[Research advance in allelopathy effect and mechanism of terrestrial plants in inhibition of Microcystis aeruginosa.] / é™†ç”Ÿæ¤ç‰©åŒ–æ„ŸæŠ‘åˆ¶é“œç»¿å¾®å›Šè—»ä½œç”¨æ•ˆåº”åŠæœºåˆ¶ç ”ç©¶è¿›å±•.

The inhibition of algae reproduction and control of harmful algal bloom are the primary challenges in the ecological restoration of eutrophicated water. It is urgent to inhibit algae over-reproduction in green and effective ways, one of which is the use of plant allelopathic effect. How-ever, few study focused on allelochemicals of terrestrial plants. Here, we introduced inhibition of Microcystis aeruginosa over-reproduction by allelochemicals from three categories of terrestrial plants, including herbaceous plants (Compositae/Papaveraceae, Liliaceae, Graminaceae), woody plants, and Chinese medicine plants. The classification, separation and identification of alleloche-micals from terrestrial plants that could be used for the inhibition of M. aeruginosa were summarized. Finally, the allelopathic mechanism to inhibit M. aeruginosa was discussed in detail to support the development of algistat. We also proposed some suggestions for the further development of algistat.

Inhaled formaldehyde induces bone marrow toxicity via oxidative stress in exposed mice.

Formaldehyde (FA) is an economically important chemical, and has been found to cause various types of toxic damage to the body. Formaldehyde-induced toxic damage involves reactive oxygen species (ROS) that trigger subsequent toxic effects and inflammatory responses, which may increase risk of cancer. Therefore, in the present study, we aimed to investigate the possible toxic mechanism in bone marrow caused by formaldehyde. In accordance with the principle of randomization, the mice were divided into four groups of 6 mice per group. One group was exposed to ambient air and the other three groups were exposed to different concentrations of formaldehyde (20, 40, 80 mg/m3) for 15 days in the respective inhalation chambers, 2h a day. At the end of the 15-day experimental period, all mice were killed. Bone marrow cells were obtained. Some of those were used for the determination of blood cell numbers, bone marrow karyote numbers, CFU-F, superoxide dismutase (SOD) activity and malondialdehyde (MDA) content; others were used for the determination of mitochondrial membrane potential (MMP), cell cycle and Bcl-2, Bax, CytC protein expression. WBC and PLT numbers in median and high dose groups were obvious reduced, but there was no change on RBC numbers. There was also reduced numbers of bone marrow karyotes and CFU-F in the high dose group. SOD activity was decreased, but MDA content was increased. MMP and Bcl-2 expression were decreased with increasing formaldehyde concentration, while expression of Bax and Cyt C was increased. We also observed change in cell cycling, and found that there was S phase arrest in the high dose group. Our study suggested that a certain concentration of formaldehyde could have toxic effects on the hematopoietic system, with oxidative stress as a critical effect.