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。
2
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。
3
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.