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.
There are many different views of precisely what is included in nanotechnology. 1  In general , however, most agree that three things are important: 2  Small size, measured in 100s of nanometers or less. 3  Unique properties because of the small size. 4  Control the structure and composition on the nm scale in order to control the properties.