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Tsurunaga Y.,The University of Shimane | Takahashi T.,The University of Shimane | Katsube T.,Shimane Institute for Industrial Technology | Kudo A.,Panasonic | And 3 more authors.
Food Chemistry | Year: 2013

The effects of various light compositions on the levels of anthocyanin, rutin and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity in buckwheat (Fagopyrum esculentum Moench) sprouts were evaluated. Dark-grown 6-day-old buckwheat sprouts were irradiated with different sources of visible and ultraviolet (UV) light. Particularly, we examined the effect of UV-B at wavelengths of 260-320 nm, 280-320 nm, and 300-320 nm on the production of flavonoid compounds, using multiple fluorescent lights and cylinders that filter out certain portions of the UV-B. The results showed that irradiation with UV-B > 300 nm increased the levels of anthocyanin and rutin, as well as the DPPH radical scavenging activity. When sprouts were irradiated with UV-B light at wavelengths of 260-300 nm, yellowing or withering occurred within 24 h of irradiation, indicating that wavelengths in this range are detrimental to the growth of buckwheat sprouts. © 2013 Elsevier Ltd. All rights reserved. Source

Imade S.,The University of Shimane | Uchio Y.,The University of Shimane | Ozoe N.,Shimane Institute for Industrial Technology
Journal of Orthopaedic Science | Year: 2012

Background: Bone pegs are one of the best devices to treat an intra-articular lesion with fragments because of the pegs' biological characteristics, but the initial strength of the fragment fixation in these cases is unknown. In addition, the relationship between the geometry of bone pegs and the strength of fragment fixation remains unknown. We hypothesized that a microscopically fine bone peg made by a precision machine can provide a higher level of strength than that of a macroscopically fine bone peg made by hand both initially and postoperatively. Methods: The machine-made bone pegs were made from cortical bone of cattle by a precision machine, and the handmade bone pegs were made by hand using the same material. An osteochondral lesion model was made, and two pegs of the same type were inserted to fix each test fragment. The shearing and pull-out strength of the fragment were investigated in both types of peg. Next, both types of peg were inserted into a hole made in the distal femur of a rabbit, and 10 days later, mechanical tests were performed. Results: The machine-made bone pegs were initially twice as strong as the handmade bone pegs, and they were 1.4 times as strong as the handmade bone pegs at 10 days after surgery. Conclusion: We recommend that bone pegs be made by machining rather than by hand. The machine-made bone pegs have the potential to ensure early postoperative rehabilitation. © The Japanese Orthopaedic Association 2012. Source

Kadowaki M.,The University of Shimane | Yano A.,The University of Shimane | Ishizu F.,Shimane Agricultural Technology Center | Tanaka T.,Yamaguchi University | Noda S.,Shimane Institute for Industrial Technology
Biosystems Engineering | Year: 2012

The use of renewable energy for greenhouse environment control to replace or reduce the consumption of fuel and power-line electricity is an important objective for sustainable greenhouse crop production. This study was undertaken to apply a solar photovoltaic (PV) array to supply electricity for greenhouse environment control. The PV array was mounted inside the south roof of an east-west oriented single-span greenhouse, in which Welsh onion (Allium fistulosum L.) was cultivated hydroponically. Effects of PV-array shading on the Welsh onion growth were assessed. Two PV-array formations were tested: straight-line and checkerboard. For each arrangement, the PV array covered 12.9% of the greenhouse roof area. Beside the PV greenhouse, a control greenhouse was built with identical dimensions and orientation to those of the PV greenhouse. Welsh onion was cultivated also in the control greenhouse. The straight-line arranged PV-array (PV s array) cast shadows on a specific area of the cultivated plants continuously during the growth period. The fresh weight (FW) and dry-matter weight (DW) of Welsh onion cultivated under the PV s array shadow were significantly less than those of Welsh onion cultivated in the control greenhouse. The checkerboard PV-array (PV c array) cast shadows in the PV c greenhouse intermittently during growth. Consequently, the inhibitory effects of the PV-array shading on the FW and DW accumulations of Welsh onion were diminished. The electrical energy generated by the PV c array was comparable to that of the PV s array, which is another advantage of the PV c array. © 2012 IAgrE. Source

Feng Y.,Tianjin University | Qin M.,Tianjin University | Guo H.,Tianjin University | Yoshino K.,Shimane Institute for Industrial Technology | Feng W.,Tianjin University
ACS Applied Materials and Interfaces | Year: 2013

Optically actuated shape recovery materials receive much interest because of their great ability to control the creation of mechanical motion remotely and precisely. An infrared (IR) triggered actuator based on shape recovery was fabricated using polyurethane (TPU) incorporated by sulfonated reduced graphene oxide (SRGO)/sulfonated carbon nanotube (SCNT) hybrid nanofillers. Interconnected SRGO/SCNT hybrid nanofillers at a low weight loading of 1% dispersed in TPU showed good IR absorption and improved the crystallization of soft segments for a large shape deformation. The output force, energy density and recovery time of IR-triggered actuators were dependent on weight ratios of SRGO to SCNT (SRGO:SCNT). TPU nanocomposites filled by a hybrid nanofiller with SRGO:SCNT of 3:1 showed the maximum IR-actuated stress recovery of lifting a 107.6 g weight up 4.7 cm in 18 s. The stress recovery delivered a high energy density of 0.63 J/g and shape recovery force up to 1.2 MPa due to high thermal conductivity (1.473 W/mK) and Young's modulus of 23.4 MPa. Results indicate that a trade-off between the stiffness and efficient heat transfer controlled by synergistic effect between SRGO and SCNT is critical for high mechanical power output of IR-triggered actuators. IR-actuated shape recovery of SRGO/SCNT/TPU nanocomposites combining high energy density and output forces can be further developed for advanced optomechanical systems. © 2013 American Chemical Society. Source

Mori R.,The University of Shimane | Nakai T.,The University of Shimane | Enomoto K.,The University of Shimane | Uchio Y.,The University of Shimane | And 2 more authors.
Clinical Orthopaedics and Related Research | Year: 2011

Background: Major disadvantages of antibiotic bone cements include limited drug release and reduced strength resulting from the addition of high doses of antibiotics. Bacterial cellulose, a three-dimensional hydrophilic mesh, may retain antibiotics and release them gradually. We hypothesized that the addition of cellulose to antibiotic bone cement would improve mechanical strength and antibiotic release. Questions/purposes: We therefore examined the mechanical strength and antibiotic release of cellulose antibiotic cement. Methods: A high dose of antibiotics (5 g per 40 g cement powder) was incorporated into bacterial cellulose and then mixed with bone cement. We compared the compression strength, fracture toughness, fatigue life, and elution kinetics of this formulation with those of plain cement and a traditional antibiotic cement. Results: The average values for compression strength, fracture toughness, and fatigue life of the cellulose antibiotic cement were 97%, 97%, and 78% of the values obtained for plain cement, respectively. The corresponding values for the traditional antibiotic cement were 79%, 82%, and 17%, respectively. The cumulative elution over 35 days was 129% greater from the cellulose antibiotic cement than from the traditional antibiotic cement. Conclusions: With a high dose of antibiotics, incorporating cellulose into the bone cement prevented compression and fracture fragility, improved fatigue life, and increased antibiotic elution. Clinical Relevance: Antibiotic cements containing cellulose may have applications in clinical situations that require high levels of antibiotic release and preservation of the mechanical properties of the cement. © 2010 The Association of Bone and Joint Surgeons®. Source

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