ðə lˈæɾɚ pɹˈɑːsɛs ɪz kˈɔːld ɐsˈɪmɪlətˌoːɹi sˈʌlfeɪt ɹᵻdˈʌkʃən bɪkˈʌz ðə sˈʌlfeɪt sˈʌlfɜːɹ ɪz ɐsˈɪmᵻlˌeɪɾᵻd.
The latter process is called assimilatory sulfate reduction because the sulfate sulfur is assimilated.