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Bioluminescent bacteria and the Hawaiian bobtail squid have formed a longstanding mutually beneficial relationship. How the bacteria coordinate their behavior to colonize the squid—through cellular signaling and cues from the environment—is detailed in a new study led by Penn State researchers.

A paper describing the study is published in the journal eLife. The researchers also show that the mechanism that they describe is likely to be widespread in a broad array of bacteria and that understanding this coordination of cellular signaling will be important for understanding how bacteria colonize their hosts more generally.

“The bacteria we study, known as Vibrio fischeri, is associated with many different marine hosts, but its association with the Hawaiian bobtail squid is the best characterized,” said Tim Miyashiro, associate professor of biochemistry and molecular biology in the Penn State Eberly College of Science and the leader of the research team.

Queen Mary University researchers have engineered a self-sensing, variable-stiffness artificial muscle that mimics natural muscle characteristics. The breakthrough has significant implications for soft robotics and medical applications, moving a step closer to human-machine integration.

In a study published on July 8 in Advanced Intelligent Systems, researchers from Queen Mary University of London have made significant advancements in the field of bionics with the development of a new type of electric variable-stiffness artificial muscle that possesses self-sensing capabilities. This innovative technology has the potential to revolutionize soft robotics and medical applications.

Technology Inspired by Nature.

Brushing twice a day keeps the dentist away—but can we improve on the toothpaste we use to maintain clean teeth, preventing medical issues that spiral from poor dental health? Most toothpastes use fluoride, a powerful tool for oral hygiene. However, fluoride can pose health problems in some cases, especially for children who consume too much fluoride by swallowing most of their toothpaste: children normally use only a tiny dose of toothpaste to avoid these problems, but that reduces toothbrushing efficacy.

In the search for alternatives, a team of international scientists and Polish clinicians have identified a hydroxyapatite toothpaste that works just as well as fluoride toothpaste to protect against cavities.

“Hydroxyapatite is a safe and effective alternative to fluoride in caries prevention for daily use,” said Professor Elzbieta Paszynska of the Poznan University of Medical Sciences, co-principal investigator and corresponding author of the study published in Frontiers in Public Health.

Gum disease and tooth loss are linked to shrinkage of the hippocampus, an area of the brain crucial for memory. The corresponding study was published in Neurology.

Previous studies suggest that tooth loss and periodontitis may be linked to Alzheimer’s disease. However, recent studies have not found a significant link between tooth loss and periodontitis, and hippocampal atrophy. In the current study, researchers sought to understand more about how oral health affects hippocampal volume-and, thus, memory. To do so, they examined the relationship between number of teeth present and hippocampal atrophy in light of periodontitis severity among middle-aged and older adults.

For the study, the researchers included 172 people with an average age of 67 years old who did not have cognitive decline. At the start of the study, each underwent dental exams and memory tests. They also underwent MRI brain scans at the beginning of the study and four years later to assess their hippocampal volume.

Nick had four surgeries and multiple radiation treatments to treat his ependymoma tumors. He shares what to expect during and after radiation and how cancer changed his outlook on life.

In 2004, when I was 12 years old, I had severe back pain and spasms. When I laid down at night, I experienced episodes where I couldn’t move for 10 to 15 minutes. Since my father was in the medical field, he knew something wasn’t normal.

An MRI showed a 12-centimeter grade I myxopapillary ependymoma inside my spinal column in my lower lumbar. After emergency surgery, the doctors reported they removed all the tumor except for a couple of very microscopic spots.

Large language models like GPT-4 have taken the world by storm thanks to their astonishing command of natural language. Yet the most significant long-term opportunity for LLMs will entail an entirely different type of language: the language of biology.

One striking theme has emerged from the long march of research progress across biochemistry, molecular biology and genetics over the past century: it turns out that biology is a decipherable, programmable, in some ways even digital system.

DNA encodes the complete genetic instructions for every living organism on earth using just four variables—A (adenine), C (cytosine), G (guanine) and T (thymine). Compare this to modern computing systems, which use two variables—0 and 1—to encode all the world’s digital electronic information. One system is binary and the other is quaternary, but the two have a surprising amount of conceptual overlap; both systems can properly be thought of as digital.

The map will help researchers tackle the age-old questions of how structure leads to intelligence and what causes neurological diseases.

There may soon be another option for an Alzheimer’s drug capable of slowing the progression of the devastating disease.

An experimental Alzheimer’s drug from drugmaker Eli Lilly helped slow cognitive decline in patients in the early stages of the illness, according to the results of a late-stage clinical trial. Side effects of the drug, called donanemab, however, were serious in some cases, and included brain swelling and brain bleeds.

Lilly representatives presented the results at the Alzheimer’s Association International Conference in Amsterdam on Monday. The research was published simultaneously in the Journal of the American Medical Association.

Specific nerves may be stimulated artificially, for example to treat pain. The finer the nerves, the more difficult it is to attach the required electrodes. Researchers at the Technical University of Munich (TUM) and NTT Research have now developed flexible electrodes produced with 4D printing technology. On contact with moisture, they automatically fold and wrap themselves around thin nerves. The study is published in the journal Advanced Materials.

The nervous system controls our movements through electrical impulses. These pass from nerve cell to nerve cell until finally, for example, a muscle contraction is triggered. Nerve cells can also be stimulated artificially, triggering the nerves with current pulses via acutely applied or implanted electrodes. Peripheral nerve stimulation is used, for example, to treat chronic pain or sleep apnea.

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