Mapping Genetic Diversity of Cherimoya (Annona cherimola Mill.): Application of Spatial Analysis for Conservation and Use of Plant Genetic Resources

There is a growing call for inventories that evaluate geographic patterns in diversity of plant genetic resources maintained on farm and in species' natural populations in order to enhance their use and conservation. Such evaluations are relevant for useful tropical and subtropical tree species, as many of these species are still undomesticated, or in incipient stages of domestication and local populations can offer yet-unknown traits of high value to further domestication. For many outcrossing species, such as most trees, inbreeding depression can be an issue, and genetic diversity is important to sustain local production. Diversity is also crucial for species to adapt to environmental changes. This paper explores the possibilities of incorporating molecular marker data into Geographic Information Systems (GIS) to allow visualization and better understanding of spatial patterns of genetic diversity as a key input to optimize conservation and use of plant genetic resources, based on a case study of cherimoya (Annona cherimola Mill.), a Neotropical fruit tree species. We present spatial analyses to (1) improve the understanding of spatial distribution of genetic diversity of cherimoya natural stands and cultivated trees in Ecuador, Bolivia and Peru based on microsatellite molecular markers (SSRs); and (2) formulate optimal conservation strategies by revealing priority areas for in situ conservation, and identifying existing diversity gaps in ex situ collections. We found high levels of allelic richness, locally common alleles and expected heterozygosity in cherimoya's putative centre of origin, southern Ecuador and northern Peru, whereas levels of diversity in southern Peru and especially in Bolivia were significantly lower. The application of GIS on a large microsatellite dataset allows a more detailed prioritization of areas for in situ conservation and targeted collection across the Andean distribution range of cherimoya than previous studies could do, i.e. at province and department level in Ecuador and Peru, respectively

Adsorbent materials obtained from palm waste and its potential use for contaminants removal from aqueous solutions

This work reports the production of an adsorbent material obtained by H3PO4 chemical activation of oil palm waste (fiber). The experiments were carried out to explore methylene blue uptake by this adsorbent. The influence of initial dye concentration and adsorbent dosage was investigated. The adsorption equilibrium data of methylene blue onto the adsorbent material were best fitted to the Langmuir model. The maximum adsorption capacity monolayer was of 20.85 mg g-1, which showed to be high compared to other adsorbent materials reported in the literature. Adsorption of methylene blue onto adsorbent material followed pseudo-second order model. The structural and chemical characterization of the adsorbent material was carried out by using various analytical techniques. FTIR showed the formation of oxygenated functional groups on the surface, which are very important for adsorption applications because they act as active sites capable of interacting with dye molecules. © 2019 Published under licence by IOP Publishing Ltd

Removal of dyes from aqueous solutions by adsorbent prepared from coffee residues

This study reports the production of an adsorbent material derived from extracted coffee residues using phosphoric acid and zinc chloride as activating agents. The structural features of the materials were characterized using different analytical techniques. The BET surface areas were found between 3.81 m2.g-1 y 176.27 m2.g-1, while the FTIR analysis showed the formation of oxygenated functional groups, which are active in the adsorption process. These materials were evaluated as adsorbents for the removal of methylene blue from aqueous solution. Batch adsorption tests were performed at room temperature and the effects of contact time and, initial dye concentration was investigated. The equilibrium adsorption results were complied with Langmuir isotherm model and its maximum monolayer adsorption capacity was 15.92 mg.g-1. Adsorption kinetics studies indicated that the pseudo second order model yielded the best fit for the kinetic data. This typical dependence of methylene blue uptake on kinetic studies indicated the adsorption process to be both chemisorption and diffusion controlled. The experimental data obtained in the present study indicate that coffee residues are suitable candidates for use as adsorbents in the removal of cationic dyes. © 2019 Published under licence by IOP Publishing Ltd

Caracterización de los pacientes con hemorragia de vías digestivas altas no varicosa en un hospital de tercer nivel de Cundinamarca, Colombia

Upper gastrointestinal tract bleeding is a common emergency whose most common etiology is a peptic ulcer. Restoration of intravascular volume and blood pressure management are priorities before identifying the cause of bleeding. After initial resuscitation and after hemodynamic stabilization has been achieved, an esophagogastroduodenoscopy (EGD) should be performed to identify the cause of bleeding and determine the treatment needed. This is a study performed at a third level referral hospital in Cundinamarca, Colombia. Materials and Methods: This is a retrospective study of data from electronic medical records of adult patients admitted to the emergency room of the Hospital Universitario de la Samaritana (HUS) because of upper gastrointestinal tract bleeding which ahd been diagnosed because of hematemesis, melena, rectal bleeding and/or anemia. Patients all underwent EGD between April 2010 and April 2011. Results: 385 patients with upper gastrointestinal tract bleeding were seen during the study period, but 100 were excluded because of bleeding secondary esophageal varices, incomplete clinical histories and lower gastrointestinal bleeding. A total of 285 patients were included. 69.1 % were older than 60 years, 73.3 % had hypertension, 55.1 % reported use of inflammatory drugs (NSAIDs) and aspirin (ASA), 19.6 % reported previous bleeding episodes, and 17.9 % had hemodynamic instability. 63 patients (22.1 %) required endoscopic hemostasis, and 32 (11.2 %) experienced rebleeding. Overall mortality reported was 13.1 % of which 55.3 % were men. Mortality attributable to gastrointestinal bleeding was 3.1 %. Conclusions: The majority of patients served by the HUS with upper GI bleeding are adults over 60 years. Peptic ulcers remain the most common diagnosis associated with the use of NSAIDs and ASA. The mortality rate is comparable to international standards. © 2013 Asociaciones Colombianas de Gastroenterología

Caracterización de los pacientes con hemorragia de vías digestivas altas no varicosa en un hospital de tercer nivel de Cundinamarca, Colombia

Upper gastrointestinal tract bleeding is a common emergency whose most common etiology is a peptic ulcer. Restoration of intravascular volume and blood pressure management are priorities before identifying the cause of bleeding. After initial resuscitation and after hemodynamic stabilization has been achieved, an esophagogastroduodenoscopy (EGD) should be performed to identify the cause of bleeding and determine the treatment needed. This is a study performed at a third level referral hospital in Cundinamarca, Colombia. Materials and Methods: This is a retrospective study of data from electronic medical records of adult patients admitted to the emergency room of the Hospital Universitario de la Samaritana (HUS) because of upper gastrointestinal tract bleeding which ahd been diagnosed because of hematemesis, melena, rectal bleeding and/or anemia. Patients all underwent EGD between April 2010 and April 2011. Results: 385 patients with upper gastrointestinal tract bleeding were seen during the study period, but 100 were excluded because of bleeding secondary esophageal varices, incomplete clinical histories and lower gastrointestinal bleeding. A total of 285 patients were included. 69.1 % were older than 60 years, 73.3 % had hypertension, 55.1 % reported use of inflammatory drugs (NSAIDs) and aspirin (ASA), 19.6 % reported previous bleeding episodes, and 17.9 % had hemodynamic instability. 63 patients (22.1 %) required endoscopic hemostasis, and 32 (11.2 %) experienced rebleeding. Overall mortality reported was 13.1 % of which 55.3 % were men. Mortality attributable to gastrointestinal bleeding was 3.1 %. Conclusions: The majority of patients served by the HUS with upper GI bleeding are adults over 60 years. Peptic ulcers remain the most common diagnosis associated with the use of NSAIDs and ASA. The mortality rate is comparable to international standards. © 2013 Asociaciones Colombianas de Gastroenterología

Tuberculosis esofágica: Informe de un caso

We report the case of an immune-competent man with symptoms of upper gastrointestinal bleeding secondary to esophageal ulcers of tubercular origin. Gastrointestinal involvement from Mycobacterium tuberculosis is rare even in patients with numerous occurrences of pulmonary and extrapulmonary diseases. The most frequently affected sites are the terminal ileum and the peritoneum. Esophageal tuberculosis is exotic and is usually secondary to extension from neighboring infected organs such as the mediastinal nodes and/or the bronchi. Clinical, endoscopic and radiological pictures of the esophageal disease often mimic malignancy. Tuberculosis treatment is the mainstay of treatment, and surgery is rarely required. © 2014 Asociaciones Colombianas de Gastroenterología, Endoscopia digestiva, Coloproctología y Hepatología

Tuberculosis esofágica: Informe de un caso

We report the case of an immune-competent man with symptoms of upper gastrointestinal bleeding secondary to esophageal ulcers of tubercular origin. Gastrointestinal involvement from Mycobacterium tuberculosis is rare even in patients with numerous occurrences of pulmonary and extrapulmonary diseases. The most frequently affected sites are the terminal ileum and the peritoneum. Esophageal tuberculosis is exotic and is usually secondary to extension from neighboring infected organs such as the mediastinal nodes and/or the bronchi. Clinical, endoscopic and radiological pictures of the esophageal disease often mimic malignancy. Tuberculosis treatment is the mainstay of treatment, and surgery is rarely required. © 2014 Asociaciones Colombianas de Gastroenterología, Endoscopia digestiva, Coloproctología y Hepatología