Ke Ji Ri Bao
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科技日报:武汉双柳长江大桥主跨首片钢箱梁成功吊装
Ke Ji Ri Bao· 2025-06-18 08:31
Core Viewpoint - The successful installation of the first steel box girder for the Wuhan Shuangliu Yangtze River Bridge marks a significant advancement in the construction of this major infrastructure project, which is part of the national expressway network and aims to enhance regional connectivity and logistics efficiency [1][3]. Group 1: Project Overview - The Wuhan Shuangliu Yangtze River Bridge is a key component of the G9906 Wuhan metropolitan area ring road, with a total length of 35.04 kilometers and a main span of 1430 meters, designed for a speed of 120 km/h and featuring an 8-lane dual carriageway [1]. - The bridge will be the widest steel box girder suspension bridge on the Yangtze River and is referred to as the "first bridge" of Wuhan's eastern gateway [1]. Group 2: Technical Details - The main span consists of 90 girder segments, with the first installed segment measuring 13.0 meters in length, 50.5 meters in width, and 4 meters in height, weighing approximately 298.6 tons [3]. - To ensure safety during the large-scale lifting operation, the project team implemented a detailed planning process, including the design modification of the cable crane and conducting pre-lift tests with a 455-ton steel box girder [3]. Group 3: Impact on Regional Development - Upon completion, the bridge will reduce the travel time from Xinzhou to Ezhou from one and a half hours to just five minutes, facilitating the integration of the Wuhan metropolitan area [4]. - The project will also create a fast transport corridor connecting Yangluo International Port to Ezhou Huahu Airport and the Wuhan National Aerospace Industry Base, enhancing the logistics hub functionality and promoting the integration of "Optics Valley" and "Star Valley" [4].
树蛙家族再添新物种
Ke Ji Ri Bao· 2025-06-18 03:16
Core Findings - A new species of tree frog named "Motuo Tree Frog" has been discovered in Motuo County, Tibet, by a collaborative research team from various institutions [1][2] - The research was published in the international journal "Animal Systematics and Evolution" [1] Research Methodology - The research team conducted in-depth investigations in the mountainous areas of Motuo County, at altitudes ranging from 500 to 1700 meters [1] - Initial identification categorized the frogs as known species, but detailed morphological comparisons and molecular phylogenetic analyses revealed their true identity as a new species [1] Species Characteristics - The Motuo Tree Frog has a medium body size, with adult lengths ranging from 31.6 mm to 55.5 mm [1] - Distinctive features include a reddish-brown or gray-green back, unique skin protrusions at the tip of the snout, black spots on the sides, and prominent triangular skin folds at the ankle joints [1] Significance of Findings - The study highlights significant morphological and genetic differences between the Motuo Tree Frog and the previously known Two-spotted Tree Frog [2] - The research reevaluated the geographical distribution of the Two-spotted Tree Frog, confirming its range is limited to northern India and central-western Myanmar, contrary to previous beliefs of a broader Southeast Asian distribution [2] - The discovery contributes to the understanding of amphibian diversity and evolution in the Himalayas, providing essential data for biodiversity conservation policies in Tibet [2]
打开遗传“黑箱” 解开百年谜题——研究人员揭示孟德尔豌豆三大性状变异关键基因
Ke Ji Ri Bao· 2025-06-18 03:01
Core Insights - The research team led by Cheng Shifeng from the Shenzhen Agricultural Genomics Institute has successfully constructed high-resolution haplotype and phenotype variation maps for peas, revealing the genetic basis behind Mendel's seven traits for the first time at the molecular level [1][5][6] - This study represents a significant scientific dialogue with Mendel's work from 1865, where he first proposed the theory of hereditary factors controlling traits through pea hybridization experiments [1][4] Group 1: Research Background - Cheng Shifeng's team aimed to solve the remaining mysteries of Mendel's seven traits, focusing on the genetic mechanisms of legume nodulation and nitrogen fixation [3][5] - The team collected approximately 700 pea core germplasm samples from 41 countries across six continents, which were planted in various experimental bases in China for phenotype recording [3][5] Group 2: Key Findings - The team discovered that the key to the difference between green and yellow pods is not a gene mutation but a large genomic segment deletion of about 100kb, affecting the transcription process of chlorophyll synthase genes [5][6] - Two independent but functionally related genes control the fullness and wrinkled state of pods, representing highly conserved developmental regulatory networks in plants [6] - The flower position trait, the most complex among Mendel's seven traits, is controlled by the Fa gene, with the research revealing unexpected genetic modifiers that can alter the expected phenotype [6][9] Group 3: Additional Discoveries - The research provided deeper insights into plant color genetics, revealing that the yellow and green seed differences arise from functional mutations in the chlorophyll degradation pathway [8] - A new genetic modifier, Mfa, was identified, which can suppress the expression of the main effect gene Fa, leading to variations in flower positioning despite the presence of the fa mutation [9]
【科技日报】植物褪黑素:兼具促进生长与安全防护功能
Ke Ji Ri Bao· 2025-06-18 00:54
Core Insights - Melatonin in plants plays a dual role as both a growth promoter and a stress inducer, enhancing crop yield under optimal conditions while providing resistance against environmental stressors [2][4] - The discovery of the melatonin receptor PMTR1 has opened new avenues for understanding plant defense signaling and its rapid response mechanisms [4] Group 1: Melatonin's Role in Plants - Melatonin regulates plant growth by promoting root development and leaf expansion through the cytokinin signaling pathway, maximizing yield in suitable environments [2] - Under stress conditions such as drought or salinity, melatonin levels increase, activating heat shock proteins and antioxidant enzyme systems, thereby enhancing plant resilience [2] - For instance, in rice, exogenous application of melatonin can increase root length by 40% and improve photosynthetic efficiency by 35% under saline conditions, challenging the traditional notion that high yield and stress resistance are mutually exclusive [2] Group 2: Melatonin Synthesis Pathway - The synthesis pathway of plant melatonin is complex, involving multiple cellular compartments such as the endoplasmic reticulum, chloroplasts, mitochondria, and cytoplasm, allowing precise regulation of melatonin levels under varying growth conditions [3] - During drought stress, the expression of melatonin synthesis genes in chloroplasts is significantly upregulated, enabling plants to initiate local stress response programs [3] Group 3: PMTR1 Receptor and Defense Mechanisms - The PMTR1 receptor activates intracellular signaling pathways, including reactive oxygen species and calcium ion signaling, triggering a rapid defense response within five minutes of pathogen invasion or extreme temperature exposure [4] - PMTR1 exhibits a dose-dependent regulatory feature, promoting stomatal opening at low melatonin concentrations for optimal photosynthesis, while closing stomata at higher concentrations to mitigate drought stress [4] - The potential application of melatonin in organic agriculture is significant, as it can be precisely regulated through gene editing, leading to the development of "smart crops" and reducing chemical pesticide usage by over 70% [4]
我科研人员破译高等植物转录因子功能分化密码
Ke Ji Ri Bao· 2025-06-18 00:42
Core Viewpoint - The research team led by Professor Zhu Fangjie from Fujian Agriculture and Forestry University has decoded the functional differentiation of MYB family transcription factors, providing new insights into the "specificity paradox" in higher plant research, which may accelerate the application of grass in new energy and materials [1][2]. Group 1: Research Findings - The study analyzed the DNA sequence specificity of 40 MYB family transcription factors, revealing a new mechanism for functional differentiation among transcription factors that originated from a common ancestor [1][2]. - The research identified key MYB factors that regulate cellulose synthesis in grass, which is crucial for its agronomic traits and production performance [2]. Group 2: Implications for Industry - The findings are expected to enhance the application of grass in the fields of new energy and new materials, particularly as biomass materials [2]. - The research integrates basic scientific research with industrial transformation, leveraging the advantages of the Straits Joint Research Institute and the National Grass Engineering Technology Research Center [2].
国内资本市场绿色功能显著增强
Ke Ji Ri Bao· 2025-06-18 00:42
Group 1 - The core viewpoint is that China's climate investment and financing efforts are significantly increasing, enhancing the green functions of the capital market [1][2] - By the end of 2024, the balance of green loans in China is expected to reach 36.6 trillion yuan, a year-on-year increase of 21.7%, which is 14.5 percentage points higher than the growth rate of other loans [1] - The green bond market is showing strong growth, with over 4 trillion yuan in cumulative green bonds issued, including innovative products like carbon-neutral bonds and transition bonds [1] Group 2 - China's central enterprises are actively exploring new models and mechanisms for climate investment and financing, contributing to the green low-carbon future industry [2] - The National Development Investment Corporation has established a 5 billion yuan new energy industry investment fund, focusing on renewable energy and environmental protection sectors [2] - These innovative practices not only inject new momentum into the development of central enterprises but also provide valuable references for the green low-carbon transformation of the entire economy [2]
哈尔滨工业大学:院士给本科生当导师
Ke Ji Ri Bao· 2025-06-18 00:42
Core Points - Harbin Institute of Technology (HIT) is establishing a new elite program called "尖班" (Top Class) aimed at nurturing innovative talents with the involvement of academicians as mentors [1][4] - The program allows students to enter based on their college entrance examination scores, expanding access beyond the previous "dual selection" method [2] - HIT has introduced a new "Autonomous Intelligent Systems Academician Class," focusing on cutting-edge research in artificial intelligence and related fields [4] Group 1 - The "尖班" program is designed to cultivate top innovative talents and is supported by a team of over ten academicians, including the university president [1] - The curriculum breaks traditional structures, emphasizing a talent cultivation system that integrates mathematical and physical foundations with interdisciplinary approaches [1] - Students in the program can choose their academic paths from undergraduate to doctoral levels, promoting personalized development [2] Group 2 - HIT encourages undergraduate students to engage in research related to their doctoral theses, allowing them to complete their undergraduate projects early and join academic teams [2] - The "哈工大—港大优学班" (HIT-HKU Elite Class) is also being launched, enabling students to complete their undergraduate studies in three years and pursue advanced degrees at the University of Hong Kong [4] - Over the past five years, HIT graduates have shown a high employment rate in key sectors, with nearly 40% securing jobs in central enterprises and Fortune 500 companies [4]
西安交通大学:“十大计划”培养拔尖人才
Ke Ji Ri Bao· 2025-06-18 00:42
Group 1 - In 2025, Xi'an Jiaotong University plans to enroll 6,350 students, an increase of 200 from 2024, focusing on fields such as artificial intelligence, information technology, and intelligent manufacturing [1] - The university will implement a "small big category" enrollment model with 27 categories covering 61 first-class national majors, ensuring maximum satisfaction of candidates' preferences [1] - Special policies are in place for certain programs, such as "no report, no adjustment" for medical-related majors and a separate admission plan for nursing, reducing uncertainty for applicants [1] Group 2 - Xi'an Jiaotong University has established a unique "Ten Major Plans" for cultivating top talents, including the "Zhu Feng Plan" led by Nobel laureates and academicians, focusing on cutting-edge fields like particle physics and quantum information [2] - The university will introduce two new strong foundation programs in mathematics (intelligent science) and energy and power engineering (gas turbines and aircraft engines) in 2025, aligning with national strategic needs [2] - The year 2025 is designated as the "Artificial Intelligence Empowerment Year," promoting the integration of AI into education, with a comprehensive AI professional system and 87 "smart courses" across all disciplines [2] Group 3 - The university has a policy for major transfers that allows students to apply without limits, with ample slots for transfer into specialized classes like the Qian Xuesen Class and AI Class [4] - Students in their senior year can participate in projects at the university's Innovation Port, collaborating with 241 leading companies, including 56 Fortune 500 companies, to bridge classroom learning with real-world research [4]
中山大学:新增双学士学位项目
Ke Ji Ri Bao· 2025-06-18 00:42
Core Viewpoint - Sun Yat-sen University is expanding its undergraduate enrollment plan to 7,845 students in 2025, focusing on interdisciplinary studies and innovative talent cultivation to meet national and regional development needs [1][2]. Enrollment Expansion - The university will maintain its enrollment of over 500 students from Hong Kong, Macau, and Taiwan, emphasizing its role as a leader in higher education within the Guangdong-Hong Kong-Macau Greater Bay Area [1]. - The new enrollment plan will target emerging interdisciplinary fields, national shortage disciplines, and dual degree programs to cultivate top innovative talents [1]. New Programs and Initiatives - In 2025, the university will introduce new majors in Pharmacy (Biomedicine) and Mathematics and Applied Mathematics (Intelligent Science), bringing the total to 12 strong foundation programs [2]. - Three new undergraduate programs in Flexible Electronics, Smart Agriculture, and Digital Economy will be added to develop high-quality talents with a combination of knowledge and practical skills [2]. - The university will launch seven distinctive "Innovation Classes" across various fields, providing tailored growth pathways and support for students [2]. Dual Degree Programs - Ten new dual degree programs will be introduced, focusing on interdisciplinary integration and addressing national strategic needs, with a total enrollment plan of 210 students [2]. - The dual degree programs will feature a unique curriculum structure, requiring students to complete a thesis that integrates both disciplines, resulting in two degrees upon graduation [4]. Admission Policies - The university will continue its established admission practices, ensuring that students are admitted to their chosen departments without adjustments or rejections, maximizing the fulfillment of student preferences [4]. - Opportunities for cross-disciplinary studies and flexible learning paths will be available to students, enhancing their educational experience [4].
南京大学:组建新工科“至诚班”
Ke Ji Ri Bao· 2025-06-18 00:42
Group 1 - Nanjing University aims to provide the best undergraduate education in China, launching initiatives to cultivate top innovative talents [1] - The university has established a new Robotics and Automation College at its Suzhou campus, introducing a major in Automation (Robotics Direction) focused on smart manufacturing and robotics technology [1] - The "Zhicheng Class" is introduced to strengthen practical training and industry-education integration, featuring a talent cultivation system driven by industry needs and deep involvement from central enterprises [1] Group 2 - In 2025, Nanjing University will add "Intelligent Science" and "Electronic Science" directions to its Mathematics and Physics programs, respectively [2] - The Kuang Yaming College will continue to reform its outstanding talent cultivation model, allowing students to freely choose their academic paths and mentors, with over 80% of graduates pursuing further studies at prestigious institutions [2] - New dual-degree programs in Software Engineering combined with Business Management and Economics will be introduced to foster interdisciplinary talents [3] Group 3 - The university will continue to offer various dual-degree programs, including Computer Finance, German Law, Intelligent System Integration, and Big Data Communication, to provide students with ample choices and development opportunities [3]