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Tag: "circles" at biology news

How to look at dinosaur tracks

... erosion may expose prominent layers of concentric circles extending from the former location of the true track. These “undertracks?reveal the squishing and displacement of sand when the heavy dinosaur took a step. “The tracks and undertracks of large theropods found in the [Middle Jurassic] Entrada Sands...

Will the plague pathogen become resistant to antibiotics?

...nce (MDR) sequences, is carried on plasmids, small circles of DNA that are passed easily between bacteria. In this study, the same MDR plasmids found in the Y. pestis from Madagascar were also present in bacteria such as Salmonella and Escherichia coli found in retail samples of beef, pork, chicken, and turk...

The brain's motivation station

...olved presenting the subjects with such symbols as circles or squares that indicated an amount of money the subjects could gain or lose--from no money to $5--by rapidly responding to a subsequently presented target by pressing a button. The subjects were notified immediately whether they had received the rew...

Fire ants: Their true story told by the scientist who loves them

...n Belt via 1940s Mobile, Ala., is known in biology circles as Solenopsis invicta and everywhere else as a painful pest in the grass, so to speak. Then there's Walter R. Tschinkel. An ardent fire ant fan and one of its foremost researchers for more than 30 years, Florida State University's Distinguished Res...

Agriculture and tropical conservation: rethinking old ideas

It's a long-held view in conservation circles that rural peasant activities are at odds with efforts to preserve biodiversity in the tropics. In fact, the opposite is often true, argue University of Michigan researchers John Vandermeer and Ivette Perfecto. Combining case studies with ecologic...

Supersized 'island' of resistance genes discovered in an infectious bacterium

...tance genes are usually located on small auxiliary circles of DNA called plasmids that can be exchanged with other individuals. But in A. baumannii, resistance genes were incorporated into the main chromosome, not the plasmids, according to the study. "It is like the A. baumannii genome is 'anticipating'...

Infants can organise visual information at just four months

...lines (or vertical columns) made up of squares and circles was used, constructed so that shape discrimination would be needed to 'see' lines or columns in the array. To test if visual grouping had occurred, images of plain bars of horizontal lines and vertical columns were then shown. If the infants looked f...

Female butterflies go for sparkle -- not size -- when choosing to mate

... ultraviolet reflectivity of the pupils, the white circles at the center of eyespots, according to new research from University at Buffalo biologists. The research, to be published online June 29 in the Proceedings of the Royal Society B: Biological Sciences, overturns previous work indicating that larger e...

New lifespan extension genes found

...genes are likely to be different, as the toxic DNA circles have not been identified in more advanced organisms, Lin said. The work was published in the Sept. 16 issue of Science. ...

Growth in the sea comes down to a struggle for iron

...is idea remains highly controversial in scientific circles given the very limited understanding of these unique systems, says Wells. Wells specializes in chemical oceanography and has worked in places as varied as Rhode Island's Narragansett Bay and Antarctica. Joining him on the July voyage were two UMaine...

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