Week 3 HW: Lab Automation

Python Script for Opentrons Artwork

Here’s my HTGAA 2026 Opentrons Art Python Script Submission.

The artistic design I created using the GUI is available here.

I heavily used the “Example 7 Microbial Earth” by Dominika Wawrzyniak, using pixels loaded from an external resource (a CSV file hosted on my GitHub page).

I used Dominika’s well documented Notion page from HTGAA21 to understand the code and replicate it for my case. I used Gemini assistance only to debug minor typos and syntax errors, and to identify which packages to import to execute the code.

Like Dominika Wawrzyniak, I planned to introduce more colors, like in the image I generated in the Automation Art Interface. However, implementing this design into code turned out to be more difficult and tedious than anticipated, so I left it as one color (red).

Post-Lab Questions

Question 1

The paper “High-throughput experimentation for discovery of biodegradable polyesters” (Fransen et al., 2023) uses an Opentrons 1st-generation robot to automate a high-throughput biodegradation assay based on the clear-zone technique.

The researchers synthesized 642 polyesters and polycarbonates and tested their biodegradability using a clear-zone assay with Pseudomonas lemoignei. The Opentrons robot was repurposed as an automated imaging platform to capture time-lapse images of polymer degradation in 12-well plates, enabling consistent, large-scale monitoring over 13 days.

This automation allowed rapid generation of a large biodegradation dataset and supported machine learning models to predict polymer degradability from chemical structure.

Question 2

For my final project, I plan to use an Opentrons liquid-handling robot to automate a high-throughput microbial screening workflow for PHA producers. Isolates will be spotted in triplicate on 60-sector plates, maintaining the same indexed positions across all plates for direct comparison. I will first plate isolates on LB agar as a viability control, then inoculate mineral medium (MM; Ramsay et al., 1990) agar plates supplemented with single carbon sources (added as 10% v/v to reach typical final concentrations used in screening). PHA production and bacterial growth will be assessed qualitatively using a two-step staining workflow: (1) Sudan Black B staining (0.02% in 96% ethanol, followed by ethanol washes) to identify colonies that develop blue coloration, and (2) Nile Red A incorporated into MM (0.5 μg/mL) to rank selected isolates by UV fluorescence (312/365 nm). This setup allows rapid testing of many isolate × carbon source combinations, supporting selection of strains compatible with low-cost feedstocks and efficient bioprocessing.

Here’s my draft script for this exercise. Each “color” would correspond to a different bacterial isolate. I did not implement this in the script yet. The coordinate set is a starting layout and could be refined to achieve a more uniform, regular distribution across the plate.

Final Project Ideas

Added 3 slides with 3 ideas for an Individual Final Project in the appropriate slide deck for Commited Listeners here.