Safe human exposure limits for airborne linear siloxanes during spaceflight

Safe human exposure limits for airborne linear siloxanes during spaceflight

BACKGROUND Low molecular weight siloxanes are used in industrial processes and consumer products, and their vapors have been detected in the atmospheres of the Space Shuttle and International Space Station. Therefore, the National Aeronautics and Space Administration (NASA) developed spacecraft maximum allowable concentrations (SMACs) for siloxane vapors to protect astronaut health. Since publi...

Direct Human Contact with Siloxanes (Silicones) – Safety or Risk Part 1. Characteristics of Siloxanes (Silicones)

Siloxanes are commonly known as silicones. They belong to the organosilicon compounds and are exclusively obtained by synthesis. Their chemical structure determines a range of physicochemical properties which were recognized as unique. Due to the susceptibility to chemical modifications, ability to create short, long or complex polymer particles, siloxanes found an application in many areas of ...

Marijuana Exposure During Lactation: Is It Safe?

Cannabis is the most commonly used illicit drug in Canada. The true prevalence during pregnancy remains unknown. Based on data from the Canadian Alcohol and Drug Use Monitoring Survey (CADMUS), 6.2% of women reported past year use of cannabis (Health Canada 2012). Results from the 2010 National Survey on Drug Use and Health (NSDUH) also estimated the rate of illicit drug use by pregnant women i...

Human dose response relation for airborne exposure to Coxiella burnetii

BACKGROUND The recent outbreak of Q fever in the Netherlands between 2007 and 2009 is the largest recorded Q fever outbreak. Exposure to Coxiella burnetii may cause Q fever but the size of the population exposed during the outbreak remained uncertain as little is known of the infectivity of this pathogen. The quantification of the infectiousness and the corresponding response is necessary for a...

Safe drinking limits?