Increased levels of brown fat may also be attributed to an increase in a brain chemical called brain-derived neurotrophic factor [BDNF] found in the sociable mice.

在社会性的小鼠大脑中发现，褐色脂肪的增加可能还归因于大脑中的一种化学物质，称为脑源性神经营养因子。

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The micro -scale construction of these materials is a key factor though, so chemical engineers must understand what is happening at the microscopic level.

而这些材料的微观结构是一个关键性因素，所以化学工程师必须在微观的层次上了解发生的一切。

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Two or three channels imprinted onto the plastic square contain either a normal cell growth medium or a chemical under study, such as growth factor.

印在塑料方块上的两、三条通道通常包含一个正常的细胞生长介质或者研究中的化学物质如生长因子。

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