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Tag: "necessarily" at biology news

Wisconsin scientists grow critical nerve cells

...s Zhang, demonstrates that human stem cells do not necessarily differentiate in linear fashion, as scientists always believed. Rather, a series of complex overlapping changes may well be the developmental norm in higher vertebrates such as humans. "We cannot simply translate studies from animal to humans," says...

Falling ants glide back to trunk to avoid dangers of forest floor

...common in primitive ants. "This discovery doesn't necessarily say something about the evolution of flight in terms of insect lineages, but it does give us good information about what kinds of morphologies are involved in the transition from just parachuting, or just falling uncontrolled, to being able to contro...

Artifical cornea lets woman blind 20 years see

...e cannot tolerate donor tissue. The problem is not necessarily tissue rejection ? although in some cases it is -- but rather progressive growth of blood vessels and scar tissue throughout an implanted natural cornea, according to researchers. The new cornea eventually becomes as opaque as the original. "The cor...

A new study examines how shared pathogens affect host populations

... counterexample to the idea that sharing pathogens necessarily affects host populations negatively. They show that if there is frequency-dependent transmission, a host can be rescued from pathogen-mediated extinction by the presence of a second host with which it shares a pathogen. Sharing a pathogen among one ...

Microbial forensics: The next great forensic challenge

...that numerous pathogens exist in nature and do not necessarily require sophisticated expertise or technology to be weaponized; many methods could be used by adversaries to perpetrate an attack, from simple to complex; physicians may not diagnose early symptoms of disease if not warned to look for them, increasin...

Rare surgery performed to remove pancreas, prevent diabetes

...e the insulin-producing islets of Langerhans would necessarily be discarded along with the rest of the organ. Patients without functioning islet cells have to take insulin for life. Retrieving and relocating the natural insulin-producing cells from the pancreas saves patients from the complications of severe, po...

Bioelectronic ‘signatures?hold key to DNA mutations

...prising the human genome. Not every SNP found will necessarily cause a mutation or determine our eye or hair color ?but, on average, SNPs occur about once in every 1,000 DNA bases, adding up to 3 million potential individual differences across the human genome. Wang’s method allows for an accurate, ultra-sensiti...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...t nervous and aggressively rumble--but they didn't necessarily leave. I didn't think it was going to be that clear cut." Conservation goals Although still in its infancy, seismic research may ultimately have important applications for elephant conservation. One goal of the 2004 Mushara experiment was to develo...

After a time-shift, mixed signals from the circadian clock

...ings that suggest this adaptation process does not necessarily involve a gradual and synchronous adaptation by the neurons that comprise the central circadian clock--rather, that different components of the clock tend to adapt to a shifted light schedule at two different speeds. The work is reported in the May ...

Study uncovers bacteria's worst enemy

...d so a bacteria's resistance to radiation does not necessarily ensure a tolerance for radionuclides. In fact, the bacteria's worst enemy in a nuclear waste site may not be the radioactive elements, but rather, the other toxic metals that might also be found at the site. The study also shows that contrary to the...

Characterizing Skin Cancer by Microarrays

...riginal research by independent authors and do not necessarily represent the views of the National Academy of Sciences or the National Research Council. ...

Scientists discover global pattern of big fish diversity in open oceans

...n. "I would have never woken up and said that tuna necessarily show the same diversity pattern as plankton. This study is just really neat. It tells us something about the connection of diversity and ocean structure and it shows that human activity is changing those patterns for the largest fish." Hotspots for ...

Tufts researchers shine light on firefly mysteries

...and contribute to the next generation, this is not necessarily a co-operative venture and conflict often arises in nature. "For example, in Drosophila fruitflies, males' efforts to maximize their sperm's competitive ability have led to the evolution of chemicals produced by their reproductive glands. These chem...

Could better mangrove habitats have spared lives in the 2004 tsunami?

...en these seemingly minor alterations, which do not necessarily involve a reduction in mangrove area, have had a profound impact on the damage that the 2004 tsunami inflicted on the coastal zone. This puts the drastic clearing of mangroves, and the conversion of mangrove habitats to shrimp farms in other areas, i...

Stem Cells to Solve the Blood Shortage Problem?

...en these seemingly minor alterations, which do not necessarily involve a reduction in mangrove area, have had a profound impact on the damage that the 2004 tsunami inflicted on the coastal zone. This puts the drastic clearing of mangroves, and the conversion of mangrove habitats to shrimp farms in other areas, i...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...asture and the collection of firewood by many, not necessarily just the pastoralists, reduced range quality. The lesson is that increasing population pressure not accompanied by management practices compatible with the new population size, is the cause of degradation." As populations in drylands increase, espec...

Study casts doubt on 'Snowball Earth' theory

...ed. Skeptics also may argue that the rocks do not necessarily date to a glacial era, Olcott said. But her team f...techniques to an old chestnut. "Geologists don't necessarily think of looking for traces of microbes left in the rocks. This is the first direct look at the ecos...

For first time, brain cells generated in a dish

...nger important, showing that neurogenesis does not necessarily require the environmental cues of the host brain. The natural development of stem cells in the brain is very similar to the lifelong production of blood cells in the human body called hematopoiesis, with "poiesis" derived from the Greek word meaning...

Hybrid grass may prove to be valuable fuel source

...icity needs. Using Miscanthus for energy would not necessarily reduce energy costs in the short term, Heaton said, but there would be significant savings in carbon dioxide production. The Illinois Miscanthus crop began three years ago when Heaton planted 400 Miscanthus rhizomes, which were generated from three ...

Pollution-eating bacteria produce electricity

... The use of bacteria to create electricity is not necessarily a new idea. Other researchers have developed microbial fuel cells using simple sugars or organic waste products. What makes Milliken's and May's discovery so unique is the bacterium itself. It is the member of a genus known as Desulfitobacterium, whi...

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