The lipids are a large and diverse group of naturally occurring organic compounds that are related by their solubility in nonpolar organic solvents (e.g. ether, chloroform, acetone & benzene) and general insolubility in water.hospholipids are the main constituents of cell membranes. They resemble the triglycerides in being ester or amide derivatives of glycerol or sphingosine with fatty acids and phosphoric acid.
As of now, research doesnât clearly indicate a specific cause of rheumatoid nodules and why exactly they develop in some patients and not in others. Given they generally form on extensor joints, rheumatoid nodules could be the result of repeated pressure on the affected joints over time.
Pulmonary (lung) nodules are growths or spots in the lungs. You may have just one nodule (called a solitary pulmonary nodule) or more than one (called multiple nodules). Lung nodules may be caused by: A lung cancer. A cancer that has spread (metastasized) to the lung from another part of the body.