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180511 documents, page 1 of 18052

Lack of effect of a 5-HT3 antagonist, pancopride, on lower oesophageal sphincter pressure in volunteers.

Effects of pancopride (5 and 10 mg, intravenously), on lower oesophageal sphincter pressure (LOESP), were assessed in healthy volunteers by means of oesophageal manometry. After pancopride 10 mg, the LOESP was higher than placebo and 5 mg pancopride but there were no differences among the three treatments (P = 0.42). The areas under the curve were similar without differences, neither with absolute measurements (P = 0.53) nor after a baseline correction (P = 0.16). In conclusion, pancopride ha...

Clinical ROC Studies of Digital Stereo Mammography

The objective of this study was to explore and document the diagnostic utility of digital stereo mammography for the detection of localized breast cancer in women. In it we character­ized the ability of experienced mammographers, general radiologists, and non-radiologists to detect three types of tumor masses embedded within a heterogeneous background of normal tis­sue elements in numerically simulated digital mammograms. The simulated mammograms were displayed to the subjects on a high resol...

Phase-Transition theory of Instabilities. IV. Critical Points on the Maclaurin Sequence and Nonlinear Fission Processes

We use a free-energy minimization approach to describe the secular and dynamical instabilities as well as the bifurcations along equilibrium sequences of rotating, self-gravitating fluid systems. Our approach is fully nonlinear and stems from the Landau-Ginzburg theory of phase transitions. Here we examine higher than 2nd-harmonic disturbances applied to Maclaurin spheroids, the corresponding bifurcating sequences, and their relation to nonlinear fission processes. The triangle and ammonite s...

Role of Staphylococcus aureus coagulase and clumping factor in pathogenesis of experimental endocarditis.

The pathogenic role of staphylococcal coagulase and clumping factor was investigated in the rat model of endocarditis. The coagulase-producing and clumping factor-producing parent strain Staphylococcus aureus Newman and a series of mutants defective in either coagulase, clumping factor, or both were tested for their ability (i) to attach in vitro to either rat fibrinogen or platelet-fibrin clots and (ii) to produce endocarditis in rats with catheter-induced aortic vegetations. In vitro, the c...

Influence of inorganic phosphate and pH on ATP utilization in fast and slow skeletal muscle fibers.

The influence of P(i) and pH was studied on myofibrillar ATP turnover and force development during maximally activated isometric contractions, in skinned single fibers from rabbit soleus and psoas muscle. ATP hydrolysis was coupled to the breakdown of NADH, which was monitored photometrically at 340 nm. In psoas the depression by phosphate of force is twice that of ATP turnover, but in soleus force and ATP turnover are depressed equally by P(i). Most, but not all, of the ATPase and force valu...