Fundacion Chile | Date: 2014-03-27
The invention relates to a continuous and modular treatment system for removing boron from natural, urban, rural and irrigation water, made up of a boron removal system together with a resin regeneration system, wherein the treatment system comprises three columns (C-1, C-2, C-3), each column being packed with an ion exchange resin specific for removing boron. Said columns are arranged in series and operate alternatingly in a fining-refining configuration, meaning that two of the three columns are in simultaneous operation in the boron removal system, while the third column is in regeneration. The invention further relates to a method for operating the system, comprising the steps of removing boron and the steps of regenerating the saturated resin.
Uriarte I.,Austral University of Chile |
Iglesias J.,Spanish Institute of Oceanography |
Domingues P.,Spanish Institute of Oceanography |
Rosas C.,National Autonomous University of Mexico |
And 14 more authors.
Journal of the World Aquaculture Society | Year: 2011
The increasing market demand for cephalopods and the experiences obtained with different species has boosted the interest in developing their culture in Latin America. In 2008, an international workshop was held in Puerto Montt, Chile, with 14 experts in experimental cephalopods aquaculture from Brazil, Chile, Spain, and Mexico. Several topics were approached within the holobenthic species Octopus maya and the merobenthic species Enteroctopus megalocyathus, Octopus vulgaris, and Robsonella fontaniana. Part of the conclusions demonstrated that the two greatest difficulties for their production were survival of paralarvae for merobenthic species, and survival of early juveniles for holobenthic species. Besides, there is a need to study the endogenous and exogenous factors affecting health and nutritional status of embryos, paralarvae, and juveniles. These stages, which may limit the culture, should be extensively studied in order to develop the appropriate environmental conditions and culture systems for the physiological and behavioral requirements, from egg incubation up to juveniles to reach a grow-out phase. © by the World Aquaculture Society 2011.
Dantagnan P.,Catholic University of Temuco |
Gonzalez K.,Catholic University of Temuco |
Hevia M.,Fundacion Chile |
Betancor M.B.,University of Stirling |
And 3 more authors.
Aquaculture Nutrition | Year: 2016
Atlantic salmon (Salmo salar) were fed 6 experimental diets containing three levels of arachidonic acid (ARA) (0.18 g kg-1, 0.28 g kg-1 and 0.63 g kg-1 for low, medium and high levels, respectively) and two levels of vitamin E (150 and 730 mg kg-1 for low and high levels, respectively). At the end of the experimental period, fatty acids in the liver and immunity markers (lysozyme activity, respiratory burst and phagocytic activity) were determined and fish subjected to a challenge test against the salmonid rickettsial syndrome (SRS) pathogen. ARA, vitamin E or their interaction did not exert an effect on fish performance, whereas ARA alone clearly increased the deposition of ARA. Dietary vitamin E only enhanced liver vitamin E deposition, while the interaction of ARA and vitamin E influenced lysozyme activity and EPA/ARA ratio pointing out the effect of both nutrients on the fish immune system and metabolism. Only the medium concentration contributed to reducing mortality when the fish were exposed to the SRS pathogen. In conclusion, different levels of supplementation with ARA and vitamin E in the diet had no effect on productivity, but did have effects on immune markers and cumulative mortality when fish were exposed to the SRS pathogen. © 2016 John Wiley & Sons Ltd.
Sa R.,University of Santiago de Chile |
Gavilan M.,University of Santiago de Chile |
Rioseco M.J.,University of Santiago de Chile |
Llancabure A.,Austral University of Chile |
And 3 more authors.
Aquaculture | Year: 2014
A study was undertaken to determine the protein requirements of the Patagonian blennie (Eleginops maclovinus) juveniles as well as the metabolic response of intermediary metabolism enzymes. For this, six isoenergetic and isolipidic diets were formulated, containing different protein levels of inclusion (from 9% to 44% dry weight) based on fish meal. Each diet was assigned to triplicate groups of 40 fish, with an initial mean average weight of 40g, and fed to satiety for 98days. Fish fed the 9% protein diet rejected feed and lost weight at the end of the trial, while the other experimental groups gain weight, being weight gain directly correlated to dietary protein. feed efficiency (FE) increased with dietary protein while protein efficiency ratio (PER) and nitrogen retention (% N intake) remained constant when dietary protein was above 15%. No significant increase of weight gain or nitrogen retention (gkgABW-1day-1) was observed when dietary protein was above 30% of inclusion. Below 30% of dietary protein a significant decrease in digestibility was observed, being the apparent digestibility coefficients (ADCs) of feed, protein and energy compromised at low dietary protein levels. An exponential model of regression best fitted data correlating dietary protein to specific growth rate (SGR) and dietary protein to nitrogen retention (gkgABW-1day-1). Based on that model, dietary protein required for maximum growth and nitrogen retention was 34.7% and 35.7% of inclusion, respectively and dietary protein required for maintenance of growth and body nitrogen was 8.9% and 10.8%, respectively. At the end of the trial differences in whole body weight were observed for fish fed protein levels below 30%, increasing fat content with the increase of dietary protein. No variation pattern was seen for HSI or VI in this experiment. Specific activity of hepatic amino-acid catabolism enzyme ALT significantly varied with dietary protein, while AST and GDH enzymes were not changed by dietary protein. The lipogenic malic enzyme (ME) and glucose-6-P-dehydrogenase (G6PDH) were not correlated with dietary protein, unlike fatty acid synthetase (FAS) which increased with dietary protein. The activity of gluconeogenic enzyme fructose-1,6-biphosphatase (FBPase) augmented with dietary protein, while pyruvate kinase (PK) enzyme decreased when dietary protein was higher than 22%. No significant response to dietary protein was observed for GK and HK enzymes. © 2014 Elsevier B.V.
Agency: European Commission | Branch: FP7 | Program: CP-SICA | Phase: ENERGY.2008.3.2.1 | Award Amount: 4.82M | Year: 2009
The increasing reliance on imported diesel fuels, in addition to annual increases in the quantities of organic wastes are threats to the EU and Latin America. This project (DIBANET) will combat these threats and help to eliminate diesel imports by developing novel technologies that will allow the sustainable production of diesel miscible biofuels from wastes. It will build on the key, complementary, strengths of researchers and industries of both regions to advance this field. This enhancement of co-operation will ensure that the whole process, from feedstock to process residues, is engineered for maximum efficiency. The links between regions will be further enhanced by the establishment of inter-regional student scholarships; 2 large brokerage events to engage all stakeholders; and a summer school for knowledge transfer. DIBANET will increase the yield from biomass, beyond the current art, of levulinic acid, a valuable platform chemical that can be combined with ethanol to make a diesel fuel. Processes will be advanced to utilise the solid residue that remains after the acid-treatment. From this residue treatment process a bio-oil and biochar will result. The bio-oil will be upgraded to produce a diesel miscible biofuel. The biochar will be examined for use as a soil amender for enhanced biomass yields. Advanced analytical techniques to benefit levulinic acid yields will be developed and employed online to allow real-time adjustment of biomass conversion conditions. All of the fuels produced will be tested to ensure compliance with current fuel requirements.
Jimenez E.,Federico Santa María Technical University |
Dorta F.,Federico Santa María Technical University |
Medina C.,Fundacion Chile |
Ramirez A.,Fundacion Chile |
And 2 more authors.
Marine Drugs | Year: 2011
Aqueous and ethanolic extracts obtained from nine Chilean marine macro-algae collected at different seasons were examined in vitro and in vivo for properties that reduce the growth of plant pathogens or decrease the injury severity of plant foliar tissues following pathogen infection. Particular crude aqueous or organic extracts showed effects on the growth of pathogenic bacteria whereas others displayed important effects against pathogenic fungi or viruses, either by inhibiting fungal mycelia growth or by reducing the disease symptoms in leaves caused by pathogen challenge. Organic extracts obtained from the brown-alga Lessonia trabeculata inhibited bacterial growth and reduced both the number and size of the necrotic lesion in tomato leaves following infection with Botrytis cinerea. Aqueous and ethanolic extracts from the red-alga Gracillaria chilensis prevent the growth of Phytophthora cinnamomi, showing a response which depends on doses and collecting-time. Similarly, aqueous and ethanolic extracts from the brown-alga Durvillaea antarctica were able to diminish the damage caused by tobacco mosaic virus (TMV) in tobacco leaves, and the aqueous procedure is, in addition, more effective and seasonally independent. These results suggest that macro-algae contain compounds with different chemical properties which could be considered for controlling specific plant pathogens. © 2011 by the authors; licensee MDPI.
Salas-Leiva J.,University of Chile |
Salas-Leiva J.,Católica del Norte University |
Opazo R.,University of Chile |
Remond C.,University of Chile |
And 3 more authors.
Latin American Journal of Aquatic Research | Year: 2017
A comparative analysis of the cultivable intestinal microbiota of farmed (AF) and wild-caught (WF) Paralichthys adspersus was performed. The 16S rRNA gene was used for taxa identification, and the ITS region for strain differentiation. We detected the presence of Vibrio, Bacillus, Photobacterium, Staphylococcus and Carnobacterium in AF, and Exiguobacterium, Klebsiella, Arthrobacter, Raoultella, Kluyvera, Myroides, Streptococcus, Vagococcus, Staphylococcus, Acinetobacter, Psychrobacter, Lactobacillus, Weissella and Lactococcus in WF. The microbial community was more diverse in WF than in AF. Some bacterial groups were only found in wild-caught fish and may be studied as potential beneficial agents for improving production traits in farmed fish. As the first study of microbiota of P. adspersus, it provides significant information that can potentially help improve farming practices by using strains as species-specific probiotics. © Escuela de Ciencias del Mar. All rights reserved.
Diaz-Villanueva J.,Fundacion Chile |
Robotham H.,Diego Portales University
Latin American Journal of Aquatic Research | Year: 2015
The traditional slaughter procedure of rainbow trout (Onconrhynchus mykiss) by automatic stunning followed by bleeding by cutting gills was compared with an alternative slaughter procedures which involves rapid decreasing temperature (-3.5°C) by immersion in flow-ice without gill bleeding. Muscle pH was measured as an indicator of stress achieved during confinement and sacrifice phases. The capacity of blood retention in the gut and head is proposed as potential sources to assess biosecurity. The average weight of gut and head per fish with the alternative method was 24.4 g higher than the traditional method, equivalent to 1.04% of the body weight of an average specimen. The alternative method accumulated 5.3% more weight in gut per fish than the traditional method and 4.9% more in the head weight than the traditional method. The amount of blood retained in the gut and head with the alternative method represented 44.6% of total shed by the traditional method. For a forecast of 900,000 ton of salmonids in 2014, the blood retained in gut and head was estimated in at least 9,630 ton. No significant differences in muscle pH between the two methods were observed. The pH of the fish in the confinement point was equal to 7.06 decreasing approximately to 6.5 in the sacrifice phase independent of the method employed. The alternative method does not produce instant death of the fish; however, it has more capacity than the traditional method to retained blood in gut and head to be used in increasing biosecurity and if combined with more efficient methods to achieve rapid unconsciousness, e.g. electrical stunning, we would have a combined sacrifice method useful to improve current methods. The proposal for more efficient and effective slaughter methods of fish is an open issue that requires further investigations. Keywords: Onconrhynchus mykiss, rainbow trout, pH, stress, slaughter, gill cut, biosecurity. © 2015, Escuela de Ciencias del Mar. All rights reserved.
Gomez J.,Ministry of the Environment of Chile |
De La Maza C.,Fundacion Chile |
Melo O.,University of Santiago de Chile
Water Policy | Year: 2014
An important challenge for policymakers worldwide is how to respond to increasing water demand while still assuring healthy ecosystems via 'environmental flows'. In the case of Chile, increasing water demand and frequent water supply shortages are putting pressure on ecosystem water requirements. On the other hand, new environmental regulations are being implemented to improve the quality of several bodies of water. Consequently, there is a call for water policies that can properly tackle these complex issues. The purpose of this paper is to estimate the costs of a programme to buy back water rights to restore an environmental flow in the Maipo River, as well as assess the performance of 'pollution-dilution' as a measure to comply with water quality standards in the river's basin. Results suggest that a programme that aims to buy back 440 l/s requires expending US$1.9 million, as a one-time expense. We also find that buying and leaving water flows in the river for the distinct purpose of pollution-dilution could be an efficient policy, albeit limited in impact, to reduce nutrient contamination costing about one-fifth of alternative measures to attain the same level of pollution reduction. © IWA Publishing 2014.
PubMed | Fraunhofer Chile Research, University of Talca, Laboratorio Of Biotecnologia En Acuicultura and Fundacion Chile
Type: Letter | Journal: Journal of mass spectrometry : JMS | Year: 2016
Piscirickettsia salmonis is a pathogenic bacteria known as the aetiological agent of the salmonid rickettsial syndrome and causes a high mortality in farmed salmonid fishes. Detection of P. salmonis in farmed fishes is based mainly on molecular biology and immunohistochemistry techniques. These techniques are in most of the cases expensive and time consuming. In the search of new alternatives to detect the presence of P. salmonis in salmonid fishes, this work proposed the use of MALDI-TOF-MS to compare serum protein profiles from Salmo salar fish, including experimentally infected and non-infected fishes using principal component analysis (PCA). Samples were obtained from a controlled bioassay where S. salar was challenged with P. salmonis in a cohabitation model and classified according to the presence or absence of the bacteria by real time PCR analysis. MALDI spectra of the fish serum samples showed differences in its serum protein composition. These differences were corroborated with PCA analysis. The results demonstrated that the use of both MALDI-TOF-MS and PCA represents a useful tool to discriminate the fish status through the analysis of salmonid serum samples.