some science question in english 100分!之后在追加100分!

来源:百度知道 编辑:UC知道 时间:2024/06/20 16:39:15
1. Why is there a world food crisis?
2. What is chlorpyrifos?
3. What are the advantages/disadvantages of using chlorpyrifos? (each has to have 3 answer and prove it)
4. How is the use of chlorpyrifos an economic issue?
5. How is the use of chlorpyrifos?
6. Is the use of chlorpyrifos a good or a bad idea?

我们科学在做这些..现在我们在写有关这个的作文..要求 1000个英文单词以上2500个以下.. 要bibliography.. 而且不能引用超过500个单词的copy!
大哥要英文啊..

Chlorpyrifos is a toxic organophosphate insecticide that is used to control insect pests and are used for killing insects in a range of products including sheep dip.

It works by inhibiting the enzyme acetylcholinesterase. This enzyme is essential as a neurotransmitter, chemicals that interfere with the action of cholinesterase are potent neurotoxins, causing excessive salivation and eye watering in low doses, followed by muscle spasms and ultimately death (examples are snake venom, sarin and VX).
The oral LD50 for chlorpyrifos in rats is 95 to 270 mg/kg. The LD50 for chlorpyrifos is 60 mg/kg in mice, 1000 mg/kg in rabbits, 32 mg/kg in chickens, 500 to 504 mg/kg in guinea pigs, and 800 mg/kg in sheep.

How it Works:
Chlorpyrifos and other insecticide OPs are inhibitors of acetylcholinesterase (ACh-ase) as are also carbamates, which is an enzyme vital to the nervous systems of animals and humans. The transmission of impulses across certain nerve juncti