Using orthogonal design to determine optimal conditions for intergeneric protoplasts fusion between Mingxian169 and Y2155a

This study is important for the optimization of protoplast fusogen and washing solution system suitable for protoplast fusion between the Triticum aestivum and Aegilops. By enzymolysis, the result shows that more than 90% viable protoplasts of Mingxian169 (common wheat) and Y2155a (Aegilops) were efficiently obtained and fused. The greatest of protoplast fusogen and washing solution condition was developed using an orthogonal experimental design, L25 (55), where L=orthogonal table; 5=factors; 5=five levels of each; and 25=experimental number. It was shown that the greatest protoplast fusogen was found at PEG6000 content (w/v) 25%, 0.50 M sucrose, pH 6.0 and washing solution was 5.0 mM CaCl2. Over 10% viable heterokaryons was produced using different fusion condition. Because of the narrow genetic diversity of common wheat and elite agronomic traits of many wild relatives, it is very important and helpful for the improvement of common wheat through somatic hybridization between wheat and wheat wild relatives,Key words: Protoplast, fusion, orthogonal design method, Mingxian 169, Y2155a

Hydrogen lines in LAMOST low-resolution spectra of RR Lyrae stars

AbstractThe LAMOST pilot survey has produced a data release containing over 600,000 stellar spectra. By cross-checking with a large time series photometric database of RR Lyrae stars in high Galactic latitude regions, we found a total number of 157 RR Lyrae stars that have been observed with LAMOST. In this sample, we successfully captured three RR Lyrae stars in the fast expansion phase, all of them showing hypersonic shock wave features in the Balmer line region. We fit the shape of Hα line region and determine that the emission feature seen within the broadened Hα absorption line suggests hypersonic relative motion in the atmospheres of these three objects. With a further LAMOST survey of millions of stars, we plan to capture a large sample of RR Lyrae stars in their hypersonic expansion phase, and therefore provide a large database for the study of the internal structure and the pulsation mechanism of RR Lyrae stars

Measurement of the branching fractions of psi(2S) -> 3(pi+pi-) and J/psi -> 2(pi+pi-)

Using data samples collected at sqrt(s) = 3.686GeV and 3.650GeV by the BESII detector at the BEPC, the branching fraction of psi(2S) -> 3(pi+pi-) is measured to be [4.83 +- 0.38(stat) +- 0.69(syst)] x 10^-4, and the relative branching fraction of J/psi -> 2(pi+pi-) to that of J/psi -> mu+mu- is measured to be [5.86 +- 0.19(stat) +- 0.39(syst)]% via psi(2S) -> (pi+pi-)J/psi, J/psi -> 2(pi+pi-). The electromagnetic form factor of 3(pi+pi-) is determined to be 0.21 +- 0.02 and 0.20 +- 0.01 at sqrt(s) = 3.686GeV and 3.650GeV, respectively.Comment: 17pages, 7 figures, submitted to Phys. Rev.

Measurement of the chi_{c2} Polarization in psi(2S) to gamma chi_{c2}

The polarization of the chi_{c2} produced in psi(2S) decays into gamma chi_{c2} is measured using a sample of 14*10^6 psi(2S) events collected by BESII at the BEPC. A fit to the chi_{c2} production and decay angular distributions in psi(2S) to gamma chi_{c2}, chi_{c2} to pi pi and KK yields values x=A_1/A_0=2.08+/-0.44 and y=A_2/A_0=3.03 +/-0.66, with a correlation rho=0.92 between them, where A_{0,1,2} are the chi_{c2} helicity amplitudes. The measurement agrees with a pure E1 transition, and M2 and E3 contributions do not differ significantly from zero.Comment: 6 pages, 4 figures, 1 tabl