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排序方式: 共有199条查询结果,搜索用时 15 毫秒
101.
Masahito Kushida Yoshiaki Imaizumi Ayako Sakayori Megumi Totsuka 《IEEJ Transactions on Electrical and Electronic Engineering》2008,3(2):244-248
The activation energies of in‐plane highly electrically conductive 2‐dodecyl‐7,7,8,8‐tetracyanoquinodimethane (C12 TCNQ)/arachidic acid (C20) hetero‐LB films and C12TCNQ homo‐LB films were determined by thermally stimulated current (TSC) measurement. The TSC curves for the upper Al electrode/C12TCNQ/C20/lower Al electrode were nearly of the same shape as those for the upper Al electrode/C12TCNQ/lower Al electrode. The activation energies of the upper Al electrode/C12TCNQ/C20/lower Al electrode and upper Al electrode/C12TCNQ/lower Al electrode were 0.9–1.3 eV at 55–80°C and 1.6–1.8 eV at 105–120°C, respectively. The TSC curves for the upper Al electrode/C12TCNQ/C20/lower Al electrode and upper Al electrode/C12TCNQ/lower Al electrode had two peaks at 55–80°C owing to the depolarization of the electric dipole and two peaks at 105–120°C owing to the movement of space charges in the C12TCNQ molecule. Copyright © 2008 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
102.
Isobe K Kato A Sasaki Y Kataoka M Ogawa J Iwasaki A Hasegawa J Shimizu S 《Journal of Bioscience and Bioengineering》2008,105(6):666-670
The relations between oxidase activity on aldehyde alcohols and superoxide dismutase (SOD) were investigated, since the amino terminal amino acid sequence of alcohol oxidase (AOD) from Paenibacillus sp. AIU 311, which was specific to aldehyde alcohols, exhibited high similarity to those of SODs containing manganese (Mn(2+)-SOD). Paenibacillus AOD had high SOD activity. The SODs containing manganese, iron, or copper and zinc also exhibited oxidase activities on aldehyde alcohols, and the relative values of oxidase activities on aldehyde alcohols to SOD activity of Mn(2+)-SOD were closer to those of Paenibacillus AOD compared with those of the other SODs. Thus, SODs had AOD activity on aldehyde alcohols as another enzyme activity, and the Paenibacillus AOD and Mn(2+)-SOD were classified into a similar group. 相似文献
103.
Hironori Yamazoe Ayako Oyane Takeshi Nashima Atsuo Ito 《Materials science & engineering. C, Materials for biological applications》2010,30(6):812-816
Surface-induced thrombosis is a major complication associated with blood-contacting biomaterials. Cross-linked albumin films possessing native albumin characteristics such as resistance to cell adhesion and drug binding ability are available for improving the blood compatibility of biomaterial surfaces. In the present study, we aimed to evaluate the blood compatibility of cross-linked albumin films. Platelet adhesion analysis showed that albumin film coated substrates exhibited very low platelet adhesion, and platelet adhesion was further suppressed by loading the antiplatelet drug, cilostazol, into the film. Monitoring the coagulation process of whole blood using a coaxial-cylinder rotational viscometer showed that the initial time of coagulation in albumin film coated cylinders was delayed compared with that in uncoated cylinders, suggesting that activation of the intrinsic coagulation cascade was reduced on the albumin film coated surface. Thus, surface coating with cross-linked albumin films is a promising approach to conferring biomaterials with antithrombogenic surfaces due to the resistance to platelet adhesion and the antiplatelet drug-releasing capability afforded by the films. 相似文献
104.
Sakai A Kawakami K Takatori K Saito Y 《Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan》2004,45(4):201-206
A survey concerning foods for which complaints of fungal contamination had been made was carried out by distributing and retrieving a questionnaire. The subject of the survey was foods that were examined for fungi by institutes and laboratories belonging to regulatory agencies following consumers' complaints or upon request from food companies to solve problems. We analyzed 1,096 cases recovered from 40 organizations located in 30 prefectures. Most foods with fungal contamination were "cake and snacks", "beverages" and "bakery products", and processed and cooked foods and beverages accounted for more than 90% of the complaints. The numbers of cases were greater in the summer and less in the winter. The major fungal genus detected in the suspect foods were Penicillium, Aspergillus and Cladosporium. Aspergillus niger was the dominant species contaminating bakery products. Complainers reported physical symptoms including diarrhea, stomach ache, nausea and vomiting in 18% of the cases in which they had eaten or drunk fungus-contaminated foods or beverages. There was no clear difference in the fungi detected between foods and beverages that caused symptoms and those that did not. The proportion of beverages was greater in the foods that induced symptoms than in the whole of the foods for which complaints were made. This was presumed to be because consumers drank fungus-contaminated beverages more often than they ate fungus-contaminated foods. 相似文献
105.
106.
A biodegradable polymer coated with a bonelike apatite layer on its surface would be useful as a scaffold for bone tissue
regeneration. In this study, poly(l-lactic acid) (PLLA) was treated with oxygen plasma to produce oxygen-containing functional groups on its surface. The plasma-treated
specimen was then alternately dipped in aqueous CaCl2 and K2HPO4·3H2O solutions three times, to deposit apatite precursors onto the surface. The surface-modified specimen then successfully formed
a dense and uniform bonelike surface apatite layer after immersion for 24 h in a simulated body fluid with ion concentrations
approximately equal to those of human blood plasma. The adhesive strength between the apatite layer and the specimen surface
increased as the power density of the oxygen plasma used increased. The maximum adhesive strength of the apatite layer to
the specimen was significantly higher than that to the commercially available artificial bone, HAPEXTM. The resultant bonelike apatite–PLLA composite would be useful as a scaffold for bone tissue regeneration. 相似文献
107.
Mutsuzaki H Ito A Sakane M Sogo Y Oyane A Ebihara Y Ichinose N Ochiai N 《Journal of materials science. Materials in medicine》2007,18(9):1799-1808
A novel technique was developed to coat a calcium phosphate (CaP) layer on titanium screws with a titanium oxide surface layer,
using infusion fluids officially approved for clinical use. A calcium-containing solution, a phosphate-containing solution,
and a sodium bicarbonate solution prepared from the infusion fluids were mixed at a Ca/P molar ratio of 2.0. Each screw was
immersed in 10 mL of the resulting mixture at 37 °C for 2 days. A low-crystalline apatite layer (Ca/P molar ratio = 1.681 ± 0.038)
was formed on the screws. The layer consisted of a few 100 nm diameter particles fixed on the screw surface. In animal experiments,
the screws were percutaneously implanted in both proximal tibial metaphyses of rabbits. The insertion torque was not significantly
different between the CaP-coated screws (0.132 ± 0.002 Nm, n = 10) and uncoated screws (0.140 ± 0.002 Nm, n = 10) (p = 0.5785). After the insertion torque test, the apatite layer remained on the surface of the screws, which means that the
apatite layer survived the friction of screw insertion. The extraction torque of the screws in the CaP-coated group (0.239 ± 0.066 Nm,
n = 19) was significantly higher (by 29.9%) than that in the uncoated group (0.184 ± 0.062 Nm, n = 18) 4 weeks after the operations (p = 0.0132). Histologically, a larger amount of new bone formation was observed around the CaP-coated screws than that around
the uncoated screws. Even after the removal of the screw, the CaP layer remained on the screw at the site where soft tissues
were attached. The coating technique with the use of the infusion fluids is an effective method of improving bone-screw interface
strength. 相似文献
108.
Yoko Okahisa Ayako Yoshida Satoshi Miyaguchi Hiroyuki Yano 《Composites Science and Technology》2009,69(11-12):1958-1961
Nine types of matrix resin were reinforced with cellulose nanofibers extracted from wood powder, and we measured regular light transmittances, tensile moduli, and coefficient of thermal expansion (CTE) values. To evaluate the potential application as display substrates, organic light-emitting diode (OLED) materials were manufactured on the wood–cellulose nanocomposites. As a result, we succeeded in depositing an OLED on flexible, low-CTE and optically transparent wood–cellulose nanocomposites. At the same fiber content, the nanocomposites using lower Young’s modulus matrix resin exhibited lower CTE values than using higher Young’s modulus matrix resins. It led to the development of nanocomposites with a very low CTE while having high flexibility and ductile properties. Furthermore, since wood–cellulose is one of the most abundant biomass resources, production of these nanocomposites can be undertaken at a commercial scale. 相似文献
109.
Eri Kokubo Hirofumi Sonoki Kenta Aizawa Hiroki Takagi Masayasu Takada Ayako Ito Yuki Nakazato Yasuhiro Takeda Kazuhiro Miyaji 《Journal of Applied Glycoscience》2022,69(3):57
Slowly digestible carbohydrates are needed for nutritional support in diabetic patients with malnutrition. They are a good source of energy and have the advantage that their consumption produces a low postprandial peak in blood glucose levels because they are slowly and completely digested in the small intestine. A high-amount isomaltomegalosaccharide containing carbohydrate (H-IMS), made from starch by dextrin dextranase, is a mixture of glucose polymers which has a continuous linear structure of α-1,6-glucosidic bonds and a small number of α-1,4-glucosidic bonds at the reducing ends. It has a broad degree of polymerization (DP) distribution with glucans of DP 10-30 as the major component. In our previous study, H-IMS has been shown to exhibit slow digestibility in vitro and not to raise postprandial blood glucose to such levels as that raised by dextrin in vivo. This marks it out as a potentially useful slowly digestible carbohydrate, and this study aimed to evaluate its in vivo digestibility. The amount of breath hydrogen emitted following oral administration of H-IMS was measured to determine whether any indigestible fraction passed through to and was fermented in the large intestine. Total carbohydrate in the feces was also measured. H-IMS, like glucose and dextrin, did not result in breath hydrogen excretion. Carbohydrate excretion with dietary H-IMS was no different from that of glucose or water. These results show that the H-IMS is completely digested and absorbed in the small intestine, indicating its potential as a slowly digestible carbohydrate in the diet of diabetic patients. 相似文献
110.
Hiroyuki Yamamoto Chikako Horita Yukiko Senoo Ayako Nishida Kousaku Ohkawa 《应用聚合物科学杂志》2001,79(3):437-446
Different characteristic surface structures such as capsules, regularly spaced droplets, and fibers are formed by electrostatic interaction between poly‐L ‐lysine (PLL) and gellan gum via polyion complex (PIC) formation. Spherical droplet PIC capsules of varying diameters form in solutions. Some dyes adsorb on the surface of the capsules, and other dyes penetrate into the capsules. The strong PIC fiber can be spinnable by gravity and by wet spinning in ethanol. This fiber possesses a counterion pairing structure and exhibits the nervation/veining pattern and hollow yarn. The tensile strength of the fiber is 27.8 kg/mm2 [1.40 g/denier (d)] and the knotting strength is 9.98 kg/mm2 (1.13 g/d). By using an organic crosslinking agent, epichlorohydrin, the tensile strength can be increased to 38.5 kg/mm2 (2.46 g/d) and the knotting strength can be increased to 12.2 kg/mm2 (1.99 g/d). The PIC fiber can be dyed by five different dyeing procedures such as direct and vat dyeings. The PLL PIC fiber is water insoluble and has potential as a new synthetic polypeptide fiber technology. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 437–446, 2001 相似文献