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rrock

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What's happening inside the NIH and NSF

science.org
957 points·by rrock·w zeszłym roku·1,536 comments

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rrock
·2 lata temu·discuss
Surprising that anyone still thinks the Penrose model could work. Microtubules do not exhibit harmonic motion like violin strings. The reason is that all motion at the length scale of cells or smaller is heavily overdamped.

The environment within a cell is nonintuitive. To find out more about this, read “Life at low Reynolds number” or “Mechanics of Motor Proteins and the Cytoskeleton” by Joe Howard.
rrock
·3 lata temu·discuss
Lossy compression is a bad idea for scientific images. For instance, we often need to understand the statistics of photon detection events in background regions. That’s one of the first things to get tossed.
rrock
·3 lata temu·discuss
It wasn’t entirely clear in the parts that I watched, but my understanding is that slime molds are actually “social” amoeba. They often crawl around as loners, eating whatever they can find. But if they run out of food, they start sending out chemoattractants to all of their buddies in the neighborhood. They all crawl together and create a fruiting body (a spore) that eventually will break off in the wind and land somewhere else. Hopefully, in greener pastures. Those fruiting bodies are what you see in these videos. Amazing creatures, they live on the brink of multicellular eukaryotes.
rrock
·3 lata temu·discuss
3% CO2 from mask wearing? I doubt it. I recently needed to measure 5% CO2, and I had to hold my breath to near-passout levels to reach 5% on the monitor. There’s no way that I could tolerate 3% for any length of time.

More likely these authors cherry-picked studies with typos in them.
rrock
·3 lata temu·discuss
Bit flips from cosmic rays. Earth’s magnetic field helps to shield us, but is disrupted now. I work with a CCD camera in a sub basement lab. On a normal day we see a stray cosmic ray every couple of minutes (as a hot pixel). On a day like today, might be every couple of seconds.