some models suggest the earth will undergo unavoidable and irreversible runaway global warming due to heating oceans sending water vapor into the atmosphere in as little as 2-300 million years. so most photosynthetic organisms may have already died before that run out of capability to sustain C3 fixation.

(December 18, 2023 at 1:41 pm)Anomalocaris Wrote: some models suggest the earth will undergo unavoidable and irreversible runaway global warming due to heating oceans sending water vapor into the atmosphere in as little as 2-300 million years.  so most photosynthetic organisms may have already died before that run out of capability to sustain C3 fixation.

That’s intriguing. Global warming doesn't seem like something models would be interested in, let alone make suggestions about. Generally, they’re more focused on bulemia and dating athletes.

Boru

The Bail (oldest grandchild) made the Dean's List for her first semester in college!

(December 18, 2023 at 5:54 pm)BrianSoddingBoru4 Wrote:

(December 18, 2023 at 1:41 pm)Anomalocaris Wrote: some models suggest the earth will undergo unavoidable and irreversible runaway global warming due to heating oceans sending water vapor into the atmosphere in as little as 2-300 million years.  so most photosynthetic organisms may have already died before that run out of capability to sustain C3 fixation.

That’s intriguing. Global warming doesn't seem like something models would be interested in, let alone make suggestions about. Generally, they’re more focused on bulemia and dating athletes.

Boru

It’s the reclusive, high IQ parts of the modeldom.

(December 18, 2023 at 1:34 pm)Foxaèr Wrote: Chocolate covered brussel sprouts.

Sicko!!

The underlying molecular mechanism that allow ionizing radiation exposure to inflict damage, and cause acute radiation sickness, is essentially the same as the molecular mechanism that causes damage to cells during oxygen respiration.  

for an average person, breathing over a lifetime does approximately 15,000 times as much damage as a chest, x-ray, or 50 times as much damage as all the ionizing radiation at typical person is exposed to over lifetime

in fact, if we are exposed to oxygen concentration, several times higher than normal atmosphere we suffer from acute oxygen poisoning. And the fundamental cause at the mechanism of acute oxygen poisoning, is very similar to radiation sickness.

^I'll expect to see cites for this.

I admit the claims were a bit disingenuous.  Ionizing radiation and oxygen respiration both do damage by producing superoxides and hydroxyls in the cells.    Oxygen respiration over a life time produces about 15000 times as much hydroxyls as a single chest x-ray, or 50 times as much as produced by all the ironizing radiation typically esperienced during a life time.

The disingenuousness comes from ignoring two factors to imply a more general equivalence. 

1.   Cells have evolved repair mechanisms against damages caused by superoxides and hydroxyls.   The mechanism is able to more or less keep pace with the damages caused by normal respiration.    However acute radiation exposure produces much more hydroxyls in small amount of time than respiration in normal atmosphere, so it overwhelms the repair mechanisms.    The repair mechanisms can also be overwhelmed when breathing air with too much oxygen,  this is the underlying reason for oxygen toxicity.

2.  The Superoxides and hydroxyls produced by respiration occur primarily in cellular organelles involved, namely mitochondria.   Hydroxyls and superoxides produced by radiation exposure occurs throughout the cell.   So damage repair mechanisms operates more efficiently against damages produced by respiration than those by ionizing radiation.

Apparently, there was at least one point where Donald Trump actually kept a book of Hitler’s Speeches by his bedside.

https://www.vanityfair.com/magazine/2015...ie-brenner

You know that tingly, slightly sore sensation you feel in your mouth when you eat pineapple? It's cause by an enzyme called 'bromelain', which breaks down proteins and is widely used as a meat tenderizer.

So, in a small - even miniscule - way, the pineapple is trying to digest you.

Boru