以“What to do protech the environment”为题写一篇英语文章,谈谈你对环境保护

honlang1402022-10-04 11:39:541条回答

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文怡怡然 共回答了19个问题 | 采纳率94.7%
What is the zebra camouflage role?To humans,it’s hard to imagine that the stripes act as camouflage.Zoologists believe stripes offer zebras protection from predators in a couple of different ways.The first is as simple pattern-camouflage,much like the type the military uses in its fatigue design.The wavy lines of a zebra blend in with the wavy lines of the tall grass around it.It doesn’t matter that the zebra’s stripes are black and white and the lines Domestic cleaner of the grass are yellow,brown or green,because the zebra’s main predator,the lion,is colorblind.The pattern of the camouflage is much more important than its color,when hiding from these predators.
1年前

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PeproTech公司的重组人细胞因子IFN-γ 20ug,相关参考文献最终浓度是500U/ml.要如何换算及稀释,万谢
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产品说明书上是这么写的,
Biological activity:The ED50 was determined by a viral resistance assay is =2*10^7 units/mg.
公司主页上边是这么写的,
Biological Activity :
Determined by its ability to induce apoptosis in HeLa cells.The expected ED50 for this effect is 5.0-10.0 ng/ml
我现在需要的浓度是500U/ml,要稀释成多少毫升才合适呢?
现在货已到,就是不敢去做随便稀释!
oo雄霸1年前1
landy009 共回答了18个问题 | 采纳率94.4%
按照说明书上说的做吧,人家都帮你算好了.
抗病毒活性1mg相当于2*10^7 U,如果你需要500U/ml,那么能稀释到800ml.
建议先配个母液,比如稀释到0.8ml,用前再根据需要稀释.
sun protechtion sunny day是干什么的
xiaohua26011年前1
心存** 共回答了20个问题 | 采纳率85%
您的问题很简单.百度知道很高兴帮助您解决您提出的问题.
原句:sun protechtion sunny day正确拼写:sun protection sunny day
翻译:晴天专业防晒
Sun Protection:日晒防护 ;防晒 ;专业防晒
sunny day:晴天
百度知道永远给您最专业的英语翻译.