Tag: "tail" at biology news

'Dual Control' Strategy Assures Accurate Cellular Marching Orders, But A Pathogenic Microbe Can Hijack The System

...t cells. It uses this engine to power arocket-like tail and propel itself along a route of infection from one cell tothe next. By studying the three-dimensional structure of a mouse organizing protein called"Enabled" and analyzing its chemical interactions with one of Listeria'sproteins, the UCSF scientis...

Media Advisory: 1999 Spring Meeting -- Updated Press Conference Schedule

...nar gas was "gravitationallyfocused" into a narrow tail that was photographed using a sensitive camera atthe Boston University Station, McDonald Observatory, in Fort Davis, Texas.Experimental results and computer animations will be presented by researchersfrom the BU Center for Space Physics. Participants...

Robotic Fish

...a a desktop computer. Thiscontrols movement of the tail fin and two pectoral fins. "It wasn't possible toreplicate the exact method of propulsion used by the sea bream," says Mitsubishirobotics engineer Yuuji Terada. "So we're using an elastic oscillating fin thatwe first developed for use in our underwat...

Discovery of new bird species in China, oldest beak shows evolution complexity

...s ago. Males of both species bore two long tail plumes indicating the sexesdiffered significantly from each other. Like its cousin, the new bird C. duialso grew asymmetric wing feathers characteristic of all modern flying birds.Ostriches and other birds that can't fly well sprout nearly symmetric ...

Computers use Darwinian model to 'evolve' fuel additives

... and they continue to breed. Their head,linker and tail sections are recombined, and so on, until a final "generation"of highest-performing additives is reached. Fuel additives are needed to reduce deposits, left over from the combustionof gasoline, that build up on engine valves. The deposits eventua...

Geologists at UNC-CH discover state's 'most spectacular' fossils

...eaturecalled Aetosarus that had a pointed nose and tail and looked like "a littlestreamlined armadillo." ...aped the area, also destroying part of the hip and tail before Coffey foundthe first bones. Previously, the most famous North American rauisuchian, ...

Researchers pinpoint chemical signal that speeds mating process

...k." In this phase, the female straddlesthe male's tail while they both walk forward together. The male periodicallypauses to rub or slap his mental gland on the female to deliver his chemicalmessage. If all goes well, the male will deposit a spermatophore (sperm massresting on a gelatinous base) on the...

Giant plant-eating dinosaur found; two cast skeletons to be unveiled

...osed of only 12 vertebrae. Jobaria's backbone and tail are simple, compared with the complex vertebrae and whiplash tail of the older North American sauropods Diplodocus and Apatosaurus. "Jobaria is a real survivor, a re...

Zebrafish's powerful heart gene could lead to transplant therapy

...a two-chambered beating heart, ears and eyes and a tail thatflicks. By the third day, all of its major organs have fully developed andmoved into proper position, offering scientists a view of what has beenreferred to as the zebrafish's "artful etchings." (See images, below.) Less dramatic but of great imp...

Smell, taste may influence lifespan of the roundworm C. elegans

...ir study by mutating various genes in the head and tail that areneeded for the animals to smell and taste correctly - either genes that make cilia, the tips of thesensory neurons that respond to substances in the environment, or genes that are required for the actof smelling and tasting. The altered worm...

Mouse embryo hints at how mammalian body forms

... forming two poles, signifying the future head and tail regions. From there, cell migration continues to form the front and back and ultimately to generate the various organs. It is this process that ultimately gives rise to the jumping legs of frogs, the wings of butterflies and the arms and legs of ...

Road dust: Rural vehicles emit more pollutants than urban ones

...the suspended fine particulate matter created from tail pipe emissions. It is a major significant compon... challenges. It's more than your car's tail pipe that contributes to vehicular air pollution. "Emissions come from the tail pipe, from brake ...

Transgenic fish could threaten wild populations

...he male bird of paradisewith the longest, thickest tail attracts the most females. Subsequent offspring also exhibit the longtail and also compete well for females. Unfortunately, the birds with the biggest tails also have thebiggest problem escaping predators who appreciate large birds pinned in place by...

Scientists discover 66-million-year-old dinosaur with a heart

...its skull, spinal column, ribs and sections of the tail are partially exposed. The left side and extremities were lost to erosion. "We got lucky. If it hadn't been discovered when it was, it could all have eroded within six months," Russell says. He speculates Willo's soft tissues were preserved by a pro...

Advanced cell technology reports reversal

...lomeres and every time a cell divides some of this tail is used up. We thus eventually run out the aging clock until the cells in our bodies stop dividing. This cellular aging phenomenon is known as the "Hayflick Limit." "This study represents a milestone in our efforts to understand how mammalian longe...

Analysis of Martian meteorite using unique magnetic microscope

...g sound, a plume of cold helium gas forms, and the tail of microscope is covered instantaneously with ice. As long as nothing else breaks, its only an afternoons work to get back running. The pickup and the sapphire window are at the bottom of the cylindrical body of the microscope. To make a measu...

Secret to Listeria's virulence provides clues to workings of other deadly intracellular pathogens, UC Berkeley scientists report

...ey, and his colleagues reported details of how the tail is made. They found that the tail is produced when a protein on the surface of the bacteria, ActA, interacts with a complex of host ce...

Newly found bipedal reptile fossil predates dinosaurs by more than 60 million years

...mething like an upright lizard with forearms and a tail that more than doubles its body length, lived during the Permian period between 295 and 250 million years ago. Found in Germany in 1993, it is approximately 25 to 30 cm long and is preserved as a complete skeleton on a single slab of rock. According ...

Ancient running reptile was bipedal, say Science researchers

...g. The reptile also had an unusually long foot and tail These proportions are usually indicative of bipeda...urther lengthening its stride. The reptile's long tail could have served as a sort of rudder, compensating for changes in the animal's center of gravity du...

Female birds choose best singers to have smarter offspring

...vivability, he wondered about bigger and brighter tail feathers, for example, or complex songs that would seem to imperil animals by attracting predators. So Darwin proposed that a different process -- sexual selection -- is at work when potential mates are pairing up. Still, evolutionary biologists...

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