What is the minimum sample size for online survey?

Dear colleagues, Conducting an online survey for a Healthcare workers is limited only for the group who have access to Internet! What would be the minimum sample size in this case? Is a sample...

25 April 2020 7,309 15 View

How to avoid or minimise selection bias among convenient sample?

Dear colleagues, I am working on a sensitive topic regarding drug abuse, and population in my study are very difficult to reach and refuse to participate in an assessment for drug abuse pattern....

10 March 2020 2,577 3 View

Learning the basics of EEG analysis?where to start?

Hello, I am interested in learning how to process EEG data to use in clinical setting, I have a humble background in programming. I am a physician and I do not have much knowledge about the basic...

13 October 2019 458 3 View

Do you think that the retirement of professor or researcher from his job is a reason to freeze his activities and ideas?

Do you think that the retirement of a university professor or researcher from his job is a reason to freeze his activity and ideas after a long period of continuous giving and thus stop a...

21 December 2017 3,969 3 View

Separation of carbon dioxide from natural gas

Hi I am a PhD student in the Department of Chemical Engineering. University of Technology in Iraq. I am currently in the research stage. The study is about how to separate carbon dioxide from...

01 January 1970 9,118 9 View

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

Inexpensive eye tracking hardware + software solution?

Hello, I am starting a project that will require an eye tracking device. I've seen eye tracking hardware + software solutions that are $10,000+ so I am hoping to find one that is significantly...

18 January 2021 8,121 12 View

How to dissociate and culture retinal cells from mouse eyes?

We have a transgenic mouse line in the laboratory from which we are looking to culture retinal cells from. Our experiments indicate we might be able to produce stable cultures from these cells...

03 January 2021 7,200 6 View

How to develop mathematical model for Eye-Gaze tracking system?

Gaze tracking technologies are used in a wide variety of applications. Most gaze tracking systems require a personal calibration process where the user is instructed to gaze at certain points...

03 January 2021 9,675 5 View

What are the solvent requirement to study protein conformational changes via NMR?

I wanted to study the conformational changes taking place in gamma D crystallin (eye lens protein) at low pH via NMR. What would be the preferred solvent requirements for this particular protein...

31 December 2020 2,103 4 View

Why does using lens (achromatic doublet lens) for imaging detection onto camera affect magnification in Interferometric Scattering (iSCAT) microscopy?

Hello every scientific explorers!! Recently, I have been interested in Interferometric Scattering (iSCAT) microscopy, the scattering-based imaging microscopy. One of the problems I am facing is...

27 December 2020 8,092 2 View

How can I measure the bacterial growth in a wet fabric in a petri dish?

I have to measure the growth of the bacteria in a piece of fabric for my senior design project. I don't know how to measure it. The only way that I know is by the naked eye or by the microscope....

23 November 2020 2,897 6 View

What were the impacts of liberalization and globalization on Russia in the decade following the collapse of the Soviet Union?

I am writing an essay that will examine the negative impacts of globalization by criticizing the neoliberal paradigm through the lens of Russia during the 1990s.

19 November 2020 5,122 4 View

How to measure the point spread function of confocal microscopy using 405 or 440 laser lines?

100- 200 nm fluorescent beads are available from suppliers but only excited at UV (360 nm) or green and red range (i.e., >488 nm). Also. If the objective lens to be evaluated have (NA

18 November 2020 2,096 3 View

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17 November 2020 6,197 5 View