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- N Yokota, M Uchijima, S Nishizawa, H Namba, Y Koide
- Stroke
- 2001

BACKGROUND AND PURPOSE
The purpose of this study is to identify new molecules that play important roles in the phenomena that occur in the hippocampus after transient global cerebral ischemia, as clues to better understanding of the mechanisms.
METHODS
A subtractive cDNA library was established by suppression subtractive hybridization of rat hippocampal… (More)

- Hideo Fusaoka, Yoshio Koide
- 1997

Stimulated by recent development of the calculation methods of the running quark masses m q (µ) and renewal of the input data, for the purpose of making a standard table of m q (µ) for convenience of particle physicists, the values of m q (µ) at various energy scales µ (µ = 1 GeV, µ = m c , µ = m b , µ = m t and so on), especially at µ = m Z , are… (More)

In the standard model, the lepton masses appear as arbitrary constants determined by experiment. But in 1982, Yoshio Koide proposed a formula for the charged lepton masses that is still going strong a quarter century later. The success of Koide's formula remains unexplained, but its perfect accuracy, and its simplicity in explaining the charged lepton mass… (More)

- Yoshio Koide
- 2008

Why the charged lepton mass formula m e + m µ + m τ = 2 3 (√ m e + √ m µ + √ m τ) 2 is mysterious is reviewed, and guiding principles to solve the mystery are presented. According to the principles, an example of such a mass generation mechanism is proposed, where the origin of the mass spectrum is attributed not to the structure of the Yukawa coupling… (More)

- Yoshio Koide
- 2008

As an attempt to give an unified description of quark and lepton mass matrices M f , the following mass matrix form is proposed: the form of the mass matrices are invariant under a cyclic permutation (f 1 →f 2 , f 2 →f 3 , f 3 →f 1) among the fermions f i. The model naturally leads to the maximal mixing between ν µ and ν τ , and with an additional ansatz,… (More)

- Yoshio Koide
- 2006

Brannen has recently pointed out that the observed charged lepton masses satisfy the relation m e +m µ +m τ = 2 3 (√ m e + √ m µ + √ m τ) 2 , while the observed neutrino masses satisfy the relation m ν1 + m ν2 + m ν3 = 2 3 (− √ m ν1 + √ m ν2 + √ m ν3) 2. It is discussed what neutrino Yukawa interaction form is favorable if we take the fact pointed out by… (More)

- Yoshio Koide
- 2001

The eigenvalues and mixing angles in the Zee model are investigated parameter-independently. When we require |∆m 2 12 /∆m 2 23 | ≪ 1 in order to understand the solar and atmospheric data simultaneously, the only solution is one which gives bi-maximal mixing. It is pointed out that the observed values sin 2 2θ solar ≃ 0.66 in the MSW LMA solution cannot be… (More)

- Yoshio Koide, Ambar Ghosal
- 2000

A Zee-type neutrino mass matrix model with a badly broken horizontal symmetry SU(3) H is investigated. By putting a simple ansatz on the symmetry breaking effects of SU(3) H for transition matrix elements, it is demonstrated that the model can give a nearly bimaximal neutrino mixing with the ratio ∆m 2 solar /∆m 2 atm ≃ √ 2m e /m µ = 6.7 × 10 −3 , which are… (More)

Maximal CP violation hypothesis is applied to a simple lepton mixing matrix form U = V † CKM U T B , which has recently been speculated under an ansatz that U becomes an exact tribimaximal mixing U T B in a limit of the quark mixing matrix V CKM → 1. The prediction tan 2 θ 12 = 1/2 in the case of the exact tribimaximal mixing U = U T B is considerably… (More)

- Yoshio KOIDE, Hiroyuki NISHIURA, Koichi MATSUDA, Tatsuru KIKUCHI, Takeshi FUKUYAMA
- 2008

Recent neutrino data have been favourable to a nearly bimaximal mixing, which suggests a simple form of the neutrino mass matrix. Stimulated by this matrix form, a possibility that all the mass matrices of quarks and leptons have the same form as in the neutrinos is investigated. The mass matrix form is constrained by a discrete symmetry Z 3 and a… (More)