Once the bacteria stick to the enamel, they trigger a process called demineralisation - they turn sugar in the diet into a harmful acid that starts to create holes in the teeth.
The fact that copper pollution of laccaic acid in stick lac could not be avoided was concluded after considering its biological source and chemical nature.
从紫胶的生物来源和紫胶红色素的化学本质分析，紫胶原胶中紫胶红色素的铜污染是不可避免的。
3
The components of starch, fat, amino acid and ash were determined to analyzed nutrient components of iron stick yam and bubil.