In response to Lazzaro Spallanzani's findings that sealed, heated broth remained clear of microbes, John Needham argued that life originates from a “life force.” According to Needham, this life force was destroyed during Spallanzani’s extended boiling. Any subsequent sealing of the flasks then prevented new life force from entering and causing spontaneous generation.

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Lazzaro Spallanzani ($${}1729$$–$${}1799$$) did not agree with John Needham’s conclusions and performed hundreds of carefully executed experiments using heated broth infused with plant and animal matter. His results contradicted Needham: broth in heated but sealed flasks remained clear, without any signs of spontaneous growth, unless the flasks were subsequently opened to the air. This suggested that microbes were introduced into these flasks from the air rather than arising spontaneously.

Lazzaro Spallanzani's Spontaneous Generation Experiment

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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.

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