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.
A. A lung nodule is a small, solid abnormality in the lung. Nodules are most commonly detected on a chest X-ray or CT scan. There are many causes of nodules. Depending on the cause, a nodule may have no importance or it may represent a serious disease. Some of the most common causes of lung nodules include: 1  Scar tissue. lung nodule is a small, solid abnormality in the lung. Nodules are most commonly detected on a chest X-ray or CT scan. There are many causes of nodules.