Manibat 1877 anggang 1879, mituldu ya king Imperial Health Office (German: Kaiserliches Gesundheitsamt) king Berlin, nung nu ne meging assistant Robert Koch. King usuk o abisu nang Angelina Hesse, ing asawa ning aliwang assistant a mibait New York, i Walther Hesse, inumpisan ning laboratoryung Koch ing pamagpatubung bacteria kareng agar plate. Kaybat, inimbentu neng Petri ing standard culture dish, o Petri plate, at lalu ne pang inalkus (further developed) ing kaparalanan ning pamagpatubu king agar culture ba lang gawang puru at parakalan deng kolonyang bacteria a ibat kareng magdili-diling selula (single cells). Uli na ning panyulung a iti, meging posibling kilalanan la king masusing peralan deng bacteriang panibatan da reng sakit.