Corrientes, Argentina

University of Cuenca del Plata
Corrientes, Argentina

The River Plate Basin University is a non-profit private university founded in 1991. Located in the province of Corrientes, Argentina, it has an undergraduate enrollment of 1,100 students and a graduate enrollment of 600.The university is focused primarily on social science and engineering. The undergraduates majors available are accountancy, business administration, law, humanities. Wikipedia.

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Lobayan R.M.,University of Cuenca del Plata | Torre A.,University of the Basque Country | Lain L.,University of the Basque Country
Journal of Chemical Theory and Computation | Year: 2011

This article provides a detailed study of the structure and bonding in closo-borane cluster compounds X 2B 3H 3 (X = BH -, P, SiH, CH, N), with particular emphasis on the description of the electron distribution using the topology of the quantum many-body effectively unpaired density. The close relationship observed between the critical points of this quantity and the localization of the electron cloud allows us to characterize the nonclassical bonding patterns of these systems. The obtained results confirm the suitability of the local rule to detect three-center two-electron bonds, which was conjectured in our previous study on boron hydrides. © 2011 American Chemical Society.

Landini F.,CONICET | Landini F.,University of Cuenca del Plata | Landini F.,University of Morón
Journal of Rural Studies | Year: 2016

Quality rural extension is of utmost importance for generating food security and sustainable rural development. In this paper, Argentine rural extensionists' point of view on how to be a good practitioner is described, as well as compared to good practices proposed by scholars and international development organizations. Forty rural extensionists from the Northeastern Argentine provinces were interviewed (29 men, 11 women). Interviews were recorded and transcribed, texts were categorized and contents analyzed. Scholars and extensionists, despite agreeing to most of the same principles, frame their recommendations for good extension practices in different ways. The former's recommendations tend to be supported by multiple case studies and focused on best practices on the level of extension projects or policies, while the latter's tend to draw upon their own experience and develop proposals more concerned with interpersonal interactions and with overcoming practical problems in real (and not ideal) settings.Best extension practices depend on environmental, institutional, political and cultural contexts, this implying there is no best extension practice in general. Training extensionists in interpersonal skills and in social sciences is key for reaching good extension results. Horizontal communication between farmers and extensionists, negotiation over best technologies, and helping farmers reflect on their productive practices are extension strategies with great potential. © 2015 Elsevier Ltd.

Landini F.,National Council of Scientific and Technological Research | Landini F.,University of Buenos Aires | Landini F.,University of Cuenca del Plata | Landini F.,University of Morón
American Journal of Community Psychology | Year: 2015

During the last decade, rural extension has received interest as being a key tool for rural development. Despite rural extension being affected by many psychosocial processes, psychology has made scarce contributions to it. An investigation was conducted with the aim of gaining knowledge of rural extensionists’ expectations of psychology, as well as to contribute to shaping community psychologists’ role in the context of rural extension . 652 extensionists from 12 Latin American countries were surveyed. The survey included closed socio-demographic questions as well as open ones addressing extension practice and psychologists’ potential contributions. 90.6 % of surveyed extensionists considered psychology could help them improve their practice. Most mentioned areas of contribution go in line with community psychology, including managing farmers groups, facilitating participatory processes and training extensionists; while others, such as the expectation of changing farmers’ mindset and increasing the adoption of external technologies, go against its principles. Thus, in some cases, extensionists’ expectations could help generate an interesting interaction between community psychology and rural extension, while in others, they need to be put up for discussion. In brief, community psychology has the potential to contribute to rural extension, but it needs to acknowledge extension practice as an interesting area for intervention. © 2015, Society for Community Research and Action.

Spotti M.J.,National University of Santa | Perduca M.J.,University of Cuenca del Plata | Piagentini A.,National University of Santa | Santiago L.G.,National University of Santa | And 2 more authors.
Food Hydrocolloids | Year: 2013

Maillard reaction (MR) is one of the most studied methods to improve the functional properties of proteins so as to turn them into better food ingredients. The mechanical properties of whey protein isolate (WPI)/dextran (DX) mixed and conjugate (obtained by MR) gels were investigated. Dextrans with different molecular weight (MW: 6, 40 and 70 kDa) and various concentrations (3.6, 7.2 and 10.8% w/w) were studied. WPI/DX conjugates were obtained by controlled dry heating (60 °C and 0.63 aw for 5 days). A decrease in the content of free amino group and an increase in colour parameters of WPI/DX conjugate systems revealed that MR had a higher progress for the lowest DX molecular weight and for the highest DX concentration. The mechanical properties (at the fracture point) of WPI/DX mixed gels were affected by DX concentration. On the other hand, unlike mixed gels, WPI/DX conjugate gels showed no fracture under the test conditions (80% deformation). © 2013 Elsevier Ltd.

Spotti M.J.,National University of Santa | Perduca M.J.,University of Cuenca del Plata | Piagentini A.,National University of Santa | Santiago L.G.,National University of Santa | And 2 more authors.
Food Hydrocolloids | Year: 2013

The effect of Maillard reaction on the mechanical properties of whey protein isolate (WPI) heat-induced gels was evaluated. WPI and dextran (15-25 kDa) conjugates were obtained by controlled dry heating during storage at 60 °C and 63% relative humidity for 2, 5 and 9 days. Changes in browning intensity and content of free amino groups were used to estimate the Maillard reaction. A decrease in free amino groups of WPI was observed when increasing polysaccharide concentration and reaction time. An increase in both a* and b* CIE Lab colour parameters indicated the development of a reddish-brown colour, typical of the Maillard reaction. Uniaxial compression and stress relaxation tests were performed to measure the mechanical properties of mixed and conjugate gels. Maillard reaction significantly modified the mechanical properties of WPI/DX gels, and even prevented fracture when conjugate gels were subjected to 80% deformation in uniaxial compression test. © 2012 Elsevier Ltd.

Grosso A.L.,National University of San Luis | Torres J.M.T.,National University of San Luis | Torres J.M.T.,University of Cuenca del Plata
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

We introduce a restriction of second order logic, SO F , for finite structures. In this restriction the quantifiers range over relations closed by the equivalence relation ≡ FO . In this equivalence relation the equivalence classes are formed by κ-tuples whose First Order type is the same, for some integer κ≤1. This logic is a proper extension of the logic SO ω defined by A. Dawar and further studied by F. Ferrarotti and the second author. In the existential fragment of SO F,∑ 1 1,F, we can express rigidity, which cannot be expressed in SO ω . We define the complexity class NP F by using a variation of the relational machine of S. Abiteboul and V. Vianu (RMF) and we prove that this complexity class is captured by ∑ 1 1,F. Then we define an RMF k machine with a relational oracle and show the exact correspondence between prenex fragments of SO F and the levels of the PHF polynomial-time hierarchy. © 2012 Springer-Verlag Berlin Heidelberg.

Bentz E.N.,University of Cuenca del Plata
Journal of molecular modeling | Year: 2014

We report a study of the structure of (+)-catechin, which belongs to the family of the flavan-3-ols-one of the five most widely distributed phenolic groups. The biological activities and pharmaceutical utility of these compounds are related to antioxidant activity due to their ability to scavenge free radicals. A breakthrough in the study of the conformational space of this compound, so far absent in the literature, is presented herein. A detailed analysis of the electronic distribution, charge delocalization effects, and stereoelectronic effects is presented following application of the theory of atoms in molecules (AIM) and natural bond orbital analysis. The stability order, and the effects of electron delocalization in the structures were analyzed in depth. The molecular electrostatic potential (MEP) was also obtained, assessing changes in the electronic distribution in aqueous solution, the effects of the solvent on the intrinsic electronic properties, and molecular geometry. The effect of the aqueous solvent on MEP was also quantified, and rationalized by charge delocalization mechanisms, relating them to structural changes and topological properties of the electronic charge density. To further analyze the effects of the aqueous solvent, as well as investigating the molecular and structural properties of these compounds in a biological environment, the polarizabilities for all conformers characterized were also calculated. All results were interpreted on the basis of our accumulated knowledge on (4α→6", 2α→O→1")-phenylflavans in previous reports, thus enriching and deepening the analysis of both types of structure.

Landini F.,University of Cuenca del Plata
Journal of Agricultural Education and Extension | Year: 2016

Purpose: In this paper, the knowledge dynamics of the farmer–rural extensionist’ interface were explored from extensionists’ perspective with the aim of understanding the matchmaking processes between supply and demand of extension services at the micro-level. Design/methodology/approach: Forty semi-structured interviews were conducted with extensionists whom work in the North-Eastern, Argentine provinces. Findings: Two different, general types of knowledge dynamics were identified: one moderately diffusionist, based on a hierarchical relationship and the prioritisation of experts’ knowledge, and the other constructivist, based on horizontal processes of co-construction. Interestingly, some extensionists support beliefs pertaining to both approaches. They also highlight the importance of unceremonious trainings, interpersonal trust and making recommendations that take into account farmers’ rationale. Practical implications: Results show the persistence of diffusionist rural extension and that extensionists have different, even contradictory, extension approaches, which renders inappropriate any attempt to generalise their perspectives. Theoretical implications: This study suggests that farmers’ demand is the result of a constructive, interactive process, and thus is not prior to the interaction between the demand side (farmers) and the supply side (extensionists). Consequently, the knowledge and power dynamics that take place within the farmer–extensionist interface should be considered the nucleus of demand construction and the matchmaking process. Originality/value: This paper addresses the dynamic matchmaking process between supply and demand of extension services at the micro-level, suggesting it is a constructive process and showing the core role played by power dynamics. © 2016 Wageningen University

Perez Schmit M.C.,University of Cuenca del Plata | Jubert A.H.,National University of La Plata | Vitale A.,University of Buenos Aires | Lobayan R.M.,University of Cuenca del Plata
Journal of Molecular Modeling | Year: 2011

The conformational space of 1H-Indole-3-Acetic Acid (IAA) was scanned using molecular dynamics at semiempirical level, and complemented with functional density calculations at B3LYP/6-31G**level, 14 conformers of lowest energy were obtained. Electronic distributions were analyzed at a higher calculation level, thus improving the basis set (B3LYP/6-311++G**). A topological study based on Bader's theory (AIM: atoms in molecules) and natural bond orbital (NBO) framework performed with the aim to analyze the stability and reactivity of the conformers allowed the understanding of electronic aspects relevant in the study of the antioxidant properties of IAA. Intramolecular hydrogen bonds were found and were characterized as blue-shifting hydrogen bonding interactions. Furthermore, molecular electrostatic potential maps (MEPs) were obtained and analyzed in the light of AIM and NBO results, thus showing subtle but essential features related not only to reactivity but also with intramolecular weak interactions, charge delocalization and structure stabilization. © 2010 Springer-Verlag.

Bentz E.N.,University of Cuenca del Plata | Jubert A.H.,National University of La Plata | Pomilio A.B.,University of Buenos Aires | Lobayan R.M.,University of Cuenca del Plata
Journal of Molecular Modeling | Year: 2010

The stereochemistry of A-type dimeric proanthocyanidins was studied, focusing on the factors that determine it, and the changes that occur with R = OCH3, R' = H, and R = OH, R' = H as substituents, starting with the study of the conformational space of each species. Using molecular dynamics at a semiempirical level, and complementing with functional density calculations, two conformers of lowest energy were characterized for R = H, eight conformers for R = OH, and three conformers for R = OCH3. Electronic distributions were analyzed at a higher calculation level, thus improving the basis set. Intramolecular interactions were examined and characterized by the theory of atoms in molecules (AIM). Detailed natural bond orbitals (NBO) analysis allowed the description of subtle stereoelectronic aspects of fundamental importance for understanding the stabilization and antioxidant function of these structures. The study was enriched by a deep analysis of maps of molecular electrostatic potential (MEP). The coordinated analysis of MEP, together with the NBO and AIM results, allowed us to rationalize novel distribution aspects of the potential created in the space around a molecule. © Springer-Verlag 2010.

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