Biomaterials Flashcards
What are the roles of water
- Solvent- in sugar, amino acid etc. all polar
- Temp buffer-high specific heat capacity
- Metabolite-collection of reactions in cells (metabolism). Water is reactant.
How much % of body made of water
65%
What influences reactions in body
- Enzymes- catalyse reactions & are molecules with temp optimum & pH (7.4)
- Salt conc
Extremeophiles
Extremophiles are organisms that survive in extreme conditions, like high heat, cold, salinity, or acidity. Examples include thermophiles (heat-loving) and halophiles (salt-loving).
pH equation & Kw
pH=-log[H³O+]
Where [H³O+]= 1M to 10^-14
Ke=[H+][OH-]
Where pH+pOH=14
Deadly pH value
<6.8 or 7.8>
What’s an acid
Proton donor. Must contain H in formula
What’s a base
Proton acceptor. Must contain a lone pair of e- to bind with H+
Acid + Base—> Conjugate acid + Conjugate base. What is Ka
Ka= ([C acid][C base]. )/ [HA]
Name some strong acids
HClO3 HCLO4….post H+ halogen combos
Name some strong base
Group 1 metals with OH (grp2??)
Weak base & acid eg
HF, HCN, H2S-acid
HS-, C5H5N-base
Equation of pH of a weak acid (don’t need for exams)
PH= pka +log([A-][HA])
(Ca-x)—>x + x
Where x= [H]
[H]²+Ka[H]- KaCa=0
(Henderson-Hasselbalch equation)
Buffer
Le chatelier
Homeostasis
Property of a system in which variables are regulated so that internal conditions remain stable & relatively constant
