Interactive Biotechnology Simulation - Cell Processes, Fermentation, Genetic Engineering

From cell to bioreactor

Biotechnology combines biology, engineering, chemistry, and informatics to create products: drugs, enzymes, biomaterials, food components, energy. Cells and enzymes — biofactories designed for high productivity.

This module contains interactive calculations: culture growth, enzyme kinetics, PCR cycles, dilution factor, enzyme yield. A guide, FAQ, and examples will help deepen your understanding.

1. Logistics Culture Growth

Model dX/dt = μ X (1 - X / K)_max). Determines the number of cells over time t.

Initial concentration X₀ (g/l):

Maximum concentration X_max (g/L):

Specific speed μ (1/h):

Time t (hr):

2. Enzyme Kinetics (Michaelis-Menten)

Define reaction speed v = Vmax [S] / (K)_m + [S]).

Vmax (mmol/min·mg enzyme):

K_m (mM):

[S] (mM):

3. PCR cycles and DNA copies

Number of copies ≈ N₀ × (1 + efficiency)ⁿ.

Initial copies N₀:

Efficiency (0-1):

Number of cycles n:

4. Dilution Factor and Final Concentration

Calculate the final concentration after a series of dilutions.

Initial concentration (mg/ml):

Dilution factor (e.g., 10):

Number of steps:

5. Fermentation Exit (Y)_P/S)

Result = (Final product - Initial) / (Substrate consumed).

Initial product (g/L):

Final product (g/l):

Initial substrate (g/L):

Substrate final (g/l):

📚 Article: Sectors of biotechnology and key processes

Molecular Biotechnology

Genetic engineering, gene editing (CRISPR/Cas9), synthetic biology, cell lines CHO, HEK, bacterial systems (E. coli, Bacillus), yeast (Saccharomyces, Pichia).

Metabolic engineering

Bioreactors (batch, fed-batch, continuous), parameters: pH, DO, temperature, cell aggregation, respiratory limitation, foam blowdown, scale-up (k_La, mixing).

Downstream Processing

Cell lysis, filtration, centrifugation, chromatography (affinity, ion-exchange, hydrophobic), ultrafiltration, formulation.

Medical biotechnology

Bio-pharmaceutics (antibodies, vaccines, hormones), cellular therapy, CAR-T, gene therapy, diagnostics.

Industrial and green biotechnology

Biofuel (ethanol, biodiesel, SAF), bioplastics, enzymes for food industry, bioremediation, biosensors.

Bioinformatics

Genome, transcriptome, proteome, metabolome analysis, modeling metabolic pathways, digital twins of biological processes.

Quality control: GMP, GLP, GCP, process validation, PAT (Process Analytical Technology), QbD (Quality by Design).

Regulatory aspects

EMA, FDA, ICH, documentation, risk management, pharmacovigilance, bioethics, intellectual property.

Trends

Chip lab, microbiome therapy, automated pharmacies, AI for strain optimization, bio-circular systems.

❓ Frequently Asked Questions (FAQ)

1. What is fed-batch fermentation?

This is the process when nutrients are fed sequentially into the bioreactor to control growth and avoid inhibition/deficiency.

2. Why is CRISPR used?

CRISPR/Cas allows precise DNA editing, creation of knockouts, insertions, correction of mutations, development of therapies.

3. What does k mean?_La?

Gas-to-liquid transfer coefficient. Critical for oxygen supply in aerobic fermentations.

4. How is sterility controlled?

CIP/SIP, filtration, autoclaving, aseptic techniques, monitoring contamination, system integrity.

5. What does Y represent?_P/S and Y_X/S?

Y_P/S— product output to substrate, Y_X/S— biomass output to substrate. Important for process economics.

6. Why doesn't PCR give exact doubling?

Efficiency is rarely 100% due to limitations in reagents, inhibitors, temperature. That's why real coefficients are used.

7. What is downstream bottleneck?

When cleaning and processing the product cannot keep up with enzyme productivity, costs and losses increase.

8. How to evaluate strain productivity?

Parameters: growth rate, stress tolerance, product output, genome stability, nutritional requirements.

9. What are the biobiosafety risks?

Contaminations, pathogens, horizontal gene transfer, environmental impact. Required biosecurity levels (BSL), monitoring.

10. What are biochips?

MICROMATRIX PLATFORMS FOR ANALYZING THOUSANDS OF GENES/PROTEINS SIMULTANEOUSLY, USED IN DIAGNOSIS, RESEARCH.

📖 Examples Handbook

Example 1: Logistic growth

X₀=0.1, Xmax=10, μ=0.4, t=12 h → X(t) ≈ 4.5 g/l.

Example 2: Enzyme

Vmax=250, Km=0.8, [S]=5 → v ≈ 208 mmol/min·mg.

Example 3: PCR

N₀=1000, efficiency=0.9, n=30 → copies ≈ 1.3×10¹².

Example 4: Dilution

50 mg/ml, factor 10, 3 steps → 50 / 10³ = 0.05 mg/ml

Example 5: Exit

(45-0)/(80-20)=45/60=0.75 g product per g substrate.