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Tag: "juvenile" at biology news

Revealing the machinery underlying the 'plastic' juvenile brain

...ow, researchers comparing the genetic machinery of juvenile and adult mouse brains undergoing visual experienc...ell Press. In their experiments, after keeping juvenile and adult mice in the dark for three days, the researchers exposed the animals to episodes of normal...

In young mice, gregariousness seems to reside in the genes

...because it suggests that the genetic influences on juvenile social behavior may be quite distinct from genetic...ndividual. Results of the new work suggest that juvenile animals may experience different emotional states, depending upon whether they are alone or with oth...

Antibody therapy prevents type 1 diabetes in mice

...eart disease and nerve damage. Previously known as juvenile diabetes, type 1 diabetes is usually diagnosed at a very early age, but in some cases it can be diagnosed in adulthood. In this study, the Pitt researchers treated non-obese diabetic (NOD) mice with an antibody -- a type of protein produced by the ...

New evidence of 'human' culture among primates

...thermore, in a large minority of cases, adults and juvenile monkeys were seen banging the stones together without paying him any attention at all - suggesting that the younger monkeys were learning the skill from their more experienced elders. Captive monkeys released into the area that joined the study group...

Fish growth changes enhanced by climate change

...eratures have been a primary factor in determining juvenile growth rates in the species examined ?Banded morwo...861 to 1993. Growth rates of a coastal species, juvenile morwong, in the 1990s were 28.5 per cent faster than at the beginning of the period under assessment...

US conservation efforts bring more marine turtles to UK

...to British waters. Scientists do not know why some juvenile turtles make the journey to Northern Europe, but believe they may simply be driven by the North Atlantic current system. The eggs of Kemp’s ridley turtles were harvested in huge numbers and the species reached near-extinction before protective mea...

Salmon farms kill wild fish, study shows

...ms kill wild salmon. Up to 95 per cent of the wild juvenile salmon that migrate past fish farms die as a resul...rate. "It takes only one or two sea lice to kill a juvenile pink or chum salmon," said Krkosek. "The juveniles are so vulnerable because they are so small ?only...

How did bilaterally symmetric flowers evolve from radially symmetric ones?

...per plant and the number of seeds surviving to the juvenile stage, than plants with radially symmetric flowers. "This study reveals that natural selection can play a key role in the evolution of flower bilateral symmetry," says Camacho. "Our data also suggest that it is possible to understand the evolution...

A buffet for early human relatives

...ta are produced under the gums during the animal's juvenile years, when teeth are growing. Each laser sampling vaporized enamel that formed during several months and thus represented what Paranthropus ate during that period. By taking several samples off the length of each tooth, the researchers reconstru...

Some butterflies travel farther, reproduce faster

...tches had more total protein vitellogenin juvenile hormone Juvenile hormone appears to be a key. It plays an important role in regulating egg and larval development and also regulates reproduction, particularly egg maturation, in adults, Fescemyer said. Vitellogenin is the protein precursor to egg ...

Adolescent but not adult hamsters are more aggressive on low dose of fluoxetine

...ts at the University of Texas at Austin found that juvenile hamsters given low doses of fluoxetine hydrochlori... Taravosh-Lahn, BA, says the findings confirm that juvenile and adult brains are different. Thus, she says, "It is unwise to expect a drug to work the same in ...

A giant among minnows: Giant danio can keep growing

...ish exhibited little hyperplastic growth after the juvenile phase. Next step This model can be used to investigate muscle wasting diseases such as muscular dystrophy. Other studies have already shown that a condition similar to muscular dystrophy can be experimentally induced in zebrafish. One of the ne...

Ocean temperature predicts spread of marine species

...y won't travel as far and may not make it to their juvenile habitat," O'Connor said. The researchers suspect temperature plays an important role in larval dispersal because metabolic processes in larvae are sensitive to temperature and similar among species. Consequently, larvae in cold waters develop more...

Trotting with emus to walk with dinosaurs

...al flat, perhaps in family groups, since there are juvenile and adult tracks. If so, that could infer some sort of parental care, he said. At very least the tracks seem to support the idea that the dinosaurs were social animals, just like modern birds. Breithaupt remains cautious about over-interpreting t...

Protowings may have helped bird ancestors cover rough terrain

...eagues performed experiments on several species of juvenile galliform (chicken-like) birds, concentrating on c...ne running as have now been demonstrated in living juvenile birds. Their work thus supports a new theory about the evolution of flight in birds. WAIR, which the...

Mutant mice show key autism traits

...aired social learning or inability to identify the juvenile due to the low level of initial interaction," wrote the researchers. In other tests of social behavior, the researchers found that--when given the choice of investigating a cage holding another mouse or an empty cage--the mutant mice showed similar ...

Mice learn tasks that may help treat human psychiatric disorders

..., making these disorders about as common as Type I juvenile diabetes. This rate is higher than for other childhood disabilities, including Down's syndrome, cancer, cerebral palsy, hearing loss and vision impairment. Although the number of children diagnosed with autism has increased dramatically over the pa...

Prozac's target revealed

...g the effects of the drug on brain neurogenesis in juvenile and pregnant mice. The results of those experiments may provide valuable information for assessing the possible effects of Prozac and related drugs on fetal and adolescent brain development. The researchers are currently using the approach and tools...

Scientists reverse evolution

...similar gene, essentially creating an embryonic or juvenile beta hemoglobin gene that could make hemoglobin normally during adult life. ...

Successful transplantation from pig embryos to mice

...sease. For many, particularly those afflicted with juvenile diabetes, transplants of the pancreatic tissue in which insulin is produced might alleviate these problems. Unfortunately, there are not nearly enough organ donors available for transplantation. Insulin-producing pancreas tissues from animals could ...

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