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Tim Bushnell

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Articles by Tim Bushnell

Introducing CyTOF: Cytometry of the Masses

Introducing CyTOF: Cytometry of the Masses

By Tim Bushnell | July 19, 2016

Flow cytometry remains unparalleled as a single-cell analysis technology.  The ability to analyze 14 or more fluorescent parameters on a million cells or more allows for detailed understanding of complex biological processes. The Problem With Traditional Flow Cytometry One limitation of flow cytometry is the reliance on fluorescent tags.   Even with careful panel design, loss…

Introducing CyTOF: Cytometry of the Masses

An Introduction to Spectral Overlap and Compensation Protocols in Flow Cytometry

By Tim Bushnell | July 9, 2016

It strikes fear into the hearts of new cytometrists. Compensation. More fights have started over the proper way to compensate at meetings than anything else. This article will strive to shed some light on the principles of compensation, and equip you with the tools necessary to achieve compensation mastery for your research experiments. Compensation is…

Introducing CyTOF: Cytometry of the Masses

Setting Voltages for Optimal Sensitivity

By Tim Bushnell | June 2, 2015

After panel design, and titration of the reagents, the next most important step in flow cytometry is setting the proper voltages on the photomultipler tubes (PMTs). These detectors take the photons of light emitted by the fluorochromes on the cells and convert them to electrons, which ultimately become the voltage current that is digitized and…

Introducing CyTOF: Cytometry of the Masses

Importance of Antibody Titration in Flow cytometry

By Tim Bushnell | February 17, 2015

After designing a multicolor flow cytometry panel and securing the necessary cells and reagents, the process of optimization of the panel can begin. The first step in that optimization is titration of your antibodies. In this process, following a standard protocol to be used in the final analysis, you stain a known amount of cells with…

Introducing CyTOF: Cytometry of the Masses

Beginners Guide to Designing Your Own Polychromatic Flow Panel

By Tim Bushnell | February 3, 2015

“The greater the power, the more dangerous the abuse.” – Edmund Burke “With great power comes great responsibility.” – Uncle Ben (quoting Voltaire) While it’s unlikely that either of these speakers performed multi-dimensional flow cytometry, it is important to remember these quotes in the context of developing and implementing a good polychromatic flow panel.  More fluorochromes are…

Introducing CyTOF: Cytometry of the Masses

A Numbers Game: the ‘How’ and ‘Why’ of Counting Cells

By Tim Bushnell | January 20, 2015

“It is the weight, not numbers of experiments that is to be regarded.”  Isaac Newton Read any flow cytometry protocol and somewhere near the beginning will state something to the effect of ‘Place 1 million cells into a tube.’ The question is, faced with that special sample for THE experiment, how do you count cells…

Introducing CyTOF: Cytometry of the Masses

Take Control of Your World – Five Controls for Flow Cytometry

By Tim Bushnell | August 19, 2014

No, this is not a call for Geeks to take over the world – just a tiny part of it – the part that ensures success in all experiments or at least a good way to analyze them if they fail. There are all too many entry points for error and variability that can be…

Introducing CyTOF: Cytometry of the Masses

Biosafety in Flow Cytometry – To Be or Not to Be…

By Tim Bushnell | July 15, 2014

Biosafety is one of those things many scientists don’t take seriously. I would guess, that like politics, there are 40% who believe biosafety is ‘over-emphasized’ and 40% who swear by biosafety. 20% are undecided. Needless to say, I’m on the side of biosafety. And here’s why: “CDC announced today that approximately 75 Atlanta-based staff are…

Introducing CyTOF: Cytometry of the Masses

Chasing the Pot of Gold at the End of the Rainbow: Choosing the Right Fluorochromes for Your Flow Cytometry

By Tim Bushnell | June 3, 2014

With the current proliferation of new dyes and instruments that can detect many colors simultaneously, it seems like an entire rainbow is at your disposal for your flow cytometry experiments. And we know that when designing a polychromatic flow cytometry panel, more is often better – right?  The more antigens you can detect, the more…

Introducing CyTOF: Cytometry of the Masses

Seeing is Believing: An Introduction to Imaging Flow Cytometry

By Tim Bushnell | May 13, 2014

What if there was a way to take the power and speed of a flow cytometer and couple it with the resolution of a microscope? Imaging flow cytometry does just that! Flow cytometry is a very powerful tool for the complex characterization of cells and cell populations but flow cytometers can also be thought of…

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