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Tag: "pups" at biology news

Rats infected as newborns grew up vulnerable to memory problems during an immune challenge

...ed by Staci Bilbo, PhD, injected a group of 49 rat pups on postnatal Day 4 either with the common intestin...time when the brain grows significantly. Once the pups grew up, Bilbo and her colleagues tested the adults' memory about 60 days after birth. To test memor...

Elephant seal pups suffer from ocean warming

... fewer reserves to draw on during nursing. Nursing pups get all nourishment from their mothers; changes in...Crocker monitored the weight of 2750 elephant seal pups over a period of 29 years, from 1975 to 2004, during which the ocean temperature generally increased...

Component in soy products causes reproductive problems in laboratory mice

...ower doses were subfertile, meaning they had fewer pups in each litter, and fewer pregnancies. Mice receiving the highest level of genistein, 50 mg/kg per day, had a high percentage of egg cells that remain in clusters, unable to separate and therefore develop abnormally. The researchers explain that oo...

Sex chromosome genes influence aggression andmaternal behavior, say UVa researchers

...ted high levels of maternal behavior by picking up pups and building nests. "We know that hormones are important for development of sex differences in brain and behavior," Rissman said. "But this is another component of the sex difference that needs to be examined." In all probability, Rissman said, gene...

Alaska seal pup diet may hold key to decline of population

Female harbor seal pups whose blubber falls below average levels may be at...l Biology 2006. The study found that harbor seals pups that were heavier when captured from the wild continued to gain weight and grow regardless of whethe...

Wild meerkats school their young

...ientists have discovered that older meerkats teach pups how to obtain food by incrementally introducing de...covered that in order for the helpers to teach the pups how to handle food without putting them in harm's way, the older meerkats would kill or disable the ...

Dominant meerkats render rivals infertile

...the fertility of her subordinates. First, her own pups will benefit from not having to compete with additional pups born to a subordinate for the limited number of available caretakers. Second, because subordinate fe...

Researcher gives hard thoughts on soft inheritance

...dy showed that early grooming and nurturing of rat pups by rat moms affects methylation of a glucocorticoi...ptor gene in the hippocampus in the brain. If the pups get lots of nurturing the glucocorticoid gene gets turned on and expressed early at a critical perio...

Pheromone from mother's milk may rapidly promote learning in newborn mammals

By studying the ability of newborn rabbit pups to learn the significance of new odors, researcher...a chemical booster that facilitates the ability of pups to quickly associate environmental odors with the opportunity to nurse. The findings, which deepen...

How mammals fuel milk production may have implications for cancer

... down lipids. As early as two days after birth, pups nursed by mice lacking Akt1 weighed significantly less than those nursed by normal mothers. That difference in weight only grew more exaggerated with time. In contrast, the researchers reported, the offspring of Akt2-deficient mice gained weight norm...

Cloned mice created from fully differentiated cells, a milestone in cloning research

...s proof, researchers report they created two mouse pups from a type of blood cell that itself is incapable...nt developed to the blastocyst stage and 18 cloned pups were born. "Our results clearly demonstrate that there is no apparent advantage in using either adu...

Short chromosomes put cancer cells in forced rest

...ed cell growth, or cancer. The first generation pups born to these mice contained no telomerase and very long telomeres. These mice all developed lymphomas by the time they were 7 months old. The researchers then continued breeding the mice to see what would happen in later generations. By the fifth ge...

Experimental vaccine given during pregnancy reduces stillbirths from common virus

... before becoming pregnant gave birth to fewer dead pups and were less likely to transmit the infection to ...The vaccinated group (10 litters) produced 28 live pups and 4 dead pups—a mortality rate of 13 percent. The control group (8 litters), which received a vac...

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