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Tag: "rise" at biology news

New clues to how sex evolves

...genetic material from parents to recombine, giving rise to a unique new genome. But how did sex itself evo...me. The observation that a mutant him 8 gene gives rise to a high incidence of males is what gave the gene its name. "In all organisms, sex chromosomes ...

Global changes alter the timing of plant growth, scientists say

...bling of atmospheric carbon dioxide; a temperature rise of 2 degrees Fahrenheit; a 50 percent increase in precipitation; and increased nitrogen deposition--as a likely byproduct of fossil-fuel burning. Scientists applied each of the four experimental treatments--elevated carbon dioxide, warming, increas...

Life in the extreme

...scovered in the 1990s. These harsh conditions give rise to some of the most extreme and scientifically challenging environments for life to exist on the planet. Extensive fields of hydrocarbon-rich gas seepage, mud volcanoes and pockmarks have all been mapped by the EUROCORES programme EUROMARGINS. On 4...

Molecules in blood foretell development of preeclampsia

... preeclampsia, levels of soluble endoglin began to rise in the 17th to the 20th week of pregnancy. In wom...n with gestational hypertension had a simultaneous rise in soluble endoglin, and an increase in the ratio of sFlt1 to PlGF (high levels of sFlt1 and low lev...

Reef warns of sea level rise

...happen again as global CO2 levels and temperatures rise during the 21st century. "We've dated the reef t... Greenland or the Antarctic. It is the very rapid rise in sea level from catastrophic melting of landbased icesheets where there the greatest uncertainty a...

Malaria may fuel spread of HIV in sub-Saharan Africa

...of the immune system by HIV infection has fueled a rise in adult malaria-infection rates and may have facilitated the expansion of malaria in Africa," said Kublin, an HIV/AIDS scientist in the Hutchinson Center's Clinical Research Division. Using a mathematical model designed by Abu-Raddad that was base...

Researchers identify new weapon to fight deadly bacterial sepsis

...logists blame this large increase on the explosive rise in antibiotic-resistant bacteria caused by overuse of antibiotics as well as on the increasing numbers of people living with immune systems weakened by HIV, using immune-suppressive therapy for organ and bone marrow transplants, and receiving high-do...

University of Iowa scientists explore function of 'junk DNA'

...icroRNAs -- short segments of RNA that do not give rise to a protein, but do play a role in regulating protein production. In their study, Davidson and colleagues not only discovered that microRNAs could be expressed in a different way than previously known, they also found that some of the junk DNA is no...

End of deforestation in view? Experts advance new way to size up global forest resources

...al scale would mean that atmospheric CO2 might not rise as fast as many fear." As well, forest transitions are good news for wildlife like tigers and moose whose forest habitat has been decimated by human activity. Skinhead Earth? Earlier research showed farmers have so successfully learned to ex...

'Allergy cells' can aggravate cancer and psoriasis

...er the release of a number of substances that give rise to the classic allergic symptoms, such as swelling, congestion and itching. The explosive reactions are activated when an allergen (such as pollen particles) binds to receptors on the surface of the mast cell, which then opens and secretes part of it...

Key gene controlling kidney development found

...able to produce the differentiated cells that give rise to specialized parts of the organ, according to in...eting the population of stem cells that could give rise to differentiated cells needed to form the kidney. The researchers also found that Six2 works by s...

Stem cells found in adult hair follicles may provide alternative to embryonic stem cells

... array of cell types and tissues and actually give rise to the autonomic and enteric nervous systems along with endocrine cells, bone and smooth muscle cells. The cells can be isolated from the hair follicle bulge as multipotent stem cells, and then expanded in culture into millions of cells without losin...

New research shows big improvement in survival after stroke

...ific populations in New Zealand have experienced a rise in stroke rates. Even with declines in the rate of stroke, the number of strokes occurring is expected to rise, with the ageing of the population and improved survival. In three separate studies between 1981 and 2003, researchers investigated t...

Researchers make nanosheets that mimic protein formation

...hat the unique shape of the CdTe nanocrystals gave rise to a combination of forces that conspired to produce the unusual two-dimensional packing. Subsequent experiments by Kotov's group showed that if any of the forces were missing, the sheets would not form, confirming the simulation predictions. "S...

'Tribbles' protein implicated in common and aggressive form of leukemia

...hematopoietic stem cells, the cell type that gives rise to all elements of the blood." Three lines of evidence implicate Tribbles in AML. First, all mice engineered to express Tribbles-2 (Trib-2) in hematopoietic stem cells developed AML. They also found that Trib-2 inhibited C/EBPá, another protein th...

Exposure to dioxins influences male reproductive system, study of Vietnam veterans concludes

...the urgency of further research is underlined by a rise in disorders of the male reproductive tract over the past several decades. These include a decrease in sperm production by almost 50 percent, a three- to four-fold increase in testicular cancer, an increase in the incidence of cryptorchidism (unde...

Fighting like a girl or boy determined by gene in fruit flies

...ogy of aggression and how the nervous system gives rise to different behaviors. "Aggression is a very serious problem in society, and it's a problem with a biological and genetic component," said co-author Edward Kravitz, the George Packer Berry professor of neurobiology at HMS, who developed the fruit...

Twenty Years of Malaria Research: Outcomes and Perspectives

...tion therapies (ACTs) aimed at combating the rapid rise in drug-resistance. The unit has carried out the largest number of drug trials in malaria and research at the unit has been influential in changing WHO guidelines for malaria drug treatment. The reduction in the number of malaria cases has allowed...

Male chimpanzees prefer mating with old females

... more frequently with high-ranking males, and gave rise to higher rates of male-on-male aggression in mati...e human lineage sometime after the lineages giving rise to humans and chimpanzees diverged. ...

New moth variety disarms plants guarded by selenium

... from herbivory by some invertebrates, it can give rise to the evolution of unique selenium-tolerant herbivores, thereby providing a "portal" for selenium into the local ecosystem--that is, a pathway by which selenium hyperaccumulation may spread within parts of the food web. The authors point out that...

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