Search results for: Hiroshi Yamamoto

Items from 1 to 20 out of 583 results

article

Critical role of cyclic electron transport around photosystem I in the maintenance of photosystem I activity

Ryouhei Kobayashi, Hiroshi Yamamoto, Kota Ishibashi, Toshiharu Shikanai

The Plant Journal > 118 > 6 > 2141 - 2153

In angiosperms, cyclic electron transport around photosystem I (PSI) is mediated by two pathways that depend on the PROTON GRADIENT REGULATION 5 (PGR5) protein and the chloroplast NADH dehydrogenase‐like (NDH) complex, respectively. In the Arabidopsis double mutants defective in both pathways, plant growth and photosynthesis are impaired. The pgr5‐1 mutant used in the original study is a missense...

article

Comparing 10‐ and 28‐Day Sediment Toxicity and Bioaccumulation of Fluoranthene in Hyalella azteca Using Passive Sampling Techniques

Takahiro Nishimori, Kyoshiro Hiki, Fabian Christoph Fischer, Satoshi Endo, more

Environmental Toxicology and Chemistry > 41 > 11 > 2679 - 2687

Understanding the changes in the temporal and spatial concentrations of chemical substances in sediment toxicity tests facilitates interpretation of their toxicity and accumulation in benthic organisms because benthic organisms are affected by chemicals via multiple exposure pathways. However, such investigations using chronic sediment toxicity tests have rarely been performed. To examine the concentration...

article

Enhanced strategy against mediastinitis with thoracic vascular graft infection: A combination of hydro‐debridement with pulsed lavage and negative pressure wound therapies

Daichi Takagi, Takuya Wada, Wataru Igarashi, Takayuki Kadohama, more

Journal of Cardiac Surgery > 37 > 9 > 2741 - 2744

Background We investigated the effects of hydrodebridement with pulsed lavage (HDPL) and negative pressure (NP) wound therapies, instead of excising the prosthetic graft, in patients with postoperative thoracic vascular graft infection (TVGI). Methods Between 2020 and 2021, five TVGI patients aged 49.6 ± 19.4 years old underwent a combined therapy of HDPL and NP. The patients underwent a two‐step...

article

Effects of wood kraft pulp as a partial replacement for roughage on rumen fermentation and productivity in dairy cows

Hiroshi Yamamoto, Yasuhiro Shimizu, Toshiya Hasunuma, Noriyoshi Manabe, more

Animal Science Journal > 93 > 1 > n/a - n/a

In this study, we evaluated the partial replacement of roughage with wood kraft pulp (KP) on rumen fermentation and productivity of dairy cows. Eighteen cows were divided into control and KP groups. The KP group started adaptation to KP 3 weeks before calving; after calving, they were fed a total mixed ration for 12 weeks, wherein 18% Timothy hay was replaced with KP. The dry matter intake, body weight,...

article

Severity Classification of Clinical Signs and Defining the Moribund State as an Experimental Endpoint for Acute Toxicity Testing Using Japanese Medaka (Oryzias latipes)

Takahiro Yamagishi, Machi Kawano, Haruna Watanabe, Ayano Yagi, more

Environmental Toxicology and Chemistry > 41 > 4 > 1089 - 1095

Use of the moribund state as an endpoint for acute toxicity testing in fish is complicated by the lack of consensus about the sublethal signs that define the state or that can predict imminent death. Defining the moribund state in fish requires determination of the association between each observable sublethal sign and transition to imminent death. To establish a criterion for defining the moribund...

article

Comparison of Species Sensitivity Distributions for Sediment‐Associated Nonionic Organic Chemicals Through Equilibrium Partitioning Theory and Spiked‐Sediment Toxicity Tests with Invertebrates

Kyoshiro Hiki, Yuichi Iwasaki, Haruna Watanabe, Hiroshi Yamamoto

Environmental Toxicology and Chemistry > 41 > 2 > 462 - 473

Equilibrium partitioning (EqP) theory and spiked‐sediment toxicity tests are useful methods to develop sediment quality benchmarks. However, neither approach has been directly compared based on species sensitivity distributions (SSDs) to date. In the present study, we compared SSDs for 10 nonionic hydrophobic chemicals (e.g., pyrethroid insecticides, other insecticides, and polycyclic aromatic hydrocarbons)...

article

Spatiotemporal Distribution of Hydrophobic Organic Contaminants in Spiked‐Sediment Toxicity Tests: Measuring Total and Freely Dissolved Concentrations in Porewater and Overlying Water

Kyoshiro Hiki, Fabian Christoph Fischer, Takahiro Nishimori, Haruna Watanabe, more

Environmental Toxicology and Chemistry > 40 > 11 > 3148 - 3158

The sediment–water interface of spiked‐sediment toxicity tests is a complex exposure system, where multiple uptake pathways exist for benthic organisms. The freely dissolved concentration (C_free) in sediment porewater has been proposed as a relevant exposure metric to hydrophobic organic contaminants (HOCs) in this system. However, C_free has rarely been measured in spiked‐sediment toxicity tests....

article

Endovascular rescue for malpositioned frozen elephant trunk into the false lumen

Daichi Takagi, Takuya Wada, Wataru Igarashi, Takayuki Kadohama, more

Journal of Cardiac Surgery > 36 > 10 > 3948 - 3951

We describe a case of frozen elephant trunk deployment unintentionally malpositioned into the false lumen. An 83‐year‐old man underwent total arch repair with a frozen elephant trunk for type A acute aortic dissection complicated by mesenteric malperfusion. However, intraoperative transesophageal echocardiography showed expansion of the false lumen in the descending aorta, suggesting a malpositioned...

article

Cooperation of chloroplast ascorbate peroxidases and proton gradient regulation 5 is critical for protecting Arabidopsis plants from photo‐oxidative stress

Takashi Kameoka, Takaya Okayasu, Kana Kikuraku, Takahisa Ogawa, more

The Plant Journal > 107 > 3 > 876 - 892

High‐light (HL) stress enhances the production of H₂O₂ from the photosynthetic electron transport chain in chloroplasts, potentially causing photo‐oxidative damage. Although stromal and thylakoid membrane‐bound ascorbate peroxidases (sAPX and tAPX, respectively) are major H₂O₂‐scavenging enzymes in chloroplasts, their knockout mutants do not exhibit a visible phenotype under HL stress. Trans‐thylakoid...

article

Sources of variation in sediment toxicity of hydrophobic organic chemicals: Meta‐analysis of 10–14‐day spiked‐sediment tests with Hyalella azteca and Chironomus dilutus

Kyoshiro Hiki, Haruna Watanabe, Hiroshi Yamamoto

Integrated Environmental Assessment and Management > 17 > 5 > 1003 - 1013

Spiked‐sediment toxicity tests with benthic organisms are routinely used to assess the potential ecological impact of sediment‐associated hydrophobic organic contaminants. Although several sediment tests have been standardized, experimental factors such as spiking methods still vary between laboratories. To identify the experimental factors that affect the bioavailability of contaminants and account...

article

Right coronary ostium occlusion by aortic valve tumor during systole

Wataru Igarashi, Takuya Wada, Daichi Takagi, Takayuki Kadohama, more

Journal of Cardiac Surgery > 36 > 9 > 3393 - 3395

Here, we present a case of acute myocardial infarction caused by an aortic valve tumor. Electrocardiography (ECG)‐gated four‐dimensional computed tomography revealed obstruction of the right coronary ostium by a mobile mass during systole. To ensure an accurate diagnosis of angina in patients without significant coronary artery disease, ECG‐gated four‐dimensional computed tomography is useful because...

article

Ruptured type A aortic dissection with saddle pulmonary embolism‐like appearance on computed tomography angiography

Takuya Wada, Shingo Ohuchi, Shogo Oyama, Daichi Takagi, more

Journal of Cardiac Surgery > 36 > 9 > 3376 - 3377

We present a case of ruptured type A acute aortic dissection with pulmonary trunk compression by mediastinal hematoma. This condition mimicked a pulmonary embolism on the early arterial phase of computed tomography angiography, whereas the correct diagnosis was determined from the late arterial phase and unenhanced computed tomography. We highlight the importance of carefully interpreting triphasic...

article

Efficacy and safety of cold forceps biopsy for diminutive pharyngeal neoplasms: Single‐center, prospective pilot study

Yuichi Shimodate, Junya Itakura, Tomohiko Sunami, Masayuki Ueno, more

Digestive Endoscopy > 33 > 5 > 761 - 769

Background Management of diminutive pharyngeal neoplasms is controversial. Thus, we conducted a single‐center, prospective pilot study to investigate the efficacy and safety of endoscopic excision with cold forceps biopsy (CFB) of these lesions. Patients and Methods Thirty‐nine lesions endoscopically diagnosed with narrow‐band imaging as pharyngeal neoplasms of 3 mm or smaller were excised with...

article

Double ligation is useful to prevent recurrence for paediatric inguinal hernia in the laparoscopic percutaneous extraperitoneal closure procedure

Go Ohba, Ryo Takahashi, Naoki Okada, Masashi Minato, more

Surgical Practice > 25 > 2 > 88 - 91

Aim Although laparoscopic percutaneous extraperitoneal closure (LPEC) is the standard procedure for paediatric inguinal hernia repair in our country, recurrence is an important problem. In this study, we examined the usefulness of double ligation in preventing recurrence in the LPEC procedure. Methods We retrospectively examined children with inguinal hernias who underwent the LPEC procedure. Cases...

article

Multiple graft injury due to migrated nonbroken sternal wires 2 years after cardiac surgery

Takayuki Kadohama, Daichi Takagi, Takeshi Arai, Hiroshi Yamamoto

Journal of Cardiac Surgery > 35 > 7 > 1640 - 1641

The migration of sternal wires into vital structures is a rare but potentially life‐threatening complication and associated with infection in some cases. While a few cases have been reported the sternal wires were broken in those cases. To our knowledge, this is the first report of multiple, nonbroken, migrated sternal wires stabbing vascular grafts.

article

Differential heavy metal sensitivity in seven algal species from the NIES culture collection based on delayed fluorescence assays

Shuhei Ota, Haruyo Yamaguchi, Faustine Vanel, Shigeshi Fuchida, more

Phycological Research > 68 > 1 > 41 - 49

Seafloor massive sulfide (SMS) deposits are the target of available metallic resources. The toxic impacts of leachable metals from hydrothermal ore by mining operations in marine environments are a concern. However, ecotoxicological knowledge about marine algae, and particularly open ocean species, is still limited. Here, we evaluated the toxic effects of three leachable metals (i.e. Zn, Cu, and Pb)...

article

Diastereoconvergent Dehydrative Nucleophilic Substitutions of Diastereomeric Diarylmethanols with 1,3‐Dicarbonyls Catalyzed by SnBr₄

Rikiya Kubo, Hiroshi Yamamoto, Kenya Nakata

European Journal of Organic Chemistry > 2019 > 44 > 7394 - 7398

Diastereoconvergent direct dehydrative nucleophilic substitutions of diastereomeric mixtures of diarylmethanols with 1,3‐dicarbonyls in the presence of SnBr₄ as a Lewis acid catalyst are reported. Excellent diastereoselectivities and high yields were achieved by using a chiral auxiliary. The reaction proved applicable to a wide range of substrates, irrespective of aromatic ring substituents tested,...

article

Potential prognostic implications of myocardial thallium-201 and iodine-123-beta-methylpentadecanoic acid dual scintigraphy in patients with Anderson–Fabry disease

Tomoaki Haga, Takahiro Okumura, Satoshi Isobe, Fuji Somura, more

Annals of Nuclear Medicine > 2019 > 33 > 12 > 930-936

Objectives Information on the relationship between myocardial damage assessed by myocardial scintigraphy and prognosis in patients with Anderson–Fabry disease (AFD) is lacking. We therefore aimed to investigate the prognostic impacts of myocardial thallium-201 (²⁰¹Tl) and iodine-123 beta-methyl 15-para-iodophenyl 3(R, S)-methylpentadecanoic acid (¹²³I-BMIPP) dual scintigraphy in patients with AFD...

article

Post-polypectomy bleeding in hot-snare polypectomy of colonic polyps under continued warfarin or short interruption of direct oral anticoagulants

Yuichi Shimodate, Masayuki Ueno, Tomohiko Sunami, Hiroshi Takayama, more

International Journal of Colorectal Disease > 2019 > 34 > 10 > 1705-1712

Background Newly published guidelines of the Japanese Gastroenterological Endoscopy Society (JGES) suggest to consider endoscopic procedures with high risk of bleeding without stopping warfarin and with stopping direct oral anticoagulants (DOACs) only on the day of the procedure. In this study, we aimed to test the validity of these recommendations. Patients and methods We retrospectively reviewed...

article

Comparative study of the inhibitory effect on bone erosion progression with denosumab treatment and conventional treatment in rheumatoid arthritis patients: study protocol for an open-label randomized controlled trial by HR-pQCT

Naoki Iwamoto, Shuntaro Sato, Remi Sumiyoshi, Ko Chiba, more

Trials > 2019 > 20 > 1 > 1-8

Background Rheumatoid arthritis (RA) is a chronic inflammatory disease of the joints, causes joint destruction, and leads to physical disability. Advances in the treatment of RA, such as biologic disease-modifying anti-rheumatic drugs (DMARDs), have provided better clinical outcomes, including the achievement of remission for patients with RA, but some patients cannot receive these treatments because...

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INFONA - science communication portal

Search results for: Hiroshi Yamamoto

Critical role of cyclic electron transport around photosystem I in the maintenance of photosystem I activity

Comparing 10‐ and 28‐Day Sediment Toxicity and Bioaccumulation of Fluoranthene in Hyalella azteca Using Passive Sampling Techniques

Enhanced strategy against mediastinitis with thoracic vascular graft infection: A combination of hydro‐debridement with pulsed lavage and negative pressure wound therapies

Effects of wood kraft pulp as a partial replacement for roughage on rumen fermentation and productivity in dairy cows

Severity Classification of Clinical Signs and Defining the Moribund State as an Experimental Endpoint for Acute Toxicity Testing Using Japanese Medaka (Oryzias latipes)

Comparison of Species Sensitivity Distributions for Sediment‐Associated Nonionic Organic Chemicals Through Equilibrium Partitioning Theory and Spiked‐Sediment Toxicity Tests with Invertebrates

Spatiotemporal Distribution of Hydrophobic Organic Contaminants in Spiked‐Sediment Toxicity Tests: Measuring Total and Freely Dissolved Concentrations in Porewater and Overlying Water

Endovascular rescue for malpositioned frozen elephant trunk into the false lumen

Cooperation of chloroplast ascorbate peroxidases and proton gradient regulation 5 is critical for protecting Arabidopsis plants from photo‐oxidative stress

Sources of variation in sediment toxicity of hydrophobic organic chemicals: Meta‐analysis of 10–14‐day spiked‐sediment tests with Hyalella azteca and Chironomus dilutus

Right coronary ostium occlusion by aortic valve tumor during systole

Ruptured type A aortic dissection with saddle pulmonary embolism‐like appearance on computed tomography angiography

Efficacy and safety of cold forceps biopsy for diminutive pharyngeal neoplasms: Single‐center, prospective pilot study

Double ligation is useful to prevent recurrence for paediatric inguinal hernia in the laparoscopic percutaneous extraperitoneal closure procedure

Multiple graft injury due to migrated nonbroken sternal wires 2 years after cardiac surgery

Differential heavy metal sensitivity in seven algal species from the NIES culture collection based on delayed fluorescence assays

Diastereoconvergent Dehydrative Nucleophilic Substitutions of Diastereomeric Diarylmethanols with 1,3‐Dicarbonyls Catalyzed by SnBr₄

Potential prognostic implications of myocardial thallium-201 and iodine-123-beta-methylpentadecanoic acid dual scintigraphy in patients with Anderson–Fabry disease

Post-polypectomy bleeding in hot-snare polypectomy of colonic polyps under continued warfarin or short interruption of direct oral anticoagulants

Comparative study of the inhibitory effect on bone erosion progression with denosumab treatment and conventional treatment in rheumatoid arthritis patients: study protocol for an open-label randomized controlled trial by HR-pQCT

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