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<p>A 2-D plate showing alternating cesium lead chloride (blue) and cesium lead bromide (green) segments. (Credit: Letian Dou/Berkeley Lab and Connor G. Bischak/UC Berkeley)</p>

New Class of &#8216;Soft&#8217; Semiconductors Could Transform HD Displays

New research by Berkeley Lab scientists could help usher in a new generation of high-definition displays, optoelectronic devices, photodetectors, and more. They have shown that a class of “soft” semiconductors can be used to emit multiple, bright colors from a single nanowire at resolutions as small as 500 nanometers. The work could challenge quantum dot displays that rely upon traditional semiconductor nanocrystals to emit light.

<p>Mouse fibroblast cells expressing HP1alpha, the human version of heterochromatin protein 1a. A technique that highlights edges between two liquid phases reveals the liquid droplets in the nucleus. (Credit: Amy Strom/Berkeley Lab)</p>

Researchers Find New Mechanism for Genome Regulation

The mechanisms that separate mixtures of oil and water may also help the organization of a part of our DNA called heterochromatin, according to a new Berkeley Lab study. Researchers found that liquid-liquid phase separation helps heterochromatin organize large parts of the genome into specific regions of the nucleus. The work addresses a long-standing question about how DNA functions are organized in space and time, including how genes are silenced or expressed.

Keeping California’s Natural Gas System Safe

The massive natural gas leak at Aliso Canyon shined a light on California’s aging natural gas infrastructure. And five years of extreme drought also exacted its toll on transmission pipelines. Now Berkeley Lab has been awarded $4.6 million by the California Energy Commission for two projects aimed at improving the safety and reliability of the state’s natural gas system.

<p>In this atomic-scale illustration, trace amounts of oxygen (red)  just beneath a copper (blue) surface, play a key role in driving a catalytic reaction in which carbon dioxide (black and red molecules) and water (red and white molecules) interact in the beginning stages of forming ethanol. Carbon dioxide molecules hover at the copper surface and then bend to accept hydrogen atoms from the water molecules. X-ray experiments at Berkeley Lab&#8217;s Advanced Light Source helped researchers to understand the role of subsurface oxygen in this process. (Credit: Berkeley Lab)</p>

Researchers Find a Surprise Just Beneath the Surface in Carbon Dioxide Experiment

X-ray experiments at Berkeley Lab, coupled with theoretical work, revealed how oxygen atoms embedded very near the surface of a copper sample had a more dramatic effect on the early stages of a reaction with carbon dioxide than earlier theories could account for. This work could prove useful in designing new types of materials to make reactions more efficient in converting carbon dioxide into liquid fuels and other products.