Cell walls help to prevent cells from bursting in dilute environments, but they do not have many functions available to help maintain structure in high osmotic pressure environments, which results in plasmolysis. 

How Cells React to Osmotic Pressure

Osmotic pressure is the pressure created across a membrane due to differences in solute concentrations.

- Temperature 
- pH
- Osmotic Pressure
- Barometric Pressure
- Light 
- Oxygen (environmental)

Physical Factors Influencing Microbial Growth

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

OpenStax Microbiology Textbook

pH is a scale of acidity based on the concentration of hydrogen ions. pH of 7 is considered neutral, below 7 is acidic, and above 7 is basic or alkaline. pH influences the structure of DNA via hydrogen bonds, lipid structure, and production of ATP due to hydrogen ion gradient.

Osmotic Pressure

Barometric pressure is also known as the Earth's atmospheric pressure. 

Barometric Pressure

Different organisms require various levels of oxygen for their metabolic processes, including some who are found in completely anaerobic ecosystems where no molecular oxygen is present. 

Environmental Oxygen Requirements for Microbial Growth

Some microbes require light for their metabolic processes and therefore to survive and grow.

Light as a Physical Requirement for Growth

The optimum growth temperature is where a population experiences its highest growth rates. The minimum growth temperature is the lowest temperature at which a population can grow and the maximum growth temperature is the highest. 

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