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Tag: "mature" at biology news

RNA map provides first comprehensive understanding of alternative splicing

...known as pre-mRNA, is pieced together to produce a mature mRNA that codes for cellular proteins. In alternative splicing, different pieces of this pre-mRNA, called exons, are stitched together to produce different mRNAs, and thus different proteins. The exon can be spliced in or out in a binary, computer-li...

Researchers identify a key regulator for skin stem cells

...mice blocked differentiation of all three types of mature skin cells -- epidermal, sebaceous, and hair follicle. "We've known for some time that Tcf3 can operate with a co-factor called â-catenin and initiate skin stem cells to make hair follicles. But we hadn't realized that Tcf3 could act on its own to ke...

Global changes alter the timing of plant growth, scientists say

Any gardener knows--different plant species mature at different times. Scientists studying plant communities in natural habitats call this phenomenon "complementarity." It allows many species to co-exist because it reduces overlap in the time period when species compete for limited resources. Now, in...

Transplanted photoreceptor precursor cells restore visual function in mice with retinal degeneration

...mmed" to be, but have not yet become, functionally mature photoreceptors--the light-sensitive cells in the r...on, they survived but failed to integrate into the mature retina. Only one group of cells remained viable: cells that were not yet mature, but had developed ...

New clues to how sex evolves

...need to find a mate before they can reproduce, and mature more slowly." Evolution under the microscope The tandem arrangement and structural similarities of the him and zim genes suggest they all arose from a common ancestor through gene duplication and subsequent selection. This inspired Dernbur...

The effects of smoking on fractures and ligament injuries

... show that there was a delay in the development of mature cartilage cells in the mice exposed to cigarette smoke. This was the first study to analyze the molecular and cellular mechanisms of fracture healing in mice exposed to smoke. The authors note that while the study shows a clear relationship between...

Mutant gene causes severe kidney disease in infants

...We found that PLCE1 is expressed in developing and mature podocytes," says Hildebrandt. "Most of the PLCE1 mutations we identified apparently prevented podocytes from developing normally in the embryo, so defects were present at birth. A milder mutation seemed to interfere with repair mechanisms in the glom...

U of MN researchers turn cord blood into lung cells

... The cells and the air sacs as a whole continue to mature and develop through a child's first few years of life. Now the researchers will try to better characterize the cells, so that in the future, the cells could be used as a research tool to better understand lung development and disease. The cells ma...

Cancer cells forming blood vessels send their copper to the edge

...ntrast to both non-vascularized areas and areas of mature blood vessels, in areas of tissue where blood vessels were newly invading surrounding tissue, the cells showed copper localized at the periphery of the cells and in areas immediately outside of any apparent cellular structures." What are the impli...

Stem cell therapy shows promise in regenerating damaged muscle in heart attack patients

...bone marrow and have the potential to develop into mature heart cells and new blood vessels. The MSC cells a...e designed by nature to perform tissue repair in a mature adult. It is believed that these cells can be used in patients unrelated to the donor, without rejec...

Study of planarians offers insight into germ cell development

...e and development of germ cells. Blocking nanos in mature adults caused their ovaries and testes to disappear. And when the researchers blocked nanos expression in planarians that had had their bodies and reproductive organs detached from their brains, the planarians regenerated new bodies, but with no repr...

Update on census of world's most endangered cat -- Female Amur leopard found dead

...ological Society of London found that the 77 pound mature female leopard was shot in the back side. The bullet came through tail bone, crushed the hip bones and lodged in the belly. She was then beaten to death with a heavy object. “The killing of even one female is a huge loss for a cat on the brink of...

Some caterpillers just don't want to grow up

...ear. The rest are inactive in the first season and mature only after two years. "The question puzzling us fo...ars ?can explain why more than 50% of caterpillars mature in their second season. Yet, according to the currently available data, the effect seems to be too w...

Amur leopard still on the brink of extinction, scientists say

... Academy of Science. According to Dr Pikunov, a mature leopard needs 500 square kilometers of habitat with good forests and high and stable amounts of ungulates, including deer. Two to four female leopards would live in the same amount of land, reproduce and nourish their cubs. "Maybe this is the reas...

The desert is dying

...n Desert of Egypt. In places more than 50% of the mature trees have disappeared between 1965 and 2003, while almost no new trees have been recruited. Despite extreme aridity the main cause of tree mortality seems not to be climate, but commercial charcoal production. This indicates that the traditional and...

Early-stage sperm cells created from human bone marrow

... - cell division - the next stage to them becoming mature sperm cells, although they did not develop further...n get the spermatagonial stem cells to progress to mature sperm in the laboratory and this should take around three to five years of experiments. I’ll be col...

Scientists discover new, readily available source of stem cells

...m these stem cells. The AFS cells can also produce mature cells that meet tests of function, which suggests ...nia. The potential to generate a broad range of mature cell types is why many scientists believe stem cells have promise to replace damaged cells and tissu...

3 proteins may play important role in nerve-cell repair

Some mature brain cells can grow new extensions when the amoun...ture, and this is thought to explain, in part, why mature nerve cells cannot regenerate damaged axons. "Our findings provide additional evidence that cAMP...

Tracking sperm whales and jumbo squid

...ge cephalopod species found only in the Pacific. A mature jumbo squid can weigh more than 100 pounds and grow more than 6 feet long. Sperm whales, the biggest of all toothed whales, inhabit every ocean. An adult male can reach nearly 60 feet in length and weigh 57 tons. The sperm whale was immortalized b...

Major gene study uncovers secrets of leukemia

... differentiation of immature progenitor cells into mature B lymphocytes. The researchers found that the ...tiation, we could push these cells to become fully mature B lymphocytes," Downing said. "And then the body would recognize them as defective B lymphocytes and...

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