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- | <html lang="en" dir="ltr" class="client-nojs"> | + | <!DOCTYPE html> |
- | <title>GenetiX</title> | + | <html> |
| + | <head> |
| + | <meta content="text/html; charset=utf-8" http-equiv="content-type"> |
| + | <title>GenetiX</title> |
| + | <link href="http://fonts.googleapis.com/css?family=Source+Sans+Pro:300,300italic,600%7CSource+Code+Pro" |
| | | |
- | <h2 id="Home">Welcome to our wiki</h2>
| + | rel="stylesheet"> |
- | <p>We are high school students at Tecnológico de Monterrey, Mexico
| + | <!--[if lte IE 8]><script src="html5shiv.js" type="text/javascript"></script><![endif]--> |
- | City Campus, a team with juniors and seniors working together.
| + | <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script> |
- | What made us a team was our passion for science, we all wanted to
| + | <script src="js/jquery.dropotron.min.js"></script> |
- | innovate, to create, to surprise and engine something useful. Our
| + | <script src="skel.min.js"> |
- | goal is to prove that if you plan on doing something, no matter
| + | { |
- | what, you can achieve it with the right focus.</p>
| + | prefix: 'css/style', |
- | <h2>Biodetection of Anoxia in Lake Xochimilco</h2>
| + | preloadStyleSheets: true, |
- | <p>Lake Xochimilco in Mexico City faces a condition of extreme
| + | resetCSS: true, |
- | pollution which endangers the endemic species; many of which are
| + | boxModel: 'border', |
- | nearing extinction. Oxygen levels depletion in the lake directly
| + | grid: { gutters: 30 }, |
- | affect the fauna, making it less hospitable or even deadly. Our
| + | breakpoints: { |
- | goal is to produce a biosensor that can easily and inexpensively
| + | wide: { range: '1200-', containers: 1140, grid: { gutters: 50 } }, |
- | detect anoxia in different regions of the lake. Using an oxygen
| + | narrow: { range: '481-1199', containers: 960 }, |
- | promoter in addition with the biological markers RFP and GFP we
| + | mobile: { range: '-480', containers: 'fluid', lockViewport: true, grid: { collapse: true } } |
- | could theoretically detect low dissolved oxygen levels in water
| + | } |
- | samples. In addition, we intend to use a second construct with an
| + | } |
- | Iron promoter to detect iron concentrations that also endanger the
| + | </script> |
- | sustainability of living organisms in the lake. Once we identify
| + | <script> |
- | critical regions of the Lake, our report could incentivize the
| + | $(function() { |
- | Civil Council and authorities to propose concrete legal
| + | |
- | initiatives to reduce pollution in the identified areas and start
| + | |
- | remediation campaigns.</p>
| + | |
| | | |
- | <h2>Contents</h2> | + | // Note: make sure you call dropotron on the top level <ul> |
| + | $('#main-nav > ul').dropotron({ |
| + | offsetY: -10 // Nudge up submenus by 10px to account for padding |
| + | }); |
| | | |
- | <ul> | + | }); |
| + | </script> |
| + | <script> |
| + | // DOM ready |
| + | $(function() { |
| + | |
| + | // Create the dropdown base |
| + | $("<select />").appendTo("nav"); |
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| + | // Create default option "Go to..." |
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| + | "selected": "selected", |
| + | "value" : "", |
| + | "text" : "Menu" |
| + | }).appendTo("nav select"); |
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| + | "value" : el.attr("href"), |
| + | "text" : el.text() |
| + | }).appendTo("nav select"); |
| + | }); |
| + | |
| + | // To make dropdown actually work |
| + | // To make more unobtrusive: http://css-tricks.com/4064-unobtrusive-page-changer/ |
| + | $("nav select").change(function() { |
| + | window.location = $(this).find("option:selected").val(); |
| + | }); |
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| + | </head> |
| + | <body> |
| + | <div id="header_container"> |
| + | <div class="container"> <!-- Header --> |
| + | <div id="header" class="row"> |
| + | <div class="4u"> |
| + | <h1><img src="https://static.igem.org/mediawiki/2014hs/c/c9/Logo.png" alt="" usemap="#Map" height="101" width="301"> |
| + | <map name="Map"> |
| + | <area shape="rect" coords="-1,19,68,81" href="https://2014hs.igem.org/Main_Page" |
| | | |
- | <li><a href="#Home">Home</a></li> | + | target="_blank" alt="logo"> |
- | <li><a href="#project">The Project</a> | + | <area shape="rect" coords="68,3,300,103" href="index.html"> |
| + | </map> |
| + | </h1> |
| + | </div> |
| + | <nav id="main-nav" class="8u"> |
| + | <ul> |
| + | <li><a class="active" href="index.html">Home</a></li> |
| + | <li><a href="project.html">The Project</a> |
| <ul> | | <ul> |
- | <li><a href="#biosensor">Biosensor</a></li> | + | <li><a href="project_biosensor.html">Biosensor</a></li> |
- | <li><a href="#eutrophication">Eutrophication</a></li> | + | <li><a href="project_eutrophication.html">Eutrophication</a></li> |
- | <li><a href="#localization">Localization</a></li> | + | <li><a href="project_localization.html">Localization</a></li> |
| </ul> | | </ul> |
| </li> | | </li> |
- | <li><a href="#results">Results</a></li> | + | <li><a href="results.html">Results</a> </li> |
- | <li><a href="#human_practices">Human Practices</a> | + | <li><a href="#">Human Practices</a> |
| <ul> | | <ul> |
- | <li><a href="#travesuras2014">Travesuras | + | <li><a href="human_practices_travesuras2014.html">Travesuras |
- | 2014</a></li>
| + | 2014</a></li> |
- | <li><a href="#travesuras2013">Travesuras | + | <li><a href="human_practices_travesuras2013.html">Travesuras |
- | 2013</a></li>
| + | 2013</a></li> |
- | <li><a href="#conference">Conference</a></li> | + | <li><a href="human_practices_conference.html">Conference</a><a |
| + | |
| + | href="human_practices_travesuras2014.html"></a></li> |
| </ul> | | </ul> |
| </li> | | </li> |
- | <li> <a href="#Data">Data</a> | + | <li> <a href="#">Data</a> |
| <ul> | | <ul> |
- | <li><a href="#safety">Safety</a></li> | + | <li><a href="data_safety.html">Safety</a></li> |
- | <li><a href="#notebook">Notebook</a></li> | + | <li><a href="data_notebook.html">Notebook</a></li> |
- | <li> <a href="#biobricks">Biobricks</a></li> | + | <li> <a href="data_biobricks.html">Biobricks</a></li> |
| </ul> | | </ul> |
| </li> | | </li> |
- | <li><a href="#team">The Team</a> | + | <li><a href="#">The Team</a> |
| <ul> | | <ul> |
- | <li><a href="#members">Members</a></li> | + | <li><a href="team_members.html">Members</a></li> |
- | <li><a href="#sponsors">Sponsors</a></li> | + | <li><a href="team_sponsors.html">Sponsors</a> </li> |
| </ul> | | </ul> |
| </li> | | </li> |
- | </ul> | + | </ul> |
| + | </nav> |
| + | </div> |
| + | </div> |
| + | </div> |
| + | <div id="site_content"> |
| + | <div class="container"> |
| + | <!-- Banner --> |
| + | <div id="banner"> <a href="#"><img src="https://static.igem.org/mediawiki/2014hs/2/2d/Bannergg.png" alt="banner image"></a> |
| + | </div> |
| + | <!-- Features --> |
| + | <div class="row"> |
| + | <section class="8u"> |
| + | <h1>Welcome to our wiki</h1> |
| + | <p>We are high school students at Tecnológico de Monterrey, Mexico |
| + | City Campus, a team with juniors and seniors working together. |
| + | What made us a team was our passion for science, we all wanted to |
| + | innovate, to create, to surprise and engine something useful. Our |
| + | goal is to prove that if you plan on doing something, no matter |
| + | what, you can achieve it with the right focus.</p> |
| + | <h2>Biodetection of Anoxia in Lake Xochimilco</h2> |
| + | <p>Lake Xochimilco in Mexico City faces a condition of extreme |
| + | pollution which endangers the endemic species; many of which are |
| + | nearing extinction. Oxygen levels depletion in the lake directly |
| + | affect the fauna, making it less hospitable or even deadly. Our |
| + | goal is to produce a biosensor that can easily and inexpensively |
| + | detect anoxia in different regions of the lake. Using an oxygen |
| + | promoter in addition with the biological markers RFP and GFP we |
| + | could theoretically detect low dissolved oxygen levels in water |
| + | samples. In addition, we intend to use a second construct with an |
| + | Iron promoter to detect iron concentrations that also endanger the |
| + | sustainability of living organisms in the lake. Once we identify |
| + | critical regions of the Lake, our report could incentivize the |
| + | Civil Council and authorities to propose concrete legal |
| + | initiatives to reduce pollution in the identified areas and start |
| + | remediation campaigns.</p> |
| + | </section> |
| + | <section class="4u"> |
| + | <div id="sidebar"> |
| + | <section class="12u"> |
| + | <h5 class="12u italic"><img src="https://static.igem.org/mediawiki/2014hs/2/2a/Lp.png" alt="" class="center" |
| | | |
- | <h2 id="project">The Project</h2>
| + | height="250" width="250"></h5> |
- | <p><a href="#"><img src="https://static.igem.org/mediawiki/2014hs/e/ea/Project.jpg" alt="banner image" width="900"></a></p> | + | <h5 class="12u italic"><strong><em>"I am utterly convinced that |
- | <p>The main idea of our project is to achieve the detection of | + | Science and Peace will triumph over Ignorance and War, |
- | anoxia and Iron concentrations in water systems. What we propose | + | that nations will eventually unite not to destroy but to |
- | is to construct an easy way of monitoring the levels of O2 and Fe
| + | edify, and that the future will belong to those who have |
- | in the lake by using biosensors. By using modified bacteria <em>E.
| + | done the most for the sake of suffering humanity.</em></strong><em>"</em></h5> |
- | coli</em> for this, we will try to find a cheaper, easier,
| + | <p><em class="12u right">Louis Pasteur</em></p> |
- | and faster way to detect the problem of anoxia and iron
| + | </section> |
- | concentration in some aquifers of Mexico City. We will have to
| + | <section class="12u"> </section> |
- | analyze samples of water at different depths to know where the
| + | </div> |
- | problem is worse and what probable native species could be more
| + | </section> |
- | affected.</p> | + | </div> |
- | <p><br> | + | </div> |
- | Our purpose is the identification of adequate dissolved oxygen
| + | </div> |
- | levels for a stable support of life and the identification of iron
| + | <div id="footer_container"> |
- | concentration below threatening levels in order to know if the
| + | <div class="container"> |
- | lake has the physical and chemical properties to support wild-life
| + | <!-- Footer --> |
- | naturally. With the use of biosensors, specialized for detecting
| + | <footer> |
- | concentrations of oxygen above a 2% dissolution, we used modified
| + | <p><a href="https://twitter.com/GenetiXCCM" target="_blank"><img src="https://static.igem.org/mediawiki/2014hs/f/f7/Twitter.png" |
- | E. coli with an oxygen promoter (BBa_K258005) that will
| + | |
- | detect the low concentrations and a reporter of (GFP or RFP) that
| + | |
- | will indicate the activation of our promoter (<strong>Figure 1</strong>).
| + | |
- | The Iron promoter reacts inside an environment with a
| + | |
- | concentration of iron ranging from 1 ppm and on (A.
| + | |
- | Quintero,2007). The acceptable levels of iron in drinkable water
| + | |
- | are lower than 0.5 ppm (WHO, 1996).</p>
| + | |
- | <p align="center"><img src="https://static.igem.org/mediawiki/2014hs/0/07/Project_figure1.png" alt="" height="326"
| + | |
| | | |
- | width="300"></p> | + | alt="twitter"></a> <a href="https://www.facebook.com/pages/Genetix/231542983696246" |
- | <p> To achieve the objective using <em>E. Coli</em> we will
| + | |
- | construct different types of modified plasmids for our bacteria to
| + | |
- | express the biosensors based on iGem biobricks. The idea is to use
| + | |
- | sensitive promoters: one for oxygen, and another one for iron;
| + | |
- | those promoters will lead to an expression of GFP or mRFP. This
| + | |
- | will provide a visual signal to indicate the presence or absence
| + | |
- | of these elements. Biobrick parts BBa_K258005 (O₂ prom),
| + | |
- | BBa_I765000 (Fe prom), BBa_E1010 (GFP) and BBa_J04650 (mRFP) were
| + | |
- | selected for the construction of the biosensors (<strong>Figure 2</strong>).
| + | |
- | These were transformed into E. <em>coli</em> strands DH5-a, TOP
| + | |
- | 10, and NEB 10-b for storage and subsequent plasmid growth and
| + | |
- | isolation using a Zymo Research® DNA extraction kit.</p>
| + | |
- | <p align="center"><img src="https://static.igem.org/mediawiki/2014hs/2/22/Project_figure2.png" alt="" height="124"
| + | |
| | | |
- | width="350"></p>
| + | target="_blank"><img src="https://static.igem.org/mediawiki/2014hs/5/55/Facebook.png" alt="facebook"></a> <a |
- | <p> Once we measure and identify critical regions of the Lake, our
| + | |
- | report could go directly to the Citizen Council for its
| + | |
- | consideration. The competent authorities should be able to propose
| + | |
- | concrete legal initiatives to reduce pollution in the identified
| + | |
- | areas and start remediation campaigns that re-establish the local
| + | |
- | aquatic environment to a stable, liveable, friendly ecosystem for
| + | |
- | the inhabitant species. </p>
| + | |
- | <h2 id="biosensor">Biosensor</h2>
| + | |
- | <p><a href="#"><img src="https://static.igem.org/mediawiki/2014hs/4/47/Biosensors.jpg" alt="banner image" width="900"></a></p>
| + | |
- | <p>A biosensor is an instrument for the measurement of biological or
| + | |
- | chemical parameters. They usually combine biological and | + | |
- | physical-chemical components.</p>
| + | |
- | <p><br>
| + | |
- | Generally, they consist of three parts:</p>
| + | |
- | <ul>
| + | |
- | <li>The biological sensor: It may be a tissue, a culture of
| + | |
- | microorganisms, enzymes, antibodies, nucleic acid chains, etc.
| + | |
- | The sensor can be taken from the wild or be a product of
| + | |
- | synthetic biology.</li>
| + | |
- | <li>The transducer: Its function is to bind the other two elements
| + | |
- | and translate the signal emitted by the sensor.</li>
| + | |
- | <li>The detector: It can be optical, piezoelectric, thermal,
| + | |
- | magnetic, etc.</li>
| + | |
- | </ul>
| + | |
- | <p>The most common example is a biosensor that measures blood
| + | |
- | glucose. It uses an enzyme that processes glucose molecules,
| + | |
- | releasing an electron for each molecule. Said electron is
| + | |
- | collected at one electrode and the electron flow is used as a
| + | |
- | measure of the glucose concentration.</p>
| + | |
- | <p><img src="https://static.igem.org/mediawiki/2014hs/8/81/Canary.jpg" alt="" height="382" width="500"><br>
| + | |
- | The caged canaries used by miners to detect the presence of lethal
| + | |
- | gases can be seen as an early example of biosensors (Wikipedia,
| + | |
- | 2014)</p>
| + | |
- | <p><br>
| + | |
- | By using modified bacteria E. coli for this, we will try to find a
| + | |
- | cheaper, easier, and faster way to detect the problem of anoxia
| + | |
- | and heavy metals in some aquifers of Mexico City. We will have to
| + | |
- | analyze samples of water at different depths to know where the
| + | |
- | problem is worse and what probable native species could be more
| + | |
- | affected.</p>
| + | |
- | <p><br>
| + | |
- | Some of the benefits of using biosensors instead of other sensing
| + | |
- | methods, as observed by Ajit Sadana and AzoSensors, are: </p>
| + | |
- | <ul>
| + | |
- | <li>A fast response in time.</li>
| + | |
- | <li>Fast and continuous measurement.</li>
| + | |
- | <li>High specificity because of its shape-specific recognition.</li>
| + | |
- | <li>Simplicity in its use.</li>
| + | |
- | <li>Capability of measuring concentrations ranging from 10<sup>-18</sup> to 10<sup>-19</sup> M, so we need low sample requirements.</li>
| + | |
- | <li>Capability of real time measurements.</li>
| + | |
- | </ul>
| + | |
- | <p></p>
| + | |
- | <h2>Eutrophication</h2>
| + | |
- | <p><a href="#"><img src="https://static.igem.org/mediawiki/2014hs/b/b4/Eutrophication.jpg" alt="banner image" width="900"></a></p>
| + | |
- | <p>Eutrophication is the process by which the increased availability
| + | |
- | of one or more limiting growth factors needed for photosynthesis
| + | |
- | cause excessive plant and algal growth. Some of these factors are
| + | |
- | the amount of carbon dioxide, sunlight and nutrient fertilizers.
| + | |
- | The elements coming from the nutrient fertilizers that especially
| + | |
- | affect the photosynthesis rate are nitrogen and phosphorus.
| + | |
- | (Chislock , 2013)<br>
| + | |
- | Plants require many different nutrients or components for the
| + | |
- | realization of photosynthesis. Nitrogen and phosphorus are the
| + | |
- | first components depleted in the water even though there is a
| + | |
- | greater amount of other needed substances. While performing
| + | |
- | photosynthesis about 8 times more nitrogen is needed than
| + | |
- | phosphorus. Thus, phosphorus limits eutrophication if nitrogen is
| + | |
- | more than 8 times abundant as phosphorus, while nitrogen is the
| + | |
- | limiting factor when its concentration is less than 8 times
| + | |
- | abundant as phosphorus. Erosion of surrounding areas is also an
| + | |
- | important cause of eutrophication because the nutrients of the
| + | |
- | ground are not retained by the roots of plants and trees that
| + | |
- | should be there. So deforestation is an environmental element that
| + | |
- | strongly affects this process. (UNEP, 1)<br>
| + | |
- | The process of eutrophication of an aquifer occurs naturally over
| + | |
- | centuries as they are filled with sediments, abundant in nutrients
| + | |
- | (figure 1). However, this process has been recently much
| + | |
- | accelerated due to the contamination produced by human activities.
| + | |
- | The discharges into aquatic systems bring a lot of limiting
| + | |
- | nutrients for eutrophication, including nitrogen and phosphorus.
| + | |
- | These polluting human residues thrown up into water systems come
| + | |
- | from point and non-point pollution sources. (Chislock, 2013)</p>
| + | |
- | <p><img src="https://static.igem.org/mediawiki/2014hs/d/df/Project_eutrophication_clip_image001.jpg" alt=""
| + | |
| | | |
- | height="161" width="314"></p>
| + | href="mailto:genetixccm@gmail.com?Subject=Hi%20GenetiX" target="_top"><img |
- | <p>Figure 1. Natural eutrophication</p>
| + | |
- | <p> The term “point source” is referred to
| + | |
- | as any single, discernible source from where the polluting agent
| + | |
- | is originated, such as a discharge pipe from a factory, sewage
| + | |
- | plant. The other term “non-point source” means that the pollution
| + | |
- | does not come from a single determinate source. This type of
| + | |
- | pollution happens when water moves across the land and pick in its
| + | |
- | way human-made pollutants that can be deposited later on in water
| + | |
- | bodies. (Harvey, 1) <br>
| + | |
- | There are different levels of eutrophication according to how
| + | |
- | severe or advanced the process is. The first and harmless
| + | |
- | classification of eutrophication is the oligotrophic, where there
| + | |
- | is a low concentration of nutrients in the water and thus less
| + | |
- | biologic production. Then we have the mesotrophic where there are
| + | |
- | intermediate levels of nutrient concentrations and there is a
| + | |
- | moderate biologic production that doesn´t affect severely the
| + | |
- | aquatic environment. The real problem begins when we get to the
| + | |
- | eutrophic level where there is an elevated concentration of
| + | |
- | nutrients and a very high biologic productivity. Another
| + | |
- | classification is reserved for where the nutrient levels reach
| + | |
- | extremely dangerous concentrations that take the aquifer´s
| + | |
- | condition to a critical state; it is called hypertrophic and is
| + | |
- | almost always caused by the cultural eutrophication. An important
| + | |
- | indicator for the eutrophication level is chlorophyll. The total
| + | |
- | amount of chlorophyll represents about 1% of plant biomass, so in
| + | |
- | this way the total biomass can be estimated allowing the
| + | |
- | determination of the degree of eutrophication. (Mazzeo, 1)</p>
| + | |
- | <p><img src="https://static.igem.org/mediawiki/2014hs/0/03/Project_eutrophication_clip_image002.jpg" alt=""
| + | |
| | | |
- | height="164" width="568"></p> | + | src="https://static.igem.org/mediawiki/2014hs/0/09/Rss.png" alt="rss"></a></p> |
- | <p>Table expressing the characteristic values for each of the
| + | <p><a href="http://www.itesm.mx/wps/wcm/connect/Campus/CCM/Ciudad+de+Mexico/" |
- | eutrophication classifications. (UNEP)<br>
| + | |
- | Eutrophication brings a lot of complications to aquifers. The
| + | target="_blank"><img src="https://static.igem.org/mediawiki/2014hs/3/3a/Itesm_ccm.png" alt="" height="64" |
- | enormous creation of dense blooms of noxious, foul-smelling
| + | |
- | phytoplankton reduces water clarity and harms water clarity. These
| + | width="176"></a><a href="http://www.hidrosina.com.mx/new/" target="_blank"><img |
- | blooms limit light penetration to the water body. This limiting of
| + | |
- | sunlight to littoral zones causes the die-offs of the great amount
| + | src="https://static.igem.org/mediawiki/2014hs/5/5d/Hidrosina.png" alt="" height="32" width="110"></a></p> |
- | of plants and algae that grew up without control due to
| + | <p>Copyright © GenetiX | <a href="http://skeljs.org/">skel.js</a> | <a |
- | eutrophication. When these dense algal blooms eventually die,
| + | |
- | microorganisms start the decomposition of organic matter and
| + | href="http://www.css3templates.co.uk">design from |
- | severely deplete the available dissolved oxygen, causing hypoxia
| + | css3templates.co.uk</a></p> |
- | or even anoxia. These hypoxic environments are cause of dead zones
| + | </footer> |
- | for most of the inhabiting organisms for the lacking oxygen.
| + | </div> |
- | (Chislock 2013)<br>
| + | </div> |
- | The normal levels of dissolved oxygen in water for the maintenance
| + | </body> |
- | of life are around 6mg/L. Environments are considered hypoxic when
| + | |
- | the concentration of dissolved oxygen goes below 2.8 mg/L. When
| + | |
- | the dissolved oxygen levels reach the hypoxic condition many
| + | |
- | species die. Depending on the size and other characteristics of
| + | |
- | the organisms, the limiting concentration for survival will have
| + | |
- | low variations. The hypoxic conditions can change in different
| + | |
- | lapses of time. They can occur just for a few moments
| + | |
- | (minutes/hours) or they can reach chronic states that last for
| + | |
- | weeks or even months, causing depletion of local species.
| + | |
- | (Cisterna 2008)<br>
| + | |
- | It is important to supervise aquatic environments conditions´ to
| + | |
- | prevent the initiation of eutrophic conditions. Eutrophication can
| + | |
- | kill all life in natural environments. If some symptoms of
| + | |
- | eutrophication are detected in time it is possible to attack the
| + | |
- | problem and control it, or even eliminate it. Some methods for
| + | |
- | controlling eutrophication are:</p>
| + | |
- | <ul>
| + | |
- | <li>Covering sediments, preventing release of nutrients.</li>
| + | |
- | <li>Biomanipulation</li>
| + | |
- | <li>Using chemicals such as copper sulfate to kill excess of algae</li>
| + | |
- | <li>Aerating the hypolimnion of a lake, reducing the release of
| + | |
- | nutrients from the sediments.</li>
| + | |
- | </ul>
| + | |
- | <p>(UNEP)</p>
| + | |
- | <h2>Localization</h2>
| + | |
- | <p><a href="#"><img src="https://static.igem.org/mediawiki/2014hs/f/f1/Localization.jpg" alt="banner image" width="900"></a></p>
| + | |
- | <p>First of all, we have to know what eutrophication is, well | + | |
- | the eutrophication is the process of excessive growth of
| + | |
- | algae and weeds water in the water, caused by phosphates and other
| + | |
- | pollutants discharged to waters. In a eutrophic aquatic ecosystem
| + | |
- | two things happen: more oxygen is required to break down and
| + | |
- | increases the population of organisms known as primary producers:
| + | |
- | organisms that make photosynthesis, as macroalgae and lilies.
| + | |
- | These can reach atrophy processes exchange of oxygen and water
| + | |
- | flow. The liquid is cloudy and the lack of oxygen can devastate
| + | |
- | populations of various organisms.</p>
| + | |
- | <h3>How does it affect the lake of Xochimilco?</h3>
| + | |
- | In hydrological Xochimilco area that is located south of the
| + | |
- | metropolitan area of Mexico City's 189 miles of canals that have
| + | |
- | been contaminated by the contribution of sewage, domestic waste,
| + | |
- | industrial, agricultural and drainage system leaks. This has
| + | |
- | affected different species of living beings that inhabit the area,
| + | |
- | causing a decline in biodiversity (Juárez-Figueroa et al., 2003).<br>
| + | |
- | <br>
| + | |
- | It is estimated that close to urban centers or agricultural nutrient
| + | |
- | input to a lake can be accelerated by the activities human, a
| + | |
- | process known as cultural eutrophication, which is the case with
| + | |
- | Lake Xochimilco to be within the city of Mexico. This is precisely
| + | |
- | effluent mainly caused by plants sewage treatment, containing
| + | |
- | nitrates and phosphates runoff of fertilizers and waste animals and
| + | |
- | accelerated erosion of eutrophication .The eutrophication derived
| + | |
- | from crops by the recent addition of phosphates and nitrates, as a
| + | |
- | result of activities human, it is also a serious problem for lakes,
| + | |
- | especially Lake Xochimilco. During warm periods, the overhead
| + | |
- | produce dense growth nutrient vegetables such as algae,
| + | |
- | cyanobacteria, water lilies and duckweed. Oxygen dissolved in the
| + | |
- | surface layer of water is near die exhausted when large masses of
| + | |
- | algae, which fall to the bottom and are decomposed by aerobic
| + | |
- | bacteria. This can kill fish and other animals water they consume
| + | |
- | oxygen. If theexcess nutrients continue to flow a body of water, the
| + | |
- | water reaches the bottom be rotten and almost unusable for living
| + | |
- | things, because bacteria take over and produce anaerobic decomposing
| + | |
- | substances with poor odors, such as hydrogen sulfide and the
| + | |
- | methane.<br>
| + | |
- | <h3>Factors</h3>
| + | |
- | <p>The factors affecting the degree of eutrophication are:</p>
| + | |
- | <ul>
| + | |
- | <li>Climate: warm climates favor the process.</li>
| + | |
- | </ul>
| + | |
- | <ul>
| + | |
- | <li>Shallow bodies of water and / or low flow are more conducive
| + | |
- | to the development process</li>
| + | |
- | </ul>
| + | |
- | <ul>
| + | |
- | <li> Drainage Area: little tree cover subject to abundant
| + | |
- | rainfall tions favors erosion and entrainment of nutrients into
| + | |
- | the water body</li>
| + | |
- | </ul>
| + | |
- | <ul>
| + | |
- | <li> Geology: In drainage areas where sedimentary rocks
| + | |
- | predominate vapor no greater phosphorus runoff. Clay soils drain
| + | |
- | poorly and also favor runoff and result in nutrient supply.</li>
| + | |
- | </ul>
| + | |
- | <p><br>
| + | |
- | The causes of eutrophication include:<br>
| + | |
- | <br>
| + | |
- | a) Natural:</p>
| + | |
- | <ul>
| + | |
- | <li> atmospheric inputs: precipitation.</li>
| + | |
- | <li> resuspension of bottom sediments.</li>
| + | |
- | <li> release from anoxic sediments.</li>
| + | |
- | <li> breakdown and excretion of organisms.</li>
| + | |
- | <li> nitrogen-fixing microorganisms.</li>
| + | |
- | </ul>
| + | |
- | <p>b) Anthropogenic:</p>
| + | |
- | <ul>
| + | |
- | <li> Discharges of industrial, agricultural, municipal and | + | |
- | waste treatment plants.</li>
| + | |
- | <li> Deforestation increases erosion and reduces the
| + | |
- | recycling of nutrients in the watershed, increasing their income
| + | |
- | to the water body.</li>
| + | |
- | <li>Fertilizer applied in excess.</li>
| + | |
- | <li>Sewage farms (silos, drums).</li>
| + | |
- | <li>Septic tanks.</li>
| + | |
- | <li>Detergents with large amounts of phosphorus.</li>
| + | |
- | <li>Contribution of pollutants from rainwater.</li>
| + | |
- | <li>Sewer system of cities and towns do.</li>
| + | |
- | <li>Measures to control eutrophication include:</li>
| + | |
- | </ul>
| + | |
- | <p><br>
| + | |
- | Control of nutrient inputs:</p>
| + | |
- | <ul>
| + | |
- | <li>Waste treatment before being poured into the body of water.</li>
| + | |
- | <li>Restricting the use of phosphate detergents.</li>
| + | |
- | <li>Control of land use.</li>
| + | |
- | <li>Prepantanos: remove nutrients from waste water that are fixed
| + | |
- | in the biomass of algae and macrophytes.</li>
| + | |
- | <li>Physical and chemical waste water treatment: chemical
| + | |
- | precipitation and filtration.</li>
| + | |
- | </ul>
| + | |
- | <h3>What we found....<br>
| + | |
- | </h3>
| + | |
- | <p>Elements found in the lake of Xochimilco <br>
| + | |
- | </p>
| + | |
- | <table style="width: 100%; border-spacing: 0px;" border="0">
| + | |
- | <tbody>
| + | |
- | <tr> | + | |
- | <td>Sample</td>
| + | |
- | <td style="margin-left: -77px;">1</td>
| + | |
- | <td>2</td>
| + | |
- | <td>3</td>
| + | |
- | <td>4</td>
| + | |
- | <td>5</td>
| + | |
- | <td>6</td>
| + | |
- | <td>7</td>
| + | |
- | <td>8</td>
| + | |
- | </tr>
| + | |
- | <tr>
| + | |
- | <td>MO mg/LO</td>
| + | |
- | <td>154</td>
| + | |
- | <td>251</td>
| + | |
- | <td>88</td>
| + | |
- | <td>151</td>
| + | |
- | <td>555</td>
| + | |
- | <td>295</td>
| + | |
- | <td>25</td>
| + | |
- | <td>75</td>
| + | |
- | </tr>
| + | |
- | <tr>
| + | |
- | <td>Phosphorus mg/L</td>
| + | |
- | <td>5.8</td>
| + | |
- | <td>5.6</td>
| + | |
- | <td>7.6</td>
| + | |
- | <td>6.7</td>
| + | |
- | <td>23.0</td>
| + | |
- | <td>17.1</td>
| + | |
- | <td>15.0</td>
| + | |
- | <td>14.2</td>
| + | |
- | </tr> | + | |
- | <tr>
| + | |
- | <td>pH</td>
| + | |
- | <td>6.2</td>
| + | |
- | <td>7.2</td>
| + | |
- | <td>6.7</td>
| + | |
- | <td>7.6</td>
| + | |
- | <td>8.0</td>
| + | |
- | <td>7.0</td>
| + | |
- | <td>7.0</td>
| + | |
- | <td>7.0</td>
| + | |
- | </tr>
| + | |
- | <tr>
| + | |
- | <td>Temperature °C</td>
| + | |
- | <td>3.8</td>
| + | |
- | <td>3.8</td>
| + | |
- | <td>4.8</td>
| + | |
- | <td>3.8</td>
| + | |
- | <td>6.9</td>
| + | |
- | <td>7.0</td>
| + | |
- | <td>7.0</td>
| + | |
- | <td>7.0</td>
| + | |
- | </tr>
| + | |
- | <tr>
| + | |
- | <td>Precipitation</td>
| + | |
- | <td>21.0</td>
| + | |
- | <td>20.0</td>
| + | |
- | <td>22.0</td>
| + | |
- | <td>23.0</td>
| + | |
- | <td>21.5</td>
| + | |
- | <td>19.8</td>
| + | |
- | <td>21.0</td>
| + | |
- | <td>54</td>
| + | |
- | </tr>
| + | |
- | <tr>
| + | |
- | <td>MO = Organic Mater</td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | <td><br></td>
| + | |
- | </tr>
| + | |
- | </tbody>
| + | |
- | </table>
| + | |
- | </div>
| + | |
- | <p></p>
| + | |
- | </div>
| + | |
- | </div>
| + | |
- | </div>
| + | |
- | </body> | + | |
| </html> | | </html> |