Model specification for moderation in multilevel model with R?

I've got longitudinal data from a psychological experiment and try to model the data using R package lme4. My dependent variable y is continuous and is measured at eleven occassions. Each...

13 April 2020 6,619 4 View

How to connect hypothesis to your discussion?

Hello, The question was answered. Thank you! Kind regards

12 January 2020 1,834 2 View

Convert units of pre-exponential factor in Arrhenius equation for reaction rate?

I found several pre-exponential factors for the reaction rate of calcium carbonate crystallization. They are usually given in m^4 kg^-1 s^-1. Is there any change I can convert them to m^4 mol^-1...

08 October 2019 3,770 1 View

Is it true that light produced in the core of the sun needs a million years to reach the surface?

Atoms in the sun core are very fast moving. I read, that for this reason the light produced as a by-product of hydrogen fusion cannot pass directly to the sun surface (which would be a matter of...

19 January 2019 3,495 3 View

If we look from Earth into deep space with our telescopes beyond our galaxy, is the universe uniformly dense in all directions?

26 January 2018 2,314 5 View

Best way to clean CTFE equipment in order to avoid DNA contamination?

Dear colleagues, I received different pieces of lab equipment (mainly pestils and alike) out of CTFE and would like to reuse the same pestils without autoclaving them every time. I do not have any...

29 August 2017 4,356 2 View

What shall I do, when I conducted an exploratory factor analysis and it doesn't identify two of my constructs as separated constructs?

I conducted an explanatory factor analysis (I used different rotations and used principal component). The explanatory factor analysis wasn't able to identify two of my model's constructs as...

25 July 2017 8,445 2 View

Has anyone observed that MIN6 progressively express less GLP1R with increasing passage number?

19 October 2016 3,228 1 View

(Spatial) Working memory task in headfixed mice ?

I am investigating (spatial) working memory in mice. Due to the nature of the project the mice are head-fixed and therefore are not able to move around freely, eliminating most common tests for...

04 July 2016 2,997 2 View

What are best practices and relevant tools of sustainable financial investments (& insurance meachnisms) in rural activities and/or landscapes?

In many rural areas of "developing countries" small scale agriculturalists (farmers/fishers/herders/...) see the necessity for (financial) investments, they have the capacities (social & human...

25 June 2015 5,367 5 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

Is there any test to determine the cardiovascular risk of patients with obesity? from the perspective of obesity?

We found tests to determine cardiovascular risk taking into account lipid profile, blood pressure, age, history of diabetes, other laboratories. But when weight is involved, there is a paradox. I...

02 March 2021 6,036 1 View

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

Dear All, I have access to some rodent fecal samples that have been stored at -20C instead of -80C. Anyone have experience with the impact of stowage condition on comparative metagenomic analysis...

01 March 2021 2,512 1 View

What SPSS analysis should I run with one IV (with two levels) and two DVs?

Hi, I am trying to figure out which test would be most appropriate to run for the following question: Is there a difference in task blood pressure between smokers and non-smokers? There are two...

01 March 2021 8,235 2 View

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

during ultrasound examination of acute abdomen, sometimes we see free fluid , can we know the type of fluid ,whether blood or not , using ultrasound only? if yes , what are the sonographic...

01 March 2021 7,476 4 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

Precipitate after adding laemmli buffer to protein solution containing Potassium Acetate?

Hi, I am running a size exclusion chromatography experiment with a buffer containing Potassium Acetate as a salt. I analyse these fractions through SDS-PAGE. After boiling my SEC fractions in...

01 March 2021 2,622 3 View

What could be some reasons why unstimulated monocytes are getting activated?

Im doing PBMC isolation -> CD14+ enrichment using magnetic beads -> stimulation setup. My negative control is just cells in cRPMI but they seem to get activated over and over again.

28 February 2021 7,883 3 View

For modelling epoxy-based matrices (in composites), which model in ABAQUS is the most suitable, Concrete damaged plasticity or Drucker-Prager model?

I am working on developing a micromechanical FE model for predicting kink-band formation in UD composites. To model matrix plasticity, which model, out of Concrete Damaged Plasticity and...

28 February 2021 5,415 1 View

Does different dilution factors affect negatively on NH3 reading ?

I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all...

27 February 2021 8,483 3 View