BACKGROUND Hybridization between native and invasive species can facilitate introgression of native genes that increase invasive potential by providing exotic species with pre-adapted genes suitable for new environments. In this study we assessed the outcome of hybridization between native Senecio pinnatifolius var. pinnatifolius A.Rich. (dune ecotype) and invasive Senecio madagascariensis Poir...

Members of the Plasmodium falciparum var gene family encode clonally variant adhesins, which play an important role in the pathogenicity of tropical malaria. Here we employ a selective panning protocol to generate isogenic P.falciparum populations with defined adhesive phenotypes for CD36, ICAM-1 and CSA, expressing single and distinct var gene variants. This technique has established the frame...

Characterizing the communication behavior of larges cale ap p lications is a d iffi cult and cos tly tas k d ue to cod e/s y s tem comp lex ity and their long ex ecution times . A n alternative to running actual cod es is to gather their communication traces and then rep lay them, w hich facilitates ap p lication tuning and future p rocurements . W hile p as t ap p roaches lack ed los s les s s...

Let S = a1r1+a2r2+ · · ·+anrn be a weighted Rademacher sum. Friedgut, Kalai, and Naor have shown that if Var(|S|) is much smaller than Var(S), then the sum is largely determined by one of the summands. We provide a simple and elementary proof of this result, strengthen it, and extend it in various ways to a more general setting. ACM Classification: G.3 AMS Classification: 60E15, 42C10

Thermal death rate data were obtained for spores of Clostridium sporogenes P.A. 3679 and Bacillus subtilis var. niger, and for cells of Salmonella senftenberg 775W. The survival curves for P.A. 3679 were approximately linear, but for B. subtilis var. niger or S. senftenberg 775W they were sigmoidal. Decimal reduction times were derived from the regression slopes of the apparent linear portion o...

A series of bacteriophages, lytic for bacteria belonging to the genera Escherichia and Salmonella, were isolated. The phages were isolated from fecal samples, intestinal contents of turkey poults, and carrier cultures of S. typhimurium, S. typhimurium var copenhagen, S. heidelberg, and E. coli. The feasibility of using different habitats as sources of Salmonella phages was evaluated. The carrie...

Appendix A Deriving Equations for M+ME Biases and for t-statistic Overestimations Determining the Impact of VIF Bias on the t-statistic Consider first the situation where we have no measurement error. Using standard equations for the estimated standard error of β2 from any regression textbook, an unbiased and consistent estimate of the standard error is s = Σεi / (N – K) (A1-1) and the estimate...

New combinations and names are here validated for ten grass (Poaceae) taxa in California for the forthcoming revision of The Jepson Manual. In addition, guided by recent molecular phylogenetic studies, ten non-California grass species are here transferred to Muhlenbergia (Chloridoideae: Cynodonteae) to achieve monophyly of the genus. Lolium, long known to be phylogenetically nested within Festu...

The external validi ty o f artificial " t r iv ia l" laboratory set t ings is examined . Past v iews e m p h a s i z i n g general izabi l i ty o f relat ions a m o n g conceptua l var iables are rev iewed and affirmed. One major impl icat ion o f typical cha l lenges to the external validity o f laboratory research is tested with aggress ion research: If laboratory research is low in external ...

Alkaloid profiles of two Egyptian Senecio species (Senecio aegyptius var. discoideus and S. desfontainei) in addition to a cultivated species (S. cineraria) were studied using capillary GLC and GLC-mass spectrometry with respect to pyrrolizidine alkaloids (PAs). Four alkaloids were identified in S. aegyptius var. discoideus, 8 in S. desfontainei and 13 in S. cineraria. Some of these alkaloids h...