Obese people have been shown to have a higher proportion of Bacteria from the Firmicutes division and a lower proportion of bacteria from the Bacteroidetes division in their gut.

• 第一部分为筛选具有益生菌特性的乳酸菌，以提供肠道保健及当做第二部分的穿梭载体系统之宿主。第二部分为筛选一内源性的乳酸菌质体及其序列分析。