Tag: "migration" at biology news

Human migration tracked in Stanford computer simulation

...ic villages realistic rates for population growth, migration and mutations. The inhabitants had more than one c...a mutation appeared in a person at the edge of the migration front where the population was scarce, the mutation was more likely to spread through the population...

To avoid detection, HIV disrupts immune cell migration

... and Rac2) that are required for normal lymphocyte migration and antigen-specific responses. ELMO1 has also been shown to help DOCK2 activate Rac. Because DOCK2 activates Rac as part of two different signaling pathways--one activated by the T cell receptor, which mediates T cell activation, and one by a chemok...

Understanding urinary tract infections

...ction. Linked to poor hygiene, sexual behavior and migration of intestinal flora, they are believed to cause around $1.6 billion in medical expenses every year in the United States. Scientists estimate half of all women will experience a UTI at some point in their lives, and additional recurrent UTIs will affe...

Scientist challenges interpretation of new find, the oldest primate fossil ever discovered

...l. Until recently, scientists believed that direct migration of primates between Asia and Europe around 55 million years ago would not have been possible due to a transcontinental marine barrier that ran from north to south down the middle of Eurasia at the time. Now, the presence of closely related Teilhardin...

New roles for protein modifications in cell migration

...ce in new tissues and organs. The guidance of cell migration is achieved by signals intrinsic to the cell or fr...modification known as glycosylation in guiding the migration of gonadal cells in the nematode, C. elegans. This study, conducted in collaboration with researche...

JCI table of contents, December 15 2003

...ment by secreting Kit ligand, which stimulates the migration of mast cells and neurofibroma formation. In an accompanying commentary, David Viskochil from the University of Utah explores the mechanisms of these cellular interactions and suggests that "the development of medical treatment targeted to mast ce...

Symbiotic fungi promote invasion into diverse plant communities (Rudgers et al.)

...ay have carry-over effects during northward spring migration and reproduction. In the January issue of Ecology Letters, Saino, Szp, Romano, Rubolini, and Mller analyse the effect of ecological conditions in the winter quarters on timing of arrival of barn swallows (Hirundo rustica) to their Italian breeding gr...

Bird 'breathalyzer' helps assess migratory diet

...st where birds stop to feed during their southward migration each fall. He captures yellow-rumped warblers, wh...white-throated sparrows switched their diet during migration from insects and berries to corn, suggesting that the birds ate at bird feeders. This raises questi...

By the year 2050, human population could add 2.6 billion people, reports Rockefeller scientist

...e more elderly. However, exactly how international migration and family structures will change demographers cannot say. "I also do not know whether we will inflict a doomsday on ourselves by warfare, disease or catastrophe. Our future depends on choices -- on the choices we have made in the past and those we w...

Study predicts loss of monarch winter refuges

...y aren't too wet, the insects survive to begin the migration north in the spring. But the knowledge that the earth is facing climate changes prompted Oberhauser and colleague A. Townsend Peterson of the University of Kansas to determine whether future winter conditions in the Mexican refuges would continue to ...

Some re-established elk herds lack genetic diversity of ancestors

... a host of population parameters, including animal migration patterns, parentage in animal populations, and, like Rhodes, the genetic history of groups of reintroduced animals. The extremely limited microsatellite variation Rhodes and his colleagues found among elk in Pennsylvania and California confirms that ...

Isotopes from feathers reveal bird migration

...ity of Alberta and his colleagues are tracking the migration routes of birds of prey. Their work on the summer...est sites. Then they gather feathers from birds on migration or on their wintering grounds to trace them back to the isotope baseline based on the nestlings. In ...

Gene-expression atlas will provide new direction for brain and spinal-cord studies

...and molecules that enable researchers to trace the migration of neural cells during development of the brain and spinal cord. Heintz and his colleagues also hope that data from the atlas will enable better functional analyses of neural circuitry by permitting researchers to manipulate individual circuits in th...

How many fish in the sea? Census of Marine Life launches first report

...unicate with satellites, enabling documentation of migration patterns. Similar technology has recorded trans-P.... Use of electronic tagging technologies to study migration patterns and behaviors of large open-ocean animals and the oceanographic factors that influence them...

JCI table of contents, 15 October, 2003

...infection, vascular endothelial cells regulate the migration of polymorphonuclear neutrophils (PMNs) to the sit...g and subsequent TLR2 activation in amplifying the migration of PMNs to the sites of infection. TITLE: TLR4 signaling induces TLR2 expression in endothelial c...

Mark your calendar for the American Anthropological Association meeting in Chicago Nov. 19-23

...rified World. This panel explores how forced labor migration and trafficking are shifting in response to new se...ge to understanding human evolution and population migration across the world. Panel includes Theodore Schurr and George Armelagos. (Friday 1.45-3.30) Language o...

JCI Table of Contents, 1 October, 2003

... the inflamed and injured area. Inhibition of this migration has long been an attractive, though challenging, b...is for anti-inflammatory treatment strategies. The migration is regulated, in part, by the proteins E-selectin and P-selectin present within endothelial cells of...

UCR geneticist spells out consequences of genetically engineered genes escaping into wild species

...s on the trail of a little-noticed phenomenon, the migration of plant genes across the boundaries of farmers' fields. He provides a comprehensive and even-tempered look at an old phenomenon that has suddenly acquired new relevance in this era of genetically engineered crops. An essential guide to a fascinati...

Louis Leakey Centennial Tribute

...lore such topics as the earliest human technology, migration out of Africa, a Neanderthal's diet, and the evolutionary significance of mothers and grandmothers....

'Stop leak' solution found for toxicity problems in experimental gene therapy

...ly to the liver. The reason for that unanticipated migration was tumor blood vessel damage by the injection needle, Yuan said. After entering those vessels through the tiny wounds, viruses could quickly migrate through the entire interconnected bloodstream. Identifying the problem, the Duke researchers also di...

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