Biophotons and Life Glow: From Living Skin to the ISS Microbiome

Biophotons and Life Glow

This episode investigates biophotons, the faint visible light emitted by living cells, and what this light can reveal about life and death. Through a question-driven chat, the hosts explore a University of Calgary study that uses ultra-sensitive cameras to visualize biophotons from living tissues and the end-of-life glow in a kept mouse sample.

In a second thread, the conversation turns to plants, showing how biophotons illuminate injury and healing in a leaf, offering a potential non-invasive window into cellular metabolism and tissue response.

• Visible light is produced by metabolic activity, hinting at a real, observable glow of life.
• Metabolic light may distinguish living versus dying states, though practical limits remain.
• The discussion links biology to physics in a new way of sensing life at the cellular level.
• Applications could include organ transport diagnostics and crop/forest health monitoring.

Overview: Biophotons and Life Glow

The podcast delves into biophotons, the ultra-weak visible light emitted by all living cells as a byproduct of metabolism. The co-hosts explain that while photons from metabolism are incredibly few—roughly a handful per cell compared with the billion-billion photons from a light bulb—their accumulation in dark, highly sensitive experiments can reveal whether a tissue is alive or dead. The idea is not metaphorical; it is about detecting real, physical light produced by ongoing biological processes.

The episode introduces Daniel O Block, a University of Calgary physicist who studies the interface between quantum physics and biology. He and colleagues have explored whether a camera sensitive enough to detect biophotons could indicate life in a sample, such as a single leaf or a small animal, without invasive techniques. A key detail shared is that metabolism generates photons as part of cellular activity, but the photons are extraordinarily faint, making detection challenging and highly dependent on experimental conditions.

An especially striking example is the experiment with a dead and a living mouse. In a controlled dark box held at body temperature, researchers captured a glow from the living mouse that appeared as a colored, brain-like map in a photonic image, while the dead mouse showed a dissolving pattern of blue dots as life faded. The host describes it as a stark, almost graphic window into whether a being is alive or not, while acknowledging the interpretation is grounded in chemistry, not a soul-like essence. This leads to a broader reflection on life’s glow as a physical phenomenon rather than a metaphysical one.

“It's literally true, every cell glows with visible light as the light of life” - Vox

They also examine a leaf and minor injuries to see how metabolism responds to damage. Scrapes on the leaf reveal white streaks where cells react metabolically, suggesting the leaf bleeds energy to heal itself. The researchers interpret this as a visible mapping of metabolic activity spreading from an injury, with the visualization offering a potential diagnostic tool for plant health and forest monitoring.

Despite the excitement, the hosts stress that biophoton imaging is still in early days, with significant confounding factors and extremely small photon signals. Daniel Block notes that peering into a brain non-invasively would require ruling out photons from skin and other tissues. Still, the discussion emphasizes the possibility that regular light, not just infrared heat, could someday help monitor living processes in humans, plants, and perhaps even in agricultural or forestry contexts.

Beyond the lab, the conversation spins toward practical implications: how better imaging could improve organ preservation and transport diagnostics, track crop or forest health, and illuminate the relationship between life and the surrounding environment. The hosts conclude with a sense of wonder about life’s glow and the potential of biophotons to reshape how we detect and understand life at the smallest scales.

Quotes

"“It's literally true, every cell glows with visible light as the light of life”" - Vox