Spongomorpha pacifica biomass was evaluated as a new sorbent for Mo VI removal from aqueous solut... more Spongomorpha pacifica biomass was evaluated as a new sorbent for Mo VI removal from aqueous solution. The maximum sorption capacity was found to be 1.28 Â 10 6 ± 1 Â 10 4 mg kg À1 at 20°C and pH 2.0. Sorption kinetics and equilibrium studies followed pseudo-first order and Langmuir adsorption isotherm models, respectively. FTIR analysis revealed that carboxyl and hydroxyl groups were mainly responsible for the sorption of Mo VI . SEM images show that morphological changes occur at the biomass surface after Mo VI sorption. Activation parameters and mean free energies obtained with Dubinin-Radushkevich isotherm model demonstrate that the mechanism of sorption process was chemical sorption. Thermodynamic parameters demonstrate that the sorption process was spontaneous, endothermic and the driven force was entropic. The isosteric heat of sorption decreases with surface loading, indicating that S. pacifica has an energetically non-homogeneous surface. Experimental breakthrough curves were simulated by Thomas and modified dose-response models. The bed depth service time (BDST) model was employed to scale-up the continuous sorption experiments. The critical bed depth, Z 0 was determined to be 1.7 cm. S. pacifica biomass showed to be a good sorbent for Mo VI and it can be used in continuous treatment of effluent polluted with molybdate ions.
This article examines the experiences of faculty women of color at predominately White public res... more This article examines the experiences of faculty women of color at predominately White public research extensive universities. In the wake of legal challenges to affirmative action, such as Gratz and Grutter, and the proliferation of antiaffirmative action state "Civil Rights Initiatives," these issues become critically important. This study's central questions were, "What are the lived experiences of faculty women of color in predominately White institutions? " and "What are the implications of legal challenges to affirmative action, such as Gratz and Grutter, for faculty women of color and their institutions? " Twelve 90-min focus groups were conducted with 51 faculty women of color from a wide range of academic fields and disciplines, from all regions of the United States, and occupying tenured/tenure track ranks (assistant, associate, and full professors) to further understand their experiences, feelings, and reactions in light of the affirmative action Supreme Court cases. Critical Race Theory (CRT) and Critical Race Feminism (CRF) serve as frameworks to guide our analysis. One main finding is that faculty women of color across three disciplinary areas (Science, Technology, Engineering, and Mathematics [STEM], Social, Behavioral, and Economic Sciences [SBE], and Humanities/Arts) experience a knowledge gap on the impact of public policies on their everyday lives. Faculty women of color, along with experiencing the typically documented conditions of tokenism, also report that communication about diversity initiatives and resources on their own campuses was extremely uneven and idiosyncratic.
This study describes the development of a model for predicting footwear fit on the basis of user ... more This study describes the development of a model for predicting footwear fit on the basis of user data. The model involved the design of a footwear classification system which grouped different types of footwear into classes on the basis of functional features. Foot dimensions of a total of 316 female participants were measured with a 3D scanner and individual preferences
To better prepare students for an increasingly diverse society, campuses across the country remai... more To better prepare students for an increasingly diverse society, campuses across the country remain engaged in efforts to diversify the racial and ethnic makeup of their faculties. However, faculty of color remain seriously underrepresented, making up 17% of total full-time faculty. In the past 20 years, more than 300 authors have addressed the status and experience of faculty of color in academe. From 1988 to 2007, there was a continued rise in publications addressing the issue of the low representation of faculty of color. This article presents a literature review and synthesis of 252 publications, with the goal of informing scholars and practitioners of the current state of the field. Themes emerging from these publications and an interpretive model through which findings can be viewed are presented. The analysis, with a focus on the departmental, institutional, and national contexts, documents supports, challenges, and recommendations to address barriers and build on successes within these 3 contexts. The authors hope that this article informs researchers and practitioners as they continue their work to understand and promote the increased representation of faculty of color.
Journal of the Chemical Society, Dalton Transactions, 2000
... α-D-glucopyranoside and methyl α-D-mannopyranoside Sandra Signorella,a María Inés Frascaroli... more ... α-D-glucopyranoside and methyl α-D-mannopyranoside Sandra Signorella,a María Inés Frascaroli,a Silvia García,a Mabel Santoro,a Juan Carlos González,a Claudia Palopoli,a Verónica Daier,a Nieves Casadob and Luis F. Sala *a ...
Epileptic disorders : international epilepsy journal with videotape, 2014
Aim. To determine whether there is added benefit in detecting electrographic abnormalities from 1... more Aim. To determine whether there is added benefit in detecting electrographic abnormalities from 16-24 hours of continuous video-EEG in adult medical/surgical ICU patients, compared to a 30-minute EEG. Methods. This was a prospectively enroled non-randomized study of 130 consecutive ICU patients for whom EEG was requested. For 117 patients, a 30-minute EEG was requested for altered mental state and/or suspected seizures; 83 patients continued with continuous video-EEG for 16-24 hours and 34 patients had only the 30-minute EEG. For 13 patients with prior seizures, continuous video-EEG was requested and was carried out for 16-24 hours. We gathered EEG data prospectively, and reviewed the medical records retrospectively to assess the impact of continuous video-EEG. Results. A total of 83 continuous video-EEG recordings were performed for 16-24 hours beyond 30 minutes of routine EEG. All were slow, and 34% showed epileptiform findings in the first 30 minutes, including 2% with seizures. ...
Selective oxidation of carboxylate groups present in alginic acid by Cr VI affords CO 2 , oxidize... more Selective oxidation of carboxylate groups present in alginic acid by Cr VI affords CO 2 , oxidized alginic acid, and Cr III as final products. The redox reaction afforded first-order kinetics in [alginic acid], [Cr VI ], and [H + ], at fixed ionic strength and temperature. Kinetic studies showed that the redox reaction proceeds through a mechanism which combines Cr VI →Cr IV → Cr II and Cr VI → Cr IV → Cr III pathways. The mechanism was supported by the observation of free radicals, CrO 2 2+ and Cr V as reaction intermediates. The reduction of Cr IV and Cr V by alginic acid was independently studied and it was found to occur more than 10 3 times faster than alginic acid/Cr VI reaction, in acid media. At pH 1-3, oxo-chromate(V)-alginic acid species remain in solution during several hours at 15 • C. The results showed that this abundant structural polysaccharide present on brown seaweeds is able to reduce Cr VI/V/IV or stabilize high-valent chromium depending on pH value.
The authors propose a system for the assessment of Final Year Projects (FYPs) whose educational o... more The authors propose a system for the assessment of Final Year Projects (FYPs) whose educational outputs have been defined previously in terms of competences. For building the proposal, eleven pre-defined competences were ranked and a different weight was assigned to each one. The ranking was made individually by all the authors following a blind two-step process. The first step consisted in ordering the competences by relevance and the second step in grading that relevance for each pair of competences having consecutive positions in the list. As a result, an overall weight was computed for each competence and the final proposal was produced by averaging the individual proposals. In addition, three moments are defined for the assessment of FYPs: the FYP process itself, the written report and the oral presentation. Bearing in mind this, the competences that can be evaluated in each moment are identified and a specific assessment form for each moment is also proposed.
Laccases are copper-containing enzymes involved in the degradation of lignocellulosic materials a... more Laccases are copper-containing enzymes involved in the degradation of lignocellulosic materials and used in the treatment of phenol-containing wastewater. In this study we investigated the effect of culture conditions, i.e. submerged or semi-solid, and copper supplementation on laccase production by Trametespubescens grown on coffee husk, soybean pod husk, or cedar sawdust. The highest specific laccase activity was achieved when the culture was conducted under submerged conditions supplemented with copper (5 mM), and using coffee husk as substrate. The crude extracts presented two laccase isoforms with molecular mass of 120 (Lac1) and 60 kDa (Lac2). Regardless of the substrate, enzymatic crude extract and purified fractions behaved similarly at different temperatures and pHs, most of them presented the maximum activity at 55 °C and a pH range between 2 and 3. In addition, they showed similar stability and electro-chemical properties. At optimal culture conditions laccase activity wa...
At 40.4 million strong (14% of the US population; US Bureau of the Census 2005), Latinas/os are t... more At 40.4 million strong (14% of the US population; US Bureau of the Census 2005), Latinas/os are the largest and fastest growing US ethnic minority group. In the last 15 years, since the Los Angeles riots of 1992, Anglo perceptions that the Latina/o population is too large, growing ...
Non-chromatographic speciation approaches have been developed for determination of water-soluble ... more Non-chromatographic speciation approaches have been developed for determination of water-soluble and phosphate-exchangeable As(III) and As(V) in certified reference materials of coal fly ash and sediments by FI-HGAAS. A 2IV6–2 fractional factorial design was employed for screening optimisation of the flow injection manifold. A simple two-stage sequential extraction protocol involving deionized water and a phosphate buffer as extractants was employed. Determination
Little progress has been made to increase Latina/o faculty representation in theological educatio... more Little progress has been made to increase Latina/o faculty representation in theological education. In this study, 33 interviews with Latina/o theological faculty identify supports and challenges to their scholarly development. Latino critical theory guides the analysis. Narratives reveal faculty experiences with oppression, challenging dominant ideology, commitment to social justice, and the use of their experiential knowledge in academe. A discussion
... 1995; O'Regan & Nöe 2001); and given appropriate technological devices and training ... more ... 1995; O'Regan & Nöe 2001); and given appropriate technological devices and training ... True, each channel (including hybrid ones resulting from sensory substitution) has distinct (anatomical, physiologi-cal ... for it can be argued that qualia are functional and do provide information ...
To determine the per patient and overall cost of illness of type 2 diabetes mellitus (T2DM) in Co... more To determine the per patient and overall cost of illness of type 2 diabetes mellitus (T2DM) in Colombia from Ministry of Health and societal perspectives. A published Markov transition model was adapted for Colombia, using the clinical expertise of a Colombian endocrinologist. Transition probabilities for the model were derived from an international literature review. A model was run for a time horizon of 42 years. Direct resources (drugs, laboratory, medical, hospital, other health care) were identified and cost was ascertained by using national price lists, international health care guidelines, and other Colombian studies or data from other countries. Indirect costs (work time lost) were calculated by using the human capital approach. Annual and lifetime direct and indirect costs, in 2007 U.S. dollars with a 5% discount rate, were determined on a per patient basis and projected to the overall Colombian population. Costs were clustered according to treatments and outcomes. The estimated annual cost was $2.7 billion from the societal perspective and $921 million from the Ministry of Health perspective. The annual direct cost per patient was $288, and the indirect cost was $559 (total = $847). This cost was distributed across disease outcomes as follows: diabetes treatment (drugs), 47%; cardiac and coronary disease, 24%; stroke, 15%; amputation, 9%; nephropathy, 3%; retinopathy, 2%. Macrovascular complications made up 86% of the annual direct costs and 95% of the annual indirect costs of T2DM. We estimated the annual cost of T2DM for Colombia from societal, Ministry of Health, and Colombian Health System perspectives. We also estimated annual direct cost per patient and the cost of treating diabetes and macrovascular complications. The economic burden is substantial and comparable to results for other countries. The model showed a logical disease progression.
093040) demonstrated that the two-dimensional (2D) Maxwell fish eye (MFE) lens can focus perfectl... more 093040) demonstrated that the two-dimensional (2D) Maxwell fish eye (MFE) lens can focus perfectly 2D Helmholtz waves of arbitrary frequency; that is, it can transport perfectly an outward (monopole) 2D Helmholtz wave field, generated by a point source, towards a 'perfect point drain' located at the corresponding image point. Moreover, a prototype with λ/5 super-resolution property for one microwave frequency has been manufactured and tested (Ma et al 2010 arXiv:1007.2530v1; Ma et al 2010 New J. Phys. 13 033016). However, neither software simulations nor experimental measurements for a broad band of frequencies have yet been reported. Here, we present steady-state simulations with a non-perfect drain for a device equivalent to the MFE, called the spherical geodesic waveguide (SGW), which predicts up to λ/500 super-resolution close to discrete frequencies. Out of these frequencies, the SGW does not show super-resolution in the analysis carried out.
Spongomorpha pacifica biomass was evaluated as a new sorbent for Mo VI removal from aqueous solut... more Spongomorpha pacifica biomass was evaluated as a new sorbent for Mo VI removal from aqueous solution. The maximum sorption capacity was found to be 1.28 Â 10 6 ± 1 Â 10 4 mg kg À1 at 20°C and pH 2.0. Sorption kinetics and equilibrium studies followed pseudo-first order and Langmuir adsorption isotherm models, respectively. FTIR analysis revealed that carboxyl and hydroxyl groups were mainly responsible for the sorption of Mo VI . SEM images show that morphological changes occur at the biomass surface after Mo VI sorption. Activation parameters and mean free energies obtained with Dubinin-Radushkevich isotherm model demonstrate that the mechanism of sorption process was chemical sorption. Thermodynamic parameters demonstrate that the sorption process was spontaneous, endothermic and the driven force was entropic. The isosteric heat of sorption decreases with surface loading, indicating that S. pacifica has an energetically non-homogeneous surface. Experimental breakthrough curves were simulated by Thomas and modified dose-response models. The bed depth service time (BDST) model was employed to scale-up the continuous sorption experiments. The critical bed depth, Z 0 was determined to be 1.7 cm. S. pacifica biomass showed to be a good sorbent for Mo VI and it can be used in continuous treatment of effluent polluted with molybdate ions.
This article examines the experiences of faculty women of color at predominately White public res... more This article examines the experiences of faculty women of color at predominately White public research extensive universities. In the wake of legal challenges to affirmative action, such as Gratz and Grutter, and the proliferation of antiaffirmative action state "Civil Rights Initiatives," these issues become critically important. This study's central questions were, "What are the lived experiences of faculty women of color in predominately White institutions? " and "What are the implications of legal challenges to affirmative action, such as Gratz and Grutter, for faculty women of color and their institutions? " Twelve 90-min focus groups were conducted with 51 faculty women of color from a wide range of academic fields and disciplines, from all regions of the United States, and occupying tenured/tenure track ranks (assistant, associate, and full professors) to further understand their experiences, feelings, and reactions in light of the affirmative action Supreme Court cases. Critical Race Theory (CRT) and Critical Race Feminism (CRF) serve as frameworks to guide our analysis. One main finding is that faculty women of color across three disciplinary areas (Science, Technology, Engineering, and Mathematics [STEM], Social, Behavioral, and Economic Sciences [SBE], and Humanities/Arts) experience a knowledge gap on the impact of public policies on their everyday lives. Faculty women of color, along with experiencing the typically documented conditions of tokenism, also report that communication about diversity initiatives and resources on their own campuses was extremely uneven and idiosyncratic.
This study describes the development of a model for predicting footwear fit on the basis of user ... more This study describes the development of a model for predicting footwear fit on the basis of user data. The model involved the design of a footwear classification system which grouped different types of footwear into classes on the basis of functional features. Foot dimensions of a total of 316 female participants were measured with a 3D scanner and individual preferences
To better prepare students for an increasingly diverse society, campuses across the country remai... more To better prepare students for an increasingly diverse society, campuses across the country remain engaged in efforts to diversify the racial and ethnic makeup of their faculties. However, faculty of color remain seriously underrepresented, making up 17% of total full-time faculty. In the past 20 years, more than 300 authors have addressed the status and experience of faculty of color in academe. From 1988 to 2007, there was a continued rise in publications addressing the issue of the low representation of faculty of color. This article presents a literature review and synthesis of 252 publications, with the goal of informing scholars and practitioners of the current state of the field. Themes emerging from these publications and an interpretive model through which findings can be viewed are presented. The analysis, with a focus on the departmental, institutional, and national contexts, documents supports, challenges, and recommendations to address barriers and build on successes within these 3 contexts. The authors hope that this article informs researchers and practitioners as they continue their work to understand and promote the increased representation of faculty of color.
Journal of the Chemical Society, Dalton Transactions, 2000
... α-D-glucopyranoside and methyl α-D-mannopyranoside Sandra Signorella,a María Inés Frascaroli... more ... α-D-glucopyranoside and methyl α-D-mannopyranoside Sandra Signorella,a María Inés Frascaroli,a Silvia García,a Mabel Santoro,a Juan Carlos González,a Claudia Palopoli,a Verónica Daier,a Nieves Casadob and Luis F. Sala *a ...
Epileptic disorders : international epilepsy journal with videotape, 2014
Aim. To determine whether there is added benefit in detecting electrographic abnormalities from 1... more Aim. To determine whether there is added benefit in detecting electrographic abnormalities from 16-24 hours of continuous video-EEG in adult medical/surgical ICU patients, compared to a 30-minute EEG. Methods. This was a prospectively enroled non-randomized study of 130 consecutive ICU patients for whom EEG was requested. For 117 patients, a 30-minute EEG was requested for altered mental state and/or suspected seizures; 83 patients continued with continuous video-EEG for 16-24 hours and 34 patients had only the 30-minute EEG. For 13 patients with prior seizures, continuous video-EEG was requested and was carried out for 16-24 hours. We gathered EEG data prospectively, and reviewed the medical records retrospectively to assess the impact of continuous video-EEG. Results. A total of 83 continuous video-EEG recordings were performed for 16-24 hours beyond 30 minutes of routine EEG. All were slow, and 34% showed epileptiform findings in the first 30 minutes, including 2% with seizures. ...
Selective oxidation of carboxylate groups present in alginic acid by Cr VI affords CO 2 , oxidize... more Selective oxidation of carboxylate groups present in alginic acid by Cr VI affords CO 2 , oxidized alginic acid, and Cr III as final products. The redox reaction afforded first-order kinetics in [alginic acid], [Cr VI ], and [H + ], at fixed ionic strength and temperature. Kinetic studies showed that the redox reaction proceeds through a mechanism which combines Cr VI →Cr IV → Cr II and Cr VI → Cr IV → Cr III pathways. The mechanism was supported by the observation of free radicals, CrO 2 2+ and Cr V as reaction intermediates. The reduction of Cr IV and Cr V by alginic acid was independently studied and it was found to occur more than 10 3 times faster than alginic acid/Cr VI reaction, in acid media. At pH 1-3, oxo-chromate(V)-alginic acid species remain in solution during several hours at 15 • C. The results showed that this abundant structural polysaccharide present on brown seaweeds is able to reduce Cr VI/V/IV or stabilize high-valent chromium depending on pH value.
The authors propose a system for the assessment of Final Year Projects (FYPs) whose educational o... more The authors propose a system for the assessment of Final Year Projects (FYPs) whose educational outputs have been defined previously in terms of competences. For building the proposal, eleven pre-defined competences were ranked and a different weight was assigned to each one. The ranking was made individually by all the authors following a blind two-step process. The first step consisted in ordering the competences by relevance and the second step in grading that relevance for each pair of competences having consecutive positions in the list. As a result, an overall weight was computed for each competence and the final proposal was produced by averaging the individual proposals. In addition, three moments are defined for the assessment of FYPs: the FYP process itself, the written report and the oral presentation. Bearing in mind this, the competences that can be evaluated in each moment are identified and a specific assessment form for each moment is also proposed.
Laccases are copper-containing enzymes involved in the degradation of lignocellulosic materials a... more Laccases are copper-containing enzymes involved in the degradation of lignocellulosic materials and used in the treatment of phenol-containing wastewater. In this study we investigated the effect of culture conditions, i.e. submerged or semi-solid, and copper supplementation on laccase production by Trametespubescens grown on coffee husk, soybean pod husk, or cedar sawdust. The highest specific laccase activity was achieved when the culture was conducted under submerged conditions supplemented with copper (5 mM), and using coffee husk as substrate. The crude extracts presented two laccase isoforms with molecular mass of 120 (Lac1) and 60 kDa (Lac2). Regardless of the substrate, enzymatic crude extract and purified fractions behaved similarly at different temperatures and pHs, most of them presented the maximum activity at 55 °C and a pH range between 2 and 3. In addition, they showed similar stability and electro-chemical properties. At optimal culture conditions laccase activity wa...
At 40.4 million strong (14% of the US population; US Bureau of the Census 2005), Latinas/os are t... more At 40.4 million strong (14% of the US population; US Bureau of the Census 2005), Latinas/os are the largest and fastest growing US ethnic minority group. In the last 15 years, since the Los Angeles riots of 1992, Anglo perceptions that the Latina/o population is too large, growing ...
Non-chromatographic speciation approaches have been developed for determination of water-soluble ... more Non-chromatographic speciation approaches have been developed for determination of water-soluble and phosphate-exchangeable As(III) and As(V) in certified reference materials of coal fly ash and sediments by FI-HGAAS. A 2IV6–2 fractional factorial design was employed for screening optimisation of the flow injection manifold. A simple two-stage sequential extraction protocol involving deionized water and a phosphate buffer as extractants was employed. Determination
Little progress has been made to increase Latina/o faculty representation in theological educatio... more Little progress has been made to increase Latina/o faculty representation in theological education. In this study, 33 interviews with Latina/o theological faculty identify supports and challenges to their scholarly development. Latino critical theory guides the analysis. Narratives reveal faculty experiences with oppression, challenging dominant ideology, commitment to social justice, and the use of their experiential knowledge in academe. A discussion
... 1995; O'Regan & Nöe 2001); and given appropriate technological devices and training ... more ... 1995; O'Regan & Nöe 2001); and given appropriate technological devices and training ... True, each channel (including hybrid ones resulting from sensory substitution) has distinct (anatomical, physiologi-cal ... for it can be argued that qualia are functional and do provide information ...
To determine the per patient and overall cost of illness of type 2 diabetes mellitus (T2DM) in Co... more To determine the per patient and overall cost of illness of type 2 diabetes mellitus (T2DM) in Colombia from Ministry of Health and societal perspectives. A published Markov transition model was adapted for Colombia, using the clinical expertise of a Colombian endocrinologist. Transition probabilities for the model were derived from an international literature review. A model was run for a time horizon of 42 years. Direct resources (drugs, laboratory, medical, hospital, other health care) were identified and cost was ascertained by using national price lists, international health care guidelines, and other Colombian studies or data from other countries. Indirect costs (work time lost) were calculated by using the human capital approach. Annual and lifetime direct and indirect costs, in 2007 U.S. dollars with a 5% discount rate, were determined on a per patient basis and projected to the overall Colombian population. Costs were clustered according to treatments and outcomes. The estimated annual cost was $2.7 billion from the societal perspective and $921 million from the Ministry of Health perspective. The annual direct cost per patient was $288, and the indirect cost was $559 (total = $847). This cost was distributed across disease outcomes as follows: diabetes treatment (drugs), 47%; cardiac and coronary disease, 24%; stroke, 15%; amputation, 9%; nephropathy, 3%; retinopathy, 2%. Macrovascular complications made up 86% of the annual direct costs and 95% of the annual indirect costs of T2DM. We estimated the annual cost of T2DM for Colombia from societal, Ministry of Health, and Colombian Health System perspectives. We also estimated annual direct cost per patient and the cost of treating diabetes and macrovascular complications. The economic burden is substantial and comparable to results for other countries. The model showed a logical disease progression.
093040) demonstrated that the two-dimensional (2D) Maxwell fish eye (MFE) lens can focus perfectl... more 093040) demonstrated that the two-dimensional (2D) Maxwell fish eye (MFE) lens can focus perfectly 2D Helmholtz waves of arbitrary frequency; that is, it can transport perfectly an outward (monopole) 2D Helmholtz wave field, generated by a point source, towards a 'perfect point drain' located at the corresponding image point. Moreover, a prototype with λ/5 super-resolution property for one microwave frequency has been manufactured and tested (Ma et al 2010 arXiv:1007.2530v1; Ma et al 2010 New J. Phys. 13 033016). However, neither software simulations nor experimental measurements for a broad band of frequencies have yet been reported. Here, we present steady-state simulations with a non-perfect drain for a device equivalent to the MFE, called the spherical geodesic waveguide (SGW), which predicts up to λ/500 super-resolution close to discrete frequencies. Out of these frequencies, the SGW does not show super-resolution in the analysis carried out.
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Papers by JUAN GONZALEZ