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Akila Wijerathna Yapa

Member Since 12 Mar 2012
Offline Last Active Dec 26 2012 03:28 AM
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Topics I've Started

How to denote letters to mark significant differences in a bar chart plot

25 December 2012 - 04:02 AM

Need your help to find a solution for my problem to indicate significant differences in a bar chart plot. The data of the statistical test is available in the following format:

Bar1-bar2:significant

Bar1-bar3:not significant

I want to mark significant differences between two bars with different letters (like bar1:a and bar2: b. If there is no significant differences between two bars they get the same letter (like bar1:a and bar3:a). Sort the right letters to the bars gets much more complex when the number of bars increases. I have several hundreds of statistical comparisons here and have to find a computer program that can generate the letters from the data for me.

Anybody an idea which programme can help me?

I have added an example plot with letter-coded significant differences to illustrate what I want to do.

*** If any one can help me to obtain a good reference material that guide to Interpretation and analysis of biological research data would be much grateful.

Attached a sample e.g.

Guideline for Commercial scale of Plant Tissue culture production

24 November 2012 - 10:38 PM

Could you please help me to have a good idea on "Commercial scale of Plant Tissue culture production" or get reference materials regarding this topic, including;

+ Major aspects should consider
+ Media preparation guideline for large scale production
+Media Preparation for research scale level with different treatment and replication levels
+Budget planning

P.S: I've studied all the theories on plant tissue culture, I just want to know how to apply them for a commercial scale of production.

What happens to DNA in the presence of a chaotropic salt?

17 November 2012 - 04:38 AM

I've used 4M Guanidine Hydro Chloride (GuHCl) for Plant RNA Viroid extraction with 25mM EDTA, 0.2M Sodium Acetate (NaAc) (pH 5), 2.5% PVP 40. Could you please tell me ;

How RNA get separated from DNA when using GuHCl?

What is the purpose of adding NaAc in Nucleic Acid Extraction?

Directions of genes expression illustrations

12 November 2012 - 06:40 PM

Dear All;
I just Wanna Help from you for a bit confusing problem that I have, I though you all are the best persons to get answer.

Here's an example I'd use to ask my questions regarding how genes are expressed in a plasmid.

1.) Why in different plasmids their some genes expressing in different directions? how it happens?

2.) In the pBR322 below, I’ve noticed that there are two antibiotic resistance markers going in opposite directions. Also, the origin is going in the counter clockwise direction. Could you please let me know now I'm using tetracycline to select for my transformant, how'd the TetR gene be read since it’s on a collision course with the ori?

3.) why in same cassette different directions are shown?

4.) In plasmids (e.g. TDNA of Agrobacterium) some of genes marked with <-----> , >------> symbols { same symbols show in transposons too ( <------> )}
Could you please tell me wht tells from these arrow heads?


I've attached some of related figures that I've seen and shown numbers according to questions.Attached File  1.), 2.) Q.jpeg   11.4K   71 downloadsAttached File  3.)Binary vectors used for plant transformation..jpg   35.66K   64 downloadsAttached File  4.).gif   14.52K   69 downloadsAttached File  4.).jpg   141.86K   63 downloads

different orientation or direction of genes in expression Plasmid vector

10 November 2012 - 06:19 PM

Dear all,

Wanna Help, Here's an example I'd use to ask my questions regarding how genes are expressed in a plasmid. In the pBR322 below, I’ve noticed that there are two antibiotic resistance markers going in opposite directions. Also, the origin is going in the counter clockwise direction. Could you please let me know now I'm using tetracycline to select for my transformant, how'd the TetR gene be read since it’s on a collision course with the ori?

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