An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Helmerson, K.
, Kishore, R.
, Phillips, W.
and Weetall, H.
(1997),
Optical Tweezers-Based Immunosensor Detects Femtomolar Concentrations of Antigens, Clinical Chemistry
(Accessed April 19, 2024)