Difference between revisions of "Main Page"
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<center><big> '''Welcome to the Leschziner Lab's Tutorials Wiki''' </big></center> | <center><big> '''Welcome to the Leschziner Lab's Tutorials Wiki''' </big></center> | ||
| − | In these pages you will find tutorials designed to explain, in an accessible way, some of the principles behind the techniques used in our lab. They range from the very general (How does a microscope work?) to very specific approaches used in Three-Dimensional Electron Microscopy. This wiki is, by definition, a "work in progress"; we will periodically add new material and update what's already here. <span style="color:#14a;">Blue</span> links are for tutorials already available while <span style="color:#ff0000">red</span> ones are for those we are still developing. | + | In these pages you will find tutorials designed to explain, in an accessible way, some of the principles behind the techniques used in our lab. They range from the very general (How does a microscope work?) to very specific approaches used in Three-Dimensional Electron Microscopy (3D-EM). This wiki is, by definition, a "work in progress"; we will periodically add new material and update what's already here. <span style="color:#14a;">Blue</span> links are for tutorials already available while <span style="color:#ff0000">red</span> ones are for those we are still developing. |
We hope you find the material useful and welcome feedback on how to improve it. To give us feedback, please see the [[Talk:Main_Page|discussion tab]] at the top of the page, or [mailto:leschziner.tutorials@gmail.com e-mail us]. | We hope you find the material useful and welcome feedback on how to improve it. To give us feedback, please see the [[Talk:Main_Page|discussion tab]] at the top of the page, or [mailto:leschziner.tutorials@gmail.com e-mail us]. | ||
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| + | ==Introduction== | ||
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| + | In the Leschziner Lab, we use electron microscopy to study structures of macromolecules. In particular, we look at single particles and use the techniques described in the sections below to generate three-dimensional structures of the proteins or protein complexes of interest. | ||
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| + | In addition to the study of protein structure, our lab is interested in improving techniques for 3D-EM. There exists a bottleneck in structure determination using 3D-EM in the generation of initial models upon which to refine structures. It is a goal of the lab to remove the bottleneck in generating initial models of macromolecules, helping to make the entire reconstruction process faster and more robust. | ||
==General imaging principles== | ==General imaging principles== | ||
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==Resolution== | ==Resolution== | ||
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| + | The concept of resolution in electron microscopy has brought out several debates in the past. | ||
==Hardware Innovations to the Electron Microscope== | ==Hardware Innovations to the Electron Microscope== | ||
Revision as of 16:42, 7 May 2010
In these pages you will find tutorials designed to explain, in an accessible way, some of the principles behind the techniques used in our lab. They range from the very general (How does a microscope work?) to very specific approaches used in Three-Dimensional Electron Microscopy (3D-EM). This wiki is, by definition, a "work in progress"; we will periodically add new material and update what's already here. Blue links are for tutorials already available while red ones are for those we are still developing.
We hope you find the material useful and welcome feedback on how to improve it. To give us feedback, please see the discussion tab at the top of the page, or e-mail us.
Contents
Introduction
In the Leschziner Lab, we use electron microscopy to study structures of macromolecules. In particular, we look at single particles and use the techniques described in the sections below to generate three-dimensional structures of the proteins or protein complexes of interest.
In addition to the study of protein structure, our lab is interested in improving techniques for 3D-EM. There exists a bottleneck in structure determination using 3D-EM in the generation of initial models upon which to refine structures. It is a goal of the lab to remove the bottleneck in generating initial models of macromolecules, helping to make the entire reconstruction process faster and more robust.
General imaging principles
These conventions and basic physics concepts are fundamental tools for understanding electron imaging.
Electron imaging
There are many caveats to imaging with electrons as opposed to photons.
- What is an Electron Microscope?
- History of the Electron Microscope
- Types of Signals
- Electron optics
- The Weak-Phase Object Approximation
- Contrast
- Ewald Sphere
- Aberrations
- Special Imaging Techniques
Electron Microscopy of Macromolecules
Two-Dimensional Averaging
Three-dimensional reconstruction by EM
A "30 Second Overview" of three-dimensional EM reconstruction.
Basics
Existing Reconstruction Methods
- Angular Reconstitution (AR)
- Random Conical Tilt (RCT)
- Orthogonal Tilt Reconstruction (OTR)
Software Available
An overview of the currently available software, links, and general descriptions.
Resolution
The concept of resolution in electron microscopy has brought out several debates in the past.
Hardware Innovations to the Electron Microscope
Some new, some old, there are many aspects of the microscope that may be changed, ostensibly altering the physics of image formation for the better.
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