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Does E. faecalis test positive for MSA agar test?
E. faecalis typically does not ferment mannitol, so it does not grow well on mannitol salt agar (MSA) and would not test positive on this medium. MSA is selective for organisms that can ferment mannitol, such as Staphylococcus species.
What reaction does the enzyme involved in Mannitol-salt agar test mediate?
Mannitol salt agar is selective for gram positive bacteria, and differential for mannitol fermenters. Phenol red is the indicator containing the enzyme mannitol.
What does a positive Molisch's test on an unknown substance indicate?
A positive Molisch's test result indicates the presence of carbohydrates.
What color changes indicate a positive result for dische diphenylamine?
A positive result for dische diphenylamine test would be indicated by a deep blue color change in the solution. This color change indicates the presence of DNA, as dische diphenylamine reacts with deoxyribose sugars in DNA to produce a blue color.
What types of food would test positive result for carbohydrates proteins fats?
Any food that has carbohydrate, protein, and fats can be shown positive for those food test. It is basically a chemical reaction that indicate the presence of food component by a specific color formation.
Does E. faecalis test positive for MSA agar test?
E. faecalis typically does not ferment mannitol, so it does not grow well on mannitol salt agar (MSA) and would not test positive on this medium. MSA is selective for organisms that can ferment mannitol, such as Staphylococcus species.
What reaction does the enzyme involved in Mannitol-salt agar test mediate?
Mannitol salt agar is selective for gram positive bacteria, and differential for mannitol fermenters. Phenol red is the indicator containing the enzyme mannitol.
What is positive color for iodine test?
The positive color for the iodine test is a dark blue or black color. This color change indicates the presence of starch in the test substance.
What does a positive Molisch's test on an unknown substance indicate?
A positive Molisch's test result indicates the presence of carbohydrates.
What color is positive test result for glucose?
the color of a positive test results is bright green
What color changes indicate a positive result for dische diphenylamine?
A positive result for dische diphenylamine test would be indicated by a deep blue color change in the solution. This color change indicates the presence of DNA, as dische diphenylamine reacts with deoxyribose sugars in DNA to produce a blue color.
Lactose fermentation mac conkey test which color indicate a positive test?
MacConkey agar is yellow (due to the lactose in the agar). When an organism consumes the lactose, the agar turns purple. Purple indicates a positive test. If the organism doesn't use the agar, the agar stays yellow.
What types of food would test positive result for carbohydrates proteins fats?
Any food that has carbohydrate, protein, and fats can be shown positive for those food test. It is basically a chemical reaction that indicate the presence of food component by a specific color formation.
What color is a positive test for protein?
A positive test for protein typically appears as a violet or purple color when using chemical indicators such as Biuret reagent. This color change indicates the presence of proteins in the test sample.
Does S epidermidis test positive for MSA agar test?
Yes. S. epidermidis is a bacterial species found commonly on the skin as a part of a human's natural bioflora. Sweating releases salt and causes the surface of our skin to be very salty, providing an environment in which many bacteria would normally perish. S. epidermidis, however, prefers such an environment and thus it is also able to grow regularly when cultured on Mannitol Salt Agar plates.
What does a positive presence-absence test indicate?
The Presence-Absence (P-A) test is a presumptive detection for coliforms.
What is mannitol salt test for and whats a positive test result?
Mannitol Salts agar is a selective and differential media used to identify Staphylococcus sp. The media is selective due to the high salt concentration which prevents all but halophiles from growing. The media is differential due to the presence of mannitol and the indicator Phenol Red. Staphylococcus aureus can ferment mannitol and produce lactic acid as a result. The media contains an indicator called Phenol Red which turns yellow in low pH environments. This results in a yellow halo around the S.aureus colonies. Staphylococcus epidermidis cannot ferment mannitol and so the colour of the media around these colonies does not change. Certain vibro species and other halophiles may grow on these plates some of these appear pink and some may be able to ferment mannitol leading to false positives. S.epidermidis is a normal commensal organism and grows on the skin. S.aureus is a potential pathogen, antibiotic strains exist and can be hospital accquired infections. Search for "MRSA" for more information.
