Lateral flow control swabs are used to check that the test is working properly and should not be used for patient testing.

Regulator genes may control the synthesis of specific enzymes by a negative control system which prevents gene expression in the absence of inducer or by a positive control system which requires both ...

The Federal Railroad Administration has called positive train control the “single-most important rail safety development in more than a century.” So why don’t we have it everywhere?

With three fatal train accidents in recent weeks, there's been a cry for Positive Train Control, a system that will automatically stop trains before certain types of accidents can happen. WIlliam ...