D S Roman

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Researchers trained an AI to rate the quality of feedback given to medical students during simulated surgical procedures and found that higher-quality feedback directly predicted greater skill gains. Students whose instructors gave specific, reinforcing, and actionable feedback improved their procedural scores measurably more than those who received vague comments. The AI rater agreed with expert evaluators at a high rate, suggesting it could scale feedback quality standards across surgical training programs.

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Researchers built a flexible sensor array called MERLIN that measures nitric oxide directly on wound surfaces to track inflammation in real time. The device detected nitric oxide with high sensitivity and excellent selectivity over other molecules commonly found in wounds. In rat wound studies, MERLIN confirmed that inflammatory nitric oxide peaks at day 3 and produced spatial maps of healing across the wound bed, providing clinically useful diagnostic information.

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Researchers used tiny photonic sensors called microring resonators to detect nitric oxide in real time directly in mouse wound tissue. The sensors encode nitric oxide concentration as a shift in resonant light wavelength, achieving sub-micromolar sensitivity with high specificity over more than 24 hours in biological fluid. The compact chip-based platform can be adapted to detect many other biomarkers, enabling continuous wound or disease monitoring.

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Graphene's unique electrical and structural properties make it well-suited for building interfaces between electronic devices and living excitable cells or tissues. Researchers review recent advances in 2D and 3D graphene-based devices that can both record neural and cardiac signals at high density and deliver targeted electrical stimulation. Further advances in microfabrication and bioengineering are needed to move these platforms toward clinical use.

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Researchers developed a transition-metal-free method for attaching benzyl groups to pyridine rings under mild microwave conditions using zinc-based reagents. The reaction works selectively on specific positions of complex multi-cyano aromatic compounds without expensive catalysts. This scalable approach provides practical building blocks for pharmaceutical chemistry.

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Researchers developed methods for selectively adding chemical groups to cinnoline — a nitrogen-containing ring system found in drug candidates — at positions 3 and 8 using specialized metal-base systems. Sequential metalation allowed them to build doubly substituted cinnolines, which were then further modified via acylation and cross-coupling reactions. The approach expands access to diversely functionalized cinnolines for medicinal chemistry.

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Researchers developed a palladium-catalyzed method for directly attaching aryl groups to cyclopropane rings by activating otherwise unreactive C-H bonds, guided by a picolinamide directing group. The reaction accommodates a variety of aryl iodide coupling partners and consistently produces cis-substituted products with high selectivity. This approach avoids pre-functionalized starting materials and offers a practical route to complex cyclopropane derivatives.

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Potassium tert-butoxide can trigger intramolecular cyclization of aryl ethers, amines, and amides by generating aryl radicals through single-electron transfer, producing 5-membered ring products in high regioisomeric ratios under microwave conditions. This metal-free method forms ring systems found in natural products and drug scaffolds without requiring expensive catalysts. The reaction proceeds cleanly and quickly, making it practically useful for building complex heterocyclic structures.

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Standard transesophageal echocardiography at fixed angles underestimates leakage in prosthetic mitral valves, especially when regurgitant jets hug the vessel wall. Multiplanar imaging, scanning from 0 to 180 degrees, detected significantly larger jet areas and upgraded 8 patients — including 3 initially classified as normal — to more severe regurgitation. Multiplanar transesophageal echocardiography should be the method of choice for evaluating prosthetic mitral valve regurgitation.