How to perform PCoA in R with given UniFrac distance matrix?

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Recommender system for choosing university electives - what recommendation algorithm should we use?

Hi, We want to make a recommender system for students who are in the process of choosing electives at their University. So basically what we want to figure out is: If student x has chosen e.g....

08 December 2015 8,531 11 View

Has anyone experience with fractionation of broadly distributed polybenzyl acrylate via SEC and a fraction collector?

I'm trying to fractionate polybenzyl acrylate for quite a while to get narrowly distributed fractions of different molecular weight, but I can't get a sufficient separation or I have high...

16 March 2015 1,225 3 View

What statistical analysis should I use for Likert-Scale data?

I am trying to determine whether there is an association between time spent online and reported problems. I have divided my participants into two groups: the low user group and the high user...

28 March 2014 3,449 84 View

Which functions are related to different brain rhythms?

Can you suggest good material about the functions of different brain waves (delta, theta, alpha, beta)? In which processes different rhythms are involved? I have found some material of course, but...

09 July 2013 7,953 18 View

Dear all, Can we keep cell line in -80oC for more than 1 year?

I will use this cell line to study the efect of herbal medicine on lactogenesis (proliferation and differentiation of mammary cell).

24 January 2012 6,075 2 View

How to classify strictly upper triangular matrices by similarity?

Let F be a field. Consider U, the set of n times n strictly upper triangular matrices in F. For X, Y in U, we call them similar if there exists some S, which is non-degenerate and upper...

01 March 2021 2,957 8 View

Is CD44 degraded in lysosome together with hyaluronan after CD44 mediated endocytosis of hyaluronic acid?

Also when RHAMM binds hyaluronic acid, they get internalized, will RHAMM also be degraded? Or both CD44 and RHAMM will be transferred back to the cell membrane? Asking for breast cancer cell line...

01 March 2021 8,169 2 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

How to find a correlation between coordinates in a curvilinear coordinate system?

Hello. I have a skewed elliptical coordinate system (I use alternative elliptical coordinates). And I need to determine connections between coordinates in order to fetch a covariance matrix of...

28 February 2021 364 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

What are the methods used for CNT..?

Respected Professor's i hope you are doing well and happy. i need some information about carbon Nanotubes. before blending the CNT with the matrix the CNT has been introducing in some treatments....

24 February 2021 5,383 5 View

How can I generate random samples from Bingham distribution in R? How can I construct those symmetric matrices?

in the function rbingham(n,A) in R software how can I construct that A (symmetric) matrix?

24 February 2021 3,528 3 View

How does the injection volume impact LLOQ and ULOQ in regression analysis (LC-MSMS)?

Hello, I have run into an issue that has sparkled a debate at work: is the LLOQ/ULOQ impacted by injection volume under the following circumstances: 1) Same dilution factor of all samples 2)...

23 February 2021 9,159 3 View

Multinomial probabilities and confidence intervals - obtaining the CI of the reference category?

Hi, Some background to my question: I have fitted 1st order multinomial Markov models with covariates. Since all probabiilties (for each row of the transition matrix) sum to 1, I estimate only...

22 February 2021 2,541 4 View