Measurements of Dose Distribution of Neutrons and γ-Rays in the Beam Transportation Room of a Cyclotron Building with Personnel Monitors

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Neutron and γ-Ray Dosimetry by Means of Solid State Track Detector (CR-39) and TLD

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Measurement of Neutron Dose by Means of Solid State Track Detector (CR-39)

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The relationships between AGN power and molecular gas mass within 500 pc of the center of elliptical galaxies

The physical quantity that directly controls the feedback of active galactic nuclei (AGNs) in galactic nuclei (AGN) in elliptical galaxies remains to be determined. The discovery of molecular gas around the AGNs suggests that the gas is fueling the AGNs. Therefore, we analyze Atacama Large Millimeter/submillimeter Array (ALMA) data on CO line (J=1-0, 2-1, 3-2) emission and estimate the mass of molecular gas within 500pc of the center of 12 normal elliptical galaxies and 10 of the brightest cluster galaxies (BCGs). We find that the mass (M_mol~10^5-10^9 M_sun) has a correlation with the jet power of their AGNs, which is represented by P_cav~6.2x10^42(M_mol/10^7M_sun)^{0.68} erg s^{-1}. We also find that M_mol is correlated with the AGN continuum luminosities at ~1.4GHz (L_{1.4}) and ~100-300GHz (L_con). Since P_cav reflects galactic-scale, long-term AGN activity, while the continuum luminosities reflect local (~<500pc), short-term AGN activity, our results suggest that the AGN activity depends on the amount of the gas, regardless of its time scale. On the other hand, we cannot find a clear correlation between the mass of the black holes in the AGNs (M_BH) and P_cav. While this is probably because the black holes in our sample galaxies have similar masses, it suggests that M_mol, rather than M_BH, is the main factor that controls the AGN activity. We confirm that the origin of the continuum emission from the AGNs at ~1.4-300GHz is mostly synchrotron radiation

The correlation between the 500 pc scale molecular gas masses and AGN powers for massive elliptical galaxies

Massive molecular clouds have been discovered in massive elliptical galaxies at the center of galaxy clusters. Some of this cold gas is expected to flow in the central supermassive black holes and activate galactic nucleus (AGN) feedback. In this study, we analyze archival ALMA data of 9 massive elliptical galaxies, focusing on CO line emissions, to explore the circumnuclear gas. We show that the mass of the molecular gas within a fixed radius (500 pc) from the AGNs (M_mol ~ 10^7-10^8 M_sun) is correlated with the jet power estimated from X-ray cavities (P_cav ~ 10^42-10^45 erg/s). The mass accretion rate of the circumnuclear gas \dot{M} also has a correlation with P_cav. On the other hand, the continuum luminosities at ~1.4 GHz and ~100-300 GHz have no correlation with M_mol. These results indicate that the circumnuclear gas is sustaining the long-term AGN activities (~10^7 yr) rather than the current ones. The circumnuclear gas mass is a better indicator of the jet power than the continuum luminosity, which probably changes on a shorter time scale. We also study the origin of the continuum emission from the AGNs at ~100-300 GHz and find that it is mostly synchrotron radiation. For low-luminosity AGNs, however, dust emission appears to contaminate the continuum.Comment: Accepted for publication in PAS

Disposition of Radioactive Organic Scintillation Solvents by Incineration

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Identification of trehalose dimycolate (cord factor) in Mycobacterium leprae

AbstractGlycolipids of Mycobacterium leprae obtained from armadillo tissue nodules infected with the bacteria were analyzed. Mass spectrometric analysis of the glycolipids indicated the presence of trehalose 6,6′-dimycolate (TDM) together with trehalose 6-monomycolate (TMM) and phenolic glycolipid-I (PGL-I). The analysis showed that M. leprae-derived TDM and TMM possessed both α- and keto-mycolates centering at C78 in the former and at C81 or 83 in the latter subclasses, respectively. For the first time, MALDI-TOF mass analyses showed the presence of TDM in M. leprae

Epigenetics of Vascular Formation during Zebrafish Hindbrain Development

The brain circulatory system is essential for the survival and development of the central nervous system in all vertebrates. Brain vessels form in a reproducible and evolutionarily conserved manner. In zebrafish, hindbrain vessels develop independently of the shear stress of blood flow but are regulated genetically. Epigenetics is another regulatory system regulating gene activation, but the epigenetic contribution to angiogenesis remains unclear. Here, we examine expression patterns of genes involved in SET1/mixed lineage leukemia (MLL) histone methyltransferase complexes. All mRNAs we tested as orthologs of molecules in the MLL complex were expressed throughout the central nervous system, including the hindbrain. We also show immunofluorescent staining of retinoblastoma-binding protein 5 (RBBP5) protein in the dorsal hindbrain, suggesting the possibility of differences in epigenetic state along the dorsalventral axis. Finally, we demonstrate histone methylation with non-methylated, dimethylated, and trimethylated types.Full-Length PaperBy a grant from Research Institute for Integrated Science, Kanagawa Universit