Queen's University

About: Queen's University is a education organization based out in Kingston, Ontario, Canada. It is known for research contribution in the topics: Population & Poison control. The organization has 41065 authors who have published 78811 publications receiving 2864794 citations. The organization is also known as: Queen's College at Kingston.

Mercaptopropyl-Modified Mesoporous Silica: A Remarkable Support for the Preparation of a Reusable, Heterogeneous Palladium Catalyst for Coupling Reactions

Abstract: The functionalization of SBA-15 with mercaptopropyl trimethoxysilane leads to a material capable of absorbing Pd from organic and aqueous solutions. The resulting Pd-loaded material acts as a catalyst for the Suzuki−Miyaura and Mizoroki−Heck coupling reactions. Leaching studies show that the filtrate contains as little as 3 ppb Pd after reaction. Aminopropylated silica is an effective scavenger, and catalyst for the Mizoroki−Heck reaction, but leaching is significant (35 ppm), illustrating the importance of the thiol ligand to retain Pd on the surface. Heterogeneity tests such as hot filtration experiments and three-phase tests show that the reaction is occurring predominantly via surface-bound Pd.

Ethnicity, patronage and the african state: the politics of uncivil nationalism

Abstract: Recent research has revealed that modern African ethnicity is a social construction of the colonial period through the reactions of pre-colonial societies to the social, economic, cultural and political forces of colonialism. Ethnicity is the product of a continuing historical process, always simultaneously old and new, grounded in the past and perpetually in creation. Colonial states were grounded in the alliances with local 'Big Men', incorporating ethnically-defined administrative units linked to the local population by incorporation of pre-colonial patron-client relations. This was reinforced by European assumptions of neatly bounded and culturally homogeneous 'tribes' and a bureaucratic preoccupation with demarcating, classifying and counting subject populations, as well as by the activities of missionaries and anthropologists. African ethnic invention emerged through internal struggles over moral economy and political legitimacy tied to the definition of ethnic communities—moral ethnicity; and external conflicts over differential access to the resources of modernity and economic accumulation—political tribalism. Ethnicities were, in particular, the creations of elites seeking the basis for a conservative modernization. The colonial legacy of bureaucratic authoritarianism, pervasive patron-client relations, and a complex ethnic dialectic of assimilation, fragmentation and competition has persisted in post-colonial societies. Patron-client networks remain the fundamental state-society linkage in circumstances of social crisis and uncertainty and have extended to the very centre of the state. This accounts for the personalistic, materialistic and opportunistic character of African politics. Such networks also penetrate institutions of civil society and liberal democracy, undermining programmes of socio-economic and political reform.

NICAD: Accurate Detection of Near-Miss Intentional Clones Using Flexible Pretty-Printing and Code Normalization

Abstract: This paper examines the effectiveness of a new language- specific parser-based but lightweight clone detection approach. Exploiting a novel application of a source transformation system, the method accurately finds near-miss clones using an efficient text line comparison technique. The transformation system assists the method in three ways. First, using agile parsing it provides user-specified flexible pretty- printing to remove noise, standardize formatting and break program statements into parts such that potential changes can be detected as simple linewise text differences. Second, it provides efficient flexible extraction of potential clones to be compared using island grammars and agile parsing to select granularities and enumerate potential clones. Third, using transformation rules it provides flexible code normalization to allow for local editing differences between similar code segments and filtering out of uninteresting parts of potential clones. In this paper we introduce the theory and practice of the framework and demonstrate its use in finding function clones in C code. Early experiments indicate that the method is capable of finding near-miss clones with high precision and recall, and with reasonable performance.

Plant mating systems in a changing world.

Abstract: There is increasing evidence that human disturbance can negatively impact plant–pollinator interactions such as outcross pollination. We present a meta-analysis of 22 studies involving 27 plant species showing a significant reduction in the proportion of seeds outcrossed in response to anthropogenic habitat modifications. We discuss the evolutionary consequences of disturbance on plant mating systems, and in particular whether reproductive assurance through selfing effectively compensates for reduced outcrossing. The extent to which disturbance reduces pollinator versus mate availability could generate diverse selective forces on reproductive traits. Investigating how anthropogenic change influences plant mating will lead to new opportunities for better understanding of how mating systems evolve, as well as of the ecological and evolutionary consequences of human activities and how to mitigate them.