Partnership Schools

Agricultural intensification is one of the major drivers of biotic homogenization and has multiple levels ranging from within-field management intensity to landscape-scale simplification.The enhancement of invertebrate assemblages by establishing new, seminatural habitats, such as set-aside fields can improve biological pest control in adjacent crops, and mitigate the adverse effect of biotic homogenization.In this study we aimed to examine the effects of ecological intensification in winter wheat fields in Hungary.We tested how pests and their natural enemies were affected at different spatial scales by landscape composition (proportion of semi-natural habitats in the surrounding matrix), configuration (presence of adjacent set-aside fields), and local field management practices, such as fertilizer (NPK) applications without applying insecticides.We demonstrated that at the local scale, decreased fertilizer usage had no direct effect either on pests or their natural enemies.Higher landscape complexity and adjacent semi-natural habitats seem to be the major drivers of decreasing aphid abundance, suggesting that these enhanced the predatory insect assemblages.Additionally, the high yield in plots with no adjacent set-aside fields suggests that intensive management can compensate for the lower yields on the extensive plots.Our results demonstrated that although complexity at the landscape scale was crucial for maintaining invertebrate assemblages, divergence in their response to pests and pathogens could also be explained by different dispersal abilities.Although the landscape attributes acted as dispersal filters in the organization of pest and pathogen assemblages in croplands, the presence of set-aside fields negatively influenced aphid abundance due to their between-field isolation effect.

In 1822, New York became the first common-law state to authorize the formation of limited partnerships, and over the ensuing decades, many other states followed. Most prior research has suggested that these statutes were utilized only rarely, but little is known about their effects. Using newly collected data, this paper analyzes the use of the limited partnership in nineteenth-century New York City. We find that the limited partnership form was adopted by a surprising number of firms, and that limited partnerships had more capital, failed at lower rates, and were less likely to be formed on the basis of kinship ties, compared to ordinary partnerships. The latter differences were not simply due to selection: even though the merchants who invested in limited partnerships were a wealthy and successful elite, their own ordinary partnerships were quite different from their limited partnerships. The results suggest that the limited partnership facilitated investments outside kinship networks, and into the hands of talented young merchants.

We consider the nilpotent additions to classical trajectories in supersymmetric and nonsupersymmetric theories. The condition of anilpotence of action on some generalized solutions leads to the Witten supersymmetric Lagrangian. The condition of anilpotence of topological charge is the same as one of superpotential with spontaneous broken supersymmetry. We should vanish half of Grassmann constants of integration, because in this case only we obtain the same number of normalized bosonic and fermionic zero modes.