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...

the outstanding feature of the life of mesozoic time is the rise to dominance of the reptiles and their radiation into almost all modes of existence on the lands, in the waters, and in the air . chief place among the invertebrates is occupied by the cephalopods which reached at this time the culmination of their career. this is indicated by their extraordinary specialization along many lines, m...

a r t i c l e i n f o Crust extracted from the mantle in arcs is refined into continental crust in subduction zones. During sediment subduction, subduction erosion, arc subduction, and continent subduction, mafic rocks become eclogite and may sink into the mantle, whereas more silica-rich rocks are transformed into felsic gneisses that are less dense than peridotite but more dense than the uppe...

The current profile along the 126 ns, multi-bunch beam pulse in the Next Linear Collider Test Accelerator (NLCTA) is monitored with fast toroids (rise time ~1 ns). Inserted at several positions along the beam line, they allow us to track current transmission as a function of position along the bunch train. Various measurements, such as rise time, current, width, and slope, are made on the digit...

*Thanks are due to Hans Rott and Maurice Pagnucco who have commented on the July draft of this essay and who subsequently sent me a draft of their ideas on contraction. I have sought here to explain how I came to change my mind and favor mild contractions (or severe withdrawals as Rott and Pagnucco call such contractions) and to indicate some of the relations between the approach of Rott and Pa...

Abstract Continental reconstructions became a geological problem after the rise of continental drift. With plate tectonics, it easy to make once ocean-floor magnetic anomaly stripes available. However, for times before medial Jurassic, must depend on palaeomagnetism, palaeoclimatology and palaeobiogeography. All three methods give rough latitudinal control, whereas obtaining longitudinal contro...