For regions where f ''(x) is positive, the function is concave up; where f ''(x) is negative the function is concave down. So, looking at the graph of f '(x), wherever slope is positive, you've got a positive second derivative and the function is concave up.
U-Meleni was a part of a group of Artists conducting workshops on spoken word and creative writing showing how it can be used to empower and create change. U-Meleni then travelled to ZIMBABWE for three weeks ( Aug 13-Sept 2, 2006) to spend time with family and friends.
Eumelanin is brown or black color pigment and protects the skin from absorbing the harmful UV rays. People with darker skin tones have more of Eumelanin.This is the reason melanin pigments are called as photo-protectants which means a substance that can provide protection from the harmful sun rays.umelanin is brown or black color pigment and protects the skin from absorbing the harmful UV rays. People with darker skin tones have more of Eumelanin.This is the reason melanin pigments are called as photo-protectants which means a substance that can provide protection from the harmful sun rays.