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Your search keyword '"Saito, M. H."' showing total 17 results
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17 results on '"Saito, M. H."'

1. Holomorphic Anomaly Equation and BPS State Counting of Rational Elliptic Surface

Author

Hosono, S., Saito, M. -H., and Takahashi, A.

Subjects
High Energy Physics - Theory, Mathematics - Algebraic Geometry
Abstract

We consider the generating function (prepotential) for Gromov-Witten invariants of rational elliptic surface. We apply the local mirror principle to calculate the prepotential and prove a certain recursion relation, holomorphic anomaly equation, for genus 0 and 1. We propose the holomorphic anomaly equation for all genera and apply it to determine higher genus Gromov-Witten invariants and also the BPS states on the surface. Generalizing G\"ottsche's formula for the Hilbert scheme of $g$ points on a surface, we find precise agreement of our results with the proposal recently made by Gopakumar and Vafa(hep-th/9812127)., Comment: 27 pages, uses harvmac.tex; published form with note added in proof

Published
1999

2. On the moduli of degree 4 Del Pezzo surfaces

Author

Fujino, O, Kondô, S, Moriwaki, A, Saito, M H, Fujino, O ( O ), Kondô, S ( S ), Moriwaki, A ( A ), Saito, M H ( M H ), Hassett, Brendan, Kresch, Andrew, Tschinkel, Yuri, Fujino, O, Kondô, S, Moriwaki, A, Saito, M H, Fujino, O ( O ), Kondô, S ( S ), Moriwaki, A ( A ), Saito, M H ( M H ), Hassett, Brendan, Kresch, Andrew, and Tschinkel, Yuri

Abstract

We study irreducibility of families of degree 4 Del Pezzo surface fibrations over curves.

Published
2016

4. On Mirror Symmetry Conjecture for Schoen’s Calabi-Yau 3 folds

Author

Hosono, S., Saito, M.-H., and Stienstra, J.

Subjects
Mathematics::Algebraic Geometry, Mathematics::Differential Geometry, Mathematics::Symplectic Geometry, Wiskunde en Informatica
Abstract

In this paper, we verify a part of the Mirror Symmetry Conjecture for Schoen’s Calabi-Yau 3-fold, which is a special complete intersection in a toric variety. We calculate a part of the prepotential of the A-model Yukawa couplings of the Calabi-Yau 3-fold directly by means of a theta function and Dedekind’s eta function. This gives infinitely many Gromov-Witten invariants, and equivalently infinitely many sets of rational curves in the Calabi-Yau 3-fold. Using the toric mirror construction [Ba-Bo, HKTY, Sti], we also calculate the prepotential of the B-model Yukawa couplings of the mirror partner. Comparing the expansion of the B-model prepotential with that of the A-model prepotential, we check a part of the Mirror Symmetry Conjecture up to a high order. http://www.arxiv.org/abs/alg-geom/9709027

Published
1998

7. A state‐of‐the‐art picture of substorm‐associated evolution of the near‐Earth magnetotail obtained from superposed epoch analysis

Author

Miyashita, Y., primary, Machida, S., additional, Kamide, Y., additional, Nagata, D., additional, Liou, K., additional, Fujimoto, M., additional, Ieda, A., additional, Saito, M. H., additional, Russell, C. T., additional, Christon, S. P., additional, Nosé, M., additional, Frey, H. U., additional, Shinohara, I., additional, Mukai, T., additional, Saito, Y., additional, and Hayakawa, H., additional

Published
2009
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16. On the moduli of degree 4 Del Pezzo surfaces

Author

Andrew Kresch, Yuri Tschinkel, Brendan Hassett, University of Zurich, Fujino, O, Kondô, S, Moriwaki, A, and Saito, M H

Subjects
14D23, 11G50, Pure mathematics, 010102 general mathematics, 01 natural sciences, Moduli, Degree (temperature), Mathematics - Algebraic Geometry, 10123 Institute of Mathematics, 010104 statistics & probability, 510 Mathematics, FOS: Mathematics, 14J26, 0101 mathematics, Algebraic Geometry (math.AG), Mathematics
Abstract

We study irreducibility of families of degree 4 Del Pezzo surface fibrations over curves., Comment: 36 pages

Published
2019
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17. The use of iodixanol for the purification of rat pancreatic islets.

Author

Dellê H, Saito MH, Yoshimoto PM, and Noronha IL

Subjects
Animals, Cell Separation methods, Centrifugation, Density Gradient, Male, Rats, Rats, Wistar, Contrast Media, Islets of Langerhans cytology, Triiodobenzoic Acids
Abstract

Transplantation of pancreatic islets is a promising therapeutic treatment for type 1 diabetes mellitus. For clinical and experimental transplantation, a large number of pure pancreatic islets are required for transplantation. Thus, the improvement of islet isolation and purification techniques are crucial. In this context, iodixanol-based solution, successfully used for the purification of porcine islets, seems to be a possible alternative to Ficoll for purification of islets. The aim of this study was to test the efficacy of iodixanol compared with Ficoll density gradients for the purification of rat pancreatic islets. Twelve Wistar rats were used for isolation and purification of pancreatic islets. Pancreata were digested with Liberase R1 and islets purified by two gradients: Ficoll or iodixanol gradient. The number and the purity of the pancreatic islets were assessed. To analyze the response of isolated pancreatic islet to glucose challenge, in vitro experiments were performed by measuring the insulin concentration in the Supernatant. The results demonstrated that the iodixanol gradient provided a higher purity of pancreatic islets compared to the Ficoll gradient. In addition, the rat islet yield by iodixanol gradient was significantly higher compared to a Ficoll gradient (751 +/- 16 versus 464 +/- 19 pancreatic islets, respectively; P < .001). The viability of pancreatic islets isolated by an iodixanol gradient was confirmed by high glucose challenge, with more than twofold higher increase in insulin secretion. The present study demonstrated that iodixanol density gradient overcomes Ficoll density gradient, providing a greater number of pure and functional rat pancreatic islets.

Published
2007
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