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Tag: "has" at biology news

Critical role in programmed cell death identified

...ion is a requirement for cell death or a byproduct has been unclear, until now. Conradt and her colleagues determined that mitochondrial fragmentation is required for cells to die and that the process that commits cells to the point of no return happens quickly. Conradt said it's the clearest confirmati...

ASU researchers finds novel chemistry at work to provide parrot's vibrant red colors

... of plumage colors, but their biochemical identity has remained elusive. Now, an Arizona State University researcher has uncovered the chemistry behind the colors of parrots, describing on a molecular level what is respon...

Elephants imitate truck noises, other animals

...s, study co-author Peter Tyack of WHOI said. Tyack has studied the social behavior and acoustics signals of marine mammals, especially dolphins and whales, for decades. "It is exciting to see that African savannah elephants follow a pattern we've seen in other terrestrial and aquatic species capable of ...

UCSD researchers maintain stem cells without contaminated animal feeder layers

...lls in the absence of contaminated animal products has been demonstrated by University of California, San Diego (UCSD) School of Medicine researchers in the Whittier Institute, La Jolla, California. Published in the April 2005 issue of the journal Stem Cells, the study shows that laboratory culture medi...

Transport System Smuggles Medicines Into Brain

... of plumage colors, but their biochemical identity has remained elusive. Now, an Arizona State University researcher has uncovered the chemistry behind the colors of parrots, describing on a molecular level what is respon...

Placenta Is A Rich Source Of Blood Stem Cells

...rta. No role was suspected for the placenta, which has been seen as simply a place for nutrient exchange ...''It is surprising that this role for the placenta has been overlooked for so many years.'' The study, published in the March issue of the journal Develop...

Probing The Promise And Perils Of Nanoparticles

...s in biomedical applications and consumer products has raised concerns about possible harmful effects of ...r for Biologic Nanotechnology, Banaszak Holl's lab has been studying nanoparticles known as dendrimers, tiny spheres whose width is ten thousands times sma...

Open microfluidic and nanofluidic systems

...ut the need to wait several days before the sample has been returned from specialized laboratories. Other...roperties and on the channel design. Such a theory has now been developed. This theory addresses the strong capillary forces between substrate material and...

Researchers discover molecule that causes secondary stroke

...cting vasospasm." A research team led by Dr. Clark has now identified the molecules that trigger vasospasm, a breakthrough, he says, that "raises hopes of developing not only new ways to treat the condition, but also a diagnostic test to determine which hemorrhagic stroke survivors are at greater risk." ...

Study shows nanoshells ideal as chemical nanosensors

... enormouslimitation in the use of Raman scattering has been its extremely weaksensitivity. While it was d...rs of 1 million, this "surface-enhancement" effect has beendifficult to control, predict, and reproduce for practical sensingapplications. Now, Rice resear...

Elephants imitate sounds as a form of social communication

...s, study co-author Peter Tyack of WHOI said. Tyack has studied the social behavior and acoustics signals of marine mammals, especially dolphins and whales, for decades. "It is exciting to see that African savannah elephants follow a pattern we've seen in other terrestrial and aquatic species capable of ...

Highly adaptable genome in gut bacterium key to intestinal health

...ff when its usual source of food is gone, B. theta has evolved an elaborate mechanism for sensing changes in its nutrient landscape and quickly changing its dietary preferences so that it can use whatever is most plentiful. In fact, it can call on a larger repertoire of genes related to carbohydrate dige...

Researchers find missing genes of ancient organism

...Söll. "Or they may represent a specialization that has rid itself of genetic baggage to exist in extreme environments." Understanding how primitive organisms like Nanoarchaea operate gives clues to -- but not proof of -- the relationship between modern and ancient organisms. ### Other authors on the p...

Scientists identify genetic pathways essential to RNA interference

...team based at Massachusetts General Hospital (MGH) has identified 80 new genes essential to the process o...chanisms underlying RNAi could help transform what has been a research tool into a powerful therapeutic tool. Although the process has worked well in studi...

Ants Genetic Engineering Leads To Species Interdependency

...olving the sharing of genes between two antspecies has given rise to a deep-seated dependency between the... involving reliance oninterspecific hybrid workers has left these species unable to surviveindependently of one another.Sara Helms Cahan, Glennis E. Julian...

Same mutation aided evolution in many fish species, Stanford study finds

...e animals adapt to new conditions, or if evolution has other tricks up its sleeve to push organisms towards an optimal form for their environment. Other Stanford researchers who participated in the study include graduate students Pamela Colosimo, PhD, first author on the study, and Kim Hosemann; technic...

Papers of DNA Pioneer and Nobel Laureate Francis Crick Added to National Library of Medicine’s Profiles in Science Web Site

...he National Library of Medicine. “The double helix has not only reshaped biology, it has become a cultural icon, represented in sculpture, visual art, jewelry, and toys.?/p> During a re...

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

...onized by foxes, and in some places the vegetation has begun to look lusher. But it is likely to take dec...study grew out of conversations between Estes, who has been doing research in Alaskan coastal waters for decades, and Byrd, the supervisory biologist for t...

Gene Therapy For Parkinson's Disease Moves Forward In Animals

An international team of scientists has used gene therapy in two separate studies to renew...rotection against Parkinson's disease. But its use has been debated since trials in humans ended last year without showing clinical improvements. Amgen, th...

Researchers trace evolution to relatively simple genetic changes

... Japan used the same gene to evolve low armor, but has no changes at all in the protein coding region. Instead, Kingsley said, "the mutations that we have found are, we think, in the (gene's) control regions, which turns the gene on and off on cue." So it seems that evolution of the fish is based on how ...

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