Yokkaichi, Japan
Yokkaichi, Japan

Yokkaichi University is a private university in Yokkaichi, Mie, Japan. The predecessor of the school, women's school, was founded in 1946, and it was chartered as a university in 1988. Wikipedia.


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Guo P.,Yokkaichi University | Guo P.,Mie University | Piao F.,Dalian Medical University | Sakai K.,Nagoya City Public Health Research Institute | And 3 more authors.
International Journal of Environmental Research and Public Health | Year: 2013

This study assessed subjective symptoms related to indoor concentrations of chemicals among residents in a housing estate in Dalian, China, where indoor air pollution by interior decoration materials has recently become a major health problem. Fifty-nine males and 50 females were surveyed for their symptoms related to sick building syndrome. Formaldehyde (HCHO), NO.2, and volatile organic compounds (VOCs) in their dwellings were collected using a diffusion sampler and measured by GC/MS. For residents with one or more symptoms in the past, HCHO, butanol or 1,2-dichloroethane concentrations were significantly greater in their bedrooms or kitchens compared with those of subjects without previous symptoms. For residents with one or more symptoms at the time of the study, 1,1,1-trichloroethane, xylene, butanol, methyl isobutyl ketone, and styrene concentrations in their bedrooms or kitchens were significantly greater compared with those of residents without symptoms. HCHO, NO.2, and VOCs were detected in all rooms, but their levels were lower than the guideline values except for HCHO in two rooms. Chemical substances from interior decoration materials at indoor air levels lower than their guideline values might have affected the health status of residents.


Sakai Y.,Kogakuin University | Nakano S.,Keio University | Wang C.,Tianjin University of Science and Technology | Kito H.,Yokkaichi University
Journal of Chemical Engineering of Japan | Year: 2015

Environmental and health problems due to sulfur dioxide (SO2) emission are serious issues in China. In this study, we developed a model to assess the total economic and environmental impact on an area subsequent to installation of desulfurization facilities. A model based on the number of new patients with respiratory illness in Shenyang City, China and the corresponding environmental SO2 concentration was first constructed and subsequently integrated into an air diffusion model for SO2. Changes in the SO2 concentration and the number of patients were then simulated, and the effects of desulfurization by-products on salt-affected soil amelioration were assessed in a number of scenarios where desulfurization facilities were installed in combustion plants. From the data, it is projected that the introduction of a wet limestone– gypsum process in large plants, an integrated desulfurization and water-film dust collection process in medium- and small-scale plants, and coal bio-briquettes in households should result in SO2 concentrations below the stipulated SO2 limit for urban residential areas in China. Moreover, a large decrease in the number of new patients and in the total number of patients at the year-end was forecasted for the years following the introduction of these facilities. Additionally, the present findings indicate that amelioration of salt-affected soil using desulfurization by-products is a prospectively effective method for increasing corn and rice production for potential alleviation of food shortages in China. © 2015 The Society of Chemical Engineers, Japan.


Sakai Y.,Kogakuin University | Nakano S.,Keio University | Kito H.,Yokkaichi University
Journal of Chemical Engineering of Japan | Year: 2011

With the aim of alleviating the problems of air pollution, soil desertification, and food shortages in China, we have studied the impact of reclamation of alkali soil using the by-products of flue gas desulfurization (FGD). We have developed an evaluation model for assessing the complete economic and environmental impact of the introduction of environmental improvement technologies. The model consists of an economic model based on an input-output table for China and a soil reclamation model. In the context of the introduction of FGD equipment, we are able to calculate the associated changes in economic variables such as real GDP, average wage, labor supply, domestic electricity price, real investment other than for desulfurization equipment, investment in construction, SO2 emissions in provinces and cities, area of reclaimed alkali soil, and corn and rice production. We simulated the introduction of the wet limestone-gypsum process and/or the integrated desulfurization and water-film dust collection process. The results confirm a reduction in SO2 emissions and increases in GDP, domestic electricity price, and agricultural production following soil reclamation via the application of desulfurization by-products. In summary, our results confirm the effectiveness of these desulfurization technologies in terms of improving the economy and environment in China. © 2011 The Society of Chemical Engineers, Japan.


Haraguchi K.,Hiroshima University | Yamamoto T.,Hiroshima University | Chiba S.,Yokkaichi University | Shimizu Y.,Fisheries Research Institute | Nagao M.,Japan National Institute of Advanced Industrial Science and Technology
Estuarine, Coastal and Shelf Science | Year: 2010

In this paper, oxygen budget was estimated for the lower layer of water column in a semi-enclosed bay, Ago Bay, Japan. Benthic oxygen consumption rates were measured directly with an in situ measurement device from 13 July to 16 August 2004. Oxygen budget was calculated based on physical, chemical and biological processes using the observed data. Along with the change of the water column structure at the time of a hit of typhoon, dominant phytoplankton species shifted from the diatom Skeletonema costatum to the dinoflagellate Heterocapsa circularisquama. During the diatom-dominating period, oxygen supply rate in the lower layer due to photosynthesis was comparable to or slightly lower than the sediment oxygen consumption rate. In contrast, during the dominance of the dinoflagellate, net oxygen budget was significantly negative in the lower layer while it was positive in the upper layer. This could be attributed to the migration behavior of the dominant dinoflagellate H. circularisquama that swim up to the upper layer and produce oxygen in daytime, and swim down to the lower layer and consume oxygen in nighttime. The results of the present study suggest that phytoplankton migration behavior can enhance the development of oxygen depleted water mass in the lower layer of eutrophic shallow coastal seas. © 2009 Elsevier Ltd. All rights reserved.


Makita N.,Yokkaichi University | Yoshikawa Y.,Ritsumeikan University | Takenaka Y.,RIKEN | Sakaue T.,Kyushu University | And 7 more authors.
Journal of Physical Chemistry B | Year: 2011

We observed single DNA molecules by fluorescence microscopy to clarify the effect of protamine on their higher-order structure. With an increase in the protamine concentration, the conformation of DNA molecules changes from an elongated coil state to a compact state through an intermediate state. Furthermore, the long-axis length of DNA gradually decreases while maintaining a distribution profile with a single peak. Such behavior is markedly different from the conformational transition of DNA induced by small polyamines such as spermidine and spermine, where individual DNA molecules exhibit an all-or-none transition from a coil to a globule state and the size distribution is characterized by twin peaks around the transition region. Next, we examined the effect of salt on the conformation of the DNA-protamine complex. Interestingly, at a fixed concentration of protamine, DNA tends to shrink with an increase in the NaCl concentration up to 300 mM, and then swells with a further increase in the NaCl concentration, that is, biphasic behavior is generated depending on the salt concentration. For comparison, we examined the effect of salt on DNA compaction induced by the trivalent polyamine spermidine. We confirmed that salt always has an inhibitory effect on spermine-induced compaction. To clarify this biphasic effect of salt on protamine-induced DNA compaction, we performed a numerical simulation on a negatively charged semiflexible polyelectrolyte in the presence of polycations with relatively large numbers of positive charges by taking into account the effect of salt at different concentrations. The results showed that salt promotes compaction up to a certain concentration and then tends to unfold the polyelectrolyte chain, which reproduced the experimental observation in a semiquantitative manner. This biphasic effect is discussed in relation to the specific shielding effect that depends on the salt concentration. © 2011 American Chemical Society.


Yoshikawa K.,Kyoto University | Hirota S.,Kyoto University | Makita N.,Yokkaichi University | Yoshikawa Y.,Ritsumeikan University
Journal of Physical Chemistry Letters | Year: 2010

We observed the collapsing transition of a DNA molecule in a crowding environment with a water-soluble negatively charged protein, albumin. We performed fluorescence microscopic observation to monitor the change in the conformation of individual giant DNA molecules. It is found that DNA molecules exhibit compact conformation above critical concentrations of the negatively charged protein. We interpret this transition in terms of depletion interaction, segregation of different polymers driven by excluded volume interaction. Interestingly, coexisting salt causes retardation on the collapsing transition, being opposite to the well-known phenomenon of DNA compaction in a crowding solution of neutral polymer, polymer-salt-induced-condensation of DNA (psi-condensation). The possible biological significance of the transition of higher-order structure on DNA in a concentrated protein solution is discussed in relation to the highly crowded conditions in living cells. © 2010 American Chemical Society.


Krotova M.K.,Moscow State University | Vasilevskaya V.V.,Russian Academy of Sciences | Makita N.,Yokkaichi University | Yoshikawa K.,Kyoto University | Khokhlov A.R.,Russian Academy of Sciences
Physical Review Letters | Year: 2010

We studied the conformational properties of DNA in a salt solution of the strongly charged protein bovine serum albumin. DNA is compacted when a suitable amount of bovine serum albumin is added to the solution due to a crowding effect and strong electrostatic repulsion between DNA and bovine serum albumin, both of which carry negative charges. However, DNA undergoes an unfolding transition with an increase in the salt concentration. This observation contradicts the current understanding of polymer- and salt-induced condensation, ψ condensation. We propose a simple theoretical model by taking into account the competition between the translational entropy of ions and electrostatic interaction. © 2010 The American Physical Society.


Suda H.,Aichi Institute of Technology | Tanaka M.,Yokkaichi University | Nobori M.,Aichi Institute of Technology | Yagi A.,Aichi Institute of Technology
International Journal of GEOMATE | Year: 2016

Lake Fukami-ike is a small monomictic and eutrophic lake, located in southern Nagano Prefecture in Central Japan. An uncommon phenomenon of dissolved oxygen 0-1 mgL-1 from the surface to the bottom layer occurred on 16 November, 2013. On November 2, Trichocerca similis (Rotatoria) etc. dominantly distributed from 0-5 m depth depending on distribution DO concentration. Tintinnopsis lacustris (Protozoa) was found in the bottom layer (anoxic condition). The number of cells (Fragilaria rumpens (Bacillariophyceae) etc. abounded from the 0-5 m layer. On November 16, T. lacustris distributed from the surface to the bottom layer. Then, T. lacustris continued to distribute from the surface to the bottom layer, and the genus Synedra was found to have distributed uniformly from the surface to 6 m depth in the next investigation on 21 December, when the DO concentration was about 10 mgL-1 from the surface to the bottom layer. The changes in vertical distribution of T. lacustris, seemed to indicate that lake water was lifted from the bottom layer when shift stagnation periods to circulation periods. © 2015, Int. J. of GEOMATE. All rights reserved.


Kaneko K.,Yokkaichi University
Journal of Nonlinear Mathematical Physics | Year: 2014

We have classified symmetric solutions around the origin to the four dimensional degenerate Painlevé type equation NYA 4 with generic values of parameters. We obtained sixteen meromorphic solutions, which are transformed each other by the Bäcklund transformation. We calculated the linear monodromy for one of them, explicitly. © 2014 Copyright: the authors.


PubMed | Yokkaichi University
Type: Journal Article | Journal: The journal of physical chemistry. B | Year: 2011

We observed single DNA molecules by fluorescence microscopy to clarify the effect of protamine on their higher-order structure. With an increase in the protamine concentration, the conformation of DNA molecules changes from an elongated coil state to a compact state through an intermediate state. Furthermore, the long-axis length of DNA gradually decreases while maintaining a distribution profile with a single peak. Such behavior is markedly different from the conformational transition of DNA induced by small polyamines such as spermidine and spermine, where individual DNA molecules exhibit an all-or-none transition from a coil to a globule state and the size distribution is characterized by twin peaks around the transition region. Next, we examined the effect of salt on the conformation of the DNA-protamine complex. Interestingly, at a fixed concentration of protamine, DNA tends to shrink with an increase in the NaCl concentration up to 300 mM, and then swells with a further increase in the NaCl concentration, that is, biphasic behavior is generated depending on the salt concentration. For comparison, we examined the effect of salt on DNA compaction induced by the trivalent polyamine spermidine. We confirmed that salt always has an inhibitory effect on spermine-induced compaction. To clarify this biphasic effect of salt on protamine-induced DNA compaction, we performed a numerical simulation on a negatively charged semiflexible polyelectrolyte in the presence of polycations with relatively large numbers of positive charges by taking into account the effect of salt at different concentrations. The results showed that salt promotes compaction up to a certain concentration and then tends to unfold the polyelectrolyte chain, which reproduced the experimental observation in a semiquantitative manner. This biphasic effect is discussed in relation to the specific shielding effect that depends on the salt concentration.

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