Programa de Genética General : Plan 406/08

Programa del curso obligatorio de Genética General, correspondiente al primer semestre del Seguno Año del Plan 406/08 de la Carrera de Medicina Veterinaria de la Facultad de Ciencias Veterinarias de la UNLP. El curso de Genética General se concibe como la introducción y el fundamento para acceder a los contenidos de genética cuantitativa y de genética de poblaciones con el propósito de que el alumno maneje los métodos para realizar mejoramiento animal.Dado que no se cuenta con la fecha de aprobación y publicación por el Honorable Consejo Directivo, se asigna la fecha de su primer ciclo lectivo: 1° de marzo de 2008.Facultad de Ciencias Veterinaria

Programa de Genética y Biometría : Plan 206/82

Programa Analítico del curso de Genética y Biometría, correspondiente al Segundo Año de la Carrera de Medicina Veterinaria del Plan de Estudios 206/82. El curso de Genética y Biometría se concibe como la introducción y el fundamento para los contenidos de genética cuantitativa y de genética de poblaciones con el propósito de que el alumno maneje los métodos para realizar mejoramiento animal.Facultad de Ciencias Veterinaria

Epistemological Debate Underlying Computer Simulations Used in Science Teaching: The Designers’ Perspective

Computer simulations are widely used in many research areas and their role in the production of scientific knowledge is nowadays the subject of debate in philosophy of science. However, there hasn´t been such debate regarding their use in science teaching. This work presents the results of a phenomenographic case study involving three researchers that design and use computer simulations in physics. The study analyzes these designers view on simulations and on the role of simulations in physics teaching. The results show that they agree on the fact that computer simulations have changed the way we do science and that they share many characteristics with the classical models: they derive from theories, they help to predict and explain phenomena, and their results need to be empirically validated. They consider simulations used in science teaching ?that differ from those used in research in their objectives as well as their design? to be useful as they allow students to visualize and/or work on a phenomenon from the viewpoint of the mathematical model, the physical, and the virtual one in an interrelated way. In general, the designers views on simulations and their use in science and education were more complex and meaningful than those conveyed by novel researchers in science teaching or found in research articles on secondary education that look at this subject.Fil: Seoane, María Eugenia. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas; ArgentinaFil: Arriassecq, Irene. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaFil: Greca, Ileana. Universidad de Burgos; Españ

Biocomposites from polyhydroxybutyrate and bio-fillers by solvent casting method

Biocomposites from polyhydroxybutyrate (PHB) and some bio-fillers such as lignin (L), alpha cellulose (AC) and cellulose nanofibrils (CNFs) were prepared to investigate the effect of the bio-fillers on the properties of PHB by a solvent casting method. The thermal properties by thermogravimetry analysis (TGA-DTG and DTA) and differential scanning calorimetry (DSC) were determined; morphological characterization by scanning electron microscopy (SEM) and structural analysis by X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) of the biocomposites were performed. TGA curves showed that the highest values for T-10\%, T-50\% of the biocomposites were 278.2(degrees)C for PHB+2\%AC and 291.7(degrees)C for PHB+2\%CNFs; however, the best value for T-75\% was obtained as 381.5(degrees)C for PHB+2\%L. According to DTG curves, the best results were found for PHB+0.5\%L and PHB+0.5\%CNFs. DTA showed an increase in temperature of maximum degradation with loading of lignin and CNFs. The addition of bio-fillers increases T-c and T-m for both first cooling/heating and second cooling/heating. T-c and T-m values for first cooling/healing were found to be lower as compared with second cooling/healing. Furthermore, the addition of bio-fillers acts as a nucleating agent in PHB and SEM pictures showed the porous structure in all biocomposites. SEM images revealed uniform distribution of the reinforcing particles in the polymer at low loadings (0.5 wt\%), while higher loadings (2 wt\%) of L and CNFs contributed to easy aggregation within the PHB matrix. In XRD studies, PHB in the range 5-55 degrees shows 6 main peaks. XRD patterns of the PHB biocomposites revealed 3 main peaks at 13.57(degrees), 16.87(degrees) and 22.1 degrees, and the other peaks disappeared in the patterns. The largest and lowest values of X-c were found for PHB+2\%AC and PHB+2\%CNFs, respectively

Polyhydroxyalkanoates (PHAs) for the Fabrication of Filtration Membranes

International audienceUndoubtedly, in our current society, the development of more sustainable materials has to be considered in many applications. In this chapter, the interest of new potential biomaterials intended for the fabrication of filtration membranes is discussed. A focus is made on the polyhydroxyalkanoates (PHAs) polymers family. These biobased and biodegradable polyesters have gained attention in the past few years thanks to their versatile properties. Up to date, they have shown promising results for the fabrication of pervaporation and liquid filtration membranes. The membrane performances could be tuned by the use of PHAs having different comonomer contents and by the addition of proper additives. By discussing what has been developed in other application areas, such as biomedical and packaging, some insights are suggested in order to improve the overall PHAs-based membranes properties. Hence, the first part will deal with the membrane technologies and the current polymeric materials used. A second part will highlight the interest of biopolymers. Then, the properties and potential applications of PHAs in the membrane manufacture will be discussed. © 2021, Springer Nature Switzerland AG

Haptophyta

Haptophyta are predominantly planktonic and phototrophic organisms that have their main distribution in marine environments worldwide. They are a major component of the microbial ecosystem, some form massive blooms and some are toxic. Haptophytes are significant players in the global carbonate cycle through photosynthesis and calcification. They are characterized by the haptonema, a third appendage used for attachment and food handling, two similar flagella, two golden-brown chloroplasts, and organic body scales that serve in species identification. Coccolithophores have calcified scales termed coccoliths. Phylogenetically Haptophyta form a well-defined group and are divided into two classes Pavlovophyceae and Coccolithophyceae (Prymnesiophyceae). Currently, about 330 species are described. Environmental DNA sequencing shows high haptophyte diversity in the marine pico- and nanoplankton, of which many likely represent novel species and lineages. Haptophyte diversity is believed to have peaked in the past and their presence is documented in the fossil record back to the Triassic, approximately 225 million years ago. Some biomolecules of haptophyte origin are extraordinarily resistant to decay and are thus used by geologists as sedimentary proxies of past climatic conditions