Lecture 9-10

Lecture 9-10 - UC Davis, BME BIM 162 Quantitative Concepts...

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UC Davis, BME BIM 162 Quantitative Concepts in Biomolecular Engineering (Bio)molecules in solution: Lectures 09/10 Strength in numbers Josiah Willard Gibbs 1839 - 1903 “… one of the most original and important creative minds in the field of science America has produced.” (A. Einstein) Can we weigh a single molecule? Example titin (largest known protein): MW = mass of one molecule: need to weigh a lot of molecules at a time Dissolve molecules in water and inspect solution properties that depend only on the number of solutes What about counting the molecules (once we know their total mass)? only on the of solutes: • Vapor pressure “Colligative properties” • Freezing point • Boiling point • Osmotic pressure N
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Osmotic Pressure - Definition pressure force area Phenomenological definition: p  How is related to the number of dissolved molecules? solution thermodynamics Chemical Potential http://hyperphysics.phy-astr.gsu.edu/ hbase/thermo/thepot.html    GN G GN
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Lecture 9-10 - UC Davis, BME BIM 162 Quantitative Concepts...

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