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News from Japan

Updates every hour. Last Updated: 22-Oct-2026 20:16 ET (23-Oct-2026 00:16 GMT/UTC)

Harvesting UV Light from sunlight just got ‘solid’

Kyushu University
Peer-Reviewed Publication

Kyushu University researchers have overcome a long-standing challenge of efficiently converting visible light into UV in solid materials through precise molecular design. By adding side chains to the sp³ carbon atoms of an organic molecule, they achieved high luminescence and efficient energy transfer in the solid state. The system reaches 1.9% conversion efficiency under weak light intensity comparable to sunlight, opening the door to applications including solar-driven photocatalysts, indoor air purification, OLEDs, and 3D printing.

Journal: Nature Communications
Funder: Japan Science and Technology Agency, Japan Society for the Promotion of Science

Ultrasound propagation in porous rocks: Theory identifies three distinct wave modes

University of Tsukuba
Peer-Reviewed Publication

Researchers at University of Tsukuba have developed a theoretical framework to clarify the propagation of ultrasonic waves through complex materials such as rocks containing mixtures of oil, water, and gas bubbles. Understanding this process is essential for improving technologies such as enhanced oil recovery, which employs ultrasound to mobilize trapped heavy oil. This study reveals the coexistence of three types of compressional waves in these complex materials and emphasizes the role of heavy-oil viscoelasticity and bubble oscillations in controlling ultrasonic-energy dissipation.

Journal: Physics of Fluids

Sustainable future: New blueprint for affordable clean energy

The University of Electro-Communications
Peer-Reviewed Publication

Researchers have discovered the secret to high-performance, low-cost fuel cells. The key lies in the "electrical harmony" between a sustainable carbon catalyst and its support material. This breakthrough provides a blueprint for creating metal-free catalysts that outperform platinum, potentially making clean hydrogen energy more affordable.

Journal: Langmuir
Funder: JSPS KAKENHI

Non-Hermitian quantum mechanics: Uncovering the geometric properties unique to energy-non-conserving systems

Advanced Institute for Materials Research (AIMR), Tohoku University

Theoretical physicists at AIMR have identified conditions under which the geometric contribution to adiabatic amplification becomes path-independent in non-Hermitian quantum systems. Their framework, grounded in non-Hermitian Berry phase theory, reveals that the Petermann factor governs this behavior—offering both new geometric insights and a practical route to measuring this quantity experimentally.

Journal: Physical Review Research

Financial education may need to move beyond knowledge alone in the digital age

Hiroshima University
Peer-Reviewed Publication

A Hiroshima University-led study conducted with Rakuten Securities finds that practical digital skills, positive financial attitudes, and self-protection are more consistently associated with lower old-age anxiety than traditional financial knowledge alone.

Journal: International Journal of Financial Studies
Funder: Rakuten Securities, Ministry of Health, Labour and Welfare of Japan, Japan Society for the Promotion of Science

Paneth cell metaplasia may act as a protective response in ulcerative colitis

Institute of Science Tokyo
Peer-Reviewed Publication

Paneth cell metaplasia (PCM), long viewed as a consequence of chronic inflammation in ulcerative colitis, may also help protect and repair the intestine, according to researchers at Science Tokyo. The study found that inflammation increases IL-22 signaling, which promotes PCM and the production of REG3A, a protein that helps heal the intestinal lining. The findings suggest PCM may be a protective response but should be monitored because persistent PCM could increase cancer risk.

Journal: Nature Communications
Funder: Japan Society for the Promotion of Science / Ministry of Education, Culture, Sports, Science and Technology, Japan Agency for Medical Research and Development, EA Pharma Co., Ltd., Tokyo Medical and Dental University, Tsuchida Research Grant, Japanese Society for Inflammatory Bowel Diseases, Young Innovative Medical Scientist Unit, Innovative Medicines Initiative 2 Joint Undertaking, EUHorizaon 2020 and European Federation of Pharmaceutical Industries and Associations, German Research Foundation, SH Excellence Chair Program

Beyond nutrition: Role of dietary fiber metabolites in the development of dendritic cells

Tokyo University of Science
Peer-Reviewed Publication

Short-chain fatty acids (SCFAs), produced by gut microbiota through the fermentation of dietary fiber, play an important role in regulating immune responses. A new study investigated the role of butyrate, an SCFA, in the development and differentiation of dendritic cells. The findings revealed that butyrate primarily acts by inhibiting histone deacetylases, leading to increased histone acetylation around genes involved in dendritic cell development and differentiation.

Journal: Allergology International
Funder: Grants-in-Aid for Scientific Research, Grant-in-Aid for Early-Career Scientists, Research Fellowship for Young Scientists, Grant-in-Aid for JSPS Fellows, Scholarship for Doctoral Students in Immunology from the Japanese Society for Immunology, Tokyo University of Science Grant for President’s Research Promotion, Tojuro Iijima Foundation for Food Science and Technology, Research Grant from the Mishima Kaiun Memorial Foundation, Joint Research Grant from the Research Center for Radiation Disaster Medical Science, Research Grant from the Takeda Science Foundation, Foundation for Dietary Scientific Research

Lithium-doped carbon nanorings show promise for next-generation optical devices

National Institutes of Natural Sciences
Peer-Reviewed Publication

Nonlinear optical materials are essential for advanced photonics and laser technologies, but researchers are still searching for ways to optimize organic, carbon-based alternatives. Using computational modeling, scientists demonstrated that adding a lithium atom to the outside of a carbon molecule made of 12 benzene rings creates a material with exceptionally strong optical responses. This performance boost is driven by a synergistic combination of the carbon ring's natural electron sharing and a lithium-induced transfer of electrical charge. These findings establish fundamental design principles for developing superior carbon-based photonic devices in the future.

Journal: Chemical Physics
Funder: Natural Science Foundation of Shaanxi Province, Natural Science Foundation of Shaanxi Provincial Department of Education, Xi'an Youth Talent Support Program, JSPS KAKENHI, Grant-in-Aid for Transformative Research Areas (A), 2024 Key Talent Projects of Gansu Province, National Natural Science Foundation of China, Science and Technology Program Project of Xi'an, Scientific Research Program of the Education Department of Shaanxi Province, Innovation Capability Support Program of Shaanxi

Genetic analyses reveal the taxonomic identity and glacial relict history of Betula costata in Japan

University of Tsukuba
Peer-Reviewed Publication

Researchers at University of Tsukuba have found that Betula costata, a birch species recently discovered at several locations in central Japan, is phylogenetically indistinguishable from populations on the Asian continent. The species is thought to have been widely distributed throughout the Japanese Archipelago during the Last Glacial Maximum, with its range subsequently contracting as the climate warmed. The study also identifies clear diagnostic characteristics that distinguish B. costata from its closely related species, Betula ermanii.

Journal: Plant Species Biology

Balancing stability and reactivity: A new palladium precatalyst for high-performance catalysis

University of Tsukuba
Peer-Reviewed Publication

Researchers at University of Tsukuba have developed a new palladium (Pd) precatalyst that combines exceptional stability with high catalytic performance. This precatalyst can be stored for extended periods under ambient conditions and suppresses undesirable side reactions during activation, highlighting its potential for the efficient synthesis of organic materials and pharmaceuticals.

Journal: Inorganic Chemistry Frontiers

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