Dictionary » R » Rubidium



(Science: chemistry, element) A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties.

Origin: NL, fr. L. Rubidus red, fr. Rubere to be red. So called from two dark red spectroscopic lines by means of which it was discovered in the lepidolite from Rozena, Moravia.

Abbreviation: Rb

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Making Competent Cell

Hi, Anyone here have a good protocol in making chemical treated competent cells fast? Currently using rubidium chloride method.

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by kenpier
Tue Sep 06, 2011 10:11 am
Forum: Microbiology
Topic: Making Competent Cell
Replies: 5
Views: 4201

Ionic bonds

... you're looking for the dielectric constant and it's effect on ionic bonds. However, I'd like to add, that bond is 100% ionic, even the bond in rubidium fluoride is partly covalent.

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by JackBean
Sun Aug 07, 2011 8:05 am
Forum: General Discussion
Topic: Ionic bonds
Replies: 2
Views: 6000

Re: Competent cells- just won't work!

... water with a pH meter and the fact it's 18 ohm should be sufficient proof that the pH is 7? At least when it comes out of the machine. I've tried rubidium chloride and calcium chloride both unsuccessfully. ARGH!

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by weenold
Thu Sep 02, 2010 8:34 am
Forum: Molecular Biology
Topic: Competent cells- just won't work!
Replies: 14
Views: 12757

Competent cells- just won't work!

... the problem here. Since one of your starins did work, it seems that the method is fine. I would suspect your cells. HAve you tried another method (Rubidium chloride is supposed to make chemically competent cells almost as good as electrocompetent one, and with much less work)

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by canalon
Wed Aug 25, 2010 5:35 pm
Forum: Molecular Biology
Topic: Competent cells- just won't work!
Replies: 14
Views: 12757

Natural selection is proven wrong

... be indicated as having once been a different element, and thus how much of those there are can tell what the original amounts were. I'll use the rubidium-strontium dating method as an example. The natural form of strontium is Sr86, but Rb87 decays to produce Sr87, and Sr87 is only produced as ...

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by alextemplet
Sat May 09, 2009 6:08 pm
Forum: Evolution
Topic: Natural selection is proven wrong
Replies: 247
Views: 688991
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