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Institution

Tokyo University of Science

EducationTokyo, Japan
About: Tokyo University of Science is a education organization based out in Tokyo, Japan. It is known for research contribution in the topics: Thin film & Enantioselective synthesis. The organization has 15800 authors who have published 24147 publications receiving 438081 citations. The organization is also known as: Tōkyō Rika Daigaku & Science University of Tokyo.


Papers
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Journal ArticleDOI
TL;DR: This study describes a novel one-pot procedure for a directly reductive conversion of the carbonyl function of esters to the corresponding ethers by Et3SiH in the presence of a catalytic amount of InBr3.
Abstract: This study describes a novel one-pot procedure for a directly reductive conversion of the carbonyl function of esters to the corresponding ethers by Et3SiH in the presence of a catalytic amount of InBr3.

132 citations

Journal ArticleDOI
TL;DR: The amplification of ee in the asymmetric autocatalysis of 5-pyrimidyl alkanols in the reaction between diisopropylzinc (i-Pr2Zn) and pyrimidine-5-carbaldehydes is described, which can link various proposed origins of chirality with highly enantioenriched organic compounds in conjunction with asymmetric Autocoatalysis.
Abstract: ConspectusAmplification of enantiomeric excess (ee) is a key feature for the chemical evolution of biological homochirality from the origin of chirality. We describe the amplification of ee in the asymmetric autocatalysis of 5-pyrimidyl alkanols in the reaction between diisopropylzinc (i-Pr2Zn) and pyrimidine-5-carbaldehydes. During the reaction, an extremely low ee (ca. 0.00005% ee) can be amplified to >99.5% ee, and therefore, the initial slightly major enantiomer is automultiplied by a factor of ca. 630000, while the initial slightly minor enantiomer is automultiplied by a factor of less than 1000. In addition, pyrimidyl alkanols with various substituents at the 2-position of the pyrimidine ring, 3-quinolyl alkanol, 5-carbamoyl-3-pyridyl alkanol, and large multifunctionalized pyrimidyl alkanols also act as highly efficient asymmetric autocatalysts in the addition of i-Pr2Zn to the corresponding aldehydes.The asymmetric autocatalysis of pyrimidyl alkanol can discriminate the chirality of various compoun...

131 citations

Journal ArticleDOI
TL;DR: A flow cytometry protocol that can be used in the diagnostic work-up of low-grade myelodysplastic syndrome patients who lack specific diagnostic markers is proposed and verified its diagnostic utility in patients without those diagnostic markers.
Abstract: Background The diagnosis of myelodysplastic syndromes is not always straightforward when patients lack specific diagnostic markers, such as blast excess, karyotype abnormality, and ringed sideroblasts.Design and Methods We designed a flow cytometry protocol applicable in many laboratories and verified its diagnostic utility in patients without those diagnostic markers. The cardinal parameters, analyzable from one cell aliquot, were myeloblasts (%), B-cell progenitors (%), myeloblast CD45 expression, and channel number of side scatter where the maximum number of granulocytes occurs. The adjunctive parameters were CD11b, CD15, and CD56 expression (%) on myeloblasts. Marrow samples from 106 control patients with cytopenia and 134 low-grade myelodysplastic syndromes patients, including 81 lacking both ringed sideroblasts and cytogenetic aberrations, were prospectively analyzed in Japan and Italy.Results Data outside the predetermined reference range in 2 or more parameters (multiple abnormalities) were common in myelodysplastic syndromes patients. In those lacking ringed sideroblasts and cytogenetic aberrations, multiple abnormalities were observed in 8/26 Japanese (30.8%) and 37/55 Italians (67.3%) when the cardinal parameters alone were considered, and in 17/26 Japanese (65.4%) and 42/47 Italians (89.4%) when all parameters were taken into account. Multiple abnormalities were rare in controls. When data from all parameters were used, the diagnostic sensitivities were 65% and 89%, specificities were 98% and 90%, and likelihood ratios were 28.1 and 8.5 for the Japanese and Italian cohorts, respectively.Conclusions This protocol can be used in the diagnostic work-up of low-grade myelodysplastic syndromes patients who lack specific diagnostic markers, although further improvement in diagnostic power is desirable.

131 citations

Journal ArticleDOI
01 Jul 1995-Langmuir
TL;DR: In this paper, spontaneous vesicle formation in aqueous mixture of didodecyldimethylammonium bromide (DDAB) and sodium dodecyl sulfate (SDS) has been investigated with differential interference microscopy and transmission electron microscopy.
Abstract: Spontaneous vesicle formation in the aqueous mixture of didodecyldimethylammonium bromide (DDAB) and sodium dodecyl sulfate (SDS) has been investigated with differential interference microscopy, transmission electron microscopy, glucose trapping experiments, ζ potential measurements, and surface tension measurements. The micrographs of the DDAB-SDS mixtures confirm the spontaneous formation of polydispersed vesicles including giant vesicle with a diameter less 40 μm. The captured volume of the DDAB -SDS mixtures is 2.2 L/mol at the SDS mole fraction (X SDS ) of 0.64 and decreases with increasing X SDS . Vesicle formation in DDAB-SDS mixtures will occur in the X SDS range of 0.64-0.75, below the total surfactant concentration of 2.2 wt %. Surface tension measurements for the mixtures exhibit very low values, 23 mN/m, indicating the ion-pairing of DDAB and SDS, a pseudo-zwitterionic surfactant. This surfactant favors the morphology of a vesicle. The mechanism of vesicle self-formation is the penetration of SDS into the DDAB molecules. In addition, spontaneous vesicles are also formed in the mixture of DDAB and sodium decyl sulfate.

131 citations

Journal ArticleDOI
TL;DR: Human space exploration is dependent on robust spacecraft design and sophisticated life-support technologies, both of which are critical for working in the hostile space environment.
Abstract: Human space exploration is dependent on robust spacecraft design and sophisticated life-support technologies, both of which are critical for working in the hostile space environment. This article focuses on the specific challenges of the space environment. In an upcoming issue, a Dispatch from Space

131 citations


Authors

Showing all 15878 results

NameH-indexPapersCitations
Kazunori Kataoka13890870412
Yoichiro Iwakura12970564041
Kouji Matsushima12459056995
Masaki Ishitsuka10362439383
Shinsuke Tanabe9872237445
Tatsumi Koi9741150222
Hirofumi Akagi9461843179
Clifford A. Lowell9125823538
Teruo Okano9160528346
László Á. Gergely8942660674
T. Sumiyoshi8885562277
Toshinori Nakayama8640525275
Akihiko Kudo8632839475
Hans-Joachim Gabius8569928085
Motohide Tamura85100732725
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202356
2022137
20211,357
20201,481
20191,510
20181,429