The nuclear membrane, sometimes referred to as the nuclear envelope, is the membrane that encloses the nucleus. This bilayer membrane is made of lipids, and encases the genetic material in eukaryotic cells. The nuclear membrane is made up of a double lipid bilayer. There are two parts to these two layers: the inner and the outer nuclear membrane. There is a space between the membranes, which is called the perinuclear space. This 20-40 nm wide section of the membrane isconnected with the inside of the endoplasmic reticulum.
DRUG CLASS AND MECHANISM: Propoxyphene is a narcotic pain-reliever and cough suppressant but is weaker than morphine, codeine, and hydrocodone. The precise mechanism of action is not known but may involve stimulation of opioid (narcotic) receptors in the brain.
(November 2009). Aprepitant (brand name: Emend (the brand name used in all English-speaking countries)) is an antiemetic chemical compound that belongs to a class of drugs called substance P antagonists (SPA). It mediates its effect by blocking the neurokinin 1 (NK 1) receptor.