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Science

Fujiwara, A.
(Graduate School of Science)
Strong Consistency and Asymptotic Efficiency for Adaptive Quantum Estimation Problems
Journal of Physics A: Mathematical and General, 39, 12489-12504 (2006)

Identifying the state of a quantum system under investigation is one of the most fundamental issue in quantum statistics and quantum information theory. In this paper, it is shown that for an adaptive quantum estimation scheme based on locally unbiased measurements, the sequence of maximum likelihood estimators is strongly consistent and asymptotically efficient. This result settles the long standing open question as to how one could interpret the quantum Cramer-Rao lower bound from an operational point of view.


10  Kinoshita, M. ; Kamagata, K. ; Maeda, A. ; Goto, Y.; Komatsuzaki, T. ; Takahashi, S.
(Institute for Protein Research)
Development of a Technique for the Investigation of Folding Dynamics of Single Proteins for Extended Time Periods
Proceedings of the National Academy of Sciences of the United States of America, 104, 10453-10458 (2007)

A new technique was developed for the detection of fluorescence signals from free single molecules for extended periods. Iso-1-cytochrome c (cyt c) labeled with fluorescent dye were slowly injected into a capillary. The fluorescence from single molecules of cyt c was imaged as traces, which reflect the time-dependent changes of the sample conformations. Intensity histograms of the traces revealed two distributions, which correspond to the unfolded and intermediate states. The technique was expected to reveal dynamics of proteins along the folding processes without artifacts caused by immobilization.


11 Nojiri, M.*1; Xie, Y.; Inoue, T.*2; Yamamoto, T.; Matsumura, H.*2; Kataoka, K.; Deligeer, Yamaguchi, K.*1; Kai, Y.*2; Suzuki, S.*1
*1(Graduate School of Science)
*2(Graduate School of Engineering)
Structure and Function of a Hexameric Copper-containing Nitrite Reductase
Proceeding of the National Academy of Sciences of the United States of America, 104, 4315-4320 (2007)


12 Ono, Y.; Shikata, T.
(Graduate School of Science)
Hydration and Dynamic Behavior of Poly(N-isopropylacrylamide)s in Aqueous Solution: A Sharp Phase Transition at the Lower Critical Solution Temperature
Journal of the American Chemical Society, 128, 10030-10031(2006)

We precisely determined the number of hydrated water molecules, nh, per monomer unit of poly(N-isopropylacrylamide), PNIPAm, to be 11 in aqueous solution below the lower critical solution temperature, LCST, of 32°C using high frequency dielectric relaxation measurements up to 20 GHz. The value of nh decreases dramatically at the LCST and the solution becomes turbid above that. The reason for the sharp phase transition at the LCST is the cooperative dehydration of water molecules hydrated to each PNIPAm unit.


13 Osakada, Y.; Kawai, K.; Fujitsuka, M.; Majima, T.
(Institute of Scientific and Industrial Research)
Charge Transfer Through DNA Nanoscaled Assembly Programmable with DNA Building Blocks
Proceedings of the National Academy of Sciences of the United States of America, 103, 18072-18076 (2006)


14 Suzuki, S.; Morita, Y.; Fukui, K.; Sato, K.; Shiomi, D.; Takui, T.; Nakasuji, K.
(Graduate School of Science)
Aromaticity on the Pancake-Bonded Dimer of Neutral Phenalenyl Radical as Studied by MS and NMR Spectroscopies and NICS Analysis
Journal of the American Chemical Society, 128, 2530-2531 (2006)

This paper reports on the first disclosure of experimental evidences on the structure of neutral radical aggregate in a solution state at low temperature probed by cold-spray ionization mass and solution NMR spectroscopies with help of quantum chemical calculations, demonstrating an unprecedented chemical bonding of 12-center-2-electron nature. Discussion on a local magnetic environment of the neutral radical aggregate in terms of aromaticity contributes to the breakthrough in material designs and conceptual advances in the field of molecular magnetism.


15 Tsukamoto, K.; Ohishi, H.; Hiyama, Y.; Maezaki, N.; Tanaka, T.; Ishida, T.
(Graduate School of Pharmaceutical Sciences)
Self-assembled Octameric Cage Constructed by the Potassium Salt of p-tert-Butylcalix[6]arene p-Bromophenylalanine Derivative in the Solid State
Chemical Communications, 3606-3608 (2006)

A novel nano-sized molecular cage was developed just neutralizing of the calix[6]arene amino acid derivative by potassium carbonate. The structure of the cage was revealed at an atomic level by X-ray crystallographic analysis using synchrotron radiation. In the structure, the amino acid residues of the calixarene derivatives were intermolecularly aggregated around potassium ions. The cage, which was formed eight calixarene derivatives, possessed large inner space of which the volume was about 1 nm3.


16 Yano, M.*1; Sekiyama, A.*1; Fujiwara, H.*1; Saita, T.*1; Imada, S.*1; Muro, T.; Onuki, Y.*2; Suga, S.*1
*1(Graduate School of Engineering Science)
*2(Graduate School of Science)
Three-Dimensional Bulk Fermiology of CeRu2Ge2 in the Paramagnetic Phase by Soft X-Ray hv-Dependent (700-860 eV) ARPES
Physical Review Letters, 98, 036405/1-4 (2007)


17 Yokota, K.; Taniguchi, M.; Kawai, T.
(The Institute of Scientific and Industrial Research)
Control of the Electrode-Molecule Interface for Molecular Devices
Journal of the American Chemical Society, 129, 5818-5819 (2007)

We systematically investigated the bonding property and the electronic states of the monolayers of benzenethiol, benzeneselenol, and biphenyl ditelluride. To date, Au-S bonds have often been used in molecular devices as an extension of self-assembled films. However we found that the Au-Se bond was more suitable for molecular devices than the other bonds. This result is expected to contribute to improving the electric conduction property of currently developed molecular devices and to enhancing the device properties.


18 Yoshioka, S.*1; Nakamura, E.*2; Kinoshita, S.*1
*1(Graduate School of Frontier Biosciences)
*2(Graduate School of Science)
Origin of two-color iridescence in rock dove's feather
The Journal of the Physical Society of Japan, 76, 013801 (2007)

The iridescence of the rock dove's neck feather has peculiar optical characteristics; the color change with angle is limited only in two colors, green and purple. We have discovered that this two-color iridescence originates from the surprisingly simple physical mechanism—thin-layer interference. The peculiarity lies in the fact that the higher-order interference condition is satisfied. The two-color nature is successfully explained by the sophisticated correspondence in the spectral line shape between the reflectance and the visual color sensitivities of human eye.


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