IQela le-HQC Elisekwe phantse iminyaka engama-30, liqela lekhemikhali elichwephesha elisebenza kwii-agent ze-biological buffering, imathiriyeli ekrwada yezithambiso, iikhemikhali zombane, izicatshulwa zezityalo kunye neemveliso zemichiza ezilungileyo.
Funda ngokugqithisileyo