Lactobacillus acidophilus

Definition

Lactobacillus acidophilus is a gram-positive, rod-shaped bacterium that is a member of the Lactobacillaceae family. It is a lactic acid-producing bacterium commonly found in the human gastrointestinal tract and is considered a probiotic due to its beneficial effects on human health.

5 Must Know Facts For Your Next Test

1. Lactobacillus acidophilus is considered a probiotic because it can help maintain a healthy gut microbiome and improve digestive function.
2. As a lactic acid bacterium, Lactobacillus acidophilus ferments carbohydrates to produce lactic acid, which can inhibit the growth of harmful bacteria.
3. Lactobacillus acidophilus is an anaerobic bacterium, meaning it can grow and thrive in the absence of oxygen.
4. Lactobacillus acidophilus is commonly found in fermented dairy products, such as yogurt and kefir, as well as in dietary supplements.
5. Studies have shown that Lactobacillus acidophilus may help alleviate symptoms of lactose intolerance, diarrhea, and certain gastrointestinal disorders.

Review Questions

• Explain how the classification of Lactobacillus acidophilus as a lactic acid bacterium relates to its role in microbial types (1.3 Types of Microorganisms).
  • As a lactic acid bacterium, Lactobacillus acidophilus belongs to the group of microorganisms that produce lactic acid as the primary end product of carbohydrate fermentation. This classification places it within the broader category of bacteria, specifically the Lactobacillaceae family, which are important members of the human gut microbiome and play a crucial role in maintaining a healthy digestive system.
• Describe the significance of Lactobacillus acidophilus being an anaerobic bacterium in the context of oxygen requirements for microbial growth (9.2 Oxygen Requirements for Microbial Growth).
  • Lactobacillus acidophilus is an anaerobic bacterium, meaning it can grow and thrive in the absence of oxygen. This characteristic is important in the context of microbial growth requirements, as it allows Lactobacillus acidophilus to colonize and proliferate in the oxygen-limited environment of the human gastrointestinal tract. Its ability to survive and multiply under anaerobic conditions contributes to its success as a probiotic organism and its beneficial effects on gut health.
• Analyze how the probiotic properties of Lactobacillus acidophilus, such as its ability to inhibit harmful bacteria and improve digestive function, can impact the overall microbial community and human health.
  • $$Lactobacillus acidophilus's probiotic properties, including its production of lactic acid and its ability to inhibit the growth of harmful bacteria, can have a significant impact on the overall microbial community in the human gut. By maintaining a healthy balance of gut microbiota, Lactobacillus acidophilus can help prevent the overgrowth of pathogenic organisms, improve nutrient absorption, and support the proper functioning of the digestive system. This, in turn, can contribute to overall human health by boosting the immune system, reducing the risk of gastrointestinal disorders, and promoting a balanced gut-brain axis. The interplay between Lactobacillus acidophilus and the broader microbial ecosystem highlights its importance as a key player in maintaining a healthy microbiome and its potential therapeutic applications.$$

Related terms

Probiotics: Live microorganisms that, when administered in adequate amounts, confer a health benefit on the host.

Lactic Acid Bacteria: A group of bacteria that produce lactic acid as the major end product of carbohydrate fermentation.

Anaerobic Bacteria: Microorganisms that can survive and grow in the absence of oxygen.