In fact, cats haven’t changed much physically or genetically from their African wildcat ancestors (Felis silvestris lybica), Grange and Geigl say. But cats may not have been purring lap pets at that time, say molecular biologists Thierry Grange and Eva-Maria Geigl of the Institute Jacques Monod in Paris. For example, domesticated plants don’t drop their seeds when ripe; they rely on humans to spread their progeny.
“It completely changed my view of horse domestication, because I saw people interacting with this animal in ways I couldn’t imagine myself,” Orlando says. As people spread to the New World, they continued to domesticate animals. That’s different from wild animals that have been tamed but don’t pass on that tameness to the next generation. Researchers have set out several biological criteria that should determine when silver foxes, or other animals, cross the line that divides merely tame from fully domesticated. Even though the friendly Novosibirsk foxes are genetically tame — some are sold as pets — not everyone would call the animals domesticated.
The EU has expressed hope that new research will provide scientific grounds to rebut these challenges to its ban. At a May 2000 meeting in Copenhagen, Jegou finally encountered other researchers who shared his concerns. Indeed, although he is a biologist specializing in reproduction and hormonelike substances, Bernard Jegou notes that until 3 years ago, he had never heard people discuss excreted livestock hormones. The economic incentive for farmers to use the hormones–it can amount to a 40-fold return on their investment–is compelling (see The Financial Lure of Hormones,below) and will probably fuel the practice for some time. He and Rall reasoned that with all the steroid hormones being prescribed not only to livestock but also to people–such as to women for birth control or postmenopausal therapy–excretions of these drugs must be substantial. Institute of Environmental Health Sciences (NIEHS) used animal models to investigate why DES fostered the development of cancer in daughters of women treated to avoid miscarriages.
Dog days
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Researchers can often infer from orionsbet casino review an animal’s behavior that it is in pain, Leach says. His lab team and others have identified a range of expressions in more than a dozen species, from mice to horses. Ferrets living in lab cages were given extra playtime (below, left) to reduce boredom some days and not others. Mason and her colleagues reasoned that a depressed animal would lose interest in its surroundings, but a bored animal might be drawn to both negative and positive stimuli, just to get a reprieve from monotony.
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This ancient Siberian ice mummy had a talented tattooist
He studies dire wolves and wants to compare the new pups’ teeth and bones to those of ancient animals. “I don’t think the animals will be readily available to the public.” “That’s the part that makes me very cautious” about bringing back dire wolves, woolly mammoths or other long-extinct animals, she says. When animals go extinct, other species fill in the gaps in the ecosystem, taking advantage of their newly changed world.
Ancient southern Africans took genetic evolution in a new direction
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Colossal put together genetic puzzle pieces to create their pups
Kevin Ellis of Vancouver, Wash., won in computer science for his development of a program that splits tasks among computer chips. Seaborg chaired the board of Society for Science & the Public, formerly Science Service, which publishes Science News and also administers the science fair. Adiseshan determined the genetic code of a specific gene in several species of the bees and the nematodes. The researchers tracked elephants in the area and showed very limited movement. Shrinking habitat and climate change may play a role in keeping the elephants exposed to the deadly pathogen — whatever it is, researchers say.
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Mental health
From March through July 2020, cyanobacteria abundance increased continuously as water sources were shrinking, researchers report online May 28 in the Innovation. Anthrax and bacterial infections had been ruled out in the new deaths and “further laboratory analysis is ongoing,” Botswana’s Department of Wildlife and National Parks reported in a March 24 news release. Puzzled scientists have been calling for thorough investigations as the government sends mixed messages on the cause of death. African elephants walk through the Moremi Game Reserve in northern Botswana, where a second wave of mysterious deaths among the pachyderms has scientists scrambling. Bisgaard taxon 45 has previously been isolated from tiger and lion bite wounds in humans, as well as from a chipmunk and healthy captive parrots, the researchers say. “Past cases may have been missed,” the researchers write.
While federal law prohibits people from self-medicating with most steroids, administering these drugs to U.S. cattle is not only permissible but de rigueur. In physical sciences, Erika DeBenedictis, Haochen Hong and Duanni Huang of Albuquerque won for developing a new approach for identifying asteroids. In earth and planetary science, Marley Iredale of Sequim, Wash., won for her research into the history and risk of tsunamis in Discovery Bay, Wash.