Effect of Temperature of Incubation on Activation of Brain-Pro thoracic Gland System of Diapausing Pupae in Samia cynthia pryeri

Termination of diapause occurs with activation of brain-prothoracic gland system in diapausing pupae of Samia cynthia pryeri. It does not occur with 20℃ incubation, but it occurs with 26℃ incubation. To investigate the cause of this fact histological change of neurosecretory cells of pupal brain during incubation and effect of β-ecdysone injection were observed. In histological observation, phloxinophilic granules of lateral B type cells in pars intercerebralis decreased on and after the 5-th day of 20℃ incubation. Diapausing pupae developed into imagines with β-ecdysone injection during 20℃ incubation. From these results, it is concluded that fail of termination of diapause with 20℃ incubation is not resulted from the inactive state of neurosecretory cells in brain but it is resulted from the inactive state of ecdysone secretory system in this temperature.Article信州大学理学部紀要 21(2): 105-114(1987)departmental bulletin pape

Multifold curdlan gel formation by dialysis into aqueous solutions of metal salts

We have found that the dialysis of curdlan dissolved in alkaline solution into aqueous solutions of metal salts yielded multifold gel structures. Aqueous sodium chloride and potassium chloride as well as pure water induced isotropic gels. Aqueous calcium salts induced liquid crystalline gel with refractive index gradient/amorphous gel alternative structure. Aqueous salts of trivalent aluminum and ferric cations induced a rigid liquid crystalline gel, which shrank above a threshold concentration of each salt. On the other hand, Liesegang ring-like pattern was observed with aqueous solutions of mixed salts of calcium chloride and magnesium chloride. The patterns have been classified to discuss the mechanism of forming the variety of structures

すばる望遠鏡ライマンアルファ輝線天体探査による銀河進化と宇宙再電離史の研究

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 土居 守, 大阪産業大学准教授 井上 昭雄, 国立天文台准教授 柏川 伸成, 東京大学准教授 梶野 敏貴, 東京大学准教授 本原 顕太郎University of Tokyo(東京大学

The Stellar Mass, Star Formation Rate and Dark Matter Halo Properties of LAEs at z∼2z\sim2

We present average stellar population properties and dark matter halo masses of $z \sim 2$ \lya emitters (LAEs) from SED fitting and clustering analysis, respectively, using $\simeq$ $1250$ objects ($NB387\le25.5$) in four separate fields of $\simeq 1$ deg$^2$ in total. With an average stellar mass of $10.2\, \pm\, 1.8\times 10^8\ {\mathrm M_\odot}$ and star formation rate of $3.4\, \pm\, 0.4\ {\mathrm M_\odot}\ {\rm yr^{-1}}$, the LAEs lie on an extrapolation of the star-formation main sequence (MS) to low stellar mass. Their effective dark matter halo mass is estimated to be $4.0_{-2.9}^{+5.1} \times 10^{10}\ {\mathrm M_\odot}$with an effective bias of$1.22^{+0.16}_{-0.18}$which is lower than that of$z \sim 2$LAEs ($1.8\, \pm\, 0.3$), obtained by a previous study based on a three times smaller survey area, with a probability of$96\%. However, the difference in the bias values can be explained if cosmic variance is taken into account. If such a low halo mass implies a low HI gas mass, this result appears to be consistent with the observations of a high \lya escape fraction. With the low halo masses and ongoing star formation, our LAEs have a relatively high stellar-to-halo mass ratio (SHMR) and a high efficiency of converting baryons into stars. The extended Press-Schechter formalism predicts that at z=0$our LAEs are typically embedded in halos with masses similar to that of the Large Magellanic Cloud (LMC); they will also have similar SHMRs to the LMC, if their SFRs are largely suppressed after$z \sim 2$ as some previous studies have reported for the LMC itself.Comment: 34 pages, 15 figures, 6 tables. Accepted for publication in PAS

Gravelly Soil Properties by Field and Laboratory Tests

The basic policy in Japan is to build nuclear reactor buildings on rock. But, in order to cope with the middle and long term siting problems it has become necessary to develop new siting technology from the standpoint of expanding the available range of site selections and effective utilization of lands. The gravelly soil layer in the Quaternary deposits has high possibility of becoming the bearing soil stratum when constructing a nuclear power plant. In order to verify the seismic stability of such gravelly soil layers, a series of field dynamic and static torsional loading tests for large scale in-situ soil columns were performed. In addition, a series of laboratory tests using a large scale triaxial test apparatus on high quality undisturbed gravel samples obtained by in-situ freezing method were performed. Herein reported are the sampling method of high quality undisturbed samples, laboratory test results and the large in-situ soil column test results