Objective To assay the concentration of neurotrophic factors secreted by human schwann cells that were cultured in vitro and to observe the time-concentration relationship.
目的测定体外培养的人雪旺氏细胞分泌神经营养因子在各时间点的浓度并观察其时间-浓度关系。
Buenos Aires was born and grew with a close relationship to its role as a port, which would become, in time, a point of commercial and communication ways concentration.
布宜诺斯艾利斯出生和长大，与密切的关系，以发挥其作为一个港口，这将成为，假以时日，而这一点对商业和通讯方式浓度。
The radioactive concentration of lesion pixel depended on the pixel counts, the acquisition time and CF, and the relationship was expressed with an empirical formula.
②由图像像素的累积计数、 采集 时间及定标系数确定像素的放射性浓度 ，其关系可以一经验公式表示。
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