Introduction. Silicosis is a long-term lung disease caused by inhaling large amounts of crystalline silica dust, usually over many years. Silica is a substance naturally found in certain types of stone, rock, sand and clay.Working with these materials can create a very fine dust that can be easily inhaled.ilicosis is a long-term lung disease caused by inhaling large amounts of crystalline silica dust, usually over many years.
Phospholipids are a class of lipids that are a major component of all cell membranes. They can form lipid bilayers because of their amphiphilic characteristic. The structure of the phospholipid molecule generally consists of two hydrophobic fatty acid tails and a hydrophilic head consisting of a phosphate group.
Most phospholipids contain a âdiglycerideâ, a phosphate group and a simple organic molecule such as choline, which is a water-soluble essential nutrient. In water based solution, the phospholipids automatically arrange themselves into a double layer, or as a âphospholipid bi layerâ.The fatty acids, which repel water, are found in the middle of the bi layer.n water based solution, the phospholipids automatically arrange themselves into a double layer, or as a âphospholipid bi layerâ. The fatty acids, which repel water, are found in the middle of the bi layer.