Valuing setting-based recreation for selected visitors to national forests in the southern United States.

In this study we estimate selected visitors' demand and value for recreational trips to settings such as developed vs. undeveloped sites in U.S.

An Economic Valuation of Biotic Pollination Services in Georgia.

As agriculture faces documented decline in bees and other insect pollinators, empirical assessments of potential economic losses are critical for contextualizing the impacts of this decline and for prioritizing research needs. For the state of Georgia, we show that the annual economic value of biotic pollinators is substantial--US$367 million, equivalent to 13 percent of the total production value of crops studied and 3 percent of the total production value of Georgia's agricultural sector. Our unique Geographic Information Systems analysis reveals an irregular pattern of vulnerability.

Observation of Wakefields and Resonances in Coherent Synchrotron Radiation.

We report on high resolution measurements of resonances in the spectrum of coherent synchrotron radiation (CSR) at the Canadian Light Source (CLS). The resonances permeate the spectrum at wave number intervals of 0.074  cm(-1), and are highly stable under changes in the machine setup (energy, bucket filling pattern, CSR in bursting or continuous mode).

Elastic compton scattering from the deuteron and nucleon polarizabilities.

Cross sections for elastic Compton scattering from the deuteron were measured over the laboratory angles straight theta(gamma) = 35 degrees -150 degrees. Tagged photons in the laboratory energy range E(gamma) = 84-105 MeV were scattered from liquid deuterium and detected in the large-volume Boston University NaI spectrometer. Using the calculations of Levchuk and L'vov, along with the measured differential cross sections, the isospin-averaged nucleon polarizabilities in the deuteron were estimated.

Platelet function as an assay for uremic toxins.

The nature of the toxins responsible for the uremic syndrome remains a mystery. There is current interest, however, in the possible role of middle molecular weight (500-3000 daltons) retention products and elevated hormonal factors, e.g.