PG One

1

Objective : Porphyromonas gingivalis ( Pg ) is one of the main putative pathogens of periodontal disease , especially of adult periodontitis .

目的：探讨牙周炎主要病原菌牙龈卟啉单胞菌（Pg）对常用抗菌药物的敏感性。
2

[ Objective ] Streptococcus sanguis ( Ss ) is one of the most popular bacteria in the oral cavity , which associates with various diseases . Porphyromonas gingivalis ( Pg ) is one kind of anaerobic gram-negative bacteria associated with the chronic periodontitis .

[目的]血链球菌（Ss）是一种与许多疾病相关的口腔中最常见的细菌，牙龈卟啉单胞菌（Pg）是一种与慢性牙周疾病相关的革兰氏阴性的厌氧菌。
3

Prostaglandin ( PG ) D_2 is one of unsaturated fatty acids with 20 carbon atoms , which is synthesized by PGD synthase ( PGDS ) in the brain .

前列腺素D2（PGD2）是由前列腺素D2合成酶合成的一种二十碳不饱和脂肪酸。