World / Science & Education
Demographic Mechanism Of A Historical Bird Population Collapse Reconstructed Using Museum Specimens
16.07.2008 04:12
medicalnewstoday.com
Changes in animal populations happen because of changes in birth rates, death rates or both. For past declines of threatened species it would be useful to know which. A study on museum specimens of the corncrake, a bird which suffered a very rapid, marked and permanent decline in Britain about a hundred years ago, provides clues. Analysis of wing feather shape allows past changes in the proportion of young adults in the population to be tracked.
World
Biology
Avian Olfactory Receptor Gene Repertoires: Evidence For A Well-developed Sense Of Smell In Birds?
16.07.2008 04:12
medicalnewstoday.com
Avian olfaction is poorly understood: birds are widely regarded as relying primarily on visual and auditory inputs. Among vertebrates, the sense of smell is mediated by olfactory receptors (ORs). We estimated the number of OR genes in nine bird species that occupy different ecological niches and found that they vary in relation to the area in the brain that is responsible for the processing of olfactory information.
World
Biology
Dynamics Of Hematopoiesis Across Mammals
16.07.2008 04:12
medicalnewstoday.com
Hematopoiesis is the process responsible for blood cell formation. At the root of this process lie hematopoietic stem cells. The demands for hematopoietic output vary across mammals, where the number of active hematopoietic stem cells scales with mass. Hematopoietic stem cells can be linked with the circulating blood with a model based on human data. By combining these two models, we determined hematopoietic output for various mammals.
World
Biology
Expression Of Arginine Vasotocin In Distinct Preoptic Regions Is Associated With Dominant And Subordinate Behaviour In An African Cichlid Fish
16.07.2008 04:12
medicalnewstoday.com
Hormonal influences on behaviour can be complex. In our study we examined the neuropeptide hormone arginine vasotocin in the brain of an African cichlid fish, in which males are either dominant or subordinate. Our results show that this hormone may have multiple, even opposing, effects on both behaviour and physiology. Neurons that produce arginine vasotocin are found in several brain regions.
World
Biology
Environmental Variation At The Onset Of Independent Foraging Affects Full-grown Body Mass In The Red Fox
16.07.2008 04:12
medicalnewstoday.com
Fox cubs start foraging for themselves in July, but lack the skills to catch larger prey, so hunt insects and earthworms, which are only available on wet nights. So weather conditions in July determine their rate of growth; cubs born in hot dry summers never make up this loss, and become smaller adults. This in turn means that as adults, males have smaller territories and sire fewer cubs.
World
Biology
Wild Beasts - The Devil's Crayon
16.07.2008 03:16
roomthirteen.com
Rising star Wild Beasts flex their limbs with captivating debut single The Devils Crayon
World
Books & CD
Valkyr - The Mirror Has Two Faces
16.07.2008 03:16
roomthirteen.com
Classically inspired instrumental metal from Cornish newcomers already gaining a solid reputation.
World
Books & CD
Everon - North
16.07.2008 03:16
roomthirteen.com
Full-on album from a part-time band every track is a beauty.
World
Books & CD
English