"Living things are too beautiful
for there not to be a mathematics
that describes them."
--- Tom Schneider
 
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Molecular Information Theory
and
the Theory of Molecular Machines

by Tom Schneider
schneidt@mail.nih.gov
Molecular Information Theory Group
Gene Regulation and Chromosome Biology Laboratory (GRCBL)
Center for Cancer Research, National Cancer Institute
National Institutes of Health in Frederick, MD

  Molecular information theory is the application of Claude Shannon's information theory to molecular patterns and states.
Shannon uncertainty equation: H equals the negative sum from i equals 1 to M of P sub i log 2 p sub i bits per symbol.
Shannon channel capacity equation: C equals W log base 2 of P over N plus 1 bits per second.
Brief overview: Tom Schneider is best known for inventing sequence logos, a computer graphic depicting patterns in DNA, RNA or protein that is now widely used by molecular biologists. Logos are only the beginning, however, as the information theory measure used to compute them gives results in bits. But why would a binding site have some number of bits? This led to a simple theory: the number of bits in the DNA binding site of a protein is the number needed to find the sites in the genome. Click on the dinosaur to see how these evolve! Next Tom asked how are bits related to binding energy? He solved this problem by using a version of the second law of thermodynamics to convert the bits to the energy needed to select them. Dividing the bits used to define a binding site by the bits that could have been selected for the given energy, he then discovered that the efficiency of DNA binding site selections is near 70% and he constructed a theory to explain this result. Schneider has a number of nanotechnology patents derived in part from this theory.
If you want to understand life, don't think about vibrant, throbbing gels and oozes, think about information technology.
--- Richard Dawkins, The Blind Watchmaker, 1986, Norton, p. 112.
Note: These pages use two addional windows, a glossary and references. You can use frames in the bar to the left or launch them separately by clicking on these links. Once you have launched the windows, you can instantly look up papers or get glossary definitions. You can try this with the icons to the right in the green bar.
THIS IS THE NEW LOCATION of the website
This website now has a new home: http://schneider.ncifcrf.gov/. Also, I've set up a permanent url that will always point to wherever this page goes: http://alum.mit.edu/www/toms/. If you bookmark the MIT address (as opposed to where it currently points) you will always find this page.
human donor splice site sequence logo
Sequence logos
were invented here!
sequence walker for human donor splice junctions
Sequence walkers
were invented here!
head of Tyrannosaurus Rex
Evolution -
how DNA gets information!
gumball machine
Sphere packing -
biological states!
Geometry for optimal bistate molecular machines. Two concentric circles are connected by a horizontal line segment running from the outer circle on the left, tangent to the inner circle in the middle and to the outer circle on the right. Behind the circles are concentric colors in a spectrum running red at the center to purple on the edge representing lower to higher energy.
Molecular efficiency -
a measure of biological states

Nanotechnology

nanotechnology: molecular rotating engine
Molecular Rotation Engine
U.S. Patents 7,349,834 and 8,086,432
Molecular computer circuit diagram for a NOR gate made from one repressor protein blocking two different activator proteins.
Molecular Computer
U.S. Patent 6,774,222
nanotechnology: Medusa(TM) Sequencer
MedusaTM Sequencer
U.S. Patent 7,871,777 		nanotechnology: Rod-Tether Nanoprobe
Rod-Tether Nanoprobe
Patent claims allowed!
US Patent No. 8,344,121 Issued January 1, 2013

All Positions are currently closed

I maintain a mailing list for announcements of changes to Delila programs and this web site. If you would like to be on the list, just ask: schneidt@mail.nih.gov

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    a scroll of paper, an ink well and a feather pen Thanks for visiting!   For comments, problems, questions or suggestions please contact Tom Schneider.

    This page is at: http://alum.mit.edu/www/toms. That's what you should be sure is in your bookmarks since it is Tom Schneider's permanent URL at MIT. That URL redirects to the current location of the web site.

    A tiny URL for this web page is tinyurl.com/tomschneider; it also points to the MIT web page and hence is permanent.

    You can view earlier pages with the incredible: Internet Archive WaybackMachine:

    1. WaybackMachine link for http://www-lmmb.ncifcrf.gov/~toms/
    2. WaybackMachine link for http://www-lecb.ncifcrf.gov/~toms
    3. WaybackMachine link for http://lecb.ncifcrf.gov/~toms
    4. WaybackMachine link for http://ccrnp.ncifcrf.gov/~toms
    5. WaybackMachine link for http://www.ccrnp.ncifcrf.gov/~toms
      This page USED TO BE at the above locations; they may still work but are not recommended for bookmarking.
    6. WaybackMachine link for http://schneider.ncifcrf.gov/ This is the current location.
    This page USED TO BE at those locations; they still work but are not recommended for bookmarking.

    NIH Web Privacy Notice CCR Policies
    any browser campaign that says best viewed with any browser

    Disclaimers For This Web Site (From: World Wide Web NIH Guidance, April 15, 1998)

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