1 Aden, Yemen is at 12 49'N, 45 1'E, 3 m (10 ft). 2  See map. 3  Aden has a subtropical desert / low-latitude arid hot climate (K ppen-Geiger classification: BWh). 4  The annual average temperature is 29.2 degrees Celsius (84.5 degrees Fahrenheit).
The core of a sphingolipid is an amino alcohol called sphingosine. Complex sphingolipids located in the plasma membrane of animal cells (especially nerve cells) have a structural function and are believed to protect the cell surface from harmful environmental factors.
Phospholipids are the most abundant type of lipid. There are two types, phosphoglycerides and sphingolipids. Phospholipids are compused of a small polar head (choline, ethanolamine, serine, or inositol) attached to a lipid backbone made up of glycerol of sphingosine.