ZME Science
No Result
View All Result
ZME Science
No Result
View All Result
ZME Science

Home → Science → Biology

Expanding Brain Samples to Better See Them

Researchers from the Massachusetts Institute of Technology (MIT) have found a way to enlarge and map brain samples. This inexpensive technique will now allow scientists to get a much closer look at the human brian and perhaps figure out some of its long standing secrets.

Mihai AndreibyMihai Andrei
January 19, 2015 - Updated on January 20, 2015
in Biology, News
A A
Share on FacebookShare on TwitterSubmit to Reddit

Researchers from the Massachusetts Institute of Technology (MIT) have found a way to enlarge and map brain samples. This inexpensive technique will now allow scientists to get a much closer look at the human brian and perhaps figure out some of its long standing secrets.

Using a new technique that allows them to enlarge brain tissue, MIT scientists created these images of neurons in the hippocampus.
Image: Fei Chen and Paul Tillberg

Ever since the 1500s when microscopes were first developed, people have wanted to zoom in more and more. But scientists working at MIT decided to take a different approach, and instead of zooming in with the microscope, they simply made the samples bigger. Of course, that’s nowhere near as easy as it sounds. They did this by embedding samples in a polymer that swells when water is added. This allows specimens to be physically magnified, and therefore imaged at a much higher resolution.

What makes this technique even more interesting is the fact that it uses relatively cheap materials. The chemicals and materials required are commonly available everywhere.

“Instead of acquiring a new microscope to take images with nanoscale resolution, you can take the images on a regular microscope. You physically make the sample bigger, rather than trying to magnify the rays of light that are emitted by the sample,” says Ed Boyden, an associate professor of biological engineering and brain and cognitive sciences at MIT.


The thing is, with conventional microscopes, there is a physical limit to how much you can magnify. Microscopes use lenses to focus light emitted from a sample into a magnified image. However, when you get to things which are comparable in size to the wavelength of light, things start to get tricky – and you actually can’t magnify things smaller than that wavelength. When scientists do want to image at this level, they use electron microscopes. This is a big problem.

“Unfortunately, in biology that’s right where things get interesting,” says Boyden, who is a member of MIT’s Media Lab and McGovern Institute for Brain Research. Protein complexes, molecules that transport payloads in and out of cells, and other cellular activities are all organized at the nanoscale.

Scientists have tried several approaches to get past this limit, but this is the first time the sample was focused, instead of the microscopy technique. The idea is to embed samples in an expandable polymer gel made of polyacrylate, a very absorbent material found in many common products, such as diapers.

“Once the tissue is labeled, the researchers add the precursor to the polyacrylate gel and heat it to form the gel. They then digest the proteins that hold the specimen together, allowing it to expand uniformly. The specimen is then washed in salt-free water to induce a 100-fold expansion in volume. Even though the proteins have been broken apart, the original location of each fluorescent label stays the same relative to the overall structure of the tissue because it is anchored to the polyacrylate gel”, MIT’s press room writes.

In a different study, MIT neuroscientists used calcium imaging to label these pyramidal cells in the brain. Image: Qian Chen

Using this technique, researchers managed to image a section of brain tissue 500 by 200 by 100 microns with a standard confocal microscope. Imaging such large samples would not be feasible with other super-resolution techniques, which require minutes to image a tissue slice only 1 micron thick. The resolution wasn’t diminished in any way either, which makes it even more spectacular.

“The exciting part is that this approach can acquire data at the same high speed per pixel as conventional microscopy, contrary to most other methods that beat the diffraction limit for microscopy, which can be 1,000 times slower per pixel,” says George Church, a professor of genetics at Harvard Medical School who was not part of the research team.

According to their study, this is the only way to truly analyze such samples.

RelatedPosts

What side do cats prefer to sleep on? The left side, and there’s a good reason for that
The cerebellum is much more ‘brainy’ than we thought
Never skip leg day: study finds hind leg inactivity causes neurological problems in mice
Robot see, robot do: MIT software allows you to instruct a robot without having to code

“The other methods currently have better resolution, but are harder to use, or slower,” Tillberg says. “The benefits of our method are the ease of use and, more importantly, compatibility with large volumes, which is challenging with existing technologies.”

Source: MIT.

 

Tags: Biologybrainmitpolymer

ShareTweetShare
Mihai Andrei

Mihai Andrei

Dr. Andrei Mihai is a geophysicist and founder of ZME Science. He has a Ph.D. in geophysics and archaeology and has completed courses from prestigious universities (with programs ranging from climate and astronomy to chemistry and geology). He is passionate about making research more accessible to everyone and communicating news and features to a broad audience.

Related Posts

Home science

What side do cats prefer to sleep on? The left side, and there’s a good reason for that

byMihai Andrei
3 days ago
Close-up photo of a tiny wasp.
Animals

Wasp Mums Keep Remarkable Mental To-Do List For Multiple Nests Despite Tiny Brain

byRupendra Brahambhatt
4 days ago
Biology

AI Could Help You Build a Virus. OpenAI Knows It — and It’s Worried

byMihai Andrei
6 days ago
Mind & Brain

Your Brain Uses Only 5% More Energy Whether You’re Actively Thinking or Not. So, What Causes Mental Fatigue?

byTibi Puiu
3 weeks ago

Recent news

What’s Seasonal Body Image Dissatisfaction and How Not to Fall into Its Trap

June 28, 2025

Why a 20-Minute Nap Could Be Key to Unlocking ‘Eureka!’ Moments Like Salvador Dalí

June 28, 2025

The world’s oldest boomerang is even older than we thought, but it’s not Australian

June 27, 2025
  • About
  • Advertise
  • Editorial Policy
  • Privacy Policy and Terms of Use
  • How we review products
  • Contact

© 2007-2025 ZME Science - Not exactly rocket science. All Rights Reserved.

No Result
View All Result
  • Science News
  • Environment
  • Health
  • Space
  • Future
  • Features
    • Natural Sciences
    • Physics
      • Matter and Energy
      • Quantum Mechanics
      • Thermodynamics
    • Chemistry
      • Periodic Table
      • Applied Chemistry
      • Materials
      • Physical Chemistry
    • Biology
      • Anatomy
      • Biochemistry
      • Ecology
      • Genetics
      • Microbiology
      • Plants and Fungi
    • Geology and Paleontology
      • Planet Earth
      • Earth Dynamics
      • Rocks and Minerals
      • Volcanoes
      • Dinosaurs
      • Fossils
    • Animals
      • Mammals
      • Birds
      • Fish
      • Amphibians
      • Reptiles
      • Invertebrates
      • Pets
      • Conservation
      • Animal facts
    • Climate and Weather
      • Climate change
      • Weather and atmosphere
    • Health
      • Drugs
      • Diseases and Conditions
      • Human Body
      • Mind and Brain
      • Food and Nutrition
      • Wellness
    • History and Humanities
      • Anthropology
      • Archaeology
      • History
      • Economics
      • People
      • Sociology
    • Space & Astronomy
      • The Solar System
      • Sun
      • The Moon
      • Planets
      • Asteroids, meteors & comets
      • Astronomy
      • Astrophysics
      • Cosmology
      • Exoplanets & Alien Life
      • Spaceflight and Exploration
    • Technology
      • Computer Science & IT
      • Engineering
      • Inventions
      • Sustainability
      • Renewable Energy
      • Green Living
    • Culture
    • Resources
  • Videos
  • Reviews
  • About Us
    • About
    • The Team
    • Advertise
    • Contribute
    • Editorial policy
    • Privacy Policy
    • Contact

© 2007-2025 ZME Science - Not exactly rocket science. All Rights Reserved.