Nematode Taxis Analysis with Asymmetric Container Reference Points
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Solution Overview
Problem
Existing methods for analyzing nematode taxis in containers with point-symmetrical or line-symmetrical shapes fail to accurately determine attraction and avoidance regions due to rotation, making it impossible to specify the urine sample location and assess nematode behavior correctly.
Innovation Solution
A taxis analysis method that utilizes a reference point in the container or culture medium to determine attraction and avoidance regions, allowing accurate analysis regardless of rotation angle, and includes features like container identification and image processing to manage results accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a container with point-symmetrical or line-symmetrical shape is used for nematode imaging, then the container can be easily manufactured and handled, but it becomes impossible to specify the urine sample location and determine nematode attraction behavior when the container rotates during movement
Solution Approach 1:
The patent introduces an asymmetric reference point (such as a mark, pattern, or irregular feature) on the bottom surface of the container. This asymmetric feature breaks the rotational symmetry of the container, enabling the imaging system to identify the reference point's position and thereby determine the location of the urine sample and the attraction/avoidance regions regardless of the container's rotation angle. The asymmetric reference point serves as a unique orientation marker that resolves the ambiguity caused by rotational symmetry.
2Loss of time
If the container is moved to below an imaging device after a predetermined time, then the nematode distribution can be captured, but the container rotation during movement causes loss of spatial reference information
Solution Approach 1:
The patent applies preliminary action by placing the asymmetric reference point on the container bottom surface before the nematode distribution experiment begins. This reference point remains stationary relative to the container throughout the experiment, including during the movement to the imaging device. When the image is captured, the reference point's position provides the spatial reference needed to reconstruct the orientation and locate the urine sample, thereby preventing loss of spatial reference information during the necessary time delay for nematode movement.
3Productivity
If automation is implemented to process a large number of urine samples, then processing efficiency increases, but the complexity of the system increases
Solution Approach 1:
The patent implements self-service by designing the container with an inherent asymmetric reference point that automatically provides orientation information during imaging. The imaging system simply needs to detect the reference point's position in the captured image to determine the container's orientation and locate the urine sample. This eliminates the need for complex external positioning systems, sensors, or mechanical orientation control mechanisms, thereby achieving automation with minimal increase in system complexity.
Data Source
AI summary
A taxis analysis method for performing taxis analysis of nematodes using a container in which a reference point is provided in the container or a culture medium in the container, the taxis analysis method including steps of: imaging a distribution mode of the nematodes in the container after the nematodes and a specimen of a subject are dropped into the container; detecting a position of an object of the reference point corresponding to the reference point included in the image obtained by imaging; determining an attraction region and a avoidance region on the basis of the position; and executing taxis analysis using objects of the nematodes in the determined attraction region and avoidance region.