THE QUALITATIVE ANALYSIS OF A TWO SPECIES AMENSALISM MODEL WITH NON-MONOTONIC FUNCTIONAL RESPONSE AND ALLEE EFFECT ON SECOND SPECIES

In this paper, we present a two species amensalism model with non-monotonic functional response and Allee effect on second species. Local and global stability of the boundary and interior equilibrium are investigated. By introducing the Allee effect, we show that the boundary equilibrium have changed from unstable node and saddle into saddle-node. Also, the system subject to an Allee effect has increased the time of reach to its stable steady-state solution, but has no influence on the final density of the two species. Our results are supported by numeric simulations.

三七菊花速溶粉毒理学安全性评价

目的:对以三七、菊花、乳糖等为原料生产的三七菊花速溶粉进行毒理学安全性评价。方法:用小鼠急性经口毒性试验、Ames试验、小鼠骨髓细胞微核试验、小鼠精子畸形试验、大鼠30 d喂养试验等。结果:经口急性毒性试验LD50>21.50g/kg.bw,属无毒级;Ames试验、小鼠骨髓嗜多染性红细胞微核试验和小鼠精子畸形三项遗传毒性试验检测均为阴性结果;30d喂养试验末期各项血液学指标、生化指标检测结果和肝、肾、脾、及生殖腺脏器系数值与阴性对照组无明显差异。大鼠体重变化、食物利用率正常,病理组织学观察结果表明肝、肾、胃、十二指肠及卵巢和睾丸均未见明显异常。传统致畸试验未见对胎鼠致畸效应或其它胚胎毒性作用。结论:三七菊花速溶粉对动物的生长发育、造血功能、肝肾功能、器官组织均无明显毒性作用。