“The proton is a positively charged particle that is one of the building blocks of an atomic nucleus.”

“This indicates that the bound azide is required to detect the 410-nm signal and suggests that azide plays the role of the proton acceptor.”

“Why is it easier to accelerate an electron to a speed that is close to the speed of light, compared to accelerating a proton to the same speed?”

“This implies that chromophore protonation precedes the exposure of hydrophobic surface.”

“The protonation state of the catalytic aspartates was determined theoretically.”

“The rate constants of protonation of these reactants had been measured previously by manual analysis and their pK values are directly measured.”

“Weak acids have dissociable protons like strong acids, but they simply do not dissociate completely.”

“The protons and neutrons in the nucleus are made of elementary particles called quarks.”

“Yet experiments indicated that quarks within protons were only loosely bound together.”