Questions tagged [units]

Units commonly encountered in biology: their definitions, usage, conversion.

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What is the unit for the vertical axis in multicomponent plot of qPCR

This is a typical multicomponent plot for a multiplex qPCR. Does anybody know the unit for the vertical axis representing the fluorescence?
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Converting microequivalents per liter to mg for sodium?

I read that a normal blood sodium level is between 135 and 145 milliequivalents per liter (mEq/L). Hyponatremia occurs when the sodium in your blood falls below 135 mEq/L. How do I convert mEq/L to a ...
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Nitrate fertilizer problem

Take the above problem. I understand how to do the calculation. However I can't seem to understand the units of the answer in the calculation. The answers illustrate the units as t/ha^-2 which is ...
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PCR: From transgene/microgram to cell concentration

I am doing research on CAR T-cell kinetics. The measurement of CAR T-cell concentrations across time is normally carried out with qPCR (see here, Fig. 1). These concentrations are generally reported ...
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What is the physical dimension of international unit (IU)?

I was skimming through a study [mRNA-based COVID-19 vaccine boosters induce neutralizing immunity against SARS-CoV-2 Omicron variant, page 6, figure 3(A)] on vaccine and I came across the ...
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Meaning of 5’–3’ in relation to ORFs

I was reading a paper in the journal Molecular Basis of Disease, which stated: The ORFs are arranged as replicase, and protease and major S, E, M, and N proteins which follows a typical 5’—3’ order ...
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Question on kilobase - packaging of genomic material in viruses

I have been looking up some information of SARS. Wikipedia says it is 29.7kb in length while 1kb is around 300nm. However, the microscope image on wiki shows the virus size <100nm. It doesn't make ...
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Definition of a Katal (unit of enzyme activity)

I am very confused about what one 'Katal' actually is. From Wikipedia, "The katal is not used to express the rate of a reaction; that is expressed in units of concentration per second (or moles per ...
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What is an inclusion forming unit?

What is inclusion forming unit load? I found it when reading this article. What does this measure and what information can be gained form it? Does this represent the amount of bacteria within a ...
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Where do I purchase this Trypsin?

I am currently on the lookout for Trypsin, but I have some trouble finding something that is fairly cheap, ships to Europe and is equivalent to this Trypsin: http://www.emsdiasum.com/microscopy/...
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how to quantify toxicity

When going through this link, Table 1, what are the numbers mentioned there? How is one quantifying toxicity?
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Convert flux value in nmol/min/mg protein to nmol/min/cell?

This is a question about unit conversion. I found an experimental measurement of the saturation uptake of glucose in yeast: $$V_\textrm{max} \approx 650 \textrm{nmol}/\textrm{min}/\textrm{mg protein}$$...
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