Influence of native roadside plants on biological control of Iowa crop pests

Boundaries between cropland and natural plant communities provide food, water, and cover for wildlife. Similarly, field borders com­ posed of natural plant communities, especially those that include flowering plants, may have a marked effect on natural enemies of crop pests within crop fields. Monoculture crops typical of much of the Midwest do not provide adequate sources of food (nectar, pollen) or shelter and breeding sites for these natural enemies. Nectar and pollen are produced by a variety of native Midwestern plants; as these plants flower in succession throughout the growing season, they provide a continuous food source for the natural enemies (parasites) of pests attacking adjacent crops

Sea Control in the Arctic: A Soviet Perspective

In the Punic Wars, Hannibal surprised and strategically dislocated the Roman legions by attacking them with his war elephants as he made his way across what had been considered to be an insurmountable geographical barrier, the Alps. In a similar fashion, recent developments in Soviet Arctic mobility and logistics give the Soviets the capability to inflict strategic surprise on the West. Although there is no evidence that the Soviets intend to implement the strategic plans or concepts of operations discussed here, they do possess substantial capabilities in the Arctic which could threaten the United States and Canada. U.S. and Canadian strategists must consider these capabilities in determining our territorial defense plans and our Arctic defense forces

Rainfall and Grazing Impacts on the Population Dynamics of \u3cem\u3eBothriochloa ewartiana\u3c/em\u3e in Tropical Australia

Bothriochloa ewartiana (desert bluegrass) is a palatable, native perennial (C4) grass of considerable importance to the northern Australian grazing industry. However, little is known of the interaction between grazing pressure and the highly variable rainfall found in this area, on its population dynamics. This paper reports interim results (1998-2004) from a long-term study, in which its population dynamics were examined under 3 grazing strategies

The Tropical Grassland Society of Australia Incorporated

The Tropical Grassland Society of Australia was formed in 1962 and became incorporated in 1987 and has the following aims: To publicise information of interest to primary producers and scientists To improve the relevance of research and adoption of technology through the flow of ideas between scientists and producers To publicise the findings of Australian pasture research and development to overseas workers, and to draw on their experience for application in Australi

A computational triage approach to the synthesis of novel difluorocyclopentenes and fluorinated cycloheptadienes using thermal rearrangements

Electronic structure calculations have been used for the effective triage of substituent effects on difluorinated vinylcyclopropane precursors and their ability to undergo vinyl cyclopropane rearrangements (VCPR). Groups which effectively stabilised radicals, specifically heteroarenes, were found to result in the lowest energy barriers. Ten novel precursors were synthesised to test the accuracy of computational predictions; the most reactive species which contained heteroarenes underwent thermal rearrangements at room temperature to afford novel difluorocyclopentenes and fluorinated benzocycloheptadienes through competing VCPR and [3,3]-rearrangement pathways, respectively. More controlled rearrangement of ethyl 3-(1’(2’2’-difluoro-3’benzo[d][1,3]dioxol-5-yl)cyclopropyl) propenoate (22) allowed these competing pathways to be monitored at the same time and activation energies for both reactions were determined; Ea(VCPR) = (23.4 ± 0.2) kcal mol-1 and Ea([3,3]) = (24.9 ± 0.3) kcal mol-1. Comparing our calculated activation energies with these parameters showed that no single method stood out as the most accurate for predicting barrier heights; (U)M05-2X/6-31+G* methodology remained the best for VCPR but M06-2X/6-31G* was better for the [3,3]-rearrangement. The consistency observed with (U)B3LYP/6-31G* calculations meant that it came closest to a universal method for dealing with these systems. The developed computational design model correctly predicted the observed selectivity of rearrangement pathways for both our system and literature compounds

Reduced dimensionality spin-orbit dynamics of CH3 + HCl reversible arrow CH4 Cl on ab initio surfaces

A reduced dimensionality quantum scattering method is extended to the study of spin-orbit nonadiabatic transitions in the CH3 + HCl reversible arrow CH4 + Cl(P-2(J)) reaction. Three two-dimensional potential energy surfaces are developed by fitting a 29 parameter double-Morse function to CCSD(T)/IB//MP2/cc-pV(T+d)Z-dk ab initio data; interaction between surfaces is described by geometry-dependent spin-orbit coupling functions fit to MCSCF/cc-pV(T+d)Z-dk ab initio data. Spectator modes are treated adiabatically via inclusion of curvilinear projected frequencies. The total scattering wave function is expanded in a vibronic basis set and close-coupled equations are solved via R-matrix propagation. Ground state thermal rate constants for forward and reverse reactions agree well with experiment. Multi-surface reaction probabilities, integral cross sections, and initial-state selected branching ratios all highlight the importance of vibrational energy in mediating nonadiabatic transition. Electronically excited state dynamics are seen to play a small but significant role as consistent with experimental conclusions. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592732

Life after armed group involvement in Nepal: a clinical ethnography of psychological well-being of former 'child soldiers' over time

Little is known about the longitudinal effects of early age involvement of young people in armed groups and their well-being as they return to strongly affected, politicised communities. Current research and policy are often driven by the assumption of a causal relationship between participation in this war experience and psychological damage. This article explores the role of young people’s armed group experience during the Nepal People’s War, compared with post-conflict stressors, in shaping intra-psychic impact and distress, and which processes enable well-being and resilient functioning. Findings are reported from an 18-month clinical ethnography of a cohort of 17 Nepalese young subjects, where participant-observation methods were used to explore their daily lives after exiting the armed group and follow-up research conducted six years later. The findings highlighted limited evidence for on-going intra-psychic impact and distress related directly to their armed group experience; when such distress occurred, it appeared to be generated more by the structural violence of their environments. The key constituents determining their well-being included: a sense of closeness through emotional connectedness with their family, ideological proximity with the values of the armed group, closeness in their bond with the community, and the social-emotional-economic capital available to them to navigate the harsh structural constraints of post-conflict life. These data further challenge the prevailing assumption that this war experience inevitably leads to psychological damage, and the article argues that structural violence often plays a predominant role in cases where psychological distress does arise