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RE: Teaching bacteria to count - 5/30/2009 1:38:38 AM   
hizgeorgiapeach


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quote:

ORIGINAL: Ialdabaoth
erm.... well, several issues here:

1. Actually, most things intentionally mutate themselves. It's called "sex". It hasn't destroyed the planet yet.
Reproduction - or as you put it "sex" - does not change the DNA sequencing of the organism doing the reproducing.  It simply Duplicates that DNA sequence and seperates it off into a seperate organism.  Or in the case of most animal life, as opposed to single cell life, it takes partial DNA strands from 2 organisms and mixes them to create a 3rd - still not changing the DNA sequencing of either of the two donating organisms.  Mutations are Aberations - things not intended to happen, some good some bad, which inherantly change the DNA structure of the reproduced organism - while still leaving the original in it's original form.  They (mutations) are by their very nature caused by a Malfunction in the genetic code as it is passed along, creating an organism that is Not what it was "supposed" to be had a malfunction not occured.

quote:

2. In order for bacteria to be sentient, it'd have to have a MASSIVE amount of processing - which you could theoretically get with a large enough biofilm, but it would be *slow*. There's just no way something that small can encode sufficient information to "decide" how to mutate in the way you're thinking about - except in a very rudimentary way, which many organisms do already.
  Do we Know this, or is it simply an assumption based upon our inability to measure /comprehend other life forms unless we anthropomorphise them?  We - as a species - tend to make the rather arrogant assumption that because we do not understand the thought processes of other forms of life, it must therefore not exist.  Personally, I think it's a faulty assumption, and one which will take it's toll eventually.

quote:

3. Anything we can do, Mother Nature can do better. Infectious organisms have been trying to get around immune systems for billions of years now, and immune systems have been trying to outsmart them the whole time. In fact, the tactics both sides use are a form of deliberate mutation. The genes in your DNA that govern antibody production, for example, deliberately shuffle and mutate your genetic code all the time, to produce the widest possible spectrum of different antibody shapes. This ensures that SOMETHING will catch a foreign invader. It's highly unlikely that we could find a better combination to defeat this process than 3 billion years' worth of evolution has come up with, without a MUCH better understanding of the specifics of protein interaction than we have today. Maybe by 2020, but by then I hope to be immortal and made of titanium and carbon nanotubes.
   Yes, and various infectious organisms have been Suceeding in Killing our life form for billlions of years now, on a fairly regular basis, despite the best efforts of our immune systems and even despite the best efforts of modern technology and it's attendant anti-virals, anti-bacterials, and anti-fungals.  Can we say "Bubonic Plague"?  I knew we could.  How about "Pnumonic Plague"?  Or perhaps something a lil closer to home due to it being more modern - the various Hemophagic Fevers that have come out of the African interior in modern times.... oh yeah, and the ever popular Retro-virus of HIV?  Even with our BEST drugs, infection via a multitude of bacterial, viral, and fungal agents still occures on a regular basis - sometimes medicine can knock it back, other times it can't - and one of the things we have to Thank for modern medicine's partial sucess is Already mutated bacteria that are drug resistant and can barely be killed.  (Think Flesh eatting Stapholococcus, and MSRV.)

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RE: Teaching bacteria to count - 5/30/2009 6:42:01 AM   
MsFlutter


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quote:

ORIGINAL: PyrotheClown

I think they already are, the article mentioned that these were engineered bacteria.
I don't know how you would go about engineering bacteria like that with out the assistance of nanotechnology.


I freely admit I dont have a degree in the sciences. Any glaring faux pas on my part is an innocent one  :)

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RE: Teaching bacteria to count - 5/30/2009 9:01:47 AM   
DomKen


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quote:

ORIGINAL: Ialdabaoth


quote:

ORIGINAL: DomKen
That is essentially correct. However since the signal chemicals specific bacteria detect are only emitted by close relatives the function is that if the bacteria in question is in the middle of a lot of similiar bacteria it does X and if it is in a less dense concentration or is surrounded by unrelated bacteria it does Y.

The usual example is a variety of bioluminescent bacteria, vibrio fischeri. In its planktonic lifestyle it is at a very low concentration and there isn't enough of the signaling chemical released to trigger luminescence. However it also occurs as a symbiote growing in the photophore of the Hawaiin bobtail squid. In that situation the signal chemical is found in very high concentration inside the photophore and the bacteria glow.


Hrm. So does it cease to be called 'quorum sensing' when it involves more complex processes, then? Like, for example, the Hox genes in multi-cellular organisms.

I've only seen quorum sensing when talking about bacteria and social insects never about embryo development. Hox gene regulation is a substantially more involved process but I'm unsure if there is any evidence of an evolutionary relationship between the indicator molecules used in quorum sensing and things like hox gene activation. I do know an eve-devo researcher and I'll send him a question about it.

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RE: Teaching bacteria to count - 5/30/2009 3:30:57 PM   
BrokenSaint


Posts: 301
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I for one welcome our new bacterial overlords.

Sure it could eventually be dangerous, but many things that are exciting are.

Also, the lecture really doesn't start to get interesting until quite a bit past the 5min mark. He stalls a bit on the submarine business. It's like yes. They both have alot. Yes the whale is more complex. Move on to the meat of the lecture dude.


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RE: Teaching bacteria to count - 5/30/2009 7:16:28 PM   
atropa7


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Uh, it's quite easy to genetically engineer bacteria using just enzymes, pre-fab genes from a PCR cycle, and micropipettes. It's called biochemistry. I do it whenever possible. No extra-fancy nanotechnology required.

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RE: Teaching bacteria to count - 5/30/2009 7:28:24 PM   
numuncular


Posts: 183
Joined: 2/14/2009
Status: offline
quote:

ORIGINAL: hizgeorgiapeach

quote:

ORIGINAL: Ialdabaoth
erm.... well, several issues here:

1. Actually, most things intentionally mutate themselves. It's called "sex". It hasn't destroyed the planet yet.
Reproduction - or as you put it "sex" - does not change the DNA sequencing of the organism doing the reproducing.  It simply Duplicates that DNA sequence and seperates it off into a seperate organism.  Or in the case of most animal life, as opposed to single cell life, it takes partial DNA strands from 2 organisms and mixes them to create a 3rd - still not changing the DNA sequencing of either of the two donating organisms.  Mutations are Aberations - things not intended to happen, some good some bad, which inherantly change the DNA structure of the reproduced organism - while still leaving the original in it's original form.  They (mutations) are by their very nature caused by a Malfunction in the genetic code as it is passed along, creating an organism that is Not what it was "supposed" to be had a malfunction not occured.



it can and it does quite routinely through chromosomal crossover during meiosis

(in reply to hizgeorgiapeach)
Profile   Post #: 26
RE: Teaching bacteria to count - 5/31/2009 2:55:34 AM   
Ialdabaoth


Posts: 1073
Joined: 5/4/2008
From: Tempe, AZ
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quote:

ORIGINAL: DomKen

I've only seen quorum sensing when talking about bacteria and social insects never about embryo development. Hox gene regulation is a substantially more involved process but I'm unsure if there is any evidence of an evolutionary relationship between the indicator molecules used in quorum sensing and things like hox gene activation. I do know an eve-devo researcher and I'll send him a question about it.


Thank you! You rock.

(in reply to DomKen)
Profile   Post #: 27
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