write a note on useful and harmful bacteria
Answers
Answer:
Helpful Bacteria
Lactobacillus/Döderlein's bacillus
Characteristics: Gram-positive, rod-shaped
Presence: Lactobacilli species are present in milk and dairy products, fermented foods and also form part of our oral, intestinal and vaginal microflora. L. acidophilus, L. reuteri, L. plantarum, etc., are some of the most predominant species.
Benefit: Lactobacilli are known for their ability to utilize lactose and produce lactic acid, as a metabolic byproduct. This ability to ferment lactose makes lactobacilli an important ingredient for preparing fermented foods. It is also an important part of the pickling process since lactic acid serves as a preservative. The formation of yogurt from milk is done through what is called, fermentation. Certain strains are even used commercially for the production of yogurt. In mammals, lactobacilli aid the breakdown of lactose during digestion. The resulting acidic environment prevents the growth of other microbes in the body tissues. Being so, lactobacilli are an important part of probiotic formulations
Answer:
Useful bacteria are not harmful at all even they benefit us. Useful bacteria = lactobacillus bacteria, etc.
Harmful bacteria causes sneezing or cold, hay fever etc.