Io's radar properties

Arecibo 13 cm wavelength radar observations during 1987-90 have yielded echoes from Io on each of 11 dates. Whereas Voyager imaged parts of the satellite at resolutions of several km and various visible/infrared measurements have probed the surfaces's microscale properties, the radar data yield new information about the nature of the surface at cm to km scales. Our observations provide fairly thorough coverage and reveal significant heterogeneity in Io's radar properties. A figure is given showing sums of echo spectra from 11 dates

Confrontation Confronted

The following article is an edited version of the amicus curiae brief filed with the Supreme Court of the United States in the October Term, 1998, in the case of Benjamin Lee Lilly v. Commonwealth of Virginia(No.98-5881). This case raises important questions about the confrontation clause, which has been a vital ingredient of the fair trial right for hundreds of years, Professor Richard Friedman and his co-authors say. In particular, this case presents the Court with an opportunity to reconsider the relationship between the confrontation clause and the law of hearsay. On June 10 the Court handed down a decision in favor of Lilly. Justice Stephen Breyer, a member of the plurality, wrote a concurring opinion citing this brief favorably and suggested that a future case might call for the Court to adopt its approach

Confrontation Confronted

The following article is an edited version of the amicus curiae brief filed with the Supreme Court of the United States in the October Term, 1998, in the case of Benjamin Lee Lilly v. Commonwealth of Virginia (No. 98-5881). This case raises important questions about the meaning of the confrontation clause, which has been a vital ingredient of the fair trial right for hundreds of years, Professor Richard Friedman and his co-authors say. In particular, this case presents the Court with an opportunity to reconsider the relationship between the confrontation clause and the law of hearsay. On June 10 the Court handed down a decision in favor of Lilly. Justice Stephen Breyer, a member of the plurality, wrote a concurring opinion citing this brief favorably and suggested that a future case might call for the Court to adopt its approach

Allosteric modulation of beta1 integrin function induces lung repair in animal model of emphysema.

Emphysema is a progressive lung disease characterised by loss of lung parenchyma with associated functional changes including decreased tissue elastance. Here we report beta1 integrin is a novel target for tissue repair and regeneration in emphysema. We show a single dose of a monoclonal antibody against beta1 integrin induced both functional and structural reversal of elastase-induced lung injury in vivo, and we found that similar matrix remodelling changes occurred in human lung tissue. We also identified a potential mechanism of action as this allosteric modulation of beta1 integrin inhibited elastase-induced caspase activation, F-actin aggregate formation and changes in cellular ATP levels. This was accompanied by maintenance of beta1?integrin levels and inhibition of caveolin-1 phosphorylation. We propose that allosteric modulation of beta1 integrin-mediated mechanosensing prevents cell death associated with lung injury and progressive emphysema, thus allowing cells to survive and for repair and regeneration to ensue

Asteroid 1986 DA: Radar evidence for a metallic composition

Radar observations of the near-Earth asteroid 1986 DA were carried out at the Arecibo Observatory in April 1986, two months after its discovery. Radar results are consistent with the hypothesis that 1986 HA is a piece of NiFe metal derived from the interior of a much larger object that melted, differentiated, cooled and subsequently was disrupted in a catastrophic collision. This 2-km asteroid might be (or have been part of) the parent body of some iron meteorites. Or 1986 DA might share the parentage and/or part of the dynamical history of some meteorites without ever having contributed any of its own ejecta to our meteorite sample. Analysis of the samples returned from 1986 DA might ultimately involve economic considerations. Meteoritic metal is mostly iron with about 8 percent nickel, but also contains substantial concentrations of precious and strategic metals, including approx. 1 ppm of gold and approx. 10 ppm of platinum group elements. If these abundances apply to 1986 DA, it contains some 10(exp 16) g of iron, 10 (exp 15) g of nickel, 10(exp 11) g of platinum group metals, and 10(exp 10) g of gold

G02-1466 Determining the Need to Fertilize Landscape Trees and Shrubs (Revised March 2004)

Most Nebraska soils are fertile enough to support tree and shrub growth without applying fertilizer. However, when woody plants exhibit poor growth or reduced vigor, yet have had adequate moisture and are not experiencing pest problems or other environmental limitations, the proper applicatin of fertilizer may be necessary. This NebGuide explains how to determine if fertilization of established trees and shrubs is required and how to apply the needed amount

Unraveling disruptions: how employees pick up signals of change

Psychological contracts reside in the eye of the beholder and capture the employee-employer exchange relationship. It is a dynamic relationship as employees deliberately manage and change their psychological contract over time. Triggers seem to be the drivers underpinning this dynamism. Yet little is known about how these triggers operate and affect the psychological contract. To address this, we explore triggers and their impact using a 6-week daily diary study (N = 117). We found a linear chain of positive relationships from initial triggers to connectedness of past triggers, to the experience of negative emotions, to the expected reoccurrence of the initial trigger, ultimately disrupting the psychological contract. The findings revealed the dynamic effect of triggers on the employment relationship, not only by exposing the underlying micro-processes, but also by revealing that the impact of triggers can linger for approximately 11 days before leveling off. These findings suggest that the psychological contract may fluctuate on a daily basis due to the influence of triggers. The theoretical implications for understanding the dynamic nature of the psychological contract are discussed in relation to the disruptive role of triggers

Evolution and the Expression of Biases: Situational Value Changes the Endowment Effect

Cognitive and behavioral biases, which are widespread among humans, have recently been demonstrated in other primates, suggesting a common origin. Here we examine whether the expression of one shared bias, the endowment effect, varies as a function of context. We tested whether objects lacking inherent value elicited a stronger endowment effect (or preference for keeping the object) in a context in which the objects had immediate instrumental value for obtaining valuable resources (food). Chimpanzee subjects had opportunities to trade tools when food was not present, visible but unobtainable, and obtainable using the tools. We found that the endowment effect for these tools existed only when they were useful, showing that the effect varies as a function of context-specific utility. Such context-specific variation suggests that the variation seen in some human biases may trace predictably to behaviors that evolved to maximize gains in specific circumstances