How to remove the species data from rda data frame in R (only remain the sites/samples point)?

Dear everyone, When I using the rda function in r, I met this question. As you can see in the figure, there are a lot of deep blue points which refers to the species. But I would like remain...

15 February 2021 8,982 2 View

Whether L version and D version peptidesshould have identical NMR, especially in the state of self-assembly?

Whether L version and D version peptides should have identical NMR, especially in the state of self-assembly have to have identical NMR? How to use HRMS to confirm L version or D version...

01 February 2021 6,756 4 View

What are possible factors influencing the isotope-based hydrograph separation in river confluences?

When performing hydrograph separation (EMMA method) with isotope tracers in river confluences (natural large basin), we found that the contribution of each end member sometimes exceeds the...

20 January 2021 8,403 5 View

Can you have pressure inlet and velocity inlet at the same time?

I was reading a reference (Reitz-A Photographic Study of Flash Boiling Atomization). In his experiment, his boundary condition is delta p and constant velocity. The liquid injection pressure was...

18 January 2021 842 9 View

How to determine additional cycle numbers using qPCR in ATAC-Seq?

I am doing ATAC-Seq with OMNI-ATAC-Seq protocol (Kaestner Lab 2019). I did PCR amplification for 5 cycles of my library. Now I use 5ul of the PCR product to do a qPCR to determine how many...

12 November 2020 3,678 1 View

How to visualize influenza PR8 plaques while the infection is successful?

Hi, everyone, I am optimizing my protocol of influenza PR8 plaque assay. I am following the classic protocol. But I ran into problems when I am trying to visualize plaques at the high virus...

25 August 2020 2,017 1 View

How to extract absolute refractive indices of an optical fiber from an refractive index difference plot?

10 May 2020 2,402 13 View

Do you think current guidance for COVID-19 prevention is correct?

CDC provided guidance to the public "Wash hand, disinfect surfaces, cover sneezing" ever since the outbreak of COVID-19. I get a strong sense this guidance is for contact transmitted disease...

01 April 2020 8,279 1 View

Where is the TSS (transcription start site) following CAG promoter?

The commonly used CAG promoter is usually labeled as three parts, take pCAGGS-mCherry (https://www.addgene.org/41583/) for example. CMV enhancer + chicken beta-actin promoter + chimeric...

13 February 2020 7,125 2 View

Google scholar inflates citation count?

Google scholar included under "Cited by" a few papers that did NOT cite my papers or book chapters. This inflates citation counts of some of my publications. How can this be corrected?

29 November 2019 2,469 4 View

In DFT or HF, is it more expensive to calculate the H matrix or to diagonalize it?

I was wondering: in common DFT (or Hartree-Fock) algorithms/codes, and in particular in solving the Roothan equation, what is the most computationally expensive part: 1- evaluate all the terms of...

01 February 2021 396 2 View

Do you have an example of an algebraic Hamiltonian vector field which possess a finite number of periodic orbits?

Is there a polynomial Hamiltonian vector field with a finite number of periodic orbits? Please see this MO question:...

21 January 2021 1,673 4 View

In a random graph, the number of paths that cannot be extended in an hamiltonian path, can be roughly be separated in two equal parts ?

In a random graph, the number of paths that cannot be further extended in an hamiltonian path or an hamiltonian cycle, can be roughly be separated in two equal parts? I have an idea for solve for...

07 January 2021 9,782 2 View

How to run a Hamiltonian Replica Exchange Molecular Dynamics in the Gromacs patched with plumed?

Dear all, I'm trying to employ replica-exchange with solute tempering 2 (REST2) in a system, but I have performance issues in the calculations. I'm using openmpi-3.0.0 and gromacs 2019.4 patched...

29 September 2020 2,963 1 View

Can anyone suggest the exact method to calculate Single-Band Effective Mass Hamiltonian for Germanane chair structure?

Hi all, Currently I am working on NEGF methodology. I read the atomistic Hamiltonian calculation method. But I need to know the method to generate single-band effective mass Hamiltonian for...

12 September 2020 5,297 1 View

Standard guitar tuning has two distinguished vectors (0 5 5 5 4 5) and (0 5 10 15 19 24). What is required to show they are tangent-cotangent bundles?

The pitch value set in music and guitar group in tablature are connected by adjunction of tangent-cotangent bundles. Tuning g is the tangent gradient to the flow of pitch on guitar. It determines...

04 April 2020 2,681 15 View

Our "On the Duality Condition..."received many citations in ModularHamiltonians/Conforma papers.What's the big picture import of these papers?

When I receive many notifications of citations of my 1975 paper on the duality condition for quantum fields, I take a look at the new reference. But although I can roughly follow the arguments...

29 March 2020 1,051 5 View

I'm looking for two older articles on the Hamilton Anxiety Rating Scale (Refs below). Does anyone have?

Hamilton, M. A. X. (1959). The assessment of anxiety states by rating. British journal of medical psychology, 32(1), 50-55. Hamilton, M. (1969). Diagnosis and rating of anxiety. Br J Psychiatry,...

09 February 2020 5,958 3 View

Why is the temperature in NVT-MD with a Langevin thermostat too low?

Over the years I have repeatedly encountered the problem that NVT dynamics of simple liquids and solids with a Langevin thermostat do not manage to keep the desired temperature. I have observed...

01 February 2020 9,695 2 View

I'm looking for two older articles on the Hamilton Anxiety Rating Scale (Refs below). Does anyone have?

Hamilton, M. A. X. (1959). The assessment of anxiety states by rating. British journal of medical psychology, 32(1), 50-55. Hamilton, M. (1969). Diagnosis and rating of anxiety. Br J Psychiatry,...

01 February 2020 6,671 3 View