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Tag: "reproduce" at biology news

'Protecting virus' offers instant flu protection and converts flu infections into their own vaccines

...irus, it retains its harmless nature but starts to reproduce ?and at a much faster rate than the new influenza virus. This fast reproduction rate ?spurred by the new flu infection ? means that the new invading influenza is effectively crowded out by the 'protecting virus'. This vastly slows the progress of t...

New clues to how sex evolves

...ee days, is under a lot of competitive pressure to reproduce quickly, and that different binding sites on different Pairing Centers makes for faster chromosome pairing and thus faster reproduction -- unlike organisms that need to find a mate before they can reproduce, and mature more slowly." Evolution ...

Why do cold animals make bigger babies?

...who grow large because they require more energy to reproduce in the cold. When they tested the theories simultaneously with their new approach, the team concluded that temperature's effect on reproduction is a byproduct of its effect on adult size. "This result could have widespread significance," says Angi...

Fungal factories may save hemlock forests

... believe they can get the adelgid-killing fungi to reproduce in large numbers on its own. "The sweet whey only costs 32 cents a pound," says Costa, who gets his donated from a New York-based cheese company, and receives support for his research from the USDA and EPA and other funders. Whey is a far chea...

Immunization rates hit record high in poor countries

... believe they can get the adelgid-killing fungi to reproduce in large numbers on its own. "The sweet whey only costs 32 cents a pound," says Costa, who gets his donated from a New York-based cheese company, and receives support for his research from the USDA and EPA and other funders. Whey is a far chea...

Multiple malaria infection inhibits spread of parasite

...squito. The malaria parasite needs the mosquito to reproduce and spread. The gametocyte is the developmental stage of the parasite that can be transmitted from people to the mosquito. In the mosquito's stomach the gametes are released and fertilisation takes place. The parasite develops further until the final...

Mitochondrial genes move to the nucleus -- but it's not for the sex

...important clue in flowering plants. "Plants that reproduce clonally or are capable of self-pollinating have transferred more genes from the mitochondrion to the nucleus," said graduate student Yaniv Brandvain, lead author of the paper. That discovery, Brandvain explained, is unexpected. The most obvious ...

Study of planarians offers insight into germ cell development

...cell.?" S. mediterranea also has the ability to reproduce asexually: It clones itself by means of fission. In looking at nanos in asexual individuals of this species, the researchers made the surprising discovery that these asexual individuals also express nanos and produce germ cells. Some other mechanism,...

Jefferson researchers' discovery may change thinking on how viruses invade the brain

...n, but did not cause disease. The virus?ability to reproduce was greatly diminished. "What we found has nothing to do with transport," Dr. Schnell says. "We saw that the virus was weakened if we removed the LC8 binding site and viral replication and transcription were affected. But we didn’t find a differen...

Penn researchers replace organ in adult mice using 'single-parent' stem cells

...embryonic stem cells, the researchers were able to reproduce much of their findings by producing blood stem cells from embryonic stem cells entirely in the culture dish before transplanting them. The Penn researchers believe that using uniparental embryonic stem cells as a tissue source could provide a majo...

Birth rate, competition are major players in hominid extinctions

...imates to evolve as relatively brainy animals that reproduce slowly. However, when climate changed so that tropical forests shrunk and the environment became patchy, many species including primate species became extinct. "While past primate populations moved with the forest, early hominid cultures 2.5 mill...

Sleep enforces the temporal sequence in memory

...d recall, but only when the students were asked to reproduce the learned words in forward direction. This finding shows that sleep associated consolidation of memories enforces the temporal structure of the memorized episode that otherwise might be blurred to a timeless puzzle of experiences. ...

Amur leopard still on the brink of extinction, scientists say

...le leopards would live in the same amount of land, reproduce and nourish their cubs. "Maybe this is the reason why leopards practically completely disappeared from the Korean Peninsula and north-east China," said Dr. Pikunov. "At the beginning of the past century, the Far Eastern leopard was a common specie...

Is there a pilot in the insect?

...E, a captive flying robot microhelicopter that can reproduce much of the mysterious natural insect behavior. Their work is published online in Current Biology, February 8, 2007. How does a tiny creature like a fly or a bee, with a brain the size of a pinhead, manage to make such a magnificent job of controlli...

How fish species suffer as a result of warmer waters

... low temperatures. The latter are able to grow and reproduce only within a very limited thermal tolerance window. Investigations at the Alfred Wegener Institute show the key importance of oxygen uptake and distribution ?through respiration and blood circulation ?in setting the animals' thermal tolerance ran...

Smithsonian scientists discover new marine species in eastern Pacific

...scovered new species of ribbon worms that live and reproduce among crab eggs. These worms can be important pests of commercial species, but they are often overlooked because they are smaller than the eggs themselves. "All the tedious dissections and microscope preparations done on a rolling, vibrating ship hav...

Rapid response was crucial to containing the 1918 flu pandemic

...guson and his coauthor used mathematical models to reproduce the pattern of the 1918 pandemic in different cities. This allowed them to predict what would have happened if cities had changed the timing of interventions. In San Francisco, which they found to have the most effective measures, they estimate that ...

Hives ferment a yeasty brew, attract beetle pest

... the beetle larvae to consume all the stored food, reproduce and multiply. "If beekeepers can reverse the trend and eliminate the beetles, the hive can be saved," says Tumlinson. "If they can stop the beetles and remove eggs in the hive, the hive recovers." Honeybees are of major economic importance in agr...

From the deep -- Researchers find new species of sea anemone

...ndreds of years. Nor are they sure how A. pearseae reproduce (each anemone may have male and female sex organs), or if it lives exclusively on whale carcasses. "So far, a single dead whale is the only place where we've found these anemones," Daly said. She and Gusmão plan to include A. pearseae in a long...

Spud origin controversy solved

... before the 1840s because they were better able to reproduce in long-day conditions, in contrast to Andean potatoes that were short-day adapted. “The results of these studies are of interest not only to evolutionists but also for breeders. Years of effort were made to artificially recreate the European pota...

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