Microbial Soil Sensors for Non-Invasive Subsurface Analyte Detection
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Solution Overview
Problem
Detecting analytes in subsurface soil is challenging for existing microbial biosensors, as they often require direct soil sampling and can be disruptive, making it difficult to assess subsurface conditions without disturbance.
Innovation Solution
A microbial biosensor system comprising a sensor bacterium, signal propagation bacterium, and display bacterium is used to detect analytes in subsurface soil by producing and amplifying signal molecules, which are observable at the soil surface, potentially aided by filamentous fungi to facilitate migration and signal transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct soil sampling is used for analyte detection, then measurement precision is improved, but the soil structure is disturbed and the detection process becomes more complex
Solution Approach 1:
The patent uses engineered bacteria as intermediary agents that migrate into the subsurface soil and detect analytes in situ. These bacteria serve as mediators between the detection system and the subsurface environment, allowing non-invasive measurement by having the bacteria naturally inhabit and report on the soil conditions without requiring physical sampling or disruption of the soil structure.
2Object-affected harmful factors
If non-invasive detection methods are used, then soil structure is preserved, but measurement precision for subsurface analytes deteriorates
Solution Approach 1:
The engineered bacteria are equipped with self-propulsion capabilities and self-directed migration toward target analytes using their natural motility and chemotaxis mechanisms. The bacteria autonomously navigate through the subsurface soil to locate and detect analytes, eliminating the need for external intervention or soil disruption while maintaining high measurement precision through their inherent ability to reach and sense target molecules in situ.
3Measurement precision
If multiple bacterial components are used for signal amplification, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple bacterial components (sensor bacteria, signal propagation bacteria, and display bacteria) into a single integrated biosensor system where each component performs a specific function in the detection cascade. The sensor bacteria detect the analyte, the signal propagation bacteria amplify the signal through quorum sensing mechanisms, and the display bacteria produce observable fluorescent signals. This merging of functions into a coordinated multi-component system achieves high detection sensitivity while managing complexity through functional specialization and cooperative interaction among the bacterial components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables non-invasive detection of subsurface analytes, such as explosives and pollutants, by using genetically engineered bacteria that produce observable signals like fluorescence, allowing for safe and efficient soil assessment without disturbing the soil structure.
Implementation Method 1
it is possible to genetically program bacteria to elicit certain observable behavior through mechanisms such as quorum sensing
Implementation Method 2
the signal propagation bacterium amplifies the signal molecule by producing additional signal molecules in response to the presence of the signal molecule
Implementation Method 3
the display bacterium produces an observable signal in response to presence of the signal molecule
Implementation Method 4
allowing the sensor bacterium and the signal propagation bacterium to migrate into subsurface soil below the soil surface
Data Source
AI summary
Methods of detecting a target analyte in subsurface soil can providing a bacterial consortium embodying a genetic circuit. Such a consortium can include a sensor bacterium, a signal propagation bacterium, and a display bacterium, which are provided at a soil surface. The sensor bacterium and signal propagation can be allowed to migrate into subsurface soil below the soil surface. The sensor bacterium can be exposed to the target analyte in the subsurface soil. The sensor bacterium can produce a signal molecule in response to the presence of the target analyte. The signal propagation bacterium can amplify the signal molecule by producing additional signal molecules in response to the presence of the signal molecule. The display bacterium can produce an observable signal in response to presence of the signal molecule.