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Theories abound as to why organisms favour sexual reproduction, but testing these has been notoriously difficult. A common view is that sexual reproduction helps to reduce the effects of damaging mutations within a population. Now researchers from the Rockefeller University have tested this premise, using careful measurements of bacterial populations, and provide evidence against it. The research published today in Journal of Biology examines how mutant bacteria respond to different forms of
University of California, Berkeley’s RHESSI satellite, launched last year by NASA, was snapping X-ray pictures of solar flares in December when it caught an extremely bright background gamma-ray burst, revealing a novel physical feature of these gamma rays – their polarization.
The result sheds new light on the driving force behind these mysterious explosions.
Gamma-ray bursts are mysterious flashes of gamma-ray photons that pop off about once a day randomly in the sky, briefl
A new imaging technique that uses electron diffraction waves to improve both image resolution and sensitivity to small structures has been developed by scientists at the University of Illinois at Urbana-Champaign. The technique works on the same principle as X-ray diffraction, but can record structure from a single nanostructure or macromolecule.
Determining the structure of materials — such as protein crystals — is currently performed using X-ray diffraction. However, many small structur
An international team of astronomers headed by Dr. Michael Drinkwater (Queensland, Australia), Dr. Michael Gregg (Livermore, USA) and Dr. Michael Hilker from the University of Bonn has discovered a new kind of small, very compact galaxy. Their findings will be published in the next edition of the prestigious academic journal Nature on 29th May. This new type of galaxy could help to explain the discrepancy between observations and cosmological models.
The galaxies in our universe are not all
A new approach to providing medication for adult diabetics (type 2 diabetes) that is not dependent on insulin has been developed by a doctoral student at the Hebrew University of Jerusalem. For his work, which he did for his Ph.D. thesis in pharmacology, Arie Gruzman was awarded one of this year’s Kaye Innovation Awards at the Hebrew University.
Unlike other conventional drugs that require active insulin-producing cells in the pancreas and that often fail to overcome a companion problem of
Researchers at Washington University School of Medicine in St. Louis have begun unraveling the network of genes and proteins that regulate the lives of cells. The investigators compared the genome of the yeast Saccharomyces cerevisiae (S. cerevisiae) to those of five other yeast species to identify all the locations at which molecules known as regulatory proteins attach to DNA to turn genes on and off. The study is published in the May 30 issue of the journal Science.
Among the many potenti