Ken Sasaki

Discrimination of larval sex and timing of male brood elimination by workers in honeybees (Apis mellifera L.) (2004)

We discuss target mass effects in the polarized virtual photon structure functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ for the kinematic region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2...

Ken Sasaki, Hiroyuki Kitamura, Yoshiaki Obara

To test a hypothesis that workers in social Hymenoptera can identify male broods at early stages of development and eliminate them to avert excessive investments in male brood, the ability of larval...

Spinning eggs--which end will rise? (2003)

Target Mass Effects in Polarized Virtual Photon Structure Functions (2003)

We examine the spinning behavior of egg-shaped axisymmetric bodies whose cross sections are described by several oval curves similar to real eggs with thin and fat ends. We use the gyroscopic balance...

Twist-3 effects for polarized virtual photon structure function $g_2^\gamma$ (2002)

We study target mass effects in the polarized virtual photon structure functions $g_1^\gamma (x,Q^2,P^2)$, $g_2^\gamma (x,Q^2,P^2)$ in the kinematic region $\Lambda^2\ll P^2 \ll Q^2$, where $-Q^2...

Virtual photon structure functions and positivity constraints (2002)

We investigate twist-3 effects in the polarized virtual photon. The structure function $g_2^\gamma$, which exists only for the virtual photon target and can be measured in future polarized $e^+ e^-$...

Sasaki, Ken, Soffer, J., Uematsu, T., 佐々木, 賢, ササキ, ケン, ...

We study the three positivity constraints on the eight virtual photon structure functions, derived from the Cauchy-Schwarz inequality and which are, hence, model independent. The photon structure...

Virtual photon structure functions and positivity constraints (2002)

Sasaki, Ken, Soffer, Jacques, Uematsu, Tsuneo

We study the three positivity constraints among the eight virtual photon structure functions, derived from the Cauchy-Schwarz inequality and which are hence model-independent. The photon structure...

Twist-3 Effects in Polarized Photon Structure (2002)

Polarized Photon Structure: $g_1^\gamma$ and $g_2^\gamma$ (2002)

The polarized photon structure is described by two spin structure functions $g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized ep or e$^+$e$^-$ colliders. Here we investigate...

Polarized Virtual Photon Structure Function $g_2^\gamma$ and Twist-3 Effects in QCD (2002)

We investigate the polarized photon structure functions $g_1^\gamma$ and $g_2^\gamma$ which can be studied in the future polarized version of ep or e$^+$e$^-$ colliders. The NLO QCD calculations of...

Zee model and phenomenology of lepton sector (2001)

We investigate the twist-3 effects in the polarized virtual photon structure. The structure functions $g_1^\gamma$ and $g_2^\gamma$ of polarized photon could be experimentally studied in the future...

Mitsuda, Eiichi, Sasaki, Ken

The virtual effects of the Zee charged scalar boson on the lepton-family-number (LFN) violating processes are studied. We obtain the constraints on the individual Yukawa coupling constants of the Zee...

Polarized and Unpolarized Structures of the Virtual Photon (2000)

Factorization Scheme and Parton Distributions in the Polarized Virtual Photon Target (2000)

We discuss the structure functions and the parton distributions in the virtual photon target, both polarized and unpolarized, beyond the leading order in QCD. We study the factorization-scheme...

Parton Distributions in the Virtual Photon Target and Factorization Scheme Dependence (2000)

We investigate spin-dependent parton distributions in the polarized virtual photon target in perturbative QCD up to the next-to-leading order (NLO). In the case $\Lambda^2 \ll P^2 \ll Q^2$, where...

Polarized Parton Distributions in the Photon and Factorization Scheme Dependence (1999)

We investigate parton distributions in the virtual photon target, both polarized and unpolarized, up to the next-leading order (NLO) in QCD. Parton distributions can be predicted completely up to...

Honeybee Queens Lay Fertilized Eggs When No Comb Cells for Oviposition Are Available (1999)

Spin-dependent parton distributions in the polarized virtual photon are investigated in QCD up to the next-to-leading order (NLO). In the case $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2$ ($-P^2$) is...

Ken Sasaki, Yoshiaki Obara

To study the causal mechanisms underlying the control of egg sex by honeybee queens (Apis mellifera), the queens were allowed to lay eggs in experimental cages without comb cells. The sex of the eggs...

Spin structure function of the virtual photon beyond the leading order in QCD (1999)

Sasaki, Ken, Uematsu, T., 佐々木, 賢, ササキ, ケン, ...

Polarized photon structure can be studied in the future polarized e(+)e(-) colliding-beam experiments. We investigate the spin-dependent structure function of the virtual photon g(1)(gamma)(x Q(2),...

Spin structure function of the virtual photon (1999)

Spin Structure Function of the Virtual Photon Beyond the Leading Order in QCD (1998)

We investigate the spin structure of the virtual photon beyond the leading order in QCD. The first moment of the virtual photon spin structure function $g_1^\gamma(x,Q^2,P^2)$ with QCD effects turns...

Polarized Virtual Photon Structure Function in the Next-to-leading Order in QCD (1998)

Polarized photon structure can be studied in the future polarized $e^{+}e^{-}$ colliding-beam experiments. We investigate the spin-dependent structure function of the virtual photon...

Spin structure function g(2)(x,Q(2)) and twist-3 operators in large-N-C QCD (1998)

The virtual photon structure function $g_1^{\gamma}(x,Q^2,P^2)$, which can be obtained in polarized $e^{+}e^{-}$ colliding-beam experiments, is investigated for $\Lambda^2 \ll P^2 \ll Q^2$, where...

Sasaki, Ken, 佐々木, 賢, ササキ, ケン

It is shown in the framework of operator product expansion and the renormalization group method that the twist-3 part of flavor nonsinglet spin structure function g(2)(x, Q(2)) obeys a simple...

Spin Structure Function g_2(x,Q^2) and Twist-3 Operators in large-N_C QCD (1998)

Gauge-independent resummed gluon self-energy in hot QCD (1996)

It is shown in the framework of the operator product expansion and the renormalization group method that the twist-3 part of flavour nonsinglet spin structure function g_2(x,Q^2) obeys a simple...

Gauge-independent Thermal $\beta$ Function In Yang-Mills Theory via the Pinch Technique (1995)

The pinch technique (PT) is applied to obtain the gauge-independent resummed gluon self-energy in a hot Yang-Mills gas. Calculation is performed at one- loop level in linear gauges which preserve...

Gauge-independent Thermal $\beta$ Function In Yang-Mills Theory (1995)

It is proposed to use the pinch technique (PT) to obtain the gauge-independent thermal $\beta$ function $\beta_T$ in a hot Yang-Mills gas. Calculations of the thermal $\beta$ function are performed...

Two-loop electroweak corrections to the $\rho$ parameter beyond the leading approximation (1995)

It is proposed to use the pinch technique (PT) to obtain the gauge-independent thermal $\beta$ function in a hot Yang-Mills gas. Calculations of the thermal $\beta$ function are performed at one-loop...

Papavassiliou, Joannis, Philippides, Kostas, Sasaki, Ken

We show that in the framework of the pinch technique the universal part of the $\rho$ parameter can be meaningfully defined, beyond one loop. The universal part so obtained satisfies the crucial...

Muonium-Antimuonium Conversion in Models with Dilepton Gauge Bosons (1995)

Horikawa, Kuninori, Sasaki, Ken

We examine the magnetic field dependence of the muonium($\mu^+ e^-$) - antimuonium($\mu^- e^+$) conversion in the models which accommodate the dilepton gauge bosons. The effective Hamiltonian for the...

More on the Burkhardt-Cottingham Sum Rule in QCD (1994)

Kodaira, Jiro, Matsuda, Satoshi, Uematsu, Tsuneo, Sasaki, Ken

The QCD higher order effects to the polarized structure function $g_2(x, Q^2 )$ are reanalyzed for massive quarks in the context of the operator product expansion. We confirm that the lowest moment...

The Background Field Method: Alternative Way of Deriving the Pinch Technique's Results (1994)

Hashimoto, Shoji, Kodaira, Jiro, Yasui, Yoshiaki, Sasaki, Ken

We show that the background field method (BFM) is a simple way of deriving the same gauge-invariant results which are obtained by the pinch technique (PT). For illustration we construct...

The Mass of the Lightest Supersymmetric Higgs Boson beyond the Leading Logarithm Approximation (1993)

Kodaira, Jiro, Yasui, Yoshiaki, Sasaki, Ken

We examine the radiative corrections to the mass of the lightest Higgs boson in the minimal supersymmetric extension of the standard model. We use the renormalization-group improved effective...

電弱SU(3)_L×U(1)_Xゲージ理論におけるダイレプトンゲージボソンI : SU(3)_L×U(1)_Xモデル (1993)

藤井, 寿, 佐々木, 賢, フジイ, ヒサシ, ササキ, ケン, Fujii, Hisashi, Sasaki, Ken, ...

電弱SU(3)_L×U(1)_Xゲージ理論におけるダイレプトンゲージボソンII : ダイレプトンによる輻射補正 (1993)

藤井, 寿, 佐々木, 賢, フジイ, ヒサシ, ササキ, ケン, Fujii, Hisashi, Sasaki, Ken, ...

Recent Progress of Metalloporphyrin-catalyzed Oxidation and Oxygenation (Commemoration Issue Dedicated to Professor Shinzaburo OKA On the Occasion of His Retirement) (1989)

Okamoto, Tadashi, Sasaki, Ken, Tachibana, Masahiko

A Simple Preparation and C atalytic Properties of Colloidal Nickel for Selective Hydrogenation (Commemoration Issue Dedicated to Professor Shinzaburo OKA On the Occasion of His Retirement) (1989)

Sakai, Mutsuji, Takai, Yoshihiro, Sasaki, Ken, Sakakibara, Yasumasa

Autolysis-Iike Release of Pectic Polysaccharides from Regions of Cell Walls Other Than the Middle Lamella (1989)

Sasaki, Ken, Nagahashi, Gerald

Cell walls of a storage organ (potato tubers) showed autolysis-like activity. After 20 h of incubation in water at 35°C, the purified cell walls released approximately 10% of the cell wall...

Specific Labeling of Cell Wall Polysaccharides with myo-[2-3H] Inositol during Germination and Growth of Phaseolus vulgaris L. (1984)

Sasaki, Ken, Taylor, Iain E. P.

myo-[2-3H]Inositol was fed to bean seeds by imbibition and its metabolic fate was studied during germination and seedling growth. The largest amount of myo-inositol was taken up from a 500 HIM supply...

Changes in Neutral Sugar Compositions of Cell Wall Polysaccharides during Redifferentiation of Cultured Carrot Cells and during Maturation of Soybean Seeds (1983)

Comparative studies of the neutral sugar composition of cell wall polysaccharides between cultured cells and mother plant tissues of soybean and carrot (1980)

Changes in the neutral sugar compositions of cell walls were studied during regeneration of shoots and roots from cultured carrot cells and during maturation of soybean seeds. There were more...

Sasaki, Ken, Maeda, Masaakira, Ohira, Koji

The cell walls obtained from cultured cells grown under various conditions and their mother plant tissues or organs were compared with regard to the neutral sugar composition of polysaccharides. In...

Redistribution of Tritium during Germination of Grain Harvested from myo-[2-3H]Inositol- and scyllo-[R-3H]Inositol-Labeled Wheat 1

Metabolism of myo-[2-3H]Inositol and scyllo-[R-3H]Inositol in Ripening Wheat Kernels 1

Wheat kernels from myo-[2-3H]inositol- or scyllo-[R-3H]inositol-labeled plants (Sasaki and Loewus 1980 Plant Physiol 66: 740-745) were used to study redistribution of 3H into growing regions during...

Use of Per-C-Deuterated myo-Inositol for Study of Cell Wall Synthesis in Germinating Beans 1

Injection of myo-[2-3H]inositol or scyllo-[R-3H]inositol into the peduncular cavity of wheat stalks about 2 to 4 weeks postanthesis led to rapid translocation into the spike and accumulation of label...

Sasaki, Ken, Nagahashi, Gerald, Gretz, Michael R., Taylor, Iain E. P.

Cell wall polysaccharides of the hypocotyl and roots in germinating beans (Phaseolus vulgaris L.) were selectively labeled in arabinosyl, xylosyl, and galacturonosyl residues by per-C-deuterated...

Enantiomeric Form of myo-Inositol-1-Phosphate Produced by myo-Inositol-1-Phosphate Synthase and myo-Inositol Kinase in Higher Plants 1

Loewus, Mary W., Sasaki, Ken, Leavitt, Alan L., Munsell, Ling, Sherman, William R., Loewus, Frank A.

The product of myo-inositol-1-phosphate synthase, EC 5.5.1.4, from mature pollen of Lilium longiflorum Thunb., cv Ace (Easter lily) and that of myo-inositol kinase, EC 2.7.1.64, from wheat germ has...

myo-Inositol Synthesis from [1-3H]Glucose in Phaseolus vulgaris L. during Early Stages of Germination 1

Sasaki, Ken, Taylor, Iain E. P.

Radiolabeled d-[1-3H]glucose was fed by imbibition under sterile conditions to bean (Phaseolus vulgaris L.) seeds. After 72 and 96 hours of feeding, the 3H was located in uronic acid and pentose...

Staged Resection of Large Hypervascular Vestibular Schwannomas in Young Adults

Abe, Takumi, Izumiyama, Hitoshi, Imaizumi, Youichi, Kobayashi, Shinsuke, Shimazu, Motohiko, Sasaki, Ken, ...

Two young adults underwent resection of large hypervascular vestibular schwannomas (acoustic neuromas) via two-stage surgery. The first patient, a 27-year-old woman with hydrocephalus, had a large...

Redistribution of Tritium during Germination of Grain Harvested from myo-[2-3H]Inositol- and scyllo-[R-3H]Inositol-Labeled Wheat 1

Metabolism of myo-[2-3H]Inositol and scyllo-[R-3H]Inositol in Ripening Wheat Kernels 1

Wheat kernels from myo-[2-3H]inositol- or scyllo-[R-3H]inositol-labeled plants (Sasaki and Loewus 1980 Plant Physiol 66: 740-745) were used to study redistribution of 3H into growing regions during...