Bacterial Endospore

Bacterial endospores are highly resistant, dormant structures produced by certain bacteria to survive environmental stress, making them important in biology, public health, and sterilization research. When nutrients become limited, the cell undergoes sporulation, enclosing a copy of its chromosome within a dehydrated core protected by calcium-dipicolinate, a peptidoglycan cortex, and protein coats; favorable conditions trigger germination and return to vegetative growth. Studying endospores helps researchers understand microbial survival, persistence, and disease transmission, particularly in species such as Bacillus and Clostridium. Endospore detection and resistance testing also guide disinfection practices, food safety controls, clinical diagnostics, and the design of sterilization methods.

Bacterial Endospore - Related Videos

Education

JoVE Science Education - Advanced Biology

Microscopy and Staining: Gram, Capsule, and Endospore Staining

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2023

Source: Rhiannon M. LeVeque1, Natalia Martin1, Andrew J. Van Alst1, and Victor J. DiRita1 1 Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America Bacteria are diverse microorganisms found nearly everywhere on Earth. Many properties help distinguish them from each other, including but not limited to Gram-staining type, shape and arrangement, production of capsule, and formation of spores. To observe these properties, one...

Research

JoVE Journal - Environment

Physical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells

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Cited by 17 •

2016

A method to single out bacterial endospores from complex microbial communities was developed to perform tailored culture or molecular studies of this group of bacteria.

Isolation of Endospores from an Environmental Sample by Targeted Lysis of Vegetative Cells

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2025

Source: Wunderlin, T., et al. Physical Isolation of Endospores from Environmental Samples by Targeted Lysis of Vegetative Cells. J. Vis. Exp. (2016)This video demonstrates a method to isolate endospores from an environmental sample containing both vegetative cells and various bacteria. The procedure involves filtration, mechanical disruption, and selective chemical treatment to weaken and lyse vegetative cells while preserving endospores. The final step isolates the resilient endospores through...

Endospores and Sporulation

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2025

Endospores are specialized, dormant cells primarily formed by Gram-positive bacteria, including Bacillus and Clostridium, enabling survival under extreme environmental conditions. Due to their unique composition and formation process, these structures are highly resistant to physical and chemical insults, such as extreme heat, ultraviolet and ionizing radiation, desiccation, and toxic chemicals. Rare instances of endospore-like structures have also been observed in some Gram-negative bacteria,...

Bacterial Transformation - Student Protocol

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2019

Bacterial Transformation ExpandIMPORTANT: In addition to wearing the appropriate personal protective equipment, be sure to take care to keep your face away from suspension cultures, and to avoid inhaling reagents. Do not touch your face while performing the experiment. Always wash your hands before and after every experiment. When you are ready to safely begin, check to make sure you have a tube or tubes of competent E. coli cells in your ice bucket. Then, transfer 50 µL from one of these tubes...

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