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Tag: "hierarchy" at biology news

Scientists journey to southern Africa to unravel the secret world of elephant communication

...acoustic and seismic estrus calls on the dominance hierarchy among bulls. "Our work is really at the interface of geophysics, neurophysiology and ecology," she says. "We're asking questions that no one has really dealt with before." SIDEBAR: Anatomy of the trunk and feet offers new clues to elephant seismic ...

Biologists determine genetic blueprint of social amoeba

...ified the place that Dictyostelium occupies in the hierarchy of life. "It is more closely related to fungi and animals than we had previously thought," says Adam Kuspa, a professor of biochemistry and molecular biology at Baylor College of Medicine in Houston and a senior author of the Nature paper. The disc...

'Cookbook recipes' would cure disease with nontoxic DNA delivery systems

...lipids instead of cationic lipids "creates a whole hierarchy of interactions and a much richer range of structures," Wong said, "which really opens up new possibilities." ...

Finding the mind's eye

... found that, "early areas in the visual processing hierarchy respond the same whether or not objects are visible to us or invisible in the context of visual masking." That is, some parts of the brain respond to visual stimuli regardless of whether the conscious mind "sees" them or not. However, Tse and his te...

'Uniquely human' component of language found in gregarious birds

...ed a mathematically rigorous set of definitions, a hierarchy of syntactical complexity, that governs the process of how humans create and understand utterances," said Daniel Margoliash, professor of anatomy and organismal biology at the University of Chicago and co-author of the study. "These rules govern how ...

Losing sleep undoes the rejuvenating effects new learning has on the brain

...se findings is that sleep restriction disrupts the hierarchy of cognitive processes. That is, spatial learning seemed to be the primary cognitive strategy, and only when it was disrupted by lack of sleep, did a secondary strategy emerge. "It would be interesting to expand our findings to see if other competing...

Researchers appeal for new regulations to save coral reefs from live fish trade

...ortant part of the food chain means the coral reef hierarchy is in turmoil. The coral-eating crown-of-thorns starfish is likely to thrive in these situations, particularly when the corals are already stressed by a multitude of other impacts including global warming. According to the 2004 Status of the Coral ...

Wasps queue for top job

...ged the position of individual wasps in the social hierarchy by removing higher ranked, older wasps, thus promoting their younger relatives. Regardless of age, a wasp's contribution to feeding the queen's young depended only on its position in the queue to inherit queenship. Lower-ranked helpers, and helpers...

Slow brain waves play key role in coordinating complex activity

...ut how the brain is organized says that there is a hierarchy of oscillations that can control how one neuron talks to another neuron, or how one brain area talks to another brain area," said lead author Ryan Canolty, a UC Berkeley graduate student in the Helen Wills Neuroscience Institute. "Our study was desig...

Fish can determine their social rank by observation alone, study finds

..."These fights, taken together, imply the dominance hierarchy A>B>C>D>E," the authors wrote. But did the bystander really comprehend this intricate pecking order, and if so, would he use that knowledge to make logical decisions about the same fish paired in new relationships? To find out,...

Undergraduate research shows leaderless honeybee organizing

...,” Schnieder said. “The colony is not a dominance hierarchy and, from a human perspective, this is unusual. Our human society is very dominance hierarchy structured --we have centralized systems of control. But bee colony systems of control are very diff...

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