What does the appearance of pink or blue color in a thioglycollate tube mean?
The appearance of a pink or blue color in a thioglycolate tube means that oxygen is present in that part of the tube. The different colors depend on which dye has been added. Pink color comes from resazurine, and blue is from methylene blue.
What accounts for the color change of a thioglycollate tube?
acid production turns the entire tube yellow within a few hours. Because of the small amount of glucose in the medium (0.1%), the small amount of acid produced will rapidly be oxidized on the slant, resulting in a red color.
Which bacteria would grow at the bottom of a thioglycollate tube?
Obligate anaerobes will only grow in the lower areas of the tube. Microaerophiles will grow in a thin layer below the richly-oxygenated layer. Facultative or aerotolerant anaerobes can grow throughout the medium but will primarily grow in the middle of the tube, between the oxygen-rich and oxygen-free zones.
What does EMB agar test for?
EMB agar is used in water quality tests to distinguish coliforms and fecal coliforms that signal possible pathogenic microorganism contamination in water samples (presence of E. coli in the river/water sample indicates the possibility of fecal contamination of water so does the presence of other pathogenic enterics).
What color is streptococcus bacteria?
They display a white-greyish color and have a diameter of > 0.5 mm, and are surrounded by a zone of β-hemolysis that is often two to four times as large as the colony diameter. Microscopically, S. pyogenes appears as Gram-positive cocci, arranged in chains (Figure 1).
What grows on Cled Agar?
BD CLED Agar is suitable for the isolation and counting of many aerobically growing microorganisms, such as Enterobacteriaceae, Pseudomonas and other non-fermenting Gram negative rods, enterococci, staphylococci, Candida species, and many others from urine specimens.
How do I know if I have Streptococcus agalactiae?
GBS is characterized by the presence in the cell wall of the antigen group B of Lancefield classification (Lancefield grouping) that can be detected directly in intact bacteria using latex agglutination tests. The CAMP test is also another important test for identification of GBS.
How do you treat streptococcus bacteria?
Group A streptococcus bacteria can be treated with common, inexpensive antibiotics. Penicillin is the drug of choice for both mild and severe disease. For penicillin-allergic patients with mild illness, erythromycin can be used, although occasional resistance has been seen.
Is Ginger good for bacterial infections?
Ginger. The scientific community also recognizes ginger as a natural antibiotic. Several studies, including one published in 2017 , have demonstrated ginger’s ability to fight many strains of bacteria. Researchers are also exploring ginger’s power to combat seasickness and nausea and to lower blood sugar levels.