科技日报北京6月15日电 （记者马爱平）记者15日从国家粮食和物资储备局获悉，截至目前，全国 已累计收购夏粮小麦超1700万吨，收购工作开局良好，进展顺利。 今年新麦上市以来，我国多元主体积极入市，有效保障了小麦收购价格的平稳运行。国家有关部门 已在河南省启动了小麦最低收购价执行预案，小麦价格的政策底部已经明朗。"政策利好消息发布后， 对市场的提振作用明显，主产区小麦价格止跌企稳，河南省部分加工企业收购价上涨10元/吨。市场价 格预期稳定，多元主体收购新麦积极性较前期显著提升。"向玉旭说，"从已收获情况看，市场普遍反映 今年新麦质量好，蛋白、面筋含量高。有企业反映，新麦多项质量指标为近年来最好。" 政策性和市场性因素将持续支撑后期麦价走势。"在政策利好、品质良好、进口减少等因素的共同 作用下，我国经营主体心态好转。"国家粮食和物资储备数据中心研究员曹雨然表示，当前小麦市场价 格底部明确，部分中间商已经开始考虑建立库存头寸。由于新麦品质好，储备库轮入采购也在加快推 进。此外，今年以来谷物进口同比减少较多，对国内小麦市场形成了有力支撑。 "近期对部分产区新季小麦开展了质量监测，结果显示质量整体好于常年。目前全国新 ...

原标题：细菌饿急了会先吃"邻居"？ 科学家是如何发现这一点的呢？他们使用时间延迟摄影、基因编辑和化学标记等技术，"亲眼目睹"了这 个过程的发生。无论是海洋细菌，还是人类肠道中的微生物，当它们在营养稀缺的环境中生存时，那些 拥有T6SS的细菌会主动攻击邻居，吸收"死者"释放出的内部物质作为营养，从而达到生存目的。 科学家还专门设计了一组实验，通过基因工程关闭了某些细菌的T6SS功能。结果发现，在缺乏营养的 环境下，这些"手无寸铁"的细菌根本无法生长；而同样条件下，那些保留T6SS的细菌却茁壮成长。这 说明，它们的生存确实依赖于"谋杀并进食"。 令人震惊的是，这样的"细菌捕食"行为并非实验室里的特例。科学家分析了全球海洋中不同环境的细菌 基因数据，发现类似的武器系统广泛存在。 也就是说，只要资源一旦紧缺，有些细菌就会"变脸"。 试想一下，如果科学家能控制这些细菌"武器"的开关机制，或许可以制造出会主动攻击有害细菌的"智 能益生菌"。又或许，科学家还能借助类似T6SS的结构，开发出能精准将药物注射进病菌体内的新型抗 生素。 更广泛地讲，在自然界中，这种机制甚至可能影响整个碳循环。细菌在海洋中负责分解藻类、回收碳， ...

Core Insights - The article highlights the achievements of the Quzhou Technology Courtyard team from China Agricultural University, which has significantly contributed to agricultural innovation and green development in Quzhou County, Hebei Province [2][3][4] Group 1: Team Achievements - The Quzhou Technology Courtyard team has developed and promoted 37 high-yield and efficient agricultural technologies over the past 16 years, increasing the adoption rate of these technologies from 17.9% to 53.5% between 2009 and 2014 [4] - The team was awarded the 2025 China Youth May Fourth Medal Collective, with 90% of its 122 members being under 35 years old, emphasizing the youth-driven approach to agricultural innovation [2][3] Group 2: Agricultural Practices - The team introduced the "Water-Nitrogen Postponement" technique, which reduced irrigation from four times to two, resulting in wheat yields exceeding 650 kg per mu, thus saving costs and improving productivity [3] - The "Green Ton Half Grain" initiative aims to achieve an annual yield of 1.5 tons per mu while reducing emissions by over 30%, with the 2024 demonstration bases already achieving a yield of 1.52 tons per mu, surpassing the county average by 42% [6] Group 3: Community Engagement - The Quzhou Technology Courtyard team engages closely with local farmers, providing hands-on training and support, which has led to the training of over 80,000 farmers and the cultivation of more than 1,000 "soil experts" and rural leaders [8] - The team has established 16 technology courtyards, allowing farmers to consult freely and receive immediate assistance, thereby bridging the gap between research and practical agricultural needs [3][5]

Core Viewpoint - The establishment of the Wu Mengchao Academy aims to promote the spirit of the renowned Chinese liver surgeon, emphasizing the importance of clinical service over mere academic achievements [1][4]. Group 1: Wu Mengchao's Contributions - Wu Mengchao is recognized as the "Father of Chinese Liver Surgery" and has made significant contributions to the field, including leading a team that achieved numerous medical firsts and breakthroughs [2]. - The academy showcases 15 major medical achievements by Wu Mengchao, including the world record for the largest liver tumor resection, with a specimen weighing 18 kilograms [2]. Group 2: Educational Initiatives - The academy features interactive exhibits, including a handprint area where visitors can engage with Wu Mengchao's legacy, symbolizing their role as spiritual successors [3]. - A digital representation of Wu Mengchao allows visitors to engage in conversations, fostering a connection between past and present medical practitioners [3][4]. Group 3: Legacy and Recognition - Wu Mengchao is the first recipient of a named asteroid in the field of medicine in China, symbolizing his 76 years of dedication to healthcare [4]. - The establishment of the academy serves as a lasting tribute to Wu Mengchao's life and work, setting a spiritual benchmark for future generations of medical professionals [4][5].

原标题："干得好不好，企业说了算" 此外，松绑减负还体现在不增加额外管理负担等方面。曾有科研人员向记者抱怨，自己受聘于企 业，工作之余要填写工作日志，年底还要接受考核检查，耗费了不少精力。出发点虽好，但无形中给科 研人员增加了负担。 鼓励科研人员深入企业一线，要处理好管理与服务的关系。遵循这一思路，宁夏科技厅此次特地简 化程序，组织开发自治区科创专员选聘工作网络版服务平台，全面推行申报无纸化，实现选聘工作全流 程信息化。 当前，企业科技创新能力弱是宁夏产业创新发展的突出短板。企业普遍面临科技人才短缺、创新效 能不高等问题，通过让科研人员"下沉"一线等举措提升核心竞争力，迫在眉睫。 首批科创专员来自宁夏大学、宁夏农林科学院等8家区内高校院所，以及山东大学、西安交通大 学、中国水产科学研究院、苏州英诺欣医药科技有限公司等25家区外单位。 宁夏此次改革的关键，在于既要激励科研人员深入企业"摸爬滚打"，又要避免给他们造成额外负 担，实现二者的平衡。 记者翻阅选聘管理办法时注意到，支持政策规定"对于选聘的科创专员，通过自治区人才经费每年 给予2万元生活补助"，这与常见的科技项目经费截然不同。 "传统模式下，科研人员花的 ...

科技日报讯 （记者刘霞）美国科罗拉多大学博尔德分校开展的最新研究表明，广泛应用于食品添 加剂的赤藓糖醇，可能对脑血管健康产生不利影响。这项发表于《应用生理学杂志》的研究发现，这种 代糖会引发多重负面效应：加剧氧化应激、干扰一氧化氮信号传导、促进血管收缩肽生成，并削弱脑部 微血管内皮细胞的溶栓能力。 赤藓糖醇甜度为蔗糖的60%—80%，却几乎不含热量，已成为蛋白棒、低卡饮料和糖尿病特制食品 中的常用添加剂。然而随着研究深入，科学家发现其"甜美"外表下可能暗藏隐忧：欧美多项流行病学调 查显示，血液中赤藓糖醇浓度升高与心脑血管疾病发生率存在正相关。 团队表示，当前结论源自实验室条件下的急性暴露实验，实际人体长期摄入的影响仍需通过更深入 的动物实验和临床研究予以验证。 在最新研究中，团队设计了精密的体外实验。他们将培养的人脑微血管内皮细胞暴露于相当于一瓶 饮料含量的赤藓糖醇中，并通过毛细管电泳免疫测定和酶联免疫吸附测定等技术，测量了细胞的氧化应 激、抗氧化蛋白表达、一氧化氮生物利用度、内皮素产生和血栓溶解能力。 结果显示，暴露于赤藓糖醇的血管细胞，其氧化应激水平激增加了75%，虽触发抗氧化防御机制 ——超氧化物歧化酶 ...

Core Insights - The theme of the 2025 Cultural and Natural Heritage Day is "Revitalizing Cultural Relics and Shining New Light," emphasizing the role of technological innovation in the high-quality development of cultural relics [1] - The integration of advanced technologies, such as isotopes and radiation techniques, is becoming increasingly important for the protection and research of cultural heritage [1][2] Group 1: Technological Advancements - The establishment of the "National Key Research Base for Nuclear Technology Applications in Cultural Relics" by the Chinese Academy of Sciences aims to develop a nuclear technology research platform for cultural relics [1] - Synchrotron radiation is described as a "super microscope" that allows for observation at the molecular and atomic levels, aiding in the understanding of cultural and natural heritage [1] - Neutron imaging technology can provide detailed internal structures of cultural relics without causing damage, offering superior penetration compared to traditional X-rays [2] Group 2: Collaborative Research - Collaboration between the research team and the Palace Museum has led to significant findings, such as the internal corrosion composition of a Western Han lacquered iron book knife, revealing new insights into the relic's deterioration [2] - The development of specialized equipment, such as high-energy CT and micro-CT, allows for high-resolution imaging of both large and small cultural relics, showcasing the innovative applications of technology in this field [3] Group 3: Future Prospects - The advancements in technology are expected to enhance the protection and transmission of cultural heritage, allowing historical culture to shine in the new era [3]

Core Insights - A research team from the University of California, Davis has developed a brain-computer interface (BCI) that may help individuals with speech loss due to neurological diseases regain their ability to "speak" [1][2] - This technology translates brain activity into speech in real-time, creating a "digital vocal cord" that allows for more natural communication compared to previous systems that only converted neural activity into text [1][2] Technology Overview - The new BCI system consists of four microelectrode arrays implanted in the brain's speech-generating area, which record neuronal activity when the participant attempts to speak [1] - The system decodes these signals and reconstructs speech output, enabling the participant to control pitch and express different emotions or intentions [1][2] - The speed of this technology is remarkable, with a delay of only 1/40 of a second from neural signal acquisition to speech synthesis, comparable to the time it takes for individuals to hear their own voice while speaking [1] Performance Metrics - Participants can also "sing" short melodies, demonstrating the flexibility of the speech synthesis [2] - The intelligibility of the synthesized speech reached nearly 60%, a significant improvement compared to only about 4% intelligibility without the system [2] Future Implications - This research marks a significant advancement in BCI technology for restoring natural language capabilities, offering new hope for individuals who have lost their ability to speak due to illness or injury [2] - The technology has the potential for broader applications among patients, pushing the field of neural prosthetics towards more intelligent and human-centered solutions [2]

Core Insights - The rise of Labubu, a Chinese toy brand, highlights the potential of emotional consumption and cultural resonance, marking a shift from "Made in China" to "Created in China" [2][3] Group 1: Cultural and Technological Innovation - Cultural elements provide the soul for IP, with Chinese toy companies leveraging traditional culture and global expressions to create appealing products like Labubu [3] - Technological advancements enable IP upgrades, with companies reducing mold development time and increasing production capacity significantly through digital modeling and smart manufacturing [3] Group 2: Industry Support and Market Trends - The complete industrial chain in Dongguan supports the realization of IP, facilitating design, production, and logistics, which has allowed local brands to capitalize on popular IPs [3] - In 2023, the value of original IP in Dongguan surpassed that of OEM business, accounting for 53% of the market, indicating a significant shift towards innovation despite the fast-changing trends in consumer preferences [3][4]

Core Viewpoint - Researchers from South China Agricultural University and Henan University of Science and Technology have discovered a new mechanism for selenium transport in rice, providing a theoretical basis for increasing the selenium content in rice and guiding the development of new selenium-rich rice varieties [1][2]. Group 1: Selenium's Importance and Current Challenges - Selenium is an essential trace element for humans, playing a crucial role in enhancing immunity, antioxidant activity, and cancer prevention. A lack of selenium can lead to various health issues, including heart disease and cancer [1]. - Approximately 700 million people in China live in selenium-deficient or low-selenium areas, posing a potential risk for insufficient selenium intake [1]. - Rice, a staple food for half of the global population, generally has low selenium content, primarily in the form of selenomethionine, which is less efficiently absorbed by the human body compared to methylselenocysteine, a more bioavailable form of selenium found in vegetables like broccoli and garlic [1]. Group 2: Research Findings - The study identified a transport protein named NRT1.1B in rice, which functions as a "selenium courier," transporting high-quality selenium from the roots to the stems and leaves during the growth period, and back to the roots for temporary storage [2]. - During the grain-filling stage, this transport protein plays a critical role in efficiently delivering high-quality selenium from the roots and leaves to the developing grains [2]. - The goal of the research is to ensure that every grain of rice can better meet human selenium needs, with plans to further develop these findings into products that provide rice rich in methylselenocysteine [2].