Chemotaxis refers to a bacteria changing its direction of movement based on a chemical compound.

University of Wisconsin - Madison

There are many environmental signals bacteria sense that influence their movement in the form of a taxis. These taxes are: 
- Phototaxis
- Magnetotaxis
- Chemotaxis

Taxis Influencing Bacterial Movement 

https://openstax.org/details/books/microbiology/

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

Magnetotaxis is when a bacteria senses magnetic fields and changes its movement. 

Magnetotaxis

Chemotaxis

Phototaxis is the directional movement of a bacterium in response to light stimulation.

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