Escuela Superior Politecnica Agropecuaria de Manabi

www.espam.edu.ec
Manta, Ecuador
SEARCH FILTERS
Time filter
Source Type

Giordano E.,Escuela Superior Politecnica Agropecuaria de Manabi
Rivista Geografica Italiana | Year: 2016

The development of peri-urbanization in Galápagos: the case of Santa Cruz island. - Historically the Galápagos archipelago has been identified as an exemplary case of a tourism development able to preserve the environmental heritage and as an example of an eco-tourism system of excellence. However, over the last decade, population growth and the motorization of the insular mobility have fundamentally changed the traditional process of settlement of the population and therefore the internal equilibrium of the system. Through the study of the main island of the archipelago, Santa Cruz, in the article we discuss the reasons beyond this change, noting how for the first time in his history the island is undergoing a rapid process of peri-urbanisation that puts at risk the tangible and intangible heritage of the island.


Camejo D.,CSIC - Center of Edafology and Applied Biology of the Segura | Camejo D.,Escuela Superior Politecnica Agropecuaria de Manabi | Guzman-Cedeno A.,Escuela Superior Politecnica Agropecuaria de Manabi | Guzman-Cedeno A.,Civil University Eloy Alfaro of Manabí | Moreno A.,Technical University of Machala
Plant Physiology and Biochemistry | Year: 2016

Reactive oxygen species (ROS) are continually generated as a consequence of the normal metabolism in aerobic organisms. Accumulation and release of ROS into cell take place in response to a wide variety of adverse environmental conditions including salt, temperature, cold stresses and pathogen attack, among others. In plants, peroxidases class III, NADPH oxidase (NOX) locates in cell wall and plasma membrane, respectively, may be mainly enzymatic systems involving ROS generation. It is well documented that ROS play a dual role into cells, acting as important signal transduction molecules and as toxic molecules with strong oxidant power, however some aspects related to its function during plant-pathogen interactions remain unclear. This review focuses on the principal enzymatic systems involving ROS generation addressing the role of ROS as signal molecules during plant-pathogen interactions. We described how the chloroplasts, mitochondria and peroxisomes perceive the external stimuli as pathogen invasion, and trigger resistance response using ROS as signal molecule. © 2016 Elsevier Masson SAS.


Zevallos B.,Escuela Superior Politecnica Agropecuaria de Manabi | Cejas I.,Avila University | Valle B.,Avila University | Yabor L.,Avila University | And 4 more authors.
Scientia Horticulturae | Year: 2013

In this work, we studied the effect of short-term liquid nitrogen storage on the germination and phenolics contents of wild tomato (Solanum lycopersicum Mill.) seeds. After storage in liquid nitrogen for different time periods (0, 7, 14, 21 and 28 days), seeds were retrieved from liquid nitrogen and set to germinate. Both control and cryopreserved seeds displayed about 60% germination without statistically significant differences. No phenotypic changes were observed visually in seedlings recovered from different treatments 7 days after onset of germination. After 7 days, levels of phenolics (free, cell-wall linked and total) were recorded in roots, stems and leaves of seedlings. When seeds were immersed in liquid nitrogen for 7, 14 and 21 days, the levels of cell wall-linked, free and total phenolics decreased significantly in roots and stems, compared to non-cryopreserved controls. However, their concentration generally increased when seeds were immersed in liquid nitrogen for 28 days. In leaves, a similar pattern to that observed in roots and stems was noted with the free phenolics content but cell wall-linked phenolics increased in leaves of seedlings derived from seeds immersed in liquid for 7 or 14 days. Further studies are required to clarify the mechanisms underlying the changes recorded here. © 2013 Elsevier B.V.


PubMed | University of Naples Federico II, Escuela Superior Politecnica Agropecuaria de Manabi, National Research Council Italy, Avila University and IRD Montpellier
Type: Journal Article | Journal: Cryo letters | Year: 2014

Before cryopreservation is routinely used, its effect on the trueness-to-type of the regenerated plant material needs to be evaluated.In this work, we studied the effect of seed cryopreservation on the phenotypic and molecular characteristics of wild Solanum lycopersicum Mill. plants.Thirty-five morphological traits of plants regenerated from cryopreserved seeds were compared to those measured on plants regenerated from non-cryopreserved seeds.No statistically significant differences were observed between cryopreserved and non-cryopreserved samples, either in the first or in the second generation post-liquid nitrogen exposure. However, at the molecular level, the genetic analyses performed on the second generation plants germinated from control and cryopreserved seeds using 14 nuclear Simple Sequences Repeats (SSR) markers uncovered some changes in microsatellite length between control and cryopreserved samples. These results confirm at the botanical phenotype level the effectiveness of seed cryostorage for conservation and regeneration of true-to-type S. lycopersicum plants.Further experiments are required to clarify potential phenotypic effects of the changes observed in the DNA.


Djerdali S.,Ferhat Abbas University Setif | Guerrero-Casado J.,University of Cordoba, Spain | Tortosa F.S.,University of Cordoba, Spain | Tortosa F.S.,Escuela Superior Politecnica Agropecuaria de Manabi
Bird Study | Year: 2016

Capsule Accessing extra food from waste dumps increases egg volume and hatching mass in White Storks. Aim To test how White Storks vary their investment in egg size, especially in last laid eggs, in relation to food availability, and to improve our understanding of the importance of extra feeding on intra-clutch variation. Methods The study was carried out in three White Stork breeding colonies in northern Algeria. Breeding performance was recorded in 70 nests over three years. White Stork colonies situated close to chicken farms were considered to be part of a ‘pseudo experiment’ where parents had access to extra food. Egg volume, laying order, hatching order and hatching weight were recorded. Results Egg volume and hatching mass in White Storks was significantly greater when they had access to extra food. The reproductive value of last laid eggs (fourth and fifth) doubled when females had access to extra food. Conclusion Laying smaller last eggs within a clutch provides a mechanism to facilitate early brood reduction in the White Stork, and so should be advantageous when food is scarce. On the contrary, when females had access to extra food, last laid eggs were as big as first eggs which suggests egg size variation is adaptable to local conditions. © 2016 British Trust for Ornithology


Alvaro Canadas L.,Instituto Nacional Of Investigaciones Nacionales | Carlos Molina H.,Instituto Nacional Of Investigaciones Nacionales | Diana Rade L.,Escuela Superior Politecnica Agropecuaria de Manabi | Francisco Fernandez M.,Campus Polytechnic Calceta
Revista MVZ Cordoba | Year: 2016

Objective. To assess the interaction effect of the season and planting densities on the production of eight INIAP corn hybrids. Materials and methods. A research process was conducted in 2013. It was applied a split - split plot design with three replication and Tukey test was used. It was evaluated two planting seasons (28 January and 8 April), they were placed in large plots. Two planting densities (65,500 y 125,000 plants/ha), that were located in the subplots and eight INIAP corn hybrids arranged in the sub- subplots. The evaluated variables were Fresh Matter, Dry Matter, Plant Height and Crude Protein Results. Fresh Matter and Crude Protein productions were influenced by planting seasons. Plant densities affected the production of Fresh Matter, Dry Matter and Plant Height, as well as the interaction season by corn INIAP hybrids. While INIAP corn hybrids showed statistical differences in the production of Fresh, Dry Matter, Plant Height and Crude Protein. The eight INIAP hybrids productions were: Fresh Matter (58.86 ton/ha ±5.19); Dry Matter (21.45 ton/ha ±4.71); Plant Height (2.46 m ±0.16) and Crude Protein (10.6±1.12). Conclusions. The performance showed by hybrids INIAP CML-172, INIAP 6021 and INIAP 551 were very acceptable forage material and could be used for silage purposes.


PubMed | Technical University of Machala and Escuela Superior Politecnica Agropecuaria de Manabi
Type: | Journal: Plant physiology and biochemistry : PPB | Year: 2016

Reactive oxygen species (ROS) are continually generated as a consequence of the normal metabolism in aerobic organisms. Accumulation and release of ROS into cell take place in response to a wide variety of adverse environmental conditions including salt, temperature, cold stresses and pathogen attack, among others. In plants, peroxidases class III, NADPH oxidase (NOX) locates in cell wall and plasma membrane, respectively, may be mainly enzymatic systems involving ROS generation. It is well documented that ROS play a dual role into cells, acting as important signal transduction molecules and as toxic molecules with strong oxidant power, however some aspects related to its function during plant-pathogen interactions remain unclear. This review focuses on the principal enzymatic systems involving ROS generation addressing the role of ROS as signal molecules during plant-pathogen interactions. We described how the chloroplasts, mitochondria and peroxisomes perceive the external stimuli as pathogen invasion, and trigger resistance response using ROS as signal molecule.


Vera-Montenegro L.,Escuela Superior Politecnica Agropecuaria de Manabi | Baviera-Puig A.,Polytechnic University of Valencia | Garcia-Alvarez-Coque J.-M.,Polytechnic University of Valencia
International Food and Agribusiness Management Review | Year: 2014

Ecuador supplies 70% of the world's fine aroma cocoa (Theobroma cacao). This paper defines a model of post-harvest technology selection, adapted to small producers, using two multi-criteria models that evaluate the quality, processing cost, and technology adoption capability of each technology. To achieve this result, a preliminary assessment of nine post-harvest technologies is performed, considering only the quality criteria. We then apply the analytical hierarchy process and fuzzy logic methodologies considering the other criteria (processing cost and technology adoption capability). The models provide alternative methods to achieve solutions that reflect the reality of small cocoa producers' decision-making processes. © 2014 International Food and Agribusiness Management Association (IFAMA).


Vera-Montenegro L.,Escuela Superior Politecnica Agropecuaria de Manabi | Baviera-Puig A.,Polytechnic University of Valencia | Garcia-Alvarez-Coque J.-M.,Polytechnic University of Valencia
Spanish Journal of Agricultural Research | Year: 2014

Ensuring that the post-harvest process yields good quality cocoa is a relevant research question. However, the literature currently lacks detailed studies of producers' criteria for post-harvest technology selection. There is therefore a need for research that examines technology choice based on several criteria. This is the aim of our paper. We defined a cocoa post-harvest technology selection model to assist small producers in Ecuador. To do so, we employed the Analytical Hierarchy Process (AHP) to assess the following criteria: quality, processing cost and technology adoption capability. By considering only quality, we first performed a preliminary assessment of nine post-harvest technologies yielded by all possible combinations of fermentation and drying methods. Under the criterion "quality", results show that no post-harvest technology is preferable to another. This implies that quality differences between producers do not derive from technology choice but rather from the rigour with which producers perform fermentation and drying processes. After adding the criteria "processing cost" and "technology adoption capability", we performed the analysis again. This multi-criteria approach offered a better way to approximate small farmers' real needs when selecting technology for cocoa post-harvest. Although quality was the highest-valued criterion, high scores attributed to some technologies in the other two criteria offset scores for quality. Thus, processing cost and technology adoption also emerged as relevant factors for small holders.


PubMed | Escuela Superior Politecnica Agropecuaria de Manabi and Polytechnic University of Valencia
Type: Journal Article | Journal: Sensors (Basel, Switzerland) | Year: 2015

Several systems have been proposed to monitor wireless sensor networks (WSN). These systems may be active (causing a high degree of intrusion) or passive (low observability inside the nodes). This paper presents the implementation of an active hybrid (hardware and software) monitor with low intrusion. It is based on the addition to the sensor node of a monitor node (hardware part) which, through a standard interface, is able to receive the monitoring information sent by a piece of software executed in the sensor node. The intrusion on time, code, and energy caused in the sensor nodes by the monitor is evaluated as a function of data size and the interface used. Then different interfaces, commonly available in sensor nodes, are evaluated: serial transmission (USART), serial peripheral interface (SPI), and parallel. The proposed hybrid monitor provides highly detailed information, barely disturbed by the measurement tool (interference), about the behavior of the WSN that may be used to evaluate many properties such as performance, dependability, security, etc. Monitor nodes are self-powered and may be removed after the monitoring campaign to be reused in other campaigns and/or WSNs. No other hardware-independent monitoring platforms with such low interference have been found in the literature.

Loading Escuela Superior Politecnica Agropecuaria de Manabi collaborators
Loading Escuela Superior Politecnica Agropecuaria de Manabi collaborators