Single-molecule fluorescence experiments involve the study of individual fluorescent molecules, and can provide information that would be hidden in measurements involving a large number of molecules.

Welcome to Smithsonian Open Access, where you can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to ...

A force is a push or a pull. For example, when you push open a door you must apply a force to the door. You also must apply a force to pull open a drawer. You cannot see a force but often you can see ...

Abstract: As a critical factor in diagnostic work-up and treatment decision-making process of sleep-related breathing disorders, accurate localization of obstructive sites in the upper airway is in ...

Revised 3.2. Measurement of TC, LDL-C, HDL-C, TG, and Non–HDL-C COR 2a: For adults with an LDL-C level <70 mg/dL (<1.8 mmol/L), measurement of direct LDL-C or modified LDL-C estimate is reasonable to ...