Can random sampling have inclusion criteria?

As random sampling means that everyone in the population have an equal chance to be chosen, can it have inclusion criteria? My research participants have been chosen based on the inclusion...

26 February 2021 6,905 10 View

Hye All, Greetings, How can i get surface run off water data?

this is for my thesis project, so this is the title of my thesis, the effect of land use on hydrological components in Muar, Johor, Malaysia any ideas, guidance, and suggestions all? Thank You, :)

02 February 2021 265 5 View

What is the difference of FTIR for functional properties and structural properties of protein?

I need to send my sample to outsource laboratory and how can i tell them that i want to run the FTIR for structural properties of protein? is there any differenece between FTIR for functional...

15 January 2021 8,992 1 View

What's the correct way of treating ordinal variable as continuous in regression?

08 January 2021 920 16 View

Does low pHPZC (Zero point charge) indicates higher negative charged surface ?

I found that, there is a difference in pHPZC value when higher impregnation ratio of acid on adsorbent surface. Lower pHPZC value when higher ratio of acid impregnation and adsorption performance...

05 January 2021 7,224 3 View

Why do I see many vacuoles on my cancer cells?

I am currently growing BICR31 cancer cells for conditioned media collection, and as I passaged it I have seen many bubbles/vacuoles - like structures. Cells were healthy during the first split...

05 January 2021 2,320 5 View

How can be the Virus COVID-19 become mutation?

The current situation the virus become mutation, but there were information that zero percent case in Wuhan?

31 December 2020 2,457 4 View

Why does activation process called as activation? what does the term means actually?

I'm referring to activated carbon activation. Activation process does increase the surface area and functional groups content in activated carbon compared to biochar and raw biomass. But I'm...

30 December 2020 6,514 1 View

What is the good water absorption value for construction materials (brick, mortar etc.)?

According to many construction standards such as ASTM, a good construction material should have a water absorption value within 20%. However, if we compare with many water absorption values (from...

26 November 2020 8,538 8 View

What sample extraction/ preparation needed prior HPLC test?

I want to screen the presence of plastic additives in a few water samples using HPLC-UV. I am very new to HPLC, and after doing a reading on the sample preparation for HPLC, I found there are a...

19 November 2020 2,724 4 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

How to improve the buffer capacity of sea water?

Hello everyone I would like to improve the buffer capacity of seawater (pH ~8) in order to dissolve as much CO2 as possible without dropping the pH below 7.5 (a range between 7 - 7.5 is...

17 February 2021 2,797 2 View

Can I measure absorbance efficiency with wavelength in a spectrophotometer?

I measure the wavelength of material in a spectrophotometer and it peaks at 275 and its absorbance is 100. I mix it with an adsorbent and it adsorbs the first material, but when I measure the...

16 February 2021 7,515 5 View

CAT assay in microplate?

I'd like to know if anyone can provide me with a protocol for traditional catalase enzymatic assay in a 96 well microplate, for cell line and/or C.elegans spectrophotometric measurements. Thanks!

11 February 2021 7,273 3 View

How can I quantify the color of a solution?

I know colorimetry has been the standard way by way of measuring the concentration of a particular compound (solute) in a colored solution (solvent or measure quantities of a particular compound...

08 February 2021 2,673 1 View

Bradford assay for insulin: discrepancies between standard curve and sample concentration during crystallisation?

Hi there, I would like to determine the unknown concentration of human insulin in my sample during crystallisation (the concentration range is roughly 0.5 -2 mg/ml, whereas the initial...

06 February 2021 9,370 7 View

RNA concentration: Nanodrop vs Agilent 2100 Bioanalyzer?

Hi guys. I make RNA by in vitro transcription and do cell transfection afterwards. I analyze RNA using Nanodrop and Bioanalyzer. But I found the concentration of RNA measured by these two machines...

05 February 2021 292 3 View

What dilution do I use for my GNP solution UV-Vis and DLS characterization?

I have prepared gold nanoparticles using the citrate reduction method in the lab. I need to characterize them using UV-Vis and DLS, by how much should I dilute my sample for using it in the...

26 January 2021 530 5 View

How to calculate DNA concentration of a sample with high concentration buffer?

I want to calculate the concentration of DNA in an unknown sample. But it's buffer has a high concentration and our nanodrop don't accept that as a blank of dsDNA. Thus I dilute the buffer with...

23 January 2021 9,440 2 View

Anyone know how to dilute strong hydrogel structure?

I am working on PVA-GMA hydrogel that is a really strong polymeric structure like rubber. Because I am in the middle of analysis, it is difficult to dissolve the gel using a common solvent. I...

20 January 2021 3,501 2 View