Microbiology

PMIXI Featured

Which prokaryotes can perform photosynthesis?

Cyanobacteria (blue-green algae, blue-greens) are prokaryotic organisms that contain a photosynthetic apparatus similar in structure and function to that present in the chloroplast of the phototrophic eukaryotes (Stanier, 1977). How is photosynthesis different in prokaryotes and eukaryotes? (a) Photosynthesis in eukaryotes takes place in chloroplasts, which contain thylakoids stacked into grana. … Photosynthetic membranes in …

Which prokaryotes can perform photosynthesis? Read More »

How did Dr Barry Marshall prove that bacteria Helicobacter pylori causes ulcers?

They discovered that peptic ulcers were due to Helicobacter pylori, not stress as previously thought. In 1984 Marshall did the ultimate test by infecting himself with the bacteria, developing the symptoms of the disease and then successfully treating himself with antibiotics. Why did Barry Marshall get a Nobel Prize? The Nobel Prize in Physiology or …

How did Dr Barry Marshall prove that bacteria Helicobacter pylori causes ulcers? Read More »

Is Lactobacillales the same as Lactobacillus?

The genus Lactobacillus belongs to the phylum Firmicutes, class Bacilli, order II Lactobacillales, and family Lactobacillaceae. Lactobacilli are Gram-positive, catalase-negative, non-spore-forming, rod-shaped bacteria that produce lactic acid as the major end product of fermentation. What are Lactobacillales? Lactobacillus species are probiotics (“good” bacteria) normally found in human digestive and urinary tracts. They can be consumed …

Is Lactobacillales the same as Lactobacillus? Read More »

Are Hippeas healthy?

Hippeas are healthier than most “puff” snacks, with around half the sodium, 3x the fiber, and 2x the protein of Cheetos Puffs. However, they are still salty snacks made of processed flour and oil. In fact, they have more sugar than Cheetos. They’re much less healthy than whole foods. Did Costco stop selling Hippeas? After …

Are Hippeas healthy? Read More »

Is Nitrosomonas autotrophic?

Nitrosomonas and Nitrobacter are chemosynthetic autotrophs. Trypanosoma is a parasitic organism. Where can I get Nitrosomonas? This gram negative chemolithotroph oxidizes ammonia to nitrite and lives in several places such as soil, sewage, freshwater, the walls of buildings and on the surface of monuments especially in polluted areas where air contains high levels of nitrogen …

Is Nitrosomonas autotrophic? Read More »

What does Streptococcus thermophilus do in yogurt?

thermophilus has been used to make yogurt. Its purpose is to turn lactose, the sugar in milk, into lactic acid. The increase in lactic acid turns milk into the gel-like structure characteristic of yogurt. What are the characteristics of Streptococcus thermophilus? Characteristics. Streptococcus thermophilus is a Gram-positive spherical to ovoid nonmotile coccus, 0.7–0.9 μm in …

What does Streptococcus thermophilus do in yogurt? Read More »

Scroll to Top