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.
Microvilli are the minute finger- like elongated projections of the plasma membrane which exhibit a core of thin microfilaments. These microfilaments are held together to form bundles by cross-linking proteins known as villin and fimbrin. The main function of the microvilli is the absorption of certain substances. Cells produce microvilli, mainly, to increase the surface area for absorption (intestine surface), to transport absorbed materials, and to participate in the digestion of carbohydrates. In general, the length of a microvillus is about 0.5 to 1.0 Âµm and the diameter is about 0.1 Âµm.