来源：央视财经 防弹衣 吴奇解释，其实"炒冷饭"的答案不在灶台上，而在米饭的微观结构里。他表示，刚煮好的米饭，淀粉分 子处于松散状态，冷却后，淀粉链之间会形成更多氢键，就像一张渔网被加密了，网格变小、结构更紧 实，米粒因此变得"坚挺"。正因如此，冷饭下锅后不易糊化、粘连，更容易炒出粒粒分明、干香可口的 效果。 撒贝宁幽默地总结："你以为你炒的是饭？其实你调控的是分子链之间的距离！"而这，仅仅是厨房科学 的冰山一角。为什么拉面越拉越筋道？为什么和面要反复揉搓？这些日常操作，其实都涉及高分子链的 延展、纠缠与重组，属于大分子物理学的研究范畴。甚至看似毫不相关的古籍修复，也离不开对纸张纤 维等大分子材料各项性能的理解。 保鲜膜和 相信大家一定听过不少厨房里的"小妙招"：蛋炒饭要用冷米饭、饺子馅要朝一个方向搅拌、爽滑的肠粉 则非陈米不可……这些代代相传的经验，看似只是生活智慧，但实际上暗藏着食物中淀粉、蛋白质这些 大分子变化的科学规律。 本期《开讲啦》邀请到一位潜入厨房的"分子侦探"——中国科学院院士、大分子物理学家吴奇，他不执 锅铲，却以大分子物理学的"编织术"为钥匙，带领观众揭开一道道家常美味背后的科学密码，开启 ...

保鲜膜，基本上家家都会用到，当天没吃完的菜、新鲜切开的水果……它不仅能防止食物串味，还能减 少空气中的氧气与食物接触，延缓食物氧化和腐败过程。 然而，如果保鲜膜没用对，会对人体健康产生很多危害。《生命时报》综合多位专家观点，总结保鲜膜 的使用误区，并给出正确用法。 这样用保鲜膜，释放有害物质 北京化工大学材料科学与工程学院教授丁雪佳表示，保鲜膜一般分为聚乙烯（PE）、聚氯乙烯 （PVC）、聚偏二氯乙烯（PVDC）这三类。 江苏省消保委提醒，有的保鲜膜无法承受高温，如果用此类保鲜膜裹着食物直接加热，可能会产生有毒 有害物质。 丁雪佳表示，邻苯二甲酸酯，也就是常说的增塑剂（塑化剂），被应用于玩具、食品包装、洗护用品、 医疗器具等产品中。 1 聚乙烯（PE） 这类保鲜膜不含增塑剂、安全性高，但其热稳定性和抗拉伸性相对较弱，适合用于保存新鲜蔬果、冷冻 食品等，应避免加热。 2 聚氯乙烯（PVC） 此类保鲜膜透明度高、延展性好，但含有增塑剂（塑化剂），高温下或接触油脂性食物时可能会释放有 害物质，可用于日常保鲜，但不宜用来包裹肉类、熟食、热食等，更不能高温加热。 它在常温下可挥发至空气中，遇油脂类食物或高温时迁移量相对 ...

低密度聚乙烯因其柔软的质地和高弹性，使其在薄膜制品领域占据主导地位，生产出的保鲜膜、农用薄 膜等产品，不仅柔韧性佳，还具备良好的防潮、防氧化性能；而优异的透明性，让其成为食品包装、化 妆品包装的理想选择，既能清晰展示产品，又能有效保护内容物。据统计，截至2024年我国低密度聚乙 烯产量为369.03万吨，表观需求量为610.34万吨。 近年来，我国低密度聚乙烯的生产能力和产量稳步发展，但仍产不足需，加上产品同质化现象较为严 重，高档产品无法满足国内实际生产需求，故每年还得大量进口。据统计，截至2024年我国低密度聚乙 烯进口量为295.62万吨，同比下降4.04%，进口均价为8388.81元/吨，同比增长0.94%；2024年出口量为 24.31万吨，同比增长2.82%，出口均价为10749.62元/吨，同比下降5.26%。 从我国低密度聚乙烯进口来源国进口量分布来看，2024年我国共从56个国家和地区进口低密度聚乙烯， 其中进口量排前六的分别是伊朗、阿联酋、美国、沙特阿拉伯、韩国与卡塔尔，前六地区进口量合计占 比77.83%，其他地区进口量占比22.17%。 市场规模来看，2021-2023年我国低密度聚乙 ...

Group 1 - The core point of the article is that all 35 batches of non-composite film bag products inspected in Shenyang, Liaoning Province, were found to be qualified [3][4][5]. Group 2 - The inspection results indicate that various manufacturers in Shenyang produced compliant products, including polyethylene and polypropylene films, with specifications such as 590×0.055 mm and 400×700×0.03 mm [4][5][6]. - The inspection was conducted by the Shenyang Market Supervision Administration, highlighting the regulatory efforts to ensure product quality in the packaging industry [3][4].

Core Viewpoint - Reynolds Consumer Products (REYN), a manufacturer of kitchen consumables such as aluminum foil, cling film, and garbage bags, saw a 4% increase in its stock price following its selection for inclusion in the S&P SmallCap 600 Index, effective September 24, reflecting the company's strong market performance [1]. Group 1 - Reynolds Consumer Products was selected for inclusion in the S&P SmallCap 600 Index [1]. - The inclusion is set to take effect on September 24 [1]. - The stock price of Reynolds Consumer Products increased by 4% in early trading [1].

Group 1 - The article discusses the viral video claiming that China has a shortage of garbage for incineration, which has led to public excitement about producing more waste without guilt [1][7][11] - As of 2023, China has built over 1,000 waste incineration power plants, with a total incineration capacity exceeding that of the US, Japan, and Europe combined [20][11] - The public's perception of waste management is influenced by the efficiency and profitability of incineration, leading to misconceptions about the role of waste sorting and recycling [7][8][9] Group 2 - The current waste generation in major cities like Beijing and Shanghai is significantly high, with estimates of over 200 kg and 290 kg per person per year, respectively [11][12] - The overcapacity of incineration plants is a result of insufficient landfill space, prompting the construction of more incineration facilities [14][12] - The article emphasizes that incineration is not a comprehensive solution to waste management, as it generates greenhouse gases and does not address the root causes of waste production [22][47] Group 3 - Concerns about dioxin emissions from incineration are raised, highlighting that while technology has improved, monitoring and regulation are still inadequate [15][16][17] - The article points out that the current monitoring practices for dioxin emissions are not as frequent or effective as necessary, leading to potential environmental and health risks [16][18] - The discussion includes the need for stricter regulations and better management of waste incineration to ensure public health and environmental safety [18][47] Group 4 - The article advocates for a shift from incineration to waste reduction and recycling, emphasizing the importance of source reduction in waste management strategies [55][57] - It highlights the role of individuals and businesses in reducing waste, suggesting practices like reusing materials and minimizing single-use plastics [55][57] - The need for systemic changes in waste management policies and practices is emphasized, including higher costs for waste production to reflect the true social costs [48][54]

Core Viewpoint - The Urumqi Municipal Market Supervision Bureau is actively implementing a quality safety inspection action for food-related products, focusing on ensuring the safety and quality of items closely related to daily life, such as disposable plastic tableware and food packaging materials [1] Group 1: Inspection Focus - The inspection targets disposable plastic tableware, paper cups, food packaging bags, and cling film, which are essential for daily life [1] - The bureau emphasizes strict checks on production sources and circulation links, ensuring the quality safety of food-related products [1] Group 2: Regulatory Measures - Inspectors are verifying that labels on products clearly indicate the product name, standards, manufacturer details, and production license numbers [1] - The bureau is urging sales units to implement strict incoming inspection systems to ensure traceability of product sources [1] Group 3: Future Actions - The bureau plans to conduct regular quality supervision and follow-up on problematic enterprises to ensure compliance and rectify issues [1] - There will be a focus on publicizing food safety knowledge to enhance the public's ability to identify counterfeit products, making regulation more transparent and aligned with community needs [1]

Group 1: Foreign Trade Activity - The activity level of foreign trade entities in China has increased significantly this year, with a notable rise in the "new content" of foreign trade [1] - During the "May Day" holiday, the Suifenhe port experienced a peak in cargo traffic, with 353 trucks crossing the border on May 1, indicating robust border trade activity [1] - Suifenhe Customs has opened fast lanes for perishable goods and hazardous materials to facilitate efficient cross-border cargo transport [1] Group 2: Export Growth - In the first three months of this year, Suifenhe's export scale exceeded 3.8 billion yuan, marking a 45% year-on-year increase [2] - The Deqing County government has established a "3+1+N" mechanism involving government, enterprises, and banks to support companies in expanding overseas [2] - The Zhejiang Longhu Forging Co., Ltd. anticipates that its export sales to Europe will account for 45% of its total exports this year, reflecting a strategic market shift initiated in 2018 [2] Group 3: Trade Events and Market Expansion - An external trade exhibition was held in Haining, featuring nearly 50 foreign trade companies aiming to expand their domestic and international markets [2] - The company Keling Plastic (Zhejiang) Co., Ltd. exports 60% of its products overseas and seeks to optimize its foreign trade structure through participation in the trade exhibition [2] - The Pinghu Shangzhu Sports Goods Co., Ltd. has received increased orders from U.S. clients, indicating strong market demand despite tariffs, with a significant market share in the U.S. hunting apparel sector [3]