Lecture 1 20100128 - CH339K Lecture 1 Metric Units Exponent...

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CH339K Lecture 1
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Metric Units Exponent Prefix Abb. Example 12 tera- T Total power output of human race is a couple of Terawatts 9 giga- G Intel's top processor (Q9650) runs at 3 gigaherz 6 mega- M Biggest bomb ("Tsar Bomba," 1961) ever made was about 60 megatons 3 kilo- k Average human male weighs about 70 kilograms. 2 hecta- h A mole of gas at STP occupies about 0.22 hectaliters 1 deca- da My yard (an acre) is about 2.5 decameters by about 7.5 decameters 0 A liter is about a quart. -1 deci- da A cup of coffee is about 2 - 2.5 deciliters. -2 centi- c The distance from the tip of your thumb to the knuckle is about 2.5 centimeters. -3 milli- m The thickness of a dime is about 1 millimeter. -6 micro- μ A typical bacterial cell is a couple of micrometers long. -9 nano- n Memory chip response times are measured in nanoseconds. -12 pico- p Inkjet printer drop sizes range from 3 to 25 picoliters -15 femto- f The radius of a lead nucleus is about 8 femtometers
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Common Slang Å Angstrom 10-10 m (0.1 nm) Used for atomic/molecular dimensions ml milliliter “mil” mg milligram “mig” μ l microliter λ or “lambda” μ g microgram γ or “gamma” mg/ml milligrams per milliliter “migs per mil” Used for macromolecule concentrations cal calorie 4.184 joules Older but common energy unit.
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Logs We don’t use much calculus in this class (about 10 minutes) but we use logarithms a lot! Log (x) = y where 10 y = x Ln (x) = y where e y = x e , the base of the natural logarithm, is defined as: If x = A x B, then log(x) = log(A) + log(B) if x = A / B, then log(x) = log(A) – log(B) if x = A B , then log(x) = B x log(A) = = 0 ! 1 k k e
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Elemental Composition of E. Coli Element By parts By mass H 63% 10% O 25.50% 64% C 9.50% 18% N 1.40% 3% Ca+ + 0.30% 2% P 0.20% 1% Cl - 0.08% 0.50% K + 0.06% S 0.05% Na + 0.03% Mg+ + 0.01%
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Why Carbon?
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Typical Covalent Bond Energies Bond Bond energy Bond energy kcal/mol kJ/mol C - C 83.1 348 C - O 84 351 Si - Si 42.3 177 Si - O 88.2 369 N - N 38.4 171 P - P 51.3 215
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Silicon-Based Life Form Species Horta Location Janus VI Habitat Subsurface chemotroph Discovered Stardate 3196
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Lecture 1 20100128 - CH339K Lecture 1 Metric Units Exponent...

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