News tagged with pollen grain
Early sunflower family fossil found in South America
(PhysOrg.com) -- A beautifully preserved fossil identified as being of an early relative of the Asteraceae, or aster, family nearly 50 million years old suggests the plant family, which has now colonized much ...
Other Sciences / Archaeology & Fossils
Sep 28, 2010 |
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Trapped dental 'calculus' holds clues to ancient human diets and health
Many ancient human teeth, including specimens tens of thousands of years old, still hold onto tiny pieces of food -- and even bacteria. Anthropologists are studying the tartar attached to ancient human teeth ...
Other Sciences / Archaeology & Fossils
May 31, 2012 |
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Scientists discover first ever record of insect pollination from 100 million years ago
Amber from Cretaceous deposits (110-105 my) in Northern Spain has revealed the first ever record of insect pollination. Scientists have discovered in two pieces of amber several specimens of tiny insects covered ...
May 14, 2012 |
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Clues on how flowering plants spread
(PhysOrg.com) -- Scientists have long scratched their heads over the Earth’s dazzling array of flowering plants. While conifers took 300 million years to yield hundreds of species, flowering plants diversified ...
Jun 21, 2011 |
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Biologists discover 'control center' for sperm production
Biologists at the University of Leicester have published results of a new study into the intricacies of sex in flowering plants.
Feb 02, 2011 |
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The production of plant pollen is regulated by several signalling pathways
(PhysOrg.com) -- Plants producing flower pollen must not leave anything to chance. The model plant thale cress (Arabidopsis), for instance, uses three signalling pathways in concert with partially overlapping ...
Jan 25, 2011 |
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Algae and pollen grains provide evidence of remarkably warm period in Antarctica's history
For Sophie Warny, LSU assistant professor of geology and geophysics and curator at the LSU Museum of Natural Science, years of patience in analyzing Antarctic samples with low fossil recovery finally led to a scientific breakthrough. ...
Space & Earth / Earth Sciences
Oct 01, 2009 |
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Scientist uses sedimentary record to uncover planet's past
(PhysOrg.com) -- The wind barreled across the ice at Daily Lake as Montana State University paleoecologist Cathy Whitlock and three students used all their strength to pull a metal pipe out of the mucky lake ...
Space & Earth / Earth Sciences
Feb 27, 2009 |
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Common eastern bumblebee can boost pumpkin yields
(PhysOrg.com) -- Each grinning jack-o'-lantern starts with yellow pollen grains, ferried from a male to a female pumpkin flower by bees. Honeybee populations are in decline, but Cornell entomologist Brian ...
Jul 06, 2011 |
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Female mate choice enhances offspring fitness in an annual herb
In many organisms females directly or indirectly select mates (or sperm) and potentially influence the fitness of their offspring. Mate choice and sexual selection in plants is more complex in some ways than ...
Jun 27, 2011 |
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Sex life of plants reveals conflicts between the sexes
The pollen grains of male plants live in great competition. A grain of pollen that succeeds in manipulating the flower’s pistil can emerge victorious from the struggle. This is shown by new research from Lund University in ...
May 08, 2009 |
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Pollen research not be sniffed at
Pollen may annoy allergy sufferers in springtime but, viewed under the microscope, a pollen grain is a thing of beauty. Amazing images and facts about pollen are part of an exhibition at CSIRO Discovery in Canberra beginning ...
Nov 29, 2011 |
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Experts 'baffled' by growing ranks of allergy sufferers
(PhysOrg.com) -- More Americans than ever are suffering from allergies. As spring allergy season approaches, expert Maya Jerath explains what researchers do -- and do not -- know about why we get them.
Feb 24, 2010 |
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Silencing of jumping genes in pollen
Scientists at the Instituto Gulbenkian de Ciência (IGC), in Portugal, are to date the only research group in the world capable of isolating the sperm cells in the pollen grain of the model plant Arabidopsis thaliana. This ...
Biology /
Feb 05, 2009 |
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