Sentences with phrase «which tadpoles»

To understand TH, director emeritus Donald Brown studies one of the most dramatic roles of the hormone, the control of amphibian metamorphosis — the process by which a tadpole turns into a frog.

One of the most fun environmental monitoring protocols is the Tadpole Bureaucrat Protocol, in which a tadpole that I give to impatients is put in the water that you share with them to see how they grow and develop.

Not exact matches

Roger Shinn, who taught ethics for many years at Union Theological Seminary in New York, offers a clearly written essay, «Between Eden and Babel,» in which he explores in brief compass many of the moral issues involved as well as some of the first ethical discussions of cloning more than thirty years ago after tadpoles had been cloned.

In response to this particular environmental selection pressure, what evolved was a means by which some of the tadpoles can mature in about two - thirds of the time.

The researchers, who release their findings in the Proceedings of the National Academy of Sciences, did not see a similar reduction in trematode infections in the presence of larval damselflies, which are intraguild predators, meaning they attacked and killed not only the parasites but also the tadpole hosts.

Another adaptation that became popular was direct development, that is, producing young without a tadpole stage, which is standard for about half of all frog species today.

Only one test — in which Wilson simulated a predator by squirting water at the animals — revealed a personality shift; a tadpole that responded by freezing in place for a long time was just as likely to become a frog that resumed normal activities right away.

Tadpoles from six countries across three continents were tested for «protists» — single celled microbes with complex cells which store their DNA in a nucleus, like human cells.

Tadpoles that ventured into the red portion received a mild electric shock, and Levin and Blackiston recorded which animals eventually learned to avoid the red side.

Tadpoles of the Cascades frog prefer to associate with siblings, which they distinguish from nonsiblings.

These small Chinese natives, which attract females by belting out quick chirps, dig deep caverns near ponds for shelter and raising tadpoles.

They were less likely to school and swim along with other tadpoles (a tadpole proxy for socialization, which is impaired in autism); they weren't as good at avoiding contact with animated images projected on to the bottom of their petri dishes; they didn't habituate to startling noises (another analog to autism in people); and induced seizures were more frequent and shorter than in normal tadpoles.

The EPA then uses WatchFrog's tadpole test as a middle step to discover which suspicious chemicals require expensive, time - consuming toxicology tests, says Kevin Crofton, acting deputy director of the EPA's National Center for Computational Toxicology.

Because of this lapse, WatchFrog is targeting its tests to OECD guidelines, which define hormone disruptors as chemicals that can disrupt the ability of a fish to produce eggs or change sex or prevent a tadpole from metamorphosing.

«The light elements that makes up these «molecular tadpoles» are easily located by neutrons» says Dr Isabelle Grillo, at the ILL. «Moreover, small angle neutron scattering which we use at the ILL allows to characterise the self - assembled systems from the nanometre scale to tenth of micrometres and is perfectly adapted to observe the coming together of the C60 footballs» into these beautiful core structures.»

Sacs of eggs burst into tadpoles which became frogs and laid sacs of eggs.

Eggs are laid, tadpoles hatch and transform into froglets, which eat and grow as much as they can, and then everybody descends into the earth once more to wait another 10 months.

Since it was after Congressional work hours though, I turned to the next installation, which had a large vat of nearly 100 squirmy tadpoles.