Satsumasendai, Japan

Miyagi University of Education
Satsumasendai, Japan

Miyagi University of Education, or MUE is a national university at Sendai, Miyagi, Japan. The predecessor of the school was founded in 1873, and it was chartered as a university in 1965. It is accredited by the Japanese Ministry of Education, as a public co-educational institute and is ranked in Japan's first tier of leading schools. With four academic divisions, MUE offers not only degrees in Education, but also in the disciplines of Language and Social Science, Science, Math and Life, and Art and Physical Education. Their Development and Education division covers Pre-School, Children and Culture, Pedagogy, and Educational Psychology. There are specific academic tracks for Elementary, Secondary, and Special Needs Education, and many of Miyagi University of Education’s graduates go on to become Principals at schools throughout Japan. Wikipedia.

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Fukuda Y.,Miyagi University of Education | Moriyama S.,University of Tokyo | Ogawa I.,University of Fukui
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2013

An organic liquid scintillator containing a zirconium complex has been developed for a new neutrinoless double beta decay experiment. In order to produce a detector that has good energy resolution (4% at 2.5 MeV) and low background (0.1counts/(t·year)) and that can monitor tons of target isotope, we chose a zirconium β-diketone complex having high solubility (over 10 wt%) in anisole. However, the absorption peak of the diketone ligand overlaps with the luminescence of anisole. Therefore, the light yield of the liquid scintillator decreases in proportion to the concentration of the complex. To avoid this problem, we synthesized a β-keto ester complex introducing -OC3H7 or -OC2H5 substituent groups in the β-diketone ligand, which shifted the absorption peak to around 245 nm, which is shorter than the emission peak of anisole (275 nm). However, the shift of the absorption peak depends on the polarity of the scintillation solvent. Therefore we must choose a low polarity solvent for the liquid scintillator. We also synthesized a Zr-ODZ complex, which has a high quantum yield (30%) and good emission wavelength (425 nm) with a solubility 5 wt% in benzonitrile. However, the absorption peak of the Zr-ODZ complex was around 240 nm. Therefore, it is better to use the scintillation solvent which has shorter luminescence wavelength than that of the aromatic solvent.© 2013 Published by Elsevier B.V.

Nakano T.,Tohoku University | Deguchi R.,Miyagi University of Education | Kyozuka K.,Tohoku University
Biochemical and Biophysical Research Communications | Year: 2014

Fertilization is such a universal and indispensable step in sexual reproduction, but a high degree of variability exists in the way it takes place in the animal kingdom. As discussed in other reviews in this issue, recent works on this subject clarified many points. However, important results on the mechanisms of fertilization are obtained mainly from a few restricted model organisms. In this sense, it is utterly important to collect more information from various phyla. In this review, we have re-introduced Annelida as one of the most suitable models for the analysis of fertilization process. We have briefly reviewed the historical works on the fertilization of Annelida. Then, we have described recent findings on the two independent Ca2+ increases in the fertilized eggs of Annelida, which arise from two different mechanisms and may have distinct physiological roles toward sperm entry and egg activation. We propose that the Ca2+ increase in the fertilized eggs reflect the specific needs of the zygote in a given species. © 2014 Elsevier Inc. All rights reserved.

Koizumi Y.,Tohoku University | Hara Y.,Tohoku University | Yazaki Y.,Japan National Institute of Agrobiological Science | Sakano K.,Japan National Institute of Agrobiological Science | Ishizawa K.,Miyagi University of Education
New Phytologist | Year: 2011

Pondweed (Potamogeton distinctus) turions can elongate in the absence of O2. Alcoholic fermentation serves to produce energy for anoxic elongation via the breakdown of starch stored in cells. However, the mechanism of cell growth during anoxic elongation is not fully understood. Changes in pH, H+ equivalent and lactate content of the incubation medium were measured during anoxic elongation. The effects of fusicoccin (FC), indole-3-acetic acid (IAA), vanadate, erythrosine B and K+ channel blockers on anoxic elongation were examined. Cytoplasmic pH and vacuolar pH were measured by 31P nuclear magnetic resonance (NMR) spectroscopy. Acidification of the incubation medium occurred during anoxic elongation. The contribution of CO2 and lactic acid was not sufficient to explain the acidification. FC and IAA enhanced the elongation of stem segments. Vanadate and erythrosine B inhibited anoxic elongation. Acid growth of notched segments was observed. The activity of plasma membrane H+-ATPase extracted from pondweed turions was increased slightly in anoxic conditions, but that from pea epicotyls sensitive to anoxic conditions was decreased by incubation in anoxic conditions. Both the cytoplasmic pH and vacuolar pH of pondweed turion cells chased by 32P NMR spectroscopy were stabilized during a short period <3h after anoxic conditions. We propose that the enhancement of H+ extrusion by anoxic conditions induces acidification in the apoplast and may contribute to the stabilization of pH in the cytoplasm. © 2011 The Authors. New Phytologist © 2011 New Phytologist Trust.

Jassey V.E.J.,University of Franche Comte | Shimano S.,Miyagi University of Education | Dupuy C.,CNRS Coastal and Marine Environment Laboratory | Toussaint M.-L.,University of Franche Comte | Gilbert D.,University of Franche Comte
Protist | Year: 2012

Population dynamics and feeding habits of the testate amoebae Nebela tincta and Hyalosphenia papilio were studied along a short " fen" to " bog" gradient in a Sphagnum-dominated mire (Jura, France). Samples were collected in living " top segments" (0-3cm) and early declining " bottom segments" (3-6cm) of Sphagnum fallax peat. Observations of digestive vacuole content and stable isotope analyses ( 13C and 15N) were used to establish the feeding behavior of both testate amoeba species. Owing to their vertical distribution, the feeding habit of H. papilio was described from top segments, and that of N. tincta from bottom segments. Among identified food sources, those most frequently ingested by N. tincta were spores and mycelia of fungi (55%), microalgae (25%) and cyanobacteria (8.5%). For H. papilio, the most frequently ingested prey were ciliates (55%) and microalgae (35%). Nonmetric Multidimensional Scaling analysis clearly demonstrated that the two species did not have the same feeding habit along the " fen-bog" gradient, and furthermore that a significant spatial split exists in the feeding behavior of H. papilio. Additionally, isotope analyses suggested that H. papilio and N. tincta did not have the same trophic position in the microbial food web, probably resulting from their different feeding strategies. © 2011 Elsevier GmbH.

Munakata A.,Miyagi University of Education | Kobayashi M.,International Christian University
General and Comparative Endocrinology | Year: 2010

Sexual behavior is one of the most profound events during the life cycle of animals that reproduce sexually. After completion of gonadal development that is mediated by various hormones, oviparous teleosts perform a suite of behaviors, often termed as spawning behavior. This is particularly important for teleosts that have their gametes fertilized externally as the behavior patterns ensures the close proximity of both sexes for gamete release, fusion and ultimately the production of offspring. As in other vertebrates, sexual behavior of fish is also under the control of hormones. Testicular androgen is a requirement for male sexual behavior to occur in most fish species that have been studied. Unlike tetrapods, however, ovarian estrogen does not appear to be essential for the occurrence of female sexual behavior for fish that have their gametes fertilized externally. Prostaglandins produced in the ovary after ovulation act as a trigger in some teleosts to induce female sexual behavior. Potentiating effects of gonadotropin-releasing hormone in the brain on sexual behavior are reported in some species. Under endocrine regulation, male and female fish exhibit gender-typical behavior during spawning, but in some fish species there is also some plasticity in their sexual behavior. Sex changing fish can perform both male-typical and female-typical sexual behaviors during their lifetime and this sexual plasticity can also be observed in non-sex changing fish when undergoing hormonal treatment. Although the neuroanatomical basis is not clear in fish, results of field and laboratory observations suggest that some teleosts possess a sexually bipotential brain which can regulate two types of behaviors unlike most other vertebrates which have a discrete sex differentiation of their brain and can only perform gender-typical sexual behavior. © 2009 Elsevier Inc. All rights reserved.

Deguchi R.,Miyagi University of Education | Takeda N.,Tokyo Institute of Technology | Stricker S.A.,University of New Mexico
Molecular Reproduction and Development | Year: 2011

During maturation, oocytes must undergo a process of nuclear disassembly, or "germinal vesicle breakdown" (GVBD), that is regulated by signaling pathways involving cyclic AMP (cAMP). In vertebrate and starfish oocytes, cAMP elevation typically prevents GVBD. Alternatively, increased concentrations of intra-oocytic cAMP trigger, rather than inhibit, GVBD in several groups of marine invertebrates. To integrate what is known about the stimulation of GVBD by intra-oocytic cAMP, this article reviews published data for ascidian, bivalve, brittle star, jellyfish, and nemertean oocytes. The bulk of the review concentrates on the three most intensively analyzed groups known to display cAMP-induced GVBD-nemerteans, ascidians, and jellyfish. In addition, this synopsis also presents some previously unpublished findings regarding the stimulatory effects of intra-oocytic cAMP on GVBD in jellyfish and the annelid worm Pseudopotamilla occelata. Finally, factors that may account for the currently known distribution of cAMP-induced GVBD across animal groups are discussed. © 2011 Wiley Periodicals, Inc.

Kashir J.,University of Oxford | Deguchi R.,Miyagi University of Education | Jones C.,University of Oxford | Coward K.,University of Oxford | Stricker S.A.,University of New Mexico
Molecular Reproduction and Development | Year: 2013

Fertilization causes mature oocytes or eggs to increase their concentrations of intracellular calcium ions (Ca2+) in all animals that have been examined, and such Ca2+ elevations, in turn, provide key activating signals that are required for non-parthenogenetic development. Several lines of evidence indicate that the Ca2+ transients produced during fertilization in mammals and other taxa are triggered by soluble factors that sperm deliver into oocytes after gamete fusion. Thus, for a broad-based analysis of Ca2+ dynamics during fertilization in animals, this article begins by summarizing data on soluble sperm factors in non-mammalian species, and subsequently reviews various topics related to a sperm-specific phospholipase C, called PLCζ, which is believed to be the predominant activator of mammalian oocytes. After characterizing initiation processes that involve sperm factors or alternative triggering mechanisms, the spatiotemporal patterns of Ca2+ signals in fertilized oocytes or eggs are compared in a taxon-by-taxon manner, and broadly classified as either a single major transient or a series of repetitive oscillations. Both solitary and oscillatory types of fertilization-induced Ca2+ signals are typically propagated as global waves that depend on Ca2+ release from the endoplasmic reticulum in response to increased concentrations of inositol 1,4,5-trisphosphate (IP3). Thus, for taxa where relevant data are available, upstream pathways that elevate intraoocytic IP3 levels during fertilization are described, while other less-common modes of producing Ca2+ transients are also examined. In addition, the importance of fertilization-induced Ca2+ signals for activating development is underscored by noting some major downstream effects of these signals in various animals. © 2013 Wiley Periodicals, Inc.

This report summarizes the conference proceedings of Fostering DRR through Education for Sustainable Development: Toward a Better Future for Children. The conference, held at Tohoku University’s Kawauchi Hagi Hall on March 16, 2015, and attended by over 1,000 participants, focused on disaster risk reduction education within the context of education for sustainable development. This report discusses major themes emerging from presentations and panel discussions and draws some broad conclusions. © 2016, Fuji Technology Press. All rights reserved.

Ishizawa K.,Miyagi University of Education
Plant Cell Monographs | Year: 2014

The intracellular pH of living cells is strictly controlled in each compartment. Under normal conditions, the cytoplasmic pH (pHc) and the vacuolar pH (pHv) of typical plant cells are maintained at slightly alkaline (typically 7.5) and acidic (typically 5.5) values, respectively. A failure to maintain the pH homeostasis of cells leads to cell death. In general, anaerobic conditions induce acidosis in the cytoplasm of plant cells and thereby prolonged anoxia causes cell death. As a result, the regulation of intracellular pH has been an important topic for research in studies of the anoxia tolerance of plant cells (Plant Physiol 100:1–6, 1992; Annu Rev Plant Physiol Plant Mol Biol 48:223–250, 1997; Funct Plant Biol 30:1–47, 2003; Funct Plant Biol 30:999–1036, 2003; Plant Stress 2:1–19, 2008; Annu Rev Plant Biol 59:313–339, 2008). To date many researchers have published review articles to discuss acidosis and pH regulation of plant cells exposed to anaerobic conditions (Encyclopedia of plant physiology, Springer, Berlin, pp. 317–346, 1976; Annu Rev Plant Physiol 30:289–311, 1979; Int Rev Cytol 127:111–173, 1991; Ann Bot 79:39–48, 1997; Regulation of tissue pH in plants and animals, Cambridge University Press, Cambridge, pp. 193–213, 1999; Int Rev Cytol 206:1–44, 2001; Ann Bot 96:519–532, 2005; Plant roots: the hidden half, CRC Press, Boca Raton, Chapter 23, pp. 1–18, 2013). In this review, I will summarize the proposed mechanisms to control intracellular pH and include a brief discussion about anoxia tolerance on the basis of the limited information available for plant cells possessing extremely strong tolerance to anoxia. ©Springer-Verlag Wien 2014

Kawamura T.,Miyagi University of Education | Stevens C.H.,San Jose State University
Journal of Paleontology | Year: 2012

Four new species of colonial corals, one previously described coral, and two other unidentified species of coral have been recovered from the Baird Formation in the Klamath Mountains of northwestern California. The newly erected species are Heritschioides armstrongi n. sp., Pararachnastraea klamathensis n. sp., P. watkinsi n. sp., and P. kabyaiensis n. sp. These corals are associated with the fusulinids Millerella marblensis Thompson, 1944, Paramillerella Thompson, 1951, and Pseudostaffella Thompson, 1942, emend Groves, 1984, suggesting an early Atokan (Bashkirian) age. Both the coral and foraminiferal faunas bear a resemblance to those of similar age in the Brooks Range, Alaska, which could suggest geographic proximity between the two terranes at that time. These corals also represent the earliest known occurrence of the Family Durhamididae. © 2012 The Paleontological Society.

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