How can I remove the protecting group of a thiol (trt) in a cysteine amino acid?

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Promotor observation in region annotation of RNA RIP-seq?

Hello all, I extracted RNA from my samples and performed RIP-seq. After annotating the genomic regions using R, I obtained promoters, exons, introns, and UTRs. Given that my samples consist of...

18 July 2024 1,579 2 View

Why do I get no melt curve peak and no Ct for some of my patients but not others, in a SYBR green qPCR?

I am doing a RT-qPCR for gene expression analysis of cancer patients, and there are four different groups in the results. The first group that shows over expression of my target gene (both two...

31 May 2024 1,088 0 View

Can anyone interpret why the absorbance in alpha amylase assay get increased with increased standard (inhibitor) concentration?

Can anyone interpret why the absorbance (DNS assay method) in alpha amylase assay get increased with increased standard (inhibitor) concentration? it should be decreased with increased standard or...

26 May 2024 4,753 2 View

Anyone with phosphate flotation experience?

I attempted a phosphate (apatite) flotation, but the slurry was too thick for the impeller to work properly. I reduced the solid content to 30% for better mixing, but the conditioning still seems...

14 May 2024 4,505 4 View

Why my amino acids do not contribute in amidation reaction?

Hello everyone, recently I am trying to synthesize a dipeptide with a Coumarin derivative of Tryptophan, and the problem is it doesn't contribute in reaction at all. Tryptophan itself in the same...

15 April 2024 6,778 3 View

How to increase concentration and quality of RNA after extraction?

Hello All, I'm doing RNA extraction from cells. I tried both ways by using TRIZOL (with chloroform, and isopropanol) and RNeasy mini kit. When I use TRIZOL, the RNA concentration is high, however...

11 March 2024 9,171 8 View

How to interpret my samples' results from D1000 ScreenTape Assay?

Hello All I prepared my library to run for sequencing. I would like to check the quality of my samples through D1000 ScreenTape Assay before add to sequencer. Can anyone help me to interpret my...

10 March 2024 8,764 0 View

Can anyone help with SHSY5Y cells differntiation?

Hello all I'm working with SHSY5Y cells to differentiate them to neuronal cells. I'm following the protocol with using RA, BDNF and cAMP for cell differentiation. I tried it different times but...

19 February 2024 1,672 5 View

Why Cryo cells (freezed cells) do not attached to the flask?

Hello all I'm working with SHSY5Y cells and I always made Cryo cells from them, them thawed them and used them without problem. But, recently, after thawing, they are remain floating and not...

19 February 2024 9,305 2 View

Can someone suggest protocol to produce knock-down cells by using shRNA lentivirus particles?

Hello All, I have shRNA lentivirus particles and I want to produce self-inactivating replication incompetent viral particles in cell by myself. My purpose is to produce knock-down cells in flask...

10 January 2024 6,425 0 View

Separation of organic acids-HPLC?

Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.

07 August 2024 8,782 3 View

Weak DAPI staining after immunohistochemistry - how to improve?

After immunohistochemistry of previously fixed in PFA and EtOH and then frozen 20 μm sections of zebrafish brain, DAPI staining is very weak (right) compared to the same sections stained without...

05 August 2024 9,637 2 View

Determining the worth of a point improvement in Hamilton Depression Scale?

Dear readers, Thanks for your attention. I am wondering about the health economic problem of quantifying the value of interventions which a) prevent, b) improve symptom profile and c) ultimately...

05 August 2024 3,246 1 View

How to isolate lymphocytes from mouse spleen?

I have tried several times to isolate lymphocytes from mouse spleen, but all attempts have been unsuccessful. I tried most available protocols. I used different dissociation media (HBSS with Ca...

04 August 2024 9,913 7 View

Conjugation of PEG-Amine to an Amino Acid Using EDC?

I am attempting to conjugate PEG to an amino acid at the C-terminus, for the purposes of producing nanoparticles. I have been told that PEG modified with amine groups can be used for this purpose,...

31 July 2024 2,033 1 View

Is it possible to use a safer acid instead of monochloroacetic acid to convert bacterial cellulose to carboxymethyl cellulose?

Hi, researchers, Is it possible to use a safer acid instead of monochloroacetic acid to convert bacterial cellulose to carboxymethyl cellulose?

29 July 2024 4,570 0 View

Do some Staphylococcus aureus strains have in vitro antimycobacterial activity ?

Some Staphylococcus aureus strains Inhibit the growth of Mycobacteria in Mueller Hinton Agar medium containing 10% OADC. Do some Staphylococcus aureus strains have in vitro antimycobacterial activity?

29 July 2024 10,023 2 View

My cfDNA extraction protocol using silica beads works with plasma collected in COD SAGM bags but not with plasma collected in K2 EDTA tubes. Why so?

I am currently performing cell-free DNA (cfDNA) extraction from plasma using an in-house developed kit that employs silica-coated magnetic beads. My protocol works effectively with plasma obtained...

28 July 2024 3,559 0 View

What is the Principle of Cysteine-carbazole-sulfuric acid reaction with glucose?

I have been looking for the principle of Cysteine-carbazole-sulfuric acid reaction in research papers and books, but couldn't find it. This reaction is mainly used for the quantification of...

23 July 2024 3,891 0 View

What does negative readings in spectrophotometer denote. Was testing TSS content of bacterial cultures?

I was performing estimation of Total Soluble Sugar content in bacterial cultures by Anthrone method. Out of 9 samples, only one sample showed positive reading while others had a negative reading...

22 July 2024 9,576 4 View