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#PALM

3 public questions tagged with this topic.

Microscopy

Which microscopy uses photoactivatable probes for super-resolution imaging?

Direct stochastic optical reconstruction microscopy belongs to single-molecule localization super-resolution methods. It relies on photoswitchable or photoactivatable fluorophores that transiently flip between dark and bright states in special buffers. At any moment only a sparse subset emits, so individual point spread functions do not overlap and can be fitted with nanometer precision. Thousands of frames accumulate localizations building a composite super-resolved image with 20-nanometer resolution. This blinking behavior enables resolving nucleosome arrangements, membrane receptors and vir

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Microscopy

Which of the following achieves resolution of 10-30 nm and uses photoactivatable proteins?

PALM utilizes genetically encoded photoactivatable fluorescent proteins like mEos and Dronpa. Initially dark proteins are sparsely photoactivated by low-intensity violet light, imaged, then photobleached, ensuring only few molecules emit simultaneously. Gaussian fitting of each spot provides ~20 nm localization precision. Repeating this activation-imaging cycle builds a super-resolved map from thousands of localizations. Achieving 10-30 nm resolution, PALM is particularly suited for live-cell studies of molecular clustering, because photoactivatable proteins can be fused endogenously and track

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Microscopy

Which method randomly switches fluorophores between dark and fluorescent states for high-precision localization?

STORM achieves super-resolution through stochastic photoswitching of organic cyanine dyes. Individual fluorophores randomly transition between dark and bright states so only sparse subset emits per frame. Precise Gaussian fitting of each blinking event localizes molecules with 10-30 nanometer accuracy. Iterative activation, imaging, and bleaching cycles over thousands of frames systematically reconstruct complete nanoscale architecture. This single-molecule localization strategy overcomes diffraction by temporal separation rather than optical narrowing, revealing detailed organization of micro

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

View Details