Drilling cores from Switzerland have revealed the oldest known fossils of direct ancestors of flowering plants. These beautifully preserved 240-million-year-old pollen grains are evidence that flowering plants evolved 100 ...
Paleontology & Fossils
Oct 1, 2013
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Wits researchers have become the first to cut sections through pollen grains and make it possible to view a three dimensional image of the internal wall. This positions them to determine how the characteristics of the internal ...
Other
Sep 6, 2013
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Climate change may have driven the collapse of once-flourishing Eastern Mediterranean civilizations towards the end of the 13th century BC, according to research published August 14 in the open access journal PLOS ONE by ...
Earth Sciences
Aug 14, 2013
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Complicated statistical behaviour observed in complex systems such as early universe can often be understood if it is broken down into simpler ones. Two physicists, Petr Jizba (currently affiliated with the Czech Technical ...
General Physics
Jul 26, 2013
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Imagine an object was dropped in the stormy sea. It may be a life raft, a person overboard or a black box from an aircraft. One needs to find it, or at least predict where to search for it.
General Physics
Jun 28, 2013
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Millions of times on a spring day there is a dramatic biomolecular tango where the flower, rather than adorning a dancer's teeth, is the performer. In this dance, the female pistil leads, the male pollen tubes follow, and ...
Plants & Animals
Jun 20, 2013
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Sperm cell release can be triggered by tightening the grip around the delivery organ, according to a team of nano and microsystems engineers and plant biologists at the University of Montreal and Concordia University.
Cell & Microbiology
Apr 29, 2013
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Proteins are vital parts of living organisms, performing a variety of essential functions such as DNA replication, catabolizing reactions, and responding to stimuli. The complete set of proteins expressed in an organism at ...
Cell & Microbiology
Apr 10, 2013
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As a globally deployed force tasked with defending U.S. interests and delivering humanitarian assistance to international populations, the Department of Defense must be able to provide health care anywhere in the world at ...
Other
Nov 28, 2012
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During embryonic development in humans and other mammals, sperm and egg cells are essentially wiped clean of chemical modifications to DNA called epigenetic marks. They are then held in reserve to await fertilization.
Biotechnology
Sep 20, 2012
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