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91.
Shin-ichi Miyashita Kazumi Inagaki Shigehiro Naito Kumiko Shindoh Tomohiro Narukawa Yanbei Zhu Takayoshi Kuroiwa Akiharu Hioki Toshiyuki Fujimoto Koichi Chiba 《Analytical and bioanalytical chemistry》2013,405(25):8347-8362
To support skill upgrading in analysis of inorganic constituents of environmental and food samples, the National Metrology Institute of Japan (NMIJ) and the National Food Research Institute (NFRI) have organized a proficiency test (PT) of determination of Mn, Fe, Cu, Zn, As, and Cd in brown-rice flour based on the international standard (ISO/IEC 17043:2010). One hundred and thirty-three sets of reports were assessed by use of the E n -number and z-score approaches in accordance with ISO/IEC 17043 and the international harmonized protocol for PT. The PT results and analytical procedures, reported in detail, were reviewed, and possible technical reasons for questionable or unsatisfactory results are discussed.
Distribution of reported values for cadmium in the test material according to the measurement methods used. The mean values reported with standard deviations (error bars) are given in the order of lower to higher values. Solid lines indicate the expanded uncertainty (coverage factor k = 2) of assigned value. 相似文献
92.
93.
Akira Hasegawa Yuichi Hioki Makoto Kiso Hiroyuki Okumura Ichiro Azuma 《Journal of carbohydrate chemistry》2013,32(3):317-323
Abstract In the course of an investigation2 on the relationship between the immunoadjuvant activity and the structure of the carbohydrate moiety in N-acetylmuramoyl-L-alanyl-D-isoglutamine (MDP), which is the minimal, immunoadjuvant-active component of bacterial cell-wall peptidoglycan, we demonstrated that not only is restricted configuration of the sugar moiety important for the activity2 but also that chemical modifications3–5 of the functional groups in the carbohydrate moiety produce various, important effects on the manifestation of activity. It has been shown that lipophilic derivatives6–8 of MDP bearing the lipid moiety at C-6 of the sugar skeleton, or at the end of the peptide chain, have strong antitumor and anti-infection activities that are not for MDP itself. In addition, we have also observed that introduction3b,9,10 of lipophilic character at C-2 in muramoyl-L-alanyl-D-isoglutamine, or at C-6 in N-acetyl-6-amino-6-deoxy-muramoyl-L-alanyl-D-isoglutamine, causes potent antitumor activity based on the immune reaction, as well as strong, immunoadjuvant activities. 相似文献
94.
Chikako Cheong Naoko Nonose Tsutomu Miura Akiharu Hioki 《Accreditation and quality assurance》2014,19(1):31-40
We studied to develop a certified reference material of seawater for nutrient analysis whose relative combined standard uncertainty for dissolved silicate was <0.5 %. In order to precisely measure the content of dissolved silicate in seawater, widely used absorption spectrometry with the so-called molybdenum blue was investigated as one of the highly sensitive determination methods. For the absorption spectrometry, a batch mode and a continuous flow analysis (CFA) mode were used and the characteristics of the calibration curves in the both modes were examined in detail. The calibration curve in the batch mode could be explained by a first-order regression line, whereas that in the CFA mode fitted to a second-order regression line. Therefore, for measuring the silicate content of seawater whose matrix depends on its origin, a standard addition method in a batch mode is preferable, though strict control of the compositions of the solutions for the standard addition calibration curve are greatly important for getting good linearity of the curve. In addition, in the case of the standard addition method, it is important to measure the blank value including the background; in the present study, the origins related to the blank were discussed and evaluated. The relative combined standard uncertainty of 0.48 % could be achieved for the measurement of content of 28 μmol/kg silicate in seawater, providing that the volume ratio between each of the molybdenum blue colorimetric reagents and the seawater was kept constant among all the solutions for the standard addition calibration curve. The procedure was validated using artificial seawater with a known concentration of silicate. Such highly improved precision and trueness which reaches the recent target of the community related to analysis of nutrients in seawater is reported for the first time. The developed procedure will provide a good way of validation for the analysts who need measurement with high precision and trueness on the content of silicate in seawater and other samples. 相似文献
95.
96.
Z. Hioki 《Zeitschrift fur Physik C Particles and Fields》1987,35(1):113-116
I discuss the determination ofW ± boson mass by the total cross-section ofe + e ?→W+W? process and its relation to tests of the electroweak higher order effects. In order to get rid of the confusion in recent theoretical arguments on this subjects, I arrange and clarify how to develop analysis once the corresponding experimental data become available. 相似文献
97.
98.
Satake A Tanaka H Hajjaj F Kawai T Kobuke Y 《Chemical communications (Cambridge, England)》2006,(24):2542-2544
Artificial light-harvesting antennae of coordination-organized macrocyclic porphyrin pentamer and hexamer are visualized by high resolution scanning tunneling microscopy (HRSTM) on a gold surface. 相似文献
99.
100.
Chen WH Nishikawa M Tan SD Yamamura M Satake A Kobuke Y 《Chemical communications (Cambridge, England)》2004,(7):872-873
A pH sensitive artificial ion channel, tetracyanoresorcin[4]arene, whose pK(a1) to pK(a3) are around pH 7, was synthesized. Conductivities for potassium ion were increased by the progress of dissociation at the channel mouth. 相似文献