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Thanks for that consideration: for encryption to work right, I had to
turn off HTML in Thunderbird. It handles it well and places the URLs
in-line, but it's nice to have them collected neatly.
Will be reading through this work with interest! Thanks for sharing it!
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Nathan McCorkle
Rochester Institute of Technology
College of Science, Biotechnology/Bioinformatics
electrophoresis and PCR need such different Volt ranges...usually...
But some talk of using 100 Volts for electrophoresis in slow mode.
1 or 2 kV is more like it.
John
Electrophoresis in labs is generally less than 200V
Sent from my mobile Android device, please excuse any typographical errors.
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So, you could probably run electrophoresis at much lower voltages if you
were content with much shorter gels; for routine applications this
mightn't matter at all. If you just want to check the concentration
versus a known reference, or check the coarse size against a ladder, you
can get by with half the length gels are normally cast in.
The width of the gel, then, corresponds to current draw, so if you're
using 9V batteries (which have sweet F-all current to give), you're
better off with narrow gel rigs.
On 12/12/11 01:21, Nathan McCorkle wrote:
> Electrophoresis in labs is generally less than 200V
I think the problem with open gels at least, is that you need to keep
the gel hydrated, so you run lots of buffer on top of the gel as well.
I think the way to solve this problem is by using some sort of
capillary/closed-system to prevent dehydration. My genomics professor
said his capillary polymer (which is not agarose) can go for weeks of
sequencing before he needs to change it. Glass capillaries, straw
keikei gel, cut double-sided sticky tape sandwiched between glass or
plexiglass, maybe even cast silicone so its easy to clean and reuse.
At the end of any capillary/closed system, you need buffer reservoirs.
You start electrophoresing in your sample, then switch from the DNA
sample chamber at the end of the capillary/gel to the chamber with the
running buffer.
> And, of course, if your solution has less than 0.25 moles per liter of salt,
> then the resistance is even higher, and the current requirements are even
> lower.
>
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> On Mon, Dec 12, 2011 at 1:21 AM, Cathal Garvey <cathal...@gmail.com>
> wrote:
>>
>> The width of the gel, then, corresponds to current draw, so if you're
>> using 9V batteries (which have sweet F-all current to give), you're
>> better off with narrow gel rigs.
>
>
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Also, my enthusiasm for 9V batteries is considerably lower because they
are literally ten times as expensive in Ireland. For some unfathomable
reason, 9V batteries easily cost �5 each over here. :(
> .
> At 100 volts, that is about 3
> amperes<https://www.google.com/search?q=8.0645+ohms+centimeter+/+0.25+*+10+centimeters+%2F+10+square+centimeters>,
> which, as Cathal would be quick to
> point out, is probably a lot to expect from a dozen nine volts in parallel.
> But at a millimeter deep, it is only 300 milliamperes, which is easy to do
> with batteries. And if we then narrow it (as Cathal suggested) to 5 cm, we
> are only drawing 150 milliamperes, and life gets even simpler.
>
> And, of course, if your solution has less than 0.25 moles per liter of salt,
> then the resistance is even higher, and the current requirements are even
> lower.
>
>
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> On Mon, Dec 12, 2011 at 1:21 AM, Cathal Garvey <cathal...@gmail.com>wrote:
>
>> The width of the gel, then, corresponds to current draw, so if you're
>> using 9V batteries (which have sweet F-all current to give), you're
>> better off with narrow gel rigs.
>>
>