Fig. 4

Effects of carrier treatment methods on diatom culture. Method A: Ulva powder and M-f/2 culture medium were sterilized separately at 121 °C for 30 min.. Method B: Ulva powder and M-f/2 culture medium were mixed and then sterilized at 121 °C for 30 min. Method C: Ulva powder was added to sterilized M-f/2 culture medium after drying at 80 °C