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.
SP-A is a 34â36 kDa protein that facilitates the surface tension-lowering properties of surfactant phospholipids in the alveolus, regulates surfactant phospholipid synthesis, secretion, and recycling, and counteracts the inhibitory effects of plasma proteins released during lung injury on surfactant function (2) â .urfactant protein A has been shown to regulate the homeostasis of surfactant phospholipids, facilitate the lowering of surface tension in the alveolus, and prevent the inhibition of surfactant function by plasma proteins.