bio detection of anoxia in lake xochimilco using modified
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Bio detection of anoxia in Lake Xochimilco using modified Escherichia coli
by GenetiX
Instituto Tecnológico y de Estudios Superiores de Monterrey, Campus Ciudad de México
Our Team
Background Xochimilco:
• Source of water for the Metropolitan Area
• Highly touristic and agricultural element
• World Heritage Site
• Local endemic species in danger of extinction
• Highly polluted with indutrial residues
• Critical levels of dO2 below minimun requirements
• Artificial eutrophication
What is Eutrophication?
Dissolved Oxygen
Less than 3 mg/L
Movement of water
Temperature
Salinity
Pressure
Photosynthesis
Respiration
Eutrophication
Factors
Water
Xochimilco
6 mg/L
Eutrophication
Increased Photosynthesis
Nutrient Fertilizers
Nitrogen and Phosphorus
Blocking of light to littoral zone
Microbial decomposition
Depletion of dissolved oxygen
Hypoxia Less than 2.8mg/L
Indicators Chlorophyl
Parameter Oligotrophic Eutrophic
Average total phosphorus 8.0 84.4
Average total nitrogen 661 1875
Average Chlorophyll a 1.7 14.3
Chlorophyll a. peak concentration 4.2 42.6
Objective
Detection of anormal ferric and anoxia/hipoxia
levels on water samples from the Xochimilco Lake by
using biosensors
O2Prom
2 ppm>[O2]
2 ppm<[O2]
Fe Prom
0.5ppm>[Fe]
0.5ppm<[Fe]
Topic
Biosensors:
• Fast response in time
• Fast and continuous measurement
• High specificity (shape-specific
recognition)
• Simplicity in its use
• Capability of measuring
concentrations ranging from 10-18 to
10-19 M, so we need low sample
requirements
• Real time measurements
Justification
• Acceptable levels of disolved iron in water: 0.5
ppm
• Iron promoter minimal iron dissolution
concentration: 1 ppm
• Oxygen Promoter Works in dO2 concentrations
over 0.2 ppm
• dO2 levels in Xochimilco vary around 3 ppm
• Minimal requirement of dO2 for wild-life
sustainance 6 ppm
• Detection of quantitative values of GFP and RFP
by Flow Cytometry
Our Biosensor
Methodology & Results
A B
+ Bacteria
Transformation
20 hours
37° C
A B A B
A
B
Concentrated DNA
A
B
Transformed Bacteria
Heat Shock
Methodology & Results A B
Concentrated DNA
Check +enzymes
+Enzymes
Expected Pattern
Agarose Gel
Cut Bands A
B Ligation
A B
Methodology & Results
Oxygen Promoter + G.F.P
Iron Promoter + G.F.P
Oxygen Promoter + mR.F.P.
EcoRI Pstl
Discussions
Conclusions
Construction of biosensors was not completed
due to what appear to be flawed ligations
and/or low efficiency competent cells.
Future Work
Completion of the biosensors
Proof of concept growing bacteria in absence
and presence of stimuli
Quantitative measurement of disolved O₂ and
Fe in various concentrations for construction of
a photoluminescent scale.
Application of biosensors to a range of samples
from specific points distributed all along
Xochimilco lake.
Posada Tec 2013
Travesuras 2014
Synthetic Biology Conference
Thanks
ITESM CCM
Hidrosina
GoNext Project
Tecnologico de Monterrey campus Mty.
Nautilus
Tolerantum
QFB. Isabel Coria
Special Thanks
Luis Vaca Dominguez M.D. Ph. D.
Alicia Sampieri García Ph. D.
M.Sc. Lamberto Álvarez-Palacios
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