Airborne particulate matter has become an important topic of epidemiological and environmental studies in the last decade when it was understood that the particulate matter is an important determinant of deaths, especially in the elderly, even though the biological mechanisms of its effect are not quite clear yet. The United States Environmental Protection Agency regulates the admissible levels...

ABSTRACT: In this study the non-saponifiable matter of oils extracted from nine varieties of sunflower seed were subjected a series of chemical tests. The non-saponifiable matters were fractionated into a number of chemical classes of compounds namely sterols, 4 methyl sterols, triterpene alcohols, tocopherols and hydrocarbons. The two major and important classes of compounds consisting of ster...

Particulate matter contamination is known to become wet and therefore ionically conductive and corrosive if the humidity in the environment rises above the deliquescence relative humidity (DRH) of the particulate matter. In wet condition, particulate matter can electrically bridge closely spaced features on printed circuit boards (PCBs), leading to their electrical failure. Failures attributed ...

Organic matter dynamics were studied in five streams at Coweeta Hydrologic Laboratory. Three of these streams drained logged watersheds, and two drained reference deciduous forest watersheds. Litter inputs to the streams draining disturbed watersheds were significantly lower than to reference streams. Additionally, while undisturbed litterfall consisted primarily of relatively refractory leaf s...

We propose a direct method of partitioning the particulate spectral scattering coefficient of the marine hydrosol based on the concurrent determination of the concentrations of particulate mineral and organic matter (the total mass of optically active scattering material exclusive of water) with the particulate spectral scattering coefficient. For this we derive a Model II multiple linear regre...

Sinking particulate organic matter controls the flux of carbon (C) from surface ocean to deep sea. Microorganisms actively colonize particles, but extent which microbial metabolism influences particle export remains uncertain. We conducted experiments quantify rates bacterial production (derived based on 3H-leucine incorporation) and dark C-fixation (based 14C-bicarbonate assimilation) associat...

This study aims to assess the effects air pollution on hospitalization due to hypertension. An ecological study was conducted using data regarding hospitalizations due to hypertension in São José dos Campos, State of São Paulo, Brazil between January 1, 2007 and December 31, 2010. The pollutants analyzed by this study were particulate matter, sulfur dioxide and ozone. A significant association ...

1 Environmental Toxicology Laboratory, Instituto Nacional de Canceroloǵıa, Avenida San Fernando 22, Tlalpan, 14080 México City, CP, DF, Mexico 2 Centre for Environmental Sciences, Hasselt University, 3500 Hasselt, Belgium 3Department of Public Health, Leuven University (KU Leuven), 3000 Leuven, Belgium 4Department of Physiology, College of Medicine and Health Sciences, United Arab Emirates Univ...

speciated samples of pm2.5 were collected at the hamshire and orange sites in golden triangle of texas by us epa (environmental protection agency) from july of 2003 to august of 2005. a total of 269 samples for the hamshire site and 293 samples for the orange site with 52 species were measured; however, 22 species were excluded because of too many below-detectionlimit data. among the 22 species...