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'that': [49], 'reflect': [50], 'U.S.': [51], 'production': [52, 128], 'rates.': [53], 'design': [55], 'organic': [56], 'loading': [57], 'rate': [58], '3.1': [60], 'kg': [61], 'volatile': [62, 142, 165, 213], 'solids/m3/day': [63], 'the': [65, 79, 84, 87, 104, 108, 137, 151, 159, 180, 209, 224, 229, 277, 291], 'retention': [66], 'time': [67], '20': [69], 'days.': [70], 'Ribosomal': [71], 'RNA-targeted': [72], 'oligonucleotide': [73], 'probes': [74], 'determine': [78], 'methanogenic': [80, 205], 'community': [81], 'structure': [82], 'inocula': [85], 'digesters.': [88], 'Chemical': [89], 'analyses': [90], 'performed': [92], 'evaluate': [94], 'digester': [95, 153, 182], 'performance.': [96], 'successful': [102], 'for': [103], 'reactor,': [106], 'despite': [107], 'use': [109], 'inoculum.': [113], 'After': [114, 175], 'short': [116], 'period': [118, 211], '(20': [119], 'days),': [120], 'stable': [121], 'performance': [122, 198], 'observed': [124, 203], 'high': [126, 132], 'gas': [127], 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