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.
Causes of Solitary Pulmonary Nodules. Solitary pulmonary nodules may have the following causes: Neoplastic (an abnormal growth that can be benign or malignant): Lung cancer; Metastasis (spread of cancer from other parts of the body to the lung) Lymphoma (a tumor made up of lymphoid tissue) Carcinoid (a small, slow-growing tumor that can spread)