Tag: "assumptions" at biology news

Ocean Sediments Contain Record of Past Vegetation Fires in Africa

...dioxide changes. If they've been making the wrong assumptions about how much marine carbon is involved, then their estimates about carbon dioxide in the oceans may be wrong." Current models have not been able to determine exactly how the total amount of carbon on earth is distributed. According to Vera...

End Of World Population Growth Projected For 21st Century

...ons andgo up to the year 2100. The projections and assumptions are clearly explainedand substantively discussed in the Project's new, revised edition of "TheFuture Population of the World: What Can We Assume Today?" (ed. W. Lutz),just off press. "The biggest factor affecting population growth is the continuin...

Research Aims At Nation's First 'Smart' Ground Water Regulations

...lt of all. "If 'smart' regulations are to be used, assumptions that were implicit in the old regulations would become explicit in the new ones, and that makes it a whole new ball game," Engel says. For example, assume, hypothetically, that current pesticide regulations were written so that there is a 10 percent ...

Low Cholesterol? Reduced Sodium? What Do These Terms Really Mean?

...efinitions do not correspond to consumers' natural assumptions about therespective quantities indicated. When a consumer sees a product with a labelsuch as "reduced cholesterol," she may make an incorrect assumption about thecontents of the product. This can lead to significant health consequences. The large va...

Largest Generation Of Adolescents Faces Reproductive Health Risks

...find that in Kenya, teachers perpetuatetraditional assumptions about gender roles. Teachers exhibit a double standardregarding sexual activities, and they have lower expectations for adolescentgirls than for boys. Although they are treated poorly, girls have much to gainfrom doing well in school, the authors co...

The Perils Of Discontinuing Therapy: Without HAART, Cytokines Stimulate HIV From Latently Infected Cells

...em to spit out virusunder the cover of HAART. Two assumptions are built into this scenario: cellsactivated to produce virus will die, and HAART will prevent the spread ofreleased virus. "Our group and others are pursuing further laboratory studies as well asclinical trials with HIV-infected patients to determin...

Ecological Consequences Of Jasmonate-Induced Responses For Plants In Native Populations

... inducible responses are adaptive, two critical assumptions remain untested. Surprisingly, it has yet to be demonstrated that an inducible complexities of ecological interactions in nature frequently wreak havoc with the best defense strategies. For example, plant chemical defenses are frequently ...

Tumor Oxygen Level And Blood Flow Fluctuate, Duke Scientists Discover

....The Duke animal study, which contradicts previous assumptions about tumors,could be important because the two major cancer treatments, radiation andchemotherapy, depend on a constant high oxygen level and steady blood flowwithin a tumor, scientists said. "These fluctuations in oxygen level and bloodflow are no...

NYU Chemist Supports New Theory For Origin Of Life

...lished a new bookand paper that challenge existing assumptions about life on Earth and elsewherein the Universe. In Planetary Dreams, Shapiro raises the issue of whether thatlaws of nature might favor the generation of life throughout the Universe. Furthermore, Shapiro suggests that the hypothesis that life is u...

Molecular biologists prune branches from the animal family tree

...ng animal relationshipsis at the foundation of the assumptions we make when we do experiments on anyanimal," says Carroll. The new understanding should also prompt changes in the way students aretaught, Grenier says. "We're hoping this will have an impact on undergraduateclasses," she says, "if only to emphasiz...

From lemurs to gorillas, new book explains primate anatomy

...ble, with flexible capacities that confound simple assumptions about theirnatural behavior. "If you look at a horse, you can tell that it's never going to climb atree. But primates are very different. A change in their environment can make anenormous difference in their behavior. "Take our own lo...

We are not alone - or are we?

... Brownlee said. He and Ward acknowledge that their assumptions about how uncommon advanced life might be in the universe are based on observed conditions that allowed evolution on Earth. But this is the only place in which advanced life is known to have occurred, and it is one of only a handful of places in the ...

Roads affect 20% of U.S. land

...and. Forman based his estimate on the conservative assumptions that the average "road-effect zone" extends several hundred feet on each side of roads in rural areas and half a mile in heavily-traveled developed areas. He got these distances from his own study in Massachusetts and studies by others in the Netherl...

New science resources available from the ESA

...und forest management policy and exposed erroneous assumptions that underlie a number of current proposals. A review of recent literature for example, found that forest reserves are much more likely to sustain a wide diversity of plant and animal life than lands managed primarily for timber production. Further...

UC Berkeley psychologist finds evdence that male hormones in the womb affect sexual orientation

...rth. "This calls into question all of our cultural assumptions that gay men are feminine," said Breedlove. He said his findings are consistent with other, very sketchy indications that some gay men are hypermasculinized, having a greater average number of sexual partners in a lifetime than heterosexual men, high...

New theory on the mystery of the origin of life proposed by Weizmann Institute scientists

...ied. The scientists' model makes very few chemical assumptions and derives a rich molecular behavior reminiscent of life processes. It therefore has the potential of constituting the long-sought bridge leading from the inanimate world to that of living organisms. This research has already attracted consider...

Ancient math refines theories of evolution

...out that in drawing the evolutionary tree, certain assumptions must be made because the relationships between species--the starting evidence--is not absolutely known. Huelsenbeck says, "Bayes gave us a way to climb a little higher, even if we aren't so sure of our footing."...

New study shows bison dont favor groomed roads in Yellowstone National Park

...nt is off road. The results challenge several assumptions about the ecological role of groomed trails on bison survival and behavior. For example, the study yielded no evidence that the animals use groomed roads for travelling long distances. Most--68 percent--travelled less than 1 kilometer while on gr...

Humans at work and play in high altitude environments

...Southwest China since 1980, Ives said that several assumptions have proven to be false. For example, contrary to past belief, deforestation of the Himalayas as a result of tree cutting by rapidly expanding mountain populations, is not the primary cause of soil erosion, landslides and devastating floods in Gange...

Language can fuel, or abate, public fears about bioengineered foods

...ion problems flawed rhetorical choices and faulty assumptions by scientists about the role of language, emotion and values in communicating with the media and public," he said. Katz will present "Language and Persuasion: The Communication of Biotechnology with the Public," at 9 a.m. PST (noon EST) Sunday, Feb....

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