http://hdl.handle.net/11336/90076 Capítulos de libros de CTRO.CIENTIFICO TECNOL.CONICET - NORDESTE 2024-04-08T21:13:47Z http://hdl.handle.net/11336/226909 Products from the delignification of sugarcane bagasse Area, Maria Cristina; Felissia, Fernando Esteban; Vallejos, María Evangelina The main drawbacks of most of the sugar mills can be summarized in the generation of a low added value product, with a peak of activity in the period of harvesting. The lignocellulosic residue of the sugar extraction is usually burned as fuel. However, sugarcane can be a source of multiple products. The overall goal of this project was to study the technical and economic feasibility of the production of unconventional derivatives of sugarcane bagasse, using environmentally friendly and economically competitive technologies. From a point of view of the integrated utilization of sugarcane, we have worked with a strategy that aims to study the use of biomass for chemicals and energy, through an appropriate combination of process engineering and product engineering. We studied different processes, including technologies that employ mostly ethanol, generated by the same industry and proposing alternative uses of the sugarcane bagasse. The approach is applicable to industries in the Latin American region. This chapter presents the main results obtained throughout the project. 2012-01-01T00:00:00Z http://hdl.handle.net/11336/221202 Isolation and selection of tolerant fungal strains from soil polluted with heavy metals Tatarin, Ana Silvia; Sadañoski, Marcela Alejandra; Polti, Marta Alejandra; Burgos Fonseca, María Isabel Polluted soil is a reservoir of tolerant fungi. Isolation of fungal strains from polluted soil is an interesting strategy to employ them for mycoremediation. Spread plate is an interesting technique to isolate tolerant fungal strains. Tolerance is an important characteristic to select fungal strains capable of growth in presence of heavy metals. Tolerance can be measured by plate screening technique and fungal development can be understood by predictive micology. Therefore, tolerant isolates have a promising capacity to be applied in heavy metals bioremediation. 2022-01-01T00:00:00Z http://hdl.handle.net/11336/210278 Somatic Embryogenesis and Plant Regeneration in Paradise Tree (Melia azedarach L.) Mroginski, Luis Amado; Vila, Silvia Karina; Rey de Badaró, Hebe Yolanda Several factors affecting somatic embryogenesis induction and conversion in paradise tree (Melia azedarach) were evaluated. Somatic embryogenesis was influenced by plant growth regulators, stage of development of the explant, carbohydrate source, gelling agents, light intensity and induction time. MS medium with 1 mg/l TDZ (thidiazuron) proved to be the best for the induction of embryogenic tissue. Zygotic embryos, 1-1.5 mm long (torpedo and early cotyledonar stage), had a greater embryogenic response than smaller or larger embryos, and resulted in a better conversion of somatic embryos into plants. Embryos formed in media containing 3% sucrose or raffinose had better morphology. Induction and conversion of somatic embryos was superior on medium solidified with agar. The explants maintained under 160 µmol m-2 s-1 or 1 week in darkness and later under 160 µmol m-2 s-1 produced a significantly higher embryogenic index. Only 4 days of treatment on induction medium, with either raffinose or sucrose at 3% as carbohydrate source, were required to induce somatic embryogenesis. However, a longer exposure, up to 18 days, increased the yield and improved the morphology of somatic embryos. After 6 weeks of culture on induction medium, somatic embryos were categorized in four morphological classes based on presence of single or fused embryos and considering if they remained attached or not to the original explant. Somatic embryos of each category were transferred on 1/4 MS medium. Bipolar, more typically normal embryos, had well defined shoot and root apical meristems and produced single plants; when these embryos were subcultured individually, conversion reached 28%. If fused embryos were cultured, only 2.1% conversion was observed and regenerated plants presented fused stems. The lack of conversion of other embryo classes was associated with poorly developed shoot and root meristematic areas or with their complete absence. The converted plants acclimatized and transferred, in a mist, to soil with a 95% survival rate. 2012-01-01T00:00:00Z http://hdl.handle.net/11336/201081 L'abolition des Villages d'Indiens au Paraguay (1848): Assimilation ou négociation? Telesca, Ignacio El trabajo analiza la supresión de los Pueblos de Indios en Paraguay por Carlos Antonio López en 1848. Intenta descifrar las razones por detrás de los dichos y se centra fundamentalmente en la reacción de los mismos indígenas y en su comprensión. 2021-01-01T00:00:00Z