• for: polysomnograph, oxygen saturation levels, graph - sleep apnea, sleep apnea - monitoring

• description: sleep apnea oxygen saturation process

  • oxygen saturation cycles through the night with peaks and troughs
  • abdominal movement attempts to draw air in but is obstructed
  • when a threshold of oxygen deprivation occurs, the brain wakes up and awakens the person to remove the obstruction

does this still hold up? the wikipedia lemma points to several more recent sources that seem to offer counter information https://en.wikipedia.org/wiki/Rare_Earth_hypothesis#Free_oxygen_may_be_neither_rare_nor_a_prerequisite_for_multicellular_life The source of the claim seems to be the book itself, so would need to look it up in Ward Brownlee 2000, page 217

Ward in the context of Rare Earth hypothesis says this. An intriguing notion seeing thinking as a form of (deliberate) movement. How is this meant / to be understood? Chemically, in terms of what it requires in an animal (ie us)? The remark is made in the context of the need for oxygen for complex life to be possible. (based on David Catling Univ of Washington) after all. Or environmentally/contextually, as both deliberate physical movement and brain activity are response to outside impulses?

Singh, I., Joseph, P., Heerdt, P. M., Cullinan, M., Lutchmansingh, D. D., Gulati, M., Possick, J. D., Systrom, D. M., & Waxman, A. B. (2022). Persistent Exertional Intolerance After COVID-19: Insights From Invasive Cardiopulmonary Exercise Testing. CHEST, 161(1), 54–63. https://doi.org/10.1016/j.chest.2021.08.010

Jennifer K McDonald. (2021, October 16). Here’s the rebreathed fraction of air table from the all-knowing @DavidElfstrom [Tweet]. @JenniferKShea. https://twitter.com/JenniferKShea/status/1449380211435479047

FACT SHEET: President Biden’s Global COVID-19 Summit: Ending the Pandemic and Building Back Better. (2021, September 22). The White House. https://www.whitehouse.gov/briefing-room/statements-releases/2021/09/22/fact-sheet-president-bidens-global-covid-19-summit-ending-the-pandemic-and-building-back-better/

Summers, C. (2021, June 8). Oxygen shortages are killing thousands. Why aren’t we doing more about this? | Charlotte Summers. The Guardian. http://www.theguardian.com/commentisfree/2021/jun/08/oxygen-shortages-killing-vaccines-drugs

Safi, M. (2021, April 21). India’s shocking surge in Covid cases follows baffling decline. The Guardian. https://www.theguardian.com/world/2021/apr/21/india-shocking-surge-in-covid-cases-follows-baffling-decline

Swenson, A. (2021, April 20). Study lacks evidence on masks, isn’t linked to Stanford. AP NEWS. https://apnews.com/article/fact-checking-629043235973

Gupta, R. K., Marks, M., Samuels, T. H. A., Luintel, A., Rampling, T., Chowdhury, H., Quartagno, M., Nair, A., Lipman, M., Abubakar, I., Smeden, M. van, Wong, W. K., Williams, B., & Noursadeghi, M. (2020). Systematic evaluation and external validation of 22 prognostic models among hospitalised adults with COVID-19: An observational cohort study. MedRxiv, 2020.07.24.20149815. https://doi.org/10.1101/2020.07.24.20149815

Health, C. for D. and R. (2021). Pulse Oximeter Accuracy and Limitations: FDA Safety Communication. FDA. https://www.fda.gov/medical-devices/safety-communications/pulse-oximeter-accuracy-and-limitations-fda-safety-communication

Covid eruption in Brazil’s largest state leaves health workers begging for help. (2021, January 14). The Guardian. http://www.theguardian.com/world/2021/jan/14/brazil-manaus-amazonas-covid-coronavirus

London buses turned into ambulances to ease Covid strain. (2021, January 21). The Guardian. http://www.theguardian.com/world/2021/jan/21/london-buses-turned-into-ambulances-to-ease-covid-strain

Gupta, R. K., Marks, M., Samuels, T. H. A., Luintel, A., Rampling, T., Chowdhury, H., Quartagno, M., Nair, A., Lipman, M., Abubakar, I., Smeden, M. van, Wong, W. K., Williams, B., & Noursadeghi, M. (2020). Systematic evaluation and external validation of 22 prognostic models among hospitalised adults with COVID-19: An observational cohort study. European Respiratory Journal. https://doi.org/10.1183/13993003.03498-2020

How SARS-CoV-2 causes disease and death in covid-19. (n.d.). The Economist. Retrieved June 8, 2020, from https://www.economist.com/briefing/2020/06/06/how-sars-cov-2-causes-disease-and-death-in-covid-19?fsrc=scn/tw/te/bl/ed/thepathsofdestructionhowsarscov2causesdiseaseanddeathincovid19briefing

So this is a limited BOD sensor for only the subset of organic compounds that E. coli can metabolize?