Hi,
After reading Peat's work i understood that CO2 is not just some waste product but i have some doubts regarding CO2.
1. At what point does the concentration of Co2 in air starts becoming dangerous ?
Quoting from wikipedia - " Occupational CO2 exposure limits have been set in the United States at 0.5% (5000 ppm) for an eight-hour period.[101] At this CO2 concentration, International Space Station crew experienced headaches, lethargy, mental slowness, emotional irritation, and sleep disruption.[102] Studies in animals at 0.5% CO2 have demonstrated kidney calcification and bone loss after eight weeks of exposure.[103] "
" In concentrations up to 1% (10,000 ppm), it will make some people feel drowsy and give the lungs a stuffy feeling.[92] "
2. Why is 5% Co2 is added to oxygen cylinders in hospitals (95% O2 and 5% CO2) ?
3. Quoting from http://grapevine.com.au/~pbierwirth/co2toxicity.pdf - " In humans, carbon dioxide is also known to play a role in oxidative stress caused by reactive oxygen species (ROS) (Ezraty et al. 2011). Ezraty et al (2011) demonstrated that current atmospheric CO2 levels play a role in oxidative stress and that increasing CO2 levels between 400 and 1,000 ppm increasingly exacerbated oxidative stress and damage to DNA in bacteria. Increased CO2 increases the production of ROS" .
I thought CO2 mopped away the ROS and free radicals . So, why are they claiming that increasing CO2 increases ROS.
Hope someone can clarify.
Thanks
After reading Peat's work i understood that CO2 is not just some waste product but i have some doubts regarding CO2.
1. At what point does the concentration of Co2 in air starts becoming dangerous ?
Quoting from wikipedia - " Occupational CO2 exposure limits have been set in the United States at 0.5% (5000 ppm) for an eight-hour period.[101] At this CO2 concentration, International Space Station crew experienced headaches, lethargy, mental slowness, emotional irritation, and sleep disruption.[102] Studies in animals at 0.5% CO2 have demonstrated kidney calcification and bone loss after eight weeks of exposure.[103] "
" In concentrations up to 1% (10,000 ppm), it will make some people feel drowsy and give the lungs a stuffy feeling.[92] "
2. Why is 5% Co2 is added to oxygen cylinders in hospitals (95% O2 and 5% CO2) ?
3. Quoting from http://grapevine.com.au/~pbierwirth/co2toxicity.pdf - " In humans, carbon dioxide is also known to play a role in oxidative stress caused by reactive oxygen species (ROS) (Ezraty et al. 2011). Ezraty et al (2011) demonstrated that current atmospheric CO2 levels play a role in oxidative stress and that increasing CO2 levels between 400 and 1,000 ppm increasingly exacerbated oxidative stress and damage to DNA in bacteria. Increased CO2 increases the production of ROS" .
I thought CO2 mopped away the ROS and free radicals . So, why are they claiming that increasing CO2 increases ROS.
Hope someone can clarify.
Thanks
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