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Shirota T, Kurabayashi H, Ogura H, Seki K, Maki K, Shintani S. Analysis of bone volume using computer simulation system for secondary bone graft in alveolar cleft. Int J Oral Maxillofac Surg 2010; 39:904-8. [PMID: 20605410 DOI: 10.1016/j.ijom.2010.04.050] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2009] [Revised: 04/28/2010] [Accepted: 04/30/2010] [Indexed: 11/25/2022]
Abstract
The purpose of this study was to measure the bone volume necessary for secondary bone grafting in the alveolar cleft using surgical simulation software based on three-dimensional computed tomography (CT) scan data, to compare this measurement with the actual volume of the bone graft, and to evaluate consistency. The subjects were 13 patients with cleft lip and palate who underwent CT using a cone-beam CT unit (CB-CT) 1 month before surgery, followed by bone grafting with particulate cancellous bone and marrow (PCBM) to close the cleft. The bone volume necessary for grafting was measured based on the CB-CT scan data. Correlation analysis, a test of the population mean between two samples, and Wilcoxon's signed rank test were conducted between these measurements and the actual bone volume (PCBM volume) used for grafting. SPSS was used for statistical analysis, and the level of significance was set below the 5% level. The results showed a significant correlation, with no significant differences between the two in all tests. These results suggest that measuring and preoperatively calculating the bone volume necessary for bone grafting with surgical simulation software using CB-CT scan data is beneficial.
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Seki K. Development of RuO2/Rutile-TiO2 Catalyst for Industrial HCl Oxidation Process. CATALYSIS SURVEYS FROM ASIA 2010. [DOI: 10.1007/s10563-010-9091-7] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Ogawa K, Langlais RP, McDavid WD, Noujeim M, Seki K, Okano T, Yamakawa T, Sue T. Development of a new dental panoramic radiographic system based on a tomosynthesis method. Dentomaxillofac Radiol 2010; 39:47-53. [PMID: 20089744 DOI: 10.1259/dmfr/12999660] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The objective of this study was to develop a new practical method to reconstruct a high-quality panoramic image in which radiographers would be free from the onerous task of correctly locating the patient's jaws within the image layer of the panoramic unit. In addition, dentists would be able to freely select any panoramic plane to be reconstructed after the acquisition of the raw scan data. A high-speed data acquisition device was used with a CdTe (cadmium telluride) semiconductor detector and a sophisticated digital signal-processing technique based on tomosynthesis was developed. The system processes many vertical strip images acquired with the detector and generates a high-resolution and high-contrast image. To apply the tomosynthesis technique to the acquired strip images correctly, the actual movement of the panoramic unit was measured, including the X-ray tube and detector, in a scan using a calibration phantom and the authors generated a shift amount table needed for the shift-and-add tomosynthesis operation. The results of the experiments with a PanoACT-1000 panoramic unit, which was a PC-1000 panoramic unit fitted with a high frame rate semiconductor detector SCAN-300FPC, demonstrated the capability of a tomosynthesis technique which, when applied to the strip images of a dry skull phantom, could change the location and inclination of an imaging plane. This system allowed the extraction of an optimum-quality panoramic image regardless of irregularities in patient positioning. Moreover, the authors could freely reconstruct a fine image of an arbitrary plane with different parameters from those used in the original data acquisition to study fine anatomical details in specific locations.
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Ramachandran S, Komura S, Imai M, Seki K. Drag coefficient of a liquid domain in a two-dimensional membrane. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2010; 31:303-310. [PMID: 20306216 DOI: 10.1140/epje/i2010-10577-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2009] [Revised: 01/28/2010] [Accepted: 02/19/2010] [Indexed: 05/29/2023]
Abstract
Using a hydrodynamic theory that incorporates a momentum decay mechanism, we calculate the drag coefficient of a circular liquid domain of finite viscosity moving in a two-dimensional membrane. We derive an analytical expression for the drag coefficient which covers the whole range of domain sizes. Several limiting expressions are discussed. The obtained drag coefficient decreases as the domain viscosity becomes smaller with respect to the outer membrane viscosity. This is because the flow induced in the domain acts to transport the fluid in the surrounding matrix more efficiently.
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Segawa M, Seki K, Kusajima Y, Saito K. [Primary clear cell adenocarcinoma of the lung with endobronchial polypoid growth: report of a case]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2009; 62:1182-1185. [PMID: 19999100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Clear cell adenocarcinoma with endobronchial polypoid growth of the lung is extremely rare. A 65-year-old male with hemosputum was found to have an abnormal shadow in the hilum of the left lung. Computed tomography of the chest revealed that a heterogeneous mass occupied the lumen extending outside the upper lobe bronchus of the left lung. By biopsy, the tumor was determined to be adenocarcinoma. The patient underwent left pneumonectomy with mediastinal lymph node dissection. Macroscopically, the tumor showed a polypoid growth along with the bronchial tree. Microscopically, most of the tumor was composed of large clear cells with partial glandular formation, indicating the tumor to be adenocarcinoma Lymph node metastasis was seen in #5 and #12u. The lung cancer was diagnosed as clear cell adenocarcinoma with endobronchial polypoid growth.
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Okano T, Harata Y, Sugihara Y, Sakaino R, Tsuchida R, Iwai K, Seki K, Araki K. Absorbed and effective doses from cone beam volumetric imaging for implant planning. Dentomaxillofac Radiol 2009; 38:79-85. [PMID: 19176649 DOI: 10.1259/dmfr/14769929] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Volumetric CT using a cone beam has been developed by several manufacturers for dentomaxillofacial imaging. The purpose of this study was to measure doses for implant planning with cone beam volumetric imaging (CBVI) in comparison with conventional multidetector CT (MDCT). METHODS The two CBVI systems used were a 3D Accuitomo (J. Morita), including an image-intensifier type (II) and a flat-panel type (FPD), and a CB MercuRay (Hitachi). The 3D Accuitomo operated at 80 kV, 5 mA and 18 s. The CB MercuRay operated at 120 kV, 15 mA, 9.8 s. The MDCT used was a HiSpeed QX/i (GE), operated at 120 kV, 100 mA and 0.7 s, and its scan length was 77 mm for both jaws. Measurement of the absorbed tissue and organ doses was performed with an Alderson phantom, embedding the radiophotoluminescence glass dosemeter into the organs/tissues. The values obtained were converted into the absorbed dose. The effective dose as defined by the International Commission on Radiological Protection was then calculated. RESULTS The absorbed doses of the 3D Accuitomo of the organs in the primary beam ranged from 1-5 mGy, and were several to ten times lower than other doses. The effective dose of the 3D Accuitomo ranged from 18 muSv to 66 muSv, and was an order of magnitude smaller than the others. In conclusion, these results show that the dose in the 3D Accuitomo is lower than the CB MercuRay and much less than MDCT.
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Kinoshita T, Yamamoto N, Fujisawa T, Masuda N, Hojo T, Aogi K, Seki K, Tsuda H. A phase II trial of image-guided radiofrequency ablation of small breast carcinomas: Results of a multicenter study in Japan. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.e11535] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
e11535 Background: Locally ablative therapy of early breast cancer represents the next frontier in the evolution of minimally invasive breast conservative therapy. We performed this Phase II trial to determine the efficacy and safety of Radiofrequency (RF) ablation of small localized invasive breast carcinomas as a multicenter study in Japan. Methods: Thirty-nine patients with core-biopsy proven invasive breast cancer, T<2 cm in diameter on ultrasound and MRI were enrolled in this trial. Under ultrasound guidance, the tumor and at least a 5mm margin of surrounding breast tissue were ablated with saline- cooled RF electrode followed by surgical resection. Pathologic and immunohistochemical stains were preformed to assess tumor viability. Results: Thirty-seven patients completed the treatment. The mean tumor size on ultrasound was 1.50 cm. The mean ablation time was 12 minutes using mean power of 80.0 watts. During ablation, the tumor became progressively echogenic that correspond with the region of sever electrocautery injury at pathologic examination. Of the 37 treated patients, H&E and NADPH viability staining was available for 27 patients and in 25 (92.5%), there was no evidence of viable cancer cells. H&E and or ssDNA staining were available for another 10 patients. In total, complete thermal injury to the target lesions was recognized in 33 of 37 treated patients (89.2%). No sever adverse effect on the skin and chest wall were noted. Conclusions: RF ablation is a promising minimally invasive treatment of small breast carcinomas, as it can achieve effective cell killing with a low complication rate. We are planning a multicenter observation study for RF ablation of small breast carcinomas. No significant financial relationships to disclose.
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Kanai K, Nishi T, Iwahashi T, Ouchi Y, Seki K, Harada Y, Shin S. Anomalous electronic structure of ionic liquids determined by soft x-ray emission spectroscopy: Contributions from the cations and anions to the occupied electronic structure. J Chem Phys 2008; 129:224507. [DOI: 10.1063/1.3036925] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mitsuhashi A, Matsui H, Usui H, Nagai Y, Tate S, Unno Y, Hirashiki K, Seki K, Shozu M. Serum YKL-40 as a marker for cervical adenocarcinoma. Ann Oncol 2008; 20:71-7. [PMID: 18723551 DOI: 10.1093/annonc/mdn552] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND The current study examined the clinical usefulness of YKL-40 in detection and prognosis of uterine cervical cancer. PATIENTS AND METHODS Serum levels of YKL-40, cancer antigen 125 (CA 125), carbohydrate antigen 19-9 (CA19-9), and squamous cell carcinoma (SCC) antigen were determined by enzyme-linked immunosorbent assay in women with benign gynecologic disease (n=24), cervical malignancy (SCC, n=104; adenocarcinoma, n=37), and age-matched healthy controls (n=45). Immunohistochemical analysis for local YKL-40 expression was carried out on 28 adenocarcinomas. RESULTS Receiver operating characteristic curve analysis showed that YKL-40 [area under the curve (AUC)=0.882] was significantly better at discriminating adenocarcinoma from healthy control than SCC antigen, CA 125, and CA19-9. For SCC, YKL-40 (AUC=0.898) carried out similarly to SCC antigen and was better than CA 125 and CA19-9. Using a cut-off YKL-40 value of 92.2 ng/ml, sensitivity of YKL-40 in stage I adenocarcinoma (68%) was higher than that of the other three markers (11%-21%). Tumor-associated macrophages showed immunoreactivity for YKL-40 in 2 of 28 adenocarcinoma tissue samples, but adenocarcinoma cells themselves were nonimmunoreactive in all samples. Multivariate Cox regression analysis revealed that elevated pretreatment YKL-40 levels predicted unfavorable prognosis, independent of International Federation of Gynecology and Obstetrics stage and age at diagnosis. CONCLUSIONS Pretreatment serum YKL-40 level is a possible prognosticator of cervical adenocarcinoma.
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Yao Y, Seki K, Miyoshi Y, McFadden JP, Lund EJ, Carlson CW. Effect of solar wind variation on low-energy O+populations in the magnetosphere during geomagnetic storms: FAST observations. ACTA ACUST UNITED AC 2008. [DOI: 10.1029/2007ja012681] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Seki K, Bagchi B, Tachiya M. Orientational relaxation in a dispersive dynamic medium: generalization of the Kubo-Ivanov-Anderson jump-diffusion model to include fractional environmental dynamics. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 77:031505. [PMID: 18517386 DOI: 10.1103/physreve.77.031505] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Indexed: 05/26/2023]
Abstract
The Ivanov-Anderson model (and an earlier treatment by Kubo) envisages a decay of the orientational correlation by random but large amplitude molecular jumps, as opposed to infinitesimal small jumps assumed in Brownian diffusion. Recent computer simulation studies on water and viscous liquids have shown that large amplitude motions may indeed be more of a rule than exception. Existing theoretical studies on jump diffusion mostly assume an exponential (Poissonian) waiting time distribution for jumps, thereby again leading to an exponential decay. Here we extend the existing formalism of Ivanov and Anderson to include an algebraic waiting time distribution between two jumps. As a result, the first (l=1) and second (l=2) rank orientational time correlation functions show the same long time power law, but their short time decay behavior is quite different. The predicted Cole-Cole plot of dielectric relaxation reproduces various features of non-Debye behavior observed experimentally. We also developed a theory where both unrestricted small jumps and large angular jumps coexist simultaneously. The small jumps are shown to have a large effect on the long time decay, particularly in mitigating the effects of algebraic waiting time distribution, and in giving rise to an exponential-like decay, with a time constant, surprisingly, less than the time constant that arises from small amplitude decay alone.
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Seki K, Bagchi B, Tachiya M. Dynamics of Barrierless and Activated Chemical Reactions in a Dispersive Medium within the Fractional Diffusion Equation Approach. J Phys Chem B 2008; 112:6107-13. [DOI: 10.1021/jp076753q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Shien T, Akashi-Tanaka S, Shimizu C, Hojo T, Seki K, Kohno T, Ando M, Katsumata N, Fujiwara Y, Kinoshita T. Evaluation of clinicopathological features from core needle biopsy and CT imaging as predictors of response to primary systemic therapy for operable breast cancer. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.11086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
11086 Background: Primary systemic therapy (PST) is standard therapy for patients with locally advanced breast cancer and increasingly used for early-stage operable disease. Clinical and pathologic responses are important prognostic parameters and clinicopathological markers to predict response to PST are needed to individualize treatment. Methods: From 1998 to 2005, 403 primary breast cancer patients were underwent curative surgical treatment after PST (Anthlacycline and/or Taxane) at NCCH. We retrospectively evaluated the clinicopathological features (age, histological type, histological grade, ER, PgR and HER-2) and classification of tumors using CT (localized tumor type and diffused tumor type) at before PST and analyzed the correlation with clinical response and pathological complete response (pCR). The log-rank statistic was used for univariate comparisons and multivariate analysis performed using Cox hazard model. Results: Overall response and pCR rate were 87% and 18%. Breast conserving surgery was performed 37% patients. Histological grade 3 (p<0.0001), ER negative (p<0.0001), PgR negative (p<0.0001), solid-tubular type (p=0.0006), age (>50) (p=0.008) and localized tumor type (p=0.02) correlated with pCR. In multivariate analysis, Histological grade 3 (p=0.01) and localized tumor type (p=0.036) were independent predictors for pCR. ER positive, histological grade 2 or 1, invasive lobular carcinoma and diffuse tumor type associated with low chemosensitivity and low breast conserving surgery rate. Conclusions: Clinical and pathological response significantly associated with ER status and histological grade. Furthermore the classification of tumor type using CT was effective to predict of response to PST. No significant financial relationships to disclose.
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Suematsu H, Nishimura S, Murai K, Hayashi Y, Suzuki T, Nakayama T, Jiang W, Yamazaki A, Seki K, Niihara K. Pulsed wire discharge apparatus for mass production of copper nanopowders. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2007; 78:056105. [PMID: 17552867 DOI: 10.1063/1.2721419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A pulsed wire discharge (PWD) apparatus for the mass production of nanopowders has been developed. The apparatus has a continuous wire feeder, which is operated in synchronization with a discharging circuit. The apparatus is designed for operation at a maximum repetition rate of 1.4 Hz at a stored energy of 160 J. In the present study, Cu nanopowder was synthesized using the PWD apparatus and the performance of the apparatus was examined. Cu nanopowder of 2.0 g quantity was prepared in N(2) gas at 100 kPa for 90 s. The particle size distribution of the Cu nanopowder was analyzed by transmission electron microscopy and the mean surface diameter was determined to be 65 nm. The ratio of the production mass of the powder to input energy was 362 g/kW h.
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Tajima A, Seki K, Shinji H, Masuda S. Inhibition of interleukin-8 production in human endothelial cells by Staphylococcus aureus supernatant. Clin Exp Immunol 2007; 147:148-54. [PMID: 17177974 PMCID: PMC1810458 DOI: 10.1111/j.1365-2249.2006.03254.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Recent reports have shown that Staphylococcus aureus infection increases the expression of cytokines and cell adhesion molecules in endothelial cells and enhances leucocyte migration, thereby resulting in bacterial elimination. In this study, we analysed the production of the chemokine interleukin (IL)-8 in human umbilical vein endothelial cells (HUVEC) infected with several S. aureus strains by using reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay. We found that the avirulent strains (00-51 and 00-62) increased IL-8 production but the virulent strains (A17 and A151) decreased it at both the mRNA and protein levels. We considered that the inhibition of IL-8 production depended on certain inhibitory factor(s) secreted by bacteria. This was because S. aureus also abolished IL-8 expression in HUVEC treated with cytochalasin D, and the addition of culture supernatants of strains A17 and A151 decreased IL-8 production in HUVEC. This factor(s) in the bacterial culture supernatant inhibited both basal and tumour necrosis factor (TNF)-alpha-induced IL-8 production. In contrast, no inhibitory effect was observed on monocyte chemotactic protein-1 (MCP-1) production. These results indicate that S. aureus can down-regulate IL-8 release in endothelial cells through the secretion of inhibitory factor(s), and this may result in decreased neutrophil recruitment, thus interfering with the host immune response to bacterial infection.
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Kinoshita T, Shien T, Terada K, Yoshida M, Nakano E, Akashi T, Hojo T, Seki K. P69 Sentinel lymph node biopsy is feasible for breast cancer patients with clinically negative axillary lymph nodes after neoadjuvant chemotherapy. Breast 2007. [DOI: 10.1016/s0960-9776(07)70134-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Kaku K, Osada H, Seki K, Sekiya S. Insulin-like growth factor 2 (IGF2) and IGF2 receptor gene variants are associated with fetal growth. Acta Paediatr 2007; 96:363-7. [PMID: 17407457 DOI: 10.1111/j.1651-2227.2006.00120.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM Normal variation in size at birth is a result of the interaction between fetal genetic factors and the maternal uterine environment. It is, however, unclear how genetic factors contribute to fetal growth. The insulin-like growth factor (IGF) system regulates uterine, placental and fetal development, thereby partially controlling the rate of fetal growth. The aim of this study was to investigate the associations between the neonatal birth weight and the genotypes of polymorphic loci in the IGF2 and IGF2 receptor (IGF2R) genes. METHODS We determined the genotypes of two polymorphic loci in the IGF2 gene and four loci in the IGF2R gene in 884 pairs of normal Japanese mothers and their neonates, and compared the genotypes with the birth weight converted into standard deviation scores (SDSs) according to sex, parity and gestational weeks at delivery. RESULTS There was a significant difference in birth weight SDSs among the three neonatal +3123/ApaI genotypes of the IGF2 gene; AA, AG and GG. There was also a significant difference in birth weight among the three neonatal c.901C > G genotypes of the IGF2R gene; CC, CG and GG. CONCLUSION These findings indicate that both IGF2 and IGF2R gene variants are associated with fetal growth.
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Seki K, Komura S, Imai M. Concentration fluctuations in binary fluid membranes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2007; 19:072101. [PMID: 22251577 DOI: 10.1088/0953-8984/19/7/072101] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the dynamics of critical fluctuations in binary fluid membranes using a two-dimensional hydrodynamic model with momentum decay to the surrounding water. In particular, the decay rate of concentration fluctuations is obtained analytically. In the limit of small wavenumber q with respect to the correlation length, the decay rate is proportional to q², as usual. In the large-q limit, however, the effective diffusion coefficient increases only logarithmically with q.
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Yamaguchi N, Seki K, Komamura M, Kurishima K. Long-term mobility of fallout 90Sr in ploughed soil, and 90Sr uptake by wheat grain. THE SCIENCE OF THE TOTAL ENVIRONMENT 2007; 372:595-604. [PMID: 17123589 DOI: 10.1016/j.scitotenv.2006.10.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2006] [Revised: 10/05/2006] [Accepted: 10/10/2006] [Indexed: 05/12/2023]
Abstract
In this study, we evaluated the mobility of 90Sr in ploughed upland soil, which affects the residual amount in the soil and plant uptake on the basis of long-term monitoring data. Paired samples of soil and wheat grain were taken annually from 1961 to 1995 from 8 agricultural fields in Japan, and the concentrations of exchangeable 90Sr in soil and total 90Sr in wheat grain were determined. The concentration of exchangeable 90Sr in ploughed soil decreased exponentially with time. The environmental factor responsible for the decrease of exchangeable 90Sr in the ploughed layer, lambda(e), was determined from the monitoring data of exchangeable 90Sr in the ploughed soil and the amount of fallout-derived deposition. The lambda(e) was larger from 1970 to 1980 than it was from 1980 to 1995, suggesting that an easily removable fraction of 90Sr in soil was preferentially lost from ploughed soil. Among various soil properties that we investigated, the main factor controlling the long-term mobility of 90Sr from ploughed upland soil and 90Sr uptake by wheat grain was the cation-exchange capacity (CEC) of soil. Our experimental results indicate that the entrapment of 90Sr on a cation-exchange site retards the downward migration and wheat uptake of 90Sr from ploughed soil. The empirical parameters that we obtained based on the long-term observation of a wheat-cultivated upland field in Japan could be used as reference data in order to roughly estimate the mobility of 90Sr in ploughed soil and soil-borne 90Sr transfer to wheat grain in the humid Japanese climate.
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Seki K, Haraguchi K, Kishimoto M, Kobayashi S, Kainuma K. Production of a Novel Inulin Fructotransferase (DFAI producing) byArthrobacter globiformisS14-3. STARCH-STARKE 2006. [DOI: 10.1002/star.19880401110] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sugiyama K, Yoshimura D, Ito E, Miyazaki T, Hamatani Y, Kawamoto I, Ouchi Y, Seki K, Ishii H. Uv Photoemission Study of 8-Hydroxyquinoline Aluminum (ALQ3) / Metal Interfaces. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259608042292] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Tsuboi K, Kajikawa K, Hamada N, Fujita K, Hara M, Sasabe H, Knoll W, Seki K, Ouchi Y. Reflection Spectroscopy of Merocyanine Self-assembled Monolayer on a Gold Substrate. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259808030222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Li C, Matsunaga T, Seki K, Yoshimoto M, Furumoto K, Fukunaga K, Nakao K. Effects of Sparging Gas Properties and Substrate Size on Enzymatic Hydrolysis of Waste Paper in an Ultrasonic External Loop Airlift. Chem Eng Technol 2006. [DOI: 10.1002/ceat.200600145] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Yamauchi K, Samanya M, Seki K, Ijiri N, Thongwittaya N. Influence of Dietary Sesame Meal Level on Histological Alterations of the Intestinal Mucosa and Growth Performance of Chickens. J APPL POULTRY RES 2006. [DOI: 10.1093/japr/15.2.266] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kera S, Tanaka S, Yamane H, Yoshimura D, Okudaira K, Seki K, Ueno N. Quantitative analysis of photoelectron angular distribution of single-domain organic monolayer film: NTCDA on GeS(001). Chem Phys 2006. [DOI: 10.1016/j.chemphys.2005.10.023] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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