19. Tyberg JV, Yeatman LA, Parmley WW, Urschel CW, Sonnenblick EH: Effects of hypoxia on mechanism of cardiac contraction. Am J Physiol 218: 1780-1788, 1970 20. Forrester JS, Amsterdam EA, Parmley WW, Sonnenblick EH, Urschel CW: Dissociation of myocardial contractility and pump performance in hemorrhagic shock. Cardiology 57: 333-347, 1972 21. Shine KE, Douglas AM, Ricchiuti N: Ischemia in isol...

We show that randomly-selected Reg SHO pilot firms respond to increased threats of short selling by significantly improving their employee relations. Pilot firms enhance employee security to reduce the likelihood of negative announcements that might attract short-selling interest. Consistent with expectations, we find that the largest employee-relation improvements occur among pilot firms that ...

The shape of the end-systolic tension-length relationship (ESTLR) changes when contractile state is changed, whereas the end-systolic pressure-volume relationship (ESPVR) remains linear despite changes in contractility. To investigate this disparity, the ESPVR was determined with contractility altered extensively by dobutamine, BAY K 8644, nifedipine, lowering coronary blood flow, and the intro...

The behavioral significance of changes in the cardiovascular system has been a major source of controversy in psychophysiology. In view of this, it is surprising that so few studies have examined the relationship between cardiac events and electrocortical (EEG) activity in human subjects. In the present study, this relationship was examined by comparing phase, amplitude and frequency of EEG act...

We use numerical simulations of turbulent, multiphase, self-gravitating gas orbiting in the disks of model galaxies to study the relationships among pressure, the vertical distribution of gas, and the relative proportions of dense and diffuse gas. A common assumption is that the interstellar medium (ISM) is in vertical hydrostatic equilibrium. We show that the disk height and mean midplane pres...

The stable and metastable melting relations for silicon in the diamond and Si136 clathrate-II structures at positive and negative pressures are calculated by molecular dynamics computer simulation. The simulated liquid and crystalline clathrates undergo cavitation at approximately -3 and -12 GPa. Between these limits a stretched crystal would transform directly to gas in response to a mechanica...

In 7 conscious dogs, left ventricular diastolic volume (V) was estimated by taking biplane cineradiographs with the left ventricular cavity previously outlined by permanent radiopaque markers. Left ventricular pressure (P) was measured with an implanted miniature transducer. There were two rapid filling periods during early and late diastole; little filling occurred during the middle third of d...

Conscious dogs were used to investigate the relations between aortic (Pa) pressure and coronary flow (F) during individual diastoles. When the dogs were in a semibasal state, coronary pressure-flow relations were described by a family of lines, and diastolic flow was a linear function of aortic pressure. For a given perfusion pressure, higher flows were associated with lines of progressively gr...

The kinetics of the hydrolysis of adenosine triphosphate (ATP) by the muscle protein myosin have received considerable attention in recent years, and several reviews have been devoted to this subject (Szent-Gyiirgyi, '55; Morales et al., '55; Buchthal et al., '56). The BTP-ase activity of myosin is modified by pressure (Laidler and Beardell, '55)' by calcium, magnesium and nucleotides (Blum, '5...