Enrique PeacockLópez
Professor of Chemistry
at Williams since 1988
Education
Contact Information
 Office: Thompson Chemistry Laboratory
Room 212
 Lab: Thompson Chemistry Laboratory
Room 211

 Telephone: (413) 5972434

Courses Taught
Peacock attractor from QPL model of the Complemet's alternative pathway
Research interests
My group carries out a variety of nonlinear dynamics investigations of systems of biological interest. Recently we have studied chemical selfreplication, including crosscatalytic mechanisms and prion selfreplication. A second goal of our work is to elucidate the mechanism of transport of incompletely spliced mRNAs across the nuclear membrane, which is regulated by HIVRev protein. Our work is supported by the National Science Foundation through a Research in Undergraduate Institution grant from the Theoretical and Computational Chemistry section of the Chemistry Division and the Genes and Genome Systems program within the Molecular and Cellular Bioscience Division. (www.sciencestorm.com/award/0548622.html)
"Yet if we do not understand the cell, we can never completely understand
the organism. And if we do not understand the constituent molecules, we cannot
properly understand the cell. Molecules, therefore, must
be the starting point for our discussion of the living cell.." in "Molecular
Biology of the Cell" by Bruce Alberts et. al.
Nonlinear Dynamics in Chemistry,
Biology and Physics

Chemical and Biochemical Mechanisms as Dynamical Systems (
movie)
 In our research, we study chemical mechanisms from cell physiology and construct
models. The differential equations associated to the models are analyzed using
different software packages. We are interested in localizing regions in parameter
space where complex dynamic behavior appears.
 Some of the models and their corresponding physical systems are:
 Complex models  Complement system
 Autocatalytic template mechanisms
 Triple stranded DNA and self replicating molecules
 Negative feedback coupling  Hormone regulation  HIV1Rev regulation
 Minimal models  Glycolysis and hepathocytes
 Cascade mechanisms  Signal transduction
 Reactiondiffusion equation  Spatiotemporal patterns

 Population Dynamics  Food chains and mutualism
 Soft potentials  Generalized Duffing equation


 MATHEMATICA 6 and chemical selfreplication





Nonequilibrium Thermodynamics
Also, I am interested in studying the nonequilibrium thermodynamics of
chemical reaction in condensed phase.
Laberithm1 and Laberithm2 from Templator's reaction diffusion analysis.

 My daughter (Dartmouth 03) in La Republica Dominicana working for GrassRootSoccer as part of her requirements for a master's degree at Harvard School of Public Health.
La Familia at Dartmouth College Graduation
My daughter (Dartmouth 05) at Dartmouth
College
From "The Brothers K" by David James Duncan
"Vic Power, the Indians' Negro first baseman, is the hitter. It's weird to see a big black man like Power getting called an "Indian." Come to think of it, it's pretty strange to see a bunch of white guys running around calling themselves "Indians" too. How are real Indians supposed to feel about it? I mean, what if there was a team of Negroes and Indians called "the Cleveland White Guys"? I think a lot of palefaced folks wouldn't be all that thrilled. That's one big advantage the Yankees have: black, red, brown, or white, they look like Yanks, and act like Yanks, and are Yanks. None of this cutesy Oriole or Cub or WhiteIndian crap for them"

Some of my Williams research students


 Ang Li '11, MD/PhD Columbia U.
 S. J. Lou '09, Grad. School at Northwestern U.
 J. M. Chung '07, Teching at Horace Mann School (NY City).
 K. M. Beutel '06, Teach for America 0708 (Chicago); Grad. School at U. Minnesota.
 E. D. McGehee '05 , Harvard Law '10.
 J. Ishizuka '04, Rhodes Scholar (PhD Oxford 07) Postdoc  NIH; Med. School Harvard U..
 G. W. Albert '99, (MD/MPH Tufts U 03) Neurosurgery (University of Iowa)
 Geoffrey R. Hutchison '99, (PhD Northwestern 04) Assistant Professor U Pittsburgh.
 Leo L Tsai '98, (Herchel Smith Fellow, M. Sc. Cambridge U. 00) MDPhD Harvard U..
 Casey H. Londergan '97 (PhD UC San Diego 03) Assistant Professor, Haverford College
 Daniel B. Radov'96, (Herchel Smith Fellow, M. Phil, Cambridge U. 98) Research Associate at Harvard Business School.
 Elizabeth Juang '95, (PhD UC Berkeley 00)
 Carolyn S. Flesner'94, MS in Computer Science, Tufts University
 Ethan Marin'93, MD/PhD University of Michigan Medical School
 Katherine T. Queeney '92 (PhD Harvard 98) Associate Professor, Smith College.
 Darren K. MacFarland '91, (PhD U. Wisconsin 96), Senior Research Scientist at Luna Inovations.
 Michael W. Swartz '90, Candbridge Soft



Selected publications
 Name of undergraduate coauthors in boldface.
 Switching induced complex dynamics in an extended logistic map, Erik A.
Levinsohn, Steve A.
Mendoza and E. PeacockLópez, Chaos, Solitons and Fractals, 45, 426432 (2012).
(7 pages)

 Switching induced oscillations in the logistic map, Makisha P. S. Maier and E. PeacockLópez, Physics Letters A 374, 10281032 (2010). (5 pages)
 Selfregulation in a minimal model of chemica selfreplication, Sylvia J. Lou, and Enrique PeacockLopez, Journal of Biological Physics, 38, 349364 (2012). (15 pages)
 Modeling squarewave pulse regulation, Sylvia J. Lou, Annaliese K. Beery, and E. PeacockLopez, Dynamical Systems 25, 133143 (2010). (11 pages)
 Complex dynamics in a modified LotkaVolterra model with predator pairing, Syed Kashif Akhtar, Alison B. Peet and E. PeacockLópez, Journal of Biological Systems, 20, 87108 (2012). (22 pages)
 Bifurcation diagrams and Turing patterns in a chemical selfreplicating reactiondiffusion system with crossdiffusion, Jessica M. Chung and E. PeacockLópez, Journal of Chemical Physics 127, 174903 (2007). (7 pages)
 Crossdiffusion in the Templator model of chemical selfreplication, Jessica M. Chung and E. PeacockLópez, Physics Letters A 371, 4147 (2007).
(7 pages)
 Chemical Oscillations: Twovariable Chemical Models, Katheleen M Beutel and E. PeacockLópez, Chemical Educator 12, 224235 (2007). (12 pages)
 Complex dynamics in a crosscatalytics selfreplication mechanism, Katheleen M. Beutel and E. PeacockLópez, Journal of Chemical Physics 126, 125104 (2007). (5 pages)
 Chemical Oscillations and Turing Patterns in a generalized twovariable model of chemical selfreplication, Katheleen M Beutel and E. PeacockLópez, Journal of Chemical Physics 125, 024908 (2006). (8 pages) Selected by Virtual Journal of Biological Physics Research July 15 (2006). (8 pages)
 Bifurcations, and temporal and spatial patterns of a modified LotkaVolterra model, Edward A. McGehee, Noel Schutt, Desiderio A. Vasquez, and E. PeacockLópez, International Journal of Bifurcation and Chaos 18, 22232248 (2008).
(26 pages)
 Turing Patterns in a Modified LotkaVolterra Model, Edward A. McGehee and E. PeacockLópez, Physics Letters A342, 9098 (2005). (9 pages) .
 An introduction to Turing patterns in nonlinear chemical kinetics, Edward
A. McGehee and E. PeacockLópez, Chemical Educator 10, 8494 (2005). (11 pages)

Complex dynamics in a threelevel trophic system with intraspecies interaction.
Alison B. Peet, Peter A. Deutsch and E. PeacockLópez,
Journal of Theoretical Biology 232, 491503 (2005) . (13 pages)
 Elements of nonlinear dynamics in chemical kinetics, Jeffrey I. Ishizuka,
Hang Song and E. PeacockLópez, The Chemical Educator 9, 142151 (2004)
. (10 pages)
 Turing patterns in a selfreplicating
mechanism with a selfcomplementary template, L. L. Tsai, G. R.
Hutchison and E.PeacockLópez, Journal of Chemical Physics 113, 20032006 (2000) . (4 pages)

 Dynamic model of hormonal systems coupled by negative feedback, C. H.
Londergan and E. PeacockLópez, Biophysical Chemistry 73, 85107 (1998) . (23 pages)

 Mixedmode oscillations in a selfreplicating dimerization mechanism, E.
PeacockLópez, D. B. Radov and C. S. Flesner, Biophysical
Chemistry 65, 171178 (1997) . (8 pages)

 Steady state approximation in the minimal model of the alternative pathway
of complement, E. Juang and E. PeacockLópez, Biophysical Chemistry
65, 143156 (1997) . (14 pages)

 Chaos in a minimal model of the alternative pathway of the complement system,
E. PeacockLópez and K. L. Queeney, Biophysical Chemistry 63, 167183 (1997) . (17 pages)
 Chemical Oscillations in Enzyme Kinetics, K. L. Queeney, E. Marin,
C. A. Campbell and E. PeacockLópez, The Chemical Educator
1, Aug. (1996)(17 pages)
 Complex Dynamics in a Minimal Model of the Alternative Pathway of the Complement,
K. L. Queeney and E. PeacockLópez, Biophysical Chemistry 46, 101115 (1993).(15 pages)
 Theoretical Model of LDLReceptor Trapping on a Spherical Cell, M. W.
Swartz and E. PeacockLópez, Biophysical Chemistry 44, 19 (1992).
(9 pages)
 Twodimensional Reactive Systems: Rapid Bimolecular Processes on Spherical
Surfaces, M. W. Swartz and E. PeacockLópez, Journal of Chemical
Physics 95, 27272731 (1991). (5 pages)
Williams Chemistry