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Katsuyuki Aoki,Masamitsu Serikawa,Takuya Harada,Akinobu Usami 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.2
The root canal morphology undergoes aging-related changes, and relevant quantitative analyses have not yetbeen reported. We compared the cone beam computed tomography (CBCT) and micro-computed tomography (micro-CT) scans of extracted mandibular incisors to check the accuracy of morphological measurements. Thereafter, the root canal morphology and aging-related changes in the mandibular incisors of Japanese individuals were assessed using CBCT. Six extracted teeth were fixed in a phantom head and imaged using CBCT and micro-CT. The correlation between the findings of the two imaging modalities was examined. Further, CBCT reconstructed images of the mandibular incisors of 81 individuals were observed. Age-related changes of the root canals were compared between participants aged <30 years and those aged ≥30 years. The CBCT and micro-CT findings regarding the root canals of the extracted teeth coincided in 94.4% of the cases. Mandibular incisors exhibiting two root canals in either cross-section accounted for 9.9% of central incisors and 12.4% of lateral incisors. Mandibular central incisors with two root canals were observed in two (6.3%) individuals aged <30 years and six (12.2%) aged ≥30 years. Mandibular lateral incisors with two root canals were observed in one (3.1%) individual aged <30 years and nine (18.4%) aged ≥30 years. CBCT allows accurate evaluation of complex root canal morphologies and is useful for endodontic preoperative assessment. Mandibular incisors have more frequent occurrence of two root canals with aging.
An algorithm for computing a sequence of Richelot isogenies
Katsuyuki Takashima,Reo Yoshida 대한수학회 2009 대한수학회보 Vol.46 No.4
We show that computation of a sequence of Richelot isogenies from specified supersingular Jacobians of genus-2 curves over F_(p) can be executed in F_{p^2} or F_{p^4}. Based on this, we describe a practical algorithm for computing a Richelot isogeny sequence. We show that computation of a sequence of Richelot isogenies from specified supersingular Jacobians of genus-2 curves over F_(p) can be executed in F_{p^2} or F_{p^4}. Based on this, we describe a practical algorithm for computing a Richelot isogeny sequence.
A new data of worker polymorphism in the ant genus Dorylus (Hymenoptera: Formicidae: Dorylinae)
Katsuyuki Eguchi,Viet Tuan Bui,Emiko Oguri,Munetoshi Maruyama,Seiki Yamane 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.1
Recently, in southern and central Vietnam, foraging columns of D. orientalis which contained not only “typical”workers but also a few “atypical” workers were collected. The atypicalworker mentioned above is characterizedby a set of the following features: (1) head narrowed anteriorly, (2)median portion of clypeus strongly projectinganteriad, and (3) antenna 8-segmented. Sequences of the 658-base standard mitochondrial DNA barcoding regionwere completely identical between typical and atypical workers. Therefore, the condition observed was acase of worker polymorphism within a colony. The mode of polymorphismobserved has the following interestingaspects: (1) workers are clearly subdivided into two series by a set of qualitative characters; (2) the “typicalseries” is numerically much more dominant than the “atypical series” (the latter occupied less than 1% of thewhole of the workers collected); (3) a wider size variation was observed in the former (HW, 0.48–1.41 mm;ML, 0.42–1.12 mm) than in the latter (HW, 0.44–1.13 mm; ML, 0.35–0.79 mm); and (4) within the atypical series,smaller workers are numericallymuch dominant. Rareness of theworkers belonging to the atypical series inforaging column as well as morphological differences between the two series suggests a certain possibility thatthe atypical series does not adapt to foraging but to other tasks in the colony's life history.
Katsuyuki Sakanaka,Satoshi Itasaka,Yuichi Ishida,Kota Fujii,Takahiro Horimatsu,Takashi Mizowaki,Yoshiharu Sakai,Masahiro Hiraoka 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.4
Purpose: The purpose of this study was to explore the dosimetric difference between simultaneous integrated boost intensitymodulated radiotherapy (SIB-IMRT) and three-dimensional conformal radiotherapy (3DCRT), and the clinical outcomes of anal squamous cell carcinoma (ASCC) chemoradiotherapy featuring SIB-IMRT. Materials and Methods: This study included ten patients with ASCC who underwent chemoradiotherapy using SIB-IMRT with 5-fluorouracil and mitomycin C. SIB-IMRT delivered 54 Gy to each primary tumor plus metastatic lymph nodes and 45 Gy to regional lymph nodes, in 30 fractions. Four patients received additional boosts to the primary tumors and metastatic lymph nodes; the median total dose was 54 Gy (range, 54 to 60 Gy). We additionally created 3DCRT plans following the Radiation Therapy Oncology Group 9811 protocol to allow dosimetric comparisons with SIB-IMRT. Locoregional control, overall survival, and toxicity were calculated for the clinical outcome evaluation. Results: Compared to 3DCRT, SIB-IMRT significantly reduced doses to the external genitalia, bladder, and intestine, delivering the doses to target and elective nodal region. At a median follow-up time of 46 months, 3-year locoregional control and overall survival rates were 88.9% and 100%, respectively. Acute toxicities were treated conservatively. All patients completed radiotherapy with brief interruptions (range, 0 to 2 days). No patient experienced ≥grade 3 late toxicity during the follow-up period. Conclusion: The dosimetric advantages of SIB-IMRT appeared to reduce the toxicity of chemoradiotherapy for ASCC achieving high locoregional control in the extended period.
Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The authors are tackling the development of novel chemical sensor elements for detecting air pollutants. The base material of the sensor elements is porous glass, which has favorable features such as transparency and porosity. The sensor elements were prepared by impregnating reagents in a sheet of porous glass. The reagents were the Saltzman reagent for the detection of nitrogen dioxide, β-diketones for formaldehyde and potassium iodide for oxidant. The resultant elements were colorless. The first element was highly sensitive and changed to clear wine red upon exposures to nitrogen dioxide. The second element for formaldehyde developed yellow and was detectable as low as a few tens ppb for an exposure time of 8 h. The third element for oxidant also showed high sensitivity. Evaluation of the effects of various gases on these elements, which are indispensable in applying them to the real atmosphere, is underway except for the NO2 elements. The concept leading to the present study is briefly explained.
Immunomodulatory Effects of Ambroxol on Airway Hyperresponsiveness and Inflammation
Katsuyuki Takeda,Nobuaki Miyahara,Shigeki Matsubara,Christian Taube,Kenichi Kitamura,Astushi Hirano,Mitsune Tanimoto,Erwin W Gelfand 대한면역학회 2016 Immune Network Vol.16 No.3
Ambroxol is used in COPD and asthma to increase mucociliary clearance and regulate surfactant levels, perhaps through anti-oxidant and anti-inflammatory activities. To determine the role and effect of ambroxol in an experimental model of asthma, BALB/c mice were sensitized to ovalbumin (OVA) followed by 3 days of challenge. Airway hyperresponsiveness (AHR), lung cell composition and histology, and cytokine and protein carbonyl levels in bronchoalveolar lavage (BAL) fluid were determined. Ambroxol was administered either before the first OVA challenge or was begun after the last allergen challenge. Cytokine production levels from lung mononuclear cells (Lung MNCs) or alveolar macrophages (AM) were also determined. Administration of ambroxol prior to challenge suppressed AHR, airway eosinophilia, goblet cell metaplasia, and reduced inflammation in subepithelial regions. When given after challenge, AHR was suppressed but without effects on eosinophil numbers. Levels of IL-5 and IL- 13 in BAL fluid were decreased when the drug was given prior to challenge; when given after challenge, increased levels of IL-10 and IL-12 were detected. Decreased levels of protein carbonyls were detected in BAL fluid following ambroxol treatment after challenge. In vitro , ambroxol increased levels of IL-10, IFN-γ, and IL-12 from Lung MNCs and AM, whereas IL-4, IL-5, and IL-13 production was not altered. Taken together, ambroxol was effective in preventing AHR and airway inflammation through upregulation of Th1 cytokines and protection from oxidative stress in the airways.