Ichi chigadzirwa chakanyatsogadzirirwa uye chakagadzirirwa kuchengetedza kwenguva refu yezvakasiyana biological chigadzirwa, kusanganisira mavhairasi, germs.erythrocytes, leukocytes uye cutis. Zvikumbiro zvinogona kuwanikwa mumabhangi eropa, zvipatara, masevhisi ekudzivirira denda, uye masangano ekutsvagisa, marabhoritari mumagetsi nemakemikari zvidyarwa. bio-logical engineering masangano uye hove dzemugungwamakambani.