Soft composite hydrogel objects formed from the biopolymer sodium alginate, the enzyme urease, and oil droplets are formed by a simple gelation procedure to produce autonomous bodies with both time and spatial programming. These continuous objects of non-uniform dimensional composition selectively respond to an environmental stimulus of urea and change colour or disintegrate at pre-defined locations within the hydrogel structure after pre-set time intervals. The spatial and temporal responses of these hydrogels to an environmental stimulus are valuable tools in areas such as soft robotics.

中文翻译：

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软复合水凝胶物体的时空编程

由生物聚合物海藻酸钠，酶脲酶和油滴形成的软复合水凝胶物体可通过简单的胶凝过程形成，从而通过时间和空间编程产生自主体。这些不均匀尺寸组成的连续物体在预设的时间间隔后选择性响应尿素的环境刺激并在水凝胶结构内的预定位置改变颜色或崩解。这些水凝胶对环境刺激的时空响应在诸如软机器人等领域是有价值的工具。