“Hans C. J. Gram” ba kalma ba ce a cikin ƙamus, amma sunan mutum ne. Hans Christian Joachim Gram (1853-1938) kwararre ne akan kwayoyin cuta dan kasar Denmark wanda ya kirkiri tabon Gram, wata dabarar dakin gwaje-gwaje da ake amfani da ita don bambance nau'in kwayoyin cuta zuwa nau'i biyu: gram-positive da gram-negative. Wannan hanyar tabo ta zama kayan aiki mai mahimmanci a cikin ƙwayoyin cuta da kuma binciken likita.