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Tag: "mammals" at biology news

Widely used iron nanoparticles exhibit toxic effects on neuronal cells

... extensions. "Iron is an essential nutrient for mammals and most life forms and iron oxide nanoparticles were generally assumed to be safe," said Sungho Jin, a professor of materials science at UCSD and senior author of a paper to be published in Biomaterials. The paper is currently available on the journ...

Dinosaur extinction didn't cause the rise of present-day mammals, claim researchers

...te 'tree of life' tracing the history of all 4,500 mammals on Earth shows that they did not diversify as a re...5 million years ago prompted the rapid rise of the mammals we see on the earth today. The multinational research team has been working for over a decade t...

A first glimpse of the influenza replication machine

...le in the transmission of avian influenza virus to mammals were located within, or close to, this site of interaction. This suggests that mutations may affect the efficiency of nuclear transport and through this the ability of the virus to replicate in different species. "Interfering with polymerase funct...

Fruit fly gene research may shed light on human disease processes

...operly count X chromosomes is lethal to embryos of mammals and flies. That's why biologists want to understand the process of "chromosome counting." Early in his career, Erickson was part of the research team that identified the genes involved in counting Drosophilia sex chromosomes. Now, he and Avila h...

Scientists discover new species of distinctive cloud-forest rodent

... Andean tree line, Manu is home to more species of mammals and birds than any equivalently sized area in the world. "Like other tropical mountain ranges, such as the Himalayas, Ruwenzoris, Virungas and Kinabalu, the Andes support a fantastic variety of habitats," said Bruce Patterson, MacArthur Curator of...

MicroRNA helps prevent tumors

...g hundreds in humans. Moreover, microRNAs found in mammals regulate over a third of the human genome, as show...of a particular microRNA on a particular target in mammals (although such connections have been shown in plants, worms and flies). Several groups have demonstr...

Study of planarians offers insight into germ cell development

...anarians share some important characteristics with mammals that may help scientists tease out the mechanisms ...s called inductive specification, and is common to mammals and a number of other animals. Graduate student Yuying Wang and the other team members were able ...

Making mice with enhanced color vision

...imates such as humans and monkeys are unique among mammals in that they have three visual receptors that absorb short (blue), medium (green) and long (red) wavelengths of light. Mice, like other mammals, only have two; one for short and one for medium wavelengths. In the study, the researchers designed ...

Old dinosaur research leads to new honor

...gs of major evolutionary events ?to that time when mammals and reptiles and birds were just becoming separate from each other. It was an exciting time in history, about 270 million years ago ?it was between ice ages, just like the time we are living in now ?and I think my work has led to a greater understand...

Birth rate, competition are major players in hominid extinctions

... game, but switched to also fishing, snaring small mammals like rabbits and capturing turtles and birds. "Rather than being a specialized large mammal predator, modern humans would eat anything they could get their hands on. They eked out a living even if it meant eating grasshoppers or whatever," says J...

Computer scientists join in search for ivory-billed woodpecker

...tural scientists observe animals ?whether birds or mammals ?in the animals' habitats. Song and Goldberg have developed robots to webcast images of animals from the animals' habitats to natural scientists' computers. In addition to the Cache River National Wildlife Refuge, they've installed one of their ...

Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward

...the loss of krill will reduce resources for higher mammals and birds. Data gained through the Long-Term Ecological Research (LTER) site near the American Palmer Station suggests that the ecosystem's response to warming in the region includes changes in both the krill's abundance and availability. "Th...

Paleontologists discover new mammal from Mesozoic Era

...at is an intermediate step between those of modern mammals and those of near relatives of mammals, also known...ondition in the evolutionary process of how modern mammals acquired their middle ear structure." Yanoconodon is about 5 inches (or 15 cm) long and estimated...

New sucker-footed bat discovered in Madagascar

...m east to west. Bats are the last group of land mammals on Madagascar that have not been intensively studied, Goodman said. "Until a decade ago, these animals remained largely understudied. On the basis of recent surveys and taxonomic research, about one-third of the island's bat species were unknown to s...

Mercury contamination of fish warrants worldwide public warning

...d. Methylmercury levels in fish-eating birds and mammals in some parts of the world are reaching toxic levels, which may lead to population declines in these species and possibly in fish populations as well. "The policy implications of these findings are clear," said James Wiener, a Wisconsin Distin...

'Marathon mice' elucidate little-known muscle type

...light" amino acid chains. While most muscles in mammals contain a mixture of slow- and fast-twitch fiber types, some muscle beds are enriched for one type or the other, Spiegelman said. However, adult skeletal muscles also contain fibers with an abundance of a fourth MHC, type IIX, about which much less i...

Woman's Day and For Womens of Science

...d. Methylmercury levels in fish-eating birds and mammals in some parts of the world are reaching toxic levels, which may lead to population declines in these species and possibly in fish populations as well. "The policy implications of these findings are clear," said James Wiener, a Wisconsin Distin...

Scripps research study shows humans and plants share common regulatory pathway

... SGT1 is a protein found in yeasts, plants, and mammals in both the nucleus and the cytosol. It functions in several biological processes through interaction with different multi-protein complexes. A large body of evidence also suggests that the protein plays a role in regulating pathogen resistance in pl...

Male owls pitch their hoots to advertise body weight to competitors

...as interesting similarities to that of terrestrial mammals where the information is typically encoded in acoustic components of the calls rather than in the diversity of the vocal repertoire as it is in songbirds," says Reby, who is an expert in the study of mammal vocal communication. ...

First demonstration of new hair follicle generation in an animal model

... like other animals such as newts and salamanders, mammals have the power to regenerate. These findings are p...les. In fact, investigators generally believe that mammals had essentially no true regenerative qualities. (The liver can regenerate large portions, but it is ...

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