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If one were to take a liquid — any liquid — and cool it down rapidly enough so that it doesn’t have a chance to crystallize, the result would be glass. Glass is so viscous that it takes too long to flow for anyone to realize that it is liquid rather than solid.
Every time a hormone is released from a cell, every time a neurotransmitter leaps across a synapse to relay a message from one neuron to another, the cell must undergo exocytosis. This is the process responsible for transporting cellular contents via lipid-encapsulated vesicles to the cell surface membrane and then incorporating or secreting them through membrane fusion.
If you held a ball up to a mirror, it would produce an image that, if pulled out, would sit perfectly on top of the ball. Yet if you held your right hand up to a mirror, the image produced would be a left hand, which is not identical to the original; a glove for one hand cannot comfortably fit the other.
Viruses and their hosts are in a eternal game of one-upmanship. If a host cell evolves a way to stop a virus from spreading, the virus will look for a new path. And so on and so forth.
The University of Pennsylvania’s Lauren Sallan, an assistant professor in the School of Arts & Sciences’ Department of Earth and Environmental Science, has been selected as a
At 7 years old, Arabella Uhry, now a junior at the University of Pennsylvania, developed a relationship that sparked her interest in health care.
It’s well known that, when cells are subject to stress, starvation or viral infection, they sometimes adopt a cubic architecture. Unlike the simple spherical structure of membranes in healthy cells, these cubic membranes, or cubosomes, are very complex, forming an interconnected network of water channels resembling a “plumber’s nightmare.”
The round worm Caenorhabditis elegans, a nematode, is a puzzling creature.
Mitochondria, the mighty energy factories of the cell, often malfunction in cancer, as well as in other conditions such as aging, neurodegenerative disease and heart disease. Whether these changes in mitochondria actually contribute to the spread of cancer, however, has been controversial.
More than 90 percent of acute care hospitals and more than 75 percent of office-based physicians use electronic health records, or digital versions of patient charts, typi
Michael Mann of the School of Arts & Sciences says that many people blaming cloud seeding for Dubai storms are climate change deniers trying to divert attention from what’s really happening.
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Chris Callison-Burch of the School of Engineering and Applied Science says that auto-regressive generation can make it difficult for language learning models to perform fact-based or symbolic reasoning.
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Michael Mann of the School of Arts & Sciences says that persistent summer weather extremes like heat waves are becoming more common as people continue to warm the planet with carbon pollution.
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Benjamin Lee of the School of Engineering and Applied Science says that the electrical grid will have to figure out how to match supply and demand during brief windows where the energy source goes away.
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Michael Mann of the School of Arts & Sciences says that tendencies to exaggerate climate science in favor of “doomist” narratives helps no one except the fossil fuel industry.
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Michael Mann of the School of Arts & Sciences says that plant-flowering, tree-leafing, and egg-hatching are all markers associated with spring that are happening sooner.
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A lab at the School of Engineering and Applied Science led the development of a COVID test made from bacterial cellulose, an organic compound.
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Danny Cullenward of the Kleinman Center for Energy Policy at the Weitzman School of Design says that federal and California state subsidies have led to a gold rush of companies trying to get into the business of renewable natural gas around the country.
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Joseph Romm of the School of Arts & Sciences says that stronger action against fossil fuels is essential to save the planet.
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The Raj and Neera Singh Program in Artificial Intelligence at Penn will be the first AI undergraduate engineering major at an Ivy League school, led by George Pappas of the School of Engineering and Applied Science.
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