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Hi, I have several doubts about one paper (Systematic Literature Review) that was rejected. The main topic is Single-Board Computers in engineering education during the period 2010-2020. The...

01 March 2021 9,015 3 View

Must a control group to be in the same semester that a experimental group for a study in education?

Hi everyone, I'm researching about mobile learning in higher education. Due to the small number of the students in the semesters, I cannot have a experimental and control group together. I'm...

22 February 2021 3,653 11 View

Antibody amino acid sequence database to simulation?

Hello, I need your help. I am looking for a database of antibody amino acid sequences for later simulation in a program in order to analyze their structure. The antibodies I need to test...

18 February 2021 371 4 View

How do you prepare a standard dilution for qPCR?

I am very new to quantitative PCR and need some help for this technique. For my experiment, I need to perform a quantitative reverse transcription PCR. I extract the RNA from my pellet and...

05 February 2021 9,834 4 View

How long can we consider that the data obtained with qualitative social research methods are "current"?

I cannot find any reference that deals with the temporal validity of qualitative data. I think there is a gap in the methodological literature on the temporal validity of the research results and,...

05 February 2021 9,788 20 View

Does DNA A-tailing survive after agarose gel electrophoresis and purification?

Hi everyone, I need to clone in pGEM-T vector the result of amplifying a metagenomic library by PCR with a high fidelity polymerase but I only want to clone the fragments of an specific size...

04 February 2021 6,051 8 View

How can I solve this problem with agarose gel DNA purification of bigger (1-4kb) fragments ?

Hi everyone, I perform a PCR + Restriction Digestion (single cut, same at both sides) over a metagenomic library. After that, I am trying to purifiy DNA fragments between 1-4kbp long from the...

24 January 2021 2,190 5 View

What data analysis is applicable if my study will employ a Likert scale to establish association between certain factors and an ordinal variable?

My study aims to find what factors that lead to nurse stress are most significantly associated with nurse absenteeism. So the questionnaire will ask about these factors through a Likert scale...

17 January 2021 7,388 8 View

What is the most adequate (serum) dilution to use to determine IgE in mice serum via ELISA assay (commercial kit)?

We have a commercial kit from RayBioTech to determine IgE from mice serum. In accordance with the supplier's instructions, we have to use a dilution of 1:10000 of the serum. Is this dilution the...

06 January 2021 4,217 3 View

Is there any reference levels of IgE in healthy mice serum, like there are for other biochemical processes/components?

My question goes for reference levels of IgE in mice serum. I know that there are tables for the most common biochemical processes/compounds (red blood cells, white blood cells, AST, ALT, etc),...

06 January 2021 8,215 3 View

HiPSC positive for GLAST in FACS - why?

Hey, I'm working on hiPSC differentiation into astrocytes. I stained my cells (hiPSC stage) with a GLAST (ASCA1) antibody for FACS and the cells showed a strong positive signal. As far as I know,...

09 February 2021 3,383 4 View

What is a suitable method to freeze feeders-free, serum free episomal hiPSC?

Hi everyone, I need your professional advice: I started growing episomal iPSC (commercial cell line). I grow them in StemFlex medium. What would you recommend as the most effective freezing...

07 February 2021 8,591 4 View

What is the effect of room temperature on brain tissue intended for single nuclei RNA sequencing?

I am planning to do single-nuclei sequencing for brain organoids. However, the organoids experienced 25 minutes in room temperature prior to freezing. Most of the time they were in their culture...

17 January 2021 5,257 1 View

Can fibrosing cholestatic hepatitis in an immunocompromised patient be diagnosed without a liver biopsy?

provided that all the criteria for diagnosis has been fulfilled and alternative diagnosis are also ruled out. The patient has coagulopathy and transjugular biopsy wont be possible due to resource...

13 January 2021 8,935 4 View

Why are the organoid cells showing blue fluorescence even without dapi stain?

Mouse intestinal organoids ; After fixation and storage in PBS-T, when I checked in microscope, the organoid show fluorescent color blue even if I have not added DAPI. Does anyone have such...

05 January 2021 2,067 3 View

Why can I not see any plaques when performing a viral plaque assay with MHV?

28 December 2020 5,515 2 View

Are these IPScs Differentiated ?

Hi everyone, So these are images of IPSCs 2 days post passaging/splitting. I noticed that the overall morphology of colonies are not compact or round and without distinct border. However, at...

28 December 2020 3,503 3 View

Why is SV40 not considered an oncogenic virus?

Hello, SV40 is not considered an oncogenic virus in this review:Oncogenic viruses and cancer Why is SV40 not considered an oncogenic virus when it produces the large T antigen, which is...

04 December 2020 8,374 5 View

How do you fix organoids for IHC staining and H&E sections??

I work with ovarian cancer cell line organoids embedded in matrigel, they grow well the A2780 cells, but once I start using 10% formaldehyde to fix them they disintegrate...does anybody have a...

29 November 2020 1,900 1 View

What is the best way to get organoids of the same size?

I would like to get organoids of the same size. We filter organoids using a 100 um filter and then pass that filtrate through a 40 um filter followed by flipping the 40 um filter. Then we wash the...

22 November 2020 9,391 3 View