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.
The phospholipid bilayer is a stable arrangement of amphipathic molecules, which have a hydrophilic, water-loving end and a hydrophobic, water-avoiding end. The hydrophobic fatty acid tails (wiggly orange lines) are on the inside. The hydrophilic polar (charged) heads are on the outside. Water is found on the outside but NOT on the inside.