官厅水库蓝绿藻及藻毒素初步研究

聚苹果酸最初是由微生物学家在研究青霉菌的过程中发现的,聚苹果酸的人工合成由逐步聚合法开始，但由于苹果酸单体具有3种功能基，因此得到的是支化的聚苹果酸,随后人们改用苄酯基保护一端羧基的苹果酸单体，以DCC为缩合剂，进行缩聚，但这种方法只能得到聚苹果酸低聚物。

Synthesis and Characterization of 4-(2-Benzyloxy-ethoxycarbonyl)-2-oxetanone

This is the first report of the algal toxins of water bloom in Guanting Reservoir of Beijing. The algal compositions and one family of their toxins-microcystins were investigated. The dominant species in the blooms found in September of 2003 were Microcystis, whose ratio to the number of total algal cells reach 97.2%. The specific species of the microcystis in the bloom included microcystis aeruginosa(52.7%), microcystis wesenbergii(36.2%) and Microcystis pseudofilamentasa(8.3%). The qualitative analysis by HPLC shows that at least five microcystins were contained in the scum of the blooms. The major microcystins were microcystin-RR and microcystin-LR. The quantitative analysis by HPLC indicates that the blooms contained microcystin-RR 1.69 mg/g and microcystin-LR 1.44 mg/g dried sample. The other three microcystins would be studied later.