What is Vivo 2 photon imaging?
In vivo two-photon imaging is an analytical approach that can be used to visualize cell dynamics and hemodynamics in organs or tissues of live animals.
What does calcium imaging tell you?
In vivo calcium imaging provides the means to study specific populations of neurons within or across brain regions in freely-behaving animals. Thus, neuroscientists can investigate how neural activity may be linked to aspects of behaviour and cognition, connecting genetically-identified cells with function.
What is serial two-photon tomography?
STP tomography generates high-resolution datasets that are free of distortions and can be readily warped in three dimensions, for example, for comparing multiple anatomical tracings. This method opens the door to routine systematic studies of neuroanatomy in mouse models of human brain disorders.
What are the 2 main advantages of 2 photon microscopy over confocal microscopy?
The principal advantages of two-photon microscopy are reduced phototoxicity, increased imaging depth, and the ability to initiate highly localized photochemistry in thick samples.
What is the resolution of two-photon microscopy?
STED microscopy has been done with two-photon excitation and has achieved a spatial resolution of ~60 nm in optical systems with two lasers [13–15] and a single laser [16,17]. However, the imaging depth of two-photon STED microscopy is still limited to being less than ~100 µm.
What is neuronal calcium imaging?
Calcium imaging is a microscopy technique to optically measure the calcium (Ca2+) status of an isolated cell, tissue or medium. Calcium imaging takes advantage of calcium indicators, fluorescent molecules that respond to the binding of Ca2+ ions by fluorescence properties.
How does two-photon excitation microscopy work?
When using two-photon microscopy, two or three photons of a higher wavelength do the work of one: When they hit the fluorophore at the very same time (typically within several femtoseconds), they are absorbed, resulting in fluorophore excitation and emission of light.
What molecule does GCaMP detect?
It is used in biological research to measure intracellular Ca2+ levels both in vitro and in vivo using virally transfected or transgenic cell and animal lines.
Is GCaMP a protein?
GCaMP, originally developed by Junichi Nakai is an example of a GECI. It is a fusion of circularly permutated green fluorescent protein (GFP), calmodulin (CaM) and M13, a peptide sequence from myosin light chain kinase.
How is Fura-2 used?
One of the most common calcium indicators is Fura-2, which has an emission peak at 505 nM and changes its excitation peak from 340 nm to 380 nm in response to calcium binding. Here we describe the use of Fura-2 to measure intracellular calcium elevations in neurons and other excitable cells.