HPLC: how to calculate violaxanthin area if it overalps with neoxanthin?

Does anybody know of, or have a method suitable for HPLC analysis that allows to separate violaxanthin from neoxanthin? I want to quantify the xanthophyll cycle (violaxanthin, antheraxanthin and...

21 January 2021 5,775 5 View

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07 December 2020 6,382 2 View

How does the His-Link Protein Purification Resin (Promega) perform?

We have always used Probond (Invitrogen) but Promega resin is cheaper. I was wondering how the Promega resin performs, to see if it is worth to change brands. Thank you!!

18 October 2020 4,351 3 View

How should I approach a Multilevel (2-1-1) Mediation Model with Categorical IV in SPSS or R?

Hi, In my study I have to test a mediation hypothesis in a multilevel (2-1-1) non-longitudinal model, with a categorical IV. I have access to R and SPSS, eventually to MPlus as well. As I...

30 January 2020 2,111 2 View

How do Lexico-semantics features of Nigerian English affect secondary school students spoken English?

What are lexico semantics features of Nigerian English and how do they affect the spoken English of secondary school students?

28 January 2020 9,712 2 View

Can anyone help me with the detection of amyloid beta by western blot?

Can anyone help me with a working protocol for amyloid beta detection by western blot? I have extracted the whole proteins from the cells. For the Western blot I used a Precast gel 4-20% (in SDS...

25 November 2019 3,217 4 View

How to open pictures taken by using InCell2200 (file xdce) in ImageJ?

Hi everybody, I have problems in opening a .xdce file. The file is supposed to contain several series of images taken with the microscope InCell 2200. I tried to open the file by using either...

03 September 2019 4,096 2 View

Does the CellROX dye detect intracellular H2o2 or ROS in general?

Hi, I am looking for a dye to detect H2o2 in living cells that is not fluorecent in green because my cells are already GFP positives. Does anyone have any suggestion? I found the CellRox dye but I...

04 October 2018 4,770 3 View

How can i properly select the solvent to perform an extraction or to prepare a column?

I would like to attach a carbon triple bond to a benzaldehyde ring and to do that i am trying to perform a williamson reaction: https://en.wikipedia.org/wiki/Williamson_ether_synthesis. The two OH...

11 September 2018 4,206 3 View

Gene sequencing to check a SNP?

Hello, I have two cells lines: A375 and Mel-ST. This last one is an immortalized cell line from primary melanocytes. The BRAF gene should be mutated with V600E mutation in A375 cells but not in...

21 June 2018 8,561 6 View

How can I measure MMP-1 protein activity or protein level from liver tissue?

Instead of checking only the mRNA level, I want to check the active protein level of MMP-1 in Liver tissue from mice. How can I do that?

03 March 2021 1,763 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

Does any one know how i can prepare liver tissue with transmission electron microscope with good fixation?

i have problem in preparation of liver tissue with bad cell organelles and how i can adjust osmolarity

03 March 2021 8,890 1 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

What are some important techniques for protein induction and SDS-PAGE analysis?

Hello everyone. I am fairly new in protein chemistry field. I am trying to perform a protein induction hoping to purify my protein of interest using FPLC method. However, I am having trouble on...

03 March 2021 8,237 3 View

SDS page software for analysis?

I did sds page to determine the difference in protein expression between 3 types of vaccine , but i don't have scanner or densitometer available. . so i wonder if there is a software to analyze...

02 March 2021 6,270 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

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

What do I do with DLS peaks that are from the buffer?

I'm looking at the aggregation of my protein sample using DLS. Unfortunately, my buffer (20mM HEPES) also results in a set of peaks. These are at approximately 1 and 1000 d.nm. The lowest peak...

01 March 2021 9,015 2 View