DNA from discarded whale bones suggests loss of genetic diversity due to commercial whaling

Abandoned whaling stations on South Georgia Island
Photo Credit: Courtesy of Oregon State University

Commercial whaling in the 20th century decimated populations of large whales but also appears to have had a lasting impact on the genetic diversity of today’s surviving whales, new research from Oregon State University shows.

Researchers compared DNA from a collection of whale bones found on beaches near abandoned whaling stations on South Georgia Island in the south Atlantic Ocean to DNA from whales in the present-day population and found strong evidence of loss of maternal DNA lineages among blue and humpback whales.

“A maternal lineage is often associated with an animal’s cultural memories such as feeding and breeding locations that are passed from one generation to the next,” said the study’s lead author, Angela Sremba, who conducted the research as part of her doctoral studies at Oregon State University’s Marine Mammal Institute. “If a maternal lineage is lost, that knowledge is likely also lost.”

The findings were published recently in the Journal of Heredity.

Morphing robots designed at CSU can grip, climb and crawl like insects

Pulling inspiration from the natural world, researchers at Colorado State University have developed a trio of robots that can morph their bodies and legs as needed.

Video Credit: Colorado State University

Pulling inspiration from the natural world, researchers at Colorado State University have developed a trio of robots that can morph their bodies and legs as needed to better crawl, shimmy or swim over difficult terrain.  These new robotic systems are designed to mimic the way biological organisms adapt their shape depending on their life cycle or environment and were developed by a team from the Department of Mechanical Engineering. The work is described in a new paper published in Nature Communications which outlines the three robotic types and their different abilities including gripping, climbing and amphibious travel.

Associate Professor Jianguo Zhao led the research team on campus in the Department of Mechanical Engineering with recent Ph.D. graduate Jiefeng Sun serving as lead author for the paper. Zhao said these robots are made of materials that can become soft or rigid with changes in temperature and are able to move without the need for bulky power systems such as magnetic coils. That makes them more versatile and better equipped to potentially help humans search tight disaster areas for survivors in the future.

SwRI scientists use Webb, Sofia telescopes to observe metallic asteroid

Southwest Research Institute scientists are using telescopes to observe the Psyche asteroid in the infrared, providing context for the upcoming NASA spacecraft mission.
Illustration Credit: NASA/JPL-Caltech/ASU

Southwest Research Institute scientists are using telescopes to observe the asteroid Psyche in the infrared, providing context for NASA’s upcoming Psyche mission. Dr. Stephanie Jarmak is using the James Webb Space Telescope (JWST) to look for water signatures on the metallic surface of Psyche, while Dr. Anicia Arredondo is using some of the last data collected by the Stratospheric Observatory for Infrared Astronomy, or SOFIA, to study differences in Psyche’s composition at different points on its surface. 

At about 140 miles in diameter, Psyche is one of the most massive objects in the main asteroid belt orbiting between Mars and Jupiter. Previous observations indicate that Psyche is a dense, largely metallic object thought to be the leftover core from a failed planet. On October 5, NASA is scheduled to launch the Psyche spacecraft, which will travel 2.2 billion miles and arrive at the asteroid in August 2029.

“Using telescopes at different infrared wavelengths of light, the SwRI-led research will provide different but complementary information to what the Psyche spacecraft is designed to study,” said Dr. Tracy Becker, a group leader in SwRI’s Space Science Division.

Scientists Investigate Grand Canyon's Ancient Past to Predict Future Climate Impacts

The Grand Canyon is known as one of the Seven Natural Wonders of the World.
Photo Credit: Courtesy of Matthew Lachniet

The Grand Canyon’s valleys and millions of years of rock layers spanning Earth’s history have earned it a designation as one of the Seven Natural Wonders of the World. But, according to a new UNLV study, its marvels extend to vast cave systems that lie beneath the surface, which just might hold clues to better understand the future of climate change — by studying nature’s past.

A research team — led by UNLV paleoclimatologist and professor Matthew Lachniet — pulled an ancient stalagmite from the floor of an undisturbed Grand Canyon cave. By studying the mineral deposits’ geochemistry, they were able to analyze precipitation patterns during the rapidly warming period following the last Ice Age to improve understanding about the potential impact of future climate change on summer monsoon rains in the U.S. Southwest and northwestern Mexico.

‘Impossible’ Millimeter Wave Sensor Has Wide Potential

This prototype millimeter-wave radar sensor developed at UC Davis is capable of measuring extremely small vibrations and movements while being energy-efficient and cheap to produce.
Photo Credit: Omeed Momeni/University of California, Davis

Researchers at the University of California, Davis, have developed a proof-of-concept sensor that may usher in a new era for millimeter wave radars. In fact, they call its design a “mission impossible” made possible.

Millimeter wave radars send fast-moving electromagnetic waves to targets to analyze their movement, position and speed from the waves bounced back. The benefits of millimeter waves are their natural sensitivity to small-scale movements and their ability to focus on and sense data from microscopic objects.

The new sensor uses an innovative millimeter wave radar design to detect vibrations a thousand times smaller, and changes in a target’s position one hundred times smaller, than a strand of human hair, making it better or on par with the world’s most accurate sensors. Yet unlike its peers, this one is the size of a sesame seed, is cheap to produce and features a long battery life.

Professor Omeed Momeni and his lab in the Department of Electrical and Computer Engineering led the effort. It is part of an ongoing project funded by the Foundation for Food & Agriculture Research, or FFAR, to develop a low-cost sensor capable of tracking the water status of individual plants. This new radar is the necessary steppingstone that proves it is possible. The work is published in the September 2023 issue of IEEE Journal of Solid-State Circuits.

Discrimination alters brain-gut ‘crosstalk,’ prompting poor food choices and increased health risks

Illustration Credit: julientromeur

People frequently exposed to racial or ethnic discrimination may be more susceptible to obesity and related health risks in part because of a stress response that changes biological processes and how we process food cues. These are findings from UCLA researchers conducting what is believed to be the first study directly examining effects of discrimination on responses to different types of food as influenced by the brain-gut-microbiome (BGM) system.

The changes appear to increase activation in regions of the brain associated with reward and self-indulgence – like seeking “feel-good” sensations from “comfort foods” – while decreasing activity in areas involved in decision making and self-control.

“We examined complex relationships between self-reported discrimination exposure and poor food choices, and we can see these processes lead to increased cravings for unhealthy foods, especially sweet foods, but also manifested as alterations in the bidirectional communication between the brain and the gut microbiome,” said Arpana Gupta, PhD, a researcher and co-director of the UCLA Goodman-Luskin Microbiome Center and the UCLA G. Oppenheimer Center for Neurobiology of Stress and Resilience.

Climate and human land use both play roles in Pacific island wildfires past and present

SMU fire scientist Christopher Roos
Photo Credit: Courtesy of  Southern Methodist University

It’s long been understood that human settlement contributes to conditions that make Pacific Islands more susceptible to wildfires, such as the devastating Aug. 8 event that destroyed the Maui community of Lahaina. But a new study from SMU fire scientist Christopher Roos published in the journal Nature Ecology & Evolution shows that climate is an undervalued part of the equation.

Roos, SMU environmental archaeologist and professor of anthropology, traveled with his team to the Sigatoka River valley in southwestern Fiji in 2013, where they collected charcoal and stable carbon isotopes from deep soil cores to understand historic patterns of fire activity in the area. Different plants have distinct carbon isotopic signatures, which can provide information about past plant communities.

The team found fires and fire-created grassy areas that predate human settlement by millennia and actively corresponded to droughts likely driven by a regularly occurring weather pattern known as El Niño. El Niño events can alter precipitation patterns worldwide, making environmental conditions more favorable for wildfires. The National Oceanic and Atmospheric Administration issued an El Niño advisory in June, announcing the latest arrival of the climate event that continues to influence weather worldwide.

Genetics of Attraction: Mate Choice in Fruit Flies

The fruit fly Drosophila melanogaster is a common model organism for studying sexual selection and evolution.
Photo Credit: Stefan Lüpold, UZH

Genetic quality or genetic compatibility? What do female fruit flies prioritize when mating? Researchers at the University of Zurich show that both factors are important at different stages of the reproductive process and that females use targeted strategies to optimize the fitness of their offspring.

Breeding female fruit flies face a difficult decision: do they mate with the male that has the best genes, or with the one whose genes best match their own? Evolutionary biologists from the University of Zurich and Concordia University have now investigated this question, because, as UZH professor Stefan Lüpold explains, “the processes underlying mate choice influence the evolution of male sexual characteristics and thus the variation within a population – not only in flies”.

Heavily mutated SARS-CoV-2 variant BA.2.86 not as resistant to antibodies as first feared

Image Credit: Fusion Medical Animation

Researchers at Karolinska Institutet who studied SARS-CoV-2 variant BA.2.86, found that the new variant was not significantly more resistant to antibodies than several other variants that are circulating. The study also showed that antibody levels to BA.2.86 were significantly higher after a wave of XBB infections compared to before, suggesting that the vaccines based on XBB should provide some cross-protection to BA.2.86.

"We engineered a spike gene that matches that of the BA.2.86 variant and tested the blood of Stockholm blood donors (specifically those donations made very recently) to see how effective their antibodies are against this new variant. We found that although BA.2.86 was quite resistant to neutralizing antibodies, it wasn't significantly more resistant than a number of other variants that are also circulating", says Daniel Sheward, lead author of the study and Postdoctoral researcher in Benjamin Murrell's team at the Department of Microbiology, Tumor and Cell Biology at Karolinska Institutet.

Dense Measurement Network Links Air Pollution and Common Agricultural Practice

Photo Credit: Yiğit KARAALİOĞLU

A group of international collaborators led by the Research Institute for Humanity and Nature (RIHN) team performed the first quantitative study of air pollution in the northwestern region of India using 29 low-cost and reliable instruments. Their study demonstrated the benefits of source region observations to link crop residue burning (CRB) and air pollution at local to regional scales.

Exposure to particulate matter less than 2.5 µm in diameter (popularly known as PM2.5) poses health hazards in cities worldwide. Although the major sources of PM2.5 are industrial, certain agricultural practices also contribute to the emission and formation of fine particles during certain seasons. CRB, a common practice in Punjab, Haryana and part of Indo-Gangetic Plain, occurs immediately after the paddy harvest in the post-monsoon period (September-November). CRB activities have increased in the past two decades partly due to rise in mechanized agriculture in the 1990s and delayed rice planting in Punjab and Haryana following the Preservation of Subsoil Water Act (2009).

Since 2010, the effects of CRB in Punjab and Haryana on the Delhi and its surrounding area (known as the national capital region - NCR) have been in the spotlight. Yet, no measurements of PM2.5 in the source regions have been conducted. To rectify this, a group of researchers conducted an intensive field campaign involving the states of Punjab, Haryana and the NCR from September 1 to November 30, 2022, using 29 Compact and Useful PM2.5 Instruments with Gas sensors (CUPI-Gs).