Life starts with one cell. When an organism develops, dividing cells specialize to form the variety of tissues and organs that build up the adult body, while keeping the same genetic material – contained in our DNA.
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In this series of images, purified bacterial transcription factor in solution acts like a fluid by condensing into spherical droplets that then fuse together. Researchers are studying whether condensates might play a role in regulating bacterial cells as well as eukaryotic ones.
James Wall
Last summer, Weber published a study showing that in cells of slow-growing
E. coli bacteria, the RNA polymerase enzyme is uniformly distributed, but in fast-growing cells it clusters in droplets. The fast-growing cells may need to concentrate the polymerase around ribosomal genes to synthesize ribosomal RNA efficiently.
âIt looks like it [phase separation] is in all domains of life, and a universal mechanism that has then been able to specialize into a whole bunch of different functions,â Weber said.
this program is made possible by contributions to your pbs station from viewers like you. captioning sponsored by wpbt tom: good evening everyone. thanks for watching. susie gharib is off tonight. energy prices moved higher as temperatures in most of the country remain low. oil rose 49 cents in new york trading today to settle at $91.49 a barrel. during the trading day, oil hit its highest price since the fall of 2008. in just a moment, we ll hear from former shell oil president john hofmeister on why he thinks gas prices are heading for $5 a gallon. he s not the only one who thinks we ll be paying a lot more for energy soon. erika miller talked with experts who predict higher energy prices in the new year. reporter: anthony grisanti has been trading oil at the new york mercantile exchange for more than 20 years, so he is used to unpredictable moves in energy prices. but even grisanti is baffled by the recent rise in gasoline prices at both the wholesale and retail levels