Un gruppo di ricercatori dell’Università Statale di Milano ha scoperto che fare pause mentre si cammina può aumentare notevolmente il dispendio energetico rispetto a farlo in modo continuo.
L’esperimento, pubblicato sulla rivista Proceedings of the Royal Society, ha dimostrato che camminare o salire le scale in brevi sessioni di 10-30 secondi fa consumare energia dal 20 al 60% in più che percorrere la stessa distanza senza pause. Questo significa anche che alzarsi dalla sedia per fare qualche passo ogni tanto o scegliere di prendere le scale può innalzare notevolmente il nostro consumo energetico giornaliero.

I risultati di uno studio internazionale coordinato dall’Università di Padova aprono nuove prospettive per indurre nelle cellule risposte efficaci, in grado di contrastare le metastasi tumorali.

Il mitocondrio è un organello presente all’interno delle nostre cellule con diverse funzioni, tra cui alcune fondamentali legate al metabolismo e alla produzione di energia. Pressoché tutte le cellule degli organismi eucarioti contengono numerosi mitocondri, che formano una estesa rete filamentosa all’interno di ciascuna cellula. Questa rete va incontro a continue divisioni e fusioni che accorciano e allungano dinamicamente i singoli mitocondri. In un articolo pubblicato sulla prestigiosa rivista Nature Cell Biology, un gruppo internazionale di ricercatori, coordinato dal professor Sirio Dupont, dell’Università di Padova, hanno mostrato l’esistenza di un meccanismo universale, comune a molti diversi tipi di cellule.

Recent research from the University of Helsinki sheds new light on the behaviour of the KRAS gene in two of the deadliest cancers—pancreatic and colorectal cancer. These findings suggest potential pathways for targeted therapies in KRAS-driven cancers.

KRAS, a gene known to be mutated in various cancers, has effects that are more complex than previously understood. While the role of cancer-driving, mutated forms of KRAS is well-known, this new work reveals the importance of the presence or absence of the normal, non-mutated version of KRAS.

Research published in Nature Genetics on Oct.14, by Yale Cancer Center researchers at Yale School of Medicine, found a higher concentration of a specific kind of DNA — extrachromosomal or ecDNA — in more aggressive and advanced cancers that could mark them as targets for future therapies.

Using data available from The Cancer Genome Atlas, the International Cancer Genomics Consortium, the Hartwig Medical Foundation, and the Glioma Longitudinal Analysis Consortium, the researchers considered more than 8,000 tumor samples, divided between newly diagnosed untreated tumors and those that had been through previous treatments such as chemotherapy, radiation, and others. They found significantly higher amounts of ecDNA in tumors from previously treated patients, leading to the theory that ecDNA might give a survival advantage to those tumors.

“Our research suggests that ecDNA helps tumors become more aggressive,” said senior author of the paper, Roel Verhaak, the Harvey and Kate Cushing Professor of Neurosurgery at Yale School of Medicine and member of Yale Cancer Center. “EcDNA has a distinct mechanism and plays an important role, not just for breast or lung cancer, but across many cancer types.”

Understanding where shooting stars and meteorites come from is a question that scientists have been trying to answer since ancient times.
Until recently, only 6% of meteorite falls had been linked to their source.
A team led by scientists from CNRS, ESO, and Charles University has notably shown that 70% of all meteorite falls come from just three young asteroid families.
An international team led by three researchers from the CNRS1, the European Southern Observatory (ESO, Europe), and Charles University (Czech Republic) has successfully demonstrated that 70% of all known meteorite falls originate from just three young asteroid families. These families were produced by three recent collisions that occurred in the main asteroid belt 5.8, 7.5, and about 40 million years ago. The team also revealed the sources of other types of meteorites; with this research, the origin of more than 90% of meteorites has now been identified. This discovery is detailed in three papers, a first published on 13 September 2024 in the journal Astronomy and Astrophysics, and two new papers to be published on 16 October 2024 in Nature.

University of Illinois Urbana-Champaign aerospace engineering Ph.D. student Nicolas Rasmont assembling his radar inferometry instrument in the lab.

Researchers at the University of Illinois Urbana-Champaign developed a new instrument to measure the density of the dust that kicks up when spacecraft thrusters interact with planetary surfaces as it lands. Because cameras and other optical equipment are blinded by dense dust clouds, the new instrument uses millimeter-wave radar in a new way to accurately measure the dust and debris.

“Other measurement techniques exist, but our instrument addresses a sort of ‘missing middle.’ It is applicable to particle clouds which are too dense for optical measurements but too thin for state-of-the-art opaque multiphase techniques like X-rays or MRI. It is also capable of several thousands of measurements per second,” said Nicolas Rasmont, Ph.D. student in the Department of Aerospace Engineering. “Our instrument uses a radar to generate waves with a wavelength of 3.8 mm, just over an eighth of an inch. The wave travels through a cloud of particles, then is reflected, then captured back by our instrument to detect the presence of the particles.”

Climate change has a negative impact on food security. An international research team led by Wolfram Weckwerth from the University of Vienna has now conducted a study to investigate the natural variation of different chickpea genotypes and their resistance to drought stress. The scientists were able to show that chickpeas are a drought-resistant legume plant with a high protein content that can complement grain cultivation systems even in urban areas. The study was recently published in the specialist magazine The Plant Biotechnology.

Long periods of drought stress have also become a reality in Central Europe due to climate change, a major threat to plant productivity, harvests and therefore food security. At the same time, there is a decline in the use of plant genetic diversity, and the global food system has become more and more uniform. While there are approximately 7,000 edible crops, two-thirds of global food production is based on just nine crop species. "This narrow genetic base can have several negative consequences, such as increased susceptibility of plants to diseases and pests, reduced resistance to factors such as drought and climate change, and increased economic fragility," explains molecular biologist Wolfram Weckwerth from the University of Vienna. "Maintaining adequate plant and genetic diversity is crucial for agriculture, which must adapt to future changing conditions. With our new study, we have taken an important step in this direction and looked at the chickpea as an important food of the future," says Weckwerth.

Emotional eating and uncontrolled eating are more common in middle-aged women diagnosed with polycystic ovary syndrome (PCOS). In particular, psychological distress increased the long-term risk of disordered eating behaviour. This finding is highlighted in a recent study by the University of Oulu and ODL Sports Clinic.
Previous research has shown that young women of reproductive age with PCOS experience more body dissatisfaction and have a risk of binge-eating disorder that is up to three times higher than that of others. The newly published study demonstrates for the first time that disordered eating behaviour is also prevalent among middle-aged women with PCOS.

Particularly, depression and anxiety, previous weight-loss attempts, and perceiving oneself as overweight increased the risk of disordered eating behaviour.
"In the management of PCOS, weight control is often central, but without appropriate support, weight-loss methods can be drastic and, at worst, lead to eating disorders. Weight-related stigma can also exacerbate the situation," says Doctoral Researcher Emilia Pesonen.

Europe faces growing food supply demands and a shortage of non-renewable raw materials for fertilisers. But producing more from available resources is possible, say researchers: "The nutrients we need are before our eyes, ready to be transformed."
European farmers face a monumental dual challenge: increasing food production while meeting daunting deadlines imposed by the green transition. Amid the drive to produce greener, more efficient fertilisers, new technologies seek to squeeze maximum potential from nutrients that have long been imported, but which until now have been under-exploited. “An important part of the nutrients we have been importing for years are here, ready to be transformed and to be given another life,” says Javier Brañas Lasala, Director of Research, Development and Innovation at the Spanish fertiliser producer Fertiberia. Using nutrients from bio-waste to reduce Europe’s dependency on non-renewable raw materials and increase the efficiency of new sustainable fertilisers is one of the main goals of B-Ferst, a 5-year European project he coordinates, due to end this October.

La siccità controllata può aumentare sino al 30 per cento la resa di olio essenziale del rosmarino rendendo questa pianta una candidata ideale per la valorizzazione di terreni agricoli marginali e con limitata disponibilità idrica. Il risultato arriva da uno studio pubblicato sulla rivista Industrial Crops and Products e realizzato dall’Università di Pisa, dall’Istituto Nazionale di Ottica INO-CNR Pisa, dalla Scuola Superiore Sant’Anna e dall’Università Catania. Le sperimentazioni sono state condotte in Sicilia, in aziende agricole della provincia di Ragusa, tra l’autunno del 2022 e la primavera del 2023.