Naked Scientists: Motor Neurone Disease Care, Carbon Capture Sponge, JWST Hydrocarbons in a Young Star Disk, and Auto Brewery Syndrome

Overview

The Naked Scientists host takes listeners through four science stories spanning medicine, chemistry, astronomy and clinical neuroscience. The episode opens with an update on motor neurone disease (MND) and patient care, followed by a report on a low‑cost activated carbon sponge for direct air carbon dioxide capture, a discussion of hydrocarbons detected in a protoplanetary disk by the James Webb Space Telescope, and a case study of auto brewery syndrome where gut fungi produce alcohol leading to intoxication even without drinking. The show also features a question and answer segment on cell regeneration and aging.

• Motor neurone disease explained, with emphasis on nerves, muscle weakness, and supportive care options
• A carbon capture sponge that stores hydroxide ions to bind CO2, regenerable at about 100 C
• James Webb Space Telescope observations revealing hydrocarbons in a disk around a very low mass star
• A rare auto brewery syndrome case involving endogenous alcohol production and management

Introduction and episode scope

The podcast presents a tour of recent scientific advances across neurology, materials science, astronomy and medical microbiology. Host Rhys James introduces four key segments and frames the episodes around practical implications of the science, from patient care to climate solutions and planetary formation.

MND interview and patient care

The first major segment centers on motor neurone disease (MND). A consultant neurologist, Dr John Ealing, explains that MND is a condition in which motor nerves die or fail to function properly, leading to progressive weakness of voluntary muscles, with potential impact on speech, swallowing and breathing. The discussion covers the epidemiology, noting higher prevalence in men and older populations, but with notable younger cases such as Rob Burrow and Stephen Hawking. The neurologist emphasizes that MND is likely a group of related disorders with genetic and environmental contributions rather than a single disease. The clinical trajectory is variable, and prognosis on an individual basis is difficult to predict. In terms of management, the team discusses multidisciplinary care, including speech and swallowing support, non‑invasive ventilation, and riluzole, which offers modest benefit with minimal side effects. The emphasis is on individualized care, with attention to quality of life and independence, and a note on the significant impact of Rob Burrow’s campaign to raise awareness. The segment provides a practical picture of current standards of care rather than a cure.

Direct-air carbon capture with an activated carbon sponge

The episode then shifts to chemistry and engineering where Cambridge researchers describe a low‑cost, energy‑efficient approach to capturing carbon dioxide directly from the air using an activated carbon sponge. The material acts as an electrode in a battery-like setup; when charged it stores hydroxide ions in tiny pores within the carbon. These hydroxides react with CO2 to form bicarbonate, effectively removing CO2 from the air. The sponge can undergo many absorption–desorption cycles; heating regenerates the material and releases the captured CO2 for storage or use. The researchers highlight energy advantages: regeneration can occur at relatively low temperatures (around 100 C), and the material can be heated in situ by flowing current, mimicking toaster-like heating. The discussion addresses deployment considerations, including the need for cheap, renewable electricity and proximity to storage sites where CO2 can be sequestered underground, as in Iceland. The potential is framed not as a silver bullet but as part of a broader carbon‑management strategy.

Hydrocarbons in protoplanetary disks observed by JWST

In the following science discussion, the James Webb Space Telescope (JWST) observations are described. The team focused on disks around sun-like stars and much smaller, lower‑mass stars to characterize the inner regions where rocky planets form. In a disk around a star with only a tenth of the Sun’s mass, abundant hydrocarbons are detected, which is unusual compared with the more oxygen-rich chemistry commonly seen in star-forming regions. This discovery, supported by infrared spectroscopy and careful correction of instrumental artifacts, reveals a carbon-rich signature in the inner disk. The implications concern planetary formation: how such chemical environments influence the composition of rocky planets and potentially gas-rich planets that could form in these environments. The discussion also notes the challenges of observing forming planets directly and the role of JWST in opening a new window into disk chemistry and planetary formation processes.

Auto Brewery Syndrome case study

The next segment presents a rare medical syndrome known as Auto Brewery Syndrome, where the gut microbiome and fungus ferment carbohydrates to produce alcohol, sometimes resulting in dangerously high blood alcohol levels. A case from Rahel Zaldeh at the University of Toronto describes a 50-year-old woman with multiple ER visits for slurred speech, gait imbalance, and high blood alcohol concentrations despite denying alcohol use. After initial misdiagnoses of alcohol use disorder by several clinicians, a seventh visit led to the probable diagnosis of Auto Brewery Syndrome. Treatment included antifungal therapy (fluconazole) and a low-carbohydrate diet with dietitian input. Some relapses occurred when carbohydrate intake rose again, but they were managed with additional antifungal therapy and ongoing dietary adjustments. The discussion highlights disrupting factors such as gut microbiome balance, gut motility, liver function, and possible genetic predispositions. The story illustrates how complex systemic processes can masquerade as other conditions and underscores the need for interdisciplinary care and follow-up to minimize relapses.

Question of the week and regeneration overview

The episode closes with a discussion on cell regeneration and aging. Nadia Rosenthal explains that many cell types maintain the ability to replace themselves, while others, such as nerve and heart muscle cells, do not readily regenerate. Regeneration varies across species; starfish and salamanders can regenerate limbs, whereas humans mostly replace aged cells in a controlled way and rely on progenitor cell pools. The conversation emphasizes that aging involves accumulated cellular damage and mutations, but that replacement mechanisms are a key part of maintaining tissue function. The host thanks the contributor and previews a forthcoming question on memory and the brain, inviting listeners to engage with the show.

Conclusion and calls to action

The podcast ends with a reminder of the show's Cambridge roots and its association with Spitfire and Epidemic Sound for production and sponsorship acknowledgments. Listeners are invited to support the show and submit questions via the Naked Scientists website.