Effects of Light on Bacterial Growth
Light can have different effects on bacterial growth:
- High-intensity visible light: It kills bacteria. The excessive light and the presence of oxygen, can cause oxidative stress on bacterial cells as it generate reactive oxygen species.
- Low-power visible and near infrared light: It enhances the growth rate of the bacteria.
- Daylight and fluorescent light: It inhibits the growth rate of bacteria.
- Ultraviolet (UV) wavelengths: It inactivates many microorganisms as it damage bacterial DNA and therefore finds application in sterilization.
Some bacteria that live in freshwater environments grow faster during the day, even though they don’t use sunlight as an energy source. For example: phototrophic bacteria: bacteria, like cyanobacteria, can utilize light for photosynthesis and energy production.
Bacterial Growth Curve – Phases, & its Factors
Bacterial Growth curve is a graphical representation of the changes in the number of bacteria in a population over time. The curve is divided into four phases: the lag phase, the exponential (log) phase, the stationary phase, and the death phase. These phases describe the population dynamics of bacteria as they grow in a closed system like a culture medium. In this article, we will learn about the bacterial growth curve, its phases, application, and importance.
Table of Content
- Bacterial Growth Curve Definition
- Bacterial Growth
- Growth Curve
- Bacterial Growth Curve Diagram
- Phases of the Bacterial Growth Curve
- Factors Affecting the Bacterial Growth Curve
- Growth and Oxygen in Bacteria
- Effects of Light on Bacterial Growth
- Application of Bacterial Growth Curve
- Importance of the Bacterial Growth Curve
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