I have been in the hospital for almost three weeks due to bleeding from
warfarin. I had to have three blood transfusions and an operation. I am
only now getting my strength back. Some of my comments, therefore, may
be dated.
"Physical" has a variety of overlapping meanings (a Wittgensteinian
family resemblence). For example Quine takes the physical to be anything
accessible to the senses or inferences therefrom. Ladyman, Ross, Collier
an Spurrett take the physical to be the most fundamental laws of our
(part of) the universe. I did not agree with this, among some other
crucial points, so I was not a primary author. Information is at least
physical in both of these senses. Quine's approach might make it
entirely physical. I prefer to relate it to the causal, which always has
physical parametres, as far as we know. But there are many ways of
approaching this issue, and disentangling them will be a major advance
in foundations of information theory.
My Best,

Professor John Collier  
Philosophy, University of KwaZulu-Natal
Durban 4041 South Africa
T: +27 (31) 260 3248 / 260 2292
F: +27 (31) 260 3031
email:>>> On 2012/03/16 at 01:19 PM, in message
<>, "Pedro C. Marijuan"
<> wrote:

Dear discussants,

I tend to disagree with the motto "information is physical" if taken
too strictly. Obviously if we look "downwards" it is OK, but in the
"upward" direction it is different. Info is not only physical then, and
the dimension of self-construction along the realization of life cycle
has to be entered. Then the signal, the info, has "content" and
"meaning". Otherwise if we insist only in the physical downward
dimension we have just conventional computing/ info processing. My
opinion is that the notion of absence is crucial for advancing in the
upward, but useless in the downward. 
By the way, I already wrote about info and the absence theme in a 1994
or 1995 paper in BioSystems...


---Pedro escribió: 

Thanks John and Kevin to update issues in information, computation,
energy and reality.
 I would like point out to other articles more focused in how coherence
and entanglement are used by living systems (far from thermal
Engel G.S., Calhoun T.R., Read E.L., Ahn T.K., Mancal T., Cheng Y.C.,
Blankenship R.E., Fleming G.R. (2007) Evidence for wavelike energy
transfer through quantum coherence in photosynthetic systems. Nature,
446(7137): 782-786.
Collini E., Scholes G. (2009) Coherent intrachain energy in migration
in a conjugated polymer at room temperature.  Science, vol. 323 No. 5912
pp. 369-373.
Gauger E.M., Rieper E., Morton J.J.L., Benjamin S.C., Vedral V. (2011)
Sustained Quantum Coherence and Entanglement in the Avian Compass. Phys.
Rev. Lett., 106: 040503.
Cia, J. et al, (2009)  Dynamic entanglement in oscillating molecules. 
arXiv:0809.4906v1 [quant-ph]
fis mailing
Pedro C. Marijuán
Grupo de Bioinformación / Bioinformation Group
Instituto Aragonés de Ciencias de la Salud
Avda. Gómez Laguna, 25, Pl. 11*
50009 Zaragoza, Spain
Telf: 34 976 71 3526 (& 6818) Fax: 34 976 71

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