Recommendations for sample size in visual qualitative research (using children's drawings)?

Hi everyone! Asking for a little help, if I may. I am working on a research project, where I aim to analyse children's drawings about Covid-19. I am fairly new to using visual data in qualitative...

07 February 2021 9,530 3 View

Are there differences between performance of two identical Simple Wes machines?

03 December 2020 8,975 4 View

Best Cabinets for circadian rhythm studies in mice?

For those working with mouse models of circadian rhythm disorders, or using changes in the light-dark cycle to induce circadian disruptions, what is (are) the best options for cabinets during the...

07 October 2020 1,319 1 View

How do I produce a carbon composite consisting of 2 metals?

I have a question in regards to the formation of a carbon composite for wastewater application. I came across some articles that suggest doing co-precipitaition, however those articles requires...

20 September 2020 9,793 5 View

How do I fix my fraction collector, Frac-920 and AktaPurifier?

Hello all, I frequently use the Akta purifier for protein purification and recently have been getting error messages in unicorn saying "error 2012 no response frac, 900". The frac 920 is designed...

02 September 2020 2,757 1 View

Questions pertaining the use of Graphene from sugar: How effective is the coating?

Hi scientific community, I have read some articles pertaining to the use of regular sugar to form graphene composites would like to know some questions pertaining to it Is the composite...

07 August 2020 4,719 3 View

CSTR in series: why is it that 2 CSTR is series performs better then 3?

Hi all, I having some issues with the performance of my reactors. some context to question: 3 CSTR is series All of the reactors are equal in volume Reaction follows first order. (Fenton-based...

13 April 2020 7,459 3 View

Papers on Hop Domestication?

Hello, I am interested in learning about the natural history and domestication of Humulus lupulus. I have been unable to find any papers on this subject, so I am wondering if anybody could...

22 March 2020 4,157 5 View

Minimum levels of COVID detection?

Hello good people, This is not a normal question for me, but a friend in Public Health wanted to know, so I thought I would ask. The test for COVID is a PCR, if I am not mistaken. The question...

16 March 2020 3,322 2 View

No color in hot water extract after successive extraction with n-hexane and methanol?

Greetings I'm doing an increasing polarity successive extraction on tree leaves with n-hexane, methanol, and hot water successively. The n-hexane extract gave dark green coloration, while the...

04 March 2020 8,687 3 View

I got 02 moderator values defining Johnson-Neyman significance regions. Is it an error?

Hi everyone, I am conducting research for my Master's thesis. I am using PROCESS by Johnson-Neyman to analyze my Moderator model. I test the relationship between Public Service Motivation and...

03 March 2021 2,350 2 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 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

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01 March 2021 3,905 5 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

Is it necessary to report effect size (ES) in statistics of biomedical research given that we already report p values routinely?

Pls share your thoughts

01 March 2021 7,330 4 View

Why there are two peaks while using the mie plot of Silver nanoparticle?

Hi, I am trying to learn the theoretical modelling of silver nanoparticle using the Mie scattering theory. After that, I discovered a software named Mieplot developed by Philip Laven, where it...

25 February 2021 7,493 6 View

How to calculate Z (the number of molecules in a unit cell) for calculating theoretical density?

I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...

24 February 2021 3,823 2 View

How to handle studies which report perfect effect sizes in a meta-analysis using Pearson's r?

I'm in the process of updating a meta-analysis and in one of the new studies, effect sizes are reported as Tau-U. Two of the effect sizes are reported as Tau-U = 1.00. I am using Andy Field's...

24 February 2021 2,265 3 View

Sample size determination for non-parametric tests?

How do I run a a priori sample size determination for non-parametric tests, like the Mann-Whitney U-test and the Kruskall-Wallis or other non-parametric tests that accord with the unpaired t-test...

24 February 2021 166 6 View