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Professor Yiliang Li and his collaborator were conducting fieldwork to identify and recommend potential landing sites for the upcoming Chinese Mars Sample Return mission.

HKU Astrobiologist Joins National Effort to Map Out China’s Tianwen-3 Mars Sample Return Mission

The origin of life is one of the most fundamental and enduring questions of mankind and one of the three greatest Origin Questions in the natural sciences.  Recently, China has officially launched its Mars Sample Return (MSR) mission, Tianwen-3, marking a significant step forward in planetary exploration. The mission aims to bring Martian samples back to Earth, where advanced laboratory instruments will be employed to conduct comprehensive analyses, seeking to determine whether life ever existed—or may still exist—on Mars. Professor Yiliang LI, an astrobiologist from the Department of Earth Sciences at The University of Hong Kong (HKU), serves as a core member of the Tianwen-3 scientific team and a co-author of a recently published perspective article in Nature Astronomy outlining the mission’s objectives. His role mainly involves leading an HKU group that is working on the selection of the landing site for the Tianwen-3 MSR mission. Schematic of the Chinese Mars Sample Return mission, where the lander will drill 2 metres deep to collect the samples and scoop the surface materials with a robotic arm and drone. Is There Life on Mars? Earth is the only planet we know that harbours life. Research traces the origin of life on Earth dates back to approximately 3.8 billion years ago, around 700 million years after the formation of our solar system. Drawing on theoretical, experimental, and observational approaches, scientists believe that Earth's evolution during its first 700 million years made it a planet capable of producing life and being habitable. However, definitive evidence is still lacking as to whether life on Earth arose solely through indigenous evolution. Like Earth, Mars lies within the habitable zone of our solar system. Research suggests that Mars once had a dense atmosphere and a warm, moist climate early in its history, making it suitable for the emergence and development of microbial life. From an astrobiological perspective, the early Martian environment was conducive to the survival of many of the so-called extremophiles found on Earth. The Mission: Bringing Mars to Earth The key to China's MSR mission lies in identifying Martian materials most likely to preserve evidence of past or present life. To achieve this, Chinese scientists must conduct extensive research before launching the rockets. This includes searching for regions on Mars where liquid water was likely present in the planet’s early history, areas rich in essential metallic nutrients, and sites where traces of Martian microbial activity could potentially be preserved for billions of years. While this article outlines the fundamental framework for these studies, the search for promising sampling sites on Mars remains an ongoing and active endeavour. The MSR mission, scheduled for launch in 2028, involves two separate rockets: 1. A lander, which will land on the Martian surface to collect samples. 2. An orbiter, which will wait in Mars’ orbit to receive the samples and bring them back to Earth. The lander will drill 2 metres underground—a critical depth because the surface of Mars is bombarded with radiation and corrosive chemicals that can destroy any signs of past or present life. Below this hostile surface layer, valuable organic materials may still be preserved. The samples will be transferred to the orbiter and then flown back to Earth for detailed analysis using sophisticated instruments not available on Mars. The roadmap of the Chinese Mars Sample Return mission, which will be launched in 2028. Advancing Planetary Exploration Frontiers The article further highlights that the greatest challenge in returning Mars samples to Earth lies not in the formidable technical or scientific obstacles, but in quarantining and monitoring required once these extraterrestrial materials arrive—a process known as planetary protection. As China is poised to become the first country to return potentially biologically active planetary material, including potential life forms, from beyond Earth, the potential risk such substances might pose to terrestrial life, including humans, is a major concern. To address this, China plans to construct a specialised facility on the outskirts of Hefei, its renowned scientific hub, where Martian samples will undergo comprehensive biochemical and pathological testing under strict isolation from the Earth’s environment. Only after it is conclusively determined that the samples contain no active biological agents or substances that could threaten the Earth’s biosphere will they be released to designated laboratories for in-depth scientific analysis. China's upcoming Mars sample return mission represents the next research goal following the successful deployment of the Zhurong rover on Mars in 2021. With this achievement, China became the second country—after the United States—to successfully land and operate a rover on the Martian surface. In 2020, several countries and entities announced ambitious goals for close-up and in-situ exploration of Mars by around 2030. Ultimately, only China's plan has made significant progress and been realised thus far. The Tianwen mission is China's national effort to explore Mars through interplanetary space missions. The rover Zhurong, depicted in the image, became China's first rover to successfully land on the Martian surface in 2021. The Team Behind Tianwen-3 The article was co-authored by leading experts at the forefront of China’s planetary exploration efforts: •           Liu Jizhong – Chief Engineer of Tianwen-3, Deputy Director of the Science and Technology Committee for Large Space Projects, and Chief Designer of China’s heavy-lift rocket programme. •           Hou Zengqian – Academician and Chief Scientist of Tianwen-3 and China’s National Planetary Exploration Programme, former Vice President of the National Natural Science Foundation of China, and Scientist at the Chinese Academy of Geological Sciences. •           Wang Yuming – Deputy head of the Space Science and Ground Application Demonstration Group for the Tianwen-3 Mars Sample Return Mission. He is also the Deputy Director of the National Key Laboratory for Deep Space Exploration and Professor at the University of Science and Technology of China. He previously led the development of Mars magnetometers and comparative planetary science centres. The perspective article in Nature Astronomy can be accessed via this link.   

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The gold neon dwarf goby (Stiphodon percnopterygionus) is one of many diadromous species affected by dam-induced habitat fragmentation. Image credit: Jeffery C.F. Chan

HKU Ecologists Lead Global Study Revealing Dam Construction's Harmful Impact on Migratory River Species

A global review of research on the impacts of dams has revealed that they are significantly harmful to diadromous species – fish, crustaceans and snails that migrate between fresh water and the sea, relying on intact, connected rivers to complete their life cycles. The study, led by PhD student Jeffery CHAN and supervised by Emeritus Professor David DUDGEON of the School of Biological Sciences, The University of Hong Kong (HKU), in collaboration with researchers including Billy LAM from Max Planck Institute for Neurobiology of Behaviour-Caesar and Dr Jia Huan LIEW from the University of Tasmania, found that dams cause widespread disruptions to migratory species, reducing their abundance, species diversity, and genetic diversity. Published in Biological Reviews, the study is the first comprehensive global synthesis of the impacts of dam-induced fragmentation on diadromous species. Drawing on over 100 research outcomes, it finds that while dams pose a major threat to freshwater biodiversity, the full extent of the impacts is underestimated on a global scale due to knowledge gaps and research shortfalls that urgently need to be addressed. The findings show that dams obstruct breeding migratory routes and feeding grounds between coastal waters and rivers. While fish passes – also known as fish ladders – are structures commonly employed to facilitate fish movement around dams and enable free passage between habitats, their effectiveness has consistently proven to be inadequate. ‘We found consistent negative effects across most ecological indicators, especially for species that can’t survive in landlocked environments,’ said Chan. ‘Fish that lack strong climbing or jumping abilities are particularly affected, but even better climbers like eels or species capable of adapting to a landlocked life cycle like salmon are not spared.’ ‘Despite their widespread use, fish passes often underperform, particularly when designed without understanding the specific behaviours and traits of local species,’ added Dr Liew. Dam removal, while sometimes costly and limited by societal needs, was identified as the most consistently effective strategy for restoring connectivity and migration routes in fragmented rivers. This study offers crucial insights for managing freshwater biodiversity amid accelerating dam construction for hydropower generation and climate-driven ecological change. However, the researchers emphasise that significant knowledge gaps remain — particularly in regions where biodiversity is highest, and dam development is most rapid.  Dudgeon points out that ‘China is a world leader in the construction of large dams, and rivers such as the Yangtze and Pearl have been fragmented by multiple dams in ways that are most likely to be irreversible; the effects have not been confined to diadromous species, with virtually all river fishes experiencing population declines leading — in some cases — to extinction’.  Most studies on the effects of dams have focused on temperate species such as salmon, leaving tropical systems and non-fish diadromous animals — such as migratory shrimps and snails — largely understudied. This imbalance limits the understanding of the full global impact of river fragmentation. The authors stress the need for improved ecological assessments during the early stages of dam planning and development to minimise long-term harm. ‘There are many ways to assess and reduce the impacts of dams before they’re built,’ Chan added. ‘With more rigorous planning, standardised guidelines, and context-specific solutions, we can better safeguard the biodiversity of our rivers.’  Read the full journal article here: https://doi.org/10.1111/brv.70032   Dams disrupt river connectivity, posing significant threats to migratory aquatic species and freshwater biodiversity. Image credit: Jeffery C.F. Chan    The migratory giant mottled eel (Anguilla marmorata) relies on connected rivers to complete its life cycle, making it vulnerable to dam-induced fragmentation. Image credit: Jeffery C.F. Chan   The Tahitian prawn (Macrobrachium lar), a migratory crustacean, faces challenges in rivers fragmented by dam construction." Image credit: Jeffery C.F. Chan   

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HKU Science Scholars Shine in 2025 Best Scientists Rankings

HKU Science distinguished scholars have once again been recognised among the world’s top 100 scientists in their respective disciplines by the international academic platform, Research.com in its 2025 rankings. Notably, HKU President and Vice-Chancellor Professor Xiang ZHANG (Department of Physics) and Professor Guochun ZHAO (Department of Earth Sciences) remain the highest-ranked scientists in Asia in their fields, underscoring HKU Science’s continued global leadership in research excellence. Professor Guochun Zhao now ranks 6th globally, climbing two places from last year, while Professor Zhang has risen to 48th globally. Here is the list of HKU Science scholars recognised in the 2025 rankings: Chemistry Professor Chi-Ming CHE (79th globally, 12th in China) Zhou Guangzhao Professor in Natural Sciences and Chair Professor, the Department of Chemistry Earth Science Professor Guochun ZHAO (6th globally, 1st in Asia) Mok Sau-King Professor and Chair Professor, the Department of Earth Sciences Professor Min SUN (20th globally, 5th in China) Emeritus Professor, the Department of Earth Sciences Environmental Sciences Professor Peng GONG (65th globally, 4th in China) Vice-President and Pro-Vice-Chancellor (Academic Development); Chair Professor of Global Sustainability, the Department of Earth Sciences Materials Science Professor Hongjie DAI (17th globally, 9th in US and equivalent of 5th in China) Sapientia Eminence Professor and Chair Professor, the Department of Chemistry, Faculty of Science; J.G.Jackson-C.J. Wood Professor of Chemistry, Emeritus, Stanford University Physics Professor Xiang ZHANG (48th globally, 1st in Asia) President and Vice-Chancellor; Chair of Physics, the Department of Physics In addition, Professor Juha MERILÄ, Chair Professor in Ecology and Biodiversity at the School of Biological Sciences, remains among the third in China in the field of Ecology and Evolution, reflecting his continued influence in the field. The rankings are determined by a scientist's D-index (Discipline H-index), which solely considers publication and citation data within a specific discipline. This recognition highlights the exceptional calibre of HKU’s faculty, whose pioneering research continues to shape the future of their respective fields. HKU's pursuit of excellence and its relentless drive to push the boundaries of knowledge provide a powerful engine for both the nation and Hong Kong to excel on the global stage.

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Professor Yiliang Li and his collaborator were conducting fieldwork to identify and recommend potential landing sites for the upcoming Chinese Mars Sample Return mission.

HKU Astrobiologist Joins National Effort to Map Out China’s Tianwen-3 Mars Sample Return Mission

The origin of life is one of the most fundamental and enduring questions of mankind and one of the three greatest Origin Questions in the natural sciences.  Recently, China has officially launched its Mars Sample Return (MSR) mission, Tianwen-3, marking a significant step forward in planetary exploration. The mission aims to bring Martian samples back to Earth, where advanced laboratory instruments will be employed to conduct comprehensive analyses, seeking to determine whether life ever existed—or may still exist—on Mars. Professor Yiliang LI, an astrobiologist from the Department of Earth Sciences at The University of Hong Kong (HKU), serves as a core member of the Tianwen-3 scientific team and a co-author of a recently published perspective article in Nature Astronomy outlining the mission’s objectives. His role mainly involves leading an HKU group that is working on the selection of the landing site for the Tianwen-3 MSR mission. Schematic of the Chinese Mars Sample Return mission, where the lander will drill 2 metres deep to collect the samples and scoop the surface materials with a robotic arm and drone. Is There Life on Mars? Earth is the only planet we know that harbours life. Research traces the origin of life on Earth dates back to approximately 3.8 billion years ago, around 700 million years after the formation of our solar system. Drawing on theoretical, experimental, and observational approaches, scientists believe that Earth's evolution during its first 700 million years made it a planet capable of producing life and being habitable. However, definitive evidence is still lacking as to whether life on Earth arose solely through indigenous evolution. Like Earth, Mars lies within the habitable zone of our solar system. Research suggests that Mars once had a dense atmosphere and a warm, moist climate early in its history, making it suitable for the emergence and development of microbial life. From an astrobiological perspective, the early Martian environment was conducive to the survival of many of the so-called extremophiles found on Earth. The Mission: Bringing Mars to Earth The key to China's MSR mission lies in identifying Martian materials most likely to preserve evidence of past or present life. To achieve this, Chinese scientists must conduct extensive research before launching the rockets. This includes searching for regions on Mars where liquid water was likely present in the planet’s early history, areas rich in essential metallic nutrients, and sites where traces of Martian microbial activity could potentially be preserved for billions of years. While this article outlines the fundamental framework for these studies, the search for promising sampling sites on Mars remains an ongoing and active endeavour. The MSR mission, scheduled for launch in 2028, involves two separate rockets: 1. A lander, which will land on the Martian surface to collect samples. 2. An orbiter, which will wait in Mars’ orbit to receive the samples and bring them back to Earth. The lander will drill 2 metres underground—a critical depth because the surface of Mars is bombarded with radiation and corrosive chemicals that can destroy any signs of past or present life. Below this hostile surface layer, valuable organic materials may still be preserved. The samples will be transferred to the orbiter and then flown back to Earth for detailed analysis using sophisticated instruments not available on Mars. The roadmap of the Chinese Mars Sample Return mission, which will be launched in 2028. Advancing Planetary Exploration Frontiers The article further highlights that the greatest challenge in returning Mars samples to Earth lies not in the formidable technical or scientific obstacles, but in quarantining and monitoring required once these extraterrestrial materials arrive—a process known as planetary protection. As China is poised to become the first country to return potentially biologically active planetary material, including potential life forms, from beyond Earth, the potential risk such substances might pose to terrestrial life, including humans, is a major concern. To address this, China plans to construct a specialised facility on the outskirts of Hefei, its renowned scientific hub, where Martian samples will undergo comprehensive biochemical and pathological testing under strict isolation from the Earth’s environment. Only after it is conclusively determined that the samples contain no active biological agents or substances that could threaten the Earth’s biosphere will they be released to designated laboratories for in-depth scientific analysis. China's upcoming Mars sample return mission represents the next research goal following the successful deployment of the Zhurong rover on Mars in 2021. With this achievement, China became the second country—after the United States—to successfully land and operate a rover on the Martian surface. In 2020, several countries and entities announced ambitious goals for close-up and in-situ exploration of Mars by around 2030. Ultimately, only China's plan has made significant progress and been realised thus far. The Tianwen mission is China's national effort to explore Mars through interplanetary space missions. The rover Zhurong, depicted in the image, became China's first rover to successfully land on the Martian surface in 2021. The Team Behind Tianwen-3 The article was co-authored by leading experts at the forefront of China’s planetary exploration efforts: •           Liu Jizhong – Chief Engineer of Tianwen-3, Deputy Director of the Science and Technology Committee for Large Space Projects, and Chief Designer of China’s heavy-lift rocket programme. •           Hou Zengqian – Academician and Chief Scientist of Tianwen-3 and China’s National Planetary Exploration Programme, former Vice President of the National Natural Science Foundation of China, and Scientist at the Chinese Academy of Geological Sciences. •           Wang Yuming – Deputy head of the Space Science and Ground Application Demonstration Group for the Tianwen-3 Mars Sample Return Mission. He is also the Deputy Director of the National Key Laboratory for Deep Space Exploration and Professor at the University of Science and Technology of China. He previously led the development of Mars magnetometers and comparative planetary science centres. The perspective article in Nature Astronomy can be accessed via this link.   

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The gold neon dwarf goby (Stiphodon percnopterygionus) is one of many diadromous species affected by dam-induced habitat fragmentation. Image credit: Jeffery C.F. Chan

HKU Ecologists Lead Global Study Revealing Dam Construction's Harmful Impact on Migratory River Species

A global review of research on the impacts of dams has revealed that they are significantly harmful to diadromous species – fish, crustaceans and snails that migrate between fresh water and the sea, relying on intact, connected rivers to complete their life cycles. The study, led by PhD student Jeffery CHAN and supervised by Emeritus Professor David DUDGEON of the School of Biological Sciences, The University of Hong Kong (HKU), in collaboration with researchers including Billy LAM from Max Planck Institute for Neurobiology of Behaviour-Caesar and Dr Jia Huan LIEW from the University of Tasmania, found that dams cause widespread disruptions to migratory species, reducing their abundance, species diversity, and genetic diversity. Published in Biological Reviews, the study is the first comprehensive global synthesis of the impacts of dam-induced fragmentation on diadromous species. Drawing on over 100 research outcomes, it finds that while dams pose a major threat to freshwater biodiversity, the full extent of the impacts is underestimated on a global scale due to knowledge gaps and research shortfalls that urgently need to be addressed. The findings show that dams obstruct breeding migratory routes and feeding grounds between coastal waters and rivers. While fish passes – also known as fish ladders – are structures commonly employed to facilitate fish movement around dams and enable free passage between habitats, their effectiveness has consistently proven to be inadequate. ‘We found consistent negative effects across most ecological indicators, especially for species that can’t survive in landlocked environments,’ said Chan. ‘Fish that lack strong climbing or jumping abilities are particularly affected, but even better climbers like eels or species capable of adapting to a landlocked life cycle like salmon are not spared.’ ‘Despite their widespread use, fish passes often underperform, particularly when designed without understanding the specific behaviours and traits of local species,’ added Dr Liew. Dam removal, while sometimes costly and limited by societal needs, was identified as the most consistently effective strategy for restoring connectivity and migration routes in fragmented rivers. This study offers crucial insights for managing freshwater biodiversity amid accelerating dam construction for hydropower generation and climate-driven ecological change. However, the researchers emphasise that significant knowledge gaps remain — particularly in regions where biodiversity is highest, and dam development is most rapid.  Dudgeon points out that ‘China is a world leader in the construction of large dams, and rivers such as the Yangtze and Pearl have been fragmented by multiple dams in ways that are most likely to be irreversible; the effects have not been confined to diadromous species, with virtually all river fishes experiencing population declines leading — in some cases — to extinction’.  Most studies on the effects of dams have focused on temperate species such as salmon, leaving tropical systems and non-fish diadromous animals — such as migratory shrimps and snails — largely understudied. This imbalance limits the understanding of the full global impact of river fragmentation. The authors stress the need for improved ecological assessments during the early stages of dam planning and development to minimise long-term harm. ‘There are many ways to assess and reduce the impacts of dams before they’re built,’ Chan added. ‘With more rigorous planning, standardised guidelines, and context-specific solutions, we can better safeguard the biodiversity of our rivers.’  Read the full journal article here: https://doi.org/10.1111/brv.70032   Dams disrupt river connectivity, posing significant threats to migratory aquatic species and freshwater biodiversity. Image credit: Jeffery C.F. Chan    The migratory giant mottled eel (Anguilla marmorata) relies on connected rivers to complete its life cycle, making it vulnerable to dam-induced fragmentation. Image credit: Jeffery C.F. Chan   The Tahitian prawn (Macrobrachium lar), a migratory crustacean, faces challenges in rivers fragmented by dam construction." Image credit: Jeffery C.F. Chan   

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Artist's rendition of a fully-frozen Snowball Earth with no remaining liquid surface water. Image credit: Oleg Kuznetsov - 3depix - http://3depix.com .

Scientists Discover a 'Great Pause' in Earth's Oceans After Snowball Earth: A Multi-Million-Year Sediment Starvation That May Have Set the Stage for the Dawn of Animal Life

A new study published in Earth and Planetary Science Letters reveals that in the aftermath of the 'Snowball Earth'—the most severe ice age in our planet's history—the supply of sediment from land to the world's oceans was dramatically reduced for potentially millions of years. Researchers from the HKU Department of Earth Sciences, in collaboration with international partners, used a ‘virtual Earth laboratory’ to show how an extreme sea-level rise effectively cut off the supply of sediment to the outer continental shelf, creating unique marine environments that coincide with the first appearance of complex animal life. The study confronts a long-standing geological puzzle: the origin of ‘cap carbonate’ rocks, which are found globally and sit directly atop glacial deposits from the Cryogenian period. The new research mounts a significant challenge to the prevailing ‘transgressive’ theory — which suggests these rocks formed rapidly — by providing powerful evidence for a ‘hiatus’ model, in which the rocks formed slowly during a lengthy pause in sediment delivery to the ocean. The study’s computer models reveal a dramatic sequence of events after the initial deglaciation: The Cause: The end of the Snowball Earth glaciation triggered an extreme sea-level rise of at least 800 meters. The Trapping: This sea-level rise flooded vast, deep basins carved into the continents by glaciers, creating expansive inland seas that acted as giant sediment traps. The Result: Sand, mud, and silt washing off the recovering continents were trapped in these near-shore environments and could not reach the outer oceans, effectively starving them of sediment. A key finding is the staggering duration of this period of sediment starvation, which the authors call the ‘Great Pause’. While a typical post-ice age sediment pause on a modern continental shelf might last 90,000 to 160,000 years, the models show this period was dramatically longer following Snowball Earth. The Snowball glaciers had likely created continental shelves that were far wider and deeper than today’s, creating enormous space for sediment to be trapped: On a more realistic ‘glacial shelf’, the models predict that sediment starvation lasted approximately 2 million years. Using an ‘Antarctic-like’ margin — arguably the best modern comparison for the post-Snowball Earth world — the hiatus lasted over 3 million years. ‘Imagine oceans suddenly becoming much clearer, with less mud and sand clouding the water,’ explains Dr Nordsvan, lead author and postdoctoral fellow at the HKU Department of Earth Sciences. ‘This starvation would have dramatically altered nutrient cycling and could have created entirely new types of seafloor habitats dominated by carbonates instead of mud. While factors like rising atmospheric oxygen levels are crucial for early animal evolution, our study indicates that large-scale geological changes, driven by the extreme Snowball Earth glacial cycle, could have created unique environmental opportunities favouring the evolution and diversification of complex organisms.’ Crucially, the study's conclusions are not just theoretical. The computer models predicted a specific architectural pattern for the resulting carbonate rock layers: a sharp base, thickening away from the ancient shoreline, with a gradual transition to the mud and sandstones above. This exact pattern is observed in the Snowball Earth cap carbonates in Australia, providing powerful, real-world validation for the model's findings. ‘Our computer simulations show how the massive glaciers of Snowball Earth essentially reset coastal sedimentation,’ adds Professor Ross Mitchell of the Chinese Academy of Science and one of the study’s authors. ‘This resulted in vast areas of the ocean being cut off from their usual supply of sand and mud for potentially millions of years. While seemingly harsh, this sediment starvation could have fundamentally changed ocean chemistry and ecology, possibly opening doors for new, complex life forms to evolve.’ ‘Much like our lives, there’s nothing like a newly built neighbourhood to spur on a new generation to move in, settle down, and create offspring of their own,’ adds Mitchell. These findings not only solve a geological puzzle but also provide a framework for understanding how extreme climate events can reset ecosystems on a planetary scale, paving the way for evolutionary innovation. The authors note that the next steps will involve developing higher-resolution models to investigate the local and regional details of these processes, helping to fully understand the aftermath of this critical period in Earth's history. The research highlights the profound link between geology and biology during a critical period when Earth was recovering from extreme climate change and complex life was beginning to reshape the planet's ecosystems.   Read the journal paper here.   

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HKU Science Scholars Shine in 2025 Best Scientists Rankings

HKU Science distinguished scholars have once again been recognised among the world’s top 100 scientists in their respective disciplines by the international academic platform, Research.com in its 2025 rankings. Notably, HKU President and Vice-Chancellor Professor Xiang ZHANG (Department of Physics) and Professor Guochun ZHAO (Department of Earth Sciences) remain the highest-ranked scientists in Asia in their fields, underscoring HKU Science’s continued global leadership in research excellence. Professor Guochun Zhao now ranks 6th globally, climbing two places from last year, while Professor Zhang has risen to 48th globally. Here is the list of HKU Science scholars recognised in the 2025 rankings: Chemistry Professor Chi-Ming CHE (79th globally, 12th in China) Zhou Guangzhao Professor in Natural Sciences and Chair Professor, the Department of Chemistry Earth Science Professor Guochun ZHAO (6th globally, 1st in Asia) Mok Sau-King Professor and Chair Professor, the Department of Earth Sciences Professor Min SUN (20th globally, 5th in China) Emeritus Professor, the Department of Earth Sciences Environmental Sciences Professor Peng GONG (65th globally, 4th in China) Vice-President and Pro-Vice-Chancellor (Academic Development); Chair Professor of Global Sustainability, the Department of Earth Sciences Materials Science Professor Hongjie DAI (17th globally, 9th in US and equivalent of 5th in China) Sapientia Eminence Professor and Chair Professor, the Department of Chemistry, Faculty of Science; J.G.Jackson-C.J. Wood Professor of Chemistry, Emeritus, Stanford University Physics Professor Xiang ZHANG (48th globally, 1st in Asia) President and Vice-Chancellor; Chair of Physics, the Department of Physics In addition, Professor Juha MERILÄ, Chair Professor in Ecology and Biodiversity at the School of Biological Sciences, remains among the third in China in the field of Ecology and Evolution, reflecting his continued influence in the field. The rankings are determined by a scientist's D-index (Discipline H-index), which solely considers publication and citation data within a specific discipline. This recognition highlights the exceptional calibre of HKU’s faculty, whose pioneering research continues to shape the future of their respective fields. HKU's pursuit of excellence and its relentless drive to push the boundaries of knowledge provide a powerful engine for both the nation and Hong Kong to excel on the global stage.

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Revolutionising Everyday Cleaners - A Greener Way to Produce Alkaline Hydrogen Peroxide

Hydrogen peroxide (H2O2) is a versatile chemical widely used for household cleaning, viral/bacterial sterilisation, textile bleaching, pharmaceuticals, wastewater treatment, chemical conversion, energy carriers, and semiconductor manufacturing. With a global market value of approximately 3.5 billion USD and a projected compound annual growth rate of 5%, its demand and significance continue to expand. However, the predominant production of H2O2, known as the anthraquinone method, is far from ideal. It is energy-intensive, environment taxing, and relies on hazardous materials. Additionally, this method requires chemical stabilisers to ensure the safe transportation of H2O2, further increasing its complexity and cost.  In a recent collaborative publication in Nature Communications, Professor Zhengxiao GUO of HKU Chemistry and Professor Junfeng LIU of Beijing University of Chemical Technology, have unveiled an eco-friendly and efficient alternative for H2O2 production from water. Their innovative method employs a highly efficient electrochemical approach based on the two-electron oxygen reduction pathway (2eORR). Unlike the conventional four-electron ORR (4eORR) that produces low-value oxygen gas, this approach selectively generates H2O2, enabling decentralised, on-demand production while reducing transportation risks, costs, and instability.   This breakthrough is achieved using a special catalyst, Ni-BDC (nickel-benzenedicarboxylic acid), which undergoes in-situ reconstruction during the reaction to form highly active sites. These sites have an optimised surface electronic structure, greatly enhancing the activity and selectivity for HO2⁻ (the deprotonated form of H2O2). Further studies reveal that residual ligand functional groups stabilise *OOH intermediates, which are crucial for improving the reaction's efficiency and selectivity. The catalyst achieves over 90% selectivity for HO2⁻ in alkaline conditions (0.1 M KOH) and operates stably across a wide current density range up to 200 mA cm⁻². It also delivers a high production rate of 13.7 mol gcat⁻¹h⁻¹ and accumulates 2.0 wt.% HO2⁻ over 100 hours of continuous operation. These results demonstrate its strong potential for large-scale industrial applications, as well as for eco-friendly household cleaning. For more details, please see: https://www.nature.com/articles/s41467-025-60467-0

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The cookbook demonstrates how science can transform discarded ingredients into nutritious meals, encouraging healthier eating and sustainable living.

HKU Teams Up with Local Chefs and Sustainability Advocates to Turns Scraps into Delicious Dishes in Innovative Cookbook

Food waste is a pressing global issue with significant environmental and health impacts. In Hong Kong, 3,437 tonnes of food are sent to landfills every day, accounting for 30% of the city’s total waste. The hospitality sector alone contributes 778 tonnes daily. But what if food waste could be transformed into something healthy and valuable? The School of Biological Sciences (SBS) at The University of Hong Kong (HKU) has taken a science-driven approach to this problem. Through detailed analysis, the SBS Food and Nutritional Science team identified nine commonly discarded kitchen scraps — such as cucumber peels, leek tops, lemon peels, onion skins, leftover pasta and rice, tea leaves, and overripe cherry tomatoes, that are not only edible but rich in nutrients. The team advocates for a sustainable method of food consumption and has uncovered hidden nutrients in food waste that may support gut health and reduce inflammation. Professor Jetty Chung-Yung Lee (second from the right, front row), Associate Professor (Teaching) at HKU School of Biological Sciences, leads a team dedicated to tackling food waste. Their cookbook demonstrates how science can transform discarded ingredients into nutritious meals, encouraging healthier eating and sustainable living. Recognising the potential of upcycling food waste to improve public nutrition, the team translated these scientific findings into practical solutions. The result is a new cookbook, Conscious Cooking – Asian Delights, developed in collaboration with sustainability NGO GREEN Hospitality and food-saving app CHOMP as part of the third phase of the Food Waste to Good Taste initiative, funded by HKU Knowledge Exchange. This Asian-inspired cookbook features 20 original recipes, including contributions from HKU students and nine celebrated Hong Kong chefs who share the passion for reducing food waste. The recipes showcase how food scraps can replace traditional ingredients in Asian dishes, and how scraps often tossed aside can be creatively reimagined into nutritious, delicious meals. Chef Barry Quek’s ‘Dry Assam Lemon Noodles’ turns the often-overlooked lemon peel into a star ingredient, creating a dish that’s both zesty and sustainable. Chef Krzysztof Czerwinski’s ‘Tofu Tzatziki’ proves that even cucumber peels can shine, adding a refreshing twist to this creative and sustainable appetiser. In her ‘Dragon Well Tea Shrimp’, Chef May Chow masterfully blends the earthy elegance of tea leaves with the delicate sweetness of shrimp, reimagining a timeless classic. Chef Samaira Kavatkar’s ‘Thayir Sadam’ is a vibrant celebration of how simple leftover rice can be elevated into a creamy, tangy dish bursting with flavour.   ‘Food waste is one of the most pressing issues of our time,’ said Professor Jetty Chung-Yung LEE, Associate Professor (Teaching) at HKU School of Biological Sciences, who leads the project. ‘We’ve discovered that many ingredients often thrown away by households are actually packed with nutritional value. This cookbook showcases how science can help reduce waste, encourage healthier eating and inspire sustainable living, while also changing the way we view and value food waste.’ Beyond the cookbook, the SBS team also worked with food service providers to modify existing menus using nutrient-rich food scraps, bringing science-based, sustainable nutrition directly to consumers, and offering both qualitative and quantitative advantages to the food and beverage industry. The cookbook was officially launched on June 6, bringing together culinary professionals, academics, and sustainability advocates. The event featured cooking demonstrations, food tastings, and a panel discussion. Speakers included Professor Kam Sing WONG, GBS, JP, HKU Adjunct Professor and former Secretary for the Environment; Professor Qiang ZHOU, HKU Dean of Science; and Professor Alice WONG, HKU Associate Vice- President (Research) and Chair Professor of the School of Biological Sciences. This initiative not only addresses the urgent issue of food waste but also enriches the culinary landscape by introducing a sustainable, health-focused approach to food preparation and consumption in Hong Kong.   Celebrating the official launch of the cookbook on June 6, this event united culinary professionals, academics, and sustainability advocates for a day filled with cooking demonstrations, food tastings, and insightful panel discussions. From left: Professor Jetty Lee, Lucia Loposova(Founder & Executive Director of GREEN Hospitality), Professor Kam Sing Wong, Professor Qiang Zhou, Professor Alice Wong and Carla Martinesi(Founder of CHOMP).      Professor Kam Sing Wong gave welcome remarks at the cookbook's launch event.  Chef Chris Winski, the Executive Chef of Soho House Hong Kong, gave a live cooking demonstration.     Behind the scenes content with the chefs can be viewed here About The Food Waste to Good Taste Project Food Waste to Good Taste began in 2022 with educational and student innovation seminars to raise awareness about Hong Kong’s food waste problem. In time, the project has evolved to include hands-on workshops for F&B practitioners, providing them with practical skills and knowledge to minimise waste in their operations. The ‘Conscious Cooking – Asian Delights’ cookbook marks a milestone that hopes to make more of the general public aware of Hong Kong’s food waste problem, and inspire them to take action at home, work and when dining out. About HKU Knowledge Exchange: https://www.ke.hku.hk  About GREEN Hospitality: https://www.greenhospitality.io About CHOMP: www.chomphk.com    About Foodlink Foundation: https://foodlinkfoundation.org

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