Diamond Sees Through the Cell ⚡ экспресс
Researchers used a quantum sensor based on nitrogen-vacancy centers in diamond to capture ultra-weak magnetic signals from protons inside living cells. The relaxation time T₁ (how quickly nuclear spins return to equilibrium) turned out to be a unique physicochemical fingerprint, allowing them to distinguish between two cancer cell lines without any staining. It's like checking a fruit's ripeness by firmness without cutting it open. This approach paves the way for gentle sorting of rare cells, which is crucial for personalized medicine and diagnostics.
Every cell is a miniature tuning fork. A sharp magnetic pulse makes it 'ring', and the decay of that sound depends on what's inside: viscosity, density, composition. A tiny diamond with a structural defect acts like a hypersensitive microphone, picking up magnetic echoes from individual cells.
This defect — a nitrogen vacancy — is so small that millions fit on the tip of a needle. Yet even a single center can detect the magnetic field of just a few protons.
Researchers tested two cancer cell lines. It turned out that each has its own, like a fingerprint, relaxation time for hydrogen nuclei: in more aggressive cells, the signal fades differently. Without chemical labels or dyes, often harmful to cells, the carbon-based sensor transforms signals from water molecules into a vivid diagnostic picture.
This non-destructive approach is a step toward the cell sorters of the future. They will be useful for finding rare stem cells, personalized diagnostics, and early disease detection.
🎯 Millions of diamond defects can fit on the tip of a needle, but even a single one detects the magnetic field of just a few protons.
🎬 Magnetic reading of cellular 'passports' resembles the workings of a medical tricorder from science fiction.