A single degree Celsius equals 1.8 degrees Fahrenheit.

The study also demonstrates that synthetic aperture radar (SAR) can automatically and consistently monitor glaciers and their snowlines throughout the year. Traditionally, snowlines are usually measured only near the end of the melt season using optical instruments.

Researchers found that SAR provides more dependable data than conventional surface-based optical methods.

The findings were published in Nature.

The study was led by Albin Wells, a recent Ph.D. graduate from Carnegie Mellon University. Co-authors include Carnegie Mellon assistant professor David Rounce and Mark Fahnestock of the University of Alaska Fairbanks Geophysical Institute. Rounce previously worked at the Geophysical Institute as a postdoctoral fellow and research associate.

Tracking Glacier Melt From Space

The research team used radar observations to measure glacier “melt days.” A melt day may represent a full 24-hour period when an entire glacier is melting, or it can consist of several days during which melting occurs across different portions of the glacier until the total affected area equals the glacier’s full surface.

An increase in melt days indicates that the melt season is becoming longer, which contributes to greater overall ice loss.

Using data from Europe’s Sentinel-1 radar satellites, the scientists monitored seasonal changes on nearly every Alaska glacier larger than about half a square mile between mid-2016 and 2024.

Synthetic aperture radar operates by transmitting microwave pulses from a moving satellite or aircraft toward Earth’s surface and then combining the returning signals into detailed images. Because it does not rely on sunlight, SAR can collect data through clouds and in darkness.

Sentinel-1 revisits the same location every 12 days and covers more than 3,000 glaciers across Alaska.

Heat Waves Accelerate Snow Loss

The researchers also discovered that short-term heat waves can dramatically reduce the snow cover that protects glaciers. During unusually warm periods, glaciers lost up to 28% more protective snow than they do in typical years. This percentage applies at the scale of individual mountain ranges and does not necessarily affect every glacier equally within those regions.

“Our ability to quantify these changes is really important,” Wells said. “Melt extents and snowlines are proxies for glacier mass balance.”

Glacier mass balance refers to the difference between how much snow and ice a glacier gains and how much it loses over time.

“These correlations with temperature begin to give a sense for how much melt or snowline retreat we can anticipate under future, warmer climates across the region,” Wells said.

A snowline marks the boundary between a glacier’s accumulation zone, where snow builds up and adds mass, and its ablation zone, where melting removes snow and ice.

Why Radar Outperforms Optical Monitoring

Glaciologists generally rely on optical instruments to evaluate snowlines near the end of the melt season, usually in late summer or early autumn.

“In optical data, the snowline can be really hard to observe,” Fahnestock said. “If you’re a day late taking your picture, it might have snowed on the entire glacier, and you can’t see where the bare glacier ice is down below and where the snow and firn is above.”

Firn is partially compacted granular snow found near the upper portions of glaciers. Over time, it can gradually transform into glacier ice.

According to Fahnestock, optical observations can be affected by changing lighting conditions, shadows, cloud cover, and variations in whether firn appears clean or dirty.

SAR avoids many of those limitations and can provide regular snowline measurements throughout the melt season.

“What Albin has done is operationalize the tracking of surface conditions on the glaciers in a way that can be applied anywhere,” Fahnestock said.

The 2019 Alaska Heat Wave

The researchers closely examined an intense Alaska heat wave that lasted from June 23-July 10, 2019. The event affected every glaciated region of the state except the Brooks Range.

For nearly two weeks, temperatures at many locations ran 20 to 30 degrees above average. Several all-time records were broken, including a reading of 90 degrees Fahrenheit at Ted Stevens Anchorage International Airport. Typical summer highs in Anchorage are usually in the mid-60s.

According to the study, the extreme heat pushed glacier snowlines nearly 350 feet higher in elevation. In an average year, snowlines would not reach those elevations until roughly two months later.

As a result, bare ice and firn remained exposed for longer periods, increasing overall ice loss.

The authors write that this highlights “the sensitivity of glaciers to short-term climatic variability.”

Coastal and Inland Glaciers Behave Differently

The study also identified consistent differences between glaciers located on the coastal side of mountain ranges and those farther inland.

Wells said the number of melt days varied between the two groups, suggesting they respond differently to environmental conditions even though many are losing ice at broadly similar rates.

“This is an important finding,” Wells said, “because it corroborates prior knowledge that glaciers in Alaska on the coastal side of mountains have more melt in summer and more accumulation in winter than those on the continental side of the ranges.”

Many industrial activities depend on separating different substances from one another. These separation processes are essential for tasks such as drug purification, textile dye treatment, and food production. Yet they are also among the most energy-intensive operations in manufacturing, accounting for roughly 40% to 50% of global industrial energy consumption.

Most facilities still rely on traditional approaches such as distillation and evaporation. While effective, these methods require large amounts of energy and contribute significantly to carbon emissions. Membrane-based filtration is generally considered a cleaner alternative, but conventional polymer membranes often contain pores of uneven size. Over time, those pores can change shape or degrade, reducing performance and limiting their usefulness in demanding industrial environments.

Nature-Inspired POMbranes With One-Nanometer Pores

“To address these limitations, we engineered a new class of ultra-selective, crystalline membranes called “POMbranes,” which contain pores that are about one nanometer wide, thousands of times thinner than a human hair,” said Dr. Shilpi Kushwaha, Senior Scientist at CSMCRI.

The new membranes draw inspiration from biological systems such as aquaporins, which regulate the movement of molecules through precisely sized channels. To achieve this level of control, the researchers used polyoxometalate (POM) clusters. Each cluster contains a naturally occurring opening that is exactly 1 nanometer wide and remains permanently stable.

According to Ms Priyanka Dobariya, a CSMCRI research scholar and co-first author of the article, “These POMs are tiny, crown-shaped metal clusters that have a permanent, perfect hole in their centre that does not change or lose shape, which is the biggest hurdle with traditional plastic filters.”

Building an Ultrathin Molecular Sieve

Creating a practical membrane required arranging billions of these tiny ring-like structures into a continuous, defect-free layer. To accomplish this, the researchers attached flexible chemical chains to the POM clusters.

When the modified clusters were placed on water, they naturally spread out and organized themselves into a large-area ultrathin film. By changing the length of the attached chains, the team was able to control how closely the clusters packed together.

“This forced molecules to cross the membrane through the only open path, the one-nanometer holes built into each cluster, allowing the membrane to act like a high-tech sieve,” added Dr. Raghavan Ranganathan, Associate Professor at IITGN’s Department of Materials Engineering.

Dr. Ranganathan and Mr. Vinay Thakur, a PhD scholar at IITGN and the co-first author of the article, also carried out molecular-level simulations that revealed how the membranes perform their filtering function.

Nearly Ten Times Better Separation Performance

Testing showed that the membranes could distinguish between molecules that differ by only 100-200 Daltons, a level of precision that is extremely difficult to achieve with conventional polymer membranes.

According to Dr. Ketan Patel, Principal Scientist at CSMCRI, this capability could create new opportunities for more sustainable manufacturing processes.

“Our membranes show almost ten times better separation performance compared to existing technologies, while remaining flexible, stable, and scalable,” he said.

“Additionally, these membranes are flexible, stable across different acidity levels (pH ranges), and can be manufactured in large sheets. This combination is essential if the membranes are to be adopted widely in industry.”

Potential Benefits for Textiles and Water Recycling

The technology could be particularly valuable for India’s textile and pharmaceutical industries, both of which play major roles in the country’s economy.

India’s textile and apparel sector contributes more than 2.3% of GDP and represents approximately 13% of industrial production. The domestic market is currently valued at $160-225 billion and is expected to expand to $250-350 billion by 2030.

Textile dyeing and finishing operations generate large amounts of contaminated wastewater, making dye removal and water reuse ongoing challenges. The new membranes could selectively remove dye molecules while allowing water to be recycled, reducing both freshwater demand and chemical waste. This advantage is especially important as India’s wastewater treatment market continues to grow.

Applications in Pharmaceutical Manufacturing

The membranes could also benefit pharmaceutical production, where highly accurate separations are critical for product quality and manufacturing efficiency.

“Processes like drug purification and solvent recovery are both energy-intensive and quality-sensitive,” noted Mr. Vinay Thakur. “Highly selective membranes such as these can lower energy use while maintaining the stringent standards required in pharmaceutical production.”

A Platform Technology for Sustainable Manufacturing

Researchers describe the new POMbranes as a versatile platform technology. Their adjustable structure, high selectivity, and ability to withstand harsh chemical environments make them suitable for a broad range of industrial separation tasks, from wastewater treatment to advanced chemical manufacturing.

As industries increasingly look for technologies that combine efficiency, durability, and sustainability, molecularly engineered membranes may become an important part of next-generation manufacturing systems. By applying a principle commonly found in biology, precise control at the molecular scale, and adapting it into a scalable materials technology, the researchers have demonstrated how nature-inspired design can help solve major industrial challenges.

The research was led by Christopher Walsh, MD, PhD, Chief of the Division of Genetics and Genomics at Boston Children’s Hospital and an Investigator of the Howard Hughes Medical Institute. Collaborators included Alice Eunjung Lee, PhD, and August Yue Huang, PhD, also of the Division of Genetics and Genomics. All three are Professors at Harvard Medical School and Associate Members of the Broad Institute of MIT and Harvard.

The team says the findings could point to new ways to diagnose and treat Alzheimer’s disease.

“We find that to some extent, Alzheimer’s disease is a little like cancer — driven by the same mutations that drive blood cancers like lymphoma and leukemia,” said Walsh. “This is helpful because we have a lot of drugs to fight cancer and some of them might be useful therapeutically for Alzheimer’s disease.”

Cancer Driver Mutations Found in Alzheimer’s Brains

To investigate, researchers analyzed 149 cancer-driving genes in brain tissue samples from 190 people with Alzheimer’s disease and compared them with samples from 121 healthy brains.

The Alzheimer’s samples contained more single-letter DNA changes than the healthy tissue. Many of these alterations repeatedly appeared in the same five cancer driver genes, suggesting that microglia were accumulating mutations in a specific set of genes.

Microglia serve as the brain’s cleanup crew. These cells remove debris and help eliminate infected, damaged, or dying cells. Scientists had long believed that microglia remain confined to the brain and do not cross the blood brain barrier, unlike many other immune cells that circulate through the bloodstream.

Unexpected Link Between Blood Cells and the Brain

The mutations identified in microglia are commonly associated with blood cancers. That observation prompted the researchers to look for the same mutations in blood samples from people with Alzheimer’s disease.

They did not expect to find them.

Instead, the blood cells from the same Alzheimer’s patients carried the identical cancer-associated mutations.

“It was actually a really unexpected finding that suggests a totally new mechanism for Alzheimer’s disease pathogenesis,” said Huang. “The findings mean that the blood’s immune cells with cancer mutations are likely getting into the brain and contributing to disease.”

How Mutant Immune Cells May Fuel Alzheimer’s

The researchers propose that aging or injury can weaken the blood-brain barrier, allowing immune cells from the bloodstream to enter the brain. Once there, these cells may transform into microglia-like cells.

At the same time, protein clumps that build up in the brain trigger microglia to multiply and respond. Cells that possess a biological advantage are more likely to expand, including the microglia-like cells carrying cancer-related mutations.

According to the researchers, these mutated cells may create a more inflammatory and damaging environment than healthy microglia. As a result, nearby neurons can be harmed and die, contributing to the progression of Alzheimer’s disease.

Potential for New Alzheimer’s Tests and Treatments

The discovery could eventually lead to new approaches for detecting Alzheimer’s risk.

“Because it’s hard to access brain tissue in a living patient, genetic screens using blood samples could be developed to test whether a person carries these mutations, and has an increased risk of developing Alzheimer’s disease,” said Lee.

In a follow-up study posted as a preprint on bioRxiv, Huang and Lee found additional evidence supporting the connection. Their analysis showed that cancer driver mutations detected in blood samples increased Alzheimer’s disease risk independently of APOE4, a well-established genetic risk factor for the disease.

The research was conducted in collaboration with the Icahn School of Medicine at Mount Sinai. Funding was provided by the Howard Hughes Medical Institute, the National Institute on Aging, the NIH Common Fund through the Somatic Mosaicism Across Human Tissues (SMaHT) consortium, and the Suh Kyungbae Foundation (SUHF).

The benefits were even greater when strength training was combined with aerobic exercise. However, researchers found no additional advantage from doing more than 120 minutes of strength training per week. That level of exercise was linked to a 19% lower risk of death from cardiovascular disease and a 27% lower risk of death from neurological disease.

Strength Training and Long-Term Health

While the life-extending benefits of aerobic exercise are well established, the impact of muscle-strengthening activities on overall mortality and specific causes of death has been less clear. Researchers wanted to determine whether strength training alone, or combined with aerobic exercise, could influence those risks.

To investigate, they analyzed data collected over three decades from three major studies: the Health Professionals Follow-up Study (1992-2022), the Nurses’ Health Study (2002-21), and the Nurses’ Health Study II (2003-21). Together, the studies included 147,374 participants (31,540 men and 115,834 women).

Every two years, participants reported how much time they spent each week doing strength training and aerobic exercise. Aerobic activities included brisk walking, running, jogging, swimming, cycling, tennis, squash, strenuous outdoor work, and stair climbing. Strength training included exercises using weights or body weight, such as press ups, squats, and lunges.

At the start of the study, participants were an average of 54 years old. Those who reported higher levels of strength training were generally younger, weighed less, followed healthier lifestyles, and engaged in more aerobic activity than those who did no strength training.

What the Researchers Found

About three quarters (74%) of participants exceeded the recommended 150 minutes of moderate intensity aerobic exercise per week, equivalent to 7.5 MET hours over the long term. METs measure how many calories are burned during physical activity compared with resting.

Nearly half (46%) of participants reported doing some form of strength training.

Over the 30-year follow-up period, 35,798 participants died. Researchers found that higher long-term levels of weekly strength training were associated with a lower risk of death.

After accounting for other factors that could affect the results, participants who performed 90-119 minutes of strength training per week had a 13% lower risk of death from any cause. No additional reduction in risk was observed above 120 minutes per week.

That same 90-119 minute range was also associated with a 19% lower risk of death from cardiovascular disease and a 27% lower risk of death from neurological disease.

Cancer-related benefits appeared at lower amounts of strength training. Participants who performed 1-29 minutes per week had a 21% lower risk of cancer death, while those doing 30-59 minutes per week had an 18% lower risk.

The Power of Combining Cardio and Strength Training

Compared with people who did less than 7.5 MET hours of aerobic activity per week and no strength training, participants who performed strength training alone for 1-59 minutes or 60-119 minutes per week had a 7-11% lower risk of death.

Aerobic exercise on its own also showed strong benefits. Any amount above 7.5 MET hours per week was associated with a 26-43% lower risk of death.

The lowest mortality risk was seen among people who combined high levels of aerobic exercise with strength training. Those who accumulated 30-44 MET hours of aerobic activity per week and 60-119 minutes of strength training had a 45% lower risk of death.

Even greater reductions were observed among participants who performed 45+ MET hours of aerobic activity per week. In that group, the risk of death was 53% to 58% lower regardless of how much strength training they did.

Important Limitations

The researchers emphasized that this was an observational study, meaning it cannot prove that strength training directly caused the reductions in mortality risk.

They also noted several limitations. Exercise habits were self reported, which can introduce inaccuracies. The analysis did not include certain forms of strength training, such as calisthenics and Pilates. In addition, information was not available on the duration of individual workouts or the intensity of strength training sessions, factors that could have influenced the results.

Despite those limitations, the researchers concluded:

“Our findings on different dose-response relationships between long-term resistance training with all-cause and cause-specific mortality suggest that different amounts of resistance training may be needed to optimize benefits across outcomes.

“The observed pattern that adding resistance training further reduced mortality risk across all levels of aerobic activity up to 45 MET hours/week supports current recommendations encouraging both types of activity to maximize mortality benefits.”