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| Biology articles |
Researchers evolve a complex genetic trait in the laboratory
Duke University biologists have evolved a complex trait in the laboratory -- using the pressure of selection to induce tobacco hornworms to evolve the dual trait of turning black or green depending on the temperature during their development. The biologists have also demonstrated the basic hormonal mechanism underlying the evolution of such dual traits.
Increased competition for pollen may lead to plant extinctions
The decline of birds, bees and other pollinators in the world's most diverse ecosystems may be putting plants in those areas at risk, according to new research.
Like their pregnant mates, primate dads-to-be pack on pounds
Confirming what many have long suspected, scientists have found that male monkeys of two different species get heavier when their mates are pregnant.
New images capture virus in extraordinary detail
Fifty years after MIT researchers pioneered the use of electron microscopy to study viruses, MIT scientists have helped produce the most detailed images yet of the tiny infectious agents.
Less is more, gene study shows
Humans and chimps share most of their genes, yet they differ dramatically in many ways-their walk, the sizes of their brains and their capacities for speech and language, for example. Scientists would like to know how and when such differences arose, and new research from the University of Michigan shows how one process-gene loss-may have figured in.
New clues in the plant mating mystery
New data suggest that molecular communication between the plant sexes--specifically the pollen of males and pistils of females--is more complicated than originally thought.
Phytoplankton bounce back from abrupt climate change - from space
The majority of tiny marine plants weathered the abrupt climate changes that occurred in Earth's past and bounced back, according to a Penn State geoscientist.
Researchers discover key factor for survival of human embryonic stem cells
Human embryonic stem cells (hES) offer great hope for the treatment of some devastating diseases, but finding a way to keep enough of these cells usable and healthy for transplantation in patients has been an ongoing problem. Now, scientists at UC Irvine have discovered a way to keep large quantities of these cells alive, a finding that could potentially lead to mass production of hES cells for therapeutic use at lower cost.
Hens' Teeth not so rare after all
Scientists have discovered that rarest of things: a chicken with teeth - crocodile teeth to be precise. Contrary to the well-known phrase, 'As rare as hens' teeth,' the researchers say they have found a naturally occurring mutant chicken called Talpid that has a complete set of ivories.
First direct evidence of 2-way conversations between malignant, normal cells
For more than seven decades, scientists have had tantalizing clues that cancer cells and neighboring non-cancerous cells in the body communicate with one another. It now emerges that this dialog may explain the clinical observation that cancer cells grow to make secondary tumors (metastasize) in some organs of the body and not others. Findings suggest that this may also have therapeutic implications.
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Bacterium found to have strange magnetic personality
Researchers led by an MIT graduate student have discovered a bacterium that is a magnetic misfit of sorts.
Flapping insect uses drag to carry its weight
If mastering flight is your goal, you can't do better than to emulate a dragonfly. With four wings instead of the standard two and an unusual pitching stroke that allows the bug to hover and even shift into reverse, the slender, elegant insect is a marvel of engineering.
Amber reveals ecology of 30 million year old spiders
Scientists at The University of Manchester and the Manchester Metropolitan University have carried out the first comparative scientific study of ancient spiders trapped in amber more than 30 millions years ago.
Researchers find ways heat-loving microbes release energy
Curiosity about the microbial world drove Jan Amend, Ph.D., associate professor of earth and planetary sciences in Arts & Sciences at Washington University in St. Louis, to Vulcano Island, Italy, a shallow hydrothermal Shangri-la near Sicily. There, Amend and his collaborators managed to examine the environment in depth, design a gene probe, and discover new life-which could have some big implications for the origin and presence of life on Earth.
Predators keep the world green
Predators are, ironically, the key to keeping the world green, because they keep the numbers of plant-eating herbivores under control, reports a research team lead by John Terborgh, a professor of environmental science at Duke University's Nicholas School of the Environment and Earth Sciences.
Mit method reveals how radiation damages the body
Researchers at MIT have devised a new method for examining how radiation damages normal tissue in the body. The knowledge may make it possible to reduce side effects for cancer patients or to develop treatments for radiation exposure.
Infection alarm yields clues to immune system behavior
Drawing on lab experiments and computer studies, Johns Hopkins researchers have learned how a common protein delivers its warning message to cells when an infectious agent invades the body.
Undersea microbes active but living on the slow side
Deeply buried ocean sediments may house populations of tiny organisms that have extremely low maintenance energy needs and population turnover rates of anywhere from 200 to 2,000 years, according to an international team of researchers.
Early land animals could walk and run like mammals
Salamanders and the tuatara, a lizard-like animal that has lived on Earth for 225 million years, were the first vertebrates to walk and run on land, according to a recent study by Ohio University researchers.
Most human-chimp differences due to gene regulation-no genes
The vast differences between humans and chimpanzees are due more to changes in gene regulation than differences in individual genes themselves, researchers from Yale, the University of Chicago, and the Hall Institute in Parkville, Victoria, Australia, argue in the 9 March 2006 issue of the journal Nature.
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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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