The first step is to look into the rats' brains and figure out what neurons in that
cubic millimeter are actually doing.
For example, it has been estimated that if we were to use sections of about 35 square micrometers (millionths of a meter) at a thickness of 20 nanometers, we would need more than 1.4bn sections to reconstruct fully just one
cubic millimeter of tissue.
The Harvard researchers stored 5.5 petabits, or 1 million gigabits, per
cubic millimeter in the DNA storage medium.
Normally the range of CD4 T helper cell count in healthy individual is 500 to 1500 cells per
cubic millimeter of blood, whereas in infected individual these cells count declines and falls below 500 cells per
cubic millimeter of blood and when it continues to decrease below 200 cells per
cubic millimeter; acquired immunodeficiency syndrome commonly occur.
That study enrolled 1,763 serodiscordant couples and showed that early ART therapy - given when CD4 counts were between 350 and 550 cells per
cubic millimeter - reduced HIV transmission to an uninfected partner by 96% (N.
Laboratory examination revealed a white blood cell count of 11.5 per
cubic millimeter, hematocrit of 35%, and platelet count of 395,000 cells/cubic millimeters.
If one were to apply the same manual approach to the far denser circuitry of the human cortex, Seung tells us, it would take a million person-years just to map a
cubic millimeter.
The Fraunhofer microcameras are also smaller than conventional microcameras--about 1
cubic millimeter, or about the size of a grain of sand.
All participants had a CD4+ count of more than 200 and less than 350 per
cubic millimeter of blood.