During sexual reproduction in centric diatoms, the male gametes possess flagella that enable directed movement to seek and fertilize female gametes.

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Diatoms, also known as Bacillariophyta, are unicellular stramenopiles characterized by having outer cell walls of crystallized silica called frustules. They are capable of reproducing both sexually and asexually.

Diatoms

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

Diatomaceous earth is a substance composed of the fossilized remains of diatom silica cell walls (frustules), which is used commercially for applications such as insulation and filtration.

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