Flow cytometry or FACS is the sine qua non (without which, nothing) of the modern immunologist’s toolbox.

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#Id: 1218

#Unit 7. System Physiology – Animal

When extracellular Ca2+ concentration is increased  Ca2+ binds to the receptor  activates phospholipase C inhibits PTH secretion.

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#Id: 3004

#Unit 13. Methods in Biology

For isopycnic separation , density centrifugation is continued until the buoyant density
of the particle of interest and the density of the gradient are equal.

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#Id: 9725

#Unit 6. System Physiology – Plant

Constitutive chemical defenses are effective against many different herbivores, including insects and mammals. 

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#Id: 10046

#Unit 4. Cell Communication and Cell Signaling

In the absence of Delta, 

TM subunit of Notch on the surface of a responding cell is non-covalently associated with its extracellular subunit; extracellular domain is folded

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#Id: 6873

#Unit 3. Fundamental Processes

In human cells, the centromere- specific protein CENP-B is required to initiate modifications of histone H3 (deacetylation of K9 and K14, followed by methylation of K9) that trigger an association with HP1 that leads to the formation of heterochromatin in the region.