background: spondyloarthropathies are a group of closely related inflammatory arthritis which involve the axial skeleton and are negative for rheumatoid factor. objective: this case-control study was conducted to examine hla- b27 positivity in patients with seronegative spondyloarthritis (ssa) as per essg criteria and compare the frequency with healthy controls because a lower positivity is rep...

Abstract The southeastern Central Asian Orogenic Belt (CAOB) records the assembly process between several micro-continental blocks and North China Craton (NCC), with consumption of Paleo-Asian Ocean (PAO), but whether S-wards subduction PAO beneath northern NCC was ongoing during Carboniferous–Permian time is still being debated. A key issue to resolve this controversy Carboniferous magmatism i...

Active and passive continental rifts are generally attributed to plume subduction mechanisms, respectively. However, controversy surrounding the role of two mechanisms continues, especially for mid-Neoproterozoic in South China Craton. Here, we use geochemical zircon Hf isotope data from craton’s rift successions examine mechanism rifting. The compiled support existence subduction-related magma...

Plans for NextGen include the implementation of Net-Centric Operations (NCO) as the underlying mechanism to more effectively manage National Air Transportation System (NAS) resources. NCO mechanisms will provide the means for all agents operating in the NAS to self-synchronize in the presence of changing situations and probabilistic forecasts. Applications of NCO in other domains (e.g. military...

In the September 23, 2005 issue, Cell published a re-traction of a 2004 paper from Nitz et al. on heritable integration of parasite DNA into host genomes. This was a very unusual situation in which the paper was retracted by the journal rather than by the authors of the paper. The decision to retract the paper came after a year of careful consideration and extensive correspondence with both the...