Introduction

Electron microscopes are powerful tools that allow scientists to see objects at the nanoscale. However, traditional electron microscopes produce black and white images, which can make it difficult to distinguish between different cellular structures.

Researchers at the University of California, San Diego, have developed a new technique that adds artificial color to electron microscope images. This technique could help scientists better understand the structures and functions within cells.

How the Technique Works

The new technique combines light microscopy and electron microscopy. First, scientists use a light microscope to identify the structures they want to highlight. Then, they introduce a small amount of rare earth metal to the structures.

Next, they subject the sample to an electron microscope. The electron microscope fires electrons at the tissue. Some electrons go right through, while others hit thicker or heavier materials and bounce back.

A few electrons strike the rare earth metal and displace an electron there. This causes the displaced electron to fly out, along with a little bit of energy. The energy is distinct to the particular metal used, and this is what the microscope measures. This technique is called electron energy loss spectroscopy.

Applications of the Technique

Scientists have used the new technique to image cell structures like the Golgi complex, proteins on the plasma membrane, and even proteins at the synapses in the brain.

The technique could be used to study a wide range of biological processes, including:

• The localization of proteins within cells
• The interactions between different cellular structures
• The development and progression of diseases

Benefits of the Technique

The new technique offers several benefits over traditional electron microscopy:

• Color images: The technique adds artificial color to electron microscope images, which makes it easier to distinguish between different cellular structures.
• High resolution: The technique provides high-resolution images, which allows scientists to see objects at the nanoscale.
• Versatility: The technique can be used to image a wide range of biological samples.

Comparison to Other Techniques

There are other techniques that can be used to provide color imagery from electron microscopes. However, these techniques have their own limitations.

• Correlative light electron microscopy: This technique requires two different images, from different microscopes, which can reduce precision.
• Immunogold labeling: This technique can give unclear staining.

The Legacy of Roger Tsien

The paper describing the new technique was the last to bear the name of Roger Tsien, a Nobel prize-winning chemist who died in August. Tsien was best known for using a fluorescent protein from jellyfish to illuminate cellular structures.

The new technique is a testament to Tsien’s legacy of innovation in microscopy. It is a powerful tool that could help scientists better understand the world at the nanoscale.

Conclusion

The new technique for adding artificial color to electron microscope images is a significant advance in microscopy. It could help scientists better understand the structures and functions within cells, and could lead to new insights into a wide range of biological processes.

What is Virtual Nanoscopy?

Virtual nanoscopy is a new technology that allows scientists to create zoom-able images of biological tissue at the cellular level. It combines thousands of individual electron microscope images to create a coherent and interactive whole. This allows viewers to explore the structure of tissue in unprecedented detail, from a tissue-level view down to the interior of individual cells.

How Does Virtual Nanoscopy Work?

Virtual nanoscopy begins with collecting thousands of slightly overlapping images using an electron microscope. These images are then stitched together using an automated software program. The program uses metadata on the individual images’ orientation and an algorithm that compares similar features in each image to determine exactly where they should be placed.

The resulting image is a massive file that can be zoomed in and out to reveal different levels of detail. For example, the zebrafish embryo image shown in the article is composed of more than 26,000 individual images and weighs in at a total of 281 gigapixels. This allows viewers to move from a zoomed-out picture of the whole embryo to a detailed view of structures, such as a nucleus, within a specific cell.

Benefits of Virtual Nanoscopy

Virtual nanoscopy offers several benefits over traditional electron microscopy. First, it allows scientists to create a complete, 3D view of a tissue sample. This is in contrast to traditional electron microscopy, which can only capture 2D images of small areas of tissue.

Second, virtual nanoscopy allows scientists to explore tissue samples in a non-destructive way. Traditional electron microscopy requires that samples be preserved in a way that can damage their structure. Virtual nanoscopy, on the other hand, does not require any sample preparation, so it can be used to study live tissue.

Third, virtual nanoscopy is much faster than traditional electron microscopy. It can take hours or even days to collect and process a single electron microscope image. Virtual nanoscopy, on the other hand, can be used to create a complete, 3D image of a tissue sample in a matter of minutes.

Applications of Virtual Nanoscopy

Virtual nanoscopy has a wide range of applications in biological research. It can be used to study the structure of cells, tissues, and organs. It can also be used to track the development of embryos and to investigate the effects of drugs and toxins on cells.

In the article, the researchers used virtual nanoscopy to analyze the zebrafish embryo, human skin tissue, a mouse embryo, and mouse kidney cells. They found that virtual nanoscopy can be used to identify new structures in cells and to track the movement of cells over time.

Conclusion

Virtual nanoscopy is a powerful new tool that is revolutionizing the way scientists study biological tissue. It offers several advantages over traditional electron microscopy, including the ability to create complete, 3D images of tissue samples, to explore tissue samples in a non-destructive way, and to do so much faster than traditional electron microscopy. As a result, virtual nanoscopy is expected to play a major role in biological research in the years to come.