coping with complexity april 1999 john j. tyson department of biology virginia tech
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Coping with Complexity April 1999 John J. Tyson Department of Biology Virginia Tech. Biology is the science of living things in all their complexity. “Hey! What’s this Drosophila melanogaster doing in my soup?”. “To the death, Carlson! Hang on to the death!”. - PowerPoint PPT PresentationTRANSCRIPT
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Coping with ComplexityApril 1999
John J. TysonDepartment of Biology
Virginia Tech
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Biology is the science of living things in all their complexity
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“Hey! What’s this Drosophila melanogaster doing in my soup?”
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“To the death, Carlson! Hang on to the death!”
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April 26. After several months I now feel that these strangelittle rodents have finally accepted me as one of their own.
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“If there is an equation for a curve like a bell,there must be an equation for one like a bluebell,and if a bluebell, why not a rose?Do we believe nature is written in numbers?”
Thomasina, in Tom Stoppard’s play, Arcadia
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What good is mathematics?
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Mathematics isa disciplined way of thinking...
– about numbers– about shapes – about patterns … in space and time
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Why the Disconnect?
• Until recently the complexity of most biological problems was too great for the mathematical tools available.
• Now we have the tools, but we don’t speak a common language.
• My purpose is to open a serious dialog between mathematicians and biologists...
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The Golden Rectangle
L
W
618.12
51
01
1
1
2
2
W
L
W
L
W
L
W
L
W
L
W
L
W
WL
L
W
W L-W
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The GR is “self-similar”…expand by (1.618)4 6.854
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William Harvey, 1628An Anatomical Treatise of the Motion
of the Heart and Blood
sinksource
1 50
190 1 600
gal
16 beats
beats
min
60 min
hour
gal
hour
pounds
hour
,
Harvey’s conclusion: blood must circulate!
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Kermack & McKendrick, 1927Infectious Diseases
S = fraction of population that is susceptibleI = fraction of population that is infectious
dI/dt = S I - I
deathor recovery by
infecteds of loss
infections
new of rate
fraction infectious
of change of rate
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time
1
susceptible fraction
infectious fraction
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Plague in Eyam, England, 1666
= 0.14 per day
= 0.09 per day
Susceptibles
Infectives
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SI I S
Ro
, when
1
1
Basic reproductive rate
For infection to spread,
rate of new infection > rate of removal
Ro = 1.6for plague
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Can we stop the spread of infection by immunization?
p
p
Rp
R p
pR
o
o
proportion immunized
proportion susceptible
1
11 1
11
( )( )
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Disease Ro p
Plague 1.6 40%
Smallpox 4 75%
Polio 7 85%
Measles 20 95%
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The Overcrowding Game...
space
= available = occupied
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time
space
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time
space
overcrowded
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space
time
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Pascal’s Triangle
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Bushes and TreesArteries and Veins
Bronchial tubes
Self-similar, One-dimensional (lines)
Pascal’s Tree
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Olivia(mollusc)
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Hans Meinhardt, The Algorithmic Beauty of Sea Shells
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Cymbiola (pattern = Serpinski’s gasket)
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585.1log(2)
log(3) dimension
Serpinski’s Gasket
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Johnson HallHuman geometry is Euclidean
Wild CarrotLife’s geometry is fractal P. Prusinkiewicz, Univ. Calgary
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By this time everyone had learnedhow careful you have to bewhen dealing with numbers.
E.B. WhiteThe Trumpet of the Swan
Fractional dimension???
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Excitable medium...
= resting = excited = refractory
space
space
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J. KeenerA. Panfilov
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DNA Sequence Analysis
New sequence: …AGAACCCTAG…
…GACCATAGCG…Dictionary sequence:
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A G A A C C C T A G
GACCATAGCG
The DNA sequence game...
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A G A A C C C T A G
GACCATAGCG
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A G A A C C C T A GG -1 -1 -5 -6 -7 -8 -9 -10-11-9A-1 -2 2 -2 -3 -4 -5 -6 -8 -7C -5 -2 -2 1 1 0 -1 -5 -6 -7C -6 -6 -3 -3 4 4 3 -1 -2 -3A -4 -7 -3 0 0 3 3 2 2 -2T -8 -5 -5 -4 -1 -1 -1 6 2 1A -6 -9 -2 -2 -2 -2 -2 2 9 5G -10 -3 -6 -3 -3 -3 -3 1 5 12C -11 -7 -4 -7 0 0 0 0 4 8 G -12 -8 -8 -5 -4 -1 -1 -1 3 7
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A G A A C C C T A GG -1 -1 -5 -6 -7 -8 -9 -10-11-9A-1 -2 2 -2 -3 -4 -5 -6 -8 -7C -5 -2 -2 1 1 0 -1 -5 -6 -7C -6 -6 -3 -3 4 4 3 -1 -2 -3A -4 -7 -3 0 0 3 3 2 2 -2T -8 -5 -5 -4 -1 -1 -1 6 2 1A -6 -9 -2 -2 -2 -2 -2 2 9 5G -10 -3 -6 -3 -3 -3 -3 1 5 12C -11 -7 -4 -7 0 0 0 0 4 8 G -12 -8 -8 -5 -4 -1 -1 -1 3 7
AGAACCCTAG . . . GA . CCATAGCG
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Mycoplasma genitalia
• 600,000 nucleotides (letters)• 500 genes (words), 2/3 recognized• How are the “words” organized into
meaningful “sentences” and “paragraphs”?
...ATAGCCCTAGTCAAGTCATGGTCGAAC...
Human genome3,000,000,000
300,000
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Lab for Bioinformatics, Keio University, JapanThe Institute for Genomic Research, Rockville MD
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dR
dtdR
dt
dR
dt
1
2
127
...
...
...
...
glucose
protein
time
lipid
Do we really need an equation for every gene???
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Solar System9 planets + assorted moons
20 bodies x 3 degrees of freedom x 2 diff eqs= 120 differential equations
(comparable to 1/4 Mycoplasma genitalia)
We do not have to solve all these equationsin order to put a man on the moon or send
an orbiter to Jupiter and beyond!
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Mathematics is a tool for thinkingabout complex patterns in a precise
yet creative way.