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.
Noncancerous pulmonary nodules can develop from conditions that cause inflammation or scar tissue on the lungs. Possible causes include: lung infections, such as mycobacterium tuberculosis; granuloma, which are small clumps of cells that grow because of inflammation; noninfectious diseases that cause noncancerous nodules, such as sarcoidosis and rheumatoid arthritis; neoplasms, which are abnormal growths that can be benign or cancerous