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photosynthesis

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🚨 SCIENTISTS JUST DISCOVERED THAT BACTERIA HAVE BEEN USING A QUANTUM ENERGY TRICK FOR BILLIONS OF YEARS. In a breakthrough published in Nature Chemistry, researchers from the University of Sheffield (working with IBM and international collaborators) have shown that purple photosynthetic bacteria (Rhodobacter sphaeroides) use singlet fission (SF) as a functional mechanism to enhance light harvesting. When carotenoids absorb blue-green light (via their S₂ state), the energy rapidly undergoes heterofission: the singlet exciton splits into a pair of triplet excitons shared between a carotenoid and its neighboring bacteriochlorophyll (BChl) a molecule. These triplet pairs are long-lived and weakly coupled. They then recombine via triplet-triplet annihilation (TTA), efficiently populating the BChl a Qy singlet state which then transfers energy to the reaction center. This SF-mediated pathway contributes up to ~18% of total carotenoid-to-BChl energy transfer in some complexes and introduces a temporal “buffering” effect, staggering energy arrival at the reaction center. Why this matters: • It is the clearest demonstration yet that singlet fission plays a genuine, functional role in natural photosynthesis • The heterofission mechanism (triplets on adjacent Crt and BChl molecules) explains how bacteria achieve ultrafast SF while maintaining long-lived, harvestable triplet pairs • This pathway helps organisms make better use of blue-green light and may protect the reaction center during fluctuating light conditions The deeper implication: Nature has evolved a sophisticated way to temporarily store and then cooperatively release electronic energy using spin-protected triplet states. This biological strategy offers new inspiration for designing artificial light-harvesting and energy-conversion systems that can buffer and regulate energy flow something synthetic SF materials have struggled to achieve. We are learning that evolution solved some of the hardest problems in photophysics long before we started trying. How might understanding biological singlet fission change the way we design future solar energy or quantum-inspired technologies? Follow for more frontier photosynthesis research and natural quantum biology.

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$Trees 🌳 have been the original climate tech and carbon capture machinery for 370 million years. No venture capital. No government wealth transfer to corporations. No rare-earth minerals being plundered. No 3-mile-long industrial vacuum cleaner hoovering up carbon dioxide. Just sunlight, water, photosynthesis, carbon capture, flood protection, wildlife habitat and a quiet determination to reduce temperatures. They pull carbon out of the air like it’s their day job. They shade the pavement so cities don’t bake. They drop local temperatures. They breath out oxygen for us to breathe and create a place for birds to live as a bonus. Governments have spent billions trying to invent a machine that does a fraction of what a 200-year-old oak has been casually doing since before we invented the wheel. The most powerful climate technology already exists. We just keep cutting it down. Plant more trees. Protect the ones still standing. Trees are the most natural, long lasting, multi purpose and cost effective infrastructure of them all. But sadly, government facilitated money transfers to corporations doesn’t grow on trees.$

Trees 🌳 have been the original climate tech and carbon capture machinery for 370 million years. No venture capital. No government wealth transfer to corporations. No rare-earth minerals being plundered. No 3-mile-long industrial vacuum cleaner hoovering up carbon dioxide. Just sunlight, water, photosynthesis, carbon capture, flood protection, wildlife habitat and a quiet determination to reduce temperatures. They pull carbon out of the air like it’s their day job. They shade the pavement so cities don’t bake. They drop local temperatures. They breath out oxygen for us to breathe and create a place for birds to live as a bonus. Governments have spent billions trying to invent a machine that does a fraction of what a 200-year-old oak has been casually doing since before we invented the wheel. The most powerful climate technology already exists. We just keep cutting it down. Plant more trees. Protect the ones still standing. Trees are the most natural, long lasting, multi purpose and cost effective infrastructure of them all. But sadly, government facilitated money transfers to corporations doesn’t grow on trees.

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