860 research outputs found
TdIF1 recognizes a specific DNA sequence through its Helix-Turn-Helix and AT-hook motifs to regulate gene transcription
Peer reviewedPublisher PD
A non-canonical function of Plk4 in centriolar satellite integrity and ciliogenesis through PCM1 phosphorylation
Centrioles are the major constituents of the animal centrosome, in which Plk4 kinase serves as a master regulator of the duplication cycle. Many eukaryotes also contain numerous peripheral particles known as centriolar satellites. While centriolar satellites aid centriole assembly and primary cilium formation, it is unknown whether Plk4 plays any regulatory roles in centriolar satellite integrity. Here we show that Plk4 is a critical determinant of centriolar satellite organisation. Plk4 depletion leads to the dispersion of centriolar satellites and perturbed ciliogenesis. Plk4 interacts with the satellite component PCM1, and its kinase activity is required for phosphorylation of the conserved S372. The nonphosphorylatable PCM1 mutant recapitulates phenotypes of Plk4 depletion, while the phosphomimetic mutant partially rescues the dispersed centriolar satellite patterns and ciliogenesis in cells depleted of PCM1. We show that S372 phosphorylation occurs during the G1 phase of the cell cycle and is important for PCM1 dimerisation and interaction with other satellite components. Our findings reveal that Plk4 is required for centriolar satellite function, which may underlie the ciliogenesis defects caused by Plk4 dysfunction
Top Pair Production in e^+ e^- and gamma gamma Processes
We analyze spin correlations between top quark and anti-top quark produced at
polarized e^+ e^- and gamma gamma colliders. We consider a generic spin basis
to find a strong spin correlation. Optimal spin decompositions for top quark
pair are presented for e^+ e^- and gamma gamma colliders. We show the
cross-section in these bases and discuss the characteristics of results.Comment: 10 pages, 5 Postscript figures, sprocl.sty, psfig.sty and here.sty
are required. Invited talk presented at the International Symposium on ``QCD
Corrections and New Physics'' October 27-29, 1997 held at Hiroshima, Japa
Latent pH-responsive ratiometric fluorescent cluster based on self-assembled photoactivated SNARF derivatives
We have developed a self-assembled fluorescent cluster comprising a seminaphthorhodafluor (SNARF) derivative protected by a photoremovable o-nitrobenzyl group. Prior to UV irradiation, a colorless and nonfluorescent cluster was spontaneously assembled in aqueous solution. After UV irradiation, the self-assembled cluster remained intact and showed a large enhancement in pH-responsive fluorescence. The unique pH responsive fluorescent cluster could be used as a dual-emissive ratiometric fluorescent pH probe not only in the test tube but also in HeLa cell cultures
Brillouin laser-driven terahertz oscillator up to 3 THz with femtosecond-level timing jitter
The terahertz (THz) frequency range, spanning 0.1 to 10 THz, is a field ripe
for innovation with vast, developing potential in areas like wireless
communication and molecular spectroscopy. Our work introduces a dual-wavelength
laser design that utilizes stimulated Brillouin scattering in an optical fiber
cavity to effectively generate two highly coherent optical Stokes waves with
differential phase noise inherently mitigated. To guarantee robust operation,
the Stokes waves are optically injected into their respective pump lasers,
which also serves to greatly improve the resulting coherence. The frequency
difference between the two wavelengths is converted into THz waves through a
uni-traveling-carrier photodiode. This innovative design facilitates the
generation of THz waves with phase noise levels of less than -100 dBc/Hz,
translating to timing noise below 10~ at 10
kHz Fourier frequency, over a carrier frequency range from 300 GHz to 3 THz.
This development in phase noise reduction establishes a new benchmark in the
spectral purity of tunable THz sources. Such advances are pivotal for
applications to move beyond oscillator constraints
Observation of a Dirac nodal line in AlB2
We have performed angle-resolved photoemission spectroscopy of AlB2 which is
isostructural to high-temperature superconductor MgB2. Using soft-x-ray
photons, we accurately determined the three-dimensional bulk band structure and
found a highly anisotropic Dirac-cone band at the K point in the bulk hexagonal
Brillouin zone. This band disperses downward on approaching the H point while
keeping its degeneracy at the Dirac point, producing a characteristic Dirac
nodal line along the KH line. We also found that the band structure of AlB2 is
regarded as a heavily electron-doped version of MgB2 and is therefore well
suited for fully visualizing the predicted Dirac nodal line. The present
results suggest that (Al,Mg)B2 system is a promising platform for studying the
interplay among Dirac nodal line, carrier doping, and possible topological
superconducting properties.Comment: 6 pages, 3 figure
- …