Ibaraki University

Conserved Met16 of Pseudoazurin Facilitates the Interprotein Electron Transfer to Copper-Containing Nitrite Reductase

Abstract Enzyme reaction of copper-containing nitrite reductase relies on the electron donor, pseudoazurin, yet the role of conserved pseudoazurin Met16 in electron transfer remains unclear. Combining cyclic voltammetry and stopped-flow kinetics, we show Met16 variants reduce kap...

A conjecture on monomial realizations and polyhedral realizations for crystal bases

Crystal bases are powerful combinatorial tools in the representation theory of quantum groups U q ( 𝔤 ) for a symmetrizable Kac-Moody algebras 𝔤 . The polyhedral realizations are combinatorial descriptions of the crystal base B ( ∞ ) for Verma modules in terms of the set of integ...

A gauge-theoretic formulation of Nambu non-equilibrium thermodynamics

We present a gauge-theoretic formulation of Nambu non-equilibrium thermodynamics (NNET) within a common gauge-fixed worldline framework. In this formulation, the generalized thermodynamic force is described by an Abelian thermodynamic connection, and ordinary Onsager dynamics is...

One-Pot Synthesis of Oxidation-Resistant Silica-Coated Iron Nanoparticles via Ultrasonically Assisted Citrate Modification

Abstract This study presents a facile, one-pot aqueous coating strategy to synthesize oxidation-resistant silica-coated iron (Fe/SiO2) core–shell nanoparticles under ambient conditions. Citrate-mediated reduction produced metallic Fe cores, with citrate ions and a thin native sur...

Thermospheric response to solar EUV variability probed with orbital-energy decay from NinjaSat CubeSat GNSS telemetry

Solar extreme ultraviolet (EUV) radiation heats and expands the thermosphere, modulating atmospheric density at altitudes in low Earth orbit and thereby increasing satellite drag and accelerating orbital decay. Previous studies have relied on empirical solar proxies, such as the...

Fixed-Sequence Confidence-Interval Calibration for Finite-Sample Selective Risk Control

Selective prediction requires a statistically reliable rule for deciding which model outputs can be returned while controlling the error rate among accepted predictions. In large language model (LLM) applications, uncertainty scores provide useful ranking information, but directl...

Hour-scale response of low-Earth-orbit satellite altitude to extreme geomagnetic storms revealed by the NinjaSat CubeSat during the 2024 solar maximum

Abstract Extreme geomagnetic storms accelerate low-Earth-orbit satellite decay by inflating the thermosphere, yet the hour-scale pathway from solar-wind energy to atmospheric heating is poorly understood. Using the GNSS receiver of the NinjaSat CubeSat ( $$\sim 500$$ km, $$97^\ci...

Circularly Polarized Electroluminescence and Spin‐Polarized Carrier Transport in Chiral‐Doped Polymer Films

ABSTRACT Circularly polarized electroluminescence (CPEL) based on spin‐dependent light emission is of considerable interest for functional chiral optoelectronics and spin‐photonic applications. Here we report CPEL from devices incorporating achiral poly(9,9‐dioctylfluorene) (PFO)...

Adsorption of Per- and Polyfluoroalkyl Substances across Molecular Classes: Understanding Adsorption Behavior and Adsorbent Performance

Abstract Per- and polyfluoroalkyl substances (PFASs) have been widely used in industrial and commercial applications because of the exceptional chemical and thermal stability of their C–F bonds and their water- and oil-repellent properties. Some PFASs (hereafter called “specific...

The parent bodies of Ryugu and Ivuna formed before those of other carbonaceous chondrites

Most carbonaceous chondrite (CC) meteorites contain abundant chondrules, millimeter-scale spherical inclusions of previously molten material. Ivuna-type carbonaceous chondrites (CIs) do not contain chondrules, nor do samples of the carbonaceous asteroid Ryugu. CIs and Ryugu share...

A Bayesian Approach to Nuclear Spin Relaxation Phenomena in Topological Kondo Insulator SmB 6

In studies of the promising topological Kondo insulator (TKI) candidate SmB 6 , nuclear magnetic resonance (NMR) measurements of the spin–lattice relaxation rate, 1/T 1 , have provided crucial insights into this compound: for example, the unique opening of a small hybridization g...