Auxins in biological samples can be determined by bioassay, mass spectrometry, or enzyme-linked immunosorbent assay (ELISA).

The Avena coleoptile curvature assay is a sensitive measure of auxin activity (it is effective for IAA concentrations of about 0.02 to 0.2 mg L–1).

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#Id: 4605

#Unit 13. Methods in Biology

Other dyes that bind to DNA and allow for similar types of cell cycle analysis include DAPI, Hoechst 33342, and 7-aminoactinomycin D (AAD).

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#Id: 7735

#Unit 1. Molecules and their Interaction Relevant to Biology

The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

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#Id: 2655

#Unit 7. System Physiology – Animal

About 25 percent of the filtered loads of sodium, chloride, and potassium are reabsorbed in thick segment of the ascending limb of loop of Henle

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#Id: 10037

#Unit 4. Cell Communication and Cell Signaling

IL-1β receptors contain a globular TIR domain; binding of IL-1β to IL-1 receptors triggers dimerization

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#Id: 8644

#Unit 2. Cellular Organization

Phosphorylation on multiple sites by G1 CDKs blocks Rb from associating with E2F and promotes its export out of the nucleus.