Corals that withstood a severe bleaching event and were transplanted to a different reef maintained their resilient qualities, according to a new study led by Katie Barott of the University of Pennsylvania.
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Menefeeceratops sealeyi adds important information to scientists’ understanding of the evolution of ceratopsid dinosaurs, which are characterized by horns and frills, along with beaked faces. In particular, the discovery sheds light on the centrosaurine subfamily of horned dinosaurs, of which
Menefeeceratops is believed to be the oldest member. Its remains offer a clearer picture of the group’s evolutionary path before it went extinct at the end of the Cretaceous.
Steven Jasinski, who recently completed his Ph.D. in Penn’s Department of Earth and Environmental Science in the School of Arts & Sciences, and Peter Dodson of the School of Veterinary Medicine and Penn Arts & Sciences, collaborated on the work, which was led by Sebastian Dalman of the New Mexico Museum of Natural History and Science. Spencer Lucas and Asher Lichtig of the New Mexico Museum of Natural History and Science in Albuquerque were also part of the research team.
Mothers bear the cost of the pandemic shift to remote work upenn.edu - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from upenn.edu Daily Mail and Mail on Sunday newspapers.
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Many genetic mutations have been found to be associated with a person s risk of developing Parkinson s disease. Yet for most of these variants, the mechanism through which they act remains unclear.
Now a new study in
Nature led by a team from the University of Pennsylvania has revealed how two different variations one that increases disease risk and leads to more severe disease in people who develop Parkinson s and another that reduces risk manifest in the body.
The work, led by Dejian Ren, a professor in the School of Arts & Sciences Department of Biology, showed that the variation that raises disease risk, which about 17% of people possess, causes a reduction in function of an ion channel in cellular organelles called lysosomes, also known as cells waste removal and recycling centers. Meanwhile, a different variation that reduces Parkinson s disease risk by about 20% and is present in 7% of the general population enhances the activity of the same ion channel.
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IMAGE: Using an experimental technique whereby flowers can be coaxed to form from plant roots, biologists led by the University of Pennsylvania s Doris Wagner uncovered a protein that enables for the. view more
Credit: University of Pennsylvania
Cells don t express all the genes they contain all the time. The portion of our genome that encodes eye color, for example, doesn t need to be turned on in liver cells. In plants, genes encoding the structure of a flower can be turned off in cells that will form a leaf.
These unneeded genes are kept from becoming active by being stowed in dense chromatin, a tightly packed bundle of genetic material laced with proteins.