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New Chip Uses Quantum Effects To Control Light Beams Dynamically

Alternatively, when circularly polarized OAM states carry different topological charges, the resulting hybrid-order Poincaré sphere can describe full Poincaré beams or C-point singularities. The system’s ability to generate arbitrary structured light fields on diverse Poincaré spheres is crucial for unlocking their full potential in various applications, a need previously unmet by existing free-space optical setups or limited metasurface – and fiber-based schemes.

On-Chip Meta-Generator: Eight-Channel Silicon Photonics

A new silicon photonic integrated circuit dynamically controls light’s properties across multiple dimensions, offering an advance for applications requiring precise beam manipulation. The device, fabricated with a space-multiplexed silicon photonic integrated circuit, overcomes limitations of traditional free-space optics by integrating key components onto a single chip. The researchers highlight the potential for mapping the angular momentum of light onto these high-order spheres, providing a powerful framework for describing structured light beams.

This Deadly Brain Cancer Hijacks Brain Activity to Fuel Its Growth, Study Reveals

Of all the many forms cancer can take, those that arise in the brain can be among the hardest to treat.

A type of tumor known as glioma is a particularly formidable example. These malignant growths arise from glial cells or their precursors in the brain or spinal cord; the worst form – glioblastoma – has a 5-year survival rate of just 5 to 7 percent.

Part of the reason gliomas are so insidiously difficult to treat is that they actively exploit the brain’s crucial functions to feed their growth.

A Human-Specific Gene May Help Explain Our Extraordinary Brainpower

The new findings could help explain what made the human brain unique during evolution.

A mouse’s brain immune cells mature in about three weeks. Their human counterparts take four to eight years, an unusually slow timetable that may help explain how the human brain develops its distinctive cognitive abilities.

Microglia are the brain’s most abundant immune cells. They protect against invading threats, remove damaged neurons and help shape neural circuits as the brain develops. Scientists at Columbia’s Zuckerman Institute have now found for the first time that human microglia, like human neurons, mature far more slowly than those of other animals.

Did Cellular Life Begin Twice? New Study Points to Two Independent Origins

Early metabolism may have begun as a mix of metal and enzyme catalysis before bacteria and archaea independently evolved into free-living cells.

Four billion years ago, the chemistry that eventually became life may have been unfolding around hydrothermal vents, where naturally occurring metals helped drive reactions before cells possessed the full machinery they use today. Researchers at Heinrich Heine University Düsseldorf (HHU) and collaborating institutions have reconstructed part of that transition, tracing how metabolism and enzymes changed as the ancestors of bacteria and archaea began to diverge.

The study, published in Science Advances, examined the chemical network early cells used to produce essential components of life and investigated how those reactions could have been powered. The researchers conclude that the transition to free-living bacteria and archaea may have occurred independently, even though both lineages share the same underlying genetic code.

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