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Presents a restriction fragment length polymorphism (RFLP) map of Gossypium hirsutum and Gossypium barbadense. Chromosome organization and evolution in cotton; Assembly of RFLP loci into linkage groups; Linkage among duplicated RFLPs; Translocation and polyploidization.

Abstract: First-principles calculations are carried out in order to find the ferromagnetism dependence on the number of holes substituted for Sn sites. The results show that strong localization of defect states of the p bands of the oxygen atoms near the dopants favors high-spin states and local moment formation. These states appear to be ferromagnetically coupled with a rather long-range magnetic interaction, resulting in a half-metallic ferromagnetic ground state for the whole systems. Analysis of the total energies indicates that the induced well-confined ferromagnetism in the oxygen p orbitals due to hole doping is quite possible and easily controlled in these systems, which indicate a new way to develop a half-metallic ferromagnet in nonmagnetic oxides. [Copyright &y& Elsevier]

Abstract: The electronic density of states, spin-splittings and atomic magnetic moments of SmCo5.85Si0.90 alloy have been studied using the spin-polarized MS-Xα method. The results show that a few of electrons are transferred to Sm(5d0) orbital due to orbital hybridization between Sm and Co atoms in the alloy. The exchange interactions between 3d and 5d electrons are more important than that of the polarization effects of the conductive electrons, thus it is the main reason resulting in the long-range ferromagnetic order in SmCo5.85Si0.90 alloy. There are some negative exchange couplings mainly occurring at Co(2e) site, which weaken the average strength of coupling between Co lattices. Thus, the Curie temperature of SmCo5.85Si0.90 alloy decreases distinctly compared with pure Co. The calculated results for the Sm5Co28Si6 cluster may lead to a better understanding of why SmCo5.85Si0.90 alloy is stable phase. Since the spin-up DOS peak of d electrons at EF rises and the bonding of electrons at EF strengthens with increasing Si concentration, which result in the free energy of the alloy decrease, the stable ferromagnetic order forms inside SmCo5.85Si0.90 alloy. Considering the localization of 4f electrons and a few of 5d electrons arising from the orbital hybridization, the magnetic moment of Sm atom will be 1.24μB in SmCo5.85Si0.90 alloy that is in agreement well with the experiments of Sm3+ ion-moment and Sm atom-moment in metals. [Copyright &y& Elsevier]

We adapt the local density approximation to add the high-momentum tails (HMTs) to finite nuclei's Slater-determinant momentum distributions. The HMTs are extracted by the extended Brueckner-Hartree-Fock (EBHF) method or by the lowest order cluster approximation. With a correction factor being added to EBHF, it is sufficiently in agreement with the experimental benchmark, i.e., the high-momentum N / Z ratios approximately equal to 1, and the low-momentum N / Z ratios approximately equal to N / Z of the systems. It is also found that the tensor force makes the nucleon-nucleon correlations appear more easily on the nuclear surface region and the percentage of high-momentum (p > 300 MeV/c) nucleons, around 17%–18%, independent of isospin asymmetry. [ABSTRACT FROM AUTHOR]