Tissue adhesives play a role in temporary or permanent tissue repair, wound management, and the attachment of wearable electronics. However, it can be challenging to tailor the adhesive strength to ensure reversibility when desired and to maintain permeability. Ma et al. designed hydrogels made of polyacrylamide or poly(N-isopropylacrylamide) combined with alginate that are primed using a solution containing nanoparticles of chitosan, gelatin, or cellulose nanocrystals. The application of ultrasound causes cavitation that pushes the primer molecules into the tissue. The mechanical interlocking of the anchors eventually results in strong adhesion between hydrogel and tissue without the need for chemical bonding. Tests on porcine or rat skin showed enhanced adhesion energy and interfacial fatigue resistance with on-demand detachment.
生物学Biology
Inpidual tracking reveals long-distance flight-path control in a nocturnally migrating moth
个体追踪揭示夜间迁徙飞蛾的长距离飞行路径控制
作者：MYLES H. M. MENZ, MARTINA SCACCO, HANS-MARTIN BURKI-SPYCHER, HANNAH J. WILLIAMS, DON R. REYNOLDS, JASON W. CHAPMAN, AND MARTIN WIKELSKI
链接：
https://www.science.org/doi/10.1126/science.abn1663
摘要：
人们对于迁徙物种长距离跋涉如何导航仍然知之甚少。对无脊椎动物来说尤其如此，相关监测具有挑战性。然而，新技术带来了极其轻的、安装在动物身上的标签，为这一领域的研究开辟了新的途径作者使用这种标签来跟踪在欧洲和撒哈拉以南非洲之间迁徙的一种鹰蛾的飞行。
他们发现，即使面对破坏性的风和高山，飞蛾也能纠正自己的特定路线。这项研究表明，飞蛾不仅仅是被动地朝正确的方向移动，而是根据内部地图或指南针主动导航。
Abstract：
We still know little about how many migrating species navigate across vast distances. This is especially true for invertebrates, which are challenging to monitor. However, new technologies leading to extremely light, animal-mounted tags are opening up new research avenues in this area. Menz et al. used such tags to track the flight of death’s-head hawkmoths that migrate between Europe and sub-Saharan Africa. They found that the moths were able to correct to their specific course even in the face of disruptive winds and high mountains. This work suggests that the moths are not merely passively moving in the right direction, but instead actively navigating based on an internal map or compass.
