Broad host range vectors for protein expression in gram negative bacteria?

Hi, I am interested in recommendations of expression vectors for expression of proteins in E.coli and other Gram negative bacteria (potentially) that are independent of the T7 TNA polymerase; eg...

10 November 2018 3,779 0 View

PH-Stat or DO-Stat?

Any thoughts on what is the preferred method for glucose feed control in E.coli fed-batch? Both seem to have their merits, but quite difficult to tune pump PID settings to avoid sub-optimally...

31 December 2017 2,566 2 View

I am trying to find out where to ontain the E.coli strain JC8031

Can anyone tell me where i can source this strain? It is a tolRA knockout; hypervesiculating. I cannot find it in the normal collections and correspondence with two corresponding authors who have...

07 August 2017 8,734 1 View

We want to purchase an anti-HIS antibody for Western blotting. Any recommendations?

Looking for a good quality antibody to probe tagged proteins produce in E.coli. My last experience with several antibodies showed very different performance from different vendors.

10 November 2015 6,553 4 View

In antibody nomenclature, what is meant by IgG2.delta.a?

The antibody in question is "humanized" and described in a paper presenting clinical trial data

04 May 2015 5,423 0 View

Can anyone suggest references to assist in the clarification of crude tissue homogenates?

Can anyone point me to some useful references on methods to assist in clarification of crude homogenates of animal tissue? Centrifugation in our case is only partly successful and our current...

03 April 2014 1,883 1 View

Storage of Fab antibody fragments?

11 December 2013 2,950 2 View

Does anyone know where can I obtain a culture of Candida antarctica?

Any suggestions of culture collections or other sources where we could obtain this culture?

09 October 2013 2,285 2 View

Buffer to disrupt platelet alpha granules for PF4 quantification?

Hello! I want to quantify by ELISA the secreted (from platelets poor plasma) and the non-secreted (from platelet lysate) PF4 before and after TRAP stimulation. I will use the ELISA from R&D...

03 March 2021 1,499 2 View

Buffer Exchange using column packed with sephadex G-25 effect on protein concentration?

Hello, If i am doing a buffer exchange for an antibody of 1mg/mL, does the elution lose protein in the process of buffer exchange? For example, if i flow through 500 uL of 1mg/mL sample, and...

03 March 2021 6,299 3 View

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02 March 2021 3,060 3 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

Do you know any MR image dataset?

I would like to research on MR images (0.5T and 3T). Can you please suggest some websites that I can download dataset including both 0.5T and 3T MR images? Thank you.

02 March 2021 7,735 3 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

Issues with Permeabilization during Flow Cytometry?

Hello Everyone. Currently I am working to characterize macrophages in the myocardium after ischemia-reperfusion injury in rats. Due to the low total cell number isolated from rat hearts I can...

01 March 2021 3,867 3 View

Why are my bands weird in this Agarose gel?

Can someone please give me some possible things that could go wrong? Here is my recipe: 0.5g Agarose 50 mL of TAE 1x 1 uL ethyl bromide. Gel was run at 100V for 1 hour. The buffer used is also TAE.

01 March 2021 9,952 3 View

Which cell line should we use to perform biological dosimetry experiments?

We are preparing some experiments based on irradiating cells under different conditions in order to evaluate the effects in terms of DNA damage, genetic expression, etc. As our project is...

01 March 2021 3,355 3 View

Is it possible for two human neuronal cell lines to have different gene sequence for the same protein?

I am looking at the ATP1A2 (Sodium/Potassium ATPase alpha subunit 2) in two human neuronal cell lines. Expression levels of this protein seems to be almost equal when detected by one antibody....

01 March 2021 3,607 3 View