Japan Atomic Energy Research Institute

About: Japan Atomic Energy Research Institute is a based out in . It is known for research contribution in the topics: Neutron & Irradiation. The organization has 7707 authors who have published 14471 publications receiving 207688 citations.

A rice homolog of Cdk7/MO15 phosphorylates both cyclin-dependent protein kinases and the carboxy-terminal domain of RNA polymerase II.

Abstract: Summary The activation of cyclin-dependent protein kinases (CDKs) requires phosphorylation of a threonine residue within the T-loop by a CDK-activating kinase (CAK). The R2 protein of rice is very similar to CAKs of animals and fission yeast at the amino acid level but phosphorylation by R2 has not yet been demonstrated. WhenR2was overexpressed in a CAK-deficient mutant of budding yeast, it suppressed the temperature sensitivity of the mutation. Immunoprecipitates of rice proteins with the anti-R2 antibody phosphorylated human CDK2, one of the rice CDKs (Cdc2Os1), and the carboxy-terminal domain (CTD) of the largest subunit of RNA polymerase II ofArabidopsis. Mutational analysis indicated that R2 phosphorylated the threonine residue within the T-loop of CDK2 and Cdc2Os1. R2 was found mainly in two protein complexes which had molecular masses of 190 kDa and 70 kDa, respectively, whilst the CDK- and CTD-kinase activities associated with R2 were identified in a complex of 105 kDa. These results indicate that R2 is closely related to CAKs of animals and fission yeast in terms of its phosphorylation activity and, moreover, that this CAK of rice is distinct from a CAK of the dicotyledonous plantArabidopsis.

Neutron Scattering Study on the Incommensurate Phases in Rb 2 ZnBr 4

Abstract: The satellite scatterings at ( h , 0, l ±(1/3-δ)) in Rb 2 ZnBr 4 have been studied by neutron scattering. Two incommensurate phases (δ≠0) were observed above the ferroelectric Curie point T c =-83^° C in temperature ranges of +50^° C ∼ -74^° C and -74^° C ∼ T c in a cooling process. The parameter δ is 0.04 and almost temperature independent in the upper phase, and it decreases rapidly with decreasing temperature in the lower phase, then, vanishes discontinuously at T c .

Cyanomethylene Formation from the Reaction of Excited Nitrogen Atoms with Acetylene: A Crossed Beam and ab Initio Study

Abstract: The reaction of excited nitrogen atoms, N(2D), with the simplest alkyne, C2H2, was investigated for the first time under single-collision conditions in crossed beam experiments with mass spectrometric detection. The experimental results combined with electronic structure calculations and RRKM predictions allow us to identify cyanomethylene (HCCN) as the main primary reaction product and to establish its formation dynamics. The identification of the N/H exchange channel suggests that the title reaction is a good candidate to explain formation of nitriles in the upper atmosphere of Titan.

Estimations of Plasma Position and βp+li/2 from Magnetic Measurements under High-β Conditions in JET-2

Abstract: The MHD equilibria of a high-β plasma are studied by carring out magnetic measurements in JFT-2. Equilibrium configurations agreeing well with the experimental results are obtained by numerical calculations, and βp, in the NB injection phase is estimated. Using these calculated equilibrium configurations, two methods of estimating Rp and βp+li/2 from magnetic probe signals are also discussed, and the Fourier analysis method is shown to give a more accurate value of Rp and βp+li/2 even under high-β conditions.