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Tag: "contrary" at biology news

Plants respond similarly to signals from friends, enemies

...scientists also discovered that, like rhizobia and contrary to popular belief, the root-knot nematode signals plants from a distance and therefore does not need to attach itself to the plant to elicit a response. When the researchers studied L. japonicus plants missing the receptors that receive signals from...

The very unexpected life and death of a leukemic cell

... death rates of the leukemic cells and found that, contrary to expectations, production and destruction of CLL cells is highly variable, and does not exhibit a steady birth and death rate as previously thought. The data also reveal that a correlation exists between the rate at which CLL cells are born and th...

US life expectancy about to decline, researchers say

...ancer or ischemic heart disease. The findings are contrary to what some scientists predict about human life expectancy, which assumes that past increases will continue indefinitely. Most forecasts of life expectancy are based on historical trends, but the authors conclude that such estimates fail to consider...

Canadian youth 4th highest in international obesity study

... Along with this alarming finding is one that runs contrary to what the research team expected. Surprisingly, as consumption of candy and chocolate increased, the likelihood of being overweight decreased. "This does not mean that eating sweets in large quantities is recommended for young people," says Dr. Ja...

UN votes to ban human cloning

...banned "genetic engineering techniques that may be contrary to human dignity" and called for a prevention of the exploitation of women and adequate protection for human life in the application of life sciences. The Declaration has been welcomed by many as a clear expression of the ethical norms that should gu...

Study uncovers bacteria's worst enemy

...o be found at the site. The study also shows that contrary to the conventional wisdom, when it comes to these environmental bacteria, plutonium is less toxic than uranium and, in general, actinides are less toxic than other types of metals. This suggests that actinide toxicity will not impede bioremediation ...

Geckos: It's not always about sex

...eckos doesn't need sex or a male to reproduce and, contrary to expectations, these "Wonder Woman" geckos can run farther and faster than their sexually reproducing relatives. The research findings are published in the journal Physiological and Biochemical Zoology (Vol. 78, 3, May/June 2005) by Michael Kearney...

New amphibian species result from exploration, not from rule changes

... Institute of Biological Sciences, indicates that, contrary to some published expert opinions, new amphibian discoveries are a consequence of increasing exploratory effort, not of changing criteria for recognizing a species, or "taxonomic inflation." The authors of the new analysis, Jörn Köhler of the Hessisc...

Amazon trees much older than assumed, raising questions on global climate impact of region

... on Earth. These results, Trumbore points out, are contrary to the widely held view that tropical forests are highly dynamic. "In addition, the impact of logging activity in the Amazon region may be longer-lasting than we think," Trumbore added, "because it may take centuries for these forests to grow back...

Lack of a key enzyme dramatically increases resistance to sepsis

...eneficial effect of cytokine hyper-production runs contrary to some of the current thinking in sepsis research," Ulevitch said. "The general thinking is that this initial cytokine 'storm' is harmful, and that belief has been the basis of a number of unsuccessful clinical studies. In our study, cells containin...

Paleontologists learn how not to become a fossil

..., issue of the journal Science. That study showed, contrary to longstanding expectations, that clams with durable shells were not better represented in the fossil record than those more prone to dissolving. The PNAS co-authors suggest three remedies for dealing with the weaknesses they've documented in the f...

Efficiency, not more doctors, is the prescription for aging population

...ve in areas with fewer physicians per capita. But contrary to popular belief, patients who have more doctor visits and treatments do not realize a benefit. Indeed, evidence shows they may actually be harmed by unnecessary medical care, Goodman said. If all medical practices adopted the practice style and re...

Free-radical busting antioxidants might not promote healthy hearts

... molecule was doing the beneficial work. In fact, contrary to widely accepted opinion, the group found no relationship between the levels of oxidized cholesterol in blood vessels and the severity of heart disease. This might help explain the disappointing results of clinical trials with other free radical-sc...

Stanford snake venom study shows that certain cells may eliminate poison

...ior author. This helpful mast cell response runs contrary to the conventional wisdom - that the immune system only added to the woes of snakebite victims. This assumption arose because of the way mast cells respond to certain other stimuli. Mast cells synthesize a wide range of biological mediators - comp...

Five surprising facts about starvation that could change the international agenda

...s to prevent future public health crises. First, contrary to popular belief, Africa does not have the most children suffering from wasting. "Although in the past 10 years, every subregion of Africa saw a rise in both the number of wasted children under the age of five and in the overall rate of wasting, abo...

UGA researchers find that hunting can increase the severity of wildlife disease epidemics

...e," Choisy said. "It can give you results that are contrary to what you expect." The reasoning behind killing wild animals to control disease outbreaks is simple: fewer animals should result in reduced transmission of disease. Hunting has been used to control badger populations in England, rabies in Europea...

Surprise finding for stretched DNA

...overwinding observed upon stretching, implies that contrary to the held belief, the stretch-torsion coupling constant of DNA is a negative value. This observation also implies that if we overwind the DNA, the molecule should get longer. Indeed, we found that Overwinding caused the DNA molecule to extend by a...

Making a face: A new and earlier marker of neural crest development

... neural or mesodermal tissues. "Our results are contrary to current text-book models and suggest that different modes of neural crest induction operate during development," said Martín García-Castro . "Interestingly, the one we have uncovered is related to the early, cranial neural crest cells, the only o...

Evolution reveals an independent route for diversity in animal form

... long. One clear implication of the paper is that, contrary to expectations, the Hox system is not necessary for the elaboration of substantial morphological complexity. ...

UCSD study reveals how plants respond to elevated carbon dioxide

...energy source. However, studies have shown that, contrary to expectations, increased carbon dioxide does not accelerate plant growth. Previous research has also shown that the doubling of atmospheric carbon dioxide expected to occur this century can cause leaf stomata to close by 20 to 40 percent in diverse...

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