PKA

PKA, pK_a, or other similar variations may stand for:

Look up pka in Wiktionary, the free dictionary.

• pK_a, the symbol for the acid dissociation constant at logarithmic scale
• Protein kinase A, a class of cAMP-dependent enzymes
• Pi Kappa Alpha, the North-American social fraternity
• Public key authentication, establishing key authenticity in public-key cryptography
• Professional Karate Association
• Primary knock-on atom
• Professionally known as
• Russian Federal Space Agency (РКА)