Tag: "metamorphosis" at biology news

Tadpoles and tumors

...The real magic happens as the children witness the metamorphosis from tadpole to frog. Within the mystery of this transformation is a biological series of changes that among other things, allows one appendage to be shed while four others sprout from the tadpole's body. Before a tadpole becomes a frog, it must l...

Science writer Ron Redfern to receive geoscience Award for Outstanding Contribution

...an and American companies. He underwent a personal metamorphosis when he 'retired' in 1975. During frequent visits to the U.S., Redfern was captivated by both the spectacle and the history of the American Southwest. He decided to share his growing interest in geomorphology and its human interface by writing and i...

Amphibians' life stages influence contaminant transfer from aquatic to terrestrial environments

...ects of both developmental stage and the timing of metamorphosis on the concentrations of a series of trace element...Elimination or retention of trace elements through metamorphosis not only has important implications for the health of recent metamorphs, but also determines the qua...

First-ever images of developing dengue virus obtained at Purdue

...m its findings, which Kuhn considers critical. The metamorphosis the dengue particle undergoes is so radical, he said, that there is a possibility the immature form the team has seen is not actually a step in dengue's development. For the moment, however, the results are encouraging enough to pursue the research f...

URI oceanographers test method to control metamorphosis in summer flounder

...avior of metamorphosing summer flounder. Like the metamorphosis of a tadpole into a frog, flounder metamorphosis is controlled by thyroid hormones. The scientists devised and tested a treatment using thiourea, a n...

New research could spearhead permanent nuclear waste storage

...ity environmental scientist. It also documents the metamorphosis of the high aluminum content waste from liquid to solid. This knowledge will be applied to the permanent disposal of the 53 million gallons of radioactive material held in 177 giant underground tanks at the Department of Energy's Hanford Nuclear Rese...

Popular weed killer demasculinizes frogs, disrupts their sexual development

...ad such abnormalities. Also, while normal males at metamorphosis have larger vocal organs than females, the organs of more than 80 percent of males exposed to 1 ppb or more of atrazine were smaller than average. Sexually mature males showed a 10-fold decrease in testosterone levels, bringing them below levels foun...

URI oceanographers link warmer water temperatures and the decline of winter flounder

...e resulted in 10-16% fewer larvae surviving to the metamorphosis stage at 6 weeks. Winter water temperatures in Narragansett Bay have significantly increased over the past 40 years. The warmer temperatures impact the winter-spring bloom, having an influence on the availability of food to higher level organisms. ...

Endangered butterfly needs proper habitat, special nectar

...ral times before reaching the pupa stage and final metamorphosis into a butterfly. The butterflies live only a week to ten days, but as a population they are out for about four to six weeks. During that time they need about 20 milligrams of wild flower nectar per square meter to support their population, accordi...

X-ray studies shed light on frog deformities

... limb malformations in frogs that have survived to metamorphosis -- the transformation from tadpole to frog -- at several different locations in the United States. "These malformations are the result of environmental factors affecting the frog limb development during early tadpole stages, and this study shows th...

How a hormonal henchman triggers death

...val fruit fly Drosophila melanogaster begins its metamorphosis into an adult. "Studying the process of programme...stand why pulses of ecdysone that occur throughout metamorphosis have different effects depending on the developmental stage of the fly. "Such stage-specificity tel...

Researchers say hormones are key to evolution of insect metamorphosis

...professors are proposing a novelhypothesis for how metamorphosis evolved. Their proposition suggests that achange i...tching. The four major insect groups with complete metamorphosis all are thought todescend from a common ancestor, so it appears the development of metamorphosisin t...

Butterfly Wings, Beetle Horns Teach Biologists Basic Lesson In Development's Laws

...s fordemonstrating such competition because during metamorphosis they were "closedsystems." An insect pupa does not feed and instead contains a fat body thatprovides the only nutrition for the developing adult animal, making the resultsof competition far more clear-cut. "Such competition would be more d...

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