Introducing neutrino mass into universal extra dimension models and solving cosmological problem

Universal extra dimension (UED) models with right-handed neutrinos are studied. The introduction of the neutrinos makes us possible not only to describe Dirac neutrino masses but also to solve the cosmological problem called the KK graviton problem. This problem is essentially caused by the late time decay of a KK photon into a KK graviton and a photon, and it distorts the spectrum of the cosmic microwave background or the diffuse photon. We point out that, once we introduce right-handed neutrinos to UED models, the KK photon decays dominantly into neutrinos and does not emit a photon. We also discuss sub-dominant modes with a photon in the decay quantitatively, and show that their branching ratios are so small that the spectra are not distorted.Electronic version of an article published as International Journal of Modern Physics E, Vol: 16, Issue: 5(June 2007), 2007, P1571 - P1582,DOI:10.1142/S0218301307006897 (c)copyright World Scientific Publishing Company http://www.worldscinet.com/cgi-bin/details.cgi?id=pii:S0218301307006708&type=htmltextapplication/pdfjournal articl

Measurement of branching fraction and time-dependent CP asymmetry parameters in B^0 → D^*+D^*-K^{0}_{S}decays

We present a measurement of the branching fraction and time-dependent CP violation parameters for B^0 → D^*+D^*-K^{0}_{S} decays. These results are obtained from a 414 fb^{-1} data sample that contains 449×10^6 B\bar{B} pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We obtain the branching fraction, B(B^0→D^*+D*^-K^{O}_{S})= [3.4±0.4(stat)±0.7(syst)]×10^-3, which is in agreement with the current world average. We also obtain an upper limit on the product branching fraction for a possible two-body decay, B(B^0 → D_s1^+(2536)D^*-)B(D_s1^+(2536)→ D^*+K^{O}_{S})s^+, where s^±[equivalent]m2(D^*±K^{0}_{S}), we extract the CP violation parameters, J_c/J_0=0.60^{+0.25}_{-0.28}(stat)±0.08(syst), 2J_s1/J_0sin2φ_1=-0.17^{+0.42}_{-0.42}(stat)±0.09(syst), 2J_s2/J_0cos2φ_1=-0.23^{+0.43}_{-0.41}(stat)±0.13(syst). A large value of J_c/J_0 would indicate a significant resonant contribution from a broad unknown D_s^**+ state. Although the sign of the factor, 2J_s2/J_0, can be deduced from theory, no conclusion can be drawn regarding the sign of cos2φ_1 given the errors.journal articl

Inclusive Measurement of the Photon Energy Spectrum in b→sγ Decays

journal articl

三好研究助成調査報告 : 都市解析手法に関する最新技術研究の視察および適用事例の調査 : 平成12年度三好研究助成調査報告

departmental bulletin pape

クラシックとジャズを奏でる大きな弦楽器の如く

departmental bulletin pape

Environmental pressure leads to highly correlated transcriptional response

<p><b>Copyright information:</b></p><p>Taken from "Genome-wide transcriptional plasticity underlies cellular adaptation to novel challenge"</p><p></p><p>Molecular Systems Biology 2007;3():106-106.</p><p>Published online 24 Apr 2007</p><p>PMCID:PMC1865588.</p><p>Copyright © 2007, EMBO and Nature Publishing Group</p> () Color-coded figure of transcriptional response for the eight time points in the two experiments, with no (top) and with 40 mM (bottom). The genes were ordered in each experiment according to the clusters presented in . The significant increase in coherency of the response with the increase of environmental pressure by is apparent in the image. Expression profiles of genes belonging to glycolysis (), histidine () and purine () pathways. Note the emergence of highly correlated patterns of transcription owing to the environmental pressure in the lower panel. A given functional module simultaneously contains correlated and anti-correlated trajectories

Steady-state transcriptional pattern is well predicted from the transient response

<p><b>Copyright information:</b></p><p>Taken from "Genome-wide transcriptional plasticity underlies cellular adaptation to novel challenge"</p><p></p><p>Molecular Systems Biology 2007;3():106-106.</p><p>Published online 24 Apr 2007</p><p>PMCID:PMC1865588.</p><p>Copyright © 2007, EMBO and Nature Publishing Group</p> The steady-state expression level (average of the two measurement points in glucose steady state) versus the transient expression level (4th time point in ) for the experiment with 40 mM . The Pearson correlation between the transient response and steady state is 0.76. The slope deviation from the reference dashed black line represents the overshoot or undershoot in transient expression levels compared to the steady state

Interferon gamma, lipopolysaccharide, and modified-live viral vaccines stimulation alter the mRNA expression of tumor necrosis factor α, inducible nitric oxide synthase, and interferon β in bovine alveolar macrophages

application/pdfVeterinary Immunology and Immunopathology. 2022, 244, P.110378(1-4)journal articl

Fabrication of Hollow Structures in Photodegradable Hydrogels Using a Multi-Photon Excitation Process for Blood Vessel Tissue Engineering

Engineered blood vessels generally recapitulate vascular function in vitro and can be utilized in drug discovery as a novel microphysiological system. Recently, various methods to fabricate vascular models in hydrogels have been reported to study the blood vessel functions in vitro; however, in general, it is difficult to fabricate hollow structures with a designed size and structure with a tens of micrometers scale for blood vessel tissue engineering. This study reports a method to fabricate the hollow structures in photodegradable hydrogels prepared in a microfluidic device. An infrared femtosecond pulsed laser, employed to induce photodegradation via multi-photon excitation, was scanned in the hydrogel in a program-controlled manner for fabricating the designed hollow structures. The photodegradable hydrogel was prepared by a crosslinking reaction between an azide-modified gelatin solution and a dibenzocyclooctyl-terminated photocleavable tetra-arm polyethylene glycol crosslinker solution. After assessing the composition of the photodegradable hydrogel in terms of swelling and cell adhesion, the hydrogel prepared in the microfluidic device was processed by laser scanning to fabricate linear and branched hollow structures present in it. We introduced a microsphere suspension into the fabricated structure in photodegradable hydrogels, and confirmed the fabrication of perfusable hollow structures of designed patterns via the multi-photon excitation process.journal articl

The effect of laser-hearing aid for age-related hearing loss

赤外光レーザーを人工内耳に応用することで、外科手術を必要としない新たな聴覚補助具を開発できる。本研究の目的は、赤外光レーザー人工内耳に用いる最適な音声エンコード法を、模擬音声を用いて確立することである．模擬音として老人聴覚モデル音（AHLsim）と赤外光レーザー模擬音（CMS）を用いた．結果としてAHSsimにCMSを加え聴取すると正答率が上昇した．これは赤外光レーザーで老人の音声聴取を支援できる可能性を示唆している．Cochlear implants are widely used to compensate for the hearing loss, but the devices require surgery to insert the electrodes into the cochlea. Stimulating the auditory nerves with an infrared laser may produce hearing without the surgery. The purpose of this study was to establish the speech encoding scheme for an auditory prosthesis with an infrared laser, and evaluate its efficacy for age-related hearing loss (AHL). We synthesized Click-modulated sound (CMS) as simulation sounds for the laser auditory prosthesis, and age-related hearing loss simulation sounds (AHLsim). Six native Japanese speakers with normal hearing participated in the experiment, and AHLsim, CMS, or AHLsim and CMS simultaneously (AHLsim+CMS) were presented. They reported their perceptions of each stimulus. As a result, the correct answer rate of AHLsim+CMS was significantly higher than that of AHLsim, especially for consonants in the high frequency area (i.e. K, S, H). Our data suggest that irradiating the high-frequency region with an infrared laser may support speech recognition of elderly people.application/pdfdepartmental bulletin pape