DEA 3.0 System: Dogs may have a DEA 3 system of blood type, if their blood has two antigens, DEA 3.0 and DEA Null. This is a rare type of blood and occurs in only in 5 â 6% of dogs. The most common breed with a DEA 3.0 positive type blood are grey hounds, in which 23% of all population is considered positive. If the dog is incompatible for this blood type and is transfused, erythrocytes or blood cells are usually replaced in 3 â 5 days, automatically.
Executive Summary. 1  The bloodâbrain barrier (BBB) is a significant obstacle to therapeutic delivery for CNS disorders. Among various strategies, nanobiotechnology plays an important role in facilitating drug delivery across the BBB. 2  Desirable characteristics of the ideal method of therapeutic delivery across the BBB are described in this article.
blood-brain barrier, n barrier formed by epithelial cells in the capillaries that supply the brain and central nervous system. This barrier selectively allows entry of substances such as glucose, some ions, and oxygen, while blocking entry of other substances.he blood-brain barrier prevents or slows the passage of some drugs and other chemical compounds, radioactive ions, and disease-causing organisms such as viruses from the blood into the central nervous system.