated the associations between long-term exposure to elemental components and mortality in a large pooled European cohort; to compare health effects of components estimated with two exposure modeling approaches, namely, supervised linear regression (SLR) and random forest (RF) algorithms.

Methods: We pooled data from eight European cohorts with 323,782 participants, average age 49 y at baseline (1985-2005). Read More

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Assessment of Pollution and Health Risks of Heavy Metals in Particulate Matter and Road Dust Along the Road Network of Dhanbad, India.

J Health Pollut 2021 Mar 2;11(29):210305. Epub 2021 Mar 2.

Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand -826004 (India).

Background: The rise in particulate matter (PM) concentrations is a serious problem for the environment. Heavy metals associated with PM, PM, and road dust adversely affect human health. Different methods have been used to assess heavy metal contamination in PM, PM, and road dust and source apportionment of these heavy metals. Read More

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Exposure to fine particulate matter-bound polycyclic aromatic hydrocarbons, male semen quality, and reproductive hormones: The MARCHS study.

Environ Pollut 2021 Mar 20;280:116883. Epub 2021 Mar 20.

Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing, China. Electronic address:

Exposure to outdoor fine particulate matter (PM)-bound polycyclic aromatic hydrocarbons (PAHs) is linked to reproductive dysfunction. However, it is unclear which component of PAHs is responsible for the adverse outcomes. In the Male Reproductive Health in Chongqing College Students (MARHCS) cohort study, we measured the exposure levels of 16 PAHs by collecting air PM particles and assessed eight PAHs metabolites from four parent PAHs, including naphthalene, fluorene, phenanthrene, and pyrene in urine samples. Read More

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Chronic lung inflammation and pulmonary fibrosis after multiple intranasal instillation of PM in mice.

Environ Toxicol 2021 Mar 29. Epub 2021 Mar 29.

Department of Pulmonary and Critical Care Medicine, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai, China.

Fine particulate matter (PM ) is an important component of air pollution and can induce lung inflammation and oxidative stress. We hypothesized that PM could play a role in the induction of pulmonary fibrosis. We examined whether multiple intranasal instillation of PM can induce pulmonary fibrosis in the mouse, and also investigated the underlying pro-fibrotic signaling pathways. Read More

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Particulates induced lung inflammation and its consequences in the development of restrictive and obstructive lung diseases: a systematic review.

Environ Sci Pollut Res Int 2021 Mar 29. Epub 2021 Mar 29.

Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

Particulate matters (PMs) are significant components of air pollution in the urban environment. PMs with aerodynamic diameter less than 2.5 μm (PM) can penetrate to the alveolar area and introduce numerous compounds to the pneumocystis that can initiate inflammatory response. Read More

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"Periimplant Mucositis" Secondary to Infection of Residual Bone Allograft Embedded in the Periimplant Sulcus of a Patient with Diabetes: A Case Report.

Authors:
Jonathan H Do

Clin Adv Periodontics 2021 Mar 27. Epub 2021 Mar 27.

Section of Periodontics, UCLA School of Dentistry, Los Angeles, California.

Introduction: Currently, inflammation of tissue around implants is diagnosed as either periimplant mucositis or periimplantitis, and the etiology is bacterial biofilm colonization of the implant and its transmucosal component. The purpose of this manuscript is to report a case of "periimplant mucositis" secondary to infection of a residual bone allograft embedded in the periimplant sulcus of a patient with diabetes.

Case Presentation: A #8 implant was placed and provisionalized in a 46-year-old male patient. Read More

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Gaseous and particulate reactive nitrogen species in the indoor air of selected households in New Delhi.

Environ Monit Assess 2021 Mar 27;193(4):231. Epub 2021 Mar 27.

School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India.

The present study reports the indoor abundance of inorganic trace gases (NH, NO and SO) and their corresponding particulates (NH, NO and SO) along with other major ionic species present in the aerosol form (Cl, F, Na, K, Ca and Mg), in the urban households of megacity Delhi (India). Two different households (DH site and MH site) were selected in the city based on the variation in the land use patterns of the locations in which they were situated. Trace gases followed the order NH > SO > NO at both the sites with NH contributing about 90% and 85% to the total Nr species at DH and MH sites, respectively. Read More

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Contribution of Long-Term Exposure to Outdoor Black Carbon to the Carcinogenicity of Air Pollution: Evidence regarding Risk of Cancer in the Gazel Cohort.

Environ Health Perspect 2021 Mar 24;129(3):37005. Epub 2021 Mar 24.

Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail) - UMR_S 1085, Rennes, France.

Background: Black carbon (BC), a component of fine particulate matter [particles with an aerodynamic diameter ()], may contribute to carcinogenic effects of air pollution. Until recently however, there has been little evidence to evaluate this hypothesis.

Objective: This study aimed to estimate the associations between long-term exposure to BC and risk of cancer. Read More

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Air-Filtering Masks for Respiratory Protection from PM and Pandemic Pathogens.

One Earth 2020 Nov;3(5):574-589

Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, USA.

Air-filtering masks, also known as respirators, protect wearers from inhaling fine particulate matter (PM) in polluted air, as well as airborne pathogens during a pandemic, such as the ongoing COVID-19 pandemic. Fibrous medium, used as the filtration layer, is the most essential component of an air-filtering mask. This article presents an overview of the development of fibrous media for air filtration. Read More

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November 2020

Nicotine dosimetry and stability in cambridge filter PADs (CFPs) following different smoking regime protocols and storage conditions.

Regul Toxicol Pharmacol 2021 Mar 18;122:104917. Epub 2021 Mar 18.

Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", Via S. Sofia, 87, 95123, Catania, Italy; Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Via S. Sofia, 97, 95123, Catania, Italy. Electronic address:

Despite the growing numbers of studies on cigarettes and electronic nicotine delivery products (ENDs), no standard assessment of nicotine stability in various matrix post exposure is currently available. The aim of the present study was to evaluate the optimal standard condition to store Cambridge Filter Pads (CFPs) before chemical analysis in order to guarantee the titer of nicotine.We further performed data normalization according to different smoking or vaping runs. Read More

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Chemical characteristics and source apportionment of PM in a petrochemical city: Implications for primary and secondary carbonaceous component.

J Environ Sci (China) 2021 May 5;103:322-335. Epub 2020 Dec 5.

State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Science, Xiamen 361021, China; University of Chinese Academy of Science, Beijing 100049, China.

To study the pollution features and underlying mechanism of PM in Luoyang, a typical developing urban site in the central plain of China, 303 PM samples were collected from April 16 to December 29, 2015 to analyze the elements, water soluble inorganic ions, organic carbon and elemental carbon. The annual mean concentration of PM was 142.3 μg/m, and 75% of the daily PM concentrations exceeded the 75 μg/m. Read More

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[Pollution Characteristics and Chromophore Types of Brown Carbon in Xi'an].

Huan Jing Ke Xue 2021 Mar;42(3):1236-1244

College of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.

To explore the optical characteristics and chemical composition of atmospheric brown carbon (BrC) in Xi'an, particulate phase and gas phase atmospheric samples were collected using an atmospheric particulate sampler and adsorbent, and the samples were analyzed using an ultraviolet-visible spectrophotometer and a three-dimensional (3D) fluorescence photometer. The absorption and fluorescence properties of BrC were analyzed using the parallel factor analysis (PARAFAC) method to obtain type and compositional information. The results show that at a wavelength of 365 nm, the absorbances of the BrC particulate and the gas phases were (13. Read More

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[Characterization, Sources, and Health Risks of PM-bound PAHs During Autumn and Winter in Luoyang City].

Huan Jing Ke Xue 2021 Feb;42(2):595-603

College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.

In this study, PM samples were collected synchronously at Gaoxin and Linxiao in Luoyang City during autumn and winter (4 October 2018 to 30 January 2019). Sixteen priority polycyclic aromatic hydrocarbons (PAHs) associated with fine particulate matter were analyzed by gas chromatography mass spectrometry (GC-MS). The concentrations and composition characteristics of the PAHs on clean and polluted days were studied. Read More

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February 2021

[Source Apportionment and Optical Properties of Fine Particles Associated with Regional Pollution in the Yangtze River Delta].

Huan Jing Ke Xue 2021 Feb;42(2):556-563

Key Laboratory of Meteorological Disaster, Ministry of Education(KLME), Joint International Research Laboratory of Climate and Environment Change(ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China.

In order to study the distribution and optical characteristics of fine particulate matter pollution in the Yangtze River Delta, PM samples were collected and analyzed from city (Suzhou), suburb (Nanjing), and regional background monitoring stations (Lin'an). The average concentrations of PM in Suzhou, Nanjing, and Lin'an were (169.8±56. Read More

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February 2021

Formation and evolution of the nanoparticle environmental corona: The case of Au and humic acid.

Sci Total Environ 2021 May 27;768:144792. Epub 2021 Jan 27.

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain; Universitat Autònoma de Barcelona (UAB), Campus UAB, 08193, Bellaterra, Barcelona, Spain; Vall d'Hebron Institut de Recerca (VHIR), 08035 Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), P. Lluís Companys 23, 08010 Barcelona, Spain. Electronic address:

Studying the behaviour of nanomaterials after their release into natural water is essential to understand the risk associated to their environmental exposure. In particular, the interaction and adsorption of dissolved organic matter onto nanoparticles strongly influence the behaviour and fate of nanomaterials in natural water systems. We herein study the interaction of Au and Ag nanoparticles and humic acids, the principal component of natural dissolved organic matter. Read More

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Critical range of soil organic carbon in southern Europe lands under desertification risk.

J Environ Manage 2021 Jun 13;287:112285. Epub 2021 Mar 13.

Dipartimento di Scienze e Tecnologie Ambientali, Biologiche e Farmaceutiche, Università degli Studi della Campania Luigi Vanvitelli, via Vivaldi 43, 81100, Caserta, Italy. Electronic address:

Soil quality is fundamental for ecosystem long term functionality, productivity and resilience to current climatic changes. Despite its importance, soil is lost and degraded at dramatic rates worldwide. In Europe, the Mediterranean areas are a hotspot for soil erosion and land degradation due to a combination of climatic conditions, soils, geomorphology and anthropic pressure. Read More

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Major atmospheric particulate matter sources for glaciers in Coquimbo Region, Chile.

Environ Sci Pollut Res Int 2021 Mar 12. Epub 2021 Mar 12.

Departamento de Ingeniería Química y Bioprocesos, Pontificia Universidad Católica de Chile, Santiago, Chile.

Tapado Glacier is a subtropical mountain glacier in the Coquimbo region of Chile that has been continuously retreating during the last 60 years due to diminishing precipitation rates and rising temperatures and likely due to a currently unknown influence from atmospheric pollutant deposition. Climatic and meteorological impacts on this, and other, Andean glacier have been previously studied; however, cryosphere changes driven by aerosols are still largely unknown. To contribute to the understanding of the origin of aerosols and their dispersion, this study aims to identify natural and anthropogenic sources of air pollution deposited on the Tapado Glacier (4500-5536 m a. Read More

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Modelling of impact of presence/absence of suspended particulate organic matter from river and sea and effluent wastewater on fluorescence signal in the coastal area of Gapeau River.

Environ Sci Pollut Res Int 2021 Mar 11. Epub 2021 Mar 11.

Université de Toulon, Aix Marseille Univ, CNRS, IRD, MIO - CS 60584, Toulon, 83041 CEDEX 9, France.

Organic matter has an important role in biogeochemistry in aquatic environments. This study investigated impact of suspended particulate organic matter (SPOM) on fluorescence signal of mixtures of three water types (river water RW, sea water SW, effluent wastewater WW) using fluorescence (excitation-emission matrix, EEM) spectroscopy and parallel factor analysis (PARAFAC) and multilinear regression. Four irradiation experiments (Expt-1, Expt-2, Expt-3, and Expt-4) were conducted during different times of the year ( two in autumn, one in winter, and one in spring season). Read More

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Covalent N-arylation by the pollutant 1,2-naphthoquinone activates the EGF receptor.

J Biol Chem 2021 Mar 8:100524. Epub 2021 Mar 8.

Department of Medicinal Pharmacology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8530, Japan. Electronic address:

The epidermal growth factor receptor (EGFR) is the most intensively investigated receptor tyrosine kinase. Several EGFR mutations and modifications have been shown to lead to abnormal self-activation, which plays a critical role in carcinogenesis. Environmental air pollutants, which are associated with cancer and respiratory diseases, can also activate EGFR. Read More

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Marine Group-II archaea dominate particle-attached as well as free-living archaeal assemblages in the surface waters of Kongsfjorden, Svalbard, Arctic Ocean.

Antonie Van Leeuwenhoek 2021 May 10;114(5):633-647. Epub 2021 Mar 10.

Arctic Division, National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Vasco-da-Gama, Goa, India.

Marine archaea are a significant component of the global oceanic ecosystems, including the polar oceans. However, only a few attempts have been made to study archaea in the high Arctic fjords. Given the importance of Archaea in carbon and nitrogen cycling, it is imperative to explore their diversity and community composition in the high Arctic fjords, such as Kongsfjorden (Svalbard). Read More

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Effects of Nicotine and Tobacco-Related Products on the Feeding Behavior of the German Cockroach (Blattodea: Blattellidae).

J Insect Sci 2021 Mar;21(2)

Biointeractions and Crop Protection Department, Rothamsted Research, Harpenden, Hertfordshire, UK.

Animals use olfaction to detect developmentally significant volatile organic compounds (VOCs) in their local environment. As part of a wider study aiming to demonstrate that the olfactory responses of animals to VOCs can be modified through the creation of a drug-addicted status and association with a selected VOC, we investigated nicotine and tobacco smoke particulate (TSP) extract as possible addictive compounds for male German cockroaches, Blattella germanica (Linnaeus). In feeding experiments using an artificial food stimulus, food treated with TSP extract was preferred over untreated food. Read More

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Bioavailability of heavy metals bounded to PM in Xi'an, China: seasonal variation and health risk assessment.

Environ Sci Pollut Res Int 2021 Mar 6. Epub 2021 Mar 6.

Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.

Studying the characteristics and health risks of heavy metals in atmospheric fine particulate matter (PM) is a crucial component of understanding atmospheric pollution in China. Integrated 24 h PM samples were collected in winter and summer 2016 in Xi'an, China. The pollution levels, speciation, and health risks of seven PM-bound metal elements (Al, As, Cd, Cr, Ni, Pb, and Zn) were investigated in this study. Read More

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Mitigation potential of black carbon emissions from on-road vehicles in China.

Environ Pollut 2021 Feb 13;278:116746. Epub 2021 Feb 13.

School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing, 100084, China; Beijing Laboratory of Environmental Frontier Technologies, Tsinghua University, Beijing, 100084, PR China. Electronic address:

Black carbon (BC) is the most potent light-absorbing component of particulate matter and can have a significant warming impact. On-road vehicles are a major source of BC and a significant contributor to global warming. This paper establishes an updated inventory to quantify the mitigation potential of efforts to control BC emissions from on-road transportation in China. Read More

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February 2021

Toxicological Responses of α-Pinene-Derived Secondary Organic Aerosol and Its Molecular Tracers in Human Lung Cell Lines.

Chem Res Toxicol 2021 Mar 2;34(3):817-832. Epub 2021 Mar 2.

Institute of Physical Chemistry, Polish Academy of Sciences, 00Kasprzaka 44/52, 01-224 Warsaw, Poland.

Secondary organic aerosol (SOA) is a major component of airborne fine particulate matter (PM) that contributes to adverse human health effects upon inhalation. Atmospheric ozonolysis of α-pinene, an abundantly emitted monoterpene from terrestrial vegetation, leads to significant global SOA formation; however, its impact on pulmonary pathophysiology remains uncertain. In this study, we quantified an increasing concentration response of three well-established α-pinene SOA tracers (pinic, pinonic, and 3-methyl-1,2,3-butanetricarboxylic acids) and a full mixture of α-pinene SOA in A549 (alveolar epithelial carcinoma) and BEAS-2B (bronchial epithelial normal) lung cell lines. Read More

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Mechanistic Insights into the Role of Iron, Copper, and Carbonaceous Component on the Oxidative Potential of Ultrafine Particulate Matter.

Chem Res Toxicol 2021 Mar 2;34(3):767-779. Epub 2021 Mar 2.

Department of Chemistry, University of Torino, Torino 10125, Italy.

Transition metals play a key role in the pathogenic potential of urban particulate matter (PM). However, air quality regulations include exposure limits only for metals having a known toxic potential like Pb, As, Cd, and Ni, neglecting other transition metals like Fe and Cu. Fe and Cu are mainly found in the water-soluble fraction of PM. Read More

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Tracing Riverine Particulate Black Carbon Sources in Xijiang River Basin: Insight from Stable Isotopic Composition and Bayesian Mixing Model.

Water Res 2021 Apr 14;194:116932. Epub 2021 Feb 14.

Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China. Electronic address:

Rivers transport abundant terrestrial carbon into the ocean, constituting a fundamental channel between terrestrial carbon pools and oceanic carbon pools. The black carbon (BC) derived from biomass and fossil fuel combustion is an important component of the riverine organic carbon flux. A recent study estimated that approximately 17 ~ 37 Tg C of BC was delivered in suspended particle phase by rivers per year. Read More

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