stem cells :: essays research papers

After a typical delivery the umbilical cord cord cord and the bank line within it is discarded. Now researchers have discovered that this inception contains valuable halt kiosks which can be used in the interposition of several blood disorders. Stem cells ar simply un ruined cells that develop into platelets or red and white blood cells. Stem cells will sustain to produce blood cells for an indefinite period of time after transplantation. Until the baring of stem cells in umbilical cord blood and placentas, bone nerve center stem cells were the primary means available to those in need of a transplant. The harvesting process for bone vegetable marrow stem cells involves anesthesia, and major operating theater with a collection time of up to four hours. Cord blood stem cells can be harvested directly from the already detached umbilical cord and placenta in about five minutes, with no pain, anesthesia, or persevering risk. There are two types of cells used in stem cell tra nsplantation. Haemopoietic stem cells come from umbilical cord blood. Bone marrow stem cells are known as autologous. Stem cell transplants are necessary after a patient has undergone a radical treatment such as chemotherapy. While these treatments destroy unhealthy cancerous cells, they in like manner destroy otherwise healthy cells that are needed to maintain a strong immune system. Stem cells from cord blood transplants typically pass away for one of two reasons. The first occurs if chemotherapy fails to kill the pre-existing tumor, and the second if the newly introduced graft becomes infiltrated with tumor cells. Stem cells from umbilical cord blood do have a few downsides. First, the available collectable volume is non typically enough to reestablish an adult immune system. Most adults and one-time(a) children are non suitable for cord blood transplantation. Also, there is not enough blood to create a reserve in guinea pig of unsuccessful engraftment. Only small amounts of blood can be obtained from umbilical cords, so recipients are traditionally children who require fewer stem cells than adults. unmatchable advantage of cord blood is that it does contain significant numbers of stem cells that can be stored indefinitely. It also poses no medical risks to the donor, and has a miserable graft-versus-host-disease (GVHD) threat even when combined with a non-matched donor. Minority children stand to master the most benefits from umbilical cord blood (UCB) because there is such a small reserve of donated minority blood and exact matches arent of all time necessary with cord blood.