Search

Your search keyword '"Yamamoto, Tsukasa"' showing total 42 results
Start Over Author "Yamamoto, Tsukasa" Publication Year Range Last 50 years
42 results on '"Yamamoto, Tsukasa"'

1. Structural delineation and computational design of SARS-CoV-2-neutralizing antibodies against Omicron subvariants

Author

Moriyama, Saya, Anraku, Yuki, Taminishi, Shunta, Adachi, Yu, Kuroda, Daisuke, Kita, Shunsuke, Higuchi, Yusuke, Kirita, Yuhei, Kotaki, Ryutaro, Tonouchi, Keisuke, Yumoto, Kohei, Suzuki, Tateki, Someya, Taiyou, Fukuhara, Hideo, Kuroda, Yudai, Yamamoto, Tsukasa, Onodera, Taishi, Fukushi, Shuetsu, Maeda, Ken, Nakamura-Uchiyama, Fukumi, Hashiguchi, Takao, Hoshino, Atsushi, Maenaka, Katsumi, and Takahashi, Yoshimasa

Published
2023
Full Text
View/download PDF

3. Establishment of serological neutralizing tests using pseudotyped viruses for comprehensive detection of antibodies against all 18 lyssaviruses

Author

INOUE, Yusuke, primary, KAKU, Yoshihiro, additional, HARADA, Michiko, additional, ISHIJIMA, Keita, additional, KURODA, Yudai, additional, TATEMOTO, Kango, additional, VIRHUEZ-MENDOZA, Milagros, additional, NISHINO, Ayano, additional, YAMAMOTO, Tsukasa, additional, PARK, Eun-sil, additional, INOUE, Satoshi, additional, MATSUU, Aya, additional, and MAEDA, Ken, additional

Published
2024
Full Text
View/download PDF

5. High Seroprevalence of Severe Fever with Thrombocytopenia Syndrome Virus Infection among the Dog Population in Thailand

Author

Ishijima, Keita, primary, Phichitraslip, Thanmaporn, additional, Naimon, Nattakarn, additional, Ploypichai, Preeyaporn, additional, Kriebkajon, Benyapa, additional, Chinarak, Torntun, additional, Sridaphan, Jirasin, additional, Kritiyakan, Anamika, additional, Prasertsincharoen, Noppadol, additional, Jittapalapong, Sathaporn, additional, Tangcham, Kanate, additional, Rerkamnuaychoke, Worawut, additional, Kuroda, Yudai, additional, Taira, Masakatsu, additional, Tatemoto, Kango, additional, Park, Eunsil, additional, Virhuez-Mendoza, Milagros, additional, Inoue, Yusuke, additional, Harada, Michiko, additional, Yamamoto, Tsukasa, additional, Nishino, Ayano, additional, Matsuu, Aya, additional, and Maeda, Ken, additional

Published
2023
Full Text
View/download PDF

6. Pet Animals Were Infected with SARS-CoV-2 from Their Owners Who Developed COVID-19: Case Series Study

Author

Kuroda, Yudai, primary, Watanabe, Kei, additional, Yamamoto, Tsukasa, additional, Suzuki, Hiroki, additional, Park, Eun-sil, additional, Ishijima, Keita, additional, Tatemoto, Kango, additional, Virhuez-Mendoza, Milagros, additional, Inoue, Yusuke, additional, Harada, Michiko, additional, Nishino, Ayano, additional, Sekizuka, Tsuyoshi, additional, Kuroda, Makoto, additional, Fujimoto, Tsuguto, additional, Ishihara, Genki, additional, Horie, Ryo, additional, Kawamoto, Kosuke, additional, and Maeda, Ken, additional

Published
2023
Full Text
View/download PDF

7. Impact of Reinfection with SARS-CoV-2 Omicron Variants in Previously Infected Hamsters

Author

Shiwa-Sudo, Nozomi, primary, Sakai, Yusuke, additional, Iwata-Yoshikawa, Naoko, additional, Watanabe, Shinji, additional, Yamada, Souichi, additional, Kuroda, Yudai, additional, Yamamoto, Tsukasa, additional, Shirakura, Masayuki, additional, Fujisaki, Seiichiro, additional, Miyazaki, Kaya, additional, Miura, Hideka, additional, Nagata, Shiho, additional, Fukushi, Shuetsu, additional, Maeda, Ken, additional, Hasegawa, Hideki, additional, Suzuki, Tadaki, additional, and Nagata, Noriyo, additional

Published
2023
Full Text
View/download PDF

8. Structural delineation of SARS-CoV-2 broadly neutralizing antibody to Omicron subvariants including BA.4/BA.5 and BA.2.75

Author

Moriyama, Saya, primary, Anraku, Yuki, additional, Taminishi, Shunta, additional, Adachi, Yu, additional, Kuroda, Daisuke, additional, Kita, Shunsuke, additional, Higuchi, Yusuke, additional, Kotaki, Ryutaro, additional, Tonouchi, Keisuke, additional, Yumoto, Kohei, additional, Suzuki, Tateki, additional, Someya, Taiyou, additional, Fukuhara, Hideo, additional, Kuroda, Yudai, additional, Yamamoto, Tsukasa, additional, Onodera, Taishi, additional, Fukushi, Shuetsu, additional, Maeda, Ken, additional, Nakamura-Uchiyama, Fukumi, additional, Hashiguchi, Takao, additional, Hoshino, Atsushi, additional, Maenaka, Katsumi, additional, and Takahashi, Yoshimasa, additional

Published
2022
Full Text
View/download PDF

9. Different efficacies of neutralizing antibodies and antiviral drugs on SARS-CoV-2 Omicron subvariants, BA.1 and BA.2

Author

Ohashi, Hirofumi, primary, Hishiki, Takayuki, additional, Akazawa, Daisuke, additional, Kim, Kwang Su, additional, Woo, Joohyeon, additional, Shionoya, Kaho, additional, Tsuchimoto, Kana, additional, Iwanami, Shoya, additional, Moriyama, Saya, additional, Kinoshita, Hitomi, additional, Yamada, Souichi, additional, Kuroda, Yudai, additional, Yamamoto, Tsukasa, additional, Kishida, Noriko, additional, Watanabe, Shinji, additional, Hasegawa, Hideki, additional, Ebihara, Hideki, additional, Suzuki, Tadaki, additional, Maeda, Ken, additional, Fukushi, Shuetsu, additional, Takahashi, Yoshimasa, additional, Iwami, Shingo, additional, and Watashi, Koichi, additional

Published
2022
Full Text
View/download PDF

10. Impact of reinfection with SARS-CoV-2 Omicron variants in previously infected hamsters

Author

Shiwa-Sudo, Nozomi, primary, Sakai, Yusuke, additional, Iwata-Yoshikawa, Naoko, additional, Watanabe, Shinji, additional, Yamada, Souichi, additional, Kuroda, Yudai, additional, Yamamoto, Tsukasa, additional, Shirakura, Masayuki, additional, Fujisaki, Seiichiro, additional, Miyazaki, Kaya, additional, Miura, Hideka, additional, Nagata, Shiho, additional, Fukushi, Shuetsu, additional, Maeda, Ken, additional, Hasegawa, Hideki, additional, Suzuki, Tadaki, additional, and Nagata, Noriyo, additional

Published
2022
Full Text
View/download PDF

11. Prolonged SARS-CoV-2 infection associated with long-term corticosteroid use in a patient with impaired B-cell immunity

Author

Morishita, Momoko, primary, Suzuki, Manabu, additional, Matsunaga, Akihiro, additional, Ishizhima, Keishi, additional, Yamamoto, Tsukasa, additional, Kuroda, Yudai, additional, Kanno, Takayuki, additional, Tsujimoto, Yoshie, additional, Ishida, Akane, additional, Hashimoto, Masao, additional, Ishii, Satoru, additional, Takasaki, Jin, additional, Naka, Go, additional, Iikura, Motoyasu, additional, Izumi, Shinyu, additional, Suzuki, Tadaki, additional, Maeda, Ken, additional, Ishizaka, Yukihito, additional, Hojo, Masayuki, additional, and Sugiyama, Haruhito, additional

Published
2022
Full Text
View/download PDF

12. Vaccination-infection interval determines cross-neutralization potency to SARS-CoV-2 Omicron after breakthrough infection by other variants

Author

Miyamoto, Sho, primary, Arashiro, Takeshi, additional, Adachi, Yu, additional, Moriyama, Saya, additional, Kinoshita, Hitomi, additional, Kanno, Takayuki, additional, Saito, Shinji, additional, Katano, Harutaka, additional, Iida, Shun, additional, Ainai, Akira, additional, Kotaki, Ryutaro, additional, Yamada, Souichi, additional, Kuroda, Yudai, additional, Yamamoto, Tsukasa, additional, Ishijima, Keita, additional, Park, Eun-Sil, additional, Inoue, Yusuke, additional, Kaku, Yoshihiro, additional, Tobiume, Minoru, additional, Iwata-Yoshikawa, Naoko, additional, Shiwa-Sudo, Nozomi, additional, Tokunaga, Kenzo, additional, Ozono, Seiya, additional, Hemmi, Takuya, additional, Ueno, Akira, additional, Kishida, Noriko, additional, Watanabe, Shinji, additional, Nojima, Kiyoko, additional, Seki, Yohei, additional, Mizukami, Takuo, additional, Hasegawa, Hideki, additional, Ebihara, Hideki, additional, Maeda, Ken, additional, Fukushi, Shuetsu, additional, Takahashi, Yoshimasa, additional, and Suzuki, Tadaki, additional

Published
2022
Full Text
View/download PDF

20. Comparison of wiping and rinsing techniques after oral care procedures in critically ill patients during endotracheal intubation and after extubation: A prospective cross‐over trial.

Author

Muramatsu, Keita, Matsuo, Koichiro, Kawai, Yusuke, Yamamoto, Tsukasa, Hara, Yoshitaka, Shimomura, Yasuyo, Yamashita, Chizuru, and Nishida, Osamu

Subjects
ASPIRATION pneumonia, BACTERIAL growth, CRITICALLY ill, CROSSOVER trials, INTENSIVE care units, LONGITUDINAL method, MICROBIOLOGICAL techniques, PATIENTS, RESEARCH funding, STATISTICS, TOOTH care & hygiene, TONGUE, TRACHEA intubation, DATA analysis, EXTUBATION, MEDICAL suction, PREVENTION
Abstract

Aim: Endotracheal intubation of critically ill patients increases the risk of aspiration pneumonia, which can be reduced by regular oral care. However, the rinsing of the residual oral contaminants after mechanical cleaning carries the risk of aspirating the residue during the intubation period. Removing the contaminants by wiping with mouth wipes could be an alternative to rinsing with water because of no additional fluid. This study tested: (i) the amount of oral bacteria during endotracheal intubation and after extubation; and (ii) the changes in the bacterial count during oral care procedures. Methods: Thirty‐five mechanically ventilated patients in the intensive care unit were enrolled. The amount of bacteria on the dorsal tongue surface was counted before and following oral care and then after the elimination of contaminants either by rinsing with water and suctioning or by wiping with mouth wipes. The oral bacterial amount was compared statistically between the intubation and extubation status and among set time points during the oral care procedure. Results: The oral bacterial count was significantly decreased after extubation. During the oral care procedure, the oral bacterial amount was significantly lower after eliminating the contaminants either by rinsing or wiping, with no remarkable difference between the elimination techniques. Conclusions: The findings suggest that the oral bacterial amount is elevated during endotracheal intubation, which could increase the risk of aspiration pneumonia. The significant reduction in the bacterial count by wiping indicates that it might be a suitable alternative to rinsing for mechanically ventilated patients. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

33. Enhanced detection of Porcine reproductive and respiratory syndrome virusin fixed tissues by in situ hybridization following tyramide signal amplification

Author

Trang, Nguyen Thi, Hirai, Takuya, Ngan, Pham Hong, Lan, Nguyen Thi, Fuke, Naoyuki, Toyama, Keiko, Yamamoto, Tsukasa, and Yamaguchi, Ryoji

Abstract

This study evaluated the sensitivity of biotinyl–tyramide-based in situ hybridization (TISH) method by comparison with chromogenic in situ hybridization (CISH) and immunohistochemical staining (IHC) methods. This study also determined the effect of fixative and fixation time on the detection of Porcine reproductive and respiratory syndrome virus(PRRSV) in paraffin-embedded tissues. Lung samples were fixed in 4% paraformaldehyde (PFA) or 10% neutral buffered formalin (NBF) for various times before paraffin embedding. Of 30 paraffin-embedded lung samples, fixed for 1 day in 4% PFA or 10% NBF, 18 (60%) were positive for PRRSV by nested reverse transcription polymerase chain reaction (nRT-PCR). All 18 lung samples (100%) also were positive for PRRSV by TISH, but only 10 of these 18 specimens (56%) were positive for PRRSV by IHC and CISH. We demonstrated that TISH can detect PRRSV RNA in paraffin-embedded tissues after up to 90 days of fixation. PRRSV nucleic acids and antigens were better preserved in 4% PFA than in 10% NBF. Compared with CISH and IHC testing methods, TISH appeared to be more sensitive for the detection of PRRSV in paraffin-embedded tissues.

Published
2015
Full Text
View/download PDF

37. Anodic behavior of carbon, graphite and nickel in molten NH4F·HF

Author

Tojo Tetsuro, Ito Hideaki, Yamamoto Tsukasa, and Tasaka Akimasa

Subjects
Chemistry, Organic Chemistry, Inorganic chemistry, chemistry.chemical_element, Electrolyte, Electrochemistry, Biochemistry, Reference electrode, Anode, Inorganic Chemistry, Nickel, Amorphous carbon, Environmental Chemistry, Graphite, Physical and Theoretical Chemistry, Cyclic voltammetry
Abstract

The anodic reaction on a carbon, a graphite or a nickel electrode was studied in a molten NH 4 F·HF by a few kinds of electrochemical methods. Amorphous carbon, graphite and nickel were used as the anode and Pt-rod as the reference electrode. The anode gas was analyzed by both gaschromatography and infrared spectroscopy. In the case of carbon anode, the anodic polarization curves obtained by the cyclic voltammetry were devided into four regions with increasing the potential. The current density observed in region I (below ca. 2.4 V) was dependent upon the concentration of NH 4 F. In the region II (ca. 2.4 ∼ 3.4 V), the current density was also dependent upon the concentration of NH 4 F, though the (C x F)n [x > 2] film was formed on the surface of carbon. NH 4 F was fluorinated in the region III (ca. 3.4 ∼ 6.5 V) and then the gas evolved on the anode was composed of N 2 (+O 2 ), NF 3 , N 2 O, CO 2 , CF 4 and so on. In the region IV (over ca. 6.5 V), the anode effect occurred, but the peak current density at ca. 6.5 V was increased with the number of cyclic scanning. In the case of nickel anode, the anodic current was increased with the number of cyclic scanning, but the cathodic current at the potential below ca. 3.4 V was not observed in this electrolyte, unlike the behavior of nickel anode in liquid HF at O°C. From these results, it is suggested as follows: In the case of carbon anode, NH 4 F would be directly discharged on the bare carbon and the surface of carbon would be partially restored through the decomposition of (C x F)n and (CF)n films and their etching with HF in the melt, so that the use of carbon electrode is unfavorable for electrofluorination in this system. In the case of nickel anode, nickel difluoride (NiF 2 ) formed on the nickel electrode would be dissolved into the melt, and no atomic fluorine adsorbed on the surface of electrode would remain.

Published
1985

38. An outbreak of SARS-CoV-2 omicron variant and deaths of three lions in a zoo.

Author

Kuroda Y, Ozaki M, Sakai Y, Uchida-Fujii E, Hanada I, Yamamoto T, Tatemoto K, Hirata Y, Sato Y, Katano H, Nagata N, Kato H, Shimada T, Suzuki T, Nakao T, and Maeda K

Abstract

There have been reports of the transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from humans to various mammalian species. Some infected animals show clinical signs and may even die in rare cases. Outbreaks of SARS-CoV-2 have been reported in zoos where susceptible animals are bred in high population densities. However, there have been few reports of omicron variant outbreaks in zoo animals. From late 2022 to 2023, an outbreak of the SARS-CoV-2 omicron variant occurred in one Japanese zoo. A total of 24 lions were housed in the zoo; 13 of them showed respiratory symptoms, and the three oldest lions died. Molecular and histopathological analyses revealed that the deceased lions were infected with SARS-CoV-2 omicron BF.7.15. Virus-neutralization tests showed that all 21 lions were positive for antibodies against the omicron variant, but not against the delta variant. In addition, three tigers and one bear in the same or neighboring building as the lions possessed antibodies against the omicron variant. This is a very rare report on the outbreak of a SARS-CoV-2 omicron variant infection that resulted in the death of animals. This finding demonstrates the importance of continuous countermeasures to protect non-vaccinated animals from SARS-CoV-2 infection., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 The Authors.)

Published
2024
Full Text
View/download PDF

39. Surveillance of SARS-CoV-2 Infection in Rodent Populations in Tokyo, Japan.

Author

Kuroda Y, Hotta A, Taira M, Koizumi N, Tatemoto K, Park ES, Virhuez-Mendoza M, Yamamoto T, Komatsu N, Shibo K, Sasaki T, Mori Y, Watanabe K, Kiyokawa Y, Eguchi Y, Banzai A, Katahira H, Tanikawa T, and Maeda K

Abstract

The maintenance of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) among wildlife populations poses a potential risk for the emergence of novel variants. Therefore, monitoring SARS-CoV-2 infection among animals is crucial. As urban rodents live in close proximity to human habitats, there is concern that they may be a potential source of zoonoses. To examine the prevalence of SARS-CoV-2 in rodent populations, we analyzed 128 serum samples and 129 oral swabs collected from 128 brown rats (Rattus norvegicus) and 2 black rats (Rattus rattus) captured for pest control purposes in Tokyo, Japan, between May and December 2023. A virus-neutralizing test using the Omicron variant revealed no evidence of SARS-CoV-2 infection in these populations. Real-time RT-PCR from oral swabs did not detect any SARS-CoV-2 RNA-positive rats. These results indicate the low probability of SARS-CoV-2 circulation among rat populations in Tokyo.

Published
2024
Full Text
View/download PDF

40. Cross-Neutralization Activities of Antibodies against 18 Lyssavirus Glycoproteins.

Author

Inoue Y, Kaku Y, Harada M, Ishijima K, Kuroda Y, Tatemoto K, Virhuez-Mendoza M, Nishino A, Yamamoto T, Inoue S, Matsuu A, and Maeda K

Subjects
Animals, Rabbits, Humans, Rhabdoviridae Infections immunology, Rhabdoviridae Infections prevention & control, Lyssavirus immunology, Antibodies, Viral immunology, Antibodies, Viral blood, Glycoproteins immunology, Cross Reactions, Antibodies, Neutralizing immunology, Antibodies, Neutralizing blood, Neutralization Tests
Abstract

Some lyssaviruses, including the rabies virus (RABV), cause lethal neurological symptoms in humans. However, the efficacy of commercial vaccines has only been evaluated against RABV. To assess cross-reactivity among lyssaviruses, including RABV, sera from rabbits inoculated with human and animal RABV vaccines and polyclonal antibodies from rabbits immunized with expression plasmids of the glycoproteins of all 18 lyssaviruses were prepared, and cross-reactivity was evaluated via virus-neutralization tests using Duvenhage lyssavirus (DUVV), European bat lyssavirus-1 (EBLV-1), Mokola lyssavirus (MOKV), Lagos bat lyssavirus (LBV), and RABV. The sera from rabbits inoculated with RABV vaccines showed cross-reactivity with EBLV-1 and DUVV, both belonging to phylogroup I. However, reactivity with MOKV and LBV in phylogroup II was notably limited or below the detection level. Next, we compared the cross-reactivity of the polyclonal antibodies against all lyssavirus glycoproteins. Polyclonal antibodies had high virus-neutralization titers against the same phylogroup but not different phylogroups. Our findings indicate that a new vaccine should be developed for pre- and post-exposure prophylaxis against lyssaviral infections.

Published
2024
Full Text
View/download PDF

41. [Case Report; A severe Pseudomonas aeruginosa community-acquired pneumonia treated by veno-venous extracorporeal membrane oxygenation (ECMO)--a case report].

Author

Kinoshita T, Yamamoto K, Toyama S, Kuga M, Yatomi M, Yamamoto T, and Kunitomo F

Subjects
Community-Acquired Infections diagnosis, Humans, Male, Middle Aged, Pneumonia diagnosis, Pneumonia therapy, Respiratory Distress Syndrome diagnosis, Treatment Outcome, Community-Acquired Infections pathology, Community-Acquired Infections therapy, Extracorporeal Membrane Oxygenation, Pneumonia pathology, Pseudomonas aeruginosa isolation & purification, Respiratory Distress Syndrome therapy
Published
2015
Full Text
View/download PDF

42. [Usefulness of reporter gene assay for AhR agonists, CALUX assay].

Author

Kayama F and Yamamoto T

Subjects
Environmental Pollutants analysis, Humans, Biological Assay methods, Dioxins analysis, Environmental Monitoring methods, Food Analysis methods, Genes, Reporter
Abstract

The reporter gene expression method CALUX cell bioassay has proven to be a very valuable screening technique for assessing toxic equivalents of dioxin and dioxin-like compounds, because it detects all AhR ligands in a variety of sample matrices. Used with the two specially elaborated clean-up procedures, CALUX cell bioassay was established for various environmental and biological samples. Consequently, the CALUX-TEQ values are correlated with high correlation coefficiencies to WHO-TEQ values derived from HRGC/HRMS. CALUX assay has been applied to the screening and quarantine of food items with possible dioxin contaminations in the EU. In addition, the method has been applied to biological samples such as serum, breast milk and fat tissues. Several reported studies demonstrated that CALUX cell assay is a useful tool and applicable in human epidemiological studies. We need to establish multi-national comparative studies in the field of dioxin contamination.

Published
2005
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results