Hideki Fukuda
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View article: Different structuring factors and distribution patterns of marine prokaryotic and eukaryotic communities in the subtropical Kuroshio region
Different structuring factors and distribution patterns of marine prokaryotic and eukaryotic communities in the subtropical Kuroshio region Open
To clarify the differences in the effect of environments on community structures and in distribution patterns between marine prokaryotes and microbial eukaryotes, microbial communities were investigated spatially and seasonally in the surf…
View article: Patterns in marine surface fish biodiversity and community composition detected by different eDNA metabarcoding sampling methods
Patterns in marine surface fish biodiversity and community composition detected by different eDNA metabarcoding sampling methods Open
Understanding marine surface fish diversity is crucial for ecosystem management. However, the traditional sampling methods are often invasive, costly, or unsuitable for certain species or locations. Environmental DNA (eDNA) metabarcoding p…
View article: Microorganisms Contributing to the Biological Pump in the Western Arctic Ocean During Late Summer
Microorganisms Contributing to the Biological Pump in the Western Arctic Ocean During Late Summer Open
Marine particles can be classified into sinking and suspended particles, and recent studies have revealed that the microbial communities associated with each particle are distinct. The western Arctic Ocean has undergone significant environ…
View article: Organic particle scavenging by marine bacteria: influences of bacterial nanoscale surface properties
Organic particle scavenging by marine bacteria: influences of bacterial nanoscale surface properties Open
Marine bacteria contribute to biogeochemical cycles by scavenging organic nanoparticles such as cell fragments, viruses, excretions from phytoplankton and bacteria, and naturally occurring polymeric substances. Nonetheless, bacterial surfa…
View article: Metabolic reprogramming of protists within the microbiome of sinking particles
Metabolic reprogramming of protists within the microbiome of sinking particles Open
Protists play a crucial role in the biological carbon pump, yet their metabolic activity and function in sinking particles, which drive the aggregation and degradation of organic carbon, remains poorly characterized. Here, we examined tran…
View article: Probe Capture Enrichment Sequencing of <scp><i>amoA</i></scp> Genes Improves the Detection of Diverse Ammonia‐Oxidising Archaeal and Bacterial Populations
Probe Capture Enrichment Sequencing of <span><i>amoA</i></span> Genes Improves the Detection of Diverse Ammonia‐Oxidising Archaeal and Bacterial Populations Open
The ammonia monooxygenase subunit A ( amoA ) gene has been used to investigate the phylogenetic diversity, spatial distribution and activity of ammonia‐oxidising archaeal (AOA) and bacterial (AOB), which contribute significantly to the nit…
View article: Structuring of particle-associated bacterial communities along the extracellular polymeric substance gradient of sinking and suspended particles in an oligotrophic, subtropical region of the western North Pacific Ocean
Structuring of particle-associated bacterial communities along the extracellular polymeric substance gradient of sinking and suspended particles in an oligotrophic, subtropical region of the western North Pacific Ocean Open
Extracellular polymeric substances, such as transparent exopolymer particles (TEP) composed of acidic polysaccharides, are important particulate organic carbon (POC) components of marine environments that affect particle dynamics and ocean…
View article: Laminin 511 E8 fragment promotes to form basement membrane-like structure in human skin equivalents
Laminin 511 E8 fragment promotes to form basement membrane-like structure in human skin equivalents Open
These results suggest that 511E8 effected on HFKs, enhancing the production of BM components and strengthening the anchoring between the Col-I gels and the HFK layers.
View article: Simultaneous determination of picomolar level of dissolved silver with other key trace metals in seawater samples using solid phase extraction and isotope dilution methods
Simultaneous determination of picomolar level of dissolved silver with other key trace metals in seawater samples using solid phase extraction and isotope dilution methods Open
Simultaneous determination of dissolved silver (dAg) with other key GEOTRACES trace metals is difficult because dAg in seawater tends to form negatively charged chloride species that result in only 75% recovery efficiency with commonly use…
View article: Functions of extracellular polymeric substances in partitioning suspended and sinking particles in the upper oceans of two open ocean systems
Functions of extracellular polymeric substances in partitioning suspended and sinking particles in the upper oceans of two open ocean systems Open
Marine particle dynamics and carbon export, involving extracellular polymeric substances (EPS) like transparent exopolymer particles (TEP) and Coomassie Brilliant Blue‐stained particles (CSP), are poorly understood. Although TEP adhesive p…
View article: Taxon-specific contributions of microeukaryotes to biological carbon pump in the Oyashio region
Taxon-specific contributions of microeukaryotes to biological carbon pump in the Oyashio region Open
Microeukaryotes are critical components of sinking particles contributing to carbon export from the surface to deep oceans. However, the knowledge of the sinking microeukaryotic communities and their dynamics is currently limited. In this …
View article: The Pathophysiology of Gilles de la Tourette Syndrome: Changes in Saccade Performance by Low-Dose L-Dopa and Dopamine Receptor Blockers
The Pathophysiology of Gilles de la Tourette Syndrome: Changes in Saccade Performance by Low-Dose L-Dopa and Dopamine Receptor Blockers Open
Aim: To elucidate the pathophysiology of Gilles de la Tourette syndrome (GTS), which is associated with prior use of dopamine receptor antagonists (blockers) and treatment by L-Dopa, through saccade performance. Method: In 226 male GTS pat…
View article: Characterization of sinking and suspended microeukaryotic communities in spring Oyashio waters
Characterization of sinking and suspended microeukaryotic communities in spring Oyashio waters Open
Microeukaryotes are important components of sinking particles contributing to carbon export from the surface to deep oceans. The knowledge of the sinking microeukaryotic communities and their dynamics is limited. We applied 18S rDNA metaba…
View article: Probe capture enrichment sequencing of<i>amoA</i>genes discloses diverse ammonia-oxidizing archaeal and bacterial populations
Probe capture enrichment sequencing of<i>amoA</i>genes discloses diverse ammonia-oxidizing archaeal and bacterial populations Open
The ammonia monooxygenase subunit A ( amoA ) gene has been used to investigate the phylogenetic diversity, spatial distribution, and activity of ammonia-oxidizing archaeal (AOA) and bacterial (AOB), which contribute significantly to the ni…
View article: Bacterial surface roughness regulates nanoparticle scavenging in seawater
Bacterial surface roughness regulates nanoparticle scavenging in seawater Open
Organic nanoparticles are abundant in marine environments and constitute important nutrient sources for bacteria. Bacteria have evolved cell surfaces over 3.8 billion years to efficiently utilize food particles, and they contribute to mate…
View article: Temporal and regional variabilities in the attenuation of sinking particulate organic carbon in the Kuroshio region
Temporal and regional variabilities in the attenuation of sinking particulate organic carbon in the Kuroshio region Open
The biological pump that transports carbon from the surface ocean to the ocean interior is an important determinant of ocean carbon absorption from the atmosphere, and of biological activity beneath the euphotic zone. Various factors influ…
View article: Seasonal Cycle of the Confluence of the Tsugaru Warm, Oyashio, and Kuroshio Currents East of Japan
Seasonal Cycle of the Confluence of the Tsugaru Warm, Oyashio, and Kuroshio Currents East of Japan Open
The Sanriku Confluence east of Japan is the region of confluence of the Tsugaru Warm Current from the Sea of Japan, the Oyashio Current from the western subarctic gyre and the Sea of Okhotsk, and Kuroshio water that has detached from the s…
View article: Disturbed virus-bacteria dynamics in Otsuchi Bay (Japan) after the mega-earthquake and tsunami in March 2011
Disturbed virus-bacteria dynamics in Otsuchi Bay (Japan) after the mega-earthquake and tsunami in March 2011 Open
On 11 March 2011, a mega-earthquake followed by a huge tsunami hit a large area of the Pacific coast of Tohoku, Japan, and caused widespread disturbances in marine ecosystems; however, the impacts on virus-bacteria systems have not yet bee…
View article: Heterogeneity of Transparent Exopolymer Particles in a Coastal Marine Environment (Sagami Bay, Japan): Seasonal Variation and Its Possible Bacterial Causes
Heterogeneity of Transparent Exopolymer Particles in a Coastal Marine Environment (Sagami Bay, Japan): Seasonal Variation and Its Possible Bacterial Causes Open
Transparent exopolymer particles (TEPs) play important roles in the regulation of carbon and pollutant (microplastics and spilled oils) transport in marine environments; however, the factors controlling TEP dynamics in coastal systems have…
View article: Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column
Geographic Variation of Particle Size Distribution in the Kuroshio Region: Possible Causes in the Upper Water Column Open
Particle size distribution (PSD) in the ocean is a fundamental property that influences carbon export and food webs; however, PSD variation and its causes in oligotrophic oceans are not entirely clear. Here, we used Laser In-Situ Scatterin…
View article: Transparent Exopolymer Particles in Deep Oceans: Synthesis and Future Challenges
Transparent Exopolymer Particles in Deep Oceans: Synthesis and Future Challenges Open
Transparent exopolymer particles (TEP) are a class of abundant gel-like particles that are omnipresent in seawater. While versatile roles of TEP in the regulation of carbon cycles have been studied extensively over the past three decades, …
View article: Rapid-Onset Dystonia-Parkinsonism Phenotype Consistency for a Novel Variant of <i>ATP1A3</i> in Patients Across 3 Global Populations
Rapid-Onset Dystonia-Parkinsonism Phenotype Consistency for a Novel Variant of <i>ATP1A3</i> in Patients Across 3 Global Populations Open
Mutations in ATP1A3 , which encodes the α3 subunit of Na, K-ATPase, produce various neurologic and psychological disorders that are increasingly believed to be on a continuum, from severe infantile presentations to adult-onset movement dis…
View article: Pilot Study on Fish Species Composition Using Environmental DNA in Marine Sediment
Pilot Study on Fish Species Composition Using Environmental DNA in Marine Sediment Open
海洋堆積物には, そこに存在する魚類由来の環境DNAが含まれており, それらは長期間残存することが知られている。そのため, 海洋堆積物は過去の魚類相の履歴を保存していると考えられ, 堆積物中の環境DNA解析は, 水中の環境DNA解析とは異なる時間スケールでの魚類相の情報をもたらすものと期待されている。しかしながら, これまでに環境DNAを用いた魚類相のメタバーコーディング (多種同時検出) 解析を海洋堆積物に適用した例はない。そこで本研究では, 岩手県大槌湾より東日本大震災…
View article: Perceived general health in relation to oral health status in a rural Kenyan elderly population
Perceived general health in relation to oral health status in a rural Kenyan elderly population Open
Background: This study aimed to determine the present oral health status of the rural Kenyan elderly population and to investigate whether oral health status is associated with the perceived general health. Methods: A total of 131 individu…
View article: Distribution of Dimethylsulfoniopropionate Degradation Genes Reflects Strong Water Current Dependencies in the Sanriku Coastal Region in Japan: From Mesocosm to Field Study
Distribution of Dimethylsulfoniopropionate Degradation Genes Reflects Strong Water Current Dependencies in the Sanriku Coastal Region in Japan: From Mesocosm to Field Study Open
Dimethyl sulfide (DMS) is an important component of the global sulfur cycle as it is the most abundant sulfur compound that is emitted via the ocean surface to the atmosphere. Dimethylsulfoniopropionate (DMSP), the precursor of DMS, is mai…
View article: Effect of <i>EGLN1</i> Genetic Polymorphisms on Hemoglobin Concentration in Andean Highlanders
Effect of <i>EGLN1</i> Genetic Polymorphisms on Hemoglobin Concentration in Andean Highlanders Open
The physiological characteristics of Andean natives living at high altitudes have been investigated extensively, with many studies reporting that Andean highlanders have a higher hemoglobin (Hb) concentration than other highlander populati…
View article: Seasonal variability and regulation of bacterial production in a shallow eutrophic lake
Seasonal variability and regulation of bacterial production in a shallow eutrophic lake Open
The seasonal variation of bacterial production (BP) in a shallow, eutrophic Lake Kasumigaura was clarified from 2012 to 2016. During the studied period, BP fluctuated from 1.9 to 138 μ g C L −1 d −1 . There were no significant correlations…
View article: Position-dependent radiocarbon content of the macroalgae Undaria pinnatifida as an indicator of oceanographic conditions during algal growth
Position-dependent radiocarbon content of the macroalgae Undaria pinnatifida as an indicator of oceanographic conditions during algal growth Open
The radiocarbon content (∆14C) of the large brown macroalga Undaria pinnatifida was investigated as an indicator of oceanographic conditions during algal growth in Otsuchi Bay on the Pacific coast of northeastern Japan. In this region, war…
View article: Complete mitochondrial genome sequences of a deep-sea holothurian species of the genus <i>Scotoplanes</i> (Elasipodida: Elpidiidae)
Complete mitochondrial genome sequences of a deep-sea holothurian species of the genus <i>Scotoplanes</i> (Elasipodida: Elpidiidae) Open
Two complete and one near-complete mitochondrial genomes (mitogenomes) were determined for a deep-sea holothurian species of the genus Scotoplanes (Elpidiidae). Each sequence contains two ribosomal RNA genes, 22 transfer RNA genes, and 13 …