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Search Results: 1 - 10 of 282 matches for " matsuzaki "
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Breast Surgery with Application of Doughnut Mastopexy Lumpectomy Technique  [PDF]
Kyoichi Matsuzaki
Modern Plastic Surgery (MPS) , 2012, DOI: 10.4236/mps.2012.24022
Abstract: Purpose: Doughnut mastopexy lumpectomy (DML) is a breast resection technique in which a tissue segment is removed and the breast reshaped through a doughnut-shaped de-epithelialized periareolar area. In this study, we attempted to determine whether the DML technique could be useful for other types of breast surgery, in addition to breast cancer lumpectomy. Methods: This study examined a total of 4 patients who underwent the DML technique and were followed up for at least 1 year postoperatively. One patient underwent phyllodes tumor resection, 1 patient underwent removal of a siliconoma, and 2 patients underwent breast reduction mammaplasty. Results: This method enabled en-bloc removal of a large tissue mass or large foreign body that could not be removed through a short periareolar incision. The surgical method of this study enabled the extent of de-epithelialization to be changed according to the size and location of the mass to be excised; good cosmetic results were also obtained. In addition, the surgical method enabled the facile excision of tumors and foreign materials. Conclusions: The DML technique is a useful surgical method that is applicable to other breast surgeries, in addition to breast cancer surgery.
Usefulness of Free Nipple-Areola Complex Graft for Nipple Malposition after Nipple Sparing Mastectomy  [PDF]
Kyoichi Matsuzaki
Modern Plastic Surgery (MPS) , 2012, DOI: 10.4236/mps.2012.24021
Abstract: Purpose: This article identifies the advantage and disadvantage of a free nipple areola complex graft (FNACG) for nipple malposition which resulted from tissue-expander insertion and subsequently replaced with an implant after nipple sparing mastectomy (NSM). Methods: The subjects were three such patients treated using FNACG and who were followed up for at least one year postoperatively. The surgical outcome was assessed for symmetry of nipple-areola position, graft take, depigmentation, and shrinkage. Results: In all patients, the graft was accurately transferred to a position to achieve symmetry with the unaffected breast, and there was complete graft take in the areola by simple surgical design and techniques. No depigmentation of the areola was observed. The size of the areola was almost unchanged after grafting in two patients, but areolar shrinkage occurred in one other patient. There was complete graft take in the nipple in one patient and no depigmentation of the nipple was observed. Necrosis occurred at the tip of the nipple in two other patients. These patients had depigmentation, and the height of nipples decreased in proportion to the level of necrosis. Conclusion: FNACG can be a useful method if its advantages and disadvantages are well considered.
Government Expenditure Financing in the Money-in-the-Production-Function Model  [PDF]
Akihiko Kaneko, Daisuke Matsuzaki
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.82008
Abstract: In this study, we consider a scenario in which the government resorts to an income and inflation tax to finance its expenditures in the money-in-the-production-function model. We show that a financing shift from the inflation tax to the income tax increases the real money holdings-to-capital ratio because the accumulation of capital is less favorable than holding money. We also find that a country’s economic growth rate is maximized if all government expenditures are financed through an income tax. For welfare maximization, the government should set the income tax rate higher than the growth maximizing tax rate and reimburse the excess revenue using money contraction.
Formation of Toxic Amyloid Fibrils by Amyloid β-Protein on Ganglioside Clusters
Katsumi Matsuzaki
International Journal of Alzheimer's Disease , 2011, DOI: 10.4061/2011/956104
Abstract: It is widely accepted that the conversion of the soluble, nontoxic amyloid β-protein (Aβ) monomer to aggregated toxic Aβ rich in β-sheet structures is central to the development of Alzheimer’s disease. However, the mechanism of the abnormal aggregation of Aβ in vivo is not well understood. Accumulating evidence suggests that lipid rafts (microdomains) in membranes mainly composed of sphingolipids (gangliosides and sphingomyelin) and cholesterol play a pivotal role in this process. This paper summarizes the molecular mechanisms by which Aβ aggregates on membranes containing ganglioside clusters, forming amyloid fibrils. Notably, the toxicity and physicochemical properties of the fibrils are different from those of Aβ amyloids formed in solution. Furthermore, differences between Aβ-(1–40) and Aβ-(1–42) in membrane interaction and amyloidogenesis are also emphasized.
125 GeV Technidilaton at the LHC
Matsuzaki, Shinya
High Energy Physics - Phenomenology , 2013,
Abstract: The technidilaton (TD) is a composite scalar predicted in walking technicolor (WTC), arising as a pseudo Nambu-Goldstone boson associated with the spontaneous breaking of the approximate scale invariance. Due to the Nambu-Goldstone boson's nature, the TD can be as light as the LHC boson that has been discovered at around 125 GeV. We discuss the size of the TD mass and the coupling properties relevant to the LHC study. It turns out that the TD couplings to the standard model (SM) particles take the same form as those of the SM Higgs boson, except the essentially distinguishable two ingredients: i) the overall coupling strengths set by the decay constant related to the spontaneous breaking of the scale invariance, which is in general not equal to the electroweak scale; ii) the couplings to photons and gluons which can include extra contributions from technifermion loops and hence can be enhanced compared to the SM Higgs case. To be concrete, we take the one-family technicolor model to explore the TD LHC phenomenology at 125 GeV. It is shown that the TD gives the signal consistent with the currently reported LHC data, notably can explain the excess in the diphoton channel, due to the extra contributions to digluon and diphoton couplings coming from the one-family technifermion loops.
Ordered bicontinuous double-diamond morphology in subsaturation nuclear matter
Masayuki Matsuzaki
Physics , 2005, DOI: 10.1103/PhysRevC.73.028801
Abstract: We propose to identify the new "intermediate" morphology in subsaturation nuclear matter observed in a recent quantum molecular dynamics simulation with the ordered bicontinuous double-diamond structure known in block copolymers. We estimate its energy density by incorporating the normalized area-volume relation given in a literature into the nuclear liquid drop model. The resulting energy density is higher than the other five known morphologies.
Dirac Sea Effects on Superfluidity in Nuclear Matter
Masayuki Matsuzaki
Physics , 1998, DOI: 10.1103/PhysRevC.58.3407
Abstract: We study two kinds of Dirac sea effects on the $^1S_0$ pairing gap in nuclear matter based on the relativistic Hartree approximation to quantum hadrodynamics and the Gor'kov formalism. We show that the vacuum fluctuation effect on the nucleon effective mass is more important than the direct coupling between the Fermi sea and the Dirac sea due to the pairing interaction. The effects of the high-momentum cutoff are also discussed.
Two-phonon $γ$-vibrational states in rotating triaxial odd-$A$ nuclei
Masayuki Matsuzaki
Physics , 2011, DOI: 10.1103/PhysRevC.83.054320
Abstract: Distribution of the two phonon $\gamma$ vibrational collectivity in the rotating triaxial odd-$A$ nucleus, $^{103}$Nb, that is one of the three nuclides for which experimental data were reported recently, is calculated in the framework of the particle vibration coupling model based on the cranked shell model plus random phase approximation. This framework was previously utilized for analyses of the zero and one phonon bands in other mass region and is applied to the two phonon band for the first time. In the present calculation, three sequences of two phonon bands share collectivity almost equally at finite rotation whereas the $K=\Omega+4$ state is the purest at zero rotation.
Changes in rotational characters of one- and two-phonon $γ$-vibrational bands in $^{105}$Mo
Masayuki Matsuzaki
Physics , 2014, DOI: 10.1093/ptep/ptu180
Abstract: The $\gamma$ vibration is the most typical low-lying collective motion prevailing the nuclear chart. But only few one-phonon rotational bands in odd-$A$ nuclei have been known. Furthermore, two-phonon states, even the band head, have been observed in a very limited number of nuclides not only of odd-$A$ but even-even. Among them, that in $^{105}$Mo is unique in that Coriolis effects are expected to be stronger than in $^{103}$Nb and $^{105}$Nb on which theoretical studies were reported. Then the purpose of the present work is to study $^{105}$Mo paying attention to rotational character change of the one-phonon and two-phonon bands. The particle-vibration coupling model based on the cranking model and the random-phase approximation is used to calculate the vibrational states in rotating odd-$A$ nuclei. The present model reproduces the observed yrast zero-phonon and one-phonon bands well. Emerging general features of the rotational character change from low spin to high spin are elucidated. In particular, the reason why the one-phonon band does not exhibit signature splitting is clarified. The calculated collectivity of the two-phonon states, however, is located higher than observed.
Spatial structure of quark Cooper pairs in a color superconductor
Masayuki Matsuzaki
Physics , 1999, DOI: 10.1103/PhysRevD.62.017501
Abstract: Spatial structure of Cooper pairs with quantum numbers color 3^*, I=J=L=S=0 in ud 2 flavor quark matter is studied by solving the gap equation and calculating the coherence length in full momentum range without the weak coupling approximation. Although the gap at the Fermi surface and the coherence length depend on density weakly, the shape of the r-space pair wave function varies strongly with density. This result indicates that quark Cooper pairs become more bosonic at higher densities.
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