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Is salmonella and shigella agar selective or differential?
Salmonella and Shigella agar (SS agar) is both selective and differential. It is selective because it inhibits the growth of most gram-positive bacteria and non-enteric gram-negative bacteria, allowing for the isolation of Salmonella and Shigella species. Additionally, it is differential as it contains indicators that differentiate between lactose fermenters and non-fermenters, with lactose fermenters producing pink colonies and Salmonella and Shigella typically forming colorless colonies.
Why cant you use the same selective and differential media for staphylococci and streptococci?
Staphylococci and Streptococci grow in different locations under different conditions. Staphylococci are found on skin surfaces and nasal path whereas Sptreptococci are found in the intestinal and urinary tract. Thus, due to difference in the growth conditions and biochemical processes, we need to use different selective and differential media for them.Binod,Toronto, Canada
Which is strong acid water or phenol?
A strong acid is typically stronger than phenol in terms of acidity due to its ability to fully dissociate in water to release protons. Phenol is a weak acid that only partially dissociates in water, making it less acidic compared to strong acids like hydrochloric acid or sulfuric acid.
What culture media can be used to test the carbohydrate fermentation?
To test carbohydrate fermentation, common culture media include phenol red broth and MacConkey agar. Phenol red broth contains a specific carbohydrate, and the color change indicates fermentation. MacConkey agar is selective for Gram-negative bacteria and differentiates lactose fermenters, which produce acid, leading to a color change in the medium. Both media are effective for assessing the fermentation capabilities of various microorganisms.
Is a blood agar selective or differential?
Blood agar is a bacterial growth medium which contains 5% sheep's blood. It is considered to be differential but not selective, because it is an enriched medium that provides a rich nutrient environment for many types of bacteria, while a selective medium supports the growth of certain types of bacteria but inhibits other types. Blood agar is considered differential because it is used to distinguish pathogenic bacteria based on the effect of bacterial enzymes known as hemolysins which lyse red blood cells. Blood agar is mainly used clinically to detect the presence of Streptococcus pyogenes, the human pathogen which causes "strep throat". Blood agar can be made selective by the addition of other ingredients.
Is Mannitol salt agar a selective or a differential medium?
Both
Why can mannitol salt agar and EMB agar be described as both selective and differential media?
it is selective because only a salt tolerant can grow. 7.5 nacl it has diffrential properties also. if mannitol formentors turns yellow staphlococus aureus; but if it has no change then its a nonpathogenic staphlococci (s. edermis)
How could the use of a medium which is both selective and differential be justified?
The use of a medium that is both selective and differential can be justified in a few ways. They allowe the growth of organisms that can be of interest. The media can also be quite useful diagnostically in medical settings.
Is TSA selective or differential media?
Selective media favor the growth of particular microorganisms. Bile salt or dye like basic fuschin and crystal violet favor the growth of gram-negative bacteria by inhibiting the growth of gram positive bacteria. Maconkey agar is widely used to grow E.coli and related bacteria. Differential media are media that distinguish among different groups of microbes and even permit tentative identification of microorganisms based on their biological characterstics. Blood agar is used to culture of bacteria from human throat. Mckoney agar is both differential and selective media.
Why cant you use the same selective and differential media for staphylococci and streptococci?
Staphylococci and Streptococci grow in different locations under different conditions. Staphylococci are found on skin surfaces and nasal path whereas Sptreptococci are found in the intestinal and urinary tract. Thus, due to difference in the growth conditions and biochemical processes, we need to use different selective and differential media for them.Binod,Toronto, Canada
How does selective breeding support Darwin's hypothesis about how evolution happens?
Selective breeding involves choosing specific traits to pass onto offspring, similar to how natural selection acts on variations in a population. Both processes involve the differential survival and reproduction of individuals with certain traits, leading to changes in a population over time. By artificially guiding the inheritance of desirable traits in selective breeding, it demonstrates how the natural environment can also act as a selective force in shaping evolution.
Is phenol soluble in toluene?
Cyclohexene and cyclohexane are both insoluble in water and bases. Cyclohexene is insoluble in weak acids and soluble in strong acids and is thus considered a neutral compound. Cyclohexane is insoluble in everything, and is considered an inert compound.
What can differential permeability also be described as?
Differential permeability can be described as phenomenon where a differential permeable membrane through different diffusion processes allows smaller molecules/ions as glucose, sodium and chlorine to diffuse out while macromolecules as starch to remain behind until an equilibrium is reached, where concentration of smaller molecules/ions equals on both sides of the differential membrane.Differential permeability can also be described as Dialysis.
What are the key differences between phenol and benzene in terms of their chemical properties and reactivity?
Phenol and benzene are both aromatic compounds, but phenol has a hydroxyl group (-OH) attached to the benzene ring, making it more reactive than benzene. Phenol can undergo reactions such as oxidation and substitution more readily than benzene. Additionally, phenol is more acidic than benzene due to the presence of the hydroxyl group.
Which is strong acid water or phenol?
A strong acid is typically stronger than phenol in terms of acidity due to its ability to fully dissociate in water to release protons. Phenol is a weak acid that only partially dissociates in water, making it less acidic compared to strong acids like hydrochloric acid or sulfuric acid.
Is a blood agar selective or differential?
Blood agar is a bacterial growth medium which contains 5% sheep's blood. It is considered to be differential but not selective, because it is an enriched medium that provides a rich nutrient environment for many types of bacteria, while a selective medium supports the growth of certain types of bacteria but inhibits other types. Blood agar is considered differential because it is used to distinguish pathogenic bacteria based on the effect of bacterial enzymes known as hemolysins which lyse red blood cells. Blood agar is mainly used clinically to detect the presence of Streptococcus pyogenes, the human pathogen which causes "strep throat". Blood agar can be made selective by the addition of other ingredients.
Which gram positive bacteria grows on macconkey and EMB?
Most gram positive bacteria do not grow on MacConkey agar or Eosin Methylene Blue (EMB) agar, as these are selective media designed to inhibit the growth of gram positive organisms. So, typically, you would not expect a gram positive bacteria to grow on these media.
