placental barrier — noun : a semipermeable membrane made up of placental tissues and limiting the character and amount of material exchanged between mother and fetus … Useful english dictionary
placental transmission — n passage (as of antibodies or hormones) across the placental barrier … Medical dictionary
barrier — 1. An obstacle or impediment. 2. In psychiatry, a conflictual agent that blocks behavior that could help resolve a personal struggle. [M.E., fr. O.Fr. barriere, fr. L.L. barraria] blood air b. the material intervening between alveolar air and the … Medical dictionary
placental membrane — the semipermeable membrane that separates the fetal from the maternal blood in the placenta. In the human (hemochorial) placenta, it is composed of fetal vascular endothelium, connective tissue, cytotrophoblast, and syncytiotrophoblast, and it… … Medical dictionary
barrier — noun Etymology: Middle English barrere, from Anglo French, from barre bar Date: 14th century 1. a. something material that blocks or is intended to block passage < highway barriers > < a … New Collegiate Dictionary
Placenta — For the ancient Roman bread, see placenta (food). For the placenta of fruit, see placentation. Placenta Placenta Precursor … Wikipedia
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
Immune tolerance in pregnancy — or gestational/maternal immune tolerance is the absence of a maternal immune response against the fetus and placenta, which thus may be viewed as unusually successful allografts, since they genetically differ from the mother.[1] In the same way,… … Wikipedia
drug — drug1 /drug/, n., v., drugged, drugging. n. 1. Pharm. a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well being. 2. (in federal law) a. any substance… … Universalium
Drug — /droog/, n. Zoroastrianism. the cosmic principle of disorder and falsehood. Cf. Asha. [ < Avestan drauga] * * * I Any chemical agent that affects the function of living things. Some, including antibiotics, stimulants, tranquilizers,… … Universalium