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William A. Wallace, Ph.D.

@WilliamWallace • 33,005 subscribers

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🔋 Mitochondria run their core power system using bacterial-style DNA. 🧬 But they need your nuclear DNA for support, repair, and growth. Think of it like a battery with its own mini-engine — it sparks on its own, but the car (your cell) builds and maintains it. Bottom line: Mitochondria are semi-independent — powered by ancient bacterial genes, guided by your human ones.

🔋 Mitochondria run their core power system using bacterial-style DNA. 🧬 But they need your nuclear DNA for support, repair, and growth. Think of it like a battery with its own mini-engine — it sparks on its own, but the car (your cell) builds and maintains it. Bottom line: Mitochondria are semi-independent — powered by ancient bacterial genes, guided by your human ones.

109,742 просмотров

You’re looking at neurons growing and connecting in real time 🧠. A 65-hour recording of hippocampal activity in a rat brain. The hippocampus plays a crucial role in memory and learning. In this footage, neurons extend their dendrites and axons, building and reshaping connections across days. Capturing this process live offers a rare view into how neural circuits form and reorganize. Why this matters ⬇️ 1️⃣It’s a continuous, multi-day recording of living hippocampal neurons under the microscope 2️⃣You can clearly see dendritic branching and network formation 3️⃣It reveals the dynamic processes that drive brain development and plasticity Observing growth at this resolution helps researchers understand how neurons connect—and how disruptions in these processes might contribute to neurological or psychiatric conditions. Credit to Louis Romet and Dr. Christophe Leterrier for the video

You’re looking at neurons growing and connecting in real time 🧠. A 65-hour recording of hippocampal activity in a rat brain. The hippocampus plays a crucial role in memory and learning. In this footage, neurons extend their dendrites and axons, building and reshaping connections across days. Capturing this process live offers a rare view into how neural circuits form and reorganize. Why this matters ⬇️ 1️⃣It’s a continuous, multi-day recording of living hippocampal neurons under the microscope 2️⃣You can clearly see dendritic branching and network formation 3️⃣It reveals the dynamic processes that drive brain development and plasticity Observing growth at this resolution helps researchers understand how neurons connect—and how disruptions in these processes might contribute to neurological or psychiatric conditions. Credit to Louis Romet and Dr. Christophe Leterrier for the video

67,497 просмотров

Plants don’t have nerves. But when they’re injured, they send an electrical “SOS” that looks very familiar. When a leaf is cut or bitten, glutamate (the same amino acid that acts as a neurotransmitter in humans) spills out of the damaged cells. In plants, that glutamate flips on a series of glutamate-gated receptors, triggering a rapid calcium wave that races through the stem and leaves. It’s not pain. It’s not consciousness. But it is a long-distance danger signal. And what happens next is biology at its best: • Distant leaves ramp up their defenses • Genes for protection and repair switch on • Chemical pathways shift to heal tissue and deter future damage Humans use glutamate to communicate between neurons. Plants use it to communicate between cells and tissues. Two completely different systems, one molecule playing messenger in both. A reminder that living things often solve survival problems using the same biochemical tools… even when evolution sends them down very different paths. From: Gatsby Plant Science Education Program

Plants don’t have nerves. But when they’re injured, they send an electrical “SOS” that looks very familiar. When a leaf is cut or bitten, glutamate (the same amino acid that acts as a neurotransmitter in humans) spills out of the damaged cells. In plants, that glutamate flips on a series of glutamate-gated receptors, triggering a rapid calcium wave that races through the stem and leaves. It’s not pain. It’s not consciousness. But it is a long-distance danger signal. And what happens next is biology at its best: • Distant leaves ramp up their defenses • Genes for protection and repair switch on • Chemical pathways shift to heal tissue and deter future damage Humans use glutamate to communicate between neurons. Plants use it to communicate between cells and tissues. Two completely different systems, one molecule playing messenger in both. A reminder that living things often solve survival problems using the same biochemical tools… even when evolution sends them down very different paths. From: Gatsby Plant Science Education Program

49,966 просмотров

💪 Muscle cells merging in real time You’re watching one of [in my opinion] the coolest things your body does without you ever noticing (muscle precursor cells literally fusing into one long, powerful fiber). 🔵 Alignment: individual myoblasts migrate and line up like they’re preparing for formation 🟢 Recognition: cells “sense” compatible neighbors through surface proteins 🟡 Contact: membranes begin to thin and synchronize their signaling 🟠 Fusion: boundaries dissolve and nuclei gather inside a shared cytoplasm 🔴 Strengthening: the new multinucleated fiber becomes the machinery that lets you lift, run, and repair The glowing green nuclei are each a tiny command center contributed by a merging cell. The red signal traces the membranes as they stretch, touch, and finally blend into a unified structure. This is how muscles grow and regenerate - i.e. this is "strength" engineerednat the cellular level Credit: Yue Lu, Elizabeth Chen Lab

💪 Muscle cells merging in real time You’re watching one of [in my opinion] the coolest things your body does without you ever noticing (muscle precursor cells literally fusing into one long, powerful fiber). 🔵 Alignment: individual myoblasts migrate and line up like they’re preparing for formation 🟢 Recognition: cells “sense” compatible neighbors through surface proteins 🟡 Contact: membranes begin to thin and synchronize their signaling 🟠 Fusion: boundaries dissolve and nuclei gather inside a shared cytoplasm 🔴 Strengthening: the new multinucleated fiber becomes the machinery that lets you lift, run, and repair The glowing green nuclei are each a tiny command center contributed by a merging cell. The red signal traces the membranes as they stretch, touch, and finally blend into a unified structure. This is how muscles grow and regenerate - i.e. this is "strength" engineerednat the cellular level Credit: Yue Lu, Elizabeth Chen Lab

40,387 просмотров

For most of neuroscience history (until the late 1980s/early 1990s), neurons were treated as the brain’s only decision-makers. That idea is changing. Astrocytes, once considered passive support cells, are now recognized as global regulators of brain state. They don’t encode individual thoughts or actions. Instead, they integrate activity across huge numbers of synapses and adjust how neural networks behave over time. By releasing modulatory signals and tracking slow changes in activity, astrocytes influence: -Alertness vs. fatigue -Stress vs. calm -Motivation vs. disengagement Importantly, they can shift brain function without rewiring neurons, by tuning the environment neurons operate in. The brain isn’t just wired. It’s regulated, and astrocytes play a central role in that regulation.

For most of neuroscience history (until the late 1980s/early 1990s), neurons were treated as the brain’s only decision-makers. That idea is changing. Astrocytes, once considered passive support cells, are now recognized as global regulators of brain state. They don’t encode individual thoughts or actions. Instead, they integrate activity across huge numbers of synapses and adjust how neural networks behave over time. By releasing modulatory signals and tracking slow changes in activity, astrocytes influence: -Alertness vs. fatigue -Stress vs. calm -Motivation vs. disengagement Importantly, they can shift brain function without rewiring neurons, by tuning the environment neurons operate in. The brain isn’t just wired. It’s regulated, and astrocytes play a central role in that regulation.

12,221 просмотров

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Kinesin is one of the body’s smallest transport systems: a molecular motor that walks along microscopic tracks inside your cells, carrying cargo like nutrients, enzymes, and signaling molecules to where they’re needed. 🟡 Moves energy supplies and building materials within cells 🟡 Powers nerve function by transporting molecules along axons 🟡 Keeps cell division, repair, and communication running smoothly Without kinesin, cells would lose their internal delivery network. Signals in the brain would slow, repair processes would stall, and energy wouldn’t reach where it’s needed. Kinesin turns chemistry into motion. Watching it “walk” across microtubules reveals how life maintains order and flow at the molecular level, proof that even the smallest engines inside us keep everything moving.

Kinesin is one of the body’s smallest transport systems: a molecular motor that walks along microscopic tracks inside your cells, carrying cargo like nutrients, enzymes, and signaling molecules to where they’re needed. 🟡 Moves energy supplies and building materials within cells 🟡 Powers nerve function by transporting molecules along axons 🟡 Keeps cell division, repair, and communication running smoothly Without kinesin, cells would lose their internal delivery network. Signals in the brain would slow, repair processes would stall, and energy wouldn’t reach where it’s needed. Kinesin turns chemistry into motion. Watching it “walk” across microtubules reveals how life maintains order and flow at the molecular level, proof that even the smallest engines inside us keep everything moving.

William A. Wallace, Ph.D.

70,156 просмотров • 7 месяцев назад

Chemistry writes the story of life. Every cell, every second, it tells it again - powered by molecular design. At the core of this process lies the citric acid cycle, the central hub of metabolism. Here, acetyl-CoA derived from carbohydrates, fats, or proteins enters a precise series of reactions that convert fuel into energy. Each step transfers electrons, drives ATP synthesis, and sustains the continuous renewal of life at the cellular level. What may seem invisible is, in fact, the most constant motion in existence; the quiet rhythm of biochemistry that powers everything we do.

Chemistry writes the story of life. Every cell, every second, it tells it again - powered by molecular design. At the core of this process lies the citric acid cycle, the central hub of metabolism. Here, acetyl-CoA derived from carbohydrates, fats, or proteins enters a precise series of reactions that convert fuel into energy. Each step transfers electrons, drives ATP synthesis, and sustains the continuous renewal of life at the cellular level. What may seem invisible is, in fact, the most constant motion in existence; the quiet rhythm of biochemistry that powers everything we do.

William A. Wallace, Ph.D.

68,998 просмотров • 7 месяцев назад

Your brain has its own security team, cleanup crew, and maintenance staff all rolled into one type of cell. This video shows microglia, the immune cells that live inside the brain. They move through neural tissue, scan for problems, and keep the environment healthy so neurons can work properly. 🟡 They detect early signs of trouble Microglia sense chemical signals from stressed or injured neurons and move toward the source. ➡️ Example: After a small head injury, microglia are often the first responders. 🟡 They clean and repair Microglia remove debris, damaged proteins, and dead cells to prevent buildup that disrupts brain function. ➡️ Example: During aging, they help clear cellular waste that would otherwise slow down neural communication. 🟡 They shape learning and memory Microglia prune weak or unnecessary synapses, helping the brain stay efficient and flexible. ➡️ Example: During sleep, they help reorganize neural connections so memories form and stabilize. 🟡 They regulate inflammation Microglia decide when inflammation should start and when it should stop. ➡️ Example: Balanced microglia protect brain tissue, while chronically overactive ones contribute to conditions like Alzheimer’s and Parkinson’s. Microglia protect, clean, and fine-tune the brain every second. When they work well, cognition, mood, and resilience remain strong. When they lose balance, the brain becomes more vulnerable to inflammation, aging, and disease.

Your brain has its own security team, cleanup crew, and maintenance staff all rolled into one type of cell. This video shows microglia, the immune cells that live inside the brain. They move through neural tissue, scan for problems, and keep the environment healthy so neurons can work properly. 🟡 They detect early signs of trouble Microglia sense chemical signals from stressed or injured neurons and move toward the source. ➡️ Example: After a small head injury, microglia are often the first responders. 🟡 They clean and repair Microglia remove debris, damaged proteins, and dead cells to prevent buildup that disrupts brain function. ➡️ Example: During aging, they help clear cellular waste that would otherwise slow down neural communication. 🟡 They shape learning and memory Microglia prune weak or unnecessary synapses, helping the brain stay efficient and flexible. ➡️ Example: During sleep, they help reorganize neural connections so memories form and stabilize. 🟡 They regulate inflammation Microglia decide when inflammation should start and when it should stop. ➡️ Example: Balanced microglia protect brain tissue, while chronically overactive ones contribute to conditions like Alzheimer’s and Parkinson’s. Microglia protect, clean, and fine-tune the brain every second. When they work well, cognition, mood, and resilience remain strong. When they lose balance, the brain becomes more vulnerable to inflammation, aging, and disease.

William A. Wallace, Ph.D.

18,581 просмотров • 7 месяцев назад

Everything inside this cell is about to spill out. Your body does a version of this ~60 billion times a day, except it's coordinated. This is a Frontonia, a ciliate about the size of a grain of sand. You can see its food vacuoles full of digested algae, cilia still beating, and the moment the membrane fails and everything spills out. Damaged or old cells are dismantled from the inside and cleared without inflammation. When that system breaks down, you get either uncontrolled growth (cancer) or excessive loss (neurodegeneration). The difference between a single cell dying and a multicellular organism managing death is basically the difference between a building collapsing and a building being demolished on schedule.

Everything inside this cell is about to spill out. Your body does a version of this ~60 billion times a day, except it's coordinated. This is a Frontonia, a ciliate about the size of a grain of sand. You can see its food vacuoles full of digested algae, cilia still beating, and the moment the membrane fails and everything spills out. Damaged or old cells are dismantled from the inside and cleared without inflammation. When that system breaks down, you get either uncontrolled growth (cancer) or excessive loss (neurodegeneration). The difference between a single cell dying and a multicellular organism managing death is basically the difference between a building collapsing and a building being demolished on schedule.

William A. Wallace, Ph.D.

10,845 просмотров • 4 месяцев назад

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