Genes reveal new clues about the first flower
...to use genes from mitochondria, which are known to evolve very slowly," dePamphilis says. "Several recent studies mixed mitochondrial gene sequences along with chloroplast and nuclear sequences, but we felt it would be important to analyze the three cellular components separately to guard against misleadin......ions adapt to different environments, songs should evolve in step with beak evolution," says Podos. Because ...s, was the first scientist to suggest that species evolve and diversify from common ancestors. The Galapagos finches have since remained a renowned study syst...Darwinian evolution of reproductive proteins in mammals
...when sperm meets egg and attempts fertilization -- evolve rapidly in a process driven by positive Darwinian selection, according to a Cornell University study. New statistical studies of sequence divergence among egg-surface and oviduct proteins, reported by Willie J. Swanson, Mariana F. Wolfner and Charle...Scientists find great-granddaddy of enzyme family
...time in evolution. "It takes time for sequences to evolve and diverge and the more divergent they are, the more likely that the proteins are an ancient family," Sanders says....The enemy of my enemy is my friend
...plants: 1) herbivorous insects rapidly evolve resistance to these defenses, which 2) allows the insects to sequester plant defenses and use them for their own defensive purposes; and 3) many direct defenses slow herbivore growth or digestive efficiency, causin...UW astrobiology research gets huge boost from $4.9 million NASA award
...which they examined the factors that allow life to evolve into advanced forms. They concluded that simple life is probably very common in the universe but that advanced life, even at the level of tube worms, is probably very rare and might be unique to Earth. "The grant application was tailored around 'Rare...Genes don`t control human behavior, evolutionist says
...ics evolve, but know little about how to make them evolve more rapidly. Interestingly, the business communit...them to." According to Ehrlich, "We must strive to evolve a new ethic that would have almost everyone put preserving humanity`s vital store of natural capital...Scientists sequence genome of strep throat, scarlet fever bacterium
...ongly suggests that bacteriophages can spur GAS to evolve into new and more dangerous strains, Dr. Ferretti says. The sequence information should aid efforts to develop vaccines against GAS, notes Dr. Rubin. NIAID-supported research has led to the development of several GAS vaccine candidates in various...What it means to be a mammal: New clues from tiny fossil described in Science
...rful chewing, says Luo. But did all these features evolve at once? Some of Hadrocodium 's contemporaries, early mammal-like species such as Sinoconodon and Morganucodon , possess the characteristic single jaw hinge of living mammals. But unlike Hadrocodium , these species don't show complete sepa...Evolution at a snail's pace: It's faster than you think
...ails in the repopulated area to the north began to evolve differently from their southern counterparts, most noticeably in the shape of their shells. Snails with a thicker, shorter and broader shell emerged. This new shell shape had not previously existed. The findings may give pause to scientists who...Scientists push enzyme evolution into high gear
...ciate evolution with improvement. But when enzymes evolve new functions, they almost always lose efficiency,...hought there might be a more direct way. "Could we evolve a better enzyme in the laboratory?" he asked. The method Shanklin and fellow Brookhaven biologist ...From flies to humans-ancient gene may be involved in male infertility
...eral years ago, illuminates the way in which genes evolve within and between species, taking on distinct functions in the process. BOULE, located on chromosome 2, and the Boule gene in the fly probably evolved, the researchers say, from a common ancestor. The fly Boule gene plays a critical role in meioti...Research team unlocks secrets of the firefly flash
...reflies (which are actually beetles, not flies) to evolve an elaborate courtship system based on flash communication, a kind of Personals Listing just for fireflies. "Fireflies are very romantic beasts," says Lewis, "because their whole adult life is spent courting." There are hundreds of different firefly...Researchers discover gene that could be key in evolution of hardwoods
..."But we thought it didn't make sense for plants to evolve new proteins and still use the old gene," Chiang said. "Our discovery of a syringyl-specific gene overturns that traditional model; it's been very exciting." The researchers also have identified two characteristics of syringyl lignin that could give ...Soil suggests early humans lived in forests instead of grasslands
...eliefs, beginning with Darwin, that humans did not evolve into upright beings and thrive until expanding tropical grasslands forced our chimpanzee-like ancestors out of dwindling forests about 4 million to 8 million years ago. Hominid fossil sites from the later Pliocene period (2.5 million to 4.2 million y...Digital organisms used to confirm evolutionary process
...ts," Lenski said. "Hence, we let some populations evolve at low and others at high mutation rates and examine the effects on growth and susceptibility to mutation." The digital organisms are comparable to computer viruses, "except digital organisms are harmless because their programs are meaningless outsi...A closer look at the genomes black holes
...the host genome, and so centromeric histones would evolve to restore parity between competing centromeres, Henikoff said. Bringing together incompatible centromeres and histones in hybrids would lead to their sterility or inviability. "Understanding the basis of the sterility of cross-species breeding has ...Fight between GMOS and the bugs they repel may not be over
...arned? explores speculation on whether pests will evolve to defend themselves from crops that produce defenses against them. Insects and mites already have proven deft at developing resistance to applied insecticides, with 540 arthropods resistant to more than 310 insecticides and miticides. These specula...Bizarre new protein blocks a real-life terminator
...vated TRAP.`` Evolution Why did B. subtilis> evolve such an elaborate and energetically costly mechanism for regulating tryptophan synthesis? ``It takes seven catalytic steps to synthesize tryptophan, making it one of the most expensive amino acids for an organism to produce, requiring large amounts ......t wriggles through the soil. C. elegans has had to evolve through geological time to cope with the challenges it faces from other soil dwelling organisms. Its ability to fend off a bacterial toxin, for example, has recently been shown to be affected by mutation in five different genes. Hodgkin suggests that...