Can you help me with pharmacopoeia procedure 3.2.1 on arsenic determination?

Hi to all I am writing you in order to get more information about the procedure 3.2.1 on Arsenic determination in glass containers for pharmaceutical use. In the monograph, at the paragraph...

05 June 2018 1,229 3 View

How do you overcome the following issues with S and Os ICP-OES?

hi to all, i'm experiencing several issues with detection of elements such as sulfur and osmium at icp-oes. in particular, i work with an Agilent ICP, and at each analysis, i have to analyse these...

08 September 2017 5,321 3 View

Is it possible to infere from isoelectric point the superficial pH?

hi to all, i would like to estimate the superficial pH on spherical particles having dimension of nanometers. since the surface is regular and omogeneusly coated, i was wandering if could i infere...

02 March 2016 8,923 2 View

No title

02 March 2016 8,187 4 View

How can I stop protein induction?

hi to all, i was wandering if it is enough to pellet cells (e.coli) from the protein induction medium containing iptg and resuspend them in a new medium without inductor to stop the protein...

01 February 2016 3,521 3 View

Is it possible to co-trasform E.Coli bl21 de3 gold with two iptg inducible plasmids?

hi to all, i was wandering if it is possible to transform bl21 de3 cells with two plasmids. the aim is to espress 2 proteins at once. the two plasmids are both iptg inducible, and ampicillin...

01 February 2016 2,988 8 View

Is it strictly necessary the chloramphenicol in LB agar plates for pLysS cells, or the ampicillin is enough?

If I add chloramphenicol only in the overnight liquid culture, is ok? should the chloramphenicol be present also during the induction of the protein? thank you

31 December 2015 1,109 3 View

Could the OD_600 of a bacterial culture be a clue of protein expression?

hi to all, i have noticed that if i incubate two parallel bacterial cultures in the same conditions ( one where i add IPTG for protein induction and another in which I don't add anything) the OD...

31 December 2015 935 7 View

Can glucose polymers be used by E.Coli as carbon Source?

Hi to all, I'm wondering if glucose polymers such cyclodextrins, glycogen and more complex polymers, are metabolized by E.Coli. Thank you

09 October 2015 2,677 4 View

How can I dock a 4Fe-4S cluster into a protein?

hi to all, I'm trying to dock a 4Fe-4S cluster into a protein using the Haddock web-tool. I suppose that the protein I'm using coordinates the cluster by means of specific residues, that I have...

05 June 2015 5,853 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

Logistical regression using SPSS for a dichotomous dependent variable, with an independent variable of 1, 2, 5 and 10 seconds?

I have an experiment with 28 participants The independent variable is the times 1, 2, 5, and 10 used as the cross hairs during a task These 4 times were tested using 4 different blocks, each...

03 March 2021 9,692 2 View

Dapi fluorescence protocol for colon cell lines ?

28 February 2021 2,534 2 View

Will a 10xHis-tag prevent anti-MBP from binding to MBP?

I have a protein with a 10xHis-MBP tag on the N-terminus. I'm fairly certain I am expressing my protein, but I'm not getting a signal on my western blot. Is there a possibility that the 10xHis tag...

25 February 2021 8,404 3 View

What's the concentration recommend for recombinant protein use in western blotting?

I'm currently working having problem with the concentration for recombinant protein use in western blot, the one been used is Recombinant Human CD19 Fc Chimera Protein-rndsystem which does not...

24 February 2021 8,514 3 View

What is the best way to manage Western blots?

Increasingly, more articles are being retracted because of duplicate or otherwise dubious Western blots. Consequently, journals are asking for original Western blots and authentication of...

23 February 2021 8,609 3 View

Cloudy/high background western blot - can anyone help me?

Hi everyone! I try to detect VDR protein (~48 kDa) using Western Blot. After SDS-PAGE using 10% MP TGX Stain-Free Gel from BioRad I transferred the protein onto an metOH activated PVDF membrane...

23 February 2021 6,266 3 View

How to manage western blot for proteomics data validation?

Hi Everyone, I am a bigginer in western blotting and I am trying to use it for validation of my proteomics data. I have: two regulated proteins with molecular mass of 40 and 73 kDa one control...

23 February 2021 6,671 4 View