Selecting particular columns from large datasets (csv) using R Studio?

So I have large number of csv files (100+) in a directory with same structure and column names. The data is in time series and there are approx 30 columns/file. However i only want to aggregate...

08 February 2021 245 5 View

How much pre-PCR dilution of mixed-template DNA extracted from pollen (honey) is appropriate for Metabarcoding?

I'm working on pollen DNA metabarcoding to identify the floral composition of honey. How much pre-PCR dilution of mixed-template DNA extracted from pollen (honey) is appropriate for the...

28 December 2020 9,132 1 View

How to add two vertical and parallel Fresnel reflection coefficients to retrieve overall reflection coefficient for a right hand circular wave?

I have a problem in which a right hand circular polarized wave (GPS wave) encounters an ideal smooth plane obliquely, and then is reflected off that. To solve this kind of problems, the wave is...

28 December 2020 2,271 3 View

Which is better to focus on teaching or research for a good academic life and Why?

Which is better to focus on teaching or research for For a good academic life and Why?

26 December 2020 5,737 9 View

Is ag paste suitable for back contact on silicon wafer? or i should deposit al on the back surface using pvd or plasma sputtering?

Fabricating silicon solar cell

22 December 2020 4,906 7 View

Which renewable source is the best ?

wind hydro solar etc.

21 December 2020 6,360 16 View

Why is light pure energy?

light is pure because the light is the simplest electromagnetic construct but the energy of any object is also of the same kind.

20 December 2020 207 4 View

How to handle Missing Values for Skipped Questions (Systematic Missing) in R ?

10 December 2020 435 4 View

What is the best industrial emulsifier to make silicon oil in water emulsion?

I need to make long-lasting stable emulsions of 6 wt. % percent silicon oil in DI water. The previousely made emulsions using Tween and Span Emulsifiers did not remain stable after a week.

31 October 2020 3,568 3 View

How to train my deep learning model using whale optimization algorithm?

I would like to optimize my deep learning model for sentiment classification using whale optimization in python, actually, I'm a beginner in python, I want the optimization algorithm to train my...

30 October 2020 4,876 4 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 4 View

How to include original NMR data in a manuscript?

hello. i am junior researcher. I received a comment from a reviewer that he could not find NMR data in my submitted paper. I had included the NMR graph with explanation and formula to calculate...

27 February 2021 734 4 View

Uncertianiny in using dry or wet basis in mixing a sediment with fuel oil?

Hello I'm currently working on a topic related to studying the anaerobic biodegradation of TPH in marine sediments. In this work, sediment should be mixed with fuel oil to a concentration of 20 g...

24 February 2021 9,839 3 View

Can anyone help or comment on solubilising chlorobutanol in aqueous injections in minimum time possible?

Please suggest solubilisation of chlorobutanol in injections. Tried pH and high temperature. But the issue is of assay drop. If anyone can suggest any solution. Its a commonly used excipient for...

21 February 2021 7,397 1 View

Why use both bead beating and enzymes (lysostaphin and lysozyme) for DNA extraction from sputum samples?

Hello, I have read in a few publications that to extract total DNA from sputum samples, both bead beating and enzymes are used to disrupt the cells. Bead beating is supposed to be efficient in...

18 February 2021 3,360 2 View

Which database could provide the signal sequence for targeting various cellular regions? ?

I am searching for thee database which could provide me signal sequence specific to the various cell organelle. such as signal sequence for mitochondria, signal sequence for endoplasmic...

04 February 2021 6,650 2 View

Whic Type of Thermal Camera is Good to use in animal research?

Hello dear researchers I want to use a thermal imaging camera to livestock study. I wonder which type to use. If you know or used a good type please comment or insert its online link in...

29 January 2021 4,163 4 View

Cross-sectional area and mesh sensitivity in lattice modeling of RC structural elements?

In lattice modeling of RC structures, what is the mathematical concept behind choosing the cross-sectional areas for the simulation of, for instance, beams? Besides, seemingly, simulating the...

26 January 2021 2,638 2 View

EMOJI-POLL-3 (Emoji-Association): Can you join the survey?

https://docs.google.com/forms/d/e/1FAIpQLSfaaCWZZqMIhoz5yj_5dxggvb6-cISx3GUHssYUWZWKbpx3UA/viewform Dear colleagues! We ask you to participate in a series of surveys related to the scientific...

26 January 2021 5,969 3 View

How commonly do you encounter Rummination Syndrome in your GI practice?

Do diaphragmatic breathing and speech therapy actually help? How often did you require multidisciplinary team approach?

17 January 2021 5,998 0 View