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

Where can I find life cycle inventory or assessment of non woven materials?

Dear network, I am looking for the LCA or LCI or at least the energy balances of the non woven fabrics process for my master project, in specific for natural fibers, yet I have found...

02 March 2021 9,662 1 View

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 5 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Standard curve shifting over time. How do I stabilise the ELISA?

24 February 2021 1,365 3 View

Steps to calculate activation energy by coats & redfern method?

I'm a chemistry student and I'm researching the kinetic degradation of mixed plastic waste. I'm having trouble calculating the activation energy by the coats & Redfern method. The data that...

24 February 2021 974 1 View

Is there an ideal incubation time of RGO-modified SPCE before subsequent use, i.e., electrochemical characterization or further modification?

I notice that upon washing and air-drying of my RGO/SPCE surface and characterizing again via DPV, the current response towards ferricyanide probe significantly decreases. My worry is that the...

22 February 2021 5,324 3 View

How can I measure the thickness of thin layers deposited on textured glass susbtrates?

I want to measure the thickness of aluminum oxide and titanium oxide layers deposited on textured glass substates. The layer thicknesses are typically below 100nm.

21 February 2021 5,465 4 View

What is the best etching method for Mg-Ca alloy?

I have used Picral etchant (4.2 g Picric acid, 10 mL Acetic acid, 70 mL Ethanol, 10 mL distilled water) but it didn't work. Is there any alternative?

21 February 2021 2,558 5 View

How to read a flow cytometry graph detailing cell cycle?

Hello everyone, When determining cells in different stages of the cell cycle, cells are stain for Brdu and Propidium Iodide. I understand how PI can be used to discriminate between G1 and S/G2...

18 February 2021 3,920 3 View