Seniors and Depression: The difference between depression and dementia. Depression is a mood disorder; dementias like Alzheimerâs disease, can have similar symptoms but they are different illnesses and have different treatment plans.
From a synthesis standpoint, nanotechnologies can be classified as variations of bottom-up technologies, such as self-assembly, or top-down technologies, such as lithographic methods (Box 1). Many nanotechnologies combine aspects of both strategies.
The Dangers of Nanotech. In the growing field of nanotechnology, engineers are creating countless new microscopic materials. They're used in thousands of consumer goods, from cell phones to cosmetics and sunscreen.