这次旅行，洪欣颖还专程到重庆观音桥商圈北城天街逛街，选购了一个城市限定款马克杯，参观了一场艺术主题展。“潮流文化是许多年轻人的喜好。我们通过定期更新街区布景、推出特色活动，让游客每次来都有新奇感。”北城天街运营经理周成兴说。
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It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.