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Mailing List Logs for ShadowRN

Message no. 1
From: Erik_Jameson@*****.COM
Subject: RE> Re: Underwater bre
Date: Tue, 3 Dec 1996 10:44:27 -0800
RE> Re: Underwater breathing
To Net Enhancements for Roleplaying Shadowrun<NERPS@********.itribe.net>


Let's not forget the problems with nitrogen poisoning (which
was a prime impetus for divers trying different mixtures in
their tanks). They still haven't found a way around it,
regardless of the mixture. At sufficient depths, the
nitrogen we retain in our bodies "comes out" and becomes
gaseous in the blood. So there are still problems with
nitrogen bubble embolisms and with the detrimental affects
of the bends.

Just another wrench in the works.

Erik
Message no. 2
From: Glenn Robertson <Glenn.Robertson@***.EDU>
Subject: Re: RE> Re: Underwater bre
Date: Tue, 3 Dec 1996 13:46:08 -0700
> Let's not forget the problems with nitrogen poisoning (which
> was a prime impetus for divers trying different mixtures in
> their tanks). They still haven't found a way around it,
> regardless of the mixture. At sufficient depths, the
> nitrogen we retain in our bodies "comes out" and becomes
> gaseous in the blood. So there are still problems with
> nitrogen bubble embolisms and with the detrimental affects
> of the bends.

I believe (and could be wrong) that the problem is that the nitrogen
can't come out of the blood again when you surface to quickly, and
therefore forms actual bubbles causing nitrogen emboli. But yes, you are
correct that the nitrogen does dissolve into the blood at that pressure.
I had forgotten about that. But, being in the blood isn't the problem,
it is coming back out that is. If you have a slow ascent, it comes out
fine. It is if you come up too quickly that it causes problems. That is
why decompression chambers are used, to slowly simulate ascent and allow
the nitrogen to escape.

Glenn
Message no. 3
From: Calvin Hsieh <u2172778@*******.ACSU.UNSW.EDU.AU>
Subject: Re: RE> Re: Underwater bre
Date: Wed, 4 Dec 1996 09:52:44 +1100
On Tue, 3 Dec 1996 Erik_Jameson@*****.COM wrote:

> RE> Re: Underwater breathing
> To Net Enhancements for Roleplaying Shadowrun<NERPS@********.itribe.net>
>
>
> Let's not forget the problems with nitrogen poisoning (which
> was a prime impetus for divers trying different mixtures in
> their tanks). They still haven't found a way around it,
> regardless of the mixture. At sufficient depths, the
> nitrogen we retain in our bodies "comes out" and becomes
> gaseous in the blood. So there are still problems with
> nitrogen bubble embolisms and with the detrimental affects
> of the bends.
>
I thought I had already mentioned this. This is one of the main reasons
why a helium mix is used instead. Helium does not dissolve well in blood
compared to nitrogen. Hence, with helium mixes, the problem of the bends
is not as significant.

Shaman

> Just another wrench in the works.
>
> Erik
>

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