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Author Topic: Science Thread (and !!SCIENCE!! Thread!)  (Read 34904 times)

Naturegirl1999

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #495 on: October 17, 2019, 06:29:46 am »

Slime molds are interesting
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feelotraveller

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #496 on: October 18, 2019, 02:15:06 am »

EDIT: it's also unclear what they mean by "720 sexes". This is a single-celled organism. How do they even define a sex for one of those?

I was just reading about this.  :)  The comment here: https://www.cnet.com/news/paris-zoo-unveils-mysterious-nightmare-slime-dubbed-the-blob/ is

Quote
And if you're hung up on the 720 sexes, well, that's just a fancy way to sell a story.

"They're not really sexes, they are mating types," says Latty. "Whether or not a slime mold can mate with another slime mold depends on its mating type which is determined by particular genes."

(Latty in above quote is "Tanya Latty, a slime mold researcher at the University of Sydney".)

Oh, the possibilities of pr0n in the slime mould world!
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Naturegirl1999

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #497 on: October 18, 2019, 07:27:22 am »

So could sexually reproducing animals and plants be considered to have 2 "mating types?" Or is mating type and sex different?
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wierd

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #498 on: October 18, 2019, 07:36:19 am »

More like what is present in some nematodes, where you have 3 "genders".  Male, Female, and Hermaphrodite.
https://www.sciencealert.com/a-worm-with-three-sexes-and-a-tolerance-for-arsenic-found-thriving-in-a-nearly-lifeless-lake

This gives several "viable" combinations,  Male + female, Female + Hermaphrodite, Male + Hermaphrodite, and Hermaphrodite + Hermaphrodite.

In the case of this slime mold, there are probably biochemically incompatible combinations, which is what gives rise to "mating types"-- For an example in larger species, see also "ring species"
https://en.wikipedia.org/wiki/Ring_species

While there are several types which are mutually exclusive, gene flow can still occur. Because the slime mold is a composite organism of several (potentially genetically distinct) single celled organisms acting in aggregate in complex ways, that gene flow within the assembly is important.
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Naturegirl1999

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #499 on: December 02, 2019, 01:20:52 am »

I found on Wikipedia and I canít find what the L and T stand for in the Stellar Classification article that the image was found in. Did I just miss it?
« Last Edit: December 02, 2019, 01:37:29 am by Naturegirl1999 »
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Il Palazzo

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #500 on: December 02, 2019, 01:55:24 am »

Did I just miss it?
Yes. See 'extended spectral types'. Pt. 5.2.
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Naturegirl1999

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #501 on: December 02, 2019, 02:08:21 am »

Thank you
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wierd

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Egan_BW

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #503 on: December 07, 2019, 03:57:48 am »

Veggies just got tastier.
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wierd

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #504 on: December 12, 2019, 05:48:32 am »

So... Uhm...

Am I mistaken in thinking that this has some... Rather far-reaching implications?
https://phys.org/news/2019-12-energy-space-quantum-weirdness.html

Basically, Casimir effect radiation is capable of transporting thermal energy.


Shouldn't this have some pretty subtle but significant consequences?
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Iduno

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #505 on: December 12, 2019, 09:04:08 am »

So... Uhm...

Am I mistaken in thinking that this has some... Rather far-reaching implications?
https://phys.org/news/2019-12-energy-space-quantum-weirdness.html

Basically, Casimir effect radiation is capable of transporting thermal energy.


Shouldn't this have some pretty subtle but significant consequences?

We've known about radiant heating (the least effective form of heating, and also what we get from the sun) for a while, but maybe.
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Telgin

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #506 on: December 12, 2019, 09:40:10 am »

The article mentions helping with heat dissipation in ICs, but I'm actually not sure how that would work or improve over the current state of the art of just having a big heat sink conducting heat away.  There are probably some applications I'm not thinking of, but it seems to me at least right now this is just a curiosity that may lead to better understanding of quantum mechanics.
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wierd

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #507 on: December 12, 2019, 09:48:56 am »

So... Uhm...

Am I mistaken in thinking that this has some... Rather far-reaching implications?
https://phys.org/news/2019-12-energy-space-quantum-weirdness.html

Basically, Casimir effect radiation is capable of transporting thermal energy.


Shouldn't this have some pretty subtle but significant consequences?

We've known about radiant heating (the least effective form of heating, and also what we get from the sun) for a while, but maybe.



Radiant heating is the transfer of energy via blackbody radiation, which is a completely different mechanism to this one.
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McTraveller

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #508 on: December 12, 2019, 12:55:27 pm »

I don't understand why that article says that the heating from radiation was negligible because the membranes were "far enough" apart.  I feel this is something that got missed in the media version of the article; heat transfer by radiation has no distance limit.

Maybe they meant to say that the heat transfer they observed didn't match the difference-of-temperatures-to-the-fourth-power that would be expected from radiation?
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Il Palazzo

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Re: Science Thread (and !!SCIENCE!! Thread!)
« Reply #509 on: December 12, 2019, 02:35:44 pm »

I don't understand why that article says that the heating from radiation was negligible because the membranes were "far enough" apart.  I feel this is something that got missed in the media version of the article; heat transfer by radiation has no distance limit.

Maybe they meant to say that the heat transfer they observed didn't match the difference-of-temperatures-to-the-fourth-power that would be expected from radiation?
I think it just means that they're far enough for the near-field heat transfer to be negligible or otherwise controllable.
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