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Tag: "rise" at biology news

Insects that produce males from unfertilized eggs reveal a surprising cellular feat

... there is no centrosome in the egg that could give rise to new ones. We found that the accessory nuclei se...nd showed that the accessory nuclei appear to give rise to centrosomes. Accessory nuclei bud off from the membrane of the nucleus, the cellular structure ...

Protein finding could lead to treatment for inflammatory diseases

...incidence of MCV infections has increased with the rise of AIDS. MCV is an opportunistic infection in immunocompromised people, with MCV lesions growing very large and persisting for much longer periods, even years, in this population, Shisler said. "This virus makes other proteins that dampen the immune...

Genomics-based vaccine could prevent deadly cattle disease

...ast fever kills cattle kept by families trying to rise out of poverty. If researchers are successful, Nene notes, the entire region will have new reason to hope for a better life. Evans Taracha, ILRI project leader, also highlights the importance of strategic research partnerships to overcome this and si...

World shark attacks dipped in 2005, part of long-term trend

...century, with apparent increases coinciding with a rise in population and Australia's growing attraction to tourists in recent decades, he said. The number of shark attacks at any particular time depends on a variety of factors, including oceanographic and meteorological conditions, abundance of prey it...

Alternatives to the use of nitrate as a fertiliser

...ogenated fertiliser in intensive farming has given rise to environmental problems such as the contamination of water or the degradation of the ozone layer. There are also health problems such as deficiencies in the oxygenation of blood in breast-feeding mothers or the accumulation of nitrosamines, substan...

Cloned stem cells prove identical to fertilized stem cells

...a dish, most die. A few, however, survive and give rise to an embryonic stem cell line, and these appear to be thoroughly reprogrammed. Researchers have tried to test the integrity of these surviving stem cells by transplanting them into fertilized blastocysts and then observing the overall health of th...

Front-line immune cells mature in four stages, study shows

...th a protein called CD34 on their surface can give rise to NK cells. They also knew that mature NK cells lack CD34. But how and where the CD34-bearing cells became mature NK cells was not understood. For this study, Caligiuri, Freud and their collaborators analyzed tissues from more than 50 tonsils and ...

Treating populations infected with HIV and latent TB could speed the emergence of drug-resistant TB

...sters of Health in Africa declared that a dramatic rise in tuberculosis (TB) cases was cause for emergency. In some African countries, annual TB case notifications have increased as much as four-fold over the past 15 years. The main culprit? The emergence of HIV. When individuals are infected with both HI...

Researchers solve mystery of how nuclear pores duplicate before cell division

...rescent tag. If the nuclear pore had split to give rise to two daughter pores, two bright dots would have emerged from one; however, the researchers tracked movement of only one dot, confirming their previous finding that pores formed from scratch. Additional research demonstrated that nuclear pore assem...

Warming trend may contribute to malaria's rise

...f millions of people worldwide and has been on the rise in some highland regions and desert fringes. Because the life cycle of the mosquito that transmits malaria and the microorganism that causes the disease are extremely sensitive to changes in temperature, some scientists have speculated that rising av...

There's something fishy about human brain evolution

...ionary biologists usually point to things like the rise of language and tool making to explain the massive expansion of early hominid brains. But this is a Catch-22. Something had to start the process of brain expansion and I think it was early humans eating clams, frogs, bird eggs and fish from shoreline...

New drug could reduce tissue damage after heart attack

...id arthritis and Crohn's disease. CRP levels also rise dramatically after a heart attack. Patients with the greatest and most persistent increases in CRP concentration suffer higher mortality, and CRP is always deposited in and around the damaged heart tissue. Inflammation contributes significantly to...

Of mice, men, trees and the global carbon cycle

...o predict how fast atmospheric carbon dioxide will rise in the future, it is important to know all the sources that emit the gas and all the sources that soak it up. The amount of carbon dioxide in the atmosphere is well known, as is the rate of emissions from fossil fuel burning. The rate of photosynthes...

Powerful new tool for studying brain development

...rain cells, called radial glial cells, likely gave rise to ependymomas. "Our demonstration that identical-looking ependymomas that arise in different regions of the central nervous system are distinct diseases because they arise from different stem cells is an important insight," said Richard Gilbertson...

Neurons find their place in the developing nervous system with the help of a sticky molecule

...superficial" part of the developing cortex, giving rise to a laminar structure. Neurons forming layers 2 and 3, the focus of the current study, are born last and so must elbow their way through cells lying in earlier formed layers to reach what will become the outermost layers. Without MDGA1, these neuron...

HIV/AIDS rates in Tijuana, Mexico increasing at alarming rate

...es based on the 2000 Mexican census. The dramatic rise in HIV infection may be linked to a number of factors including Tijuana's proximity to the United States, which creates economic opportunities that attract migrants from elsewhere Mexico. Such migration is linked to lower socio-economic status, soci...

Tropical Atlantic cooling and African deforestation correlate to drought, report scientists

... hardship, triggering population migration, giving rise to changes in the modes of agricultural production, and influencing the fall or rise of civilizations." Weldeab points out that the past 50 years are marked by deforestation and overgr...

Asleep in the deep: Model helps assess ocean-injection strategy for combating greenhouse effect

...re pitfalls in that plan. The carbon dioxide can rise toward the surface, turn into gas bubbles and vent to the atmosphere, defeating the purpose of the whole grand scheme. Even worse, if the liquid-to-gas conversion happens suddenly, the gas can bubble up in a plume and erupt---a potential hazard. Sm...

RNA splicing occurs in nerve-cell dendrites

...ctivated, it may be spliced and translated, giving rise to many different proteins." Protein diversity ...egulation or proper expression in neurons may give rise to cognitive dysfunction. "Most neurodegenerative and psychiatric illnesses exhibit dendrite dysfunc...

Same-sex mating by fungi spawned infection outbreak, evidence suggests

...e represents one of two parental strains that gave rise to the major outbreak isolate," said study author James Fraser, Ph.D., also of Duke. "The second parent strain remains to be discovered." Additional examination of the mating type locus provided evidence that the major outbreak isolate may have resu...

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