The molecular mechanisms which guide development of the heart, in vertebrates and many other species, have been the subject of intense investigation in recent years (Fishman and Chien, 1997; Olson and Srivastava, 1996). These studies have suggested common molecular pathways which are evolutionarily conserved from simpler species such as Drosophila to higher species including mammals (Bodmer and...

Disentangling the causal impact of media reporting from the impact of the events being reported is challenging. We solve this problem by comparing the behaviors of investors with access to different media coverage of the same information event. We use zip codes to identify 19 mutually exclusive trading regions corresponding with large U.S. cities. For all earnings announcements of S&P 500 Index...

Management-By-Walking-Around (MBWA) is a widely adopted technique in hospitals that involves senior managers directly observing frontline work. However, few studies have rigorously examined its impact on organizational outcomes. This paper examines an improvement program based on MBWA in which senior managers observe frontline employees, solicit ideas about improvement opportunities, and work w...

We show empirically a series of sharp patterns in stock market fluctuations, trading activity and their contemporaneous relationships. We link together and explain the following facts: (i) the cubic law of returns: returns follow a power law distribution with exponent 3. This “cubic” law seems to hold both across time and internationally. Stock market “crashes” (e.g. the 1929 and 1987 crashes) ...

We present a multiperiod agency model of stock based executive compensation in a speculative stock market, where investors have heterogeneous beliefs and stock prices may deviate from underlying fundamentals and include a speculative option component. This component arises from the option to sell the stock in the future to potentially overoptimistic investors. We show that optimal compensation ...

One striking development associated with the explosion of e-commerce is the increased transparency of sellers’quality history. In this paper we analyze how this affects firms’incentives to invest in quality when the outcome of investment is uncertain. We identify two conflicting effects. On the one hand, reducing the consumer’s cost of search for quality exacerbates the negative effects of past...

CHERNIACK, NEIL S., NORMAN H. EDELMAN, AND ALFRED P. FISHMAN. Pattern of discharge of respiratory neurons during systemic vasomotor waves. Am. J. Physiol. 217(5) : 1375-l 383. 1969.Systemic blood pressure oscillations, produced in paralyzed dogs by arresting ventilation or by hemorrhage during mechanical ventilation, were related to the phasic phrenic nerve electrical activity. Oscillations syn...

BACKGROUND Many researchers have reported relationships between the calcification stages of individual teeth and skeletal maturity. A few studies are available in the literature about Indian populations. In view of this fact, this study was conducted to investigate the relationship between the dental calcification stages and skeletal maturity stages among North-Indian individuals. The objective...

Senior manager participation is a key success driver for process improvement programs. To increase their participation, we designed an intervention in which senior managers worked with frontline staff to identify and solve safety-related problems over an 18-month period. On average, the 20 randomly selected treatment hospitals identified 17.3 problems per work area and solved 9.1 of these. Howe...

[1] Strong electric fields associated with lightning generate brief (∼1 ms) but intense Terrestrial Gamma‐ray Flashes (TGFs), detected by spacecrafts. A few events are thought to be the signature of a relativistic electron beam escaping the atmosphere, which is distinguishable from a TGF since the lightning discharge is along the geomagnetic field line from the spacecraft, rather than below. We...