The transcript abundance of GmGT-2, a new member of the GT-2 family of transcription factors from soybean, is down-regulated by light in a phytochrome-dependent manner

A new member of the GT-2 family of transcription factors, GmGT-2, was isolated from soybean while screening a cDNA library with a protein binding site (D1) in the promoter of Aux28, a member of the Aux/IAA family of auxin-responsive genes. GmGT-2 possesses various primary amino acid sequence characteristics common to all GT-2 factors thus far isolated, including sequence identity in the twin trihelix DNA-binding domains. Recombinant GmGT-2 expressed in Escherichia coli binds oligotetramers of both D1 and various GT-boxes. However, unlike other known members of the GT-2 family, GmGT-2 message levels are down-regulated by light in a phytochrome-dependent manner. Evidence is presented that the expression levels of Aux28 mRNA are also down-regulated by phytochrome. These results and other referenced data implicate the possible convergence of phytochrome and auxin signaling pathways.

Triangle Singularity as the Origin of the a_{1}(1420)

The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a_{1}(1420), decaying to f_{0}(980)π. With a mass too close to and a width smaller than the axial-vector ground state a_{1}(1260), it was immediately interpreted as a new light exotic meson, similar to the X, Y, Z states in the hidden-charm sector. We show that a resonancelike signal fully matching the experimental data is produced by the decay of the a_{1}(1260) resonance into K^{*}(→Kπ)K[over ¯] and subsequent rescattering through a triangle singularity into the coupled f_{0}(980)π channel. The amplitude for this process is calculated using a new approach based on dispersion relations. The triangle-singularity model is fitted to the partial-wave data of the COMPASS experiment. Despite having fewer parameters, this fit shows a slightly better quality than the one using a resonance hypothesis and thus eliminates the need for an additional resonance in order to describe the data. We thereby demonstrate for the first time in the light-meson sector that a resonancelike structure in the experimental data can be described by rescattering through a triangle singularity, providing evidence for a genuine three-body effect.

[Early isotopic synoviorthesis during rheumatoid polyarthritis (RP)]

The authors report the results of 1258 chemical synovectomies carried out in subjects with rheumatoid polyarthritis on joints at Steinbrocker stage I and of 470 chemical synovectomies carried out during the first year of evolution of rheumatoid polyarthritis. Comparison with the results of chemical synovectomy carried out later demonstrate the superiority of early chemical synovectomy.