# Microbiology: Hello World A beginner-friendly multi-model lab that wires three simple modules into one story: a starter setup, a microbial growth simulator, and a plain-language reporter. **You pick a starting plate, watch viable cells grow until food runs out, and read why the colony declines after starvation begins.** ## What it simulates - A starting plate (initial cell count, available food, growth rate, space limit). - Viable-cell dynamics: cells eat, multiply, hit a carrying capacity, then decline once food is exhausted. - A "what happened" narrative that explains which limit dominated each phase of the run.  ## Run it on the Hub 1. Open the [Microbiology Hello World Growth Lab](https://hub.biosimulant.com/labs/4c7ac16f-3c6a-44e7-9608-6a8d359e6dab) on the public Hub. 2. Click **Run**. The bundled defaults run for 12 hours and produce viable-cell and food charts plus the setup and story tables. ## Inputs you can tune | Input | Meaning | |---|---| | `initial_cells` | How many cells are on the plate at the start. | | `available_food` | How much food is available. | | `growth_rate` | How fast cells multiply when food and space are available. | | `space_limit` | Approximate maximum colony size the space can hold. | ## What results to expect - **Viable cells**: a steep climb to a peak, then a decline once food hits zero. - **Food chart**: monotonic decline to zero as cells consume the substrate. - **Story reporter**: a plain-language explanation that names the dominant limit (food, space, or starvation). - **Next steps**: suggested parameter tweaks for follow-up runs.  **Info:** Source on GitHub: [models-microbiology-hello-world](https://github.com/Biosimulant/models-microbiology-hello-world). This is an educational lab, not a calibrated microbiology model.