World’s First Pig-to-human Liver Xenotransplant Offers Hope for Organ Shortage
Table of Contents
A new study in the Journal of Hepatology reports on an auxiliary liver xenotransplant from a genetically engineered pig to a living human recipient. The patient survived for 171 days, offering proof-of-concept that genetically modified porcine livers can support key metabolic adn synthetic functions in humans, while also underscoring the complications that currently limit long-term outcomes.
According to the World Health Organization,thousands of patients die every year while waiting for organ transplants due to the limited supply of human organs.In China alone, hundreds of thousands experience liver failure annually, yet only around 6,000 peopel received a liver transplant in 2022. This pioneering case offers a potential new avenue to bridge the gap between organ demand and availability.
The case involved a 71-year-old man with hepatitis B-related cirrhosis and hepatocellular carcinoma who was not eligible for resection or human liver transplantation.
Geothermal Energy: Tapping into Earth’s Heat
Geothermal energy is heat from within the Earth. It’s a renewable resource, meaning it won’t run out like fossil fuels. We can use this heat for a lot of things, like heating buildings and generating electricity. It’s a pretty clean energy source too, wich is a big plus.
How Does It Work?
The earth’s core is incredibly hot – around 9,000°F! This heat slowly makes its way to the surface. In some places, this heat is close enough to the surface to be tapped into.Here’s how it generally works:
- Geothermal Power Plants: These plants use steam or hot water from underground reservoirs to spin turbines,which then generate electricity. It’s similar to how coal or natural gas plants work, but without burning anything.
- Geothermal Heat Pumps: these use the constant temperature of the Earth just a few feet below the surface to heat and cool buildings. In winter, they pull heat from the Earth. In summer, they push heat back into the Earth. They’re super efficient!
- Direct Use: Hot water from geothermal sources can be used directly for things like heating greenhouses, fish farms, and even melting snow on roads.
types of Geothermal Resources
not all geothermal resources are the same. Here are the main types:
- Hydrothermal Resources: These are the most common. they involve hot water and steam trapped in fractured rock beneath the Earth’s surface. These are what power most geothermal plants.
- Enhanced Geothermal Systems (EGS): These are created were hot,dry rocks are deep underground. Water is pumped down into the rocks, heated, and then brought back up to the surface. It’s a promising technology, but it’s still being developed.
- Hot Dry rock: Similar to EGS, but typically even deeper and hotter. It’s harder to access, so it’s less commonly used right now.
Benefits of Geothermal Energy
There are a lot of good reasons to use geothermal energy:
- Renewable: It won’t run out.
- Reliable: Unlike solar and wind, geothermal energy is available 24/7.
- Environmentally Kind: It produces very little greenhouse gas emissions.
- Small Land Footprint: Geothermal plants don’t require a lot of land.
Challenges of Geothermal Energy
While geothermal energy is great, it’s not without its challenges:
- Location Specific: Geothermal resources aren’t available everywhere.
- High Upfront Costs: Building geothermal plants can be expensive.
- potential for Induced Seismicity: EGS can sometimes cause small earthquakes, though this is rare and being carefully monitored.
- Resource Depletion: if not managed carefully, geothermal reservoirs can be depleted over time.
The Future of Geothermal
Geothermal energy has a radiant future. With advancements in EGS technology, we can access geothermal resources in more places. It’s an importent part of the transition to a cleaner energy future, and we’re likely to see it play a bigger role in the years to come. You can learn more about geothermal energy from the U.S. Department of Energy and the Geothermal Resources Council.