Group 1 - The stock price of Zhenghai Biological as of August 26, 2025, closed at 22.23 yuan, down 0.22 yuan or 0.98% from the previous trading day [1] - The trading volume on that day was 33,418 hands, with a transaction amount of 0.75 billion yuan and a turnover rate of 1.86% [1] - Zhenghai Biological operates in the medical device sector, focusing on the research, production, and sales of biological regenerative materials, including oral repair membranes and biological membranes [1] Group 2 - The company announced that its calcium silicate bioceramic bone repair material is a non-animal-derived synthetic bone repair material, which will be subject to a 13% value-added tax upon market launch [1] - Zhenghai Biological clarified that there are currently no plans to develop non-animal-derived meningeal series products [1] - A temporary shareholders' meeting is scheduled for August 27 to review multiple proposals, including changes to the business scope and amendments to the company’s articles of association [1] Group 3 - On August 26, the net outflow of main funds was 2.4205 million yuan, with a cumulative net outflow of 21.9957 million yuan over the past five days [1]

Core Insights - A new study from MIT reveals that bacterial biofilms play a crucial role in determining the accumulation of microplastics in riverbeds, making them more susceptible to being washed away by water flow [1][2] - The presence of biofilms reduces the space available for microplastics to embed within sand particles, thus increasing their exposure to water flow and facilitating their removal [2] Group 1 - Microplastics are increasingly concerning due to their accumulation in the environment and human bodies, complicating pollution management efforts [1] - The study published in "Geophysical Research Letters" highlights that biofilms are key factors influencing microplastic distribution and sedimentation [1] - The research utilized a flume experiment to simulate conditions affecting microplastic behavior, demonstrating the impact of biofilms on microplastic accumulation [1][2] Group 2 - The study identified two phenomena affecting microplastic accumulation: turbulence around simulated root systems hinders sedimentation, while increased biofilm content reduces microplastic accumulation [2] - Biofilms fill the gaps between sand particles, making it difficult for microplastics to embed and thus more likely to be carried away by water flow [2] - The researchers suggest that monitoring efforts should focus on sandy outer regions of mangrove ecosystems, where microplastics are likely to accumulate due to lower biofilm presence [2]