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.
Nanotechnology, which is sometimes shortened to , refers to a field whose theme is the control of matter on an atomic and scale. Generally nanotechnology deals with structures 100 or smaller, and involves developing materials or devices within that size.