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Yamamoto C.,Tottori Institute of Industrial Technology | Neoh T.L.,Kagawa University | Honbou H.,Tottori University | Furuta T.,Tottori University | And 2 more authors.
Drying Technology | Year: 2012

The polymer-coated inclusion complex powder formation of D-limonene and β-cyclodextrin obtained by spray drying was investigated with respect to the effects of various types of polymer coating agents on the powder particle size and morphology. The addition of the polymer coating agent affected the average particle size, morphology, and internal structures of the spray-dried powders. The average particle diameter of the uncoated spray-dried powders was approximately 5 μm. The powder particle size increased upon the addition of a polymer coating reagent. With the addition of 9 wt% of the polymer coating agent, an average diameter of approximately 80 μm was obtained for the spray-dried powder particles. However, further addition showed a negligible effect on the particle size. Inclusion complex crystals were observed on the surface and inside of the powder particles. © 2012 Copyright Taylor and Francis Group, LLC.


Kohyama K.,Japan National Agriculture and Food Research Organization | Kato-Nagata A.,Japan National Agriculture and Food Research Organization | Kato-Nagata A.,Tottori Institute of Industrial Technology | Shimada H.,Japan National Agriculture and Food Research Organization | And 2 more authors.
Journal of Texture Studies | Year: 2013

To determine an effective method to evaluate the texture of cucumbers, human-bite measurement using a multiple-point sheet sensor and instrumental tests using wedge probes with various angles and a cylindrical probe were conducted. To detect small differences in texture, cross-sectional slices taken from the middle part of a cucumber fruit were served at 4 or 22C. The 60°-wedge probe that could completely divide samples like human incisors performed best compared with sharper wedges or cylindrical probe that partly broke the tissue. The human-bite force for cucumber slices of 4C was significantly lower than that of 22C. Breaking force and energy with the wedges of 60 and 30° in the compression test and those for flesh puncture test demonstrated a similar temperature effect. A faster compression speed close to the human-bite speed (20mm/s) was necessary to detect the significant temperature effects. Practical Applications: The texture of cucumber was analyzed more precisely using a wedge probe with an angle of 60° inserted into sectional slices of the samples similar to the action of human front teeth that completely cut off the section. A cylindrical probe could insert only part of the cucumber tissues and a blade or a sharper wedge probe partially broke the slices to the depth which the probe reached. Faster test speed (>10mm/s) close to the average speed of human bite is preferred to detect temperature effects on fracture force. If there are some differences in breaking properties of cucumbers, the proposed conditions of compression test with a 60° wedge at 20mm/s will detect delicate differences as those due to serving temperature were small. © 2012 Wiley Periodicals, Inc..


Sonobe K.,Tottori University | Hattori T.,University of Tokyo | An P.,Tottori University | Tsuji W.,Tottori University | And 5 more authors.
Journal of Plant Nutrition | Year: 2011

To analyze how silicon (Si) fertilizer improves plant growth under water stress, we investigated the growth and root responses of sorghum seedlings to Si application. Seedlings were grown hydroponically at two Si levels (0 and 1.78 mM) and under two water stress conditions simulated with polyethylene glycol. The reduction in dry weight due to stress was alleviated by Si application, accompanied by an increase in root water uptake. Silicon application decreased the osmotic potential of the roots without affecting their water content, showing that osmotic adjustment occurred to increase water uptake. An assessment of root solutes suggested that soluble sugar and amino acids (alanine and glutamic acid) were osmolytes responsible for this adjustment. Root anatomical traits related to water transport were not affected by the Si application. These results improved our understanding of the physiological mechanisms that underlie the Si-induced increases in sorghum growth and water uptake under water stress. © Taylor & Francis Group, LLC.


Wakuda T.,Tottori University | Azuma K.,Tottori University | Saimoto H.,Tottori University | Ifuku S.,Tottori University | And 8 more authors.
Journal of Functional Foods | Year: 2013

The effects of pear vinegar (PV), which was specially brewed for enhanced galacturonic acid content, on the DSS-induced ulcerative colitis (UC) mouse model were evaluated. PV improved clinical symptoms, colon inflammation, and histological tissue injury in the DSS-induced acute UC mouse model. Moreover, PV suppressed inflammation due to acute UC by suppressing the myeloperoxidase (MPO)-mediated activation of inflammatory cells such as leukocytes and decreasing the serum concentration of IL-6. Our results demonstrated the protective action of PV in the DSS-induced acute UC mouse model. On the other hand, commercial apple vinegar did not show a protective effect in the DSS-induced acute UC mouse model. Our findings indicate that PV may act as a new functional food for inflammatory bowel disease patients. © 2012 Elsevier Ltd.


Nakasone N.,Tottori University | Nakamura Y.S.,Tottori Institute of Industrial Technology | Higaki K.,Tottori University | Oumi N.,Tottori University | And 2 more authors.
Journal of Biological Chemistry | Year: 2014

Most cases with Niemann-Pick disease type C carry mutations in NPC1. Some of the mutations, including the most frequent I1061T, give rise to unstable proteins selected for endoplasmic reticulum-associated degradation. The purpose of the current study was to shed mechanistic insights into the degradation process. A proteasome inhibitor MG132 prolonged the life span of the wild-type NPC1 expressed in COS cells. The expressed protein associated with multiple chaperones including heat shock protein 90 (Hsp90), Hsp70, heat shock cognate protein 70 (Hsc70), and calnexin. Accordingly, expression of an E3 ligase CHIP (carboxyl terminus of Hsp70-interacting protein) enhanced MG132-induced accumulation of ubiquitylated NPC1. Co-expression and RNAi knockdown experiments in HEK cells indicated that Hsp70/Hsp90 stabilized NPC1, whereas Hsc70 destabilized it. In human fibroblasts carrying the I1061T mutation, adenovirus-mediated expression of Hsp70 or treatment with an HSP-inducer geranylgeranylacetone (GGA) increased the level of the mutant protein. In GGA-treated cells, the rescued protein was localized in the late endosome and ameliorated cholesterol accumulation. MALDI-TOF mass spectrometry revealed three lysine residues at amino acids 318, 792, and 1180 as potential ubiquitin-conjugation sites. Substitutions of the three residues with alanine yielded a mutant protein with a steady-state level more than three times higher than that of the wild-type. Introduction of the same substitutions to the I1061T mutant resulted in an increase in its protein level and functional restoration. These findings indicated the role of HSPs in quality control of NPC1 and revealed the role of three lysine residues as ubiquitin-conjugation sites. © 2014 by The American Society for Biochemistry and Molecular Biology, Inc.


Kyotani M.,The Interdisciplinary Center | Matsushita S.,Kyoto University | Kimura S.-I.,Tottori Institute of Industrial Technology | Akagi K.,Kyoto University
Journal of Analytical and Applied Pyrolysis | Year: 2012

A novel carbon paper has been prepared by pyrolysis from traditional Japanese paper called washi in Japan, which is mainly composed of cellulose microfibers. The washi was iodine-treated before pyrolysis. The effect of iodine-treatment on pyrolysis of the washi was investigated using thermogravimetric analysis. The structural and electrical properties of the carbon papers were also investigated using Raman scattering, X-ray diffraction, electron microscopy, and resistivity measurements. The iodine-treatment prevents cellulose from thermally decomposing and is effective in increasing the carbon yield and retaining its fibrillar structure. Porous carbon papers consisting of many micro and nanofibrils were prepared by the pyrolysis of the iodine-treated washi at 800 °C. Those prepared at 800°C and then heat-treated at higher temperatures than 1800°C show electrical conductivities of 3 S cm -1 and 24-27 S cm -1. The degree of crystallinity and the electrical conductivity of the papers are improved by the heat treatment at higher temperatures. © 2012 Elsevier B.V. All rights reserved.


PubMed | Tottori Institute of Industrial Technology and Tottori University
Type: Journal Article | Journal: Journal of robotic surgery | Year: 2015

Transoral robotic surgery, performed with the da Vinci surgical system (da Vinci), is a surgical approach for benign and malignant lesions of the oral cavity and laryngopharynx. It provides several unique advantages, which include a 3-dimensional magnified view and ability to see and work around curves or angles. However, the current da Vinci surgical system does not provide haptic feedback. This is problematic because the potential risks specific to the transoral use of the da Vinci include tooth injury, mucosal laceration, ocular injury and mandibular fracture. To assess the potential for intraoperative injuries, we measured the load of the endoscope and the instrument of the da Vinci Si surgical system. We pressed the endoscope and instrument of the da Vinci Si against Load cell six times each and measured the dynamic load and the time-to-maximum load. We also struck the da Vinci Si endoscope and instrument against the Load cell six times each and measured the impact load. The maximum dynamic load was 7.271.31kg for the endoscope and 1.900.72 for the instrument. The corresponding time-to-maximum loads were 1.720.22 and 1.290.34s, but the impact loads were significantly lower than the dynamic load. It remains possible that a major load is exerted on adjacent structures by continuous contact with the endoscope and instrument of da Vinci Si. However, there is a minor delay in reaching the maximum load. Careful monitoring by an on-site assistant may, therefore, help prevent contiguous injury.


PubMed | Tottori Institute of Industrial Technology and Tottori University
Type: Journal Article | Journal: Journal of robotic surgery | Year: 2015

Transoral robotic surgery (TORS), performed with the da Vinci surgical system (da Vinci), has been classified as a surgical approach for benign and malignant lesions of the oral cavity and laryngopharynx. It provides several unique advantages, which include a three-dimensional magnified view, ability to see and work around curves or angles, and the availability of two or three robotic arms. At present, however, the da Vinci surgical system does not provide haptic feedback. The potential risks specific to the transoral use of the da Vinci include tooth injury, mucosal laceration, ocular injury, and mandibular fracture. To prevent such intra-operative tooth injuries, we created a mouthpiece made of polyethylene terephthalate glycol (PETG) individually shaped for the patients teeth. We compared the safety and efficacy of the PETG mouthpiece with those of a conventional mouthpiece made of ethylene-vinyl acetate (EVA). To determine the difference in tooth injury resulting from the two types of mouthpiece, we constructed an experimental system to measure load and strain. We measured the dynamic load and the strain from the rod to the tooth using the PETG and EVA mouthpiece. The rod was pressed against the tooth model outfitted with two types of mouthpiece and the dynamic load was measured with a load cell and the strain with a strain gage. The maximum dynamic load was 1.290.03kgf for the PETG mouthpiece and 2.240.05kgf for the EVA mouthpiece. The load against the tooth was thus less for the EVA mouthpiece. The strain was -166.843.94 and 48.247.77, respectively, while the load direction was parallel to that of the tooth axis for the PETG mouthpiece and perpendicular to the tooth axis for the EVA mouthpiece. The PETG mouthpiece reduced the tooth load compared with the EVA mouthpiece and the load direction was in parallel to the tooth axis. The PETG mouthpiece thus enhances tooth safety for TORS.


PubMed | Marine Products Kimuraya Co., Koyo Chemical Co., Tottori Institute of Industrial Technology, Tottori University and Scientific Crime Laboratory
Type: | Journal: Carbohydrate research | Year: 2014

Fucoidan and chondroitin sulfate, which are well known sulfated polysaccharides, were depolymerized under hydrothermal conditions (120-180C, 5-60min) as a method for the preparation of sulfated polysaccharides with controlled molecular weights. Fucoidan was easily depolymerized, and the change of the molecular weight values depended on the reaction temperature and time. The degree of sulfation and IR spectra of the depolymerized fucoidan did not change compared with those of untreated fucoidan at reaction temperatures below 140C. However, fucoidan was partially degraded during depolymerization above 160C. Nearly the same depolymerization was observed for chondroitin sulfate. These results indicate that hydrothermal treatment is applicable for the depolymerization of sulfated polysaccharides, and that low molecular weight products without desulfation and deformation of the initial glycan structures can be obtained under mild hydrothermal conditions.


PubMed | Tottori Institute of Industrial Technology
Type: Journal Article | Journal: Journal of nanoscience and nanotechnology | Year: 2012

Mono-layers of aggregated Poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) molecules were obtained by using solutions of P3HT, PCBM and P3HT-PCBM mixture without stabilizers such as stearates in chloroform at an air-water interface. 1 to 10 cycle-lifted LB films of P3HT and PCBM were successfully transferred to cleaned bare indium-tin-oxide coated glass substrate by vertical lifting method excluding the first 1 to 2 cycle layer. The dependence of P3HT and PCBM film thickness on the transfer cycles has been explained by the molecular sizes, where four edge-on P3HT molecular and six PCBM molecular stacking which result in thickness was taken into account. Work functions of deposited LB-layers were consistent with those of the ordinary casted films. P3HT and PCBM LB-layers showed optical activity in both infra-red (IR) and visible absorption regions of the spectrum. P-polarized IR absorption owing to C=C and C=O stretching vibrations observed in LB-layered films clearly indicate the enhancement of the orientation of these bonds perpendicular to the substrate surface in contrast to the spin-coated one. Visible optical absorption intensity was increased well in proportion with the lift cycle-numbers of both P3HT and PCBM LB films. The photovoltaic characteristics have been observed in the devices fabricated with P3HT (5 cycles-layer)/PCBM (5 cycles-layer) LB hetero structure as an active layer of the solar cells. The surface pressure of LB compression for the mixture of P3HT and PCBM, that is, bulk hetero mixtures, has also been well built up to 30 mN/m.

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