N=2 string amplitudes, when required to have the Lorentz covariance of the equivalent N=4 string, describe a self-dual form of N=4 super Yang-Mills in 2+2 dimensions. Spin-independent couplings and the ghost nature of SO(2,2) spacetime make it a topological-like theory with vanishing loop corrections.

On the cover : Steers grazing strips of rhizoma peanut ( Arachis glabrata Benth) and bahiagrass Paspalum notatum Flüggé) at North Florida Research Education Center, Marianna, FL, USA. See article, “Nutrient excretion from cattle nitrogen‐fertilized grass or grass‐legume pastures”, by Garcia et al. in this issue Agronomy Journal . Photo Credit: Liza Garcia. image

the present study aimed to assess pure planted species (i.e., alnus subcordata l., poplus deltoids l., taxadium distichum l. rich) and a mixed natural forest (i.e., dominated by quercus castaneifolia c. a. mey. - carpinus betulus l. - parrotia persica c. a. meyer) on basis of some soil quality indices in mazandaran province, northern iran. sixteen samples per stand were taken from the top 10 cm...

1Department of Neurobiology and Behavior, SUNY-Stony Brook, Stony Brook, NY 11794-5230, USA 2Graduate Program in Neuroscience, SUNY-Stony Brook, Stony Brook, NY 11794, USA 3State University of New York Eye Institute, Syracuse, NY 13202, USA 4The Whitney Laboratory for Marine Bioscience, University of Florida, St. Augustine, FL 32080, USA 5Department of Neuroscience, University of Florida, Gaine...