Publications by authors named "H Sugahara"
Ammonia (NH) is a simple and essential nitrogen carrier in the universe. Its adsorption on mineral surfaces is an important step in the synthesis of nitrogenous organic molecules in extraterrestrial environments. The nitrogen isotopic ratios provide a useful tool for understanding the formation processes of N-bearing molecules.
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- The study investigates how new antirheumatic drugs affect the characteristics of lymphoproliferative disorder (LPD) in rheumatoid arthritis (RA) patients, using data from 53 hospitals in Japan between 1999 and 2021.
- A total of 752 patients with RA-associated LPD were compared to 770 with sporadic LPD, revealing notable differences in their clinical features and the impact of various drug combinations.
- The findings suggest that medications taken before LPD onset may alter its characteristics, and recommend tocilizumab (TCZ) as a better treatment option after LPD has developed.
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- Polycyclic aromatic hydrocarbons (PAHs) make up about 20% of carbon in the interstellar medium and can form under various conditions, including in hot circumstellar environments and cold interstellar clouds.
- Isotopic analysis of PAHs from asteroid Ryugu and meteorite Murchison shows that some PAHs, like naphthalene, fluoranthene, and pyrene, have higher carbon isotopic values than expected, indicating they likely formed in the interstellar medium rather than in hot environments.
- In contrast, the PAHs phenanthrene and anthracene from Ryugu display isotopic values that suggest they were formed through higher-temperature reactions.
Many aphid-borne viruses are important pathogens that affect wheat crops worldwide. An aphid-transmitted closterovirus named wheat yellow leaf virus (WYLV) was found to have infected wheat plants in Japan in the 1970s; however, since then, its viral genome sequence and occurrence in the field have not been investigated. We observed yellowing leaves in the 2018/2019 winter wheat-growing season in an experimental field in Japan where WYLV was detected five decades ago.
View Article and Find Full Text PDFThe Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. The samples were expected to contain organic molecules, which record processes that occurred in the early Solar System. We analyzed organic molecules extracted from the Ryugu surface samples.
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