--- Log opened Sat Nov 05 00:00:08 2022
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07:36 < L29Ah> works good until PLA is moisture-embrittled, then it breaks
10:30 < muurkha> does moisture also cause PLA to change its dimensions?  I've noticed that acetone and ethyl acetate swell it substantially (as well as making it soft and floppy)
10:30 < muurkha> for more normal materials the usual worry is thermal expansion, and PLA is surprisingly good at thermal expansion for an organic polymer
10:31 < muurkha> but creep is a huge problem
10:31 < muurkha> I'd never thought about mositure before though
10:41 < L29Ah> muurkha: it doesn't change the dimensions much as it's not dissolving PLA
10:41 < docl> they're just using it for the racks, not the vials, right?
10:41 < L29Ah> yes
10:41 < L29Ah> vapors and spills from the vials could be troublesome tho
10:46 < muurkha> it would be nice to find something that dissolved PLA
10:47 < L29Ah> just switch to ABS like virtually all the electronics industry did
10:48 < muurkha> heh, I was going to say, switching to ABS is the standard advice
10:48 < muurkha> but ABS has a much worse thermal coefficient of expansion, and is not foodsafe, so it's not a perfect substitute in all cases
10:49 < L29Ah> i doubt any FDM-printed plastic is truly food-safe, except maybe PCL
10:50 < muurkha> really?  what's the food-safety issue with PLA?
10:50 < L29Ah> PLA is probably as safe as burnt food that isn't safe
10:50  * L29Ah senses the smell of burned sugar when PLA is heated to the printing temperature
10:51 < muurkha> yeah, me too
10:51 < L29Ah> tho if you consider eating traditional bread/pizza safe, then probably printed PLA is 
10:51 < muurkha> but not only is caramel coloring considered food-safe, there normally isn't enough of it in the PLA to give it a visible color, even for white PLA
10:52 < L29Ah> polystyrene is considered food safe for packaging and single-use dishes, even though i smell styrene, esp when it's heated
10:53 < L29Ah> or mechanically crushed
10:54 < muurkha> yeah but caramel coloring is GRAS in large enough quantities to turn your food black
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17:30 < kanzure> "Physics-based modeling of whole-cell function: colloidal fundamentals to life-essential processes" https://ui.adsabs.harvard.edu/abs/2021APS..MARM12011Z/abstract
17:34 < kanzure> their subdomain seems to be a misnomer https://secure.jcvi.org/site/
17:36 < kanzure> "In April 2022 Venter sold the La Jolla JCVI facility to the University of California, San Diego for $25 million. The university, which already has a very strong genomics program, hopes to absorb most of the Institute's faculty and its current research grants. Venter will continue to lead a separate nonprofit research group, also known as the J. Craig Venter Institute, and stressed that he is ...
17:36 < kanzure> ...not retiring.[12]"
17:42 < kanzure> "Fundamental behaviors emerge from simulations of a living minimal cell" https://www.sciencedirect.com/science/article/pii/S0092867421014884 (from JCVI)
17:46 < kanzure> what exactly is venter doing with this guy https://www.jcvi.org/about/rudy-ruggles-jr
17:54 < fenn> probably dinking about in submarines near hydrothermal ridges
17:56 < fenn> "The Global Ocean Sampling Expedition (GOS) is an ocean exploration genome project with the goal of assessing the genetic diversity in marine microbial communities and to understand their role in nature's fundamental processes. Begun as a Sargasso Sea pilot sampling project in August 2003"
18:01 < fenn> ruggles "Descended 8,500’ to mid-Atlantic Ridge off Azores in Russian MIR-2 manned deep submersible to study biodiversity of hydrothermal vent fields"
18:12 < lsneff> I have a bet with my manager that starlink sats won’t run on rust within 5 years
18:16 < L29Ah> what instrument do you plan to use to determine whether starlink sats run on rust?
18:18 < L29Ah> s,instrument,procedure,
18:57 < muurkha> I think lsneff just started working at SpaceX, so they might be able to just ask someone on the starlink team
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20:28 < lsneff> that would be it
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--- Log closed Sun Nov 06 00:00:09 2022