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11.
Ultrafiltration membrane was prepared from poly(vinyl butyral). The effects of membrane thickness, polymer concentration, evaporation time, and evaporation temperature, etc., on the performance of the resulting membranes have been studied. Dimethylacetamide was used as a casting solvent. The membrane formed by casting the polymer from a 15 wt % solution and evaporation at 25°C for 30 s had a flux value of 250 cm3 / cm2 h (4.8 kg/cm2, 26°C) at 92.9% rejection level for dextran sodium sulfate (average mol. wt. 550,000) separation. © 1993 John Wiley & Sons, Inc. 相似文献
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Sota H Yoshimine H Whittier RF Gotoh M Shinohara Y Hasegawa Y Okahata Y 《Analytical chemistry》2002,74(15):3592-3598
Despite high theoretical sensitivity, low-cost manufacture, and compactness potentially amenable to lab-on-a-chip use, practical hurdles have stymied the application of the quartz crystal microbalance (QCM) for aqueous applications such as detection of biomolecular interactions. The chief difficulty lies in achieving a sufficiently stable resonance signal in the presence of even minute fluctuations in hydrostatic pressure. In this work, we present a novel versatile planar sensor chip design (QCM chip) for a microliter-scale on-line biosensor. By sealing the quartz resonator along its edges to a flat, solid support, we provide uniform support for the crystal face not exposed to solvent, greatly decreasing deformation of the crystal resonator under hydrostatic pressure. Furthermore, this cassette design obviates the need for direct handling when exchanging the delicate quartz crystal in the flow cell. A prototype 27-MHz sensor signal exhibited very low noise over a range of flow rates up to 100 microL/min. In contrast, signals obtained from a conventional QCM sensor employing an O-ring-based holder were less stable and deteriorated even further with increasing flow rate. Additional control designs with intermediate amounts of unsupported undersurface yielded intermediate levels of stability, consistent with the interpretation that deformation of the crystal resonator under fluctuating hydraulic pressure is the chief source of noise. As a practical demonstration of the design's high effective sensitivity, we readily detected interaction between myoglobin and surface-bound antibody. 相似文献
15.
Seiichiro Katagiri SungGi Chi Yosuke Minami Kentaro Fukushima Hirohiko Shibayama Naoko Hosono Takahiro Yamauchi Takanobu Morishita Takeshi Kondo Masamitsu Yanada Kazuhito Yamamoto Junya Kuroda Kensuke Usuki Daigo Akahane Akihiko Gotoh 《International journal of molecular sciences》2022,23(9)
KIT is a type-III receptor tyrosine kinase that contributes to cell signaling in various cells. Since KIT is activated by overexpression or mutation and plays an important role in the development of some cancers, such as gastrointestinal stromal tumors and mast cell disease, molecular therapies targeting KIT mutations are being developed. In acute myeloid leukemia (AML), genome profiling via next-generation sequencing has shown that several genes that are mutated in patients with AML impact patients’ prognosis. Moreover, it was suggested that precision-medicine-based treatment using genomic data will improve treatment outcomes for AML patients. This paper presents (1) previous studies regarding the role of KIT mutations in AML, (2) the data in AML with KIT mutations from the HM-SCREEN-Japan-01 study, a genome profiling study for patients newly diagnosed with AML who are unsuitable for the standard first-line treatment (unfit) or have relapsed/refractory AML, and (3) new therapies targeting KIT mutations, such as tyrosine kinase inhibitors and heat shock protein 90 inhibitors. In this era when genome profiling via next-generation sequencing is becoming more common, KIT mutations are attractive novel molecular targets in AML. 相似文献
16.
Naohiro Gotoh Shino Miyake Hiroko Takei Kumi Sasaki Saori Okuda Michitaka Ishinaga Shun Wada 《Food Analytical Methods》2011,4(4):525-530
We developed a simple method for quantification of the peroxide value (PV) in colored lipids on the basis of the reaction
between triphenylphosphine (TPP) and oxidized oil to afford triphenylphosphineoxide (TPPO). Diphenylphosphineoxide (DPPO)
was employed as internal standard. The formed TPPO was analyzed by high-pressure liquid chromatography–UV spectroscopy with
absorption at 260 nm. The conditions that gave the highest correlative calibration curve between the peak area on the chromatogram
and peroxide value were identified: the optimum TPP–oxidized oil mix ratio, reaction temperature, and reaction time were found
to be 2:1, 40 °C, and 30 min, respectively. Linear calibration curves, passing through the origin, were obtained for PV versus
TPPO and TPPO versus DPPO. The quantification limit for this method was 2.01 pmol hydroperoxyl group, which corresponds to
a PV value of 0.2 meq/kg in a 10-mg oil sample. This method was used to measure the PV in colored fats and oils or lipids
extracted from dark meat and processed food containing a coloring agent. Though the official method could not measure the
PVs in the colored lipids, the method proposed here, which uses an inexpensive chemical reagent and machine, could. The developed
method could play an important role for food quality control. 相似文献
17.
Mechanical and physical properties of epoxy composites reinforced by vapor grown carbon nanofibers 总被引:1,自引:0,他引:1
Epoxy/vapor grown carbon nanofiber composites (VGCF) with different proportions of VGCF were fabricated by the in situ process.The VGCFs were well dispersed in both of the low and high viscosity epoxy matrices, although occasional small aggregates were observed in a high viscosity epoxy of 20 wt.%. The dynamic mechanical behavior of the nanocomposite sheets was studied. The storage modulus and the glass transition temperature (Tg) of the polymer were increased by the incorporation of VGCFs.The electrical and mechanical properties of the epoxy-VGCFs nanocomposite sheets with different weight percentages of VGCFs were discussed. The results were that both had maximum tensile strength and Young’s modulus at 5 wt.% for both materials and reduced the fracture strain with increasing filler content. The electrical resistivity was decreased with the addition of filler content. Mechanical, electrical and thermal properties of low viscosity epoxy composites were resulted better than that of the high viscosity composites. 相似文献
18.
Electrochemical behavior of Al and Al alloy films in zincate solution was investigated to elucidate the effect of the zincate pretreatment for electroless NiP deposition, which is used for under bump metallization for LSI interconnects. The immersion potential for AlCu and AlSiCu, immediately reached to constant, which was almost equal potential to zinc reference electrode. The corrosion current for the AlCu and AlSiCu films was larger than that of the Al and AlSi films in the zincate solution. It was also confirmed that the deposited Zn at the surface of AlCu and AlSiCu films possessed smaller grain size and larger amount of nucleation, resulted in the formation of flat NiP films. 相似文献
19.
Manabu Gotoh 《Metals and Materials International》1998,4(4):628-639
Various types of behavior due to plastic instability under uniaxial tension and compression are numerically investigated regarding
sheet materials, plane strain blocks, and cylindrical bars and hollow cylinders. The code GOLDA for analysis of large elastic-plastic
deformation previously developed by the author is used, which is one of quasi-static explicit FEM programs. Both of diffuse
type and localized type of instability are concerned with. The role of vertex-hardening in plastic instability is payed attention,
by using the J2G (J2-Gotoh’s corner theory) as the plasticity constitutive equation, which was proposed previously by the
author and is a kind of vertex-hardening theory. Following results are mainly derived. 1) In plane strain tension, shear-type
strain localization is realized by the use of J2G, but not by the conventional J2F (J2-flow theory). In axisymmetric tension
of a cylindrical solid bar, however, such strain localization would never appear even by J2G, as expected by the experiment.
2) In axisymmetric tension of a hollow cylinder under the condition of no contractlion of its bore (therefore, in almost plane
strain state with no circumferential strain), it is found that shear-type strain localization could occur. This is realized
again by the use of J2G, whereas J2F never allows such strain localization. 3) In compression under the embedded edges condition,
it is found that a sheet with initial aspect ratio of 2:1 (in height:breadth) yields double barreling, whereas a plane strain
block yields double barreling at the initial aspect ratio of 3:1, not at 2:1 though expected from the conventional slip-line
theory. As for a cylindrical solid bar, double barreling appears for the initial aspect ratio of 2:1 but only for higher n-vaiue
(the strain hardening exponent), say n=0.5. 4) As for barreling mode, when thick-walled axisymmetric tubes with the initial
ratio of thickness to inner diameter 1/5 to 1/3 are compressed axially, corresponding to the initial aspect ratios of 3:1,
2:1 and 1:1, triple barreling, double barreling and single barreling appear, respectively. 5) It is found that thin-walled
tubes buckle in a progressive periodic mode with almost stationary compressive load under axial compression. Thus it can be
used as a simplified model for buckling of more complex structures such as the honeycomb. 相似文献
20.
Takeyuki Gotoh Fuyuki Abe Takenori Ishizu Masaki Yoshio 《Journal of power sources》1996,60(2):193-196
A study of the pyrolysis of an aqueous solution of manganese nitrate in the presence of silver compounds has been carried out. Thermal analysis showed that the MnO2 formation temperature and the transformation temperature from MnO2 to Mn2O3 shifted towards a lower temperature in the presence of silver acetate. A large particle-size and high crystallinity MnO2 was formed; this may be a useful method of making an excellent tantalum capacitor with high capacitance. 相似文献