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Among the most widely used metallic nanoparticles are those synthesized from silver ions, that's why the study of their synthesis methods is essential in the development of nanotechnology. The biogenic synthesis of nanoparticles with metabolites from extracts of plants, fungi and bacteria are considered a sustainable and environmental-friendly method. In this work a study of the state of the art is carried out on the biological synthesis of silver nanoparticles using bacteria, plants and fungi, and in particular on Trichoderma species. The results obtained from the conducted review show that the nanoparticles produced with Trichoderma have spherical morphology, great uniformity, a size distribution between 6-60 nm and stability. A methodology is needed that allows to define the optimal parameters for obtaining these nanoparticles on a larger scale. [ABSTRACT FROM AUTHOR]

In this work, a kinetic study of the extraction of phenolic compounds from the micelial biomass of Pleurotus ostreatus obtained by submerged fermentation of was carried out. The conversion factors from substrate to biomass (Yx/s), substrate to product (Yp/s) and biomass productivity (Px, and Pp) were calculated, with values of 0,39 g of biomass·g of glucose-1, 0,1 g of total phenols·g of glucose-1, 0,047 g of biomass·L-1 h-1 and 0,0006 g of phenols L-1 h-1, respectively. The growth data were adjusted to the Gompertz model with a coefficient of determination (R2) of 0,88, while the glucose consumption data adjusted better to a Logistic model with an R2of 0,95(p < 0,05). The kinetic parameters of the process were obtained, such as the specific growth rate (µ, 0.031 h-1) and the specific speed of glucose consumption (µg, 0,011 h-1). [ABSTRACT FROM AUTHOR]

The work was carried out in the Laboratory of Antibodies and Experimental Biomodels (LABEX) with the objective of evaluating the cultivation system of the microalgae Porphyridium cruentum. Bubble column photobioreactor was used in the experiments to obtain biomass. This allows introducing a new product to the market with a positive impact on the National Health System. Kinetic parameters of 0,29 d-1 and 2,37 d, were reached for the specific maximum growth rate and the doubling time respectively. The system is characterized as a low volumetric productivity with 0,09 g·L-1·d-1 and cellular density of 5,2 g·L-1 of wet biomass. Gompertz and Logistic models were evaluated for biomass description. Residual Sum of Squares (RSS), Akaike's Information Criterion Test (AIC) and coefficient RSquare were used as selection criteria. Logistic model described microalgal growth under the conditions used in this research with 0,9836 R² coefficient. [ABSTRACT FROM AUTHOR]