225 results on '"A. Fukumi"'
Search Results
2. Relapse of minimal change disease following the third mRNA COVID-19 vaccination: a case report and literature review.
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Teragaki, Mariko, Tanaka, Mari, Yamamoto, Hiroko, Watanabe, Tomoka, Takeoka, Jun, Fukumi, Awaisshafig, Maeda, Kotaro, Takami, Yohtaro, Saita, Hirona, Iwanari, Sachio, Ikeda, Masaki, and Takeoka, Hiroya
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- 2024
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3. Ultraporous, Ultrasmall MgMn2O4 Spinel Cathode for a Room-Temperature Magnesium Rechargeable Battery.
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Kobayashi, Hiroaki, Fukumi, Yu, Watanabe, Hiroto, Iimura, Reona, Nishimura, Naomi, Mandai, Toshihiko, Tominaga, Yoichi, Nakayama, Masanobu, Ichitsubo, Tetsu, Honma, Itaru, and Imai, Hiroaki
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- 2023
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4. Effectiveness of Favipiravir on Nonsevere, Early-Stage COVID-19 in Japan: A Large Observational Study Using the COVID-19 Registry Japan.
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Tsuzuki, Shinya, Hayakawa, Kayoko, Doi, Yohei, Shinozaki, Tomohiro, Uemura, Yukari, Matsunaga, Nobuaki, Terada, Mari, Suzuki, Setsuko, Asai, Yusuke, Yamada, Gen, Saito, Sho, Shibata, Taro, Kondo, Masashi, Izumi, Kazuo, Hojo, Masayuki, Mizoue, Tetsuya, Yokota, Kazuhisa, Nakamura-Uchiyama, Fukumi, Saito, Fumitake, and Sugiura, Wataru
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- 2022
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5. Change Over Time in Seasonality and Severity of Children Hospitalized With Respiratory Syncytial Virus Infection in Japan
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Ozeki, Shoko, Oshiro, Makoto, Fukumi, Daichi, Takeuchi, Tomoya, Mii, Sayaka, and Nishikado, Yuichi
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- 2022
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6. Nosocomial outbreak of coronavirus disease in two general wards during the initial wave of the pandemic in 2020, Tokyo, Japan.
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Naoya Sakamoto, Masayuki Ota, Tomoko Takeda, Atsushi Kosaka, Takuya Washino, Sentaro Iwabuchi, Minako Beppu, Itaru Nishiduka, Tamano Matsui, Motoi Suzuki, and Fukumi Nakamura-Uchiyama
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SARS-CoV-2 ,COVID-19 ,CORONAVIRUS diseases ,COVID-19 pandemic ,MEDICAL assistants ,NURSES' aides ,DISEASE outbreaks - Abstract
Objective: Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARSCoV-2), was first reported in China and subsequently spread worldwide. In Japan, many clusters occurred during the first wave in 2020. We describe the investigation of an early outbreak in a Tokyo hospital. Methods: A COVID-19 outbreak occurred in two wards of the hospital from April to early May 2020. Confirmed cases were individuals with laboratory-confirmed SARS-CoV-2 infection linked to Wards A and B, and contacts were patients or workers in Wards A or B 2 weeks before the index cases developed symptoms. All contacts were tested, and cases were interviewed to determine the likely route of infection and inform the development of countermeasures to curb transmission. Results: There were 518 contacts, comprising 472 health-care workers (HCWs) and 46 patients, of whom 517 were tested. SARS-CoV-2 infection was confirmed in 42 individuals (30 HCWs and 12 patients). The proportions of SARS-CoV-2 infections in HCWs were highest among surgeons, nurses, nursing assistants and medical assistants. Several HCWs in these groups reported being in close proximity to one another while not wearing medical masks. Among HCWs, infection was thought to be associated with the use of a small break room and conference room. Discussion: Nosocomial SARS-CoV-2 infections occurred in two wards of a Tokyo hospital, affecting HCWs and patients. Not wearing masks was considered a key risk factor for infection during this outbreak; masks are now a mandated countermeasure to prevent the spread of SARS-CoV-2 infection in hospital settings. [ABSTRACT FROM AUTHOR]
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- 2022
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7. Effectiveness of Favipiravir on Nonsevere, Early-Stage COVID-19 in Japan: A Large Observational Study Using the COVID-19 Registry Japan
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Tsuzuki, Shinya, Hayakawa, Kayoko, Doi, Yohei, Shinozaki, Tomohiro, Uemura, Yukari, Matsunaga, Nobuaki, Terada, Mari, Suzuki, Setsuko, Asai, Yusuke, Yamada, Gen, Saito, Sho, Shibata, Taro, Kondo, Masashi, Izumi, Kazuo, Hojo, Masayuki, Mizoue, Tetsuya, Yokota, Kazuhisa, Nakamura-Uchiyama, Fukumi, Saito, Fumitake, Sugiura, Wataru, and Ohmagari, Norio
- Abstract
Introduction: Several randomized controlled trials have compared the effectiveness of favipiravir with that of placebo. However, evidence regarding its effect on nonsevere, early-stage coronavirus disease 2019 (COVID-19) remains insufficient. Methods: We used the COVID-19 Registry Japan, a nationwide registry of inpatients with COVID-19, for evaluating the effectiveness of favipiravir on patients with nonsevere, early-stage COVID-19. Eligible patients, who did not need supplementary oxygen therapy at admission, were classified according to two regimens (starting favipiravir therapy within 4 days from admission vs. no favipiravir during hospitalization) and were then compared using a three-step method (cloning, censoring, and weighting). The primary outcome was supplementary oxygen requirement during hospitalization, and the secondary outcomes were the need for invasive mechanical ventilation or extracorporeal membrane oxygenation (IMV/ECMO) and overall mortality at 30 days. Results: A total of 7654 cases were analyzed. The “start favipiravir” regimen did not show substantial differences in the primary outcome [hazard ratio 0.825, 95% confidence interval (CI) 0.657–1.04, p= 0.098] and both of the secondary outcomes [need for IMV/ECMO and overall 30-day mortality, hazard ratio 1.02 (95% CI 0.649–1.60) and 0.869 (95% CI 0.519–1.46), p= 0.929 and 0.594, respectively]. Conclusions: In this large cohort from a COVID-19 registry, favipiravir was not associated with a positive effect on the clinical outcome on patients with nonsevere, early-stage COVID-19, suggesting that it is not an essential drug for COVID-19 treatment.
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- 2022
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8. Vascular sound visualization system is useful for monitoring and surveillance of vascular access
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Tsuboi, Masato, Suzuki, Hiroaki, Kawai, Hirokazu, Ejima, Toru, and Mitsuishi, Fukumi
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Backgrounds: Vascular access (VA) is a lifeline for maintenance hemodialysis patients. Monitoring and surveillance of VA, therefore, play an important role for maintaining VA patency. Surveillance needs special apparatus to estimate the VA function, while, monitoring including physical examination does not usually need such devices but highly skill-dependent and qualitative.Purpose: We report the clinical utility in monitoring and surveillance of VA using a newly developed electronic stethoscope and vascular sound visualization application.Methods: One hundred eight patients participated in the study. The vascular sounds were collected using the electronic stethoscope, converted into digital data, sent wirelessly to a personal computer, and then calculated. The units for the calculated intensity of the vascular sound were decibel [dB]. The intensity, however, was normalized as INDEX values ranging from 0 to 99 for practical use. Correlation between INDEX and the mean flow volume (mFV) and resistance index (RI) of brachial artery measured by Doppler ultrasound sonography were examined for VA surveillance. INDEX was continually measured at each dialysis session in ten patients who underwent the angioplasty for VA monitoring.Results: INDEX significantly correlated with the mFV (coefficient of correlation value = 0.68, p< 0.001) and RI (coefficient of correlation value = −0.51, p< 0.001) of brachial artery. Using the calculated cut-off values, the accuracy of INDEX for the diagnosis of AVF dysfunction ranged from 66% to 82%. INDEX attained the peak just after the angioplasty of culprit lesions and gradually decreased from one patient to another.Conclusion: These results suggest that vascular sound visualization system can be useful in VA monitoring and surveillance for detecting and predicting the access stenosis.
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- 2022
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9. An immersive self-training system of receive motion for volleyball beginners
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Nakajima, Masayuki, Muramatsu, Shogo, Kim, Jae-Gon, Guo, Jing-Ming, Kemao, Qian, Fukumi, Naoto, and Makino, Mitsunori
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- 2022
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10. Separation of compound actions with wrist and finger based on EMG
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Komuro, Takashi, Shimizu, Tsuyoshi, Yamamoto, Eisuke, Ito, Momoyo, Ito, Shin-ichi, and Fukumi, Minoru
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- 2021
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11. A virtual keyboard with multimodal feedback using physical tabletop
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Nakajima, Masayuki, Kim, Jae-Gon, Lie, Wen-Nung, Kemao, Qian, Fukumi, Naoto, and Makino, Mitsunori
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- 2021
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12. Designing a graphical user interface for the decision support system of driving fatigue
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Ani, Mohammad Firdaus, Kamat, Seri Rahayu, Fukumi, Minoru, Minhat, Mohamad, Abdullah, Abu, and Husin, Kalthom
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The paper presents the continuity study from the previous work, which designing the graphical user interface (GUI) for a decision support system (DSS) of driving fatigue. As driving fatigue has been recognised as one of the significant contributory factors to road accidents and fatalities in Malaysia, the author developed the DSS that providing analysis, and proving solutions and recommendations to the road users. In other words, the DSS acts as the advisory and decision-maker tool. In designing the GUI for a DSS, the Django based on Python programming language was used by the authors. There are five main GUI that has been designed in this study: admin GUI user profile and driving information GUI, regression model GUI, risk factor analysis GUI and superuser GUI. Further testing and validation of the graphical user interface for the DSS are suggested before it is used commercially.
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- 2021
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13. Creation and Validation of Classification Criteria for Discoid Lupus Erythematosus
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Elman, Scott A., Joyce, Cara, Braudis, Kara, Chong, Benjamin F., Fernandez, Anthony P., Furukawa, Fukumi, Hasegawa, Minoru, Kim, Hee Joo, Li, Sara J., Lian, Christine G., Szepietowski, Jacek C., Werth, Victoria P., and Merola, Joseph F.
- Abstract
IMPORTANCE: Classification criteria are the standardized definitions that are used to enroll uniform cohorts for research studies. They emphasize high specificity and are distinct from diagnostic criteria. No universally recognized classification criteria currently exist for discoid lupus erythematosus (DLE), which has led to problematic heterogeneity in observational and interventional clinical studies across the field. OBJECTIVE: To create and validate classification criteria for DLE using 12 previously defined candidate criteria items. DESIGN, SETTING, AND PARTICIPANTS: For this diagnostic study, candidate criteria items were prospectively applied by dermatologists and dermatopathologists at clinical visits of patients with DLE or a condition that could be confused for DLE, termed a DLE mimicker, at academic dermatology practices across the United States, Poland, Japan, and South Korea. Data were collected from December 1, 2017, to February 1, 2019, and analyzed from March 1 to September 19, 2019. MAIN OUTCOMES AND MEASURES: Clinical features among these 2 groups were calculated and compared with χ2 or Fisher exact tests. Candidate models were identified using best subsets logistic regression analysis. Improvement tests, fit statistics, and discrimination were considered to choose a final model. RESULTS: Nine sites contributed 215 patients, 15 of whom had missing or incomplete data. The final model for DLE classification criteria includes only clinical variables: atrophic scarring (3 points), location in the conchal bowl (2 points), preference for the head and neck (2 points), dyspigmentation (1 point), follicular hyperkeratosis and/or plugging (1 point), and erythematous to violaceous in color (1 point), with an area under the receiving operating characteristic curve of 0.91 (95% CI, 0.87-0.95). A score of at least 5 points yields a sensitivity of 84.1% and a specificity of 75.9% in the classification of DLE, with increasing scores yielding higher specificity. CONCLUSIONS AND RELEVANCE: These findings provide the initial validation of classification criteria for DLE for use in observational and clinical trials.
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- 2020
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14. Anaphylaxis to ginger induced by herbal medicine
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Okuhira, Hisako, Nakatani, Yumi, Furukawa, Fukumi, and Kanazawa, Nobuo
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- 2024
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15. Retrospective observational study of the use of artemether-lumefantrine in the treatment of malaria in Japan.
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Nakamura-Uchiyama, Fukumi, Katanami, Yuichi, Kikuchi, Tadashi, Takaya, Saho, Kutsuna, Satoshi, Kobayashi, Taiichiro, Mizuno, Yasutaka, Hasegawa, Tetsuo, Koga, Michiko, Yoshimura, Yukihiro, Hasegawa, Chihiro, Kato, Yasuyuki, Kimura, Mikio, and Maruyama, Haruhiko
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Background The Research Group on Chemotherapy of Tropical Diseases, Japan, introduced artemether–lumefantrine (AL) in late 2002, mainly for treating uncomplicated Plasmodium falciparum malaria. Because AL was on the market in Japan in March 2017, the effectiveness and safety of AL were analyzed to help medical personnel use AL optimally. Methods Case report forms submitted by the attending physicians were analyzed. When necessary, direct contact with the attending physicians was made to obtain detailed information. Results Effectiveness analysis was performed for 62 cases and safety analysis was performed for 66 cases. In P. falciparum malaria, the overall cure rate was 91.1% (51/56), of which the cure rates for Japanese and non-Japanese patients were 82.1% (23/28) and 100% (28/28), respectively. The successfully treated cases included severe P. falciparum malaria, with parasite densities exceeding 500,000/μL. Adverse events were reported in 14 patients, including delayed hemolytic anemia which occurred in the top four highest parasitemic cases. Conclusions AL treatment failure in P. falciparum malaria may not be rare among non-immune individuals, including Japanese. The possibility of delayed hemolytic anemia, which occurs preferentially in high parasitemic cases, should be considered following AL treatment. [ABSTRACT FROM AUTHOR]
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- 2018
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16. Fluorous Property of a Short Perfluoroalkyl-Containing Compound Realized by Self-Assembled Monolayer Technique on a Silicon Substrate
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Kise, Ryuma, Fukumi, Aki, Shioya, Nobutaka, Shimoaka, Takafumi, Sonoyama, Masashi, Amii, Hideki, Takagi, Toshiyuki, Kanamori, Toshiyuki, Eda, Kazuo, and Hasegawa, Takeshi
- Abstract
Fluorous properties represented by water-and-oil repellency are perfluoroalkyl (Rf) compound-specific characteristics, which are widely used for surface coating of glass, electronic devices and textiles for preventing water and grease fouling. According to the stratified dipole-arrays (SDA) theory, the minimum Rflength of (CF2)7is theoretically necessary for realizing fluorous properties. Unfortunately, however, production of compounds involving this chemical unit is strictly banned because of concerns of environmental pollution, which is a big dilemma. Here, we show that the fluorous properties can be realized by self-assembled monolayer (SAM) even with a short Rf-containing compound, since the SAM technique makes the best use of the self-aggregation property of the Rfgroups, and it readily makes the molecules immobile.Fluorous properties are realized by the self-assembled monolayer (SAM) technique even with a short Rf-containing compound by considering that the SAM technique makes the best use of the self-aggregation property of the Rfgroups, and it readily makes the molecules immobile.
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- 2019
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17. Ancylostoma ceylanicum, novel etiological agent for traveler’s diarrhea—report of four Japanese patients who returned from Southeast Asia and Papua New Guinea
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Yoshikawa, Masahide, Ouji, Yukiteru, Hirai, Nobuyasu, Nakamura-Uchiyama, Fukumi, Yamada, Minoru, Arizono, Naoki, Akamatsu, Naoaki, Yoh, Takaharu, Kaya, Daisuke, Nakatani, Toshiya, Kikuchi, Eiryo, Katanami, Yuichi, Satoh, Kimitoshi, Maki, Ryosuke, Miyazato, Yusuke, Oba, Yuichiro, Kasahara, Kei, and Mikasa, Keiichi
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Countries in the Southeast Asia region have a high prevalence of soil-transmitted helminth, such as roundworm, whipworm, and hookworms [Ancylostoma duodenale, Necator americanus, Ancylostoma ceylanicum]. Recent molecular-based surveys have revealed that A. ceylanicum, a zoonotic hookworm, is likely the second most prevalent hookworm species infecting humans in that part of the world, while others have noted that this infection is an emerging public health risk not only for indigenous people but also for visitors from other countries. We recently encountered four cases of A. ceylanicuminfection in Japanese individuals who returned from Southeast Asia and Papua New Guinea. Case 1 was a 25-year-old male who stayed in a rainforest in Malaysia for 4 weeks, where he developed abdominal pain and diarrhea in the third week. Eleven adult worms (five males, six females) were expelled after treatment with pyrantel pamoate and identified as A. ceylanicumbased on morphological characteristics and DNA sequences of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene. Case 2 was a 26-year-old male who spent 2 years as an overseas cooperation volunteer for agriculture in Papua New Guinea. He did not note any symptoms at that time, though eggs were detected in feces samples at a medical check-up examination after returning. Although collection of adult worms was unsuccessful, DNA analysis of the eggs for cox1 and the ribosomal internal transcribed spacer (ITS)-1 and ITS-2 genes demonstrated that they were A. ceylanicum.Case 3 was a 47-year-old male who spent 1 month in a rural village in Lao People’s Democratic Republic and began suffering from watery diarrhea from the third week. A total of nine adult worms (three males, six females) were collected by endoscopic procedures and following treatment with pyrantel pamoate. Morphological examination and molecular analyses of the cox1 gene showed that they were A. ceylanicum.Case 4 was a 27-year-old male who participated in group travel to India for 5 days. Three weeks after returning, he developed abdominal pain and diarrhea. Hookworm eggs were found in feces samples and developed into larvae in culture, which were identified as A. ceylanicumbased on molecular analysis of the cox1 gene.Eosinophilia was observed in all of the cases prior to treatment. A. ceylanicumshould be recognized as an important etiologic pathogen of hookworm diseases in travelers to countries in the Southeast Asia and West Pacific Ocean regions.
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- 2018
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18. Pretransplant nivolumab further enhanced Treg expansion after posttransplant cyclophosphamide; another aspect for immune tolerance by PTCy after nivolumab
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Ikegawa, Shuntaro, Meguri, Yusuke, Mizuhara, Kentaro, Fukumi, Takuya, Kobayashi, Hiroki, Sumii, Yuichi, Kondo, Takumi, Sando, Yasuhisa, Iwamoto, Miki, Asada, Noboru, Ennishi, Daisuke, Nishimori, Hisakazu, Fujii, Keiko, Fujii, Nobuharu, Fujisawa, Yuka, Imai, Toshi, Maeda, Yoshinobu, and Matsuoka, Ken-ichi
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- 2021
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19. Development of classification criteria for discoid lupus erythematosus: Results of a Delphi exercise.
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Elman, Scott A., Joyce, Cara, Nyberg, Filippa, Furukawa, Fukumi, Goodfield, Mark, Hasegawa, Minoru, Marinovic, Branka, Szepietowski, Jacek C., Dutz, Jan, Werth, Victoria P., and Merola, Joseph F.
- Abstract
Background: No classification criteria currently exist for discoid lupus erythematosus (DLE), which has led to problematic heterogeneity in both observational and interventional research efforts.Objectives: We sought to develop DLE classification criteria based on consensus of international expert opinion of relevant stakeholders in the field.Methods: Using a Delphi consensus process and nominal group techniques, potential items for classification criteria were generated. Experts ranked items in terms of their appropriateness and ability to discriminate DLE from other diagnoses, and items were subsequently eliminated using consensus exercises.Results: A final list of 12 clinical and histopathologic items was generated for potential inclusion into a set of DLE classification criteria through a formal ongoing validation process.Limitations: The participants are predominantly composed of DLE experts in North America and Europe.Conclusion: This work represents a key step toward the development of formal DLE classification criteria. [ABSTRACT FROM AUTHOR]- Published
- 2017
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20. Case Report: Development of Delayed Hemolytic Anemia after Treatment with Oral Artemether–Lumefantrine in Two Patients with Severe Falciparum Malaria.
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Yasuhiro Tsuchido, Fukumi Nakamura-Uchiyama, Kasumi Toyoda, Moritoshi Iwagami, Kentaro Tochitani, Koh Shinohara, Naokuni Hishiya, Taku Ogawa, Kenji Uno, Kei Kasahara, Yukiteru Ouji, Shigeyuki Kano, Keiichi Mikasa, Tsunehiro Shimizu, Masahide Yoshikawa, and Haruhiko Maruyama
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- 2017
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21. Oral administration of Aloe vera gel powder prevents UVB-induced decrease in skin elasticity via suppression of overexpression of MMPs in hairless mice.
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Saito, Marie, Tanaka, Miyuki, Misawa, Eriko, Yao, Ruiquing, Nabeshima, Kazumi, Yamauchi, Kouji, Abe, Fumiaki, Yamamoto, Yuki, and Furukawa, Fukumi
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ALOE vera ,ULTRAVIOLET spectra ,LABORATORY mice - Abstract
This study reports the effects of oralAloe veragel powder (AVGP) containingAloesterols on skin elasticity and the extracellular matrix in ultraviolet B (UVB)-irradiated hairless mice. Ten-week-old hairless mice were fed diets containing 0.3% AVGP for 8 weeks and irradiated UVB for 6 weeks. Mice treated with AVGP showed significant prevention of the UVB-induced decrease in skin elasticity. To investigate the mechanism underlying this suppression of skin elasticity loss, we measured the expression of matrix metalloproteinase (MMP)-2, -9, and -13. AVGP prevented both the UVB-induced increases in MMPs expressions. Moreover, we investigated hyaluronic acid (HA) content of mice dorsal skin and gene expression of HA synthase-2 (Has2). In the results, AVGP oral administration prevented UVB-induced decreasing in skin HA content andHas2expression and attenuates the UVB-induced decrease in serum adiponectin, which promotesHas2expression. These results suggested that AVGP has the ability to prevent the skin photoaging. AVGP has the potent anti-photoaging activity via suppressing UVB-induced overexpression of MMPs and loss of hyaluronic acid. [ABSTRACT FROM AUTHOR]
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- 2016
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22. A Process of Multidisciplinary Team Communication to Individualize Stroke Rehabilitation of an 84-Year-Old Stroke Patient.
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Fukumi Hiragami, Shogo Hiragami, and Yasuo Suzuki
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COMMUNICATION ,HEALTH care teams ,MAGNETIC resonance imaging ,CASE studies ,MEDICAL needs assessment ,NURSES ,OCCUPATIONAL therapists ,PHYSICAL therapists ,PHYSICIANS ,REFLECTION (Philosophy) ,SOCIAL workers ,SPEECH therapists ,PATIENT care conferences ,FUNCTIONAL assessment ,STROKE rehabilitation ,DESCRIPTIVE statistics - Abstract
Previously, we have used a multidisciplinary team (MDT) approach to individualize rehabilitation of very old stroke patients as a means to establish intervention points for addressing impaired activities of daily living (ADL). However, this previous study was limited because of a lack in describing the communication process over time. This case study characterized the MDT communication process in the rehabilitation of an 84-year-old patient over the course of 15 weeks. The MDT consisted of 3 nurses, 1 doctor, 6 therapists, and the patient/families. Meetings (15 minutes each) were held at 4, 6, 8, and 15 weeks following the patient' s admission. To individualize the rehabilitation, the communication process involved gaining knowledge about ADL impairments, sharing assessments, providing treatment options, and reflecting on desired treatment outcomes--a process termed KATR. The knowledge, assessment, treatment, and reflection (KATR) process established intervention points focusing on specific ADL impairments. The team members focused the interventions on the impaired ADL identified in the KATR process, and individualized rehabilitation was generated from the MDT information-sharing knowledge. In the initial meeting (Week 4), intervention points derived from the KATR process focused on rehabilitation of self-care impairments. These impairments improved by Week 15. By the last meeting, the MDT intervention points focused on mobility impairments. Having an organized communication process (i.e., KATR) facilitates individualization of rehabilitation without lengthy and frequent MDT meetings and enhances the quality of rehabilitation after a stroke. [ABSTRACT FROM AUTHOR]
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- 2016
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23. A tool for mass-screening of paragonimiasis: an enzyme-linked immunosorbent assay with urine samples
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Qiu, Xu, Nakamura-Uchiyama, Fukumi, Nawa, Yukifumi, and Itoh, Makoto
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Paragonimiasis is one of the foodborn trematodiases and number of the patients was estimated to be about 23 million around the world. To obtain good compliance of people for the surveillance of paragonimiasis, an enzyme-linked immunosorbent assay (ELISA) for the diagnosis of paragonimiasis with unconcentrated urine samples was developed. Paragonimus westermaniantigen specific IgG and IgG4 were detected in urine samples from paragonimiasis patients and the levels correlated well with those detected in the paired serum samples. Cross-reactions observed among other trematodiasis and a tuberculosis patient with the antigen specific IgG were much reduced by detecting the antigen specific IgG4; 9.2 % to 2.3 %. The ELISA with urine samples, which are collected safely and easily, will be a useful tool for a mass-screening of paragonimiasis.
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- 2016
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24. The utility of a care model to individualize rehabilitation in adults aged over 80 years.
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Hiragami, Fukumi, Nonaka, Tetsushi, Saitoh, Keisuke, and Suzuki, Yasuo
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COGNITION disorders ,HEALTH facilities ,LIFE skills ,MATHEMATICAL models ,MOVEMENT disorders ,NEEDS assessment ,SCIENTIFIC observation ,RESEARCH funding ,STROKE ,THEORY ,PATIENT-centered care ,STROKE rehabilitation ,STROKE patients ,DESCRIPTIVE statistics ,OLD age ,PSYCHOLOGY - Abstract
Objective: The objectives of the present study were to assess the complexity and multidimensionality of rehabilitation needs of very old stroke patients aged ≥ 80 years and report how rehabilitation interventions are customized to meet the complex needs of patients at a hospital with a majority of old patients. Methods: The complex problems faced by 18 post-stroke patients (age, range: 80-92 years) were characterized in terms of the following multiple dimensions: (1) clinical features, (2) functional (motor/cognitive) impairment features, (3) psychological aspects, and (4) environmental aspects. We then evaluated the rehabilitation interventions designed to address the problems identified in these different dimensions in detail. Results: The needs of very old stroke patients were extremely complex and unique. To cope with this complexity, rehabilitation interventions were customized in a flexible manner, considering the different dimensions of the needs of these patients. Although the interventions were customized, the complex problems experienced by patients could be divided into stroke conditions on the basis of some invariant patterns in rehabilitation intervention. Conclusions: We obtained empirical data that illustrated the necessity of considering not only clinical features, but also multiple dimensions of problems faced by very old stroke patients during rehabilitation interventions. [ABSTRACT FROM AUTHOR]
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- 2015
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25. Ultraporous, Ultrasmall MgMn2O4Spinel Cathode for a Room-Temperature Magnesium Rechargeable Battery
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Kobayashi, Hiroaki, Fukumi, Yu, Watanabe, Hiroto, Iimura, Reona, Nishimura, Naomi, Mandai, Toshihiko, Tominaga, Yoichi, Nakayama, Masanobu, Ichitsubo, Tetsu, Honma, Itaru, and Imai, Hiroaki
- Abstract
Magnesium rechargeable batteries (MRBs) promise to be the next post lithium-ion batteries that can help meet the increasing demand for high-energy, cost-effective, high-safety energy storage devices. Early prototype MRBs that use molybdenum-sulfide cathodes have low terminal voltages, requiring the development of oxide-based cathodes capable of overcoming the sulfide’s low Mg2+conductivity. Here, we fabricate an ultraporous (>500 m2g–1) and ultrasmall (<2.5 nm) cubic spinel MgMn2O4(MMO) by a freeze-dry assisted room-temperature alcohol reduction process. While the as-fabricated MMO exhibits a discharge capacity of 160 mAh g–1, the removal of its surface hydroxy groups by heat-treatment activates it without structural change, improving its discharge capacity to 270 mAh g–1─the theoretical capacity at room temperature. These results are made possible by the ultraporous, ultrasmall particles that stabilize the metastable cubic spinel phase, promoting both the Mg2+insertion/deintercalation in the MMO and the reversible transformation between the cubic spinel and cubic rock-salt phases.
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- 2023
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26. Emotional Extraction System by Using the Color Combination.
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Sato, Keiko, Mitsukura, Yasue, and Fukumi, Minoru
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Recently, many researches using the human interface have been done. In particular, the KANSEI information processing is attracted as the multimedia information processing on the human interface. The color coordination system which connects colors with feelings is expected as the system supporting the color design. Therefore, to analyze the relation between colors and feelings is one of problems in the field of the KANSEI engineering. In this research, the method for judging the impression caused by the color automatically is proposed. In this paper, the correlation with the impression caused by the color and the color feature is analyzed as the first stage of this research. Concretely, by using the principal component analysis, the correlation with an amount of the sensibility and the color feature is found. [ABSTRACT FROM AUTHOR]
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- 2005
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27. Drift Ice Detection Using a Self-organizing Neural Network.
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Howlett, Robert J., Jain, Lakhmi C., Fukumi, Minoru, Nagao, Taketsugu, Mitsukura, Yasue, and Khosla, Rajiv
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This paper proposes a segmentation method of SAR (Synthetic Aperture Radar) images based on a SOM (Self-Organizing Map) neural network. SAR images are obtained by observation using microwave sensor. For teacher data generation, they are segmented into the drift ice (thick and thin), and sea regions manually, and then their features are extracted from partitioned data. However they are not necessarily effective for neural network learning because they might include incorrectly segmented data. Therefore, in particular, a multi-step SOM is used as a learning method to improve reliability of teacher data, and carry out classification. This process enable us to fix all mistook data and segment the SAR image data using just data. The validity of this method was demonstrated by means of computer simulations using the actual SAR images. [ABSTRACT FROM AUTHOR]
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- 2005
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28. Automatic Extraction System of a Kidney Region Based on the Q-Learning.
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Kubota, Yoshiki, Mitsukura, Yasue, Fukumi, Minoru, Akamatsu, Norio, and Yasutomo, Motokatsu
- Abstract
In this paper, a kidney region is extracted as a preprocessing of kidney disease detection. The kidney region is detected based on its contour information that is extracted from a CT image using a dynamic gray scale value refinement method based on the Q-learning. An initial point to extract the kidney contour is decided by training gray scale values along horizontal direction with Neural Network (NN). Furthermore the kidney contour is corrected by using the snakes more accurately. It is demonstrated that the proposed method can detect stably the kidney contour from CT images of any patients. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
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29. Prediction of Foul Ball Falling Spot in a Base Ball Game.
- Author
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Takajo, Hideyuki, Fukumi, Minoru, and Akamatsu, Norio
- Abstract
In baseball games, foul balls sometimes fly into the spectators seats. Some person can be seriously wounded for those balls. This research aims at developing a system which computes the orbit of a foul ball on real time using camera, predicts of the spot where foul balls fall and informs spectators about its danger. Detection of balls consists of the following three steps: At first each frame is processed using a smoothing filter for noise reduction. Next, temporal Laplacian is carried out for a series of those filtered images. Finally, whether a part of a ball or not is judged for each pixel by translating the resultant images into polar coordinates. The pitching motion is also considered. We report a method for prediction of foul ball falling spot with fuzzy inference. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
30. Influence of Music Listening on the Cerebral Activity by Analyzing EEG.
- Author
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Ogawa, Takahiro, Ota, Satomi, Ito, Shin-ichi, Mitsukura, Yasue, Fukumi, Minoru, and Akamatsu, Norio
- Abstract
In order to solve a stress problem, researchers have studied music therapy. It takes the therapist and patient a long time to select the music. Because the music used in music therapy is of various type. If the music for it is easily selectable, the music therapy can be carried out more effectively. In this paper, the purpose is extraction of features that may be influenced by the music. We pay attention to EEG (electroencephalogram) as an objective and absolute scale. In this paper, we propose a method that extracts features of the EEG by PCA (principal component analysis) and CDA (canonical discriminant analysis). Then we analyze each feature data by NN (neural network). In order to examine whether the proposal system is effective, we try computer simulations for the EEG classification. According to recognition rate by the NN, it was considered that the CDA extracted and classified the features of the EEG better than the PCA. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
31. Feature Generation by Simple FLD.
- Author
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Fukumi, Minoru, and Mitsukura, Yasue
- Abstract
This paper presents a new algorithm for feature generation, which is approximately derived based on geometrical interpretation of the Fisher linear discriminant analysis. In a field of pattern recognition or signal processing, the principal component analysis (PCA) is often used for data compression and feature extraction. Furthermore, iterative learning algorithms for obtaining eigenvectors have been presented in pattern recognition and image analysis. Their effectiveness has been demonstrated on computational time and pattern recognition accuracy in many applications. However, recently the Fisher linear discriminant (FLD) analysis has been used in such a field, especially face image analysis. The drawback of FLD is a long computational time in compression of large-sized between-class and within-class covariance matrices. Usually FLD has to carry out minimization of a within-class variance. However in this case the inverse matrix of the within-class covariance matrix cannot be obtained, since data dimension is higher than the number of data and then it includes many zero eigenvalues. In order to overcome this difficulty, a new iterative feature generation method, a simple FLD is introduced and its effectiveness is demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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- View/download PDF
32. Wrist Motion Pattern Recognition System by EMG Signals.
- Author
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Khosla, Rajiv, Howlett, Robert J., Jain, Lakhmi C., Matsumura, Yuji, Fukumi, Minoru, and Akamatsu, Norio
- Abstract
In this paper, we aim for construction of high-speed and high-accurate system using Fast Fourier Transform (FFT) for feature extraction, Simple-PCA (SPCA) for feature compression, and a neural network (NN) for recognition. In particular, we present a novel method based on Canonical Discriminant Analysis (CDA) to improve recognition accuracy for EMG. From results of computer simulation, it is shown that our approach is effective for improvement in recognition accuracy. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
33. Development and Precision Molding of Optical Glasses with High Refractive Index for Optical Applications
- Author
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Kitamura, Naoyuki, Fukumi, Kohei, Kintaka, Kenji, Ofuchi, Hironori, Honma, Tetsuo, and Akai, Tomoko
- Abstract
The structure and optical properties of phosphate glasses containing bismuth or niobium oxides for subwavelength structure (SWS) optical elements were studied. The glasses containing a large amount of bismuth and niobium oxides had refractive indexes higher than 1.8 and low deformation temperatures. However, these high refractive index glasses were yellowish due to the electronic transition in trivalent bismuth ions and pentavalent niobium ions. The structure of the glasses was investigated by X-ray, IR, and Raman spectroscopy. NbO
x and BiOx formed clusters as the bismuth and niobium oxide content increased. The results showed that the local structure around bismuth and niobium ions was related to the coloration. Based on these results, we developed high refractive index glasses that were used for precision molding to fabricate periodic SWSs. One-dimensional periodic SWSs were fabricated on the glass surface by a precision molding method using a SiC mold on which the reverse of the SWS pattern was carved and a flat SiC mold. One-dimensional SWSs with a high aspect ratio were fabricated on one surface of the glass plate. The niobium phosphate glass plates with the one-dimensional SWS showed phase retardation higher than 1/8l between TE- and TM-polarized beams at 400 nm, demonstrating that a wavelength plate can be fabricated by our precision molding technique.- Published
- 2016
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- View/download PDF
34. Oral administration of Aloe veragel powder prevents UVB-induced decrease in skin elasticity via suppression of overexpression of MMPs in hairless mice
- Author
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Saito, Marie, Tanaka, Miyuki, Misawa, Eriko, Yao, Ruiquing, Nabeshima, Kazumi, Yamauchi, Kouji, Abe, Fumiaki, Yamamoto, Yuki, and Furukawa, Fukumi
- Abstract
This study reports the effects of oral Aloe veragel powder (AVGP) containing Aloesterols on skin elasticity and the extracellular matrix in ultraviolet B (UVB)-irradiated hairless mice. Ten-week-old hairless mice were fed diets containing 0.3% AVGP for 8 weeks and irradiated UVB for 6 weeks. Mice treated with AVGP showed significant prevention of the UVB-induced decrease in skin elasticity. To investigate the mechanism underlying this suppression of skin elasticity loss, we measured the expression of matrix metalloproteinase (MMP)-2, -9, and -13. AVGP prevented both the UVB-induced increases in MMPs expressions. Moreover, we investigated hyaluronic acid (HA) content of mice dorsal skin and gene expression of HA synthase-2 (Has2). In the results, AVGP oral administration prevented UVB-induced decreasing in skin HA content and Has2expression and attenuates the UVB-induced decrease in serum adiponectin, which promotes Has2expression. These results suggested that AVGP has the ability to prevent the skin photoaging.
- Published
- 2016
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35. Development of a New Method for Synthesis of Tandem Hairpin Pyrrole–Imidazole Polyamide Probes Targeting Human Telomeres.
- Author
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Yusuke Kawamoto, Toshikazu Bando, Fukumi Kamada, Yue Li, Kaori Hashiya, Kazuhiro Maeshima, and Hiroshi Sugiyama
- Published
- 2013
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- View/download PDF
36. Case Report: Rare Case of Disseminated Cysticercosis and Taeniasis in a Japanese Traveler after Returning from India.
- Author
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Ken-ichiro Kobayashi, Fukumi Nakamura-Uchiyama, Takeshi Nishiguchi, Kenichi Isoda, Yasumasa Kokubo, Katsuhiko Ando, Masaki Katurahara, Yasuhito Sako, Tetsuya Yanagida, Akira Ito, Sentaro Iwabuchi, and Kenji Ohnishi
- Published
- 2013
- Full Text
- View/download PDF
37. USO DE REDE SOCIAL ON LINE COMO FONTE DE INFORMAÇÃO PARA CRIAÇÃO DE SIGNIFICADO: uma análise sob a perspectiva dos modelos de Brenda Dervin e Karl Weick.
- Author
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Barbosa Ritzmann, Bárbara Nascimento, de Fátima Nunes Silva, Helena, Fukumi Tsunoda, Denise, and Hinça Schneider, Ariane
- Abstract
Copyright of Informacao & Sociedade: Estudos is the property of Universidade Federal de Campina Grande, Centro de Humanidades and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
38. Design and fabrication of an achromatic infrared wave plate with Sb-Ge-Sn-S system chalcogenide glass.
- Author
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Yamada, Itsunari, Yamashita, Naoto, Einishi, Toshihiko, Saito, Mitsunori, Fukumi, Kouhei, and Nishii, Junji
- Published
- 2013
- Full Text
- View/download PDF
39. Large-Group Infection of Boar-Hunting Dogs with Paragonimus westermani in Miyazaki Prefecture, Japan, with Special Reference to a Case of Sudden Death Due to Bilateral Pneumothorax.
- Author
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Nakano, Natsuko, Kirino, Yumi, Uchida, Kazuyuki, Nakamura-Uchiyama, Fukumi, Nawa, Yukifumi, and Horii, Yoichiro
- Subjects
HUNTING dogs ,DOG diseases ,PARAGONIMUS ,VETERINARY parasitology ,HOST-parasite relationships ,TRANSMISSION of parasitic diseases ,FECES examination ,ENZYME-linked immunosorbent assay ,IMMUNOLOGY ,PNEUMOTHORAX ,DISEASES - Abstract
The article presents a study that attempts to determine whether paragonimosis is a common problem among boar hunting dogs. Wild boars are usually the paratenic hosts for the parasite Paragonimus westermani which puts boar hunting dogs to be at a high risk of infection by these parasite. The study sample consists of 20 mixed-breed hunting dogs from Miyazaki Prefecture, Japan with 12 males and 8 females ranging from six months to eight years of age. Microscopic examination revealed Paragonimus westermani eggs in fecal specimens in 10 of the dogs, while immunologic tests found 17 of the dogs to be seropositive on enzyme-linked immunosorbent serologic assay (ELISA.) Two dogs died during the research process, one of which acquired bilateral pneumothorax due to the parasitic infection.
- Published
- 2009
- Full Text
- View/download PDF
40. Phenol peels as a novel therapeutic approach for actinic keratosis and Bowen disease: Prospective pilot trial with assessment of clinical, histologic, and immunohistochemical correlations.
- Author
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Kaminaka, Chikako, Yamamoto, Yuki, Yonei, Nozomi, Kishioka, Akiko, Kondo, Toshikazu, and Furukawa, Fukumi
- Abstract
Background: Although chemical peels may be used for precancerous lesions, no histologic or immunohistochemical studies have been performed to validate clinical impressions and/or outcome. Objective: Our purpose was to investigate the efficacy and prognostic relevance of phenol peels in Japanese patients with actinic keratosis and Bowen disease using clinical and histologic criteria. Methods: A total of 46 patients were treated with phenol peels, and followed up for at least 1 year after treatment. Biopsy specimens were taken before and after treatment. Cases of complete response were classified by the number of treatment sessions. We evaluated parameters for epidermal thickness, proliferation, dysplasia, and apoptosis, and clinical characteristics to correlate phenol peels with assessments of efficacy, patient-selection criteria, and risk for transformation to cutaneous squamous cell carcinoma. Results: There were 39 (84.8%) patients with a complete response after one to 8 treatment sessions. Statistically, differences in clinical improvement with peels and the number of treatment sessions correlated with histology, personal history of skin cancer, tumor thickness, and cyclin A expression. Limitations: This study was a prospective pilot trial. Blinded, placebo-controlled, randomized studies would be ideal. Conclusion: We conclude that phenol peels are very effective for treating precancerous lesions of actinic keratosis and Bowen disease. In addition, our study clearly demonstrates that tumor thickness and cyclin A could be specific and useful markers as adjunctive diagnostic tools to predict the efficacy of phenol treatment of these lesions. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
41. A randomized double-blind trial of intravenous immunoglobulin for pemphigus.
- Author
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Amagai, Masayuki, Ikeda, Shigaku, Shimizu, Hiroshi, Iizuka, Hajime, Hanada, Katsumi, Aiba, Setsuya, Kaneko, Fumio, Izaki, Seiichi, Tamaki, Kunihiko, Ikezawa, Zenro, Takigawa, Masahiro, Seishima, Mariko, Tanaka, Toshihiro, Miyachi, Yoshiki, Katayama, Ichiro, Horiguchi, Yuji, Miyagawa, Sachiko, Furukawa, Fukumi, Iwatsuki, Keiji, and Hide, Michihiro
- Abstract
Background: Pemphigus is a rare life-threatening intractable autoimmune blistering disease caused by IgG autoantibodies to desmogleins. It has been difficult to conduct a double-blind clinical study for pemphigus partly because, in a placebo group, appropriate treatment often must be provided when the disease flares. Objective: A multicenter, randomized, placebo-controlled, double-blind trial was conducted to investigate the therapeutic effect of a single cycle of high-dose intravenous immunoglobulin (400, 200, or 0 mg/kg/d) administered over 5 consecutive days in patients relatively resistant to systemic steroids. Methods: We evaluated efficacy with time to escape from the protocol as a novel primary end point, and pemphigus activity score, antidesmoglein enzyme-linked immunosorbent assay scores, and safety as secondary end points. Results: We enrolled 61 patients with pemphigus vulgaris or pemphigus foliaceus who did not respond to prednisolone (≥20 mg/d). Time to escape from the protocol was significantly prolonged in the 400-mg group compared with the placebo group (P < .001), and a dose-response relationship among the 3 treatment groups was observed (P < .001). Disease activity and enzyme-linked immunosorbent assay scores were significantly lower in the 400-mg group than in the other groups (P < .05 on day 43, P < .01 on day 85). There was no significant difference in the safety end point among the 3 treatment groups. Limitation: Prednisolone at 20 mg/d or more may not be high enough to define steroid resistance. Conclusion: Intravenous immunoglobulin (400 mg/kg/d for 5 d) in a single cycle is an effective and safe treatment for patients with pemphigus who are relatively resistant to systemic steroids. Time to escape from the protocol is a useful indicator for evaluation in randomized, placebo-controlled, double-blind studies of rare and serious diseases. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF
42. Adventitial Mast Cells Contribute to Pathogenesis in the Progression of Abdominal Aortic Aneurysm.
- Author
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Tsuruda, Toshihiro, Kato, Johji, Hatakeyama, Kinta, Kojima, Kazushi, Yano, Mitsuhiro, Yano, Yoshikazu, Nakamura, Kunihidé, Nakamura-Uchiyama, Fukumi, Matsushima, Yoshibumi, Imamura, Takuroh, Onitsuka, Toshio, Asada, Yujiro, Nawa, Yukifumi, Eto, Tanenao, and Kitamura, Kazuo
- Subjects
MAST cells ,ABDOMINAL aortic aneurysms ,AORTIC aneurysms ,HISTOLOGY ,PATHOLOGICAL physiology - Abstract
The article discusses a study which examines the role of adventitial mass cells in the progression of abdominal aortic aneurysm (AAA). Histological study of AAA tissues of patients was conducted, as well as interventional animal and cell culture experiments. The number of mast cells increased in the outer media or adventitia of human AAA, reflecting a positive correlation between the cell number and the AAA diameter.
- Published
- 2008
- Full Text
- View/download PDF
43. Effects of Bifidobacterial Supplementation to Pregnant Women and Infants in the Prevention of Allergy Development in Infants and on Fecal Microbiota
- Author
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Enomoto, Tadao, Sowa, Masanori, Nishimori, Keiji, Shimazu, Shinichiro, Yoshida, Akira, Yamada, Kazuko, Furukawa, Fukumi, Nakagawa, Takemasa, Yanagisawa, Naotake, Iwabuchi, Noriyuki, Odamaki, Toshitaka, Abe, Fumiaki, Nakayama, Jiro, and Xiao, Jin-zhong
- Abstract
Probiotic administration may be a useful method for preventing allergies in infants; however, there have been controversial results about the efficacy. We investigated the effects of bifidobacterial supplementation on the risk of developing allergic diseases in the Japanese population.
- Published
- 2014
- Full Text
- View/download PDF
44. Eradication Therapy for Urticaria with High Titers of Anti H. pyloriIgG Antibody
- Author
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Yoshimasu, Takashi and Furukawa, Fukumi
- Abstract
It is known that idiopathic chronic urticaria occasionally develops with Helicobacter pylori(H. pylori) infection, but the association between urticaria and H. pyloriremains unknown.
- Published
- 2014
- Full Text
- View/download PDF
45. A case of cryptococcal necrotizing fasciitis and immune reconstitution inflammatory syndrome in a renal transplantation recipient.
- Author
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Kuwahara, Masamitsu, Yurugi, Satoshi, Ando, Junji, Takeuchi, Mika, Miyata, Riyo, Harada, Masayuki, Masuda, Yasumitsu, Kanagawa, Saori, Yoneda, Tatsuo, Fukumori, Tatsuya, Ogawa, Taku, Nakamura-Uchiyama, Fukumi, and Kasahara, Kei
- Abstract
Immunocompromised patients are at high risk of unexpectedly serious infections caused by uncommon bacteria or fungi. We experienced a case of Cryptococcus neoformans -induced necrotizing fasciitis (NF) of the lower extremities. The progress so far has been reported by the urology department [1]. Moreover, after the NF had been treated, the patient developed immune reconstitution inflammatory syndrome (IRIS). We report from surgeon's view point. A 51-year-old male renal transplant patient complained of pain in both lower extremities (LE). After the initial debridement, periodic acid-Schiff after diastase digestion (D-PAS) staining confirmed the diagnosis. No symptoms were seen in the lungs or cerebrospinal system. The patient was reluctant to undergo surgical treatment but several debridement improved patient's condition. After the LE wound healed, prednisolone was discontinued, then painful nodules appeared on both LE. Based on the negative culture results and the fact that the patient had been treated with flucytosine and fluconazole, we suspected that the nodules had been caused by IRIS. It was difficult to diagnose Cryptococcus-induced NF and paradoxical IRIS. Cooperation from other specialists was essential. We think this patient needed earlier and more definitive debridement. Fortunately, we were able to save the patient's life and maintain his LE function. In immunocompromised patients, cryptococcus can be a pathogen. In addition, IRIS can occur during treatment. Management of IRIS is the capital point of sepsis management, careful anti-inflammatory drug control by specialists is required. • A case of necrotizing fasciitis due to cryptococcosis in both lower extremity of a kidney transplant patient • Debridement and systemic drug treatment saved the patient's life. • Extensive necrosis of the gastrocnemius tendon was noted. However, we could maintain the patient's lower limb function. • The patient also developed immune reconstitution syndrome. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
46. Direct imprinting on chalcogenide glass and fabrication of infrared wire-grid polarizer
- Author
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Fédéli, Jean-Marc, Vivien, Laurent, Smit, Meint K., Yamada, Itsunari, Yamashita, Naoto, Einishi, Toshihiko, Saito, Mitsunori, Fukumi, Kouhei, and Nishii, Junji
- Published
- 2013
- Full Text
- View/download PDF
47. Design and fabrication of an achromatic infrared wave plate with Sb–Ge–Sn–S system chalcogenide glass
- Author
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Yamada, Itsunari, Yamashita, Naoto, Einishi, Toshihiko, Saito, Mitsunori, Fukumi, Kouhei, and Nishii, Junji
- Abstract
We designed and fabricated an achromatic infrared wave plate. To examine its phase retardation characteristics, the birefringence was calculated using the effective medium theory. A wave plate with a subwavelength grating was fabricated by direct imprint lithography on a low toxic chalcogenide glass (Sb–Ge–Sn–S system) based on calculated results. As a result of imprinting onto chalcogenide glass by a glassy carbon mold, a grating with 1.63 μm depth, a fill factor of 0.7, and a 3 μm period was obtained. The phase retardation of the elements reached around 30° in the 8.5–10.5 μm wavelength range. The fabrication of the infrared wave plate is less costly compared with conventional crystalline wave plates.
- Published
- 2013
48. Chromosomes without a 30-nm chromatin fiber
- Author
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Joti, Yasumasa, Hikima, Takaaki, Nishino, Yoshinori, Kamada, Fukumi, Hihara, Saera, Takata, Hideaki, Ishikawa, Tetsuya, and Maeshima, Kazuhiro
- Abstract
How is a long strand of genomic DNA packaged into a mitotic chromosome or nucleus? The nucleosome fiber (beads-on-a-string), in which DNA is wrapped around core histones, has long been assumed to be folded into a 30-nm chromatin fiber, and a further helically folded larger fiber. However, when frozen hydrated human mitotic cells were observed using cryoelectron microscopy, no higher-order structures that included 30-nm chromatin fibers were found. To investigate the bulk structure of mitotic chromosomes further, we performed small-angle X-ray scattering (SAXS), which can detect periodic structures in noncrystalline materials in solution. The results were striking: no structural feature larger than 11 nm was detected, even at a chromosome-diameter scale (~1 μm). We also found a similar scattering pattern in interphase nuclei of HeLa cells in the range up to ~275 nm. Our findings suggest a common structural feature in interphase and mitotic chromatins: compact and irregular folding of nucleosome fibers occurs without a 30-nm chromatin structure.
- Published
- 2012
- Full Text
- View/download PDF
49. Fabrication of near- or mid-infrared wire-grid polarizers with WSi wires
- Author
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Yamada, Itsunari, Fukumi, Kohei, Nishii, Junji, and Saito, Mitsunori
- Abstract
We fabricated a subwavelength-grating structure on the Y2O3ceramic substrate, which has higher transparency than silicon in the mid-infrared range. After coating a photoresist on this substrate, we formed a grating pattern of 350-nm pitch by the two-beam interference of the He-Cd laser (325-nm wavelength). By using this photoresist grating as a mask, WSi was etched with reactive SF6 ions. The transmittance of the transverse magnetic (TM) polarization was greater than 70% in the 3-7-m wavelength range without antireflection films and the extinction ratio was over 20 dB in the 2.5-5-m wavelength range. In addition, we also fabricated near-infrared wire-grid polarizer consisting of a 230-nm pitch WSi grating on a SiO2substrate. The TM polarization transmittance of the fabricated polarizer exceeded 80% in the 1000-1600-nm wavelength range. The extinction ratio was higher than 20 dB in the 650-1500-nm wavelength range.
- Published
- 2012
- Full Text
- View/download PDF
50. Glass imprint process for optical device fabrication
- Author
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Kitamura, Naoyuki, Fukumi, Kohei, and Nishii, Junji
- Abstract
An antireflective two-dimensional subwavelength structure and a one-dimensional periodic structure with large phase retardation were fabricated on the glass surfaces by glass-imprint process. Novel low-Tg optical glasses based on bismuth phosphate and bismuth borate systems have been developed for the fabrication of these structures. These glasses had refractive indexes higher than 1.8 and deformation temperatures lower than 500 °C. Antireflective structure optimized by rigorous coupled-wave analysis was fabricated on an SiC mold having a curved surface for lens formation by using electron-beam lithography and dry etching techniques. Reflectivity at the imprinted surface relief decreased to about one-tens as compared with that at the polished surface in the visible region, and had less dependence on incident angle and wavelength. Mold shape has been optimized to fabricate one-dimensional structure with a high aspect ratio. A phase retardation of 0.23 was observed between TE- and TM-polarized beams at 400 nm in the glass plate on both the surfaces of which one-dimensional structures were fabricated.
- Published
- 2011
- Full Text
- View/download PDF
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