Posted: Thu Mar 16, 2006 10:05 am
I didn't read it as being from the perspective of the antibiotic. Where do we see that?BGoodForGoodSake wrote:This statement is misleading, your second source cleary shows this is not the case. Loss of information here is from the perspective of the antibiotic, but why take this perspective?
I'm not a biologist or a doctor, but I would surmise the transport mechanism is there as a function of the bacteria in general and drugs that are created by man try to exploit this in order to kill the bacteria. Sort of like throwing a grenade on a conveyor belt to take it to the next room where you know the enemy is.But even without the second source why call it a defect to a trasport mechanism? Does the mechanism exist to transport a substance which is lethal to the bacteria? How can this be so?
Yes, the site I linked to was discussing bacteria in general. Not excluding staff.However were we not specifically talking about MRSA bacteria?
If you read further down the page it states:In this case resistance is due to a change in the protein which the antibiotic binds to. This isn't a loss of information. It's like changing the locks on your front door.
To further this, I looked into the mutation (loss of information) of the MRSA bacteria:Exposure to antibiotics doesn't cause bacteria to become drug resistant. The above changes in the bacterium that enable it to resist the antibiotic occur naturally as a result of mutation (def) or as a result of genetic recombination (def). Exposure to the antibiotic selects for strains of the organism that have become resistant through these natural processes.
linkA nucleotide substitution at position 202 (M3) in mecI was detected in three strains (SH15, SH19651, and SH212) which had exhibited mecI RFLP pattern 2. Other base substitutions, M1 in strain SH20 and M2 in strain SH22, generated an amino acid change and a new termination codon, respectively. [he deletion of 28 bases (M5) near the 5' end of the mecI gene was found in MRSA strain SH13, which had shown mecI RFLP pattern 3. This base deletion, shown in Fig. 2A, caused a premature termination at position 33 on the mecI gene.
I think I allah akbared this thread, sorry