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Tag: "chick" at biology news

Study investigates 'divorce' among Galapagos seabirds

...aness said. It takes a lot of energy to raise a chick and the responsibility is shared by both males and females. They raise one chick at a time. Parents incubate the egg for 43 days. Then, it takes another 100 to 120 days of parenta...

Reversing cancer cells to normal cells

...human embryonic stem cells, the zebra fish and the chick embryo. Dr. Hendrix’s plenary lecture on Apri...med in the human embryonic stem cell model and the chick embryo model - where inhibiting Nodal signaling led to the reversal of the melanoma cells to a more ...

Biologists call for better choice of model organisms in 'evo-devo'

...iology (fruit fly, nematode worm, frog, zebrafish, chick and mouse). To help understand how developmental change underpins evolution, evo-devo researchers have, over recent years, selected dozens of new model organisms, ranging from sea anemones to dung beetles, to study. One of the selection crite...

Making a face: A new and earlier marker of neural crest development

...f mRNAs -- that formation of neural crest cells in chick embryos is independent of both mesoderm and neural...he researchers grew grafts of cells from "stage 3" chick embryos, before the neural plate formed, in non-inducing cultures. Surprisingly, restricted regions ...

UF scientists restore sight to chickens with blinding disease

...enetics Institute. "I thought I saw signs that the chick was responding visually to the environment, but I didn't want to believe it. Scientists always doubt what they see -- it's intrinsic to how we operate. So I did this simple little test, drawing little dots on a piece of paper. The chick, which was st...

Stowers scientists demonstrate mechanism of vertebral formation

...ation of the vertebral precursors in the mouse and chick embryo. The findings, which were published in the March 7 issue of Developmental Cell, indicate that the genes governing many cellular properties are downstream of the segmentation clock, the mechanism that controls the formation of the vertebral c...

Scientists crack code for motor neuron wiring

...essed by motor neurons that project to the wing in chick embryos. "It became clear that these proteins weren't randomly expressed, but were expressed in highly precise patterns that corresponded to anatomically-defined motor neuron pools," said Jessell. Dasen's functional analysis revealed a Hox coding hi...

New possibilities for flu antiviral and vaccine research emerge from 'Spanish flu' virus

...s. Then they studied the viruses' effects in mice, chick embryos and human lung cells and identified the constellation of genes that was responsible for the Spanish flu virus' extreme virulence. One gene associated with high virulence was the HA gene, which encodes the hemagglutinin surface protein that ...

Removing egg from nest may help save endangered whooping crane

...r-parenting" program. Cranes usually rear a single chick and the other dies to siblicide or is killed by a ... our paper." Boyce suggests several reasons why a chick might survive when an egg is removed from a nest. Sibling aggression has been so strong that some ch...

Molecular mechanism of feather formation found

...to form in the tufted branches of the simple downy chick feather. The two proteins, which tend to play off ...of either Shh or Bmp2 into the skin of six-day-old chick embryos. The virus infected only small patches of cells and allowed Harris to locally examine the ef...

Simple explanation for complex pattern of feather development

...or the inhibitor, Bmp2, in the skin of six-day old chick embryos by injecting them with a retrovirus. The results were seen in localized patches and demonstrated that a simple relationship between developmental genes could be the basis for formation of feather structures. This was the first documentation, ...

The synapse is a shotgun

...- to create a detailed 3-D map of the synapse of a chick ciliary ganglion. This ganglion is a cluster of neurons that connect the brain to the iris of the eye. It launches the neurotransmitter acetylcholine from sac-like vesicles across the synapse to two types of receptors, called alpha 7 and alpha 3. Se...

What comes first…the chicken, the egg, or the bad attitude?

...nto body-building results in lower egg production, chick production and chick quality, said Dr. Frank Robinson, professor of Agricultural Food and Nutritional Science at the Univ...

Penguin chicks exposed to human visitors experience spike in stress hormone

...n two weeks before fledging, which occurs when the chick is about 75 days old. None of the chicks demonstrated an elevated baseline corticosterone level. But 30 minutes and 60 minutes after capture, newly hatched chicks regularly visited by humans had levels more than three times higher than undisturbed c...

Looks matter to female barn swallows

...arn swallows typically care for at least one young chick that was actually fathered by another bird. The researchers used this widespread phenomenon of cheating to test the factors that may keep a female barn swallow faithful to her mate. Sometimes males even rear an entire nest of illegitimate young. Aft...

First production of human monoclonal antibodies in chicken eggs published in Nature Biotechnology

...gg white. The stem cells were then introduced into chick embryos. At this stage of development, the embryonic stem cells can make significant contributions to the developing chicken. Resulting chimeras with large contributions from the stem cells lay eggs containing milligram amounts of antibody, which is ...

The lopsided brain: Attention bias is shared by humans and birds

... researchers tested two bird species, the domestic chick and the pigeon, for their performance on a task in which they were allowed to freely peck at grains of food that were spread evenly in an area before them. Though the birds' bodies were positioned at the midline of the search area, both chicks and pi...

Stem Cell Research Shows Potential for Replacing Tissue Damaged in Heart Attacks

...lop in the embryo itself. In research conducted on chick embryos since 1992, his team discovered that a group of very young embryonic cells called “precardiac endoderm?sends strong signals that cause adjacent cells in the embryo to become cardiac myocytes. Based on this finding, Dr. Lough reasoned that pre...

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