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Cake day: July 4th, 2023

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  • deranger@sh.itjust.workstoScience Memes@mander.xyzCone snails
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    22 hours ago

    The cone snail referenced in the study you linked, Conus geographus, also has the same ion channel disrupting venom that is typical of cone snails. If you were bit by one, you’d die of paralysis. It does appear to use an insulin-like peptide to initially stun the fish, but the coup de grâce is from typical paralytic conotoxins.

    A cool discovery nonetheless and TIL. Neat.

    https://pubmed.ncbi.nlm.nih.gov/25301479/

    Conus geographus is the most dangerous cone snail species known, with reported human fatality rates as high as 65%. Crude venom gland extracts have been used to determine animal LD50 and to aid the isolation of several potent paralytic toxins. […]The molecular composition of individual defense-evoked venom showed significant intraspecific variations, but a core of paralytic conotoxins including α-GI, α-GII, μ-GIIIA, ω-GVIA and ω-GVIIA was always present in large amounts, consistent with the symptomology and high fatality rate in humans.



  • deranger@sh.itjust.workstoScience Memes@mander.xyzCone snails
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    1 day ago

    I’m a former biochemist and my university studied conotoxins for use as analgesics. Cone snail venom as commonly understood are ion channel blockers. I’ve not heard of what you’re mentioning until now, but when you mention “cone snail venom”, most biology people are thinking of ion channel blockers. This is their primary method of disabling prey.

    If you’re bit by a cone snail and try to drink some soda to counteract the toxin, you’re going to have a bad time. They’re called cigarette snails because you’ve got time to smoke one cig before you die - and not from low blood sugar.

    From your source:

    For example, fish-hunting cone snails use a “motor cabal” to disrupt the propagation of action potentials at the neuromuscular junction. Motor cabal toxins include those that block presynaptic voltage-gated calcium channels (CaV), postsynaptic nicotinic acetylcholine receptors (nAChR), and voltage-gated sodium channels (NaV) on muscle cells6.

    From Wikipedia:

    https://en.wikipedia.org/wiki/Conotoxin

    As of 2005, five biologically active conotoxins have been identified. Each of the five conotoxins attacks a different target:












  • This costs “less than $70”.

    You can get a cheap Geiger counter for $50 today and it’s about the same size. I see some for $30-40. These are based on old, proven technology, not some new thing with new unknown problems and an app.

    Not that it isn’t neat, but it’s kind of a solved problem.

    To put this into perspective, a 10 Gray dose to the skin is high enough to cause permanent hair loss.

    A 10Gy exposure is well, well beyond hair loss range and into the fatal within days zone. The LD50 is 5Gy, LD99 is 9Gy IIRC. Methinks the author did not do their research on the topic.


  • None of the above, well maybe the last one. Plexamp has algorithmically generated playlists based off song/album/artist, decades, genres, top rated tracks, etc. including auto mixing with crossfading, and ability to choose tracks not only from your own libraries, but from all libraries shared with you.

    This feature has done wonders for library discovery as I have an absolutely massive music stash. It’s completely replaced music discovery via streaming apps for me.

    I really do appreciate all the efforts to inform me of JF features but I am quite happy with my setup currently, and I don’t want to reconfigure all my shit AND get 12 n users to switch apps. It was hard enough as it is.