Methyl-B 12 is absorbed by an intestinal mechanism using intrinsic factor and by a diffusion process in which approximately 1% of the oral dose is absorbed. The human physiology of vitamin B 12 is complex, and therefore is prone to mishaps leading to vitamin B12 deficiency.ecause intrinsic factor is crucial for the normal absorption of B 12, its lack in pernicious anemia causes a vitamin B12 deficiency. Many other subtler kinds of vitamin B 12 deficiency and their biochemical effects have since been elucidated.
Gail Levin, âEdward Hopperâs Nighthawks, Surrealism, and the War,â Art Institute of Chicago Museum Studies 22, 2 (1996), pp. 180-95, fig. 1. The Art Institute of Chicago: Twentieth-Century Painting and Sculpture, selected by James N. Wood and Teri J. Edelstein (Art Institute of Chicago, 1996), p. 85, ill.
The second largest art museum in the country, this Beaux-Arts-style building houses many of the world's most important works (American Gothic, Nighthawks, and A Sunday Afternoon on the Island of La Grande Jatte to name a few).