In the 1960s, Penn biologist Dan Janzen, as part of earning his Ph.D., re-described what has become a classic example of biological mutualism: the obligate relationship between acacia-ants and ant-acacia trees. The acacia trees produce specialized structures to shelter and feed the ant colony, and the ants, in turn, defend the tree against herbivores.
Researchers have discovered a new species of tree in the Usambara Mountains in Tanzania, part of the Eastern Arc Mountains, and a globally important region for species in need of conservation.
Gaku Kudo of Hokkaido University and Elisabeth J. Cooper of the Arctic University of Norway have demonstrated that early snowmelt results in the spring ephemeral Corydalis ambigua flowering ahead of the emergence of its pollinator, the bumblebee.
Rising temperatures could mean no male loggerhead turtles hatch at a key breeding ground by the end of this century, new research suggests.
The acidification of the oceans is recorded in the crystals of the coral skeleton. This is a new tool for studying past environmental changes and combating climate change. Such is the main conclusion of a study led by the Spanish scientist Ismael Coronado Vila, from the Institute of Paleobiology in Warsaw (Poland).
An epigenetic change, a form of DNA control, that deactivates some genes linked to cancer late in human development has been conserved for more than 400 million years, new research led by the Garvan Institute of Medical Research suggests.
Stem cells self-renew and give rise to cells that are differentiated during development. These differentiated cells can change into stem cells under appropriate conditions in most plants, in which this process is more readily apparent, and some animals. Researchers have previously succeeded in forming new shoots from intact leaves by inducing single transcription factors in Arabidopsis.
The most extensive and systematic insect monitoring program ever undertaken in North America shows that butterfly abundance in Ohio declined yearly by 2%, resulting in an overall 33% drop for the 21 years of the program.
A University of Otago-led study is heralding advances in our understanding of one of the most startling transformations in the natural world - the complete reversal of sex that occurs in about 500 species of fish.
Coral reefs are retreating from equatorial waters and establishing new reefs in more temperate regions, according to new research in the journal Marine Ecology Progress Series. The researchers found that the number of young corals on tropical reefs has declined by 85 percent - and doubled on subtropical reefs - during the last four decades.
UC Riverside scientists have decoded the genome of black-eyed peas, offering hope for feeding Earth's expanding population, especially as the climate changes.
'Grandmother, why do you have such big ears?' is one of the most well-known questions in literature, posed of course by Red Riding Hood as she hesitantly observes the wolf dressed in her Grandmother's clothes. Had Red Riding Hood been a physicist, she might well have asked: 'Grandmother, why are your two ears exactly the same length?' Scientists have been aware of this 'length problem' for a long time, but it was largely overlooked for most of the twentieth century.
Thanks to super-resolution microscopy, scientists have now been able to unambiguously identify physical associations between human chromosomes. The findings have brought to light a new understanding of a curious observation first made more than 50 years ago.
Scientists led by the USF College of Marine Science used NASA satellite observations to discover the largest bloom of macroalgae in the world called the Great Atlantic Sargassum Belt (GASB), as reported in Science.
In a world first, scientists have found a new way to direct stem cells to heart tissue. The findings, led by researchers at the University of Bristol and published in Chemical Science, could radically improve the treatment for cardiovascular disease, which causes more than a quarter of all deaths in the UK (1).