测定时间

Mature and immature embryos of maize inbred line 87-1 were used as explants and calli were induced and cultured on improved N6 medium. The method of enzyme-linked immunosorbant assay was employed to detect endogenous contents of abscisic acid, indoleacetic acid, gibberellins (GA3) and cytokinins of immature, mature embryos and their calli during culture process.

以玉米自交系87-1的幼胚和成熟胚为材料，采用酶联免疫法测定了不同培养时间诱导的幼胚及成熟胚愈伤组织内源脱落酸、吲哚乙酸、赤霉素(GA3)和细胞分裂素含量的动态变化。

The methods of enzyme-linked immunosorbant assay were employed to detect endogenous contents of abscisic acid, indoleacetic acid, gibberellins (GA3, GA4) and cytokinins of immature embryos, embryonic and non-embryonic calli during culture process.

酶联免疫法测定不同培养时间后未成熟胚，以及由此诱导的胚性和非胚性愈伤组织，内源脱落酸、吲哚乙酸、赤霉素(GA3、GA4)和细胞分裂素(DHZR、IPA、ZR)含量。

For decades, archaeologists have used a technique called carbon dating to work out how old their finds are.

几十年来，考古学家已经用名为碳年代测定的方法计算出他们所发现文物的时间。

For example, heart muscle cells have two nuclei, which means the DNA could be in there twice, so this could screw up the carbon 14 dating.

例如，心肌细胞有两个核意味着DNA可能在那里出现两次，增大了测定C14体内时间的难度。

So if the old theory that we die with the heart cells we are born with is true, then people born before carbon 14 got into the food chain (nuclear testing didn't start until 1955) wouldn't have any carbon 14 in their heart cells.

如果根据心肌细胞不可再生理论，那么在C14进入食物链之前（1955年核试验开始前）出生的人心肌细胞内不会有C14，但事实并非如此，这些人的心肌细胞不仅含有C14，研究者还测定出了C14存在体内的时间。

Methods The experimental mice were given tested sample14days with dose400,800and1600mg/kg BW separately,at the15th day,the rate of Indian ink advancing in small intestine,the time of the first black feces excretion,the granules of feces and the weight of feces were measured.

目的 探讨低聚果糖通便的效果方法分别以400.0、800.0、1600.0mg/kg BW剂量的低聚果糖连续给小鼠灌胃14天，并于第15天进行小肠运动实验和排便时间、粪便粒和粪便重量的测定。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。