Advanced Imaging Techniques for Life Science Research
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What is resolution in microscopy?
The ability to distinguish two closely spaced objects as separate; depends on wavelength and numerical aperture.
How is resolution different from magnification?
Magnification enlarges an image, but resolution determines the clarity—how close two objects can be while still distinguishable.
What three key parameters define a microscope’s performance?
Resolution, magnification, and detection.
What factors affect resolution in light microscopy?
Wavelength of light, numerical aperture of the objective lens, and refractive index of the medium.
Why is detection distinct from resolution?
Detection depends on brightness and signal-to-noise ratio; an object may be visible but not resolvable.
What is the diffraction limit of light microscopy?
About 200 nm laterally and 500 nm axially.
What does it mean if two structures are ‘unresolved’?
Their diffraction patterns overlap so they appear as one blurred image.
What is the relationship between brightness and visibility in microscopy?
Brightness can determine detectability even if two points are not optically resolved.
What is the basic principle of light sheet microscopy?
A thin sheet of light illuminates the sample plane by plane, reducing photodamage and allowing fast 3D imaging.
Why does light sheet microscopy cause less photodamage than confocal microscopy?
Only the imaged plane is illuminated, not the entire sample volume.
What is the main advantage of light sheet microscopy for live imaging?
It enables long-term, high-speed imaging of developing organisms with minimal phototoxicity.
Which 2008 study demonstrated light sheet imaging of zebrafish development?
Keller et al., Science 322:1065–1069.
What challenges come with light sheet microscopy data?
Managing and analyzing large 3D image datasets to extract quantitative information.
What is lattice light sheet microscopy?
An advanced form of LSM using a lattice of Bessel beams for higher spatiotemporal resolution with minimal damage.
What is one biological process ideally studied by light sheet microscopy?
Embryonic development or long-term organoid growth.
Why do we need super-resolution microscopy?
To overcome the diffraction limit of conventional light microscopy (~200 nm).
What are the three major families of super-resolution techniques?
SIM (Structured Illumination Microscopy), STED (Stimulated Emission Depletion), and PALM/STORM (Single Molecule Localization).
How does Structured Illumination Microscopy (SIM) work?
Projects patterned light onto the sample and reconstructs higher-resolution images from the interference patterns.
What is the resolution limit of SIM?
Approximately twice the diffraction limit (~100 nm).
How does STED microscopy achieve super-resolution?
Uses a depletion laser to switch off fluorescence around the excitation point, leaving only a sub-diffraction region emitting light.
What does STED stand for and who developed it?
Stimulated Emission Depletion microscopy, developed by Stefan Hell.
What is the typical resolution achieved by STED?
Around 30–80 nm.
How do PALM and STORM differ from SIM or STED?
They rely on the precise localization of single fluorophores that are activated stochastically over time.
What do PALM and STORM stand for?
PALM – PhotoActivated Localization Microscopy; STORM – Stochastic Optical Reconstruction Microscopy.