Background. The etiology of vitamin B12 deficiency is diverse and includes lack of intrinsic factor (IF), altered pH in the small intestine, and lack of absorption of B12 complexes in the terminal ileum. Vitamin B12 deficiency from any cause, as well as folic acid deficiency, can result in megaloblastic anemia.he etiology of vitamin B12 deficiency is diverse and includes lack of intrinsic factor (IF), altered pH in the small intestine, and lack of absorption of B12 complexes in the terminal ileum.
The Last Supper (Italian: Il Cenacolo [il tÊeËnaËkolo] or L'Ultima Cena [Ëlultima ËtÊeËna]) is a late 15th-century mural painting by Leonardo da Vinci in the refectory of the Convent of Santa Maria delle Grazie, Milan. It is one of the world's most famous paintings.
Portrait with a thousand secrets: The mystery behind a masterpiece. The Arnolfini portrait by Jan van Eyck is one of the most popular masterpieces in Londonâs National Gallery. Painted in 1434 in Bruges, this small oil masterpiece on an oak panel has influenced painters from VelÃ¡zquez to David Hockney. It has become a symbol of marriage, yet the identity of the couple and the meaning of the scene are still uncertain.