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Dictionary » C » Coefficient

Coefficient

Coefficient

1. The expression of the amount or degree of any quality possessed by a substance, or of the degree of physical or chemical change normally occurring in that substance under stated conditions.

2. The ratio or factor that relates a quantity observed under one set of conditions to that observed under standard conditions, usually when all variables are either 1 or a simple power of 10.

Origin: L. Co-_ efficio (exfacio), to accomplish


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mutation-selection balance

... higher allele frequency for lethal recessive alleles). If the allele is not lethal in homozygotes, then q=√(μ/s), where s is again the selection coefficient for those who have a homozygous affected genotype. N.B. √ is square root in case it's not visible. What I don't get is why are the formulas ...

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by Monco
Mon Mar 04, 2013 10:41 pm
 
Forum: Genetics
Topic: mutation-selection balance
Replies: 0
Views: 68

Re: molar extinction coefficient

Well done -- I promise that the next time you face this sort of graphical calculation, it will make more sense. And as you've found, it's all about the units.

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by jonmoulton
Tue Dec 04, 2012 4:22 pm
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 1530

Re: molar extinction coefficient

Yes, that sounds too low, at least for those wavelengths where methyl red absorbs strongly. Did you correct your concentrations for the dilution you made as you mixed your stock solution into liquid prior to making the spectrometer measurement?

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by jonmoulton
Mon Dec 03, 2012 4:29 pm
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 1530

Re: molar extinction coefficient

... given the graph you see. By the way, using the above i got 0.01871m-1 cm-1 for methyl red....is this value not too small for the molar extinction coefficient though?

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by 2468
Sun Dec 02, 2012 2:38 am
 
Forum: General Discussion
Topic: molar extinction coefficient
Replies: 10
Views: 1530

pka

... can open *.spc files) http://www.colby.edu/chemistry/PChem/lab/pKaMethylRed.pdf (especially picture on p. 3 where you can see that the extinction coefficient is around 8000 M-1 cm-1) http://www-ec.njit.edu/~grow/Methylred.pdf

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by JackBean
Sat Dec 01, 2012 11:46 pm
 
Forum: General Discussion
Topic: pka
Replies: 6
Views: 1044
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