Isolasi kapang selulolitik dan karakterisasi selulosa mikrokristal dari eceng gondok (Eichornia crassipes) hasil hidrolisis enzimatis selulase = Isolation of cellulolytic fungi and characterization of microcrystalline cellulose from water hyacinth (Eichornia crassipes) by using cellulase enzymatic hydrolisis method / Hasti Ristina Sari