Search results for: Nobuyuki Miyazaki

Items from 1 to 20 out of 85 results

article

Morphology and physiology in some small pelagic cetaceans: Is Dall's porpoise a deep diver and a thoroughbred of the sea?

Paul J. Ponganis, Yoshihiro Fujise, Nobuyuki Miyazaki

Marine Mammal Science > 38 > 4 > 1442 - 1469

Heart size and blood oxygen (O₂) in Dall's porpoises (Phocoenoides dalli), Pacific white‐sided dolphins (Lagenorhynchus obliquidens), and common bottlenose dolphins (Tursiops truncatus) correlate with reported swim speeds and dive behavior. Deep‐dive capacity is often associated with smaller relative lung masses, larger “inexpensive” tissue masses (locomotor muscle + blubber + bone masses), and larger...

chapter

Relation Between Body Tilt Angle and Tail Beat Acceleration of a Small Fish, Parapristipoma trilineatum (Threeline Grunt), During Mobile and Immobile Periods Measured with a Micro Data Logger

Teruhisa Komatsu, Hideaki Tanoue, Natheer Mohammad, Kyoko Watariguchi, more

Global Change: Mankind-Marine Environment Interactions > Observation of marine environment > 261-264

Recently, data loggers that can measure acceleration of two- or three-dimensional axes have been downsized to 5 cm length and 1 cm width. Thus, behavior of small fish can be studied with a micro data logger. We used a small data logger (M190L-D2GT, Little Leonardo Co. Ltd., Tokyo) to measure the behavior of a bentho-pelagic fish, the threeline grunt (Parapristipoma trilineatum). The logger...

article

Three-dimensional mapping of red stingray (Dasyatis akajei) movement with reference to bottom topography

Takayoshi Otaki, Masahiro Hamana, Hideaki Tanoe, Nobuyuki Miyazaki, more

Ocean Science Journal > 2015 > 50 > 2 > 327-334

Most demersal fishes maintain strong relations with bottom substrates and bottom depths and/or topography during their lives. It is important to know these relations to for understand their lives. In Tokyo Bay, red stingray, Dasyatis akajei, classified as near-threatened species by IUCN, has increased since the 1980s. It is a top predator and engages in ecosystem engineer by mixing the sand bed surface...

article

In vivo wear particles of remelted highly crosslinked polyethylene after total hip arthroplasty: report of four cases

Kanako Hata, Yukihide Minoda, Mitsuhiko Ikebuchi, Shigekazu Mizokawa, more

Journal of Materials Science: Materials in Medicine > 2015 > 26 > 3 > 1-4

This is the first report of in vivo wear particles from four total hip arthroplasties using remelted highly crosslinked polyethylene. The number of particles was (1.51 ± 0.45) × 10 ⁷ g ⁻¹ (mean ± standard error); particle size (equivalent circle diameter), 0.72 ± 0.15 µm; and roundness, 1.45 ± 0.05. Remelted highly crosslinked polyethylene generates fewer, rounder,...

article

Summer migration to temperate foraging habitats and active winter diving of juvenile loggerhead turtles Caretta caretta in the western North Pacific

Tomoko Narazaki, Katsufumi Sato, Nobuyuki Miyazaki

Marine Biology > 2015 > 162 > 6 > 1251-1263

Endangered loggerhead turtles (Caretta caretta) are highly migratory marine reptiles that spend extended maturation periods at sea. Although an understanding of the biology and ecology of juveniles is essential for effective conservation of this species, such information is still limited, especially for the North Pacific population. The first quantitative bycatch survey in northern Japan revealed...

article

Swimming behavior of Chinese sturgeon in natural habitat as compared to that in a deep reservoir: preliminary evidence for anthropogenic impacts

Yuuki Y. Watanabe, Qiwei Wei, Hao Du, Luoxin Li, more

Environmental Biology of Fishes > 2013 > 96 > 1 > 123-130

Unusually deep water due to dam construction has the potential to negatively effect endangered sturgeons, which lack a physiological mechanism to inflate their swimbladder and may be unable to remain buoyant under high pressure at depth. In a previous study, some juvenile sturgeons released in a deep (>100 m) reservoir lost buoyancy and stayed nearly motionless on the bottom. However, it is not...

article

The implications of turning behaviour performed by Amazonian manatees after release into the wild

Mumi Kikuchi, Vera M. F. da Silva, Fernando C. W. Rosas, Diogo Souza, more

Journal of Ethology > 2012 > 30 > 1 > 187-190

Sirenians have dichromatic colour vision and tactile hairs but have not developed underwater echolocation. Amazonian manatees (Trichechus inunguis) live in turbid water and it has been unclear how they understand their surroundings. In this study, we recorded the 3D movements of two captive-raised Amazonian manatees. The results revealed that the manatees always swam in a circular pattern. Both animals...

article

Feeding events of Japanese lates Lates japonicus detected by a high-speed video camera and three-axis micro-acceleration data-logger

Hideaki Tanoue, Teruhisa Komatsu, Takurou Tsujino, Ippei Suzuki, more

Fisheries Science > 2012 > 78 > 3 > 533-538

The feeding events of wild animals have been widely researched in recent decades. The use of invasive methods to determine stomach contents in which the fish is killed can, however, be considered to be unjustifiable in the case of an endangered fish, such as the Japanese late. Here, we report on a method that can be used to verify feeding events of a fish species without the need for killing the fish...

article

Comparison of the amount of thiotrophic symbionts in the deep-sea mussel Bathymodiolus septemdierum under different sulfide levels using fluorescent in situ hybridization

Masaru Fujinoki, Tomoko Koito, Suguru Nemoto, Mitsugu Kitada, more

Fisheries Science > 2012 > 78 > 1 > 139-146

Various invertebrates inhabiting hydrothermal vents harbor thiotrophic endosymbionts that provide the host with nutrients and are possibly involved in the detoxification of harmful sulfides. In this study, we first determined the partial 16S rRNA gene sequence of the thiotrophic symbiont of the deep-sea mussel Bathymodiolus septemdierum, a dominant species at hydrothermal vents in the Izu–Ogasawara...

article

Distribution of Antifouling Biocides and Perfluoroalkyl Compounds in Sediments From Selected Locations in Indonesian Coastal Waters

Hiroya Harino, Zainal Arifin, Inneke F. M. Rumengan, Takaomi Arai, more

Archives of Environmental Contamination and Toxicology > 2012 > 63 > 1 > 13-21

Coastal marine environments are considered to be the most sensitive areas for the accumulation of organotin (OT) compounds and other emerging new pollutants, such as perfluoroalkyl compounds. Contamination by these compounds is a matter of great concern due to their accumulation and possible negative impact on the coastal environment and organisms. The concentrations of tributyltin (TBT) compounds...

article

Chondrosarcoma of sacrum presenting with a deep vein thrombosis

Shinji Minami, Shinji Kounami, Ryosuke Sakata, Nobuyuki Miyazaki, more

Journal of Orthopaedic Science > 2011 > 16 > 4 > 482-486

article

Vocal exchanges of signature whistles in bottlenose dolphins (Tursiops truncatus)

Fumio Nakahara, Nobuyuki Miyazaki

Journal of Ethology > 2011 > 29 > 2 > 309-320

Bottlenose dolphins (Tursiops truncatus) produce individually distinctive vocalizations—referred to as “signature whistles”—that are thought to function as an individual and conspecific recognition system for maintenance of consistent contact between individuals. Observations and playback experiments were conducted at aquariums to study these whistle–vocal exchanges in bottlenose dolphins. Temporal...

article

In vivo patch-clamp analysis of dopaminergic antinociceptive actions on substantia gelatinosa neurons in the spinal cord

Wataru Taniguchi, Terumasa Nakatsuka, Nobuyuki Miyazaki, Hiroshi Yamada, more

Pain > 2011 > 152 > 1 > 95-105

To elucidate the mechanisms of antinociception mediated by the dopaminergic descending pathway in the spinal cord, we investigated the actions of dopamine (DA) on substantia gelatinosa (SG) neurons by in vivo whole-cell patch-clamp methods. In the voltage-clamp mode (V _H =−70mV), the application of DA induced outward currents in about 70% of SG neurons tested. DA-induced outward current was...

article

Scaling of swim speed in breath‐hold divers

Yuuki Y. Watanabe, Katsufumi Sato, Yutaka Watanuki, Akinori Takahashi, more

Journal of Animal Ecology > 80 > 1 > 57 - 68

1. Breath‐hold divers are widely assumed to descend and ascend at the speed that minimizes energy expenditure per distance travelled (the cost of transport (COT)) to maximize foraging duration at depth. However, measuring COT with captive animals is difficult, and empirical support for this hypothesis is sparse. 2. We examined the scaling relationship of swim speed in free‐ranging diving birds, mammals...

article

Differences in stable isotope ratios of Dall’s porpoises (Phocoenoides dalli) between coastal and oceanic areas of the North Pacific

HIROSHI OHIZUMI, NOBUYUKI MIYAZAKI

Fisheries Oceanography > 19 > 4 > 257 - 261

Carbon and nitrogen stable isotope ratios in the muscle of Dall’s porpoises were measured. Samples were collected from the catches of the hand harpoon fishery, incidental catches of drift net, and scientific research on the use of drift nets. Samples were from the North Pacific, Sea of Japan, Sea of Okhotsk, and Bering Sea. Although no variation in δ¹⁵N was observed, δ¹³C was significantly different...

article

Effect of long-term exposure to sulfides on taurine transporter gene expression in the gill of the deep-sea mussel Bathymodiolus platifrons, which harbors a methanotrophic symbiont

Tomoko Koito, Ikumi Nakamura-Kusakabe, Takao Yoshida, Tadashi Maruyama, more

Fisheries Science > 2010 > 76 > 2 > 381-388

Seawater around deep-sea hydrothermal vents and cold seeps contain high levels of hydrogen sulfide, which is toxic to most animals. Invertebrates inhabiting these environments have been reported to accumulate high levels of thiotaurine, a sulfur-containing amino acid. Thiotaurine is likely to play an important role in sulfide detoxification, but its functions in the detoxification process are still...

article

Phylogenetic analyses in cetacean species of the family Delphinidae using a short wavelength sensitive opsin gene sequence

Tomoko Koito, Kaoru Kubokawa, Shinsuke Tanabe, Nobuyuki Miyazaki

Fisheries Science > 2010 > 76 > 4 > 571-576

The short wavelength sensitive (SWS) opsin gene is expected to contain informative sites for understanding the speciation of the family Delphinidae, because it is not functional in cetaceans. We determined partial SWS gene sequences from 15 delphinid species of 12 genera and from harbor porpoise for comparison. We found a 39-bp insertion that was shared by six species (the insertion group: Delphinus delphis...

article

In vivo patch-clamp analysis of the actions of dopaminergic nervous system in substantia gelatinosa neurons of the rat spinal cord

Wataru Taniguchi, Terumasa Nakatsuka, Nobuyuki Miyazaki, Tadakazu Abe, more

Neuroscience Research > 2010 > 68 > Supplement 1 > e159

article

Johor Strait as a Hotspot for Trace Elements Contamination in Peninsular Malaysia

Syaizwan Zahmir Zulkifli, Ahmad Ismail, Ferdaus Mohamat-Yusuff, Takaomi Arai, more

Bulletin of Environmental Contamination and Toxicology > 2010 > 84 > 5 > 568-573

Present study was conducted to evaluate current status of trace elements contamination in the surface sediments of the Johor Strait. Iron (2.54 ± 1.24%) was found as the highest occurring element, followed by those of zinc (210.45 ± 115.4 μg/g), copper (57.84 ± 45.54 μg/g), chromium (55.50 ± 31.24 μg/g), lead (52.52 ± 28.41 μg/g), vanadium (47.76 ± 25.76 μg/g), arsenic (27.30 ± 17.11 μg/g), nickel...

article

An assessment of selected trace elements in intertidal surface sediments collected from the Peninsular Malaysia

Syaizwan Zahmir Zulkifli, Ferdaus Mohamat-Yusuff, Takaomi Arai, Ahmad Ismail, more

Environmental Monitoring and Assessment > 2010 > 169 > 1-4 > 457-472

Concentrations of 11 trace elements (V, Cr, Co, Ni, Cu, Zn, As, Ag, Cd, Pb, and U) were determined in the intertidal surface sediments of Peninsular Malaysia. The average trace element concentrations are ranked as follows: Zn>V>As>Cr>Pb>Cu>Ni>Co>U>g>Cd. Interim Sediment Quality Guidelines (ISQGs) employed in present study are the Australia and New Zealand joint guideline...

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INFONA - science communication portal

Search results for: Nobuyuki Miyazaki

Morphology and physiology in some small pelagic cetaceans: Is Dall's porpoise a deep diver and a thoroughbred of the sea?

Relation Between Body Tilt Angle and Tail Beat Acceleration of a Small Fish, Parapristipoma trilineatum (Threeline Grunt), During Mobile and Immobile Periods Measured with a Micro Data Logger

Three-dimensional mapping of red stingray (Dasyatis akajei) movement with reference to bottom topography

In vivo wear particles of remelted highly crosslinked polyethylene after total hip arthroplasty: report of four cases

Summer migration to temperate foraging habitats and active winter diving of juvenile loggerhead turtles Caretta caretta in the western North Pacific

Swimming behavior of Chinese sturgeon in natural habitat as compared to that in a deep reservoir: preliminary evidence for anthropogenic impacts

The implications of turning behaviour performed by Amazonian manatees after release into the wild

Feeding events of Japanese lates Lates japonicus detected by a high-speed video camera and three-axis micro-acceleration data-logger

Comparison of the amount of thiotrophic symbionts in the deep-sea mussel Bathymodiolus septemdierum under different sulfide levels using fluorescent in situ hybridization

Distribution of Antifouling Biocides and Perfluoroalkyl Compounds in Sediments From Selected Locations in Indonesian Coastal Waters

Chondrosarcoma of sacrum presenting with a deep vein thrombosis

Vocal exchanges of signature whistles in bottlenose dolphins (Tursiops truncatus)

In vivo patch-clamp analysis of dopaminergic antinociceptive actions on substantia gelatinosa neurons in the spinal cord

Scaling of swim speed in breath‐hold divers

Differences in stable isotope ratios of Dall’s porpoises (Phocoenoides dalli) between coastal and oceanic areas of the North Pacific

Effect of long-term exposure to sulfides on taurine transporter gene expression in the gill of the deep-sea mussel Bathymodiolus platifrons, which harbors a methanotrophic symbiont

Phylogenetic analyses in cetacean species of the family Delphinidae using a short wavelength sensitive opsin gene sequence

In vivo patch-clamp analysis of the actions of dopaminergic nervous system in substantia gelatinosa neurons of the rat spinal cord

Johor Strait as a Hotspot for Trace Elements Contamination in Peninsular Malaysia

An assessment of selected trace elements in intertidal surface sediments collected from the Peninsular Malaysia

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