keyword
MENU ▼
Read by QxMD icon Read
search

aerosol

keyword
https://www.readbyqxmd.com/read/28214272/fungal-monitoring-of-the-indoor-air-of-the-museo-de-la-plata-herbarium-argentina
#1
Andrea C Mallo, Lorena A Elíades, Daniela S Nitiu, Mario C N Saparrat
BACKGROUND: Biological agents, such as fungal spores in the air in places where scientific collections are stored, can attack and deteriorate them. AIMS: The aim of this study was to gather information on the indoor air quality of the Herbarium of Vascular Plants of the Museo de Ciencias Naturales de La Plata, Argentina, in relation to fungal propagules and inert particles. METHODS: This study was made using a volumetric system and two complementary sampling methods: (1) a non-viable method for direct evaluation, and (2) a viable method by culture for viable fungal propagules...
February 14, 2017: Revista Iberoamericana de Micología
https://www.readbyqxmd.com/read/28213470/higher-mini-bal-total-protein-concentration-in-early-ards-predicts-faster-resolution-of-lung-injury-measured-by-more-ventilator-free-days
#2
Carolyn M Hendrickson, Jason Abbott, Hanjing Zhuo, Kathleen D Liu, Carolyn S Calfee, Michael A Matthay
The protein concentration of alveolar edema fluid in acute respiratory distress syndrome (ARDS) is dynamic. It reflects alveolar flooding during acute injury as well as fluid and protein clearance over time. We hypothesized that among ARDS patients treated with low tidal volume ventilation, higher concentrations of protein in mini-bronchoalveolar lavage (mBAL) samples would predict slower resolution of lung injury and worse clinical outcomes. Total protein and IgM concentrations in Day 0 mBAL samples from 79 subjects enrolled in the aerosolized albuterol (ALTA) ARDS Network Albuterol trial were measured by colorimetric assay and ELISA respectively...
February 17, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28213277/fluorescence-and-computed-tomography-for-assessing-the-biodistribution-of-sirna-after-intratracheal-application-in-mice
#3
Antonia Geyer, Cornelia Lorenzer, Sebastian Gehrig, Manuela Simlinger, Johannes Winkler, Haider Sami, Manfred Ogris
Pulmonary delivery of nucleic acids opens the possibility for direct treatment of lung diseases, like fibrosis, cancer, and infections. Lung retention and biodistribution of nucleic acids remain important issues for the development of suitable therapeutic approaches. Moreover, monitoring the dynamic biodistribution processes of siRNA after aerosol delivery can help in identifying bottlenecks and optimising therapeutic concepts. We investigated dynamic biodistribution events after intratracheal application of chemically stabilised siRNA labeled with near infrared emitting dye AlexaFluor750 (AF750)...
February 14, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28212349/household-dengue-prevention-interventions-expenditures-and-barriers-to-aedes-aegypti-control-in-machala-ecuador
#4
Naveed Heydari, David A Larsen, Marco Neira, Efraín Beltrán Ayala, Prissila Fernandez, Jefferson Adrian, Rosemary Rochford, Anna M Stewart-Ibarra
The Aedes aegypti mosquito is an efficient vector for the transmission of Zika, chikungunya, and dengue viruses, causing major epidemics and a significant social and economic burden throughout the tropics and subtropics. The primary means of preventing these diseases is household-level mosquito control. However, relatively little is known about the economic burden of Ae. aegypti control in resource-limited communities. We surveyed residents from 40 households in a high-risk community at the urban periphery in the city of Machala, Ecuador, on dengue perceptions, vector control interventions, household expenditures, and factors influencing purchasing decisions...
February 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28211328/excretion-characteristics-of-tetrabromobisphenol-a-in-wistar-rats-following-mouth-and-nose-inhalation-exposure
#5
Yunjiang Yu, Zhengdong Wang, Qiong Wang, Mingdeng Xiang, Yanping Zhang, Qingzhi Ge, Liangzhong Li, Hui Li, Ruixue Ma
Tetrabromobisphenol-A (TBBPA), a brominated flame retardant with the largest production volume worldwide, is employed as a reactive and additive flame retardant, and also as an intermediate in the production of other retardants. The constant release of TBBPA into the environment has attracted increasing attention to its potent health effects. To date, the vast majority of health-related research on TBBPA has focused on oral exposure. This study aims to explore the excretion characteristics of TBBPA in living organisms following inhalation exposure...
February 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/28210808/change-in-oxygen-consumption-following-inhalation-of-albuterol-in-comparison-with-levalbuterol-in-healthy-adult-volunteers
#6
Manpreet K Virk, Justin Hotz, Robinder G Khemani, Christopher J L Newth, Patrick A Ross
BACKGROUND: Albuterol is the most commonly used β agonist to treat reversible lower airway obstruction. Albuterol contains a racemic mixture of two enantiomers. Levalbuterol contains the single R form enantiomer. Levalbuterol is frequently prescribed to limit cardiovascular toxicity. OBJECTIVE: We examined changes in oxygen consumption (V'O2) and heart rate (HR) following administration of albuterol and levalbuterol. METHODS: This is a prospective, randomized, single-blinded, controlled study of healthy adult volunteers...
February 16, 2017: Lung
https://www.readbyqxmd.com/read/28209048/waste-exposure-and-skin-diseases
#7
Matteo Megna, Maddalena Napolitano, Claudia Costa, Nicola Balato, Cataldo Patruno
Waste is a composite mixture of different substances including endotoxins, organic dust and bio-aerosol stuffed with micro-organisms, as well as various toxic organic and inorganic chemicals, which may be intrinsically hazardous to human health. Therefore, health risks may derive from direct or indirect contact with garbage. Although few epidemiological and clinical surveys investigated on the adverse effects of garbage exposure on human health, particularly regarding respiratory, gastrointestinal, musculoskeletal and mucous membranes systems, only very limited data are available on the relationship between waste exposure and cutaneous diseases...
February 16, 2017: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
https://www.readbyqxmd.com/read/28208413/friction-factor-for-aerosol-fractal-aggregates-over-the-entire-knudsen-range
#8
James Corson, George W Mulholland, Michael R Zachariah
We develop an approach for computing the hydrodynamic friction tensor and scalar friction coefficient for an aerosol fractal aggregate in the transition regime. Our approach involves solving the Bhatnagar-Gross-Krook equation for the velocity field around a sphere and using the velocity field to calculate the force on each primary sphere in the aggregate due to the presence of the other spheres. It is essentially an extension of Kirkwood-Riseman theory from the continuum flow regime to the entire Knudsen range (Knudsen number from 0...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28203645/saharan-dust-detection-using-multi-sensor-satellite-measurements
#9
Sriharsha Madhavan, John J Qu, X Hao
Contemporary scientists have vested interest in trying to understand the climatology of the North Atlantic Basin since this region is considered as the genesis for hurricane formation that eventually get shipped to the tropical Atlantic region and the Caribbean. The effects of atmospheric water cycle and the climate of West Africa and the Atlantic basin are hugely impacted by the radiative forcing of Saharan dust. The focus area in this paper would be to improve the dust detection schemes by employing the use of multi sensor measurements in the thermal emissive wavelengths using legacy sensors such as Terra (T) and Aqua (A) MODerate-resolution Imaging Spectroradiometer (MODIS), fusing with Ozone Monitoring Instrument (OMI)...
February 2017: Heliyon
https://www.readbyqxmd.com/read/28202226/air-pollution-pm2-5-composition-source-factors-and-respiratory-symptoms-in-asthmatic-and-nonasthmatic-children-in-santiago-chile
#10
Laura Prieto-Parra, Karla Yohannessen, Cecilia Brea, Daniella Vidal, Carlos A Ubilla, Pablo Ruiz-Rudolph
The objective of this study was to determine the association of respiratory symptoms and medication use and exposure to various air pollutants, PM2.5 components, and source factors in a panel of asthmatic and nonasthmatic children in Santiago, Chile. To this end, 174 children (90 asthmatics and 84 nonasthmatics) were followed throughout the winter months of 2010 and 2011. During the study period, children filled out daily diaries to record respiratory symptoms and medication use. Air pollution data were obtained from government central site measurements and a PM2...
February 12, 2017: Environment International
https://www.readbyqxmd.com/read/28201870/self-organization-induced-by-self-assembly-in-microheterogeneous-reaction-diffusion-system
#11
Alexander A Cherkashin, Vladimir K Vanag
When acrylamide (AA) monomers are added to the Belousov-Zhabotinsky (BZ) reaction incorporated into nanodroplets of water-in-oil aerosol OT (AOT) microemulsion (the BZ-AOT system), free radicals produced in the BZ reaction initiate polymerization of AA monomers and polyacrylamide particles are formed. These particles change the microstructure of the AOT microemulsion thus inducing the transition from Turing patterns to new dissipative patterns which can be either stationary "black" spots or waves.
February 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28199945/contribution-of-methane-sulfonic-acid-to-new-particle-formation-in-the-atmosphere
#12
Hailiang Zhao, Xiaotong Jiang, Lin Du
Methane sulfonic acid (MSA) is present in substantial concentrations in the gas phase over oceans and coastal regions. We present an investigation into the contribution of MSA to new particle formation with the common atmospheric aerosol nucleation precursors including MSA, methanol, formic acid, acetone, dimethylether, formaldehyde, methyl formate, by making use a quantum chemical approach. Density functional theory calculations indicate that these bimolecular complexes are characterized by the presence of strong inter-molecular hydrogen bonds (SOH⋯O) with large binding energies and thermodynamic equilibrium constants...
February 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28199090/molecular-size-separated-brown-carbon-absorption-for-biomass-burning-aerosol-at-multiple-field-sites
#13
Robert A Di Lorenzo, Rebecca A Washenfelder, Alexis Rae Attwood, Hongyu Guo, Lu Xu, Nga Lee Ng, Rodney J Weber, Karsten Baumann, Eric S Edgerton, Cora J Young
Biomass burning is a known source of brown carbon aerosol in the atmosphere. We collected filter samples of biomass burning emissions at three locations in Canada and the United States, with transport times of 10 h to >3 days. We analyzed the samples with size exclusion chromatography coupled to molecular absorbance spectroscopy to determine absorbance as a function of molecular size. The majority of absorption was due to molecules >500 Da, and these contributed an increasing fraction of absorption as the biomass burning aerosol aged...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28198389/comparisons-of-aerosol-backscatter-using-satellite-and-ground-lidars-implications-for-calibrating-and-validating-spaceborne-lidar
#14
Gary Gimmestad, Haviland Forrister, Tomas Grigas, Colin O'Dowd
The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on the polar orbiter Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) is an elastic backscatter lidar that produces a global uniformly-calibrated aerosol data set. Several Calibration/Validation (Cal/Val) studies for CALIOP conducted with ground-based lidars and CALIOP data showed large aerosol profile disagreements, both random and systematic. In an attempt to better understand these problems, we undertook a series of ground-based lidar measurements in Atlanta, Georgia, which did not provide better agreement with CALIOP data than the earlier efforts, but rather prompted us to investigate the statistical limitations of such comparisons...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28197614/characterization-of-the-temperature-and-humidity-dependent-phase-diagram-of-amorphous-nanoscale-organic-aerosols
#15
Nicholas E Rothfuss, Markus D Petters
Atmospheric aerosols can exist in amorphous semi-solid or glassy phase states. These states are determined by the temperature (T) and relative humidity (RH). New measurements of viscosity for amorphous semi-solid nanometer size sucrose particles as a function of T and RH are reported. Viscosity is measured by inducing coagulation between two particles and probing the thermodynamic states that induce the particle to relax into a sphere. It is shown that the glass transition temperature can be obtained by extrapolation to 10(12) Pa s from the measured temperature-dependent viscosity in the 10(6) to 10(7) Pa s range...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28197606/the-properties-and-behavior-of-%C3%AE-pinene-secondary-organic-aerosol-particles-exposed-to-ammonia-under-dry-conditions
#16
David M Bell, Dan Imre, Scot T Martin, Alla Zelenyuk
Chemical transformations and aging of secondary organic aerosol (SOA) particles can alter their physical and chemical properties, including particle morphology. Ammonia, one of the common atmospheric reactive constituents, can react with SOA particles, changing their properties and behavior. At low relative humidity, NH3 uptake by α-pinene SOA particles appears to be limited to the particle surface, which suggests that the reacted particles might not be homogeneous and have complex morphology. Here, we present a study aimed at detailed characterization of the effect of ammonia on the composition, density, morphology, shape, and evaporation kinetics of α-pinene SOA particles...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28196298/human-to-human-transmission-of-brucella-a-systematic-review
#17
REVIEW
Felipe F Tuon, Regina B Gondolfo, Natacha Cerchiari
OBJECTIVE: The most common form of transmitting human brucellosis is through contaminated food or direct contact with infected animals. Human-to-human transmission (HHT) has been described as isolated case reports. The aim of this systematic review was to describe all cases of HHT of human brucellosis reported in the medical literature. METHODS: A literature search was conducted using PubMed, Scopus and Scielo databases using specific search terms published until March 2016...
February 14, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28195722/effects-of-relative-humidity-and-particle-phase-water-on-the-heterogeneous-oh-oxidation-of-2-methylglutaric-acid-aqueous-droplets
#18
Man Mei Chim, Chun Yin Chow, James F Davies, ManNin Chan
Organic aerosols can exist as aqueous droplets, with variable water content depending on their composition and environmental conditions (e.g. relative humidity (RH)). Recent laboratory studies have revealed that oxidation kinetics in highly concentrated droplets can be much slower from those in dilute solutions. However, it remains unclear whether particle phase water affects the formation of reaction products physically and/or chemically. In this work, we investigate the role of particle phase water on the heterogeneous chemistry of aqueous organic droplets consisting of 2-methylglutaric acid (2-MGA), measuring the reaction kinetics and the reaction products upon heterogeneous OH oxidation over a range of RH...
February 14, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28195657/pulmonary-function-and-airway-inflammation-among-dairy-parlor-workers-after-exposure-to-inhalable-aerosols
#19
Matthew W Nonnenmann, David Gimeno Ruiz de Porras, Jeffrey Levin, David Douphrate, Vijay Boggaram, Joshua Schaffer, Michael Gallagher, Madeleine Hornick, Stephen Reynolds
BACKGROUND: Inhalation exposure to organic dust causes lung inflammation among agricultural workers. Due to changes in production and work organization, task-based inhalation exposure data, including novel lung inflammation biomarkers, will inform exposure recommendations for dairy farm workers. METHODS: Linear regression was used to estimate the associations of airborne exposure to dust concentration, endotoxin, and muramic acid with pulmonary outcomes (i.e., FEV1 , exhaled nitric oxide)...
March 2017: American Journal of Industrial Medicine
https://www.readbyqxmd.com/read/28195231/solvent-chemistry-in-the-electronic-cigarette-reaction-vessel
#20
R Paul Jensen, Robert M Strongin, David H Peyton
Knowledge of the mechanism of formation, levels and toxicological profiles of the chemical products in the aerosols (i.e., vapor plus particulate phases) of e-cigarettes is needed in order to better inform basic research as well as the general public, regulators, and industry. To date, studies of e-cigarette emissions have mainly focused on chromatographic techniques for quantifying and comparing the levels of selected e-cigarette aerosol components to those found in traditional cigarettes. E-cigarettes heat and aerosolize the solvents propylene glycol (PG) and glycerol (GLY), thereby affording unique product profiles as compared to traditional cigarettes...
February 14, 2017: Scientific Reports
keyword
keyword
37079
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"