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Tag: "preserved" at biology news

Studies to find better ways to preserve human eggs, ovarian tissue under way

...ays. Later, researchers will put ovarian tissue preserved both ways into mice to see if it survives and starts making proper connections. “The reason for using ovaries is when you have cancer, if you need chemotherapy, you often don’t have time to go through stimulation cycles to get oocytes,” says Dr. E...

Physicist cracks women's random but always lucky choice of X chromosome

...of both the maternal and paternal X chromosome are preserved in the gene pool and the resultant population thus has more chance of surviving any biological threat targeted at a single version of the X chromosome....

CT scan reveals ancient long-necked gliding reptile

...sil specimens and the image data from the scan are preserved and can be reviewed and reanalyzed in the future. The scans presented to Fraser were not a perfect photograph of the two specimens, rather they were a set of thin slices that had to be processed to obtain information about the animals. Even then,...

Ice Age extinction claimed highly carnivorous Alaskan wolves

...acted mitochondrial DNA from the fossil wolf bones preserved in permafrost and compared the sequences, called haplotypes, with those of modern-day wolves in Alaska and throughout the world. The fossils showed a wide range of haplotypes—greater in fact than their modern counterpart—but there was no overlap with...

Definitive evidence found of a swimming dinosaur

...2-3 scratch marks each. Each set of scratch marks, preserved in a layer of sandstone, averages approximately 50... categorized as ghost traces, possible undertracks preserved in lower layers of sediment. "The trackway at La Virgen del Campo opens the door to several new ...

Machine preservation may promote more organ sharing

...nly 21 percent of kidneys from deceased donors are preserved on a pump. The purpose of this study was to com...older deceased donors based on whether organs were preserved by pump or cold storage. "The critical organ shortage poses a challenge to optimize the use and f...

Study of protein folds offers insight into metabolic evolution

...lso the most ancient. "Protein architecture has preserved ancient structural designs as fossils of ancient biochemistries," the authors wrote. The team used data from two international compilations of genetic and proteomic information: the metabolic pathways database of the Kyoto Encyclopedia of Genes an...

Remote sheep population resists genetic drift

... some samples of teeth, bone and fur that had been preserved from the Vincennes Zoo since in the 1950s. DNA samples from subsequent generations were taken from the mouflon that had been kept as hunted "trophies" in the 1960s, and then scientists arrived in the '70s and began collecting samples themselves. "...

Massive coral death attributed to earthquake

... says: "Amazingly, the uplifted corals are so well preserved we could still identify each species, despite these colonies having been exposed for two years. Some species suffered up to 100 percent loss at some sites, and different species now dominate the shallow reef." "This is a unique opportunity to docume...

Protein fragments sequenced in 68 million-year-old Tyrannosaurus rex

...d, second, ensure that whatever is there gets well preserved because it can be interrogated." The scraps of ...l, it may be the rare fossil that is as pristinely preserved by the environment as the T. rex and mastodon specimens analyzed in the current study. "Nature has t...

Paleontologists discover new mammal from Mesozoic Era

...s can be explained by evolution, using exquisitely preserved fossils," said H. Richard Lane, program director i...e a definitive piece of evidence, in a beautifully preserved fossil split on two rock slabs," said Luo. "Yanoconodon clearly shows an intermediate condition in t...

The origin of the brain lies in a worm

...nment as the last common ancestors used to and has preserved many ancestral features, including a prototype invertebrate CNS." Arendt and his group investigated how the developing CNS in Platynereis embryos gets subdivided into the regions that later on give rise to the different CNS structures. The regions ...

Microfossils unravel climate history of tropical Africa

...ments where oxygen does not penetrate, they can be preserved for thousands of years. The ratios between the different molecules from the algal cell membrane can be used to approximate the past temperature of the sea surface. These techniques are therefore called 'proxies'. New method to measure soil tempe...

Dig deeper to find Martian life

...when frozen as in the subsurface of Mars, they are preserved but unable to repair the damage, which accumulates to the point where the cell becomes permanently inactivated. Mr Dartnell said: "With this model of the subsurface radiation environment on Mars and its effects on the survival of dormant cells we ...

St. Jude announces breakthrough in eye cancer treatment

... also increase the chance that their vision can be preserved by eliminating the tumor and preventing its spread from the eye to the rest of the body." The discovery that blocking MDMX releases the apoptosis response in retinoblastoma has important implications for certain forms of adult cancers as well. "So...

Ancient ape ruled out of man's ancestral line

...n by a local South African team in 1997. Its bones preserved in sediment layers, it is the most complete homini...isintegrated, but here the feet and hands are well preserved - and these could enable researchers to show how well adapted this early primate was to walking on t...

Extreme environment changes fish appearance

...nvironment, is it still the same fish if it is not preserved in the same habitat? "What is it that we try to preserve -- just genetics, or the habitat that makes them unique?" Lema said. ...

Researchers barcode DNA of Venice museum's vast fungi collection

...am is collecting samples from the largest and best preserved collection of fungi in Italy to create an unprecedented DNA database. These 28,000 samples of fungi that represent 6,000 species - many of which are quite rare - are housed at the Venice Museum of Natural History, a partner with UC Berkeley for this...

'Nymph of the sea' reveals remarkable brood

...an ostracod (a relative of the shrimps) - which is preserved exceptionally in volcanic ash rocks in Herefordshire. Their findings are published on line in the Proceedings of the Royal Society. Professor David Siveter, of the Department of Geology at the University of Leicester, said : "Ostracods are common,...

New evidence of early horse domestication

...place by calcium and iron and is more likely to be preserved in the soils for millennia. As it turned out, the soil from inside the alleged corral had up to ten times the phosphorus concentration as the soils from outside the settlement. Lots of phosphorus can also indicate a hearth, said Capo, but that phos...

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