Re: speed and specificity of enzymes

[Jerry Zhu <***>]

Tim,

Sleeping compared with acting can be defined as a
period during which some of body activities are
stopped.  How much stopped? It varies from species to
species. Some birds sleep with one foot standing. Some
bird sleep hang backwards.  So the criteria of
sleeping is not a cozy bed with AC on.  Freezing means
completely frozen inside every single cell with a
temperature of -200F for example.

I would not say the position and velocity measurement
between uni and mult cellular organism, but between
1st order aupoietic and 2nd order autopoietic systems.
 Multcellular organism could be still 1st order since
no nervous system evolved yet.

nematodes survive freezing by dehadration or by
freeze-drying.  I assume that nematodes has a nervous
system. It maybe that at -1C, it dehydrates and
maintains some body activities at a temperature even a
few degrees below 0C. The speed measurement then is
very small but by no means disappeared.  Reduce the
teperature to -25C or -100C, I bet they will be
killed. We can froze a bacteria at any temperature and
speed I assume.

Jerry


--- Tim Gwinn <***> wrote:

> Jerry,
> 
> To add onto my own post, some nematodes survive
> freezing - including
> intracellular freezing:
>
http://jeb.biologists.org/cgi/content/full/206/2/209/-a
> 
> Regards,
> Tim
> 
> > -----Original Message-----
> > From: Tim Gwinn [mailto:***
> > Sent: Thursday, January 20, 2005 2:26 PM
> > To: ***
> > Subject: RE: speed and specificity of enzymes
> >
> >
> > Jerry,
> >
> > What is your criteria for 'freezing' vs.
> 'sleeping'?
> >
> > In my view, the complete cessation of heartbeats
> while frozen is
> > not "sleeping":
> >
>
http://ajpregu.physiology.org/cgi/content/abstract/257/5/R1046?ijk
>
ey=ebd56bc16d4fec2a5cdae03a5d68960eb4151912&keytype2=tf_ipsecsha
> 
> More importantly, the evidence I was asking for was
> about your assertion
> regarding a difference in the significance of
> position and velocity between
> unicellular and multicellular organisms.
> 
> Regards,
> Tim
> 
> > -----Original Message-----
> > From: ROSEN Forum
> [mailto:*** Behalf Of Jerry
> > Zhu
> > Sent: Thursday, January 20, 2005 1:50 PM
> > To: ***
> > Subject: Re: speed and specificity of enzymes
> >
> >
> > Tim,
> >
> > I have disscussed the issues you raised with some
> > biochemist (post doc). We reached concensus that
> there
> > is a difference between sleeping and being frozen.
> >
> > The freeze tolerance animals like wood frogs you
> > mentioned are really sleeping under lower
> temperature
> > than you sleep with. The freeze of cells of a wood
> > frog will kill it if you read the materal
> carefully.
> >
> > Jerry
> >
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com