Mentoring, Policy and Politics

In this policy brief, former P/PV President Gary Walker asks, Is mentoring now a durable part of American social policy? If so is this unalloyed good news? Adapted from an article that first appeared in The Handbook of Youth Mentoring (DuBois and Karcher, ed. 2005), the brief reflects on the impact and appeal of mentoring, addresses various critiques of the movement and suggests future directions for mentorings application

Geography and Intra-National Home Bias: U.S. Domestic Trade in 1949 and 2007

This article examines home bias in U.S. domestic trade in 1949 and 2007. We use a unique data set of 1949 carload waybill statistics produced by the Interstate Commerce Commission, and 2007 Commodity Flow Survey data. The results show that home bias was considerably smaller in 1949 than in 2007 and that home bias in 1949 was even negative for several commodities. We argue that the difference between the geographical distribution of the manufacturing activities in 1949 and that of 2007 is an important factor explaining the differences in the magnitudes of home-bias estimates in those years

Geography and intra-national home bias : U.S. domestic trade in 1949 and 2007

This paper examines home bias in U.S. domestic trade in 1949 and 2007. We use a unique data set of 1949 carload waybill statistics produced by the Interstate Commerce Commission, and 2007 Commodity Flow Survey data. The results show that home bias was considerably smaller in 1949 than in 2007 and that home bias in 1949 was even negative for several commodities. We argue that the difference between the geographical distribution of the manufacturing activities in 1949 and that of 2007 is an important factor explaining the differences in the magnitudes of home-bias estimates in those years

Synthesis and cytotoxic activity of geranylmethoxyhydroquinone derivatives

Indexación: Web of Science; ScieloEl geranilo-2 ,4-sintético nuevo methoxyhydroquinone 1 y el conocido geranilo-4 ,5 methoxyhydroquinone- 2 se prepararon por sustitución electrófila aromática (EAS) reacciones entre geraniol y 1,3,5-trimethoxyphenol utilizando BF 3 · Et 2 O como un catalizador. Además, los nuevos derivados geranylmethoxyhydroquinones (3-6) se obtuvieron mediante transformaciones químicas de 1 y 2. Los compuestos se han evaluado por sus actividades citotóxicas contra PC-3 línea celular humana de cáncer de próstata, MCF 7-y humano MDA-MB-231 las células de cáncer de mama líneas y dengue hemorrágico cutánea fibroblastos humanos. IC 50 valores para los compuestos 1 y 5 varió en el nivel mu M 80.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072012000300005&lng=es&nrm=is

Phylloplane Sterilization With Bleach Does Not Reduce Btk Toxicity for \u3ci\u3ePapilio Glaucus\u3c/i\u3e Larvae (Lepidoptera: Papilionidae)

Neonate tiger swallowtail larvae (Papilio glaucus) were used to bioassay the effects of Btk (Bacillus thuringiensis var. kurstaki) at 4 doses (0.268, 0.034, 0.008, and 0.004 BIU per cm leaf surface) with an untreated control. Larvae, obtained from females captured in Georgia and North Carolina, were fed leaves of either tulip tree (Liriodendron tulipfera) or black cherry (Prunus serotina) in experiments that either included a pre-treatment dip and rinse in 5% chlorox bleach or not, before the application of Btk (dipping leaves in serially diluted solutions of Foray 48B). The results show no difference between North Carolina and Georgia P. glaucus larval dosage sensitivities, but do illustrate a clear dosage effect for all 4 treatments (cherry with and without bleach pre-treatment; tulip tree with and without bleach pre-treatment). The larvae on the bleached leaves do not do better (for cherry or tulip tree host plant) as would be expected if microbial symbionts on the phylloplane synergize the Btk toxicity. These results show that Btk (at doses several thousand-fold less than aerial sprays across forests for gypsy moth control) will kill P. glaucus, with or without microbial synergism on leaf phylloplanes

View-Invariant Object Category Learning, Recognition, and Search: How Spatial and Object Attention Are Coordinated Using Surface-Based Attentional Shrouds

Air Force Office of Scientific Research (F49620-01-1-0397); National Science Foundation (SBE-0354378); Office of Naval Research (N00014-01-1-0624

Male remating in Drosophila ananassae: evidence for interstrain variation for remating time and shorter duration of copulation in second mating

ABSTRACT—In Drosophila ananassae, male remating was studied using ten mass culture stocks which were initiated from flies collected from different geographic localities. Male remating occurs at a high fre-quency and varies within narrow limits (84–96 percent) in different strains. Interestingly, male remating time (in min) varies from 7.41 (Bhutan) to 21.59 (PAT) in different strains and the variation is highly significant. Further, the results also show that males copulate for shorter duration during second mating. This is the first report in the genus Drosophila which provides evidence for interstrain variations for male remating time as well as for shorter duration of copulation during second mating as compared to first mating in D. ananassae