Tomoaki Yamada

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Various undifferentiated embryonic stem (ES) cells can grow on mouse embryonic fibroblast (MEF) feeders. However, the risk of zoonosis from animal feeders to human ES cells generally excludes the clinical use of these human ES cells. We have found that human placenta is a useful source of feeder cells for the undifferentiated growth of primate ES cells. As(More)
Two extremely halophilic archaea, strains MGY-184(T) and MGY-205, were isolated from sea salt produced in Japan and rock salt imported from Bolivia, respectively. Both strains were pleomorphic, non-motile, Gram-negative and required more than 5 % (w/v) NaCl for growth, with optimum at 9-12 %, in the presence of 2 % (w/v) MgCl2 . 6H2O. In the presence of 18(More)
We succeeded in regulating the growth of diatom cells on chemically modified glass surfaces. Glass surfaces were functionalized with -CF3, -CH3, -COOH, and -NH2 groups using the technique of self-assembled monolayers (SAM), and diatom cells were subsequently cultured on these surfaces. When the samples were rinsed after the adhesion of the diatom cells on(More)
This paper aims to provide a quantitative analysis of the influence of an aging population on the financing of Japan’s universal health insurance system and potential reform policies. We construct a general equilibrium life-cycle model to study the effects of aging on the tax burden, individual behaviors, the aggregate economy, and welfare. We also evaluate(More)
In this paper, we explore whether markets can create endogenously good collateral in a crisis by analyzing a simple model where a country-specific catastrophic shock is shared between two countries in the presence of solvency constraints. In this model, due to severe solvency constraints, realized catastrophic shocks cannot be covered fully by ex ante(More)
This paper is aimed at providing a quantitative analysis of the impact of population aging in Japan on financing its universal health insurance system and potential reform policies. We construct a general equilibrium life cycle economy that is used to study the impact of an aging population on household’s work and savings behavior, as well as on aggregate(More)
This paper clarifies the effects of pension benefit systems on aggregate hours worked. By incorporating the labor income taxes and the social security taxes into a representative agent model, previous studies successfully explain the long term decline in the hours worked in some continental European countries, and the differences between these European(More)
Having low income is one of the requirements for Medicaid eligibility. Given that earning ability is unobservable, once an individual with high labor income stops working it is impossible to distinguish him from those whose potential labor income is low. This can affect the ability of Medicaid to target the most disadvantaged people given that a large(More)
This paper evaluates the role of the first arrow of Abenomics in guiding public perceptions on monetary policy stance through the management of expectations. In order to end chronic deflation, a policy regime change must be perceived by economic agents. Analysis using the QUICK survey system (QSS) monthly survey data shows that the reaction of monetary(More)