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| Biology articles |
Male voice pitch predicts reproductive success in hunter-gatherers
Deeper voice pitch predicts reproductive success in male hunter-gatherers, according to a new study from researchers with Harvard University, McMaster University, and Florida State University.
Beyond a 'speed limit' on mutations, species risk extinction
Harvard University scientists have identified a virtual "speed limit" on the rate of molecular evolution in organisms, and the magic number appears to be 6 mutations per genome per generation -- a level beyond which species run the strong risk of extinction as their genomes lose stability.
Green algae -- the nexus of plant/animal ancestry
Genes of a tiny, single-celled green alga called Chlamydomonas reinhardtii may contain scores more data about the common ancestry of plants and animals than the richest paleontological dig.
Scientists create interspecies rodent using embryonic stem cells
By injecting embryonic stem (ES) cells from a wood mouse into the early embryo of a house mouse, an international team of scientists has produced normal healthy animals made up of a mixture of cells from each of the two distantly related species. This is the first time that stem cells from one mammalian species have been shown to contribute extensively to development when introduced into the embryo of another, very different species.
Researchers mimic vascular system to nourish engineered tissue for transplants
One day soon, laboratories may grow synthetically engineered tissues such as muscle or cartilage needed for transplants. In a major step forward, Cornell engineers describe in the journal Nature Materials a microvascular system they have developed that can nourish growing tissues.
Fair play in chimpanzees
New research from the Max Planck Institute of Evolutionary Anthropology in Leipzig, Germany shows that unlike humans, chimpanzees conform to traditional economic models. The research, conducted by Keith Jensen, Josep Call and Michael Tomasello, used a modification of one of the most widely used and accepted economic tools, the ultimatum game.
How 'farmer' ants keep control of their food
Chemicals on ants' feet tranquilise and subdue colonies of aphids, keeping them close-by as a ready source of food. The study throws new light on the complex relationship between ants and the colonies of aphids whose sugary secretions the ants eat.
A gene divided reveals details of natural selection
In a molecular tour de force, researchers at the University of Wisconsin-Madison have provided an exquisitely detailed picture of natural selection as it occurs at the genetic level.
History of fibre development
Different kinds of fibres are available now-a-days. These fibres are mainly divided into two categories natural and man made. They are also categorized by the generations as they were produced in the different years and known as first generation
Fossilized cashew nuts reveal europe was important route between africa and south america
Cashew nut fossils have been identified in 47-million year old lake sediment in Germany, revealing that the cashew genus Anacardium was once distributed in Europe, remote from its modern "native" distribution in Central and South America.
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Elephants tell human friends from foes by scent and clothing color
Elephants are remarkably perceptive when it comes to recognizing specific ethnic groups of people that vary in the degree of danger they are likely to pose, reveals a new study published online on October 18th by Current Biology, a Cell Press publication.
Researchers studying how singing bats communicate
Bats are the most vocal mammals other than humans, and understanding how they communicate during their nocturnal outings could lead to better treatments for human speech disorders, say researchers at Texas A&M University.
Stem cell nuclei are soft 'hard drives'
Biophysicists at the University of Pennsylvania have discovered that the nuclei of human stem cells are particularly soft and flexible, rather than hard, making it easier for stem cells to migrate through the body and to adopt different shapes, but ultimately to put human genes in the correct nuclear "sector" for proper access and expression.
Genes that both extend life and protect against cancer identified
A person is 100 times more likely to get cancer at age 65 than at age 35. But new research reported in the journal "Nature Genetics" identifies naturally occurring processes that allow many genes to both slow aging and protect against cancer in the much-studied C. elegans roundworm.
Researchers posit new ideas about human migration from Asia to Smericas
Questions about human migration from Asia to the Americas have perplexed anthropologists for decades, but as scenarios about the peopling of the New World come and go, the big questions have remained. Do the ancestors of Native Americans derive from only a small number of "founders" who trekked to the Americas via the Bering land bridge? How did their migration to the New World proceed? What, if anything, did the climate have to do with their migration? And what took them so long?
Researchers identify natural herbicide that controls weeds around some common lawn grasses
Certain varieties of common fescue lawn grass come equipped with their own natural broad-spectrum herbicide that inhibits the growth of weeds and other plants around them.
Can you feel the heat? Your cilia can
Johns Hopkins researchers and colleagues have found a previously unrecognized role for tiny hair-like cell structures known as cilia: They help form our sense of touch.
St bernard study casts doubt on creationism
The St Bernard dog — named after the 11th century priest Bernard of Menthon — may, ironically, have challenged the theory of creationism, say scientists.
Scientist learns about humans machiavellian intelligence by looking at the behavior of monkeys
When it comes to their social behavior, people sometimes act like monkeys, or more specifically, like rhesus macaques, a type of monkey that shares with humans strong tendencies for nepotism and political maneuvering, according to research by Dario Maestripieri, an expert on primate behavior and an Associate Professor in Comparative Human Development and Evolutionary Biology at the University of Chicago.
Researchers view swimming tactics of tiny aquatic predators
By applying state-of-the-art holographic microscopy to a major marine biology challenge, researchers have identified the swimming and attack patterns of two tiny but deadly microbes linked to fish kills in the Chesapeake Bay and other waterways.
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| Quotes | By convention!
cussed Tom airily.
Cmon Scully... Itll be a nice trip through the woods-Fox Mulder
But what ... is it good for?
Engineer at IBM, 1968, commenting on the microchip.
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