62 research outputs found
A reassessment of Kelmayisaurus petrolicus, a large theropod dinosaur from the Early Cretaceous of China
The Early Cretaceous fossil record of largeâbodied theropods from Asia is poor, hindering comparison of Asian predatory dinosaur faunas with those from other continents. One of the few large Asian theropod specimens from this interval is a partial skull (maxilla and dentary) from the Lianmugin Formation (?ValanginianâAlbian), the holotype of Kelmayisaurus petrolicus. Most authors have either considered this specimen as an indeterminate basal tetanuran or a nomen dubium. Weredescribe K. petrolicus and note that it possesses a single autapomorphy (a deep accessory groove on the lateral surface of the anterior dentary), as well as a unique combination of characters that differentiates it from other theropods, affirming its validity. A phylogenetic analysis recovers K. petrolicus as a basal carcharodontosaurid, which is supported by various features: very deep interdental plates (a carcharodontosaurid synapomorphy), fused interdental plates (present in carchardontosaurids and a limited number of other theropods), and the absence of diagnostic features of other clades of largeâbodied theropods such as abelisaurids, megalosauroids, and coelurosaurs. As such, Kelmayisaurus is the second known carcharodontosaurid from Asia, and further evidence that this clade represented a global radiation of largeâbodied predators during the Earlyâmid Cretaceous
Dissecting the sugarcane expressed sequence tag (SUCEST) database: unraveling flower-specific genes
Measurement of prompt hadron production ratios in collisions at 0.9 and 7 TeV
The charged-particle production ratios , , ,
, and are measured with the LHCb detector using of collisions delivered by the LHC at TeV and
at TeV. The measurements are performed as a
function of transverse momentum and pseudorapidity . The
production ratios are compared to the predictions of several Monte Carlo
generator settings, none of which are able to describe adequately all
observables. The ratio is also considered as a function of rapidity
loss, , and is used to constrain models of
baryon transport.Comment: Incorrect entries in Table 2 corrected. No consequences for rest of
pape
THE HIGH-PRECISION SOLUBILITY OF GASES IN LIQUID WATER AT CA. ATMOSPHERIC PRESSURE AND TEMPERATURE FROM ABOUT 273 TO 333 Î
Turbulent shear stress effects on plant cell suspension cultures
A study of the effects of hydrodynamic turbulent shear stress on the biological responses of carrot cell cultures (Daucus carota) has been performed over a range of turbulent shear stresses. The experimental apparatus mimics turbulent conditions similar to the impeller region of a conventional stirred tank bioreactor. The apparatus was designed with the aid of simulations made using the computational fluid dynamics package CFX4. It consists of two concentric cylinders and a rotating cylindrical rod to provide turbulent mixing. The model was based on the two dimensional structure of a cylindrical wake in an annulus. The empirical shear stress agreed well with simulated values. Cell damage was found to correlate well with both the bulk energy dissipation and âlocalâ energy dissipation rate. The initial results suggest that significant cell damage occurs when the maximum energy dissipation is 50 Wkgâ»Âč and the total energy dissipation is 10⎠Jkgâ»Âč. These values are slightly higher than those reported earlierÂčâ»ÂČ
Intercorrelations of Glucose Metabolic Rates between Brain Regions: Application to Healthy Males in a State of Reduced Sensory Input
Cross-National Stability of a Quality Management Model: A Comparative Study of the United States and Turkey
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