Doping effect on magnetic and transport properties of Pr 2-xSrxCoO4

10.1088/0953-8984/20/39/395213Journal of Physics Condensed Matter2039-JCOM

New barrier fusion excitation function of 6^6Li+208^{208}Pb

PT

New barrier fusion excitation function of 6^6Li+208^{208}Pb

PT

Does break-up affect 9^9Be + 209^{209}Bi fusion at the barrier?

The $^9$Be + $^{209}$Bi fusion cross sections were measured in the 36.0 MeV $\leq$ E$_{lab}$ $\leq$ 50.0 MeV range, down to 0.6 mb, with high accuracy via in-beam detection of the ground state $\alpha$-decay of the evaporation residues produced. The elastic scattering cross sections around 150$^o$ and 135$^o$ were also obtained with moderate angular resolution. The cross sections below the barrier are reproduced by coupled channel calculations which include only one break-up channel with a moderate strength and a phenomenological renormalization of the potential depth. These simple calculations overestimate the cross sections above the barrier most likely due to the fact that the $^9$Be break-up process becomes much stronger. The barrier distributions extracted do not have evident break-up signature since they show one-barrier structure

Studies on optimization of nitrogen sources for astaxanthin production by Phaffia rhodozyma

Fermentation of Phaffia rhodozyma is a major method for producing astaxanthin, an important pigment with industrial and pharmaceutical application. To improve astaxanthin productivity, single factor and mixture design experiments were used to investigate the effects of nitrogen source on Phaffia rhodozyma cultivation and astaxanthin production. Results of single factor experiments showed nitrogen source could significantly affect P. rhodozyma cultivation with respect to carbon source utilization, yeast growth and astaxanthin accumulation. Further studies of mixture design experiments using (NH(4))(2)SO(4), KNO(3) and beef extract as nitrogen sources indicated that the proportion of three nitrogen sources was very important to astaxanthin production. Validation experiments showed that the optimal nitrogen source was composed of 0.28 g/L (NH(4))(2)SO(4), 0.49 g/L KNO(3) and 1.19 g/L beef extract. The kinetic characteristics of batch cultivation were investigated in a 5-L pH-stat fermentor. The maximum amount of biomass and highest astaxanthin yield in terms of volume and in terms of biomass were 7.71 mg/L and 1.00 mg/g, respectively