Structure of the phytoplanktonic community in a neotropical Dam with environmental tension

Silva, Paula Martinez; Yustres, Jorge Leonardo Munoz; Pinilla, Luis Alexander Carvajal; Serrezuela, Ruthber Rodríguez

doi:10.12988/ces.2018.8233

Cited by 3 publications

(1 citation statement)

References 11 publications

(15 reference statements)

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“…X 1 , X 2 and X 3 represent factors corresponding to SA (0.5 to 1.0), LAG (0.5 to 1.0) and GLY (8 to 15), respectively. Only those statistically significant coefficients (P ≤ 0.05) were considered in the model; and the remaining coefficients, if considered, yielded much lower R-values, thus, less predictability [21] [22].…”

Section: Response Surface Methodology and Optimizationmentioning

confidence: 99%

Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

González-Cuello¹,

Mogollon²,

Berrio-Guzman³

et al. 2018

ces

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Objective: In this study, a Box-Behnken design was employed in order to optimize the concentration of sodium alginate (SA), low acyl gellan (LAG) and glycerol (GLY) as a function of tensile strength (TS) and elongation at break (EB) of the biofilms. Methods: A texturometer Shimadzu model EZ-Test EZ-S was employed to evaluate TS and EB by using constant displacement control with a crosshead speed of 30 mm/min. Rafael E. González-Cuello et al. Results: The regression model developed herein indicates that the selected variables were statistically determinants (p < 0.05) for the studied mechanical properties. The optimal concentration to obtain high TS values (134.38 MPa) were 1.00% (w/v) of SA, 1.00% (w/v) of LAG and 8.00% (v/v) of GLY. However, low values of EB (15.95%) were also obtained using the same concentrations of AS, GBA and GLY. Conclusions: By increasing the concentration of SA and LAG result in highly resistant biofilms with low flexibility while increasing the glycerol concentration and reducing the concentration of biopolymers yielded the opposite effect. The Box-Behnken design is a useful statistical method for improving the mechanical properties studied depending on the final application of the biofilms.

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Section: Response Surface Methodology and Optimizationmentioning

confidence: 99%

Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

González-Cuello¹,

Mogollon²,

Berrio-Guzman³

et al. 2018

ces

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Composition of the phytoplankton community in the first stages of the Quimbo dam life cycle in Huila - Colombia

Silva¹,

Yustres²,

Benavides³

et al. 2018

ces

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The Quimbo Dam was built over the Magdalena River in 2011 and started functioning in November 2015. In this research the composition of phytoplankton during its first stages of functioning was studied through qualitative-quantitative analysis as well as the relation among the most abundant species and the physicochemical parameters of pH, DO, water Temperature, and conductivity though correlation analysis. Quantitative results of microalgae were analyzed with diversity indexes of Shannon, Margalef, Simpson and, Dominance. A total of 12 Classes, 58 genders, and 84 species, including 8 new registers for Colombia were found. The classes BACILLAROPHYCEAE, CHOLORPHYCEAE and CYANOPHICEAE were the most abundant in species and cells/ml. Eight species represented more than 10% of the total cells/ml in every sample and they are all related with eutrophic conditions. Dissolved oxygen and pH were measured at three different depths in four stations showing a clear tendency to hypoxia. Further studies are needed as well as sustainable strategies of management and monitoring for the dam, to prevent it from reaching a deadline sooner than needed and affecting even more the Magdalena river basin.

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The interaction man-computer and its involvement in the change of paradigms of education

Cardozo¹,

Pedraza²,

Salazar³

et al. 2018

ces

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The present article of reflection seeks to show how technology, especially the applications achieved through the HCI: Human Computer Interaction contributes to the strengthening of the teaching-learning process, to such an extent that some scholars even consider it as the emergence of a new pedagogy. Researchers in the field of HCI both observe the ways in which humans interact with computers and design technologies that let humans interact with computers in novel ways. As a field of research, human-computer interaction is situated at the intersection of computer science, behavioral sciences, design, media studies, and several other fields of study.With this purpose, some of the technological advances that we find today are portrayed at the expense of education and the way in which a technological era arises in the education of our country.

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Structure of the phytoplanktonic community in a neotropical Dam with environmental tension

Cited by 3 publications

References 11 publications

Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

Optimization of the mechanical properties of biofilm based on alginate - gellan plasticized with glycerol

Composition of the phytoplankton community in the first stages of the Quimbo dam life cycle in Huila - Colombia

The interaction man-computer and its involvement in the change of paradigms of education

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