Science Society

Join us for an enlightening discussion with Dr. Rupprecht as he unveils a groundbreaking discovery that challenges the previous understanding of astrocytes in the brain. Astrocytes, unlike neurons, were traditionally viewed as cells with largely uncoordinated activity across cellular compartments, exhibiting no central integration of information.

In his research, Dr. Rupprecht and his team describe the principle of 'conditional centripetal integration,' showing that astrocytes do integrate calcium signals from their distal processes. This intriguing observation came from calcium imaging of hippocampal astrocytes and neurons in head-fixed mice, coupled with monitoring of body movements and pupil diameter.

The team found that global astrocytic activity correlated with the concurrent pupil diameter (indicative of arousal level) and past neuronal and behavioral events integrated over seconds. This centripetal integration within individual astrocytes begins in distal processes and propagates slowly towards the soma, facilitated by high arousal levels but inhibited when pre-event calcium levels were high.

This compelling discovery suggests that astrocytes are not mere bystanders but computational units of the brain that slowly and conditionally integrate past information. Tune in to this episode to delve deeper into Dr. Rupprecht's fascinating research and what it means for our understanding of the brain's functioning.

Keywords: Dr. Rupprecht, Astrocytes, Neurons, Conditional Centripetal Integration, Calcium Imaging, Brain, Pupil Diameter, Neuronal Activity, Central Integration.

Centripetal integration of past events by hippocampal astrocytes Peter Rupprecht et al., doi: https://doi.org/10.1101/2022.08.16.504030

This episode delves into the cutting-edge research of Dr. Laffey, who has been investigating the role of Major Histocompatibility Complex:T cell antigen receptor (MHC:TCR) signaling in the development of T cell tumors. While this signaling pathway is crucial for T cell development and immune responses, it can also trigger the formation of T cell tumors under abnormal conditions.

Dr. Laffey's research focuses on a low-frequency progenitor cell population known as Early αβ TCR+ Double-Negative (EADN) cells. Present in both mice and humans, these cells can transform into thymic leukemia. His work has shown that EADN cells do not require MHC for their development, but they can respond to it with high sensitivity when it is present. However, the transformation to leukemia needs MHC, although this requirement can be lost during extended tumor growth.

These findings suggest that MHC:TCR signaling can initiate a leukemia phenotype from an understudied developmental state, highlighting a potential new area of focus for the study and treatment of leukemia. Tune in to understand how Dr. Laffey's research could influence our approach to tackling leukemia and other T cell tumors.

Keywords: Dr. Laffey, Major Histocompatibility Complex, T cell Antigen Receptor, MHC:TCR Signaling, Early αβ TCR+ Double-Negative Cells, Leukemia, Thymic Leukemia, T cell Development, T cell Tumors, Immune Responses.

Early expression of mature αβ TCR in CD4−CD8− T cell progenitors enables MHC to drive development of T-ALL bearing NOTCH mutations https://www.pnas.org/doi/10.1073/pnas.2118529119

In this episode, we delve into the revolutionary work of Dr. Kireev, who is pushing the boundaries of health monitoring with wearable technology. The continuous monitoring of arterial blood pressure (BP) in non-clinical or ambulatory settings plays a critical role in understanding various health conditions, especially cardiovascular diseases. Traditional ambulatory BP devices, while useful, can be cumbersome and intrusive, limiting their usability and comfort for the user.

Enter Dr. Kireev's cutting-edge research. He introduces a wearable continuous BP monitoring platform that is based on electrical bioimpedance, utilizing atomically thin, self-adhesive, lightweight, and unobtrusive graphene electronic tattoos as interfaces with the human body. This technology is able to monitor arterial BP continuously and non-invasively for over 300 minutes, a duration tenfold longer than previous studies.

The readings obtained show remarkable accuracy, equivalent to a Grade A classification, offering immense potential in medical diagnosis and disease correlation with individual behavior, daily habits, and lifestyle. This could potentially enable the analysis of root causes, prognosis, and disease prevention.

Join us as we discuss Dr. Kireev's groundbreaking work and explore the future of health monitoring.

Keywords: Dr. Kireev, Blood Pressure Monitoring, Wearable Technology, Graphene Electronic Tattoos, Electrical Bioimpedance, Cardiovascular Diseases, Health Monitoring, Ambulatory BP Monitoring.

Kireev, D., Sel, K., Ibrahim, B. et al. Continuous cuffless monitoring of arterial blood pressure via graphene bioimpedance tattoos. Nat. Nanotechnol. (2022) https://doi.org/10.1038/s41565-022-01145-w

In this episode, we explore the groundbreaking research by Dr. Kolachalama and his team on addressing the global challenge of dementia, specifically Alzheimer’s disease (AD), which affects nearly 10 million new individuals annually. Their innovative approach integrates artificial intelligence and healthcare, paving the way for enhanced diagnosis of cognitive impairments.

The team's work revolves around a deep learning framework that performs multiple diagnostic steps successively to distinguish between normal cognition, mild cognitive impairment, AD, and non-AD dementias. This model utilizes a wide array of routinely collected clinical data such as demographics, medical history, neuropsychological testing, neuroimaging, and functional assessments.

Interestingly, their models not only compete with the diagnostic accuracy of practicing neurologists and neuroradiologists but also reveal disease-specific patterns of degenerative changes in the brain. They further leverage interpretability methods in computer vision to validate these computational predictions with established medical diagnosis standards.

Join us in this fascinating conversation as we delve into the future of dementia diagnosis and treatment with Dr. Kolachalama.

Keywords: Dr. Kolachalama, Deep Learning, Dementia, Alzheimer’s Disease, Artificial Intelligence, Health Diagnosis, Neurology, Cognitive Impairment, Mild Cognitive Impairment, Non-AD Dementias, Neuropathological Lesions.

Qiu, S., Miller, M.I., Joshi, P.S. et al. Multimodal deep learning for Alzheimer’s disease dementia assessment. Nat Commun 13, 3404 (2022). https://doi.org/10.1038

s41467-022-31037-5

This episode welcomes Dr. Jingang Li, a pioneer in the field of micro robotics and nanotechnology. We discuss the groundbreaking progress in motor miniaturization and its impact on areas like drug delivery, nanotechnology, and biomedical engineering.

Dr. Li introduces us to the world of light-driven opto-thermocapillary nanomotors (OTNMs). These nanomotors operate on solid substrates, where they are free from the interference of Brownian motion that affects their counterparts in liquid environments. The OTNMs can cause the orbital rotation of 80 nm gold nanoparticles around a laser beam, a feat accomplished by optically controlling particle–substrate interactions and thermocapillary actuation.

The remarkable characteristic of these nanomotors is their on-chip operation capability in ambient environments, making them potential light-driven engines to power functional devices at the nanoscale. This breakthrough could herald the dawn of new developments in microtechnology and beyond.

Tune in to this enlightening conversation with Dr. Li, where we delve into the transformative potential of nanomotors.

Keywords: Dr. Jingang Li, Microrobotics, Nanotechnology, Light-driven Opto-thermocapillary Nanomotors, Brownian Motion, Gold Nanoparticles, Laser Beam, Drug Delivery, Biomedical Engineering, Particle-Substrate Interactions, Thermocapillary Actuation.

Opto-Thermocapillary Nanomotors on Solid Substrates Jingang Li, Pavana Siddhartha Kollipara, Ya Liu, Kan Yao, Yaoran Liu, and Yuebing Zheng* https://doi.org/10.1021/acsnano.1c09800

Join us in this fascinating episode with Dr. Araújo, a renowned paleontologist, as we delve into the mysteries of mammalian evolution and the crucial transition to endothermy. Endothermy, the ability of an organism to maintain its body temperature internally, is a feature that has played a significant role in the ecological dominance of mammals and birds. However, when and how this characteristic appeared during mammalian evolution has long been uncertain due to ambiguous fossil evidence.

Dr. Araújo presents his innovative approach to investigate this key evolutionary transition using the morphology of the semicircular ducts of the inner ear. These ducts, filled with endolymph, monitor head rotations and are vital for motor coordination, navigation, and spatial awareness. Changes in these structures could reflect the ectotherm-endotherm transition, as higher body temperatures would impact endolymph viscosity and semicircular duct biomechanics.

Dr. Araújo and his team developed the thermo-motility index, a proxy based on the bony canal morphology, to track morphofunctional changes across 56 extinct synapsid species. Their findings suggest an abrupt evolution of endothermy during the Late Triassic period in Mammaliamorpha, associated with a sharp increase in body temperature and an expansion of aerobic and anaerobic capacities.

This episode provides intriguing insights into the evolution of endothermy and the physiological characteristics that define mammals. Tune in for an enlightening discussion on the mysteries of our evolutionary past.

Keywords: Dr. Araújo, Mammalian Evolution, Endothermy, Semicircular Ducts, Inner Ear, Thermo-Motility Index, Late Triassic, Mammaliamorpha, Paleontology, Synapsid Species, Ectotherm-Endotherm Transition, Body Temperature, Aerobic Capacity, Anaerobic Capacity.

Araújo, R., David, R., Benoit, J. et al. Inner ear biomechanics reveals a Late Triassic origin for mammalian endothermy. Nature (2022). https://doi.org/10.1038/s41586-022-04963-z

Join us in this crucial discussion with Dr. Moseson as we delve into the unique barriers to abortion care that transgender, nonbinary, and gender-expansive (TGE) people face. Given these barriers, many TGE individuals have considered, and some have even attempted, abortion without clinical supervision.

In this episode, Dr. Moseson shares results from a 2019 online survey about sexual and reproductive health among TGE people assigned female or intersex at birth. The study uncovers a significant number of TGE people who have considered or attempted self-managed abortions. These methods varied, with participants reporting the use of herbs, physical trauma, vitamin C, and substance use.

Reasons for self-managed abortion included a desire for privacy, perceived efficiency, and, importantly, several structural issues such as lack of health insurance coverage, legal restrictions, denials of or mistreatment within clinical care, and cost.

Dr. Moseson highlights the urgent need for efforts to dismantle barriers to clinical abortion care and to provide TGE people with information on safe and effective methods of self-managed abortion. The goal is to ensure that TGE people can freely choose a safe and effective abortion, whether in a clinical setting or through self-management.

This episode offers an essential conversation about the intersection of gender identity, reproductive rights, and healthcare access.

Keywords: Dr. Moseson, Transgender, Nonbinary, Gender-Expansive, TGE, Abortion Care, Self-Managed Abortion, Reproductive Health, Healthcare Barriers, Privacy, Autonomy, Structural Issues, Health Insurance, Legal Restrictions, Clinical Care, Gender Identity, Reproductive Rights.

Moseson H, Fix L, Gerdts C, et al Abortion attempts without clinical supervision among transgender, nonbinary and gender-expansive people in the US http://dx.doi.org/10.1136/bmjsrh-2020-200966

Join us in this episode with Dr. Bleris as we dive into the fascinating world of genetic, physical unclonable functions (PUFs) in human cells. PUFs are physical entities that provide a unique and irreproducible identifier for the artifact in which they are embedded. Originally popularized by the electronics industry, PUFs use the inherent physical variations of semiconductor manufacturing to establish intrinsic security measures for attesting integrated circuits.

Inspired by silicon PUFs, Dr. Bleris and his team have embarked on the creation of the first generation of genetic PUFs in human cells. These PUFs are shown to be robust, unique, and unclonable, making them virtually impossible to replicate. Moreover, the team's groundbreaking work with CRISPR-engineered PUFs (CRISPR-PUFs) opens new possibilities for establishing provenance attestation protocols.

This episode sheds light on a new frontier in cell biology, genetic engineering, and identity security. You'll gain insights into the application of genetic PUFs, the potential of CRISPR-PUFs, and the future of biosecurity in this riveting discussion with Dr. Bleris.

Keywords: Dr. Bleris, Genetic PUFs, Physical Unclonable Functions, Silicon PUFs, Human Cells, CRISPR-PUFs, Provenance Attestation Protocols, Biosecurity, Genetic Engineering, Cell Biology.

https://doi.org/10.1126/sciadv.abm4106 Genetic physical unclonable functions in human cells

Title: Navigating Sleep Cycles with Selective Thermal Stimulation: A Conversation with Dr. Haghayegh

Description: The intricate process of regulating sleep-wake cycles involves circadian Process C and homeostatic Process S. In this episode, we welcome Dr. Haghayegh to discuss his research on how selective thermal stimulation (STS) of the cervical spine region can enhance body heat dissipation, increase the distal-to-proximal skin gradient (DPG), and lower core body temperature (CBT). These changes can contribute to shorter sleep onset latency (SOL) and improved sleep quality.

Dr. Haghayegh's team conducted a study involving 11 young, healthy male participants who were challenged to go to bed two hours earlier than usual. They were subjected to treatment and control nighttime sleep sessions. The treatment session involved the use of a dual-temperature zone mattress and an STS pillow, which applied mild heating to the cervical spinal skin for 30 minutes after lights-off.

The study's results highlight a significant increase in blood flow and DPG and a significant decrease in CBT in the treatment night compared to the control. Most notably, SOL was significantly reduced, and subjective sleep quality significantly improved.

Join us as we delve into the findings and implications of this study with Dr. Haghayegh. We'll explore how innovative sleep facilitating systems like STS pillows and dual-temperature zone mattresses can influence sleep cycles and enhance overall sleep quality.

Keywords: Dr. Haghayegh, Sleep-wake Cycle, Selective Thermal Stimulation, Core Body Temperature, Distal-to-Proximal Skin Gradient, Sleep Onset Latency, Sleep Quality, Sleep Science, Sleep Technology, Circadian Process C, Homeostatic Process S.

High ambipolar mobility in cubic boron arsenide https://doi.org/10.1126/science.abn4290

In this enlightening episode, Dr. Ren and Dr. Chen join us to delve into the fascinating properties of Boron Arsenide, a semiconductor noted for its high thermal conductivity and promisingly high ambipolar mobility. This dual mobility of electrons and holes has been confirmed through different measurement methodologies used by Yue et al. and Shin et al., thereby reinforcing the theoretical calculations.

Dr. Ren and Dr. Chen will discuss how Shin et al. successfully measured the high thermal and electrical transport properties concurrently at the same sample location, a noteworthy accomplishment. Yue et al. have made intriguing findings as well, revealing even higher ambipolar mobility than theoretical estimates in some instances.

The combination of high thermal conductivity and high ambipolar mobility makes Boron Arsenide an exciting prospect for various semiconductor applications. The episode will highlight the significance of reducing ionized and neutral impurity concentrations for realizing high mobility and high thermal conductivity, respectively.

Join us as we discuss the immense potential of cubic Boron Arsenide (c-BAs) in paving the way for the next generation of electronics.

Keywords: Dr. Ren, Dr. Chen, Boron Arsenide, Semiconductors, High Thermal Conductivity, High Ambipolar Mobility, Yue et al., Shin et al., c-BAs, Electronics, Next-Generation Electronics, Electron Mobility, Hole Mobility, Impurity Concentrations.

DOI: 10.1126/science.abn4290