著者 Morimoto, Naoki| Suzuki, Hideyuki| Takeuchi, Yasuo| Kawaguchi, Shogo| Kunisu, Masahiro| Bielawski, Christopher W.| Nishina, Yuta|
抄録 Graphite oxide (GO) and its constituent layers (i.e., graphene oxide) display a broad range of functional groups and, as such, have attracted significant attention for use in numerous applications. GO is commonly prepared using the “Hummers method” or a variant thereof in which graphite is treated with KMnO4 and various additives in H2SO4. Despite its omnipresence, the underlying chemistry of such oxidation reactions is not well understood and typically affords results that are irreproducible and, in some cases, unsafe. To overcome these limitations, the oxidation of graphite under Hummers-type conditions was monitored over time using in situ X-ray diffraction and in situ X-ray absorption near edge structure analyses with synchrotron radiation. In conjunction with other atomic absorption spectroscopy, UV–vis spectroscopy and elemental analysis measurements, the underlying mechanism of the oxidation reaction was elucidated, and the reaction conditions were optimized. Ultimately, the methodology for reproducibly preparing GO on large scales using only graphite, H2SO4, and KMnO4 was developed and successfully adapted for use in continuous flow systems.
備考 2018年3月公開予定
発行日 2017-03-02
出版物タイトル Chemistry of Materials
29巻
5号
出版者 American Chemical Society
開始ページ 2150
終了ページ 2156
ISSN 15205002
NCID AA12096771
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 Copyright © 2017 American Chemical Society
論文のバージョン author
Web of Sience KeyUT 000396639400027
関連URL https://doi.org/10.1021/acs.chemmater.6b04807
JaLCDOI 10.18926/AMO/55210
フルテキストURL 71_3_259.pdf
著者 Kawana, Shinichi| Yamamoto, Hiromasa| Maki, Yuho| Sugimoto, Seiichiro| 71427522| Miyoshi, Shinichiro|
抄録  Primary sternal chondrosarcoma is a rare malignant tumor that is refractory to chemotherapy and radiation. Effective therapy is radical resection of the tumor. We present two patients with primary sternal chondrosarcoma who underwent a radical resection of the lower half of the sternum and bilateral ribs, followed by reconstruction with 2 sheets of polypropylene mesh layered orthogonally. The patients have maintained almost the same pulmonary function as preoperative values, with stability of the chest wall. Although there are various ways to reconstruct the anterior chest wall, reconstruction with polypropylene mesh layered orthogonally is an easy-to-use and sufficient method.
キーワード chondrosarcoma sternum reconstruction polypropylene mesh
Amo Type Case Report
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 259
終了ページ 262
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/10
JaLCDOI 10.18926/AMO/55209
フルテキストURL 71_3_255.pdf
著者 Kumase, Fumiaki| Morizane, Yuki| Kimura, Shuhei| Toshima, Shinji| Shiraga, Fumio|
抄録  Parafoveal retinal holes (PRHs) are one of the complications that can occur after internal limiting membrane (ILM) peeling during macular surgery. Here we describe a patient in whom an exceptionally large PRH (1,069-μm dia.) was successfully closed by repeated autologous ILM transplantation.
キーワード autologous internal limiting membrane transplantation parafoveal retinal hole, macular surgery
Amo Type Case Report
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 255
終了ページ 257
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/9
JaLCDOI 10.18926/AMO/55208
フルテキストURL 71_3_249.pdf
著者 Washio, Kana| Muraoka, Michiko| Kanamitsu, Kiichiro| Oda, Megumi| Shimada, Akira|
抄録  We diagnosed a female infant with Langerhans cell histiocytosis (LCH) who was refractory to conventional chemotherapy. She showed refractory inflammation that was complicated with hemophagocytic lymphohistiocytosis (HLH) during LCH chemotherapy; therefore, we changed the protocol to HLH2004 (dexamethasone, cyclosporine A and VP16). However, there were no signs of hematological recovery. We therefore performed cord blood transplantation with reduced-intensity conditioning, and she achieved complete remission for over 2 years. As salvage therapy for refractory LCH, hematopoietic stem cell transplantation may be a good therapeutic choice, especially when LCH is complicated with HLH.
キーワード langerhans cell histiocytosis (LCH) hemophagocytic lymphohistiocytosis (HLH) hematopoietic stem cell transplantation (HSCT) reduced-intensity conditioning (RIC) refractory
Amo Type Case Report
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 249
終了ページ 254
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/8
JaLCDOI 10.18926/AMO/55207
フルテキストURL 71_3_241.pdf
著者 Iwamuro, Masaya| Tanaka, Shouichi| Moritou, Yuki| Inaba, Tomoki| Higashi, Reiji| Kusumoto, Chiaki| Yunoki, Naoko| Ishikawa, Shin| Okamoto, Yuko| Kawai, Yoshinari| Kitada, Ken-ichi| Takenaka, Ryuta| Toyokawa, Tatsuya| 71245651|
抄録  Most gastric bezoars can be treated with endoscopic fragmentation combined with or without cola dissolution, whereas laparotomy or laparoscopic surgery is generally inevitable for small intestinal bezoars because they cause small bowel obstruction. Therefore, early diagnosis and management of gastric bezoars are necessary to prevent bezoar-induced ileus. To investigate the incidence of overlooked gastric bezoars during the initial esophagogastroduodenoscopy, we retrospectively reviewed the cases of 27 patients diagnosed with gastrointestinal bezoars. The bezoars were diagnosed using esophagogastroduodenoscopy (n=25), abdominal ultrasonography (n=1), and barium follow-through examination (n=1). Bezoars were overlooked in 9/25 patients (36.0%) during the initial endoscopy examination because the bezoars were covered with debris in the stomach. Of the 9 patients, 8 had concomitant gastric ulcers, and the other patient had gastric lymphoma. Although a computed tomography (CT) scan was performed before the second-look endoscopy in 8 of the 9 patients, the bezoars were mistaken as food debris on CT findings and were overlooked in these patients. In conclusion, gastric bezoars may not be discovered during the initial esophagogastroduodenoscopy and CT scan. In cases with debris in the stomach, second-look endoscopy is essential to detect bezoars.
キーワード bezoar gastric ulcer foreign bodies phytobezoar
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 241
終了ページ 247
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/7
JaLCDOI 10.18926/AMO/55206
フルテキストURL 71_3_233.pdf
著者 Shimoyama, Kyoko| Osako, Tomo| Mitsuhashi, Toshiharu| Akiyama, Futoshi| Iwase, Takuji|
抄録 Ductal carcinoma in situ (DCIS) of the breast has no potential to metastasize, but over 20% of cases preoperatively diagnosed as DCIS are upstaged on final pathology. The rates of upstaging and the predictors for invasion on final pathology were evaluated. For 240 primary breast cancers, radiological findings on mammography, ultrasonography, and magnetic resonance imaging were investigated along with pathological and clinical information. Univariate and multivariate analyses were performed to identify predictors of potential invasion. Of the 240 breast cancers, 68 (28.3%) showed invasion on final pathology, and 5 (2.5%) had sentinel node metastasis. The multivariate analysis identified five independent predictors: non-mass lesions >2.4 cm on ultrasonography (odds ratio [OR] 2.84, 95% confidence interval [CI] 1.02-7.95, p=0.047), comedo-type histology (OR 6.89, 95% CI 1.89-25.08, p<0.01), solid-type histology (OR 7.97, 95% CI 2.08-30.49, p<0.01), palpable mass (OR 2.63, 95% CI 1.05-6.64, p=0.04), and bloody nipple discharge (OR 4.61, 95% CI 1.20-17.66, p=0.02). These five predictors were associated with invasion on final pathology and may help select candidates for sentinel node biopsy.
キーワード breast cancer DCIS breast needle biopsy imaging examination sentinel node biopsy
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 233
終了ページ 240
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/6
JaLCDOI 10.18926/AMO/55205
フルテキストURL 71_3_227.pdf
著者 Sasaki, Katsumi| Wada, Koichiro| Araki, Motoo| Kobayashi, Yasuyuki| Sugimoto, Morito| Ebara, Shin| 71471072| Nasu, Yasutomo|
抄録  We elucidate the fate of cases clinically suspected of carcinoma in situ (Cis) of the upper tract with serial ureteroscopy. Of 143 patients who underwent ureteroscopy for suspected upper tract urothelial carcinoma (UTUC) between January 2008 and February 2016, 12 cases with consistently positive urine cytology and poorly detectable upper-tract malignancies by imaging were reviewed. In these 12 patients, 19 ureteroscopy procedures (25 renal units) were performed. Vesical random biopsy was performed before the 1st ureteroscopy to exclude malignancy of the bladder in all 12 cases. Median follow-up was 42 (13-67) months. Positive biopsy results at the 1st ureteroscopy were obtained in 3 (25%) patients and all were diagnosed wth Cis of the upper tract. Two (17%) of 9 patients who were negative or inconclusive at the 1st ureteroscopy were finally diagnosed as UTUC, but plural ureteroscopy procedures were needed for the diagnoses in both. Carcinoma of the bladder appeared in 5 (42%) patients during follow-up, despite the earlier ruling out of vesical malignancy. Four (33%) of those 5 patients never developed upper-tract urothelial carcinoma during follow-up. Caution is required before undertaking radical surgery for cases clinically suspected of Cis of the upper tract. In our experience, only 42% of such patients developed UTUC; another 33% eventually developed carcinoma of the bladder without UTUC.
キーワード carcinoma in situ carcinoma of the bladder upper tract urothelial carcinoma ureteroscopy urine cytology
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 227
終了ページ 232
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/5
JaLCDOI 10.18926/AMO/55204
フルテキストURL 71_3_219.pdf
著者 Takakura, Hiroaki| Domae, Shohei| Ono, Toshiro| 71054363|
抄録  Anticancer drugs induce cell-cycle arrest and apoptosis not only in tumor cells, but also in immune cells. However, many preclinical and clinical findings show that some chemotherapeutic agents can improve the antitumor efficacy of immunotherapy. We immunohistochemically analyzed the degree of immune cell infiltration and the relevance of programmed cell death 1 ligand-1 (PD-L1) expression in surgically resected oral squamous cell carcinoma (OSCC) specimens from patients who had undergone pretreatment with certain chemotherapies and other patients without pretreatment. We divided the patients into the group of neoadjuvant chemotherapy (NAC) patients (n=8) and the nNAC (without NAC) patient group (n=10). We observed that NAC induced infiltrations of CD4, CD8 T cells and CD56 NK cells into the tumor microenvironment. Decreased numbers of Tregs and PD-1-positive cells were observed in the NAC group. No significant difference was observed in the degree of immune-cell infiltration between the patient groups except for CD56 NK cells in the stroma and PD-1 cells in cancer nests. Eighty percent of the nNAC specimens showed intermediate-to-strong PD-L1 protein expression, whereas 75% of the NAC specimens showed down-regulation of the PD-L1 protein, indicating the effectiveness of the chemotherapeutic treatment before surgery.
キーワード oral squamous cell carcinoma programmed cell death 1 ligand-1 tumor microenvironment neoadjuvant chemotherapy immunohistochemistry
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 219
終了ページ 226
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/4
JaLCDOI 10.18926/AMO/55203
フルテキストURL 71_3_209.pdf
著者 Xin, Zhao| Tsuda, Toshihide| Doi, Hiroyuki|
抄録 We evaluated how exposure to airborne volatile organic compounds emitted from a plastic recycling facility affected nearby residents, in a cross-sectional study. Individuals>10 years old were randomly sampled from 50 households at five sites and given questionnaires to complete. We categorized the subjects by distance from the recycling facility and used this as a proxy measure for pollutant exposure. We sought to improve on a preceding study by generating new findings, improving methods for questionnaire distribution and collection, and refining site selection. We calculated the odds of residents living 500 or 900 m away from the facility reporting mucocutaneous and respiratory symptoms using a reference group of residents 2,800 m away. Self-reported nasal congestion (odds ratio=3.0, 95% confidence interval=1.02-8.8), eczema (5.1, 1.1-22.9), and sore throat (3.9, 1.1-14.1) were significantly higher among residents 500 m from the facility. Those 900 m away were also considerably more likely to report experiencing eczema (4.6, 1.4-14.9). Air pollution was found responsible for significantly increased reports of mucocutaneous and respiratory symptoms among nearby residents. Our findings confirm the effects of pollutants emitted from recycling facilities on residents’ health and clarify that study design differences did not affect the results.
キーワード air pollutants volatile organic compounds recycling facility mucocutaneous symptoms respiratory symptoms
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 209
終了ページ 217
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/3
JaLCDOI 10.18926/AMO/55202
フルテキストURL 71_3_201.pdf
著者 Matsuda, Miwa| Sasaki, Aiko| Shimizu, Keiko| Kamada, Yasuhiko| Noguchi, Soichi| Hiramatsu, Yuji| Nakatsuka, Mikiya|
抄録  Vascular dysfunction has been reported in women with recurrent pregnancy loss (RPL). We investigated the severity of vascular dysfunction in non-pregnant women with RPL and its correlation with anti-heat shock protein (HSP) antibodies that are known to induce arteriosclerosis. We measured the serum anti-HSP60 antibodies, anti-HSP70 antibodies, and anti-phospholipid antibodies (APA) in 68 women with RPL and 29 healthy controls. Among the women with RPL, 14 had a diagnosis of antiphospholipid syndrome (APS), and in the remaining 54, the causes for RPL were unexplained. Compared to the controls, the brachial-ankle pulse wave velocity (baPWV), carotid augmentation index (cAI), and uterine artery pulsatility index (PI) were all significantly higher in the women with both APS and unexplained RPL. Compared to the controls, the anti-HSP60 antibody levels were significantly higher in the APA-positive group of women with unexplained RPL, and the anti-HSP70 antibody levels were significantly higher in APS and APA-positive group of women with unexplained RPL. However, the anti-HSP60 and anti-HSP70 antibody levels did not correlate with the values of baPWV or cAI. Our results demonstrated anti-HSP60 and anti-HSP70 antibodies are increased in women with unexplained RPL. Further studies are needed to elucidate the roles of anti-HSP antibodies and their pathophysiology in unexplained RPL.
キーワード recurrent pregnancy loss autoantibody heat shock protein pulse wave velocity arterial stiffness
Amo Type Original Article
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 201
終了ページ 208
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/2
JaLCDOI 10.18926/AMO/55201
フルテキストURL 71_3_191.pdf
著者 Kobayashi, Katsuhiro| Akiyama, Tomoyuki| Agari, Takashi| Sasaki, Tatsuya| Shibata, Takashi| Hanaoka, Yoshiyuki| Akiyama, Mari| Endoh, Fumika| Oka, Makio| Date, Isao|
抄録  Electroencephalogram (EEG) data include broadband electrical brain activity ranging from infra-slow bands (< 0.1 Hz) to traditional frequency bands (e.g., the approx. 10 Hz alpha rhythm) to high-frequency bands of up to 500 Hz. High-frequency oscillations (HFOs) including ripple and fast ripple oscillations (80-200 Hz and>200 / 250 Hz, respectively) are particularly of note due to their very close relationship to epileptogenicity, with the possibility that they could function as a surrogate biomarker of epileptogenicity. In contrast, physiological high-frequency activity plays an important role in higher brain functions, and the differentiation between pathological / epileptic and physiological HFOs is a critical issue, especially in epilepsy surgery. HFOs were initially recorded with intracranial electrodes in patients with intractable epilepsy as part of a long-term invasive seizure monitoring study. However, fast oscillations (FOs) in the ripple and gamma bands (40-80 Hz) are now noninvasively detected by scalp EEG and magnetoencephalography, and thus the scope of studies on HFOs /FOs is rapidly expanding.
キーワード fast oscillations, epilepsy electroencephalogram time-frequency analysis
Amo Type Review
発行日 2017-06
出版物タイトル Acta Medica Okayama
71巻
3号
出版者 Okayama University Medical School
開始ページ 191
終了ページ 200
ISSN 0386-300X
NCID AA00508441
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 CopyrightⒸ 2017 by Okayama University Medical School
論文のバージョン publisher
査読 有り
Submission Path amo/vol71/iss3/1
フルテキストURL K0005453_other1.pdf K0005453_other1 Table.pdf
著者 Nobumoto, Etsuko| Masuyama, Hisashi| Hiramatsu, Yuji| Sugiyama, Takashi| Kusaka, Hideto| Toyoda, Nagayasu|
抄録 Background The new diagnostic criteria for gestational diabetes mellitus (GDM), proposed by the International Association of Diabetes and Pregnancy Study Groups in 2010, were recently accepted in Japan. Therefore, the frequency of GDM is four times higher than previously recorded. This means that GDM has become a more clinically important disease. This study aimed to assess how the number of patients with GDM as well as its complications have changed after adoption of the new criteria. Methods A total of 3,610 pregnant women in the Japan Assessment of GDM Screening Trial and Okayama University Hospital were included. We analyzed the prevalence of GDM and its complications using the old and new criteria. Results The prevalence of perinatal outcomes was increased by adopting the new criteria. There were many important perinatal complications in the additional new GDM criteria; therefore, patients with mild GDM, such as one-point disorder patients, should have careful interventions. Admission to the neonatal intensive care unit was significantly increased (p = 0.01) according to the new GDM criteria because the old criteria were stricter than the new ones. GDM patients with obesity (BMI ≥ 25 kg/m2) had a high frequency of perinatal complications that could require active intervention and strict follow-up. Conclusions Because the new GDM criteria greatly affect perinatal complications, intervention for GDM starting at an early stage and strict follow-up (especially GDM with obesity) are important for reducing complications as well as the incidence of diabetes and metabolic syndrome in the mother and child.
キーワード New GDM criteria Perinatal complications Obesity 75-g oral glucose tolerance test
備考 The final publication is available at Springer 学位審査副論文
発行日 2015-09
出版物タイトル Diabetology International
6巻
3号
出版者 Springer Japan
開始ページ 226
終了ページ 231
ISSN 21901678
NCID AA12503387
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン author
Web of Sience KeyUT 000366631000009
関連URL http://doi.org/10.1007/s13340-014-0193-8 http://ousar.lib.okayama-u.ac.jp/55005
著者 Tamura, Kei| Kobayashi, Yasuhisa| Hirooka, Asuka| Takanami, Keiko| Oti, Takumi| Jogahara, Takamichi| Oda, Sen-ichi| Sakamoto, Tatsuya| Sakamoto, Hirotaka|
抄録 Several regions of the brain and spinal cord control male reproductive function. We previously demonstrated that the gastrin-releasing peptide (GRP) system, located in the lumbosacral spinal cord of rats, controls spinal centers to promote penile reflexes during male copulatory behavior. However, little information exists on the male-specific spinal GRP system in animals other than rats. The objective of this study was to examine the functional generality of the spinal GRP system in mammals using the Asian house musk shrew (Suncus murinus; suncus named as the laboratory strain), a specialized placental mammal model. Mice are also used for a representative model of small laboratory animals. We first isolated complementary DNA encoding GRP in suncus. Phylogenetic analysis revealed that suncus preproGRP was clustered to an independent branch. Reverse transcription-PCR showed that GRP and its receptor mRNAs were both expressed in the lumbar spinal cord of suncus and mice. Immunohistochemistry for GRP demonstrated that the sexually dimorphic GRP system and male-specific expression/distribution patterns of GRP in the lumbosacral spinal cord in suncus are similar to those of mice. In suncus, we further found that most GRP-expressing neurons in males also express androgen receptors, suggesting that this male-dominant system in suncus is also androgen-dependent. Taken together, these results indicate that the sexually dimorphic spinal GRP system exists not only in mice but also in suncus, suggesting that this system is a conserved property in mammals.
キーワード RRID AB_2060157 RRID: AB_2571636 RRID: AB_626757 Suncus murinus (suncus) gastrin-releasing peptide male reproductive function sexual dimorphism spinal cord
備考 This is the peer reviewed version of the following article: Tamura K. Kobayashi Y. Hirooka A. et al. Identification of the sexually dimorphic gastrin-releasing peptide system in the lumbosacral spinal cord that controls male reproductive function in the mouse and Asian house musk shrew (Suncus murinus). J Comp Neurol. 2017;525:1601–1613. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. 2018年5月公開予定
発行日 2017-05-01
出版物タイトル Journal of Comparative Neurology
525巻
7号
出版者 Wistar Institute of Anatomy and Biology
開始ページ 1586
終了ページ 1598
ISSN 0021-9967
NCID AA00695917
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン author
PubMed ID 27804131
Web of Sience KeyUT 000397559700004
関連URL https://doi.org/10.1002/cne.24138
著者 Niho, Akiko| Yoshizawa, Susumu| Tsukamoto, Takashi| Kurihara, Marie| Tahara, Shinya| Nakajima, Yu| Mizuno, Misao| Kuramochi, Hikaru| Tahara, Tahei| Mizutani, Yasuhisa| Sudo, Yuki|
抄録 In organisms, ion transporters play essential roles in the generation and dissipation of ion gradients across cell membranes. Microbial rhodopsins selectively transport cognate ions using solar energy, in which the substrate ions identified to date have been confined to monovalent ions such as H+, Na+, and Cl-. Here we report a novel rhodopsin from the cyanobacterium Synechocystis sp. PCC 7509, which inwardly transports a polyatomic divalent sulfate ion, SO42-, with changes of its spectroscopic properties in both unphotolyzed and photolyzed states. Upon illumination, cells expressing the novel rhodopsin, named Synechocystis halorhodopsin (SyHR), showed alkalization of the medium only in the presence of Cl- or SO42-. That alkalization signal was enhanced by addition of a protonophore, indicating an inward transport of Cl- and SO42- with a subsequent secondary inward H+ movement across the membrane. The anion binding to SyHR was suggested by absorption spectral shifts from 542 to 536 nm for Cl- and from 542 to 556 nm for SO42-, and the affinities of Cl- and SO42- were estimated as 0.112 and 5.81 mM, respectively. We then performed time-resolved spectroscopic measurements ranging from femtosecond to millisecond time domains to elucidate the structure and structural changes of SyHR during the photoreaction. Based on the results, we propose a photocycle model for SyHR in the absence or presence of substrate ions with the timing of their uptake and release. Thus, we demonstrate SyHR as the first light-driven polyatomic divalent anion (SO42-) transporter and report its spectroscopic characteristics.
備考 This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. 2018年4月公開予定
発行日 2017-03-29
出版物タイトル Journal of the American Chemical Society
139巻
12号
出版者 American Chemical Society
開始ページ 4376
終了ページ 4389
ISSN 00027863
NCID AA00692602
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン author
PubMed ID 28257611
Web of Sience KeyUT 000398247100034
関連URL https://doi.org/10.1021/jacs.6b12139
著者 Okada, Masahiro| Nakai, Akira| Hara Emilio, Satoshi| Taguchi, Tetsushi| Nakano, Takayoshi| Matsumoto, Takuya|
抄録 Over the past few years, the development of novel adhesives for biological soft tissue adhesion has gained significant interest. Such adhesives should be non-toxic and biocompatible. In this study, we synthesized a novel solid adhesive using nanostructured hydroxyapatite (HAp) and evaluated its physical adhesion properties through in vitro testing with synthetic hydrogels and mouse soft tissues. The results revealed that HAp-nanoparticle dispersions and HAp-nanoparticle-assembled nanoporous plates showed efficient adhesion to hydrogels. Interestingly, the HAp plates showed different adhesive properties depending upon the shape of their nanoparticles. The HAp plate made up of 17 nm-sized nanoparticles showed an adhesive strength 2.2 times higher than that of the conventional fibrin glue for mouse skin tissues.
キーワード Hydroxyapatite Nanoparticle Solid adhesive Wet adhesion
備考 2019年6月公開予定
発行日 2017-05
出版物タイトル Acta Biomaterialia
出版者 Elsevier B.V.
ISSN 1742-7061
NCID AA12033647
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
著作権者 © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
論文のバージョン author
PubMed ID 28483692
関連URL https://doi.org/10.1016/j.actbio.2017.05.014
タイトル(別表記) Identification of Marker Gene of Pars Tuberalis Morphogenesis in Chicken Embryo. The expression of Cytokine-like 1 and Gap junction protein alpha 5 in the pars tuberalis
フルテキストURL poalas_033_031_034.pdf
著者 相澤 清香| 檜垣 佑理子| 御輿 真穂| 竹内 栄| 高橋 純夫|
抄録 Adenohypophysis delivered from oral ectoderm consists of pars distalis (PD), pars intermedia and pars tuberalis (PT). The mechanisms of development of PD has been well studied, and the cell differentiation of PD has been well understood. However, the morphogenesis and the differentiation of PT are still unclear, and the gene expression during the PT development remains largely unknown. In this study, we explored the specifically expressing genes in PT during development and analyzed its spatiotemporal expressions pattern. Microarray analysis on laser-captured PT and PD tissues obtained from chicken embryos on embryonic day 10 (E10.0) showed high expressing genes, Cytokine-like 1 (CYTL1) and Gap junction protein alpha 5 (GJA5) in PT. A detail analysis of spatiotemporal expressions pattern during chick embryo development by in situ hybridization revealed that CYTL1 mRNA was first detected in lateral head ectoderm and ventral head ectoderm in E1.5. The CYTL1 expressions moved into Rathke’s pouch at E2.5, then it was localized in PT primordium and continuously expressed in PT primordium until E12.0. On the other hand, GJA5 mRNA was transiently detected in PT primordium from E6 to E14.0, while the expression was not detected in PD during development. These results suggested that these genes may be involved in the regulation mechanism of PT development and could be a useful marker in the PT development.
備考 寄稿(Contribution)
出版物タイトル 岡山実験動物研究会報
発行日 2017-04
33巻
出版者 岡山実験動物研究会
出版者(別表記) Okayama Association for Laboratory Animal Science
開始ページ 31
終了ページ 34
資料タイプ 学術雑誌論文
言語 Japanese
論文のバージョン publisher
査読 無し
Sort Key 11
Eprints Journal Name poalas
タイトル(別表記) Structure and function of tegmentum vasculosum in avian cochlea
フルテキストURL poalas_033_026_030.pdf
著者 池田 理佐| 乙野 剛史| 池田 直矢| 齋藤 昇| 安藤 元紀|
抄録 In spite of the importance of endocochlear DC potential (EP) and the K+-rich endolymph for the avian cochlea, the structure and function of the tegmentum vasculosum (TV) has not yet been fully elucidated, compared with those of the stria vascularis in the mammalian cochlea. In this study, we examined structural analysis of the epithelial cells, gene expressions of Na+-K+-ATPase (Atp1A1) and Kir4.1 (Kcnj10), and protein localizations of Na+-K+-ATPase and Kir4.1, in the TV. Tight junctional structures were observed between epithelial dark cells and light cells in the TV. Both Atp1a1 and Kcnj10 genes were detected in the TV. In addition, immunopositive signals for both Na+-K+-ATPase and Kir4.1 were recognized in the TV. These results indicate that Na+-K+-ATPase and Kir4.1 play roles in maintaining the EP and high K+ concentration of the endolymph. Further studies are needed to clarify the physiological functions of the TV. This is the first report which demonstrates that gene and protein expression data contribute to the avian inner ear homeostasis.
備考 寄稿(Contribution)
出版物タイトル 岡山実験動物研究会報
発行日 2017-04
33巻
出版者 岡山実験動物研究会
出版者(別表記) Okayama Association for Laboratory Animal Science
開始ページ 26
終了ページ 30
資料タイプ 学術雑誌論文
言語 Japanese
論文のバージョン publisher
査読 無し
Sort Key 10
Eprints Journal Name poalas
タイトル(別表記) Taxonomic status of Aco strain derived from spiny mice
フルテキストURL poalas_033_022_025.pdf
著者 持田 瞳| 目加田 和之|
抄録 Spiny mice are useful in regenerative research and as a model for precocial animals. In the present study, we investigated the taxonomic status of the Aco strain, which is derived from spiny mice of an unidentified species. Although this Aco strain has been tentatively considered A. cahirinus species, it was distinguished from this species based on conventional and G-banding chromosomal patterns of this strain. Subsequently, we determined the nucleotide sequence of the mitochondorial gene cytochrome b (Cyb) and constructed a molecular phylogenetic tree. We found that the Aco strain belongs to the same clade as A. dimidiatus. Based on this molecular analysis, we concluded that the Aco strain of spiny mice should be considered A. dimidiatus.
備考 寄稿(Contribution)
出版物タイトル 岡山実験動物研究会報
発行日 2017-04
33巻
出版者 岡山実験動物研究会
出版者(別表記) Okayama Association for Laboratory Animal Science
開始ページ 22
終了ページ 25
資料タイプ 学術雑誌論文
言語 Japanese
論文のバージョン publisher
査読 無し
Sort Key 9
Eprints Journal Name poalas
タイトル(別表記) Inhibitory effects of caffeine on allergic rhinitis symptoms in mice
フルテキストURL poalas_033_018_021.pdf
著者 辻本 まどか| 佐伯 綾希子| 鈴木 真奈美| 白神 俊幸| 杉本 幸雄| 林 泰資|
抄録 We examined the effects of caffeine treatment on ovalbumin- and histamine-induced rhinitis mouse models and on corticosterone and catecholamine levels in mouse plasma. Treatment with caffeine decreased sneezing and nasal rubbing in both models, but direct nasal administration had no effect. Plasma levels of corticosterone and catecholamine, which have known anti-allergy effects, were increased by caffeine treatment. The increases in corticosterone and catecholamine may be associated with the suppression of rhinitis symptoms.
備考 寄稿(Contribution)
出版物タイトル 岡山実験動物研究会報
発行日 2017-04
33巻
出版者 岡山実験動物研究会
出版者(別表記) Okayama Association for Laboratory Animal Science
開始ページ 18
終了ページ 21
資料タイプ 学術雑誌論文
言語 Japanese
論文のバージョン publisher
査読 無し
Sort Key 8
Eprints Journal Name poalas
タイトル(別表記) An Efficient Algorithm to Determine Equivalence of Pipelined Dependency Graphs for Their Simplification
フルテキストURL j100-d_6_616.pdf
著者 籠谷 裕人| 杉山 裕二| 岡本 卓爾|
抄録  依存性グラフに基づいた非同期式パイプライン制御回路の設計方法が提案されている.この設計法の最終段階においては,依存性グラフと縮小した依存性グラフの等価性を何度も繰返し判定することにより,簡単化した依存性グラフが得られる.しかし,この判定には多数の状態をもつオートマトンを扱うため,その計算量は極めて大きい.本論文では,この等価性判定のための新たな効率的なアルゴリズムを提案する.まず,基本操作の実行順序の半順序をコンパクトに表現するために,基本操作直結因果関係グラフ O˙ を定義する.次に,分 岐系列ごとに O˙ の高々二つの部分グラフが一致するとき,かつそのときに限り,二つの依存性グラフが等価であることを証明する.更に,等価性の判定に必要な分岐系列のサイズと数が有限であることを証明する.最後に,上述の原理を用いたアルゴリズムの計算量が従来法に比べて大幅に小さいことを示す.
キーワード 非同期式制御回路 パイプライン 簡単化 因果関係
備考 本研究は,JSPS 科研費 JP24500065,JP16H01723 の助成を受けたものである.
発行日 2017-06-01
出版物タイトル 電子情報通信学会論文誌 D
J100-D巻
6号
出版者 電子情報通信学会
開始ページ 616
終了ページ 626
ISSN 18810225
NCID AA12712944
資料タイプ 学術雑誌論文
言語 Japanese
OAI-PMH Set 岡山大学
著作権者 Copyright (c) by IEICE
論文のバージョン publisher
DOI 10.14923/transinfj.2016JDP7108
オフィシャル URL https://search.ieice.org/|