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  1. Article ; Online: Effect of early oseltamivir on outpatients without hypoxia with suspected COVID-19.

    Chiba, Satoru

    Wiener klinische Wochenschrift

    2020  Volume 133, Issue 7-8, Page(s) 292–297

    Abstract: Background: Since December 2019 coronavirus disease 2019 (COVID-19) outbreaks have occurred in China and many countries around the world. The effectiveness of oseltamivir on COVID-19 suspected outpatients without hypoxia was evaluated.: Methods: A ... ...

    Abstract Background: Since December 2019 coronavirus disease 2019 (COVID-19) outbreaks have occurred in China and many countries around the world. The effectiveness of oseltamivir on COVID-19 suspected outpatients without hypoxia was evaluated.
    Methods: A total of 16 COVID-19 suspected medical personnel and their cohabitation families without hypoxia, who came to the adult fever clinic from March to June 2020 were studied. All patients received antiviral therapy (oseltamivir) and antibacterial therapy together.
    Results: Most of the infected patients were female (10, 63%), 1 had diabetes (6%) and 3 hypertension (19%). The median age was 45 years (interquartile range [IQR] 31-60 years). Oseltamivir administration made the temperature fall within 24 h in part (10, 63%). Clinical data were compared between patients receiving early treatment (ET) with oseltamivir, initiated within 24 h, and patients administered late treatment (LT), initiated after this time point. Duration of fever was shorter in the ET group than in the LT group (31 ± 21 h versus 94 ± 38 h; p < 0.001). The time from fever onset to treatment initiation correlated with duration of fever (r = 0.77; p < 0.001) and the time from peak to decline (r = 0.58; p < 0.05).
    Conclusion: These findings suggest that early oseltamivir administration may lower the duration of fever in COVID-19 suspected outpatients without hypoxia when it is used in combination with antibacterial therapy.
    MeSH term(s) Adult ; Antiviral Agents/adverse effects ; COVID-19 ; China/epidemiology ; Female ; Humans ; Hypoxia/diagnosis ; Hypoxia/drug therapy ; Influenza, Human/diagnosis ; Influenza, Human/drug therapy ; Influenza, Human/epidemiology ; Male ; Middle Aged ; Oseltamivir/therapeutic use ; Outpatients ; SARS-CoV-2
    Chemical Substances Antiviral Agents ; Oseltamivir (20O93L6F9H)
    Language English
    Publishing date 2020-12-09
    Publishing country Austria
    Document type Journal Article
    ZDB-ID 200462-8
    ISSN 1613-7671 ; 0043-5325 ; 0300-5178
    ISSN (online) 1613-7671
    ISSN 0043-5325 ; 0300-5178
    DOI 10.1007/s00508-020-01780-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Keigai-rengyo-to as post-exposure prophylaxis for severe acute respiratory syndrome coronavirus 2 infection.

    Chiba, Satoru / Shinohara, Kaoru

    Respiratory investigation

    2023  Volume 61, Issue 6, Page(s) 669–674

    Abstract: Background: Effective prevention against COVID-19 is urgently required to control vaccine breakthrough infection. Laboratory and clinical data suggested that Keigai-rengyo-to (KRT) performs biological activity against severe acute respiratory syndrome ... ...

    Abstract Background: Effective prevention against COVID-19 is urgently required to control vaccine breakthrough infection. Laboratory and clinical data suggested that Keigai-rengyo-to (KRT) performs biological activity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We investigated whether KRT could prevent SARS-CoV-2 in medical personnel exposed to patients with COVID-19.
    Methods: We conducted an open-label controlled clinical trial of medical personnel after COVID-19 vaccination at our hospital (ClinicalTrials.gov: UMIN000048389). Participants were close contacts recently exposed (<72 h) to patients with COVID-19. We provided the participants with KRT (7.5 g/day for 5 days) or no drug as a control. The primary endpoint was nicking endonuclease amplification reaction or polymerase chain reaction confirming incident SARS-CoV-2 infection. Safety was assessed in all treated participants.
    Results: Between January and September 2022, 38 close contacts were assigned: 20 to the KRT group and 18 to the control group. During 2 weeks of follow-up, 10/38 (26%) participants had new-onset COVID-19. The incidence of COVID-19 was significantly lower in the KRT group (2/20; 10%) than in the control group (8/18; 44%), with a medium effect size (p < 0.05; phi coefficient = -0.391; total absolute risk reduction: 34.4% points). The number needed to treat to prevent the occurrence of a COVID-19 case was 2.9. The overall relative risk was 0.23 (95% confidence interval: 0.06-0.78). No serious safety problems were detected.
    Conclusion: Post-exposure prophylaxis with KRT can prevent the onset of COVID-19 in close contacts after vaccination. More randomized clinical trials with larger samples are required to better evaluate KRT as a post-exposure prophylaxis of SARS-CoV-2.
    MeSH term(s) Humans ; COVID-19/prevention & control ; COVID-19 Vaccines ; Post-Exposure Prophylaxis ; SARS-CoV-2
    Chemical Substances COVID-19 Vaccines ; keigai-rengyo-to
    Language English
    Publishing date 2023-09-12
    Publishing country Netherlands
    Document type Controlled Clinical Trial ; Journal Article
    ZDB-ID 2660821-2
    ISSN 2212-5353 ; 2212-5345
    ISSN (online) 2212-5353
    ISSN 2212-5345
    DOI 10.1016/j.resinv.2023.07.004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Restoration of the Functional nif Gene Cluster by Complex Recombination Events during Heterocyst Development in the Nitrogen-Fixing Cyanobacterium Calothrix sp. NIES-4101.

    Uesaka, Kazuma / Banba, Mari / Chiba, Sotaro / Fujita, Yuichi

    Plant & cell physiology

    2024  

    Abstract: In the genome of the heterocystous cyanobacterium Calothrix sp. NIES-4101 (NIES-4101), the four genes essential for nitrogen fixation (nifB, nifH, nifD, and nifK) are highly fragmented into 13 parts in a 350-kb chromosomal region, and four of these parts ...

    Abstract In the genome of the heterocystous cyanobacterium Calothrix sp. NIES-4101 (NIES-4101), the four genes essential for nitrogen fixation (nifB, nifH, nifD, and nifK) are highly fragmented into 13 parts in a 350-kb chromosomal region, and four of these parts are encoded in the reverse strand. Such a complex fragmentation feature makes it difficult to restore the intact nifBHDK genes by the excision mechanism found in the nifD gene of the Anabaena sp. PCC 7120 heterocyst. To examine the nitrogen-fixing ability of NIES-4101, we confirmed that NIES-4101 grew well on combined nitrogen-free medium and showed high nitrogenase activity, which strongly suggested that the complete nifBHDK genes are restored by a complex recombination process in heterocysts. Next, we resequenced the genome prepared from cells grown under nitrogen-fixing conditions. Two contigs covering the complete nifHDK and nifB genes were found by de novo assembly of the sequencing reads. In addition, DNA fragments covering the nifBHDK operon were successfully amplified by PCR. We propose that the process of nifBHDK restoration occurs as follows. First, the nifD-nifK genes are restored by four excision events. Then the complete nifH and nifB genes are restored by two excision events followed by two successive inversion events between the inverted repeat sequences and one excision event, forming the functional nif gene cluster, nifB-fdxN-nifS-nifU-nifH-nifD-nifK. All genes coding recombinases responsible for these nine recombination events are located close to the terminal repeat sequences. The restoration of the nifBHDK genes in NIES-4101 is the most complex genome reorganization reported in heterocystous cyanobacteria.
    Language English
    Publishing date 2024-02-02
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 208907-5
    ISSN 1471-9053 ; 0032-0781
    ISSN (online) 1471-9053
    ISSN 0032-0781
    DOI 10.1093/pcp/pcae011
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: [Conflict of interest management in the Japanese Society of Hematology].

    Chiba, Shigeru

    Rinsho ketsueki] The Japanese journal of clinical hematology

    2019  Volume 60, Issue 9, Page(s) 1366–1371

    Abstract: A conflict of interest (COI) is a conflict between private interests and one's official responsibilities. COI is unavoidable and thus needs to be managed. Debates about COI in medical research area began in the United States in the 1980s. COI clause was ... ...

    Abstract A conflict of interest (COI) is a conflict between private interests and one's official responsibilities. COI is unavoidable and thus needs to be managed. Debates about COI in medical research area began in the United States in the 1980s. COI clause was added to the Helsinki Declaration in the year of 2000 after the Gelsinger affair. Discussions in Japan subsequently followed, and COI management guidelines have been sequentially presented by different organizations, particularly after the Diovan incident in 2013. Guidelines presented by the Japan Medical Association (JMA) in 2017 are currently regarded as standard. COI disclosure is required at research presentations and medical practice guideline announcements, among others, and should be carefully managed in the latter. In 2018, the Japanese Society of Hematology announced revision of the Japanese Society of Internal Medicine common guidance, presenting it in accordance with the JMA's guidelines. In the "Specific Clinical Research" section defined in the "Clinical Research Method Enforcement Rule", people who should not take a representative position or who should pay special attention when taking it are defined.
    MeSH term(s) Conflict of Interest ; Disclosure ; Hematology/standards ; Japan ; Societies, Medical/standards
    Language Japanese
    Publishing date 2019-10-09
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 390900-1
    ISSN 0485-1439
    ISSN 0485-1439
    DOI 10.11406/rinketsu.60.1366
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Clarification of Psychiatric Nurses' Intentions and Analysis Contents in Observing Schizophrenia Patient.

    Chiba, Shinichi / Tomotake, Masahito / Tsutsumi, Rie

    The journal of medical investigation : JMI

    2024  Volume 71, Issue 1.2, Page(s) 54–61

    Abstract: The purpose of this study was to clarify what psychiatric nurses intended to observe when observing schizophrenia patient and what they analyzed from their observations. Twenty-one experienced nurses were included in the study. Data were collected ... ...

    Abstract The purpose of this study was to clarify what psychiatric nurses intended to observe when observing schizophrenia patient and what they analyzed from their observations. Twenty-one experienced nurses were included in the study. Data were collected through semi-structured interviews, and content analysis was conducted. The results were as follows:Nurses' intentions in observing patient were [Observation of psychiatric symptoms], [Observation of normality or abnormality], [Possibility of self-harm or harming others], [Side effects of antipsychotics], [Degree of communication disorder], [Degree of self-care], [Observation of nutritional status], [Effects of external stimuli on patient], and [Less importance of observing doctor]. Nurses' analysis contents were [Analysis of psychiatric symptoms], [No risk of self-harm or harming others], [Effects of antipsychotics], [Presence of communication disorder], [Lack of trust in doctor], [Problems in daily life], [Consideration of future nursing intervention], [Assessment of normality or abnormality], [Unhealthy physical state], and [Unnecessary analysis]. The results of this study revealed the nurses' observational process. J. Med. Invest. 71 : 54-61, February, 2024.
    MeSH term(s) Humans ; Schizophrenia ; Psychiatric Nursing ; Female ; Adult ; Male ; Intention ; Middle Aged
    Language English
    Publishing date 2024-05-11
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 1435233-3
    ISSN 1349-6867 ; 1343-1420
    ISSN (online) 1349-6867
    ISSN 1343-1420
    DOI 10.2152/jmi.71.54
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Collective Synthesis of Highly Oxygenated (Furano)germacranolides Derived from Elephantopus mollis and Elephantopus tomentosus.

    Patouret, Rémi / Cham, Ning / Chiba, Shunsuke

    Angewandte Chemie (International ed. in English)

    2024  Volume 63, Issue 19, Page(s) e202402050

    Abstract: Germacranolides, secondary metabolites produced by plants, have garnered academic and industrial interest due to their diverse and complex topology as well as a wide array of pharmacological activities. Molephantin, a highly oxygenated germacranolide ... ...

    Abstract Germacranolides, secondary metabolites produced by plants, have garnered academic and industrial interest due to their diverse and complex topology as well as a wide array of pharmacological activities. Molephantin, a highly oxygenated germacranolide isolated from medicinal plants, Elephantopus mollis and Elephantopus tomentosus, has exhibited antitumor, inflammatory, and leishmanicidal activities. Its chemical structure is based on a highly strained ten-membered macrocyclic backbone with an (E,Z)-dienone moiety, which is fused with an α-methylene-γ-butyrolactone and adorned with four successive stereogenic centers. Herein, we report the first synthesis of molephantin in 12 steps starting from readily available building blocks. The synthesis features the highly diastereoselective intermolecular Barbier allylation of the β,γ-unsaturated aldehyde with optically active 3-bromomethyl-5H-furan-2-one intermediate and ensuing Nozaki-Hiyama-Kishi (NHK) macrocyclization for the construction of the highly oxygenated ten-membered macrocyclic framework. This synthetic route enabled access to another germacranolide congener, tomenphantopin F. Furthermore, cycloisomerization of molephantin into 2-deethoxy-2β-hydroxyphantomolin could be facilitated by irradiation with ultraviolet A light (λ
    MeSH term(s) Oxygen/chemistry ; Asteraceae/chemistry ; Stereoisomerism ; Sesquiterpenes, Germacrane/chemistry ; Sesquiterpenes, Germacrane/chemical synthesis ; Furans/chemistry ; Furans/chemical synthesis ; Molecular Structure
    Chemical Substances Oxygen (S88TT14065) ; germacranolide ; Sesquiterpenes, Germacrane ; Furans
    Language English
    Publishing date 2024-04-05
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202402050
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Innovative power generator using dielectric elastomers (creating the foundations of an environmentally sustainable society)

    Chiba, S / Waki, M

    Sustainable chemistry and pharmacy. 2020 Mar., v. 15

    2020  

    Abstract: Power generation using dielectric elastomer (DE) artificial muscle has attracted attention because it is light-weight, low-cost and high-efficiency. This method generates carbon dioxide-free electric power without exhausting rare earth materials or ... ...

    Abstract Power generation using dielectric elastomer (DE) artificial muscle has attracted attention because it is light-weight, low-cost and high-efficiency. This method generates carbon dioxide-free electric power without exhausting rare earth materials or contributing to global warming, earning it the status of an eco-friendly system.This paper considers the opportunities for a DE generator system, namely using them to create the foundations of a Recycling Energy Society. If these opportunities are to be commercially successful, they will have to leverage the DE's advantages over conventional technologies. In this paper, we discuss two ways to use DEs more practically in applications: 1) point power generation, in which a single DE is used alone, and 2) distributed power generation, in which a large number of DEs are gathered as one cluster and distributed. We will also discuss the current status and future of DE generators.
    Keywords carbon dioxide ; generators (equipment) ; global warming ; green chemistry ; muscles ; power generation ; sustainable communities
    Language English
    Dates of publication 2020-03
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 2352-5541
    DOI 10.1016/j.scp.2019.100205
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: [Biomarkers predicting the efficacy of DNA hypomethylating agents in the treatment of myelodysplastic syndromes and acute myeloid leukemia: TET enzymes].

    Chiba, Shigeru

    Rinsho ketsueki] The Japanese journal of clinical hematology

    2018  Volume 59, Issue 5, Page(s) 594–601

    Abstract: Azacitidine (AZA), a hypomethylating agent, is widely used in patients with high-risk (HR) myelodysplastic syndromes (MDS). AZA is also believed to aid in the treatment of acute myeloid leukemia (AML). In randomized clinical trials for MDS, major and ... ...

    Abstract Azacitidine (AZA), a hypomethylating agent, is widely used in patients with high-risk (HR) myelodysplastic syndromes (MDS). AZA is also believed to aid in the treatment of acute myeloid leukemia (AML). In randomized clinical trials for MDS, major and overall response rates for AZA alone were 16-33% and 38-60%, respectively. In the AZA-001 trial, the median overall survival (OS) for the AZA group was >24 months compared to 15 months for the control. However, other clinical trials have reported OS periods of 15-21 months, while population-based studies have reported OS rates much shorter than 20 months. Only a fraction of HR-MDS patients appears to benefit from AZA treatment. Furthermore, despite its low-intensity nature, the risk may outweigh the benefit in a significant proportion of patients; therefore, the indication of AZA should be reconsidered if good biomarkers that predict its efficacy are discovered. The response rate to AZA was moderately higher in MDS patients with TET2 mutations than in those without the mutations. Recently, increasing attention has been paid to a report, according to which, majority of the patients with TP53 mutations showed good response to a higher dose of decitabine. The use of AZA and the biomarkers predicting its efficacy is discussed.
    MeSH term(s) Antimetabolites, Antineoplastic ; Azacitidine ; Biomarkers ; DNA ; DNA Methylation ; Humans ; Leukemia, Myeloid, Acute ; Myelodysplastic Syndromes ; Treatment Outcome
    Chemical Substances Antimetabolites, Antineoplastic ; Biomarkers ; DNA (9007-49-2) ; Azacitidine (M801H13NRU)
    Language Japanese
    Publishing date 2018-06-06
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 390900-1
    ISSN 0485-1439
    ISSN 0485-1439
    DOI 10.11406/rinketsu.59.594
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: A predictive model to estimate fever after receipt of the second dose of Pfizer-BioNTech coronavirus disease 2019 vaccine: An observational cohort study.

    Chiba, Satoru / Shinohara, Kaoru

    Health science reports

    2022  Volume 5, Issue 4, Page(s) e742

    Abstract: Background and aims: Fever after coronavirus disease 2019 (COVID-19) vaccination is generally a mild and benign event, but can cause excessive anxiety in younger adults. This study aimed to find key factors that include allergic diseases or physique ... ...

    Abstract Background and aims: Fever after coronavirus disease 2019 (COVID-19) vaccination is generally a mild and benign event, but can cause excessive anxiety in younger adults. This study aimed to find key factors that include allergic diseases or physique that determine fever after vaccination.
    Methods: We conducted an observational cohort study in our hospital to assess post-COVID-19 vaccination fever from April to June 2021. A total of 153 medical personnel aged 22-86 years of age were involved in the study to receive two doses, intramuscularly 21 days apart, of the Pfizer-BioNTech COVID-19 vaccine (30 μg per dose). Vaccination records were taken more than 72 h after vaccination. Clinical and laboratory variables (age, sex, allergy history, weight, height, serum hemoglobin concentration, and these derivatives) were examined by multivariable logistic regression analysis using the peak axillary temperature in the 4-day period after the second vaccination as a dependent variable.
    Results: No serious safety problems were detected. The incidence of a postsecond vaccination fever of 37.3°C or above was 29.4%. Logistic regression analysis found age, history of perennial allergic rhinitis, body surface area, body weight, percent overweight, and serum hemoglobin concentration as independent predictors of postvaccination fever. The characteristics of this individual were incorporated into the numerical model of human thermoregulation. The evaluation of this model had a sensitivity of 66.1% and a specificity of 90.7% in the detection of postvaccination fever. The multiple coefficient of determination (
    Conclusion: The COVID-19 vaccine induced higher rates of fever during the 4-day period after the second vaccination. Younger age, part of the allergy history, small and light body, and concentrated blood were associated with postvaccination fever.
    Language English
    Publishing date 2022-07-20
    Publishing country United States
    Document type Journal Article
    ISSN 2398-8835
    ISSN (online) 2398-8835
    DOI 10.1002/hsr2.742
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: A Case Report of Respiratory Syncytial Virus-Infected 8p Inverted Duplication Deletion Syndrome with Low Natural Killer Cell Activity.

    Tokutake, Haruka / Chiba, Satoko

    The Tohoku journal of experimental medicine

    2022  Volume 257, Issue 4, Page(s) 347–352

    Abstract: The 8p inverted duplication deletion [inv dup del(8p)] is a complex structural rearrangement in chromosome 8. Patients with this chromosomal abnormality exhibit developmental delay, facial dysmorphism, central nervous abnormalities, hypotonia, orthopedic ...

    Abstract The 8p inverted duplication deletion [inv dup del(8p)] is a complex structural rearrangement in chromosome 8. Patients with this chromosomal abnormality exhibit developmental delay, facial dysmorphism, central nervous abnormalities, hypotonia, orthopedic abnormalities, and congenital heart defects. However, cellular immune function in inv dup del(8p) syndrome has never been reported. We present the case of a 1-month-old boy with inv dup del(8p) syndrome who had severe respiratory syncytial (RS) virus bronchiolitis. Natural killer (NK) cells are recruited to airway epithelium in the early phase of RS viral infection. A cluster of defensin genes (DEFs), which are deleted in inv dup del(8p), are located in 8p23.1. Human defensins are involved in antiviral activity through the NK cell-mediated cytotoxic pathway and envelope disruption in the normal immune response. This patient showed lower NK cell activity and α-defensin level compared with healthy controls. These results suggest that decreased NK cell activity can result from DEF haploinsufficiency. In addition to a skeletal deformity with chromosomal abnormality, NK cell-mediated immune deficiency may account for the exacerbation of RS virus bronchiolitis.
    MeSH term(s) Bronchiolitis ; Chromosome Deletion ; Chromosome Disorders/complications ; Chromosome Disorders/genetics ; Chromosome Inversion ; Humans ; Infant ; Killer Cells, Natural ; Male ; Respiratory Syncytial Viruses
    Language English
    Publishing date 2022-06-30
    Publishing country Japan
    Document type Case Reports ; Journal Article
    ZDB-ID 123477-8
    ISSN 1349-3329 ; 0040-8727
    ISSN (online) 1349-3329
    ISSN 0040-8727
    DOI 10.1620/tjem.2022.J052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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