November 2015 - Dr. Hannah Sivak, PhD

The Concept of Limiting Factors and it’s Application to Skin Care

November 10th, 2015 by Dr. Hannah Sivak

The graph above describes most biological processes that depend on the supply of nutrients or substrates. I first encountered it as a student of photosynthesis, trying to understand how the effect of light intensity and the concentration of carbon dioxide affected the rate of photosynthesis of a leaf or an alga. In this graph, “A” would have been carbon dioxide and “B” light intensity. You can keep increasing carbon dioxide concentration but then you reach a plateau. At that point, more carbon dioxide will not change the rate of the process, you will have to increase light intensity. Let’s use the graph to describe, for example, the division of skin…