Abstract: A hand warmer charging case includes an accommodating housing and an accommodating cover. The accommodating housing is provided with a storage space for storing a target hand warmer. The accommodating housing is further provided with an accommodating space. The accommodating space is configured to accommodate a rechargeable power supply and a circuit board matched with the rechargeable power supply. The accommodating cover is movably connected to the accommodating housing in a movable manner, and is configured to close or open the storage space. During use, the accommodating cover that cooperates with the accommodating housing is opened to opening the storage space provided in the accommodating housing. A power bank hand warmer that needs to be charged or is temporarily in idle is put into the storage space, and the accommodating cover that cooperates with the accommodating housing is closed, thereby closing the storage space provided in the accommodating housing.

Abstract: The invention provides a surface, wherein said surface comprises (i) a polymer substrate and (ii) sugar groups and peptide groups coupled to said substrate suitable for culturing hepatocytes.

Abstract: Provided are an in-vitro cell colony culture device and use thereof, the in-vitro cell colony culture device comprising: a micro-patterned template having a micro-patterned cavity, and adhesive hydrogel formed on the lower surface of the micro-patterned template, and the micro-patterned cavity defining the growth space of the cell colony. An upper template can be retained or removed as required to from a monolayer cell micro-pattern or a multiplayer cell micro-cluster.

Abstract: The ability to rapidly generate concentration gradients of diffusible molecules has important applications in many chemical and biological studies. The present invention is directed to methods and systems for generating spatially and temporally controllable concentration gradients of molecules (i.e. proteins or toxins) in a portable microfluidic device. The formation of the concentration gradients can be initiated by an induced forward flow and further optimized during an induced backward flow. The forward and backward flows can be either passively induced and/or actively pumped. The centimeter-length gradients along the microfluidic channel can be spatially and temporally controlled by the backward flow. The gradient profile was stabilized by stopping the flow.

Abstract: The invention provides a surface, wherein said surface comprises (i) a polymer substrate and (ii) sugar groups and peptide groups coupled to said substrate suitable for culturing hepatocytes.