Publications by authors named "Hironobu Saito"

So far, it has been difficult to directly compare diverse characteristic gelation mechanisms over different length and time scales. This paper presents a universal water structure analysis of several gels with different structures and gelation mechanisms including polymer gels, supramolecular gels composed of surfactant micelles, and cement gels. The spatial distribution of water molecules was analyzed at molecular level from a diagram of the relaxation times and their distribution parameters (- diagrams) with our database of the 10 GHz process for a variety of aqueous systems.

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The present study aimed to investigate the incidence of hepatocellular carcinoma (HCC) and factors related to HCC occurrence after direct-acting antiviral (DAA) treatment in the Fukushima Liver Academic Group (FLAG). We conducted a multicenter retrospective cohort study of 1068 patients without cirrhosis (NC) or with compensated liver cirrhosis (LC) who achieved a sustained virologic response (SVR). First, we compared the cumulative HCC incidence and survival rates in NC (n = 880) and LC (n = 188) patients without a history of HCC treatment.

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This paper presents dielectric measurements of talc, glass beads, and their mixtures under different moisture and salinity levels. The measurements were conducted using a prototype seven-rod probe (15 mm long central rod) connected to a single port of vector network analyzer. The samples were moistened with distilled water and KCl solutions in order to obtain six different moisture content levels.

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Article Synopsis
  • The study examines the dynamics of hydrogen bonding networks (HBN) in hydrogen bonding liquids, specifically focusing on water and biological mixtures, through dielectric spectroscopy measurements.
  • It identifies a GHz frequency relaxation process around 20 GHz with a specific relaxation time, indicating the rate of hydrogen bond exchanges increases with higher hydrogen bond density.
  • The research emphasizes the importance of fractal analysis in understanding the dynamic behaviors of HBN, especially in complex systems like polymer-water mixtures, suggesting it’s an effective tool for studying molecular mechanisms in various aqueous environments.
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Dynamics of solvent molecules restricted in poly (acryl amide) gels immersed in solvent mixtures of acetone⁻, 1,4-dioxane⁻, and dimethyl sulfoxide⁻water were analyzed by the time domain reflectometry method of dielectric spectroscopy and the pulse field gradient method of nuclear magnetic resonance. Restrictions of dynamic behaviors of solvent molecules were evaluated from relaxation parameters such as the relaxation time, its distribution parameter, and the relaxation strength obtained by dielectric measurements, and similar behaviors with polymer concentration dependences for the solutions were obtained except for the high polymer concentration in collapsed gels. Scaling analyses for the relaxation time and diffusion coefficient respectively normalized by those for bulk solvent suggested that the scaling exponent determined from the scaling variable defined as a ratio of the size of solvent molecule to mesh size of polymer networks were three and unity, respectively, except for collapsed gels.

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Objective Due to the Great East Japan Earthquake, which occurred in March 2011, many residents of Fukushima Prefecture were affected by a radiation accident in addition to suffering loss or damage from the earthquake and the subsequent tsunami. The aim of this study was to evaluate the actual condition of patients with peptic ulcers related to the disaster. Methods Patients with peptic ulcers at six hospitals in three different regions of Fukushima Prefecture during the two months following the disaster and the corresponding period of the year before and the year after the disaster were enrolled in this study.

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The founding industry members (European Federation of Pharmaceutical Industries and Associations [EFPIA], Japanese Pharmaceutical Manufacturers Association [JPMA], and Pharmaceutical Research and Manufacturers of America [PhRMA]) of the International Council for Harmonisation (ICH) have a 25-year track record of the contribution to ICH. Given that further globalization of ICH is expected, we should value this legacy and maintain the current ICH culture and its principles of "benefit to the patients first" and "science-based approach," through which industry members would ensure transparency and objectivity in their ICH activities. In order to maintain and develop the culture of the ICH and its current momentum, a 2-way approach is important: (1) sharing common views through dialogues among leaders of each industry association, such as through the Industry Executive Council, and (2) spreading the values through grassroots activities involving wider stakeholders in global forums such as DIA, as platforms for sharing the knowledge, views, and culture of ICH across the globe.

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Despite the bright and tuneable photoluminescence (PL) of semiconductor quantum dots (QDs), the PL instability induced by Auger recombination and oxidation poses a major challenge in single-molecule applications of QDs. The incomplete information about Auger recombination and oxidation is an obstacle in the resolution of this challenge. Here, we report for the first time that Auger-ionized QDs beat self-sensitized oxidation and the non-digitized PL intensity loss.

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Nanoprobes based on quantum clusters (QC) with near-infrared fluorescence, magnetic-resonance-imaging contrast, and singlet-oxygen-sensitized intracellular fluorescence are studied. The generation of singlet oxygen and singlet-oxygen-sensitized fluorescence uncaging by magnetic and NIR-emitting nanoparticles are exploited for multimodal bioimaging in vitro.

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Objective: We aimed to define the clinical features of liver dysfunction in patients with systemic lupus erythematosus (SLE).

Methods: The frequency and causes of liver dysfunction were examined in 206 patients with SLE.

Results: Liver dysfunction was evident in 123 (59.

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We report a case of idiopathic portal hypertension (IPH) complicated with autoimmune hepatitis. A 60-year-old woman was admitted to our hospital with esophageal and gastric varices in February 2010. Abdominal ultrasonography and computed tomography showed splenomegaly and collateral veins without evidence of liver cirrhosis.

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Aim: To assess the prevalence of autoantibodies against nucleosomes (anti-nucleosome Ab) in patients with autoimmune hepatitis (AIH), examine the correlation between anti-nucleosome Ab and disease activity, and evaluate the effectiveness of anti-nucleosome Ab in predicting relapse.

Methods: We analyzed serum anti-nucleosome Ab levels in 38 patients with AIH by enzyme-linked immunosorbent assay, and assessed their correlation with clinical characteristics.

Results: Anti-nucleosome Ab levels were significantly higher in AIH, but not in patients with chronic hepatitis B (n = 20) or chronic hepatitis C (n = 20), compared to healthy controls (n = 15).

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Objectives: We attempted to measure multiple autoantibodies simultaneously using line immunoassay (LIA) in patients with primary biliary cirrhosis (PBC) with or without anti-mitochondrial antibody (AMA) and patients with PBC-autoimmune hepatitis (AIH) overlap, and we examined the clinical significance of measuring these autoantibodies.

Methods: The study population consisted of 80 patients with PBC (including 12 AMA-negative patients), 16 patients with PBC-AIH overlap and 40 patients with AIH as controls. Nine antibodies (AMA-M2, M2-3E, Sp100, PML, gp210, Ro-52, LKM-1, LC-1 and SLA/LP) were detected by LIA, and AMA-M2 and anti-centromere antibody (ACA) were detected by ELISA.

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Aim: To compare clinicopathological features of acute presentation of type 1 autoimmune hepatitis (AIH) with or without centrilobular necrosis (CN).

Methods: Our study comprised 41 patients with biopsy-proven acute presentation (acute exacerbation phase 36, acute hepatitis phase 5) of type 1 AIH at our hospital from 1975 to 2009. Elevated serum alanine aminotransferase (ALT) (> 5x upper limit of normal) identified acute presentation of the disease.

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We report the case of a 41-year-old woman with hepatocellular carcinoma (HCC). She received living donor liver transplantation (LDLT) from her husband for HCC at 36 years of age. She had few risk factors for HCC recurrence, such as elevated alpha-fetoprotein (AFP), protein induced by vitamin K absence (PIVKA) II, vascular invasion, and number, size of tumors.

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A 68-year-old woman was evaluated by her primary physician for swelling and pain in the right neck. Treatment with antibiotics failed to achieve any improvement. Two weeks later, she was hospitalized to the gastroenterology department because of liver dysfunction and pneumonia.

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Aim:   Patients receiving corticosteroid therapy on a tapered schedule occasionally suffer autoimmune hepatitis (AIH) relapses. The aim of this study was to assess the frequency and features of relapses, explore risk factors associated with relapses, and evaluate the effectiveness of azathioprine (AZP) therapy against relapses in Japanese patients with type 1 AIH.

Methods:   We assessed clinical characteristics and therapeutic processes in 67 patients diagnosed with AIH.

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A 34-year-old woman showed liver dysfunction for the first time at 3 months after delivery. Two years later, she was referred to our department with continued liver dysfunction. She fulfilled the criteria for primary biliary cirrhosis (PBC)-autoimmune hepatitis (AIH) overlap.

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Background: Coexistence of primary biliary cirrhosis (PBC) and autoimmune hepatitis (AIH) is referred to as PBC-AIH overlap. Pathogenesis of PBC-AIH is not well understood and its diagnosis is challenging. We previously reported the clinical characteristics of 10 patients diagnosed with PBC-AIH overlap.

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An 81-year-old man, who experienced upper abdominal pain after shoveling snow, was admitted to a local hospital where a computed tomography (CT) showed a cystic lesion adjoining the pancreas. He was transferred to our department for detailed investigations and treatment. On ultrasonography, a tumor of the caudate lobe of the liver, with which the cystic lesion was continuous, was seen.

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A 19-year-old Japanese woman had melena 2 months after systemic lupus erythematosus was diagnosed. Colonoscopy showed diffuse ulceration with bleeding in the ileum, suggesting that the melena was due to ischemic enteritis associated with lupus enteritis. Because treatment with high doses of steroid, anticoagulants, and cyclophosphamide pulse was ineffective, surgical intervention was planned.

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A 43-year-old woman with multiple sclerosis (MS) was treated with pulsed methylprednisolone and interferon beta at a hospital. Four weeks after initiating treatment, liver dysfunction occurred and she was referred and admitted to our hospital. Clinical and laboratory findings were consistent with and fulfilled the criteria for drug-induced hepatitis, but not for autoimmune hepatitis (AIH).

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Reportedly, bacterial DNA containing unmethylated cytosine-guanosine dinucleotide motif-containing oligodeoxynucleotides (CpG-ODNs) can induce Th1-type adjuvant effects. We produced autoantibodies and induced hepatitis in mice using extracted proteins from human hepatocytes with CpG-ODNs as adjuvant. Western blot analysis was performed of sera from immunized mice and two patients with autoimmune hepatitis (AIH).

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A 36-year-old woman was admitted to our department for close examination of a liver tumor that was found during a medical checkup. Abdominal US, CT and MRI showed a tumor in segment 7 (S7) of the liver. Although imaging suggested hepatocellular carcinoma, laboratory tests showed no abnormality in liver function, hepatitis virus markers were negative, and tumor markers including protein induced by vitamin K absence or antagonist II (PIVKA-II), alpha-fetoprotein (AFP), carbohydrate antigen 19-9 (CA19-9), and carcinoembryonic antigen (CEA) were all within normal ranges.

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A 69-year-old man with autoimmune hepatitis (AIH) was admitted to hospital with high fever and cough. Chest roentgenogram and computed tomography showed pleural and pericardial effusion. Serological tests showed a high titer of antinuclear antibodies and positive anti-DNA antibody and lymphocytopenia.

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