Abstracts - CDT Nº 34

  Documents Science, Technology & Society  
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bullet Science, Technology and Social Policies
María Elina Estébanez*
Key Words : Science, technology and society - social policy - research utilization
This paper refers to a less explored aspect in science, technology and society relationships: the means of diffusion and use of scientific and technological knowledge in social policies. In order to detect types of interaction with the scientific and technological sector and stimulating or obstructing factors, a study of national social programmes was done. Those programmes become the field where available, ad hoc produced and adapted knowledge applications are exchanged and used.
*) Sociologist, researcher at the Centre for Studies on Science, Development and Upper Education, associated to the National Council for Research on Science and Technology (CONICET) and the Faculty of Social Sciences of the University of Buenos Aires, Argentina. E-mail: marilina@ricyt.edu.ar

  Humanities - Social Sciences  
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bullet Niklas Luhmann: The complex Uncertainty either a Secularized World*
Elvio A. Tell **
Key Words : late Modernity - systems - difference - contingency - uncertainty
Niklas Luhmann's work invites us to think over society in a new way, leaving behind old habits and traditional thoughts built by the Western intellectual heritage since the Illustration. Lukhmann's reluctance to sustain the basic postulates of the ancient European thought and his concern about proposing an illustration of the Illustration are no more that forewords to approaching the requirements of a new theory more suitable to modern times. Thus, it could be said that he requires to go beyond Modernity tempting to create new intellectual categories. As an example, his work implies a constant concern to conceive a new concept of subject independent from his/her context meant in terms of social systems, and while the analysis of social communication traditionally implies subjects, for the studied author that represents a chimera. Even when communication assumes the participation of either several or many people, that is the very reason why it cannot be attributed to any particular one.
*) This paper derives from the homonymous research project developed during 2001-2004 at the Faculty of Social Work, National University of Entre Ríos, afforded by the SICTFHR -UNER, Final Report approved by Resolution CS # 037/06; it was submitted in April 2006 and accepted in February 2007.
**) PhD., Regular Full Professor of Philosophy and Ethics, Faculty of Social Work, UNER. E-mail: filoso10@yahoo.com.ar

bullet Paulo Freire: A Pedagogy from Latin America*
Lidia M. Rodríguez**, Carlos Marín, Silvia M. Moreno, María del C. Rubano
Key Words : popular education - pedagogical alternatives - adults' education - Educational Philosophy - History of Education
In this paper a survey is made through the work of Paulo Freire, whose thought was a rich contribution to the field of Education during the Twentieth Century. Our effort to historicize it took us to go along the intellectual course of that Brazilian pedagogue from his first working experiences in Brazil, through the ones he held in Chile and some African countries undergoing decolonization processes, and back to his home country when the political conditions allowed it, where he was engaged with the proposals of the Party of the Workers (Partido de los Trabajadores -PT-). The research aimed to recover some of the richer aspects of Freire's contributions in order to connect them to specific educational problems of youngsters and adults and to theoretical developments related to communication and culture.
*) This paper presents results of the research project # 3089, Faculty of Educational Sciences, National University of Entre Rios - UNER-, 2002 to 2005, afforded by SICTFRH -UNER; research team: C. Marin, S. Moreno, M. Rubano, M. Manuale y A. Strada; it Final Report approved by Resolution #139/06; it was submitted in August 2006 and admitted in February 2007.
**) PHD at the University of Paris VIII, France; Assistant Professor of Education and Culture, Social Communication, Faculty of Educational Sciences, UNER. E-mail: lidiame@fibertel.com.ar

  Exact and Natural Sciences - Engineering and Technologies  
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bullet Physiological conclusions and fractal estimators*
María Eugenia Torres** ; Gastón Schlotthauer
Key words : Long range dependency - Self similarity - Hurst exponent - Physiology
In this paper we compare three different methods used to estimate Hurst exponent and we analyze their efficiency while they are applied in data series of different lengths. We analyze synthesized fBm time series, pure and with superimposed sinusoidal trends. We show that the three methods here discussed, DFA, wavelets based and discrete variations, no only are highly dependent on the signal length, but also on the order or number of moments (polynomic, wavelet regularity or discrete variations). For large enough data length (higher than 212), the methods based on wavelets and discrete variations have shown to be the less biased and the more stable ones for simulated fBm signals. We show that DFA method, the most widely used among the biomedical community, is the one that provides worst estimators, displaying ambiguous results while applied to real biological signals of different lengths and for different parameters in the estimator. More over, nor DFA neither the other two methods provide reliable estimators if physical or physiological conclusions are wanted. The obtained results indicate that more caution should have to be taken while trying to derive physiological conclusions from the Hurst exponent estimations obtained from real data.
*) This paper presents the results of the research projects PID-UNER 6060/2000-2005 and PICT-2002 11-12700, National Agency for the Promotion of Science and Technology, developed at the Faculty of Engineering, National University of Entre Rios -UNER- 200-2005, Final Report approved in 2006, submitted in August 2006 and accepted in Dicember 2006.
**) Maths Doctor, Regular Professor in Mathematics III, Faculty of Engineering, UNER, Director of the aboved mentioned research projects. E-mail: metorres@ceride.gov.ar

bullet Mathematical Correlation of Tomato Colour Indexes with Textural Parameters and Carotenoids Concentration
Luz Zapata, Liliana Gerard, Cristina Davies, Leticia Oliva, María Schvab
Key words: tomato - color indexes - texture - carotenoids
Tomato colour and texture attributes, concentration of colour responsible-carotenoids and colour indexes as indicators of maturity were studied. The a*/b*ratio (CIEL*a*b system) showed statistically significant differences among the different stages. As a result, this relation could be taken as a colour index reference in tomatoes. With regard to texture parameters, the puncture force decreased along the stages studied and this fact could be due to changes in the chemical composition. Since the a*/b* ratio showed a high correlation with concentrations of lycopene and b-carotene and with texture parameters, the proposed mathematical models could be valid for analyzing and predicting changes in the fruit carotenoids concentration and texture. This can determine the consumer´s acceptability from the organoleptical and nutritional point of view.
*) This paper derives from the research project "Evaluation of the tomato (Lycopersicon Solanaceae) antioxidative activity during its growing, storage, maturity and commercialization", lead during 2005-2006 at the Faculty of Food Sciences, National University of Entre Ríos, funded by UNER; it was submitted in August 2006 and accepted in April 2007.
**) Food Engineer, head of the research team, Regular Professor of Organic Chemistry I, Faculty of Food Sciences, UNER. E-mail: zapatam@fcal.uner.edu.ar

  Agricultural Sciences - Medical Sciences  
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bullet Native Microorganism Bioactivity in Oranges Infected by Penicillium digitatum Resistant and Sensitive to Fungicide *
Visintin, G**.; Gieco, I.; García, B. y Fálico, L.
Key words: Biocontrol - Postharvest rots - Penicillium digitatum - Citrus sinensis.
The objective of this work was to evaluate the effect of local microorganisms on suppressing rots caused by Penicillium digitatum in Valencia Late oranges. Oranges at commercial maturity were inoculated with 40 ml of microbial suspension (107-108 ufc/ml) to each wound. After two hours, 20 ml of a suspension (3,8 x 106 con/ml) of fungicide sensitive or resistant Penicillium were applied. The oranges were incubated for eight days under laboratory conditions, using CAD of five treatments with 25 fruits and four repetitions. The accumulated incidence of rotten fruits was registered; the infection rates, adjusting the disease progress curves to mathematical models, and the efficacy rates for each treatment were obtained. The bioactive capacity of evaluated microorganisms was higher in the sensitive to fungicide Penicillium strain. Within native micoorganisms, CNOV1 a bacterium isolated from orange phyllosphere was the most effective showing the lowest incidence of symptomatic fruits as well as the lowest infection rates in Valencia Late oranges.
* Article derived from the research project "Postharvest biocontrol of green and blue mold of citrus fruit", developed at the Faculty of Agricultural Sciences, UNER, supported by the SCITFRH, UNER; Research team director: Prof. Ladys Fálico. It was submitted in April 2006 and accepted in March 2007.
** Research project co-director, Assistant Profesor in Phytopathology, Faculty of Agricultural Sciences, UNER. Email: gvisintin@fca.uner.edu.ar