Sawako Imahiro

Bio: Sawako Imahiro is an academic researcher from Tohoku University. The author has contributed to research in topics: Quercus serrata & Raffaelea quercivora. The author has an hindex of 2, co-authored 2 publications receiving 193 citations.

Atomic Data and Nuclear Data Tables

Abstract: a b s t r a c t The ab initio quasirelativistic Hartree–Fock method developed specifically for the calculation of spectral parameters of heavy atoms and highly charged ions is used to derive transition data for a multicharged tungsten ion. The configuration interaction method is applied to include electron correlation effects. The relativistic effects are taken into account in the Breit–Pauli approximation for quasirelativistic Hartree–Fock radial orbitals. The energy level spectra, radiative lifetimes and Lande gfactors are calculated for the 4p 6 4d 2 , 4p 6 4d4f, and 4p 5 4d 3 configurations of the ion W 36+ . The transition wavelengths, spontaneous transition probabilities, oscillator strengths, and line strengths for the electric dipole, electric quadrupole, electric octupole, and magnetic dipole transitions among the levels of these configurations are tabulated.

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Abstract: The present work introduces an origin of sensing function of polyelectrolyte-coated colloids based onTb(III) complexes with calix[4]resorcinarene cavitand bearing four 1,3-diketone groups at the upperrim. The Tb(III)-centered luminescence of the colloids remains unchanged at pH 3–9, although theTb(III) complexes are highly pH-dependent in DMF solutions. Both colloidal and luminescent proper-ties of the colloids are stable within one month at least, which reveals stability of complex-based hardnanotemplates and soft polyelectrolyte deposition. The chelating substrates (catechol, tetracycline andfluoroquinolone derivatives)inducequickandreproducibleluminescentresponseofthecomplex-basedcolloids without any detectable changes of their colloidal properties. The ternary complex formation atthe interface of the colloids is the reason for their luminescent response on the substrates in aqueoussolutions. BoththeinsolubilityoftheTb(III)-containingcoresandtheshieldingand/orbuffereffectofthepolyelectrolyte coating affect the interfacial complex formation, which results in more selective lumi-nescent response of the colloids on the tetracycline and fluoroquinolone antibiotics in comparison withthe complexes in solutions.© 2015 Elsevier B.V. All rights reserved.

Mutation research/fundamental and molecular mechanisms of mutagenesis: special issue: DNA repair and genetic instability.

Abstract: Ionizing radiation (IR) induces DNA strand breaks leading to cell death or deleterious genome rearrangements. In the present study, we examined the role of N-acetyl-L-cysteine (NAC), a clinically proven safe agent, for it’s ability to protect against -ray-induced DNA strand breaks and/or DNA deletions in yeast andmammals. In the yeast Saccharomyces cerevisiae, DNA deletions were scored by reversion to histidine prototrophy. Human lymphoblastoid cells were examined for the frequency of -H2AX foci formation, indicative of DNA double strand break formation. DNA strand breaks were also measured in mouse peripheral blood by the alkaline comet assay. In yeast, NAC reduced the frequency of IR-induced DNA deletions. However, NAC did not protect against cell death. NAC also reduced -H2AX foci formation in human lymphoblastoid cells but had no protective effect in the colony survival assay. NAC administration via drinking water fully protected against DNA strand breaks in mice whole-body irradiated with 1Gy but not with 4Gy. NAC treatment in the absence of irradiation was not genotoxic. These data suggest that, given the safety and efficacy of NAC in humans, NAC may be useful in radiation therapy to prevent radiation-mediated genotoxicity, but does not interfere with efficient cancer cell killing. © 2009 Published by Elsevier B.V.

Microporous and Mesoporous Materials

Abstract: Ion exchange of nanoporous (e.g., zeolite) membranes is of increasing importance in their applications as separation devices and catalytic reactors. Ion exchange processes in zeolite membranes are significantly limited by slow hydrated-ion transport rates and the low liquid-solid interfacial area available in com- parison to ion exchange of zeolites in powdered form, thereby leading to long membrane processing and regeneration times. Here, we consider ion exchange processes in zeolite membranes in more detail, and show the much higher efficacy of a vacuum-assisted liquid-vapor 'flow-through' method in compar- ison to both the conventional 'immersion/counter-diffusion' method as well as a liquid-liquid flow- through method. Na-MFI zeolite disk membranes, made by both in situ and seeded growth, were ion- exchanged with Ga 3+ ,Z n 2+ , and Pt 2+ ions in the temperature range of 23-70 C and exchange times of 5-24 h. The penetration of these ions into the zeolite membranes was investigated in detail by energy- dispersive X-ray (EDX) spectroscopy. Surprisingly, the quantity of exchanged ions in the membranes via the vacuum-assisted 'flow-through' technique is found to exceed that achieved by the other two methods by up to a factor of ten, with the liquid-liquid technique being the least efficient. Higher tem- peratures and longer ion exchange times increased the ion exchange efficiency in the vacuum-assisted method. Chemical analysis of the condensed permeate solution by inductively-coupled plasma (ICP) mass spectrometry revealed that both the original Na

Accounting, Organizations and Society

Abstract: This study discusses the challenges and opportunities of establishing causal inference in empirical archival financial accounting research. Causal inference requires identification of a theoretically predicted causal mechanism in a research setting optimized to avoid endogenous causes and using a suitable statistical inference strategy. After briefly describing potential research design strategies, I analyze the frequency of causal studies published in leading business and economics journals. I identify causal studies by their abstract including an explicit reference to their causal nature and find that they are significantly more common in the areas of economics and finance compared to other business-oriented research disciplines like accounting. Also, the extent to which research designs are optimized for causal inference differs significantly between causal empirical archival studies in the area of financial accounting and finance. I discuss potential reasons for this gap and make some suggestions on how the demand for and supply of well-designed causal studies in the area of empirical archival financial accounting research might be increased. 2013 Elsevier Ltd. All rights reserved.