Science Society

In this intriguing episode, we welcome Dr. Maldonado, who takes us on a journey into the realm of food addiction, its relation to obesity and other eating disorders, and the largely unknown mechanisms driving these behaviors. Dr. Maldonado's groundbreaking research delves into the role of microRNA (miRNA) expression in food addiction.

We discuss the striking similarities found between miRNA signatures in the medial prefrontal cortex of animals and circulating miRNA levels in humans. This comparison has shed light on several miRNAs of potential interest in understanding the development of food addiction.

Dr. Maldonado shares fascinating insights on how the inhibition of specific miRNAs, like miRNA-29c-3p and miRNA-665-3p, in the mouse mPFC can impact behavior and increase vulnerability to food addiction. On the other hand, we explore how the inhibition of miRNA-137-3p doesn't seem to contribute to food addiction.

These findings open up an exciting field of study that could lead to the identification of innovative biomarkers for food addiction and inform future interventions. Join us as we explore the intriguing world of epigenetic mechanisms and their role in food addiction.

Keywords: Food Addiction, Obesity, Eating Disorders, MicroRNA, Dr. Maldonado, Behavioral Control, Epigenetic Mechanisms, miRNA-29c-3p, miRNA-665-3p, miRNA-137-3p.

miRNA signatures associated with vulnerability to food addiction in mice and humans https://doi.org/10.1172/JCI156281

In this compelling episode, we're joined by Dr. Birner, who leads us into the fascinating world of atmospheric science. We explore the little-known issue of the increasing concentration of helium in our atmosphere and the potential implications this has on our understanding of fossil fuel consumption and our planet's atmosphere.

Dr. Birner reveals the surprising findings of his research: a clear build-up of helium-4 concentrations in the atmosphere over the past five decades. Based on a high-precision mass spectrometry technique and analysis of 46 air samples acquired between 1974 and 2020, the study has enabled a direct measure of the rise in atmospheric helium-4.

This episode delves into the potential sources of the increasing helium concentrations and why this exceeds current estimates of anthropogenic emissions from natural gas, nuclear weapons, and nuclear power generation. This suggests a potential problem with previous isotope measurements or an incorrect assessment of known sources.

Join us as we explore these groundbreaking findings and their implications, providing a fresh perspective on the impact of fossil fuel consumption on our atmosphere.

Keywords: Helium, Atmosphere, Dr. Birner, Mass Spectrometry, Fossil Fuels, Climate Change, Greenhouse Gases, Atmospheric Science, Helium-4, Helium-3.

Birner, B., Severinghaus, J., Paplawsky, B. et al. Increasing atmospheric helium due to fossil fuel exploitation. Nat. Geosci. 15, 346–348 (2022). https://doi./10.1038/s41561-022-00932-3

In this enlightening episode, we're joined by Dr. Santos, a scientist at the forefront of finding innovative solutions to the global health crisis posed by antibiotic-resistant bacteria. He shares his fascinating research on the use of visible light-activated synthetic molecular machines (MMs) as a unique and effective antibacterial therapy.

Dr. Santos's work shows that these MMs can kill a broad range of bacteria, including the notorious methicillin-resistant Staphylococcus aureus, in mere minutes. This represents a significantly quicker action than conventional antibiotics. We delve into how these MMs operate, including their ability to disrupt bacterial membranes physically and enhance the effect of conventional antibiotics when used at sublethal doses.

In this conversation, we discuss the impressive fact that no resistance development was observed even after repeated exposure to these MMs. Dr. Santos also explains how therapeutic doses of MMs have significantly reduced mortality in an in vivo burn wound infection model.

This episode is a must-listen for anyone interested in the latest innovative approaches to tackling the ever-growing issue of antibiotic resistance. Join us as we shed light on this groundbreaking research and its implications for global healthcare.

Keywords: Antibiotic Resistance, Bacteria, Molecular Machines, Light-Activated Therapy, Dr. Santos, Global Health Crisis, Antibacterial Therapy.

https://doi.org/10.1126/sciadv.abm2055 Light-activated molecular machines are fast-acting broad-spectrum antibacterials that target the membrane

In this exciting episode, we're joined by Dr. Congreve, who introduces us to a game-changing technology in the field of three-dimensional (3D) printing. Stereolithography, one of the most successful techniques in 3D printing, has its limitations due to the linear absorption of light. This factor restricts both the choice of resin and the range of shapes that can be produced.

In order to overcome this challenge, Dr. Congreve's team has utilized triplet fusion upconversion, a technique that enables volumetric printing with less than 4 milliwatt continuous-wave excitation. This strategy offers a leap beyond the traditional interfacial paradigm of 3D printing and allows for the creation of more complex structures without the restrictions associated with high laser power.

Dr. Congreve further discusses the introduction of an excitonic strategy to systematically control the upconversion threshold, supporting monovoxel or parallelized printing schemes. This enables 3D printing at power densities significantly lower than those required for two-photon-based 3D printing.

Join us as we delve into this groundbreaking technology and its potential impact on the future of 3D printing.

Keywords: Dr. Congreve, 3D Printing, Stereolithography, Triplet Fusion Upconversion, Volumetric Printing, Excitonic Strategy, Monovoxel, Parallelized Printing Schemes.

https://doi.org/10.1038/s41586-022-04485-8 Triplet fusion upconversion nanocapsules for volumetric 3D printing

In this enlightening episode, we are joined by Dr. Bennett, who takes us through his ground-breaking research on the genetic basis of temporal summation of pain, or "wind-up". This process, where the repeated application of noxious stimuli leads to progressively increased pain perception, plays a pivotal role in various clinical pain disorders.

Dr. Bennett's team has utilized a Genome-Wide Association Study (GWAS) to reveal a significant association between human pain wind-up and the NCX3 locus, encoded by the SLC8A3 gene. Intriguingly, NCX3 null mice exhibited hypersensitivity in inflammatory and neuropathic pain models, with dorsal horn neurons showcasing increased wind-up and intracellular calcium following repetitive stimulation.

This episode discusses how the virally mediated enhanced spinal expression of NCX3 can potentially reduce central sensitization, opening up new avenues for pain management. This research underscores the role of calcium efflux as a pathway underpinning temporal summation and persistent pain, offering a promising target for therapeutic intervention.

Join us as we delve into these findings and their implications, offering valuable insights into pain perception's genetic associations.

Keywords: Dr. Bennett, Pain Perception, NCX3, Wind-up, GWAS, SLC8A3, Neuropathic Pain, Inflammatory Pain, Central Sensitization, Genetics of Pain.

Sodium-calcium exchanger-3 regulates pain ‘‘wind- up’’: From human psychophysics to spinal mechanisms https://doi.org/10.1016/j.neuron.2022.05.017

In this episode, we explore the complex world of climate change with distinguished scientist Dr. England. With climate projections indicating a potential weakening or even collapse of the Atlantic Meridional Overturning Circulation (AMOC) due to global warming, it's critical to understand the potential ramifications on a global scale. The impacts could range from altered Atlantic Ocean heat transport to changes in Arctic sea ice extent and regional North Atlantic climate.

Dr. England's research sheds light on the more far-reaching effects of AMOC collapse, particularly the potential teleconnections to adjacent basins and into the Southern Hemisphere. Through the use of a global climate model, he shows that an AMOC collapse could accelerate the Pacific trade winds and Walker circulation. This change results from excess heat left in the tropical South Atlantic due to AMOC collapse, leading to anomalous atmospheric convection and strengthened Walker circulation and trade winds.

Dr. England further discusses other teleconnections, including the weakening of the Indian and South Atlantic subtropical highs and the deepening of the Amundsen Sea Low. These findings provide a vital insight into how the global climate might respond to continued increases in greenhouse gases.

Join us as we delve into these pressing issues and their potential impact on our future climate.

Keywords: Dr. England, Climate Change, Global Warming, AMOC Collapse, Pacific Trade Winds, Walker Circulation, Teleconnections, Global Climate Response, Greenhouse Gas Increases.

Orihuela-Pinto, B., England, M.H. & Taschetto, A.S. Interbasin and interhemispheric impacts of a collapsed Atlantic Overturning Circulation. Nat. (2022). https://doi.org/10.1038/s41558-022-01380-y

Join us in an intriguing discussion with Dr. Arshamian, who challenges traditional notions about how our cultural background influences our perception of smells. While the role of culture in determining our sensory experiences has long been acknowledged, Dr. Arshamian's research suggests a minimal impact of culture on the perception of odor pleasantness.

His fascinating study, involving 225 individuals from 9 diverse non-western cultures, found that culture accounted for only 6% of the variance in pleasantness rankings of smells, with individual variability or personal taste explaining a substantial 54%. The findings reveal a significant degree of global consistency, with the identity of the molecules making up the smells explaining 41% of the variance in odor pleasantness rankings.

Dr. Arshamian's research also demonstrates that these universal rankings could be predicted by the physicochemical properties of new molecules and pleasantness ratings given by a tenth group of western urban participants. This research provides a new perspective on olfactory perception and suggests that it is primarily governed by universal principles. Tune in to learn more about these findings and their implications for understanding our sensory experiences.

Keywords: Dr. Arshamian, Olfactory Perception, Odor Pleasantness, Culture, Sensory Experience, Physicochemical Properties, Personal Taste, Universal Principles.

https://doi.org/10.1016/j.cub.2022.02.062 The perception of odor pleasantness is shared across cultures

On this episode, we're delighted to host Dr. Kakugo, a leading voice in the realm of micro-robotics and nanotechnology. His latest research explores an innovative approach to molecular transportation, employing the cooperative action of numerous artificial molecular machines. These are essentially photoresponsive DNA-conjugated microtubules propelled by kinesin motor proteins.

Dr. Kakugo's team uses photoirradiation to trigger these microtubules to form cooperative groups. This technique allows them to load, transport, and unload cargo by disassembling the groups into individual microtubules. With this group formation, these molecular transporters can handle larger cargoes and transport them over greater distances compared to single transporters.

Dr. Kakugo's research also demonstrates the potential to collect cargo at specific user-determined locations, guided by ultraviolet light exposure. This groundbreaking work offers exciting potential for the development of molecular robots with advanced functionalities by leveraging the principle of cooperation.

Tune in to learn more about how this research is poised to revolutionize the future of micro-robotics and nanotechnology.

Keywords: Dr. Kakugo, Microrobotics, Nanotechnology, Molecular Machines, Cooperative Task, Molecular Transportation, Photoresponsive DNA, Kinesin Motor Proteins.

https://doi.org/10.1126/scirobotics.abm0677 Cooperative cargo transportation by a swarm of molecular machines

In this episode, we're joined by Dr. García-Ruiz to delve into the fascinating subject of cooperative breeding. Traditionally, the evolution of this practice has been credited to the workings of kin selection. However, Dr. García-Ruiz's pioneering research sheds light on the significance of direct fitness benefits and the relative contributions of different selection mechanisms.

Through their modeling, Dr. García-Ruiz's team uncovers several intriguing insights. They find that direct fitness benefits from grouping primarily drive the evolution of philopatry or remaining in one's birthplace. Furthermore, while kin selection predominantly influences the emergence of alloparental care, group augmentation also emerges as a sufficient motivator in harsh environments.

According to their results, the coevolution of philopatry and alloparental care is subject to positive feedback. Additionally, age-dependent dispersal is triggered by both group benefits and relatedness. Empirical data support these model predictions and open up exciting avenues for comparative analyses and experimental tests of causality.

Join us as we navigate the complex world of cooperative breeding and the fascinating interplay between kin selection, direct fitness benefits, and environmental factors with Dr. García-Ruiz.

Keywords: Dr. García-Ruiz, Cooperative Breeding, Evolution, Kin Selection, Philopatry, Alloparental Care, Group Augmentation, Direct Fitness Benefits.

https://doi.org/10.1126/sciadv.abl7853 The evolution of cooperative breeding by direct and indirect fitness effects

Title: A Comprehensive Recap of Our Weekly Guest Speaker Series

Description:

Join us for this summary episode where we dive into the highlights from our recent guest speaker series. Each week, we had the privilege of hosting exceptional thought leaders and researchers from diverse fields, who shared their pioneering research, intriguing discoveries, and insightful perspectives.

Our lineup featured some of the greatest minds in fields spanning from neuroscience and genomics to environmental science and artificial intelligence. These discussions touched on everything from the intricacies of brain development and the mysteries of the human genome to groundbreaking solutions for environmental challenges and innovative advancements in AI technology.

In this episode, we'll revisit the key takeaways from each speaker, reflect on the questions posed by our audience, and look at how these discussions contribute to our understanding of these complex topics. We will also provide a sneak peek into our upcoming lineup of guest speakers.

This is a fantastic opportunity to catch up on any discussions you may have missed, refresh your memory on those you attended, and gain an overview of the diverse topics we've explored so far in our series. Don't miss out on this comprehensive review of our enriching conversations with these trailblazing guests!

Keywords: guest speaker series, neuroscience, genomics, environmental science, artificial intelligence, recap, summary, research, discovery, advancements.