11 To whom correspondence should be addressed: 12 Véréna Poinsot, Laboratoire des IMRCP, UMR5623 Université Paul Sabatier / 118 route de 13 Narbonne, 31062 Toulouse CEDEX 9, France. Tel : (0033) 5 61 55 68 08 ; Fax : (0033) 5 61 14 55 81 55 ; E-mail : [email protected] 15 Razika Gharzouli, department of Animal Biology, Faculty for Biology, University of 16 Mentouri / Route Ain Elbey Co...

Pb inhibits plant growth. To study Pb tolerance in rice (Oryza sativa), we screened 229 varieties for Pb tolerance or sensitivity. Three-day-old seedlings were treated for 12 d with 20 microM Pb solution. Based on the dry weight of the root, three Pb-tolerant (var CH-55, var KH-2J, var Kumnung) and three Pb-sensitive (var Aixueru, var C-9491, var Milyang23) rice varieties were selected. The roo...

Pseudouridine 55 synthase (Psi55S) catalyzes isomerization of uridine (U) to pseudouridine (Psi) at position 55 in transfer RNA. The crystal structures of Thermotoga maritima Psi55S, and its complex with RNA, have been determined at 2.9 and 3.0 A resolutions, respectively. Structural comparisons with other families of pseudouridine synthases (PsiS) indicate that Psi55S may acquire its ability t...

Many alphaviruses cause more severe disease in young animals than in older animals. The age-dependent resistance to severe disease is determined primarily by maturation of the host, but strains of virus can be selected that overcome the increased resistance of mature animals. Sindbis virus (SV) strain AR339 causes fatal encephalitis in newborn mice and nonfatal encephalitis in weanling mice, wh...