An element is a pure substance that is made from a single type of atom. Elements are the building blocks for all the rest of the matter in the world. Examples of elements include iron, oxygen, hydrogen, gold, and helium.
Since the initial discovery that the adult brain contains stem cells that generate new neurons, an important question in neurobiology has been whether or not this adult neurogenesis is functionally important.
Kauferâs lab focused on neural stem cells in the hippocampus of the brains of adult rats under acute or chronic stress. These stem cells were previously thought to mature only into neurons or a type of glial cell called an astrocyte.However, the researchers found that chronic stress made stem cells in the hippocampus mature into another type of glial cell called an oligodendrocyte, which produces the myelin that sheaths nerve cells.hronic stress decreases the number of stem cells that mature into neurons and might provide an explanation for how chronic stress also affects learning and memory, according to the researchers. âUsually the brain doesnât make much oligodendrocytes in adulthood from those neural stem cells,â according to Kaufer.