i found the 2005 paper rather easy, if u study properly and actually absorb the 'technical' terms, its easy. The 2004 apper is a lot harder tho. and sum1 asked about microflora etc and what effect it has on eth pH of the skin....
§ explain the relationship between the natural pH of the skin and the action of
– microflora
– natural oil produced by glands in the skin
– perspiration
l The natural oil in the skin; Sebum is produced by sebaceous glands and is slightly acidic.
l The sweat or perspiration on our skin is produced by the sweat glands and is also slightly acidic. The composition of sweat varies according to the stimulus that produced its secretion. Sweat produced by heat is more acidic than sweat in response to exercise. A ‘cold-sweat’ that is secreted in response to intense excitement or fear has a more acidic pH.
l Most bacteria can survive in a narrow pH range. The bacterial microflora on our skin are able to survive acidic conditions with a pH range 4-6. Other harmful bacteria cannot usually survive this environment and so our acidic skin protects us from harmful bacteria or pathogens. Some of our microflora are able to breakdown the fatty acid molecules (from the natural oils) in our skin and thereby increase its acidity.
