A5105508778- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Ichthyology and Marine Biology
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Marine and fisheries research
- Fish Ecology and Management Studies
- Cosmology and Gravitation Theories
- Fish Biology and Ecology Studies
- Black Holes and Theoretical Physics
- Noncommutative and Quantum Gravity Theories
- Dark Matter and Cosmic Phenomena
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Quantum and Classical Electrodynamics
- Satellite Communication Systems
- Neutrino Physics Research
- Identification and Quantification in Food
- Computational Physics and Python Applications
- Marine Bivalve and Aquaculture Studies
- Marine animal studies overview
- Marine Ecology and Invasive Species
- Fish biology, ecology, and behavior
- Semiconductor Quantum Structures and Devices
Tokai University
2013-2023
Toshiba (Japan)
2019-2023
Kyoto Institute of Technology
2023
Shimizu (Japan)
2011-2022
Toho University Medical Center Sakura Hospital
2022
Toho University
2022
Shizuoka University
2021
Shimane University
2021
Osaka University
2019
The University of Tokyo
1978-2018
Abstract Two basic types of spermatozoan aggregates, spermatophores and spermatozeugmata, found in 14 different species sharks, one skate, chimaera (holocephalan), were investigated using light scanning electron microscopy. Spermatophores, aggregates (usually 1,000–6,000 μm diameter larger) randomly clumped sperm embedded surrounded by an eosinophilic matrix, Alopias superciliosus, Odontaspis taurus, Carcharodon carcharias, Isurus oxyrinchus , Lamna nasus . Three structures without a...
Abstract The western Pacific (WP) pattern, characterized by north–south dipolar anomalies in pressure over the Far East and North Pacific, is known as one of dominant teleconnection patterns wintertime Northern Hemisphere. Composite analysis reveals that monthly height exhibit baroclinic structure with their phase lines tilting southwestward lower troposphere. can thus yield not only a poleward heat flux across climatological thermal gradient strong jet but also westward between cooler Asian...
Possible unified models of elementary particles are discussed assuming the existence two kinds neutrino accompanying with electron and muon respectively. The discussions focused on Nagoya model which is based Sakata baryons mesons Gamba-Marshak-Okubo symmetry. In its connection following assumptions taken: i) Fundamental among have one-to-one correspondence leptons or their linear combinations. realized through a kind "matter". ii) Basic do not transmute each other by strong interaction...
An evacuation simulation code based on Multi Agent Systems (MAS), with moderately complex agents in 2D grid envi- ronments, is developed. The main objective of this to estimate the effectiveness measures taken smoothen and speedup process a large urban area, time critical events like tsunami. A vision autonomous navigation algorithm, which enables move through an environment reach far visible destination, implemented. This simple algorithm visitor agent navigate area destination several...
Reproductive characteristics are one of the key factors for understanding population dynamics in fishes. This study describes spawning habitat Pacific bluefin tuna ( Thunnus orientalis ) Kuroshio and Kuroshio–Oyashio transition area. A total 551 adult fish (fork length > 120 cm) were collected during 1994–2007 (except 2001 2003) 2016. Based on a histological analysis gonads, we concluded that actively females mainly present late May to early July. Relative batch fecundity was...
<ns4:p>The taxon Elasmobranchii (sharks and rays) contains one of the long-established evolutionary lineages vertebrates with a tantalizing collection species occupying critical aquatic habitats. To overcome current limitation in molecular resources, we launched Squalomix Consortium 2020 to promote genome-wide array approaches, specifically targeting shark ray species. Among various bottlenecks working elasmobranchs are their elusiveness low fecundity as well large highly repetitive genomes....
Squid are the fastest swimming invertebrates, but metabolic cost of speed, as assessed in swim‐tunnels, is several‐fold higher than fish, making squid appear uncompetitive. Because oxygen consumption can be correlated with jet pressure, it possible to monitor pressure and thus estimate performance energy costs nature. Tracking course depth gave a 3‐D view (Loligo forbesi) activities for nearly three animal‐weeks; five days this included telemetry pressures. These 2–5 kg loliginids hovered...
The white shark, a top predator inhabiting the world’s oceans, is an endangered species. However, knowledge of its life-history traits and population structure still limited. We hypothesised that would vary among populations because species’ various habitats are diverse change through time. Age was estimated by counting growth bands in centra sharks caught Japan. von Bertalanffy parameters were at L∞ = 455 cm TL, k 0.196 year–1 t0 –1.92 years for males 607 0.159 –1.80 females. rate to...
White sharks are highly migratory apex predators, globally distributed in temperate, sub-tropical, and tropical waters. Knowledge of white shark biology ecology has increased recently based on research at known aggregation sites the Indian, Atlantic, Northeast Pacific Oceans; however, few data available for Northwest Ocean. This study provides a meta-analysis 240 observations from Ocean between 1951 2012. Records comprise reports bycatch commercial fisheries, media accounts, personal...
This is the first known report on skeletal and muscular systems, skin histology, of pectoral fin rare planktivorous megamouth shark Megachasma pelagios. The characterized by three features: 1) a large number segments in radial cartilages; 2) highly elastic skin; 3) vertically-rotated hinge joint at base. These features suggest that remarkably flexible mobile, this flexibility mobility enhance dynamic lift control, thus allowing for stable swimming slow speeds. contrasts with fast-swimming...
The reproductive biology of the blue shark (Prionace glauca) in western North Pacific Ocean was investigated to contribute future stock assessments because limitations recent studies and lack information about cycle. Reproductive data were obtained from 490 males (precaudal length (PCL), 33.4–252.0cm) 432 females (PCL, 33.4–243.3cm). Size at 50% maturity estimated be 160.9cm for 156.6cm PCL females. Litter size varied 15 112 (mean 35.5) positively correlated with maternal PCL. Parturition,...
The feeding mechanisms of elasmobranchs and their functioning have been receiving growing scientific attention, although less emphasis has yet to be directed towards batoid species. present study investigated the use orobranchial musculature during prey capture processing behavior in Potamotrygon motoro. Ten muscle groups were removed determine relative biomasses. kinematics was described based on videos manipulation under captive conditions recorded at 250 500 field/s. Analyses indicated...
Abstract The mammalian liver has a structural and functional unit called the lobule, in periphery of which portal triad consisting vein, bile duct hepatic artery is developed. This type architecture detectable many other vertebrates, including amphibians birds, whereas intrahepatic ducts run independently vein distribution actinopterygians such as salmon tilapia. It remains to be clarified how architectures are phylogenetically developed among vertebrates. present study morphologically...
The possibility of time reversal transformation is investigated from the general viewpoint quantized field theory. so defined as to preserve canonical formalism It found in §2 that there are two kinds such transformations, which shown correspond so-called Pauli’s and Wigner’s respectively. In §3 properties physical quantities under these transformations examined then meanings clarified. §4 some considerations made whether invariance requirement really imposes restrictions on form interaction...