53 research outputs found
An easily prepared graphene oxide-ionic liquid hybrid nanomaterial for micro-solid phase extraction and preconcentration of Hg in water samples
No full textA preconcentration method based on the use of graphene oxide (GO) functionalized with an ionic liquid (IL) was developed for trace Hg determination in water samples. The IL-GO hybrid nanomaterial was prepared by a simple procedure to functionalize GO with the IL 1-butyl-3-dodecylimidazolium bromide ([C4C12im]Br) and its performance as a sorption material for Hg was evaluated. A microcolumn filled with the IL-GO nanomaterial was used for preconcentration and determination of Hg followed by electrothermal atomic absorption spectrometry (ETAAS) detection. Mercury was retained at pH 5.0 and 20% (v/v) HNO3 was used for the elution of Hg from the microcolumn. The effects of different variables, including the sample volume, extraction time, sample flow rate, type and concentration of eluent and eluent flow rate were carefully studied. High retention efficiency (100%) was achieved with the proposed IL-GO sorption nanomaterial without the need for additional chelating reagents or derivatization reagents, which is an important advantage compared with traditional preconcentration methods. A sensitivity enhancement factor of 100 and a low detection limit of 14 ng L-1 were obtained under optimal experimental conditions. The proposed method can be considered as a simple, cost-effective and efficient alternative for Hg determination in water samples like river, rain, mineral and tap water.Fil: Cruz Sotolongo, Annaly. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo; ArgentinaFil: Martinis, Estefanía Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo; ArgentinaFil: Wuilloud, Rodolfo German. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Cuyo; Argentin
El maestro logopeda en la inclusión educativa de un escolar con retraso secundario del lenguaje
No full textTrabajo de Diploma titulado: El maestro logopeda en la inclusión educativa de
un escolar con retraso secundario del lenguaje de la autora Lisandra Fumero
Sotolongo, el trabajo surge a partir del interés profesional de la autora derivado
de las actividades acumuladas durante la práctica laboral investigativa a
diferentes instituciones educativas, para contribuir a la inclusión educativa de
un escolar con retraso secundario del lenguaje asociado a retraso mental, que
cursa el cuarto grado, en la escuela primaria Carlos Caraballo Barnet, del
municipio de Manicaragua. El trabajo tiene el propósito de ofrecer un sistema
de actividades para contribuir al desarrollo del proceso de inclusión a la
escuela primaria de dicho escolar. En el desarrollo del trabajo se aplicaron
diferentes métodos investigativos, del nivel teórico: el analítico-sintético,
inductivo deductivo, el histórico lógico y del nivel empírico: el análisis de
documentos, la observación y la entrevista. La propuesta de solución al
problema planteado se aplicó durante el curso escolar 2017- 2018 en la
institución antes mencionada. Posteriormente se sometió dicho sistema de
actividades a la valoración por especialistas de probada experiencia, quienes
aportaron criterios favorables sobre la calidad de la propuesta. Finalmente se
llevaron a la práctica las actividades contenidas en el sistema de actividades.
Los resultados alcanzados en el fortalecimiento del proceso de inclusión
educativa, revelaron la efectividad del sistema de actividades propuesto.
Palabras claves: Retraso mental, inclusión educativa, retraso secundario del
lenguaje, compensación, cualitativa, cuantitativa.Diploma work entitled: The master speech therapist in the educational inclusion
of a school with secondary delay in the language of the author Lisandra Fumero
Sotolongo, the work arises from the professional interest of the author derived
from the activities accumulated during the research work practice to different
educational institutions , to contribute to the educational inclusion of a school
with secondary delay of the language associated with mental retardation, which
is in the fourth grade, at the Carlos Caraballo Barnet elementary school, in the
municipality of Manicaragua. The work has the purpose of offering a system of
activities to contribute to the development of the inclusion process to the
primary school of said school. In the development of the work, different
investigative methods were applied, from the theoretical level: the analytic -synthetic, inductive deductive, the logical and empirical historical: document
analysis, observation and interview. The proposed solution to the problem was
applied during the school year 2017-2018 at the aforementioned institution.
Subsequently, this system of activities was subjected to assessment by
specialists of proven experience, who provided favorable criteria on the quality
of the proposal. Finally, the activities contained in the activity system were
carried out in practice. The results achieved in strengthening the process of
educational inclusion, revealed the effectiveness of the proposed activities
system.non-publishe
Modern Analytical Nanotechnologies for Beverages Quality Control
No full textConsumer expectations concerning the quality of beverages are more demanding nowadays. The determination of chemical and biological contaminants, whose concentrations are regulated by international standards, is one of the most important aspects of the quality of beverages. Additionally, the control of quality standards during all stages of the manufacturing process guarantees reliable products. Therefore, the analytical and sensorial quality control during production and distribution of beverages is being increasingly required and needs highly sensitive and reliable analytical methods. Application of nanotechnology based on novel materials is a powerful strategy to improve the performance of analytical methods. Moreover, nanotechnology could be integrated into operational processes or packaging to sense pesticides, heavy metals, and other contaminants. This chapter describes the different types of nanomaterials applied to the beverages quality control, their synthesis, manufacturing and characterization. Furthermore, state-of-the-art and future developments on nanotechnology applied to the chemical analysis involved during beverages production are discussed. Thus, colorimetric and electrochemical sensors, analytical sample preparation, chromatographic separations, etc. are evaluated. Likewise, nano-sensors used for packaging are also presented. Finally, the chapter provides future prospects and trends regarding the use of novel nanotechnology and nanomaterials for quality testing in beverage industry.Fil: Llaver, Mauricio. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de Química Analítica para Investigación y Desarrollo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; ArgentinaFil: Martinis, Estefanía Mabel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; ArgentinaFil: Cruz Sotolongo, Annaly. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de Química Analítica para Investigación y Desarrollo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; ArgentinaFil: Wuilloud, Rodolfo German. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de Química Analítica para Investigación y Desarrollo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; Argentin
The State of Utah v. Rodolfo Sotolongo : Brief of Appellant
No full textAppeal from ajudgment of conviction lor aggiavalcd assault, a thiicl dcgire felony in violation of Utah Code Annotated section 76-5-103(3) (1999), in the Third Judicial District Court, in and for Salt Lake County, State of Utah, the Honorable Robin W. Reese, presiding
The State of Utah v. Rodolfo Sotolongo : Brief of Appellee
No full textAPPEAL FROM A SENTENCE ENTERED ON A GUILTY PLEA TO AGGRAVATED ASSAULT, A THIRD DEGREE FELONY, IN VIOLATION OF UTAH CODE ANN. § 76-5-103(l)(b) (1999), IN THE THIRD JUDICIAL DISTRICT COURT, SALT LAKE COUNTY, STATE OF UTAH, THE HONORABLE ROBIN W. REESE PRESIDIN
The State of Utah v. Rodolfo Sotolongo : Reply Brief
No full textAppeal from a judgment of conviction for aggravated assault, a third degree felony in violation of Utah Code Annotated section 76-5-103(3) (1999), in the Third Judicial District Court, in and for Salt Lake County, State of Utah, the Honorable Robin W. Reese, presiding
Hybrid ionic liquid-3D graphene-Ni foam for on-line preconcentration and separation of Hg species in water with atomic fluorescence spectrometry detection
No full textA preconcentration method based on a novel hybrid sorption nanomaterial consisting in a 3D graphene-Ni foam functionalized with an ionic liquid (IL) was developed for Hg species determination. The capability of different phosphonium-ionic liquids (PILs) to functionalize the hybrid material and form ion-pairs with Hg(II) chlorocomplex was evaluated. A comparative study with PILs containing the trihexyl(tetradecyl)phosphonium cation but different anions (dicyanamide and decanoate) and trihexyl(tetradecyl)phosphonium chloride was performed. Inorganic Hg (InHg) species was selectively retained forming a chlorocomplex (HgCl4 2−) followed by its retention in a column filled with the IL-3D graphene-Ni foam material implemented in an on-line micro solid phase extraction system (μSPE). The elution of Hg from the column was performed with SnCl2, which was also used as reducing agent for subsequent detection by cold vapor generation atomic fluorescence spectrometry (CV-AFS). Organic mercury species (OrgHg) were not retained on the sorption material of the column. The effect of several parameters determining the efficiency of the preconcentration and detection system (sample loading and elution flow rate, sample volume, instrumental conditions, etc.) was investigated. A sensitivity enhancement factor (EF) of 180 was achieved for InHg. The detection limit obtained after the preconcentration of 100 mL of sample was 3.6 ng L−1 of InHg. The relative standard deviation (RSD) was 4.1% (at 1 μg L−1 InHg and n = 10) calculated from the peak height of the absorbance signals (Gaussian form and reproducible peaks). This work reports the first application of the IL-3D graphene-Ni foam in an on-line μSPE preconcentration system for the speciation analysis of Hg in mineral, tap, and river water samples.Fil: Cruz Sotolongo, Annaly. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de Química Analítica para Investigación y Desarrollo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; ArgentinaFil: Messina, María Mercedes. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Ibañez, Francisco Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; ArgentinaFil: Wuilloud, Rodolfo German. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales. Laboratorio de Química Analítica para Investigación y Desarrollo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Interdisciplinario de Ciencias Básicas. - Universidad Nacional de Cuyo. Instituto Interdisciplinario de Ciencias Básicas; Argentin
Capacidad de carga en suelos parcialmente saturados. Modelación computarizada 3D
No full textInvestigaciones recientes en el campo de la Mecánica de Suelos coinciden en
que las variaciones de humedad del suelo conducen a incrementos de la
capacidad de carga en suelos parcialmente saturados. Debido a esto dichas
investigaciones han estado encaminadas a la formulación de nuevas
expresiones que permitan realizar diseños geotécnicos más racionales de
acuerdo con estos incrementos.
En esta investigación se toma como base una de esas formulaciones basada en
una modificación de los parámetros de resistencia al corte: cohesión y ángulo de
fricción interna del suelo, y se trata de demostrar mediante un modelo
tridimensional el efecto de la succión matricial en el comportamiento del suelo,
haciendo uso de las técnicas de modelación estructural e implementando el
método de los elementos finitos.Recent investigations on the field of Soils Mechanic are agreed on the fact that
the moisture variations lead to an enhancement of the bearing capacity of
unsaturated soils. Due to this, those investigations had been on the way to
develop new expressions to make better geotechnical designs considering this
enhancement.
For this thesis is taken in account one of those new formulations based on a
modification of the yield shear criterion main parameters: cohesion and internal
friction angle. The author tries to prove, using a 3D model, the matrix sorption
effect on the behavior of soils using structural layout techniques and the finite
elements method.Facultad de Construcciones.Departamento de Ingeniería Civilnon-publishe
Development of analytic methods of separation-preconcentration with magnetic ionic liquids for the ultra-sensitive determination of trace elements
No full textEn el presente proyecto de investigación se propone el desarrollo de métodos analíticos modernos de alta sensibilidad, para la determinación y análisis de especiación de elementos traza. Para ello, se innovará en al diseño de nuevas técnicas de microextracción líquido-líquido (LLME) y de preconcentración, basadas en el uso de solventes de última generación denominados "Líquidos Iónicos Magnéticos" (MILs). Las técnicas de microextracción basadas en MILs serán fundamentales para obtener métodos analíticos de alta sensibilidad y selectividad al asociarse a detectores espectrométricos atómicos (AAS, AFS e ICP-MS). El proyecto contribuirá también con métodos que a la vez posean alto grado de sustentabilidad ambiental y se rijan por el concepto de la Química Verde ("Green Chemistry"), debido a la posibilidad que ofrecen los MILs de ser separados, recuperados y transportados por la aplicación de un campo magnético, abriendo nuevas posibilidades más allá del contexto analítico y vinculadas a tecnologías de separación inéditas. Se plantea la resolución de problemas usuales de las técnicas LLME, como son su escasa automatización y la necesidad de disponer de tediosas rutinas para la separación de fases, tales como la centrifugación, la cual insume tiempo considerable y reduce la Finalmente, los métodos analíticos desarrollados serán herramientas fundamentales para la obtención de datos concretos acerca de la calidad de recursos naturales (aguas de diverso origen) y alimentos (ajo, vinos, uvas y mosto) de importancia estratégica para el desarrollo social y productivo de la provincia de Mendoza.In this research project, it is proposed the development of modern high sensitivity analytical methods for the determination and analysis of speciation of trace elements. To do this, it will innovate in the design of new liquid-liquid microextraction (LLME) and pre-concentration techniques, based on the use of state-of-the-art solvents called "Magnetic Ionic Liquids" (MILs). The techniques of microextracción based on MILs will be fundamental to obtain analytical methods of high sensitivity and selectivity when associated with atomic spectrometric detectors (AAS, AFS and ICP-MS). The project will also contribute with methods that also have a high degree of environmental sustainability and are governed by the concept of Green Chemistry, due to the possibility offered by the MILs of being separated, recovered and transported by the application of a magnetic field, opening new possibilities beyond the analytical context and linked to unprecedented separation technologies. It is proposed to solve the usual problems of LLME techniques, such as its low automation and the need to have tedious routines for phase separation, such as centrifugation, which takes considerable time and reduces the analytical frequency.Finally, the analytical methods developed will be fundamental tools for obtaining specific data about the quality of natural resources (waters of different origin) and food (garlic, wines, grapes and must) of strategic importance for the social and productive development of the province of Mendoza
Reference Data for "Four-color single-molecule imaging with engineered tags resolves the molecular architecture of signaling complexes in the plasma membrane"
No full textReference data set for the single molecule co-tracking analysis presented in "Four-color single-molecule imaging with engineered tags resolves the molecular architecture of signaling complexes in the plasma membrane". Corresponding author for further inquiries:
Prof. Dr. Jacob Piehler
University of Osnabrück, Department of Biology/Chemistry, Division of Biophysics, Barbarastr. 11, 49076 Osnabrück, Germany
https://www.biophysik.uni-osnabrueck.de
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