Here are some Iâve found on the subject of art and art history. â 1  Art is not what you see, but what you make others seeâ -Edgar Degas. â 2 Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seenâ â Leonardo Da Vinci.
Other forms of vitamin B 3 include the corresponding amide and nicotinamide (niacinamide), where the carboxyl group has been replaced by a carboxamide group (CONH 2), as well as more complex amides and a variety of esters.
Niacin (also known as nicotinic acid, nicotinamide, niacinamide, vitamin B-3) is a B vitamin that is important in the normal functioning of the nervous system. Its commercial source is synthetic, and it may also be found in liver, yeast, meat, legumes, and whole cereals.equests from customers concerned about human-or animal-derived ingredients in their foods could also accelerate the use of synthetic L-cysteine in foods over feather-or human hair-derived L-cysteine. L-cysteine is considered a substance that is generally recognized as safe by the Food and Drug Administration.