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  #1626  
Old 06-30-2019, 08:43 PM
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Default Re: A Question For The Lone Ranger

Deciding what is and is not alive is, of course, a thorny issue indeed.


Still, prions have no metabolism; strictly speaking, they do not reproduce; they have no genetic material of any sort; they are not cellular -- by pretty-much every criterion, they don't fit the description of what we've agreed to call "alive."

Some people describe prions and other such things that occupy the boundary between what's clearly living and what's clearly non-living as "proto-life."
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  #1627  
Old 07-01-2019, 07:47 AM
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Default Re: A Question For The Lone Ranger

I like prions for my cutoff for non life.

I arbitrarily let genetic information and replication be my criteria.

Viruses are thus alive.

Prions are not alive.

I think while prions can be considered life like, they don’t make copies, they bump into and change confirmations. I think it is as to
Reproduction as conjugation is to biological sex.
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  #1628  
Old 07-01-2019, 08:18 PM
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Default Re: A Question For The Lone Ranger

Last night I couldn’t sleep.
Oow I know, I don’t know much about Prions, lets wander the wikipedia hyperlinks about them for a bit. Wikipedia, ‘did you know there’s an extremely rare, possibly genetic and untested for prion disease called Fatal Familial Insomnia where the disease robs the person of the ability to get a full night sleep until the last few months of their lives they end up with severe hallucinatory dementia before dying, maybe of the prion disease, maybe from the degradation of no sleep, eitherway it’s always fatal.’

Thanks FF and Wikipedia, thanks a lot!


Related I did notice that I’ve been using Prion to mean a miss folded protein but on reading noticed PrP stands for Prion Protein and Prion is the specific protein that’s being missfolded. Which leads to the question, are there other Proteins that missfold like this or are PrPs just extremely susceptible to it?
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  #1629  
Old 10-07-2019, 04:49 AM
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Default Re: A Question For The Lone Ranger

Not a question. One of your various image uploads just prompted me to read about statocysts.
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  #1630  
Old 10-08-2019, 10:56 PM
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Default Re: A Question For The Lone Ranger

What kind of spider is this that was on the hood of my car while I was driving? I thought it was a bee just because it was fuzzy until I looked closer. I can't recall seeing a spider like this around here (in the Triangle, NC) before.

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  #1631  
Old 10-09-2019, 01:14 AM
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Default Re: A Question For The Lone Ranger

Where I come from (far from your big city Triangle lights, obvsly) we'd call that a jumping spider but I can't rightly say what name the evolutionists would call it by.
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  #1632  
Old 10-09-2019, 01:37 AM
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Default Re: A Question For The Lone Ranger

That is indeed a Jumping Spider, specifically it's the Canopy Jumping Spider, Phidippus otiosus.

Spiders are members of the order Araneae in the class Arachnida, and Jumping Spiders are the members of the family Salticidae. As you can see from the picture, members of the Salticidae typically have one pair of large, forward-facing eyes which give them excellent vision and the ability to judge depth well. (Spiders have either 6 or 8 eyes, typically; in the Salticidae, the remaining eyes are generally much smaller than the 2 large, forward-facing eyes.)

Unlike most spiders, which use webs to capture prey, Jumping Spiders creep up close to their victims, then leap to grab and subdue their prey.


Phidippus otiosus is actually fairly common in the southeastern U.S., but it's pretty small and typically lives in trees. So, even though it's fairly common, it isn't encountered all that often.


As an aside, though it's hard to tell in the picture above, because the spider's pedipalps are blocking the view of its chelicerae, Salticids typically have quite large fangs. This allows them to inject relatively large amounts of venom to quickly subdue prey -- an important thing for a spider that doesn't web up its victims to subdue them.
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  #1633  
Old 10-09-2019, 04:30 PM
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Default Re: A Question For The Lone Ranger

Quote:
pedipalps are blocking the view of its chelicerae
I hate it when that happens. :sadno:
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  #1634  
Old 10-09-2019, 04:50 PM
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Default Re: A Question For The Lone Ranger

IT'S SO FLUFFY I'M GONNA DIE.

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  #1635  
Old 10-09-2019, 06:13 PM
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Default Re: A Question For The Lone Ranger

Quote:
Originally Posted by Crumb View Post
Quote:
pedipalps are blocking the view of its chelicerae
I hate it when that happens. :sadno:
full frontal chelicerae or gtfo
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  #1636  
Old 10-10-2019, 12:05 AM
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Default Re: A Question For The Lone Ranger

My dad was amused by this, so he asked on FB, and their best guess was a zebra spider, but I knew it wasn't fuzzy looking enough. And it doesn't have the white area on the face.

I thought it was cute. Don't be fooled by the picture's lack of scale, it's less than an inch long, not tarantula size haha
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  #1637  
Old 10-11-2019, 07:42 PM
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Default Re: A Question For The Lone Ranger

Quote:
Originally Posted by erimir View Post
Why do prion diseases seem to only affect the brain?

I'm aware that they can accumulate in other tissue, but it seems that prion diseases are really only a problem if they get in the brain.
Adding to what TLR mentioned, the brain is especially vulnerable to prions. Anywhere else, a cell that starts acting weird gets killed, digested, and replaced without fanfare, but brain cells aren't disposable. They replace themselves very slowly and live about as long as you do. Which is why the brain is protected by the blood-brain barrier. But this filter isn't fine enough to catch prions.
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