CryoNet #33057

CryoNet - Sun 14 Nov 2010

    #33057: Drac's Back [Electro Boy]

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Message #33057
Date: Sat, 13 Nov 2010 10:20:42 -0800 (PST)
From: Electro Boy <[email protected]>
Subject: Drac's Back

--0-593584689-1289672442=:5379

http://www.youtube.com/watch?v=ApoF7M2Hj3M


I wanna suck your blood.....

--- On Sat, 11/13/10, CryoNet <[email protected]> wrote:

From: CryoNet <[email protected]>
Subject: CryoNet #33055 - #33056
To: [email protected]
Date: Saturday, November 13, 2010, 10:00 AM

CryoNet - Sat 13 Nov 2010

    #33055: Holes [Perry E. Metzger]
    #33056: Re: CryoNet #33053 - #33054 [Gerald Monroe]

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Message #33055
Date: Fri, 12 Nov 2010 09:02:50 -0500
From: "Perry E. Metzger" <[email protected]>
Subject: Holes
References: <[email protected]>

> From: "Chris Manning" <[email protected]>
> 
> [snip]
> 
> >> How can the robots even get into a cell without tearing a hole?  
> >
> > You clearly can't enter a cell without producing a hole in it --
> > cell membranes are not Klein bottles, so getting from the outside
> > to the inside requires a hole. The question is how you make a
> > hole that is either easily repaired or which self-seals. Again,
> > this has been considered before, in great detail. Freitas'
> > "Nanomedicine" is quite comprehensive.
> 
> Nature must have solved this problem already, as water and
> nutrients pass into cells and wastes are removed. So - how does
> Nature do it? Can we imitate Nature, or even improve on it?

Small molecules travel directly across the membrane through small
pores in it. Some substances are actively transferred across the
membrane by mechanisms embedded in it, some travel purely via osmotic
pressure.

None of these mechanisms will work for objects comparable in size to
organelles or the cell itself. On the other hand, natural systems
penetrate the membrane without permanently damaging it quite routinely
-- for example, viruses do this.

These are very easy to answer questions, easily answered by reading
basic biology textbooks.

In any case, I doubt that we will be imitating any of these mechanisms
in detail. They're all inappropriate.


Perry
-- 
Perry E. Metzger        [email protected]

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Message #33056
References: <[email protected]>
From: Gerald Monroe <[email protected]>
Date: Sat, 13 Nov 2010 00:10:08 -0600
Subject: Re: CryoNet #33053 - #33054

--001485f9a53e56abb50494e910dd

Chris : nature tears holes.  Also, at room temperature, the lipid membranes
of a cell are self healing and will spontaneously reform if a hole is
punctured.  But at cryogenic temperatures, everything is a solid rock.
 That's the reason why I keep asking how an independent robot around the
scale of a virus or small bacterium could possibly repair the brain at those
temperatures.  (versus an integrated machine that internally operates at
higher temperatures and is supplied with external power and cooling by the
kilowatt)

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