What statistical test should I use to compare SDs in R?

I'm currently doing some analysis for my dissertation project and I was wondering what statistical test is best to perform. I have to compare the SDs of each participant (64 participants with 64...

07 February 2021 4,837 4 View

Where could I purchase whole cells with 5-HT (serotonin) 1B receptors?

Hi! I would like to study 5-HT 1B (Serotonin 1B) receptors and conduct a Gi CAMP assay on it. As you know, this is a functional assay that requires whole cells and not membrane preparations. Do...

19 January 2021 3,614 2 View

Any leads on open-source RI libraries?

Hi! Does anyone know any libraries where we can access retention index data (gas chromatography) of aroma compounds for free? Thanks!

07 December 2020 1,951 1 View

Is European Journal of Education Studies a good journal for publication of an article from a dissertation?

I sent an article to the journal and the reviewers indicated that the work can be published as it is. there were no suggested corrections and this left me wondering if its a recommendable journal....

19 May 2020 8,131 3 View

COVID-19, lockdown and the transition from physical to virtual online classes?

After COVID-19 outbreak was declared as pandemic, may countries including India face mounting pressure to close universities including my university, Sikkim University. After lockdown was imposed...

12 April 2020 3,781 19 View

Is it okay to use Technical/Laboratory Grade solvent for extraction and open column chromatography?

Some would say that the process of separation through the use of high-grade silica and other chromatographic materials will eventually result to separation of impurities so it's okay to use...

12 January 2020 9,987 5 View

How do you improve peak separation in this case (Please see attached picture) ?

How do I improve the peak shape and resolution in this region of the chromatogram? Analytes are volatiles in the headspace of rice. Column is DB-Wax-- a column reported to be successful in...

24 November 2019 7,250 3 View

Why are there fewer peaks in a gas chromatogram with longer run times than with shorter run times?

Lengthening my GC run time from 14 min to 34 min resulted in fewer peaks. The target compound that I am trying to quantify is not detected whenever I run my samples (same extraction conditions)...

08 October 2019 7,512 6 View

Can anyone recommend a good SEC-HPLC column that can be used with peptides at pH 2.5?

I am intend to buy a SEC-HPLC column that is suitable to used with the peptide Glucagon(29 amino acids) at a pH=2.5. Can anyone recommend a column that might be suitable? The company, APEX, that...

29 August 2019 6,027 1 View

What are suitable peptides/proteins to build a calibration curve for SEC-HPLC in a low molecular weight range?

I want to do HPLC-SEC that characterizes the low-order oligomers for the low molecular weight peptide Glucagon(Mol.Wt.=3.48kDa). Does anyone know suitable reference peptides/proteins that could...

21 May 2019 7,637 4 View

Buffer Exchange using column packed with sephadex G-25 effect on protein concentration?

Hello, If i am doing a buffer exchange for an antibody of 1mg/mL, does the elution lose protein in the process of buffer exchange? For example, if i flow through 500 uL of 1mg/mL sample, and...

03 March 2021 6,299 3 View

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03 March 2021 5,360 2 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

How can we raise the figure when we writing a paper with Latex ?

Hi, everyone. I'm a starter to write a paper by Latex. But I have some difficulty using it. I'm writing the paper with 2 columns. And, there is one figure that occupies the 2 both-sides. I want to...

26 February 2021 3,738 3 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 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

What is the best way to calculate the angles of twist for concrete columns subjected to torsional moment using finite element software?

In Finite element software like ANSYS , there is difficulty in obtaining direct results of twisting of concrete members because SOLID65 which is the unique element designed to represent concrete...

26 February 2021 3,806 2 View

Compute for the total volume of concrete needed for the concrete pouring of the foundation including its column up to NGL only as shown in the plan?

Looking for the quantity of cement, sand, and gravel of footings and columns. Thank you!

25 February 2021 3,092 2 View