Colostrum immune cells (as lymphocytes) and many antibodies such as IgA, IgG, and IgM. These are some of the components of the adaptive immune system. In preterm infants some IgA may be absorbed through the intestinal epithelium and enter the blood stream though there is very little uptake in full term babies. This is due to the early "closure" of the intestinal epithelium to large molecule uptake in humans unlike the case in cattle which continue to uptake immunoglobulin from milk shortly after birth. Other immune components of colostrum include the major components of the innate immune system, such as lactoferrin,
Bilinear form form on a normed vector space is elliptic, or coercive, if there is a constant such that for all , Given a ring "R" and a right "R"-module "M" and its dual module "M", a mapping is called a bilinear form if for all , , . The mapping is known as the "natural pairing", also called the "canonical bilinear form" on . A linear map induces the bilinear form , and a linear map induces the bilinear form . Conversely, a bilinear form induces the "R"-linear maps and . Here, "M" denotes the double dual of "M". Bilinear form