title: Co-contaminants and factors affecting the sorption behaviour of two sulfonamides in pasture soils

authors: Srinivasan, Prakash

subjects: veterinary antibiotics

abstract: We investigated the effect of soil pH, organic carbon, ionic strength and steroid hormones on the sorption of sulfamethoxazole (SMO) and sulfachloropyridazine (SCP) in three pastoral soils of New Zealand. A model linking sorbate speciation with species-specific sorption coefficients describing the pH dependence of the apparent sorption coefficients was used to derive the fraction of each species of SMO. All soils displayed a decrease in sorption when pH was increased, with SMO exhibiting the highest sorption at pH 2. The cationic form of SMO appeared to sorb more close to pH ≥ pKa1 and, when pH ≥ pKa2 (6.5, 7.5 and 8.5) the anionic species seems to dominate, however, its sorption affinity to all soils was low. SMO sorption was affected by ionic strengths and organic carbon content, while the presence of hormones showed only a subtle decrease in SCP sorption in a selected model pasture soil.

text: Co-contaminants and factors affecting the sorption behaviour of two sulfonamides in pasture soils We investigated the effect of soil pH, organic carbon, ionic strength and steroid hormones on the sorption of sulfamethoxazole (SMO) and sulfachloropyridazine (SCP) in three pastoral soils of New Zealand. A model linking sorbate speciation with species-specific sorption coefficients describing the pH dependence of the apparent sorption coefficients was used to derive the fraction of each species of SMO. All soils displayed a decrease in sorption when pH was increased, with SMO exhibiting the highest sorption at pH 2. The cationic form of SMO appeared to sorb more close to pH ≥ pKa1 and, when pH ≥ pKa2 (6.5, 7.5 and 8.5) the anionic species seems to dominate, however, its sorption affinity to all soils was low. SMO sorption was affected by ionic strengths and organic carbon content, while the presence of hormones showed only a subtle decrease in SCP sorption in a selected model pasture soil.

year: 2013

title: “All you can eat” ontology-building: Feeding Wikipedia to Cyc

authors: Sarjant, Samuel

subjects: ontologies

abstract: In order to achieve genuine web intelligence, building some kind of large general machine-readable conceptual scheme (i.e. ontology) seems inescapable. Yet the past 20 years have shown that manual ontology-building is not practicable. The recent explosion of free user-supplied knowledge on the Web has led to great strides in automatic ontology building,
but quality-control is still a major issue. Ideally one should automatically build onto an already intelligent base. We suggest that the long-running Cyc project is able to assist here. We describe methods used to add 35K new concepts mined from Wikipedia to collections in ResearchCyc entirely automatically. Evaluation with 22 human subjects shows high precision both for the new concepts’ categorization, and their assignment as individuals or collections. Most importantly we show how Cyc itself can be leveraged for ontological quality control by ‘feeding’ it assertions one by one, enabling it to reject those that contradict its other knowledge.

text: “All you can eat” ontology-building: Feeding Wikipedia to Cyc In order to achieve genuine web intelligence, building some kind of large general machine-readable conceptual scheme (i.e. ontology) seems inescapable. Yet the past 20 years have shown that manual ontology-building is not practicable. The recent explosion of free user-supplied knowledge on the Web has led to great strides in automatic ontology building,
but quality-control is still a major issue. Ideally one should automatically build onto an already intelligent base. We suggest that the long-running Cyc project is able to assist here. We describe methods used to add 35K new concepts mined from Wikipedia to collections in ResearchCyc entirely automatically. Evaluation with 22 human subjects shows high precision both for the new concepts’ categorization, and their assignment as individuals or collections. Most importantly we show how Cyc itself can be leveraged for ontological quality control by ‘feeding’ it assertions one by one, enabling it to reject those that contradict its other knowledge.

year: 2009

title: Addressing the context and complexity of indigenous language revitalization

authors: May, Stephen

subjects: revitilization

abstract: This response discusses six key themes that emerge, either explicitly or implicitly, from Nancy Hornberger's exemplary analysis of the challenges facing indigenous language revitalization initiatives, particularly as they are currently expressed and implemented in three key indigenous language education contexts--Quechua in the South American Andes; Guarani in Paraguay and Maori in Aotearoa/New Zealand. These themes include, first, the importance of recognizing the wider social and political contexts within which indigenous revitalization initiatives are invariably situated. Second, it requires a related recognition of the internationalism of these initiatives. Third, any academic analysis of indigenous language revitalization requires, or at least must benefit from, an interdisciplinary approach, as exemplified by Hornberger's own analysis. Fourth, Hornberger's continua of biliteracy provides a sufficiently robust framework to explore the complexities and interrelationships inevitably involved in the articulation of language revitalization efforts, as well as how individuals and groups are situated in relation to those efforts. Fifth, the ongoing challenges and tensions inherent in indigenous language revitalization efforts need to continue to be discussed candidly, in order for them to be seriously addressed and, where possible, resolved. And finally, the importance of recognizing and including the voices of those centrally involved in these initiatives, as Hornberger again does, is a crucial feature, as well as a reflection of the inclusive, emancipatory aims of indigenous language revitalization itself.

text: Addressing the context and complexity of indigenous language revitalization This response discusses six key themes that emerge, either explicitly or implicitly, from Nancy Hornberger's exemplary analysis of the challenges facing indigenous language revitalization initiatives, particularly as they are currently expressed and implemented in three key indigenous language education contexts--Quechua in the South American Andes; Guarani in Paraguay and Maori in Aotearoa/New Zealand. These themes include, first, the importance of recognizing the wider social and political contexts within which indigenous revitalization initiatives are invariably situated. Second, it requires a related recognition of the internationalism of these initiatives. Third, any academic analysis of indigenous language revitalization requires, or at least must benefit from, an interdisciplinary approach, as exemplified by Hornberger's own analysis. Fourth, Hornberger's continua of biliteracy provides a sufficiently robust framework to explore the complexities and interrelationships inevitably involved in the articulation of language revitalization efforts, as well as how individuals and groups are situated in relation to those efforts. Fifth, the ongoing challenges and tensions inherent in indigenous language revitalization efforts need to continue to be discussed candidly, in order for them to be seriously addressed and, where possible, resolved. And finally, the importance of recognizing and including the voices of those centrally involved in these initiatives, as Hornberger again does, is a crucial feature, as well as a reflection of the inclusive, emancipatory aims of indigenous language revitalization itself.

year: 2006-01-01