roma, ss 2005 autopoiesis and the definition of … · autopoiesis and the definition of the living...
TRANSCRIPT
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AUTOPOIESIS AND THE DEFINITION
OF THE LIVING
( AN OVERVIEW OF THE ORIGINAL
BIOLOGICAL AUTOPOIESIS, AND ITS
RELATIONSHIP
WITH COGNITION)
PIER LUIGI LUISI
Roma, SS 2005
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What is life?
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THE MOST COMMON NOTION OF LIFE:
LIFE AT THE LEVEL OF POPULATION GROWTH
AS A GENETIC FLUX OF INFORMATION FROM
GENERATION TO GENERATION
WHICH IMPLIES THE HISTORICAL DIMENSION
OF EVOLUTION
THE THREAD WHICH LINKS ALL LIVING BEINGTO ONE ANOTHER FROM THE VERY BEGINNING
OF LIFE
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BUT ALSO:
LIFE AT THE INDIVIDUAL LEVEL,
LIFE HERE AND NOW
A DEFINITION WITHOUT THE CONSTRAINS
OF GENETICS
Valid more in general
When you do not know or cannot establish the
genetic heritage
For synthetic systems
For unknown (e.g. exobiology) systems...
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Alexander I. Oparin gave a description of life based on six properties:
(1) capability of the exchange of materials with the surrounding
medium;
(2) capability of growth;
(3) capability of population growth (multiplication);
(4) capability of self-reproduction;
(5) capability of movement;
(6) capability of being excited.
He also added some additional properties, such as the existence of a
membrane (a cardinal principle for him); and the interdependency
with the milieu
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..WHAT IS LIFE?
THE STORY OF THE GREEN MAN
AND THE FARMER
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THE GAME OF THE TWO LISTS
LIST OF THE LIVING
The fly
The tree
The mule
The baby
The mushroom
The amoeba
LIST OF THE NON-LIVING
The radio
The automobile
The robot
The crystal
The moon
The computer
QUESTION: What discriminates the living from the non-living?
IN OTHER WORDS: What is the quality (or qualities) which is present in all members
of the "living list" and which is not - and cannot - be present in
any of the elements of the "non-living" list?(
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What is life ?A common sense definition at individual level( LIFE " HERE AND NOW " )
A living system is a system defined by a physical boundary which allowsthe assimilation of nutrients / energy from the outside, and which is ableto self-maintenance and self-generation owing to the activity of the systemfrom within the boundary.
Notice that for this first-level definition no scientific knowledgeon cellular structure or molecular biology is needed.Notice also that self-reproduction or evolution are at this first-level( life here and now ) not necessary.
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A maze illustrating the chemical reactions that interconvert small molecules in cells.
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CC
CCN A B C
H G D Q
M
DNA RNA Proteins
wallcomponents
N
H
various organells
NUTRIENTS / ENERGY
CC
CC
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how does a cell work ?
- a semipermeable membrane discriminates “self” from
“non-self” & allows energy / nutrients in and byproducts out
- and determines a particular microenvironment which
induces a specific reaction network
- by which several components are transformed and
continuously replaced
- so that the cell maintains its own identity (“self”) in the face
of an on-going series of transformations
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THE CELL MAIN ACTIVITY IS
TO MAINTAIN IST OWN IDENTITY
(SELF-MAINTENANCE)
DESPITE THE ENORMOUS NUMBER
OF TRANSFORMATIONS
AND THE CELL DOES SO
THANKS TO A PROCESS OF
RE-GENERATION FROM WITHIN
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The cellular definition of life:
A system spatially defined by a
boundary of its own making
and that is self-sustaining
by re-generating all system‘s components
from the inside
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autopoietic unity = minimal life
an autopoietic unity is able to self-generate owing to a reaction networktaking place within its own boundary "
"
(the reaction network makes all components of theunit, including the boundary.)
Varela et al., Biosystems, 5 (1974) 187
" self-generate"self-maintenanceorself-reproduction
in general
self-reproduction = self-replication
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AUTO POIESISAUTO POIESIS(SELF PRODUCING)(SELF PRODUCING)
Maturana & Varela, 1970 .....Maturana & Varela, 1970 .....
Varela, Maturana, Varela, Maturana, UribeUribe
BiosystemsBiosystems 5 (1974) 187 5 (1974) 187
F. Varela, Principles of biological autonomyF. Varela, Principles of biological autonomy
north Holland 1979north Holland 1979
G. G. FleischhakerFleischhaker
BiosystemsBiosystems 22 (1988) 37 22 (1988) 37
P.L. Luisi in "Thinking about Biology"P.L. Luisi in "Thinking about Biology"
W. Stein + F. Varela editorsW. Stein + F. Varela editors
Addison-Wesley, 1993Addison-Wesley, 1993
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A DISCOVERY: THE CELLULAR
(AUTOPOIETIC)
DEFINITION OF LIFE
ALSO APPLIES
TO MULTICELLULAR,
MACROSCOPIC
LIFE
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molecularmolecularcomponentscomponents
BoundedBounded
systemsystem
producesproduces generatesgenerates
determinedetermine INPUTINPUT
OUTPUTOUTPUTmetabolicmetabolicreactionreactionnetworknetwork
Autopoiesis (as minimal life)Autopoiesis (as minimal life)uncodeduncoded
codedcoded
Autopoiesis is the most general pattern of minimal life.Autopoiesis is the most general pattern of minimal life.
It does not specify the actual structures and theirIt does not specify the actual structures and their
mechanistic processes.mechanistic processes.
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sottoprodotti
nutrienti / energia
transforma i nutrienti nei
componenti molecolari
i quali
LA DEFINIZIONE CICLICA
DEL "SELF"
(...la vita ubbidisce ad una logica ciclica...)
determina un
microspazio che
spontaneamentesi organizzano
nella struttura
chiusa la quale
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self-maintenance from within,due to a dynamic network of interactions,which are defined and constructedby the system itself"
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... if some hitherto inconceivable entity were to exhibit autopoietic
organization, that alone would suffice to distinguish it as living ...
But ! ...
if something exhibits autopoietic production, that "something" is living.
Autopoiesis is a minimal definition, in that autopoietic organization
is the one phenomenon which is common to every member of life's
kingdoms on earth - and yet does not exist among the constituents
of their non-living surroundings.
Fleischaker (1990)
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Life is an emergent property:
the components (nucleic acids,
proteins, lipids, sugars etc)
are per se’ not living;
When they are assembled together
in a particular space/time
structure, then life emerges
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DNA
RNA
H
CH
OR COOH
liposomes
proteins
poly-sacharides
aminoacids lipids sugarmono-
nucleotides
DNA RNA
bio-polymers
bio-monomers
Simple molecules
living cell
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The paradigm of molecular
science:
The phenomenological world-including life-is
constituted solely by molecules and their
dynamic interactions
„dynamic interactions“ may involve however a very complex set
of processes and properties-
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SS SS SSSS
SSSS
SS
SS SS
SS
SS
SS
SS
SS
SS
SS
SSSS
SS
SS
SS
SS
PP
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AA SS
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AUTO POIESIS(SELF PRODUCING)
Maturana & Varela, 1970 .....
Varela, Maturana, Uribe Biosystems 5 (1974) 187
F. Varela, Principles of biological autonomy, north Holland 1979
G. Fleischhaker, Biosystems 22 (1988) 37
P.L. Luisi in "Thinking about Biology" W. Stein + F. Varela editors Addison-Wesley, 1993
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THE MINIMAL AUTOPOIETIC SYSTEMTHE MINIMAL AUTOPOIETIC SYSTEM
vvgengen ==d[S]d[S]
dtdtvvdecdec ==
- d[S]- d[S]
dtdt;;
if vif vgengen == vvdecdec
if vif vgengen >> vvdecdec
homoestasishomoestasis
self - reproductionself - reproduction
SSSS SS
SS
SS
SS
SS
SS SS
SS
SS
SS
SS
SS
SS
SS
SSSS
SS
SS
SS
SS
PP
PP
AA SS
AA
PP
PP
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CHEMICAL AUTOPOIESIS:
FOR SELF-REPRODUCTION OF CLOSED
VESICULAR STRUCTURES, SEE
NATURE 357 (1992) 57; 409 (2001) 387
J. AMER.CHEM.SOC. 98, (1994) 1160; 117 (1995) 1299
CHEM.& BIOLOGY 3 (1996) 277
FOR MODELS OF SELF-MAITENANCE
SEE:
ANGEW. CHEMIE 40 (2001) 199
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three criteria of autopoiesisthree criteria of autopoiesis
applications of these criteria permits one to discriminateapplications of these criteria permits one to discriminate
between the living and the non-living. Only if you answerbetween the living and the non-living. Only if you answer
yes three times is the system autopoietic and thereforeyes three times is the system autopoietic and therefore
living.living.
Self-boundary: Self-boundary:
Does the system have a boundary of its own making?Does the system have a boundary of its own making?
Self-maintenance:Self-maintenance:
Is the system capable of maintaining its own identity viaIs the system capable of maintaining its own identity via
dynamic processes, i.e. those components which are beingdynamic processes, i.e. those components which are being
used up are made anew by the system itself?used up are made anew by the system itself?
Self-generation:Self-generation:
does this happen throughout a network of reactions whichdoes this happen throughout a network of reactions which
are generated by the system itself?are generated by the system itself?
1.1.
2.2.
3.3.
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Consider a growing crystal:
Is it living?
Apply the criteria of autopoiesis
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Protein coat
DNA
SheathCore
Fibre
}}
"Head"
"Tail"
0.2 m
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CONCEPTS RELATED TO AUTOPOIESIS
BOUNDARY
ORGANIZATION AND STRUCTURE
EMERGENCE
HOMEOSTASIS
SELF-MAINTENANCE; SELF-GENERATION
AUTONOMY; SELF-IDENTITY
CODED AND UNCODED LIFE
DISSIPATIVE STRUCTURES
STRUCTURAL COUPLING
SYSTEM!S HISTORYSOCIAL AUTOPOIESIS
COGNITION
MIND AND MATTER
CONSCIOUSNESS
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what autopoiesis does not contain :
origin of lifeevolution / mutation
1) ...because autopoiesis isprimarily interested in defininglife here & now
2) and also because the aboveproperties are easily implementedin an actual operatingautopoietic system.
Notabene :cellular evolution is a consequenceof life - not its cause....The autopoietic unit must preceedits own evolution.
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molecularmolecularcomponentscomponents
boundedboundedsystemsystem
producesproduces generatesgenerates
determinedetermine INPUTINPUT
OUTPUTOUTPUT
metabolismmetabolism
proteinsproteinsDNA,RNADNA,RNA
a system confined by a chemical boundary anda system confined by a chemical boundary and
which contains a network of nucleic acid - protein -which contains a network of nucleic acid - protein -
based reactions which is able to transform externalbased reactions which is able to transform external
energy / nutrients into self-energy / nutrients into self-maintainancemaintainance and and
self-generation.self-generation.
LIFE ISLIFE IS
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SS
SS
S
S
S
S S
S
S
S
S
S
S
S
SS
S
S
S
S
P
P
A S
A
P
P
If the boundary is a social
structure( a city, a party, an hospital...)
and A a new person who becomes
a member ( S )....
Towards social autopoiesis
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byproducts
New incoming people determinesan activity/response
which
transforms the new peopleinto members of the systemwho
spontaneously assembleinto the boundedstructure which
Towards social autopoiesis
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SOCIAL AUTOPOIESIS ( ? )SOCIAL AUTOPOIESIS ( ? )
- a nation- a nation
- a political party- a political party
- religion- religion
- family- family
- one city- one city
- any social system ?- any social system ?
- Gaia- Gaia
(substructures or individuals)(substructures or individuals)
which are being reproducedwhich are being reproduced
from withinfrom within
structurestructure
& &
organizationorganization
couplingcoupling
interactionsinteractions
(+ history)(+ history)
boundary definedboundary defined
(and created) from within .......(and created) from within .......
" self-maintenance from within, due to a " self-maintenance from within, due to a
dynamic network of interactions, which aredynamic network of interactions, which are
defined and constructed by the system itself "defined and constructed by the system itself "
} AABB
CC
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HOW DO YOU PROCEED
EXPERIMENTALLY
FOR CONSTRUCTING
IN THE LABORATORY
AN AUTOPOIETIC SYSTEM
AS A CELLMODEL?
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Liposomes, as closed spherical
bilayers, are considered the most
likely precursors of early living cells
(protocells)
LIPOSOMES ARE JUST TINY SOAP BUBBLES
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What is life?What is cognition?
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LifeLifeEnvironmentEnvironment
Coupled interactionCoupled interaction
SANTIAGO THEORY :SANTIAGO THEORY :
Life = interactionLife = interaction
with the environmentwith the environment cognitioncognition
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..A HISTORY OF COUPLING INTERACTIONS FROM
WHICH THE COGNITIVE DOMAIN IS CONSTITUTED
NEITHER INTERNALLY (A SOLIPSISTIC VIEW) NOR
EXTERNALLY (THE TRADITIONAL VIEW).
THE ALTERNATIVE THAT ELIMINATES THESE
TWO EXTREMES IS BASED ON A CO-DEFINITION
BETWEEN THE INTERNAL AND EXTERNAL SYSTEM.
THIS IS THE NOTION OF ENACTION.
ENACTING MEANS TO MAKE EMERGE
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the organism creates from the environment
its own world(! cognition, ! enacting)
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evolution:
the history of coupling interactions
a living organism as the
depositary of a long history
of adaptive changes
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...it is the organism itself,
with ist receptors, nervous centers,
movement of the organs,
which chooses the stimuli,
to which it is sensitive.
The environment comes out
of the world with the actualization
of the organism‘ essence...
Merleau –Ponty, „The structure
Of Behaviour“
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THE MAIN ASSUMPTION OF THE SANTIAGO SCHOOL
IS THE EQUIVALENCE BETWEEN THE PROCESS
OF COGNITION
AND THE PROCESS OF LIFE
ACCORDING TO THIS VIEW, BRAIN IS NOT
NECESSARY FOR COGNITION: BACTERIA AND
PLANTS DO NOT HAVE A BRAIN,
THEY POSSESS HOWEVER COGNITIVE CAPABILITY
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ON THE BASIS OF THE EQUIVALENCE
BETWEEN LIVING STRUCTURE AND
THE ACT OF COGNITION, THE OLD
CARTESIAN
SEPARATION BETWEEN MATTER AND
SPIRIT
IS SUPERSEEDED.
THESE TWO CATEGORIES
ARE NO LONGER DISTINCT ENTITIES,
THEY ARE TWO FACES OF THE SAME
PHENOMENON:
LIFE
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Life (a process)
cognition
co-emergence
autopoietic
unit
environment
the autopoietic structure
selects out from the
environment its own
world; the environment
elicits (enacts) the
organism!s being
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Life (a process)
consciousness
co-emergence
world
co-emergence:
man!s sensoriummakes its own
world; the world
enacts man!sexistence.
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Inanimate matter
Animal
life
consciousness
consciousness
matter
Life and makind
universum
matter
life
consciousness
The science view The Buddhist view?
Do we need a
Beginning?
QUESTIONS FOR THE DIALOGUE SCIENCE/BUDDHISM:
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THE LEGACY OF FRANCISCO VARELA:
HARMONISE THE SCIENTIFIC MOLECULAR VIEW
(THERE ARE ONLY MOLECULES AND
THEIR INTERACTIONS)
WITH
THE HUMANISTIC AND SPIRITUAL ASPECTS
OF LIFE
(CONSCIOUSNESS, ETHICS, ART, POETRY,
RELIGIOSITY)