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Why does an antibiotic not work the same for all bacteria?
Bacteria also do evolve. If one bacteria is mutated, and survives an attack by antibiotic, he multiplies and forms more bacteria which are more resistant against antibiotic. As days of surviving antibiotics and multiplying eventually creates a bacteria which is resistant against it.
Why water is not used in normal phase hplc analysis?
In normal-phase chromatography, the stationary phase is polar and the mobile phase is a mixture of non-polar solvents such as hexane and slightly more polar solvents such as isopropanol. water is the most polar solvent of all solvents. If you use water as a mobile phase, the polar analytes will remain dissolved in water and there will be no retention of analytes on the stationary phase. If there is no retention on stationary phase, there is no separation
Why water is not used in normal phase analysis?
In normal-phase chromatography, the stationary phase is polar and the mobile phase is a mixture of non-polar solvents such as hexane and slightly more polar solvents such as isopropanol. water is the most polar solvent of all solvents. If you use water as a mobile phase, the polar analytes will remain dissolved in water and there will be no retention of analytes on the stationary phase. If there is no retention on stationary phase, there is no separation
Gram negative bacteria tend to be more?
resistant to being killed.
Why does not finishing an antibiotic contribute to antibiotic resistance?
When you take antibiotics, you start killing the bacteria in your body. The first ones to die are the ones that are mostly easily killed by the drug. Bacteria are very variable, however, so some of the bacteria in your body will be more able to resist the drug. For example, they might have an enzyme that gives them some protection from the drug. If you take all of your prescription, you might eventually overwhelm even these slightly resistant bacteria, killing them. If you stop taking your antibiotics early, however, the more resistant bacteria may survive. When they reproduce, they pass their resistance along to their offspring. As bacteria reproduce, more changes occur in their DNA so slightly resistant bacteria can become even more resistant. So, not finishing your antibiotic increases the chances of letting resistant bacteria survive to reproduce and make resistant offspring, that may become even more resistant with time.
Paper chromatography with screened methyl orange?
The two components are a yellow dye ( more sluble in stationary phase) and a blue dye (more slouble in mobile phase)
How can antibiotics give rise to resistant strains of bacteria?
The theory is that any time you use an antibacterial agent, you can only kill 99.99% of the bacteria, while the remaining 0.01% may be bacteria more resistant than the original. When those few remaining bacteria multiply, they may be more difficult to destroy.
What is the difference between reverse phase and normal phase chromatography?
Normal Phase: It has a polar stationary phase and a non-polar mobile phase.Reverse Phase: It has a non-polar stationary phase and a moderately polar mobile phase
What is the significance of TLC over paper chromatography?
Paper chromatography and TLC both use a solid stationary phase and liquid mobile phase. The only real difference is in the physical and chemical composition of the stationary phase. Paper chromatography uses a fibrous protein/polymer mesh (i.e. paper) as its stationary phase, TLC uses a compacted powder (usually silica or alumina) on a sealed backing.
What is mercy's disease?
MRSA is Methicillin-resistant staphylococcus aureus. It is a type of staph bacteria) resistant to the antibiotic Methecillin. For more information on MRSA please visit Answers.com.
What bacteria is called superbug infection?
diptheria There are an extremely large amount of diseases caused by bacteria, but fortunately bacterial diseases are easily cured with antibiotics, whereas viral diseases cannot be cured (only the symptoms can be treated) and must run there coarse.
Which B Megaterium culture logarithmic or stationary phase would show the best survival following exposure to UV radiation?
A B. megaterium culture in stationary phase will contain more endospores as nutrients become limited and therefore would demonstrate the best survival following exposure to UV radiation.
