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 align themselves in a tail-to-tail formation with their heads facing outward which creates a double layer membrane. This bilayer structure is used by cells throughout the body for outer membranes as well as for structures inside each cell.Anatomy of a phosphatidylcholine molecule.nlike phosphates, which are attracted to water (hydrophilic), fatty acids are repelled by water (hydrophobic). It is this very love/hate relationship with water that allows phospholipids to form cellular membranes â and liposomes as well.