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Keyword: nucleus

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  • Moving DNA to a different part of the nucleus can change how it works

    10/12/2018 10:28:35 AM PDT · by ETL · 13 replies
    ScienceMag.com ^ | Oct 11, 2018 | Elizabeth Pennisi
    Though the 3 meters of DNA inside the nuclei of our cells looks like a jumbled pile of spaghetti, the genome is, in fact, pretty well organized. Now, scientists have discovered—using a modified version of the gene-editing tool CRISPR—that the location of DNA, not just the order of its base pairs, can make a critical difference in how certain parts of the genome work. The nucleus is dynamic, with everything—the chromosomes, the nucleolus, and so on—swirling around seemingly randomly. But in the past decade, researchers have realized that DNA on chromosomes inside can reposition itself in specific ways, ways that...
  • Cell Motors Play Together (in symphony)

    03/02/2009 6:48:59 PM PST · by GodGunsGuts · 8 replies · 532+ views
    CEH ^ | Febraury 27, 2009
    Cell Motors Play Together Feb 27, 2009— If one molecular machine by itself is a wonder, what would you think of groups of them playing in concert?  Recent papers and news articles are claiming that’s what happens in living cells: molecular motors coordinate their efforts...
  • Cosmic ray mystery solved?

    11/12/2007 1:12:47 PM PST · by LibWhacker · 30 replies · 105+ views
    Universe's most energetic particles point to huge black holesThe most energetic particles in the universe – ultrahigh-energy cosmic rays – likely come from supermassive black holes in the hearts of nearby active galaxies, says a study by scientists from nearly 90 research institutions worldwide, including the University of Utah. “We discovered the sources of the highest energy particles in the universe,” says Miguel Mostafa, an assistant professor of physics at the University of Utah and one of 370 scientists and engineers belonging to a 17-nation collaboration that operates the $54 million Pierre Auger Observatory in Argentina. “The sources are the...
  • Astronomy Picture of the Day 11-21-02

    11/21/2002 1:05:50 PM PST · by petuniasevan · 4 replies · 267+ views
    NASA ^ | 11-21-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 November 21 Starburst Galaxy M94 Credit & Copyright: Hillary Mathis & N.A.Sharp (NOAO), AURA, NSF Explanation: What could cause the center of M94 to be so bright? Spiral galaxy M94 has a ring of newly formed stars surrounding its nucleus, giving it not only an unusual appearance but also a strong interior glow. A leading progenitor hypothesis holds that an elongated knot of stars known as a...
  • Astronomy Picture of the Day 8-4-02

    08/03/2002 10:54:41 PM PDT · by petuniasevan · 11 replies · 354+ views
    NASA ^ | 8-04-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 August 4 Spiral Galaxy NGC 2997 from VLT Credit: FORS Team, 8.2-meter VLT, ESO Explanation: NGC 2997 is a grand design spiral galaxy. Its small nucleus and sprawling spiral arms give it a type Sc designation. NGC 2997, pictured above, is speeding away from us at about 1100 kilometers per second, which would place it at about 55 million light years distant, given current estimates of the...
  • Astronomy Picture of the Day 8-02-02

    08/01/2002 10:54:25 PM PDT · by petuniasevan · 8 replies · 415+ views
    NASA ^ | 8-02-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 August 2 Comet 57P Falls to Pieces Credit: Y. Fernández, S. Sheppard, D. Jewitt (University of Hawai`i) Explanation: Comet 57P has fallen to pieces, at least 19 of them. Orbiting the Sun every 5.9 years or so this faint comet - also christened Comet 57P/du Toit-Neujmin-Delporte for its three 1941 co-discoverers - is simply 57th on the list of comets known to be periodic, beginning with Comet...
  • Astronomy Picture of the Day 7-21-02

    07/21/2002 3:21:43 AM PDT · by petuniasevan · 6 replies · 414+ views
    NASA ^ | 7-21-02 | Robert Nemiroff and Jerry Bonnell
    Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 July 21 Nearby Spiral Galaxy NGC 4945 Credit: 2P2 Team, WFI, MPG/ESO 2.2-m Telescope, La Silla, ESO Explanation: For such a close galaxy, NGC 4945 is easy to miss. NGC 4945 is a spiral galaxy in the Centaurus Group of galaxies, located only six times farther away than the prominent Andromeda Galaxy. The thin disk galaxy is oriented nearly edge-on, however, and shrouded in dark dust. Therefore...
  • Faulty Genes Explain Why Cloning Is So Difficult

    05/27/2002 4:26:09 PM PDT · by petuniasevan · 21 replies · 1,258+ views
    Faulty Genes Explain Why Cloning Is So DifficultMon May 27, 3:07 PM ETCloning may not always completely reprogramme an egg cell the way sexual reproduction does, which might explain why the process fails more often than it works, experts say. Dolly, the world's first cloned animal, stands in her pen at the Roslin Institute in Edinburgh in this February 23, 1997, file photo. REUTERS WASHINGTON (Reuters) - Cloning may not always completely reprogram an egg cell the way sexual reproduction does, which would explain why the process fails so often, researchers reported on Monday. While lawmakers around the world debate...