Brown Oso - Academia.edu (original) (raw)

Papers by Brown Oso

... Weakness in Comparative Post-Communist Perspective 75 Leslie Holmes 6. Putin and the Attenuat... more ... Weakness in Comparative Post-Communist Perspective 75 Leslie Holmes 6. Putin and the Attenuation of Russian Democracy 103 Timothy J. Colton 7. Majority Control and Executive Dominance: Parliament–President Relations in Putin's Russia 119 Paul Chaisty 8. Putin's ...

Experimental Cell Research, 1966

Conservation Biology, 2003

We developed a conceptual framework for classifying habitat quality that requires the constructio... more We developed a conceptual framework for classifying habitat quality that requires the construction of separate habitat models for each key demographic feature; the framework can be applied when the factors that determine different demographic processes differ substantially. For example, survival of large carnivores is mainly determined by human-induced mortality, whereas nutritional condition determines reproductive rate. Hence, a two-dimensional habitat model built for reproduction and survival yields five hypothetical habitat categories: matrix , with no reproduction and/or very high mortality; sink , with low reproduction and high mortality; refuge , with low reproduction and low mortality; attractive sink , with high reproduction and high mortality; and source , with high reproduction and low mortality. We applied this framework to two endangered brown bear ( Ursus arctos ) populations in the Cantabrian Mountains, Spain. Our aim was to generate working hypotheses about the quality and spatial arrangement of bear habitat to analyze the present conditions of the different population nuclei and to facilitate identification of core areas of high conservation value, conflictive areas, or areas with unoccupied potential habitat. We used a geographic information system and two spatial long-term data sets on presence and reproduction and performed logistic regressions for building a two-dimensional model. The analysis reveals that both populations exist under different suboptimal conditions: the eastern population mainly occupies areas of suboptimal natural habitat and relatively low human impact, whereas the western population is located mainly in areas with high human impact but otherwise good natural quality. To test hypotheses about demographic features of the obtained habitat categories, we classified data on historic extinction in northern Spain (fourteenth to nineteenth centuries) with the two-dimensional model. Extinction probabilities within each habitat category confirmed the hypotheses: most extinctions occurred in matrix habitat, and the fewest occurred in source habitat.

Environmental Earth Sciences

Contamination of soil, groundwater and surface water by atrazine is a worldwide concern. Arthroba... more Contamination of soil, groundwater and surface water by atrazine is a worldwide concern. Arthrobacter sp. HB-5 is a high-efficiency atrazine degradation strain isolated by our laboratory. Crude enzyme extracted from HB-5 and immobilized enzyme made from crude enzyme on sodium alginate were introduced to atrazine-polluted soils to evaluate the degrading ability for practical use and to calculate the kinetics of atrazine degradation. Atrazine was applied at 10 mg/kg of soil. Brown soil or cinnamon soil samples with crude or immobilized enzyme were incubated at 25°C. Samples were collected every 24 h from 0 to 144 h to extract the residual atrazine and analyzed using gas chromatography. Results showed, at 144 h, that only about 10% of the initially applied amount of atrazine was left in the two soils, except in the control soil samples without crude or immobilized enzyme. Before 48 h of incubation, crude enzyme removed atrazine faster than the immobilized enzyme in each soil sample. However, after 120 h, degradation of atrazine reached a similar level with either treatment. Atrazine seemed to be removed more easily from cinnamon soil than from brown soil, and both crude and immobilized enzyme could be used. However, the immobilized enzyme is preferred for its stability.

Page 1. Galemys, 18 (1-2): 3-17, 2006 ISSN: 1137-8700 3 TIPOLOGÍA, ESTACIONALIDAD, EVOLUCIÓN TEMP... more Page 1. Galemys, 18 (1-2): 3-17, 2006 ISSN: 1137-8700 3 TIPOLOGÍA, ESTACIONALIDAD, EVOLUCIÓN TEMPORAL Y DISTRIBUCIÓN ESPACIAL DE LOS DAÑOS ATRIBUIDOS AL OSO PARDO (Ursus arctos) EN LA PROVINCIA DE LEÓN (1974-2003) CÉSAR J. POLLO ...

... Weakness in Comparative Post-Communist Perspective 75 Leslie Holmes 6. Putin and the Attenuat... more ... Weakness in Comparative Post-Communist Perspective 75 Leslie Holmes 6. Putin and the Attenuation of Russian Democracy 103 Timothy J. Colton 7. Majority Control and Executive Dominance: Parliament–President Relations in Putin's Russia 119 Paul Chaisty 8. Putin's ...

Experimental Cell Research, 1966

Conservation Biology, 2003

We developed a conceptual framework for classifying habitat quality that requires the constructio... more We developed a conceptual framework for classifying habitat quality that requires the construction of separate habitat models for each key demographic feature; the framework can be applied when the factors that determine different demographic processes differ substantially. For example, survival of large carnivores is mainly determined by human-induced mortality, whereas nutritional condition determines reproductive rate. Hence, a two-dimensional habitat model built for reproduction and survival yields five hypothetical habitat categories: matrix , with no reproduction and/or very high mortality; sink , with low reproduction and high mortality; refuge , with low reproduction and low mortality; attractive sink , with high reproduction and high mortality; and source , with high reproduction and low mortality. We applied this framework to two endangered brown bear ( Ursus arctos ) populations in the Cantabrian Mountains, Spain. Our aim was to generate working hypotheses about the quality and spatial arrangement of bear habitat to analyze the present conditions of the different population nuclei and to facilitate identification of core areas of high conservation value, conflictive areas, or areas with unoccupied potential habitat. We used a geographic information system and two spatial long-term data sets on presence and reproduction and performed logistic regressions for building a two-dimensional model. The analysis reveals that both populations exist under different suboptimal conditions: the eastern population mainly occupies areas of suboptimal natural habitat and relatively low human impact, whereas the western population is located mainly in areas with high human impact but otherwise good natural quality. To test hypotheses about demographic features of the obtained habitat categories, we classified data on historic extinction in northern Spain (fourteenth to nineteenth centuries) with the two-dimensional model. Extinction probabilities within each habitat category confirmed the hypotheses: most extinctions occurred in matrix habitat, and the fewest occurred in source habitat.

Environmental Earth Sciences

Contamination of soil, groundwater and surface water by atrazine is a worldwide concern. Arthroba... more Contamination of soil, groundwater and surface water by atrazine is a worldwide concern. Arthrobacter sp. HB-5 is a high-efficiency atrazine degradation strain isolated by our laboratory. Crude enzyme extracted from HB-5 and immobilized enzyme made from crude enzyme on sodium alginate were introduced to atrazine-polluted soils to evaluate the degrading ability for practical use and to calculate the kinetics of atrazine degradation. Atrazine was applied at 10 mg/kg of soil. Brown soil or cinnamon soil samples with crude or immobilized enzyme were incubated at 25°C. Samples were collected every 24 h from 0 to 144 h to extract the residual atrazine and analyzed using gas chromatography. Results showed, at 144 h, that only about 10% of the initially applied amount of atrazine was left in the two soils, except in the control soil samples without crude or immobilized enzyme. Before 48 h of incubation, crude enzyme removed atrazine faster than the immobilized enzyme in each soil sample. However, after 120 h, degradation of atrazine reached a similar level with either treatment. Atrazine seemed to be removed more easily from cinnamon soil than from brown soil, and both crude and immobilized enzyme could be used. However, the immobilized enzyme is preferred for its stability.

Page 1. Galemys, 18 (1-2): 3-17, 2006 ISSN: 1137-8700 3 TIPOLOGÍA, ESTACIONALIDAD, EVOLUCIÓN TEMP... more Page 1. Galemys, 18 (1-2): 3-17, 2006 ISSN: 1137-8700 3 TIPOLOGÍA, ESTACIONALIDAD, EVOLUCIÓN TEMPORAL Y DISTRIBUCIÓN ESPACIAL DE LOS DAÑOS ATRIBUIDOS AL OSO PARDO (Ursus arctos) EN LA PROVINCIA DE LEÓN (1974-2003) CÉSAR J. POLLO ...