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 Role of Phospholipids in Cell Function 91 D. Colicin Insertion into Membranes Bacterial toxins like the colicins also must insert into the membrane bilayer, but from the exterior of the inner membrane, in order to function in killing cells (Bourdineaud et al., 1990; Pattus et al., 1990).