How to test the equality of two proportions with multiple samplings?

02 February 2021 9,574 5 View

How to compute pressure drop on liquid ammonia line?

I have to analyze an existing ammonia line to estimate the pressure drop in it. The line is designed to transport liquid ammonia. I can compute the pressure drop with standard friction factor...

21 November 2020 5,494 3 View

Problem executing MrBayes. Help?

Hi, I'm trying to run MrBayes 3.2.7 with a matrix of 37 species and 20561 nucleotides. I consistently receive the following error: MrBayes > Execute...

18 November 2020 3,867 3 View

How we can avoid or minimize problems of latency when making music in group through the web in real time.?

During the lock down and this pandemic one of the barriers that for music educators have become a dificulty has been the problems of latency in videochats, difficukting, even making unviable to...

07 November 2020 3,612 2 View

How can you order the clasification in CORINE legends, from a year to another, in type of vegetation?

For example, CORINE clasificate a zone of pasture one year, but in the next temporal clasification give crop of dry cereals, and preview clasification don't find. How can I order then?

20 October 2020 3,913 1 View

Does the molecular weight of PVP matter in CTAB buffer for DNA and RNA extraction?

I am preparing CTAB buffer and I read that addition of PVP (Polyvinylpyrrolidone) helps to remove phenolic compounds. Most of the times in protocols there is no additional information about...

05 September 2020 7,488 4 View

No title

Online data repositories are useful tools that ensure the reproducibility and repeatability of scientific investigations. For the sake of facilitating collaboration between researchers in the...

31 August 2020 4,826 3 View

How can I check nuclear RNA integrity? Is the RIN useful?

we are trying to obtain RNA from nuclei and RINs are very low no matter what we have tried. ...Should the RIN be used? is there another method to assess the quality of the nuclei RNA? THANKS

16 June 2020 570 12 View

best practices to check linear regression assumptions?

Hi everyone! I'm conducting a linear regression and I need to check the model assumptions. I wanted to ask what are the current best practices, and of you could provide a referente. Furthermore: I...

25 April 2020 7,888 17 View

Can the origin of the cognitive constructs that characterize us be produced by the coevolution of innate human cognitive capacities?

We know that the cognitive capacities that most characterize us are theoretically constructs, that is, non-observational concepts that do not have a concrete existence similar to the physical...

19 March 2020 2,427 3 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

How to know if 87Sr/86Sr is reliable for Sr isotope chemostratigraphy in marbles?

I am currently looking for parameters to know if 87Sr/86Sr data is reliable for chemostratigrahy in marbles, and/or parameters to know if those marbles have had some post-depositional...

30 November 2020 9,032 8 View

Which isotopes can be used for preserving agricultural products?

Different kinds of Isotopes are playing very important roles in agriculture. They are used to detect different nutrient elements in soil and other crop improvement program. But which isotopes and...

16 November 2020 9,248 7 View

Dear fellows, what models are there available for water stable isotopes in the vadose zone?

I'm aware of Hydrus and Netpath, but are there others? I am highly interested in water stable isotopes in variably saturated and non-equilibrium flow (double porosity/permeability). Any hints...

21 October 2020 9,395 2 View

Have you published anything about the Ebrahimi meteorite? If so can you comment on anything pertaining to the isotopes of oxygen seen?

Did you see any evidence of D-ribose or other organic chemistry?

14 June 2020 9,565 8 View

What program/software can I use to search/mine a high resolution full scan mass spectrum (QTOF) for halogen isotope patterns?

For Bromine, the program would be able to go though each of the m/z's in the full scan, add 1.99795 (difference in mass between 79Br and 81Br) to that m/z, determine the intensity ratio between of...

16 May 2020 7,373 2 View

Does anyone has good references to "Organic x Inorganic CO2 in the atmosphere"? Volcanos x Burning fossil fuels?

I need more details and references about: the increase in carbon observed in the atmosphere is the organic origin CO2, not the inorganic origin CO2 released when a volcano erupts. Evaluation of...

19 March 2020 948 3 View

Suitable Software for the Interpretation of isotopic data?

I am currently working on the effects of climatic and vegetational change on mammals for past 15 Ma. I want to ask that how the data of oxygen and carbon stable isotopes can be interpreted in the...

26 January 2020 970 3 View

How do stable isotopes (not radioactive) form in stars and other bodies in the universe?

I was once told that stable isotopes of lighter elements such as H, N C , etc are found in stars, planets, etc. Can anyone suggest any literature which talks about the formation of these isotopes?

15 December 2019 6,535 3 View

How to perform Common Pb correction using Isoplot Excel version?

Hi everyone I have been working on U-Pb geochronology of accessory phases mostly zircon, monazite, rutile, titanite and apatite. I would like to know how I can do common Pb correction using...

11 December 2019 8,806 1 View