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Search Results: 1 - 10 of 227 matches for " KATSUYUKI HAMASAKI "
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Phospholipids Effect on Survival and Molting Synchronicity of Larvae Mud Crab Scylla serrata
HAYATI Journal of Biosciences , 2012,
Abstract: Effect of phospholipids on survival and molting synchronicity of mud crab larvae Scylla serrata were examined using Artemia enriched with five treatments of emulsion oil i.e. treatment with different level of soybean lecithin (SL) together with a level of DHA70G (referred to as DHA-SL0, 20 and 40) and treatment with SL and cuttle fish phospholipids (CPL) at 40 uL/L without DHA70G (referred to as WDHA-SL and WDHA-CPL). Survival rate, intermolt period, carapace width, and molting synchronicity were evaluated. Additionally, lipid classes and fatty acid composition of enriched Artemia were analyzed. Survival rate, intermolt period, and carapace width at the first crab (FC) stage of mud crab larvae fed DHA-SL0 to 40 were similar to that of WDHA-CPL but higher than that of WDHA-SL (P < 0.05). Moreover, mud crab larvae fed DHA-SL20, DHA-SL40, and WDHA-CPL had a significantly higher molting synchronicity index compared to that of larvae fed WDHA-SL and DHA-SL0. It can be concluded that combination of phospholipids and essential fatty acids exhibited an additive effect in improving molting synchronicity of mud crab larvae.
Cholesterol Effect on Survival and Development of Larval Mud Crab Scylla serrata
HAYATI Journal of Biosciences , 2012,
Abstract: The effect of cholesterol on the survival and development of larval mud crab Scylla serrata were examined by feeding larvae with Artemia enriched with different level of cholesterol. Artemia enriched with four stated levels of cholesterol i.e., 0, 5, 10, and 20 ul/l (Chol 0, 5, 10, and 20). All treatments were mixed with DHA70G at 25 ul/l. All the oil was adjusted to 100 ul/l by adding the oleic acid. Survival rate, intermolt period, and carapace width at the fisrt crab stage of mud crab larvae fed Chol 0, 5, and 10 were higher compared to that of Chol 20 (P < 0.05). We suggest that free sterol contained in Artemia at 1.37% was harmful to the growth performance of mud crab larvae. This study suggests that mud crab larvae required at least 0.61% cholesterol for maintaining good survival and development and therefore no need to enrich Artemia by cholesterol for the practical purpose.
The Effects of Income Inequality on Education Policy and Economic Growth  [PDF]
Katsuyuki Naito, Keigo Nishida
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.21020
Abstract: This paper presents a simple model to investigate the relationship among initial income inequality, education and eco- nomic growth. Public expenditure on education is determined through majority voting. Although preferences of individuals are not single-peaked, the individual with the median income becomes the decisive voter. Our model predicts that high initial inequality has a negative impact on education expenditure and therefore retards economic growth.
Formalism of Nonequilibrium Perturbation Theory and Kondo Effect
Mami Hamasaki
Physics , 2008,
Abstract: The formalism of nonequilibrium perturbation theory was constructed by Schwinger and Keldysh and then was developed with the diagrammatical technique by Lifshitz and Pitaevskii. Until now there has been widespread application to various researches in physics, condensed matter, plasmas, atoms and molecules, nuclear matter etc.. In spite of this, the formalism has not been established as perturbation theory. For example, there is no perturbative method to derive arbitrary self-energy properly. In addition, the connection with other formalism, e.g., the Matsubara imaginary-time perturbative formalism is uncertain. Although there must be the relationship between self-energies in the perturbative formalism, such basic problems remain to be solved. The solution is given by the present work. The real-time perturbative expansion is performed on the basis of the adiabatic theorem. As the results, the requirements of self-energies as functions in time are demonstrated and the formulated self-energies meet the known relations. Besides, it gives exact agreement with functions derived by perturbative expansion in imaginary-time and analytical continuity. As a consequence, it implies that the present formalism can be generalized.
Effect of Electron Correlation on Current and Current Noise for the Single- and Two-Impurity Anderson Model
Mami Hamasaki
Physics , 2002, DOI: 10.1103/PhysRevB.69.115313
Abstract: The paper has been withdrawn. The revised paper has been published in Phys. Rev. B 69, 115313 (2004).
Nonequilibrium Perturbative Formalism and Spectral Function for the Anderson Model
Mami Hamasaki
Physics , 2005,
Abstract: The present work is based on the nonequilibrium perturbative formalism. There the self-energies are derived up to the forth-order. In consequence, it proves that the nonequilibrium (real-time) perturbative expansion can be connected with the Matsubara imaginary-time perturbative expansion for equilibrium. As the numerical results, the Kondo resonance still disappears for bias voltage exceeding the Kondo temperatures, as observed in experiments of two terminal systems.
Spectral Function for the Anderson Model based on Nonequilibrium Perturbation Theory
Mami Hamasaki
Physics , 2004,
Abstract: The paper has been withdrawn. The revised version is shown as cond-mat/0506752 and published in Condensed Matter Physics, vol.10, No.2(50)235-248(2007) (Lviv, Ukraine).
An in vitro monocyte culture method and establishment of a human monocytic cell line (K63)
Katsuyuki Kadoi
Veterinaria Italiana , 2011,
Abstract: A novel method of monocyte culture in vitro was developed. The fraction of monocytes was obtained by density centrifugation of heparinised human venous blood samples. Monocytes were suspended in a modified Rosewell Park Memorial Institute medium (RPMI)-1640 (mRPMI) supplemented with 10% non-inactivated autologous serum added to the feeder cells. An avian cell line was used for feeder cells. Only those monocytes that settled on feeder cells grew rapidly at 37°C-38°C into a formation of clumped masses within two to three days. The cell mass was harvested and subcultures were made without feeder cells. A stable cell line (K63) was established from subcultures using a limited dilution method and cell cloning in microplates. K63 cells were adapted for later growth in the mRPMI medium supplemented with 10% foetal calf serum. The cells were well maintained at over 50th passage levels. This method proved to be applicable for monocyte cultures of animals as well.
Review: Plasma-enhanced chemical vapor deposition of nanocrystalline diamond
Katsuyuki Okada
Science and Technology of Advanced Materials , 2007,
Abstract: Nanocrystalline diamond films have attracted considerable attention because they have a low coefficient of friction and a low electron emission threshold voltage. In this paper, the author reviews the plasma-enhanced chemical vapor deposition (PE-CVD) of nanocrystalline diamond and mainly focuses on the growth of nanocrystalline diamond by low-pressure PE-CVD. Nanocrystalline diamond particles of 200–700 nm diameter have been prepared in a 13.56 MHz low-pressure inductively coupled CH4/CO/H2 plasma. The bonding state of carbon atoms was investigated by ultraviolet-excited Raman spectroscopy. Electron energy loss spectroscopy identified sp2-bonded carbons around the 20–50 nm subgrains of nanocrystalline diamond particles. Plasma diagnostics using a Langmuir probe and the comparison with plasma simulation are also reviewed. The electron energy distribution functions are discussed by considering different inelastic interaction channels between electrons and heavy particles in a molecular CH4/H2 plasma.
Genus One Partition Function of the Calabi-Yau d-Fold embedded in ${CP^{d+1}}$
Katsuyuki Sugiyama
Physics , 1995,
Abstract: For a one-parameter family of Calabi-Yau d-fold M embedded in ${{CP}^{d+1}}$, we consider a new quasi-topological field theory ${A^{\ast}}$(M)-model compared with the $A$(M)-model. The two point correlators on the sigma model moduli space (the hermitian metrics) are analyzed by the $A{A^{\ast}}$-fusion on the world sheet sphere. A set of equations of these correlators turns out to be a non-affine A-type Toda equation system for the d-fold M. This non-affine property originates in the vanishing first Chern class of M. Using the results of the $A{A^{\ast}}$-equation, we obtain a genus one partition function of the sigma model associated to the M in the recipe of the holomorphic anomaly. By taking an asymmetrical limit of the complexified {\kae} parameters ${\bar{t}\rightarrow \infty}$ and $t$ is fixed, the ${A^{\ast}}$(M)-model part is decoupled and we can obtain a partition function (or one point function of the operator ${{\cal O}^{(1)}}$ associated to a {\kae} form of M) of the $A$(M)-matter coupled with the topological gravity at the stringy one loop level. The coefficients of the series expansion with respect to an indeterminate $q:={e^{2\pi i t}}$ are integrals of the top Chern class of the vector bundle {\Large $\nu $} over the moduli space of stable maps with definite degrees.
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