rules
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Chemistry
Rules that can lead to electricity, colourful silicon
Test tubes containing new silicon copolymers separated by chain length provide visual evidence of various bandgaps in new semiconducting silicones, from long to short. When UV light shines, the length of the long chain shifts towards the red edge of the electromagnetic spectrum, creating a beaker rainbow, which absorbs and emits less energy at low energy. Credit: Zijing (Jackie) Zhang…
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Biology
Tunisia’s “Revolutionary Oasis” Palm Gloves thrive on their own rules
Tahar Ettahri: “We came together with the goal of improving the well-being of our community.” Residents of Gemna in southern Tunisia say their lives have improved radically since they fought over control of the 100-year-old palm groves from the province during the 2011 revolution. The desert town (where the palm produces some of the best dates of North African countries)…
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Other Sciences
Philadelphia Spanish speakers break traditional rules of formal and informal speech with signs around town
The Spanish signs of Philadelphia contradict the grammatical lessons that most of us have been taught. Credit: Daniel Guarin Buitrago, CC BY-ND I have found fascinating about how Philadelphia Spanish speakers deal with each other and communicate through public indications. This finding is part of my research on Philadelphia language patterns, challenging what many students have learned in Spanish classes.…
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Nanotechnology
Diversifying DNA origami: Generative design tools rely on grammatical rules to find optimal shapes
(A) The grammar rules in this work include triangulation of surface meshes. The distance d and rotation angle θ are user-defined values. (B) Grammar rules are randomly sampled and applied to evolve the design solution sn during the generation process. Credit: Nucleic Acids Research (2024). DOI: 10.1093/nar/gkae1268 As the name suggests, DNA origami is a fabrication technique in which researchers…
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Environment
Environmental groups challenge updates to California’s low-carbon transportation rules
Credit: Pixabay/CC0 Public Domain A coalition of environmental groups filed a challenge Wednesday to California’s main climate regulator, arguing that recent updates to a major climate change program will cause more pollution in the state’s San Joaquin Valley. The lawsuit, filed in Fresno County Superior Court, requires the California Air Resources Board to “adequately disclose, analyze, and mitigate the significant…
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Chemistry
Chemists say it’s time to break 100-year-old rules and rewrite textbooks
Credit: Pixabay/CC0 Public Domain Chemists at UCLA have discovered a big problem with the basic rules of organic chemistry that have existed for 100 years. That’s not true at all. And they say, “It’s time to rewrite the textbooks.” Organic molecules are primarily composed of carbon and are characterized by having a specific shape and arrangement of atoms. Molecules known…
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Science
US finalizes rules to remove lead pipes within 10 years
Credit: Pixabay/CC0 Public Domain President Joe Biden’s administration on Tuesday finalized a rule requiring the nation’s remaining lead pipes to be removed within 10 years. This is a measure aimed at preventing millions of people from being exposed to toxic metals linked to childhood developmental delays. The policy is a cornerstone of the White House’s environmental justice efforts, as traditional…
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