Can anyone please tell about slope function

Joshua Silverstein via (by silverstein.joshua from
Thu Mar 24 14:54:59 EST 2011

I feel his/her pain in hearing "you should check this source and that, this
is simple"... I do agree this subject is a bit ridiculous to ask, but I have
posed questions to the listserve before about protocols that seem to be so
common that a real detailed SOP isn't available unless your lab has been
working on the problem for a decade or three.  With more information in the
digital age, it seems like we just have a lot more junk out there to sift

I wish that people would be more respectful and just help.  We don't know
each other and I'd like to think of the listserve as a symbiotic
relationship where we can all learn without being told we are stupid.
Really it would take 2 minutes of your time and care to help one another
out, instead of ridiculing. This listserve doesn't exist to question the
state of science today, it is to advance it. If you want to talk policy,
find another venue, or I bet less people will subscribe to this listserve.
In that case, we all lose.


On Wed, Mar 23, 2011 at 11:56 AM, WS <novalidaddress from> wrote:

> Dear Jay,
> I think you got me a bit wrong. This was not an attempt to subverse
> the presentation of measured data by using "politically incorrect"
> methods.
> As those colorimetric assays usually are not supposed to be a thesis
> of itself, one usually is interested in quick and accurate results
> (actually, protein determinations are quite annoying to me).
> Spreadsheets like excel provide some quick and easy means to reach
> that goal and it's easy to set up forms where you just enter your data
> and you get the results you need for your actual experiment.
> Drawing a regression curve allows to display the corresponding
> function. Regardless if you want linear or polynomic regression, if
> you plot the diagram in the canonical way (y-axis: OD, x-axis:
> concentration), you will have to do additional mathematics to obtain
> an equation that allows you to calculate concentrations from ODs. When
> you do it as I suggested (x: OD, y: conc), excel will give you
> directly an equation you may use immediately for downstream
> calculations (just copy the coefficients into the spreadsheet). You
> simply don't need to calculate the inverse function by yourself which
> costs time and may introduce errors in such a routine task (and might
> become quite difficult if the regression is not linear). Of course,
> one should understand what one is doing and not just enter some
> figures into a spreadsheet you snatched from your (colleague who
> snatched it from his)^n. Or your PI told you to enter the data into
> that form and you actually have no idea what's happening.
> I also would not blame Sudheer for asking his question. It shows there
> might be some profound deficits in the concurrent education of
> students and young scientists. Probably the focus gets more and more
> on reproducing knowledge and being fast (in order to get good
> gradations, scholarships, grants, good jobs, etc etc) instead of
> understanding what really happens and being able to dissect and
> analyze problems and to get your feet on the ground in unknown
> terrain.
> Wo
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