user691: I have seen two of my comments, asking for further details on the question asked, removed.
The questions were these:
How do Proteins migrate in MES vs. MOPS
How do SDS-PAGE gels differ in a Bis-Tris system vs. a Tris-Glycine system?
Apparently, my comments were to the point since the author edited his questions accordingly. I was not advised that my comments had been removed, nor was I told why. I found out only by going back to the question, out of interest, to see if the inquirer had responded.
Who decides when and which comments are removed?

user6: I removed the comments because they were obsolete. The changes you asked for were made and those comments not necessary anymore.
Unrelated to my removal of those comments, I also think that it's not really necessary to elaborate on those very common buffer systems. Someone able to answer those questions is likely familiar with them, or has at least heard that those buffers exist.

user711: Comments are removed when they are obsolete or excessive noise.
Comments are meant to be ephemeral supplements to questions and answers on SE, mostly to ask for clarification. When a comment is no longer necessary it may be removed to reduce noise for future visitors.
The power of the Stack Exchange system is that noise is reduced to a minimum, future visitors to your questions/answers should be able to get in and out and get the information they want, too many comments can hinder that, so it's up to moderator's discretion when to remove comments. Consider removing your own comments after they have been addressed.

691: <p>I have seen two of my comments, asking for further details on the question asked, removed.</p>

<p>The questions were these:</p>

<p><a href="https://biology.stackexchange.com/q/1681/691">How do Proteins migrate in MES vs. MOPS</a></p>

<p><a href="https://biology.stackexchange.com/q/1680/691">How do SDS-PAGE gels differ in a Bis-Tris system vs. a Tris-Glycine system?</a></p>

<p>Apparently, my comments were <em>to the point</em> since the author edited his questions accordingly. I was not advised that my comments had been removed, nor was I told <em>why</em>. I found out only by going back to the question, out of interest, to see if the inquirer had responded.</p>

<p>Who decides when and which comments are removed?</p>
 6: <p>I removed the comments because they were obsolete. The changes you asked for were made and those comments not necessary anymore.</p>

<p>Unrelated to my removal of those comments, I also think that it's not really necessary to elaborate on those very common buffer systems. Someone able to answer those questions is likely familiar with them, or has at least heard that those buffers exist.</p>
 711: <p>Comments are removed when they are obsolete or excessive noise.</p>

<p>Comments are meant to be ephemeral supplements to questions and answers on SE, mostly to ask for clarification. When a comment is no longer necessary it may be removed to reduce noise for future visitors.</p>

<p>The power of the Stack Exchange system is that noise is reduced to a minimum, future visitors to your questions/answers should be able to get in and out and get the information they want, too many comments can hinder that, so it's up to moderator's discretion when to remove comments. Consider removing your own comments after they have been addressed.</p>
