When comparing two very similar surveys taken over time, but with different sample size, what would be the best way to approach this problem?

Hi, I'm currently analysing a survey for a university course design, and some guidance would be very much appreciated. The students who are enrolled in a (year-long) course were given a link to...

08 December 2020 6,624 9 View

When analysing survey using Likert scale, is it okay to use Friedman's test?

Hi, I'm currently analysing a survey for a university course design, and some guidance would be very much appreciated. The students who are enrolled in a course were given a link to participate...

06 December 2020 6,060 2 View

How to use CCDC to find CIF files?

Seems like a silly question but I'm having trouble with searching for CIF files via https://www.ccdc.cam.ac.uk. I've used it before but I was on university campus so I think I was able to use more...

25 March 2020 1,271 3 View

Did anyone ever tried to extract springtails from muck soil with Berlese funnel?

We tried this last summer, but with no results, even if we were able to see them on the ground. We have already test for different heat sources (60W, 25W, 10W)...It seems that nothing is going...

01 February 2019 1,960 2 View

Why do I get variation in ELISA (sandwich) results?

Hello, we have been performing in our lab a validated ELISA test and we are getting a lot of variation in results. We have a std curve with each test and we also include a control sample and we...

02 March 2018 3,014 5 View

Can the result from Zetasizer analysis considered as the size of the nano particle?

11 May 2017 5,099 9 View

What is the process used to coat Ag with PVP? Could one just mix PVP with AgNP in distilled water and shake it?

Appreciate any input

10 January 2017 923 3 View

How to measure magnetic nano particle (iron) grain size without chemical compound?

Since SEM and TEM both have metal probe, I am wondering if there is any other way to measure magnetic nano particle (iron) grain size without chemical compound. I know that XRD could be an option...

12 July 2016 8,071 1 View

Perform classification data mining on attached dataset using Weka to build model that could be used to predict lateness?

Please help!!! I am new to Weka, and have to do a project for school regarding classification. Is there anyone familiar with Weka that would be willing to point me in the right direction? Thank...

19 April 2016 4,144 2 View

What is the influence of fluid leakages on vortex generation inside the diffuser of a pump tested in air?

When a pump is tested in air, fluid leakages are entering inside the pump through the gap betwen the impeller and the diffuser for some flowrates. These fluid leakages can significally modify the...

20 February 2016 4,696 3 View

Would you suggest me a formula for calculating energy yield from biohydrogen and biomethane production?

I was looking for a formula to calculated the obtained energy yield via biohydrogen and biomethane production using anaerobic digestion process. The unit is in SI unit (x) mLH2/g VS and (y) mL...

20 October 2020 8,668 5 View

Purification of commercial glutaraldehyde using activated charcoal?

Good day, Does anyone have any experience with the purification of commercial glutaraldehyde (GA) using activated charcoal? I am currently using the method as described by: Anderson 1967....

04 October 2020 8,866 4 View

Charcoal mediated steroid depletion assay?

Suppose, one is doing enzyme assay of an enzyme of a steroidogenic pathway. Is it necessary to deplete the steroids from the tissue/ cell homogenate before administering substrates to check enzyme...

21 September 2020 7,439 2 View

Carbon content over 100 in a charcoal sample under treatment at 1200 C?

After elemental analysis of the samples, carbon content of the charcoal was 102 (several repetitions were made, but obtained the same values), the equipment was tested with other samples of wood...

02 September 2020 1,971 2 View

Does anybody know the difference of the effect of the dextran coated charcoal stripped serum (DCSS) containing medium and DCSS containg medium?

Hi everybody, I have cultivated the C4-2 cell line in double charcoal stripped serum containing medium. A lot of the cells do not attach to the bottom of the flask. If someone has experience...

24 August 2020 9,634 2 View

Is it a good idea to build an reactor for Anaerobic Digestion or hydrogen fermentation using acrylic sheets or glass sheet?

Does using a reactor made of acrylic sheets beneficial for microalgae anaerobic digestion?

16 July 2020 9,062 2 View

Which Type of Biomass Source Will be Environmentally and Economically Superior in the Future?

Hello Dear Researchers, Given the potentials, and environmental and economic issues in the field of renewable energy, which type of biomass source will be environmentally and economically...

06 April 2020 162 2 View

In Iran which field (macroalgae or microalgae) do you think is more important to spend and why?

Due to the lack of broad algae market in Iran and this image's information, do you think the activities in which the field (macroalgae or microalgae) is more necessary?

13 March 2020 4,887 3 View

Where to purchase charcoal rat pellets?

Hello, We're looking to do a research project on gut motility in an animal model. Does anyone know of where to buy rat pellets to trace gut motility?

02 March 2020 1,648 1 View

How to achieve straight charcoal sections for microscopy?

Dear all, I am preparing wood charcoal for systematic vessel measurements, using an SEM and software that automatically recognises pores. I however have problems to achieve straight transversal...

26 January 2020 2,422 3 View