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Tag: "four" at biology news

One species, many genomes

...ry 180th DNA building block is variable. And about four percent of the reference genome either looks very different in the wild varieties, or cannot be found at all. Almost every tenth gene was so defective that it could not fulfill its normal function anymore! Results such as these raise fundamental qu...

Art and music for the birds

...ine feathered friends with an exhibition featuring four 10-foot red perches offering what are considered to be the best in classical, rock, country, and jazz for local birds. Demaray’s concept of art for the birds hatched from a conversation with co-creator John Walsh, a video artist, who sent Demaray s...

Researchers discover inherited mutation for leukemia

... mutation by testing a family in which the father, four sons, a grandson and a distant female relative developed this form of leukemia. The chemical change is called DNA methylation. Healthy cells use this process to silence unneeded genes. But abnormal DNA methylation can turn off genes that control ...

Researchers find 24 species believed new to science in Suriname rainforest

...e an Atelopus frog with brilliant purple markings, four Eleutherodactylus frog species, six species of fish, 12 dung beetles and an ant species. The scientists also found 27 species endemic to the Guayana Shield region comprising Suriname and neighboring Guyana, French Guiana and northern Brazil, includin...

Gene therapy delivery of nerve growth factors reverses erectile dysfunction in animal model

... factors were able to regain normal function after four weeks, according to a study conducted by Universit... AP compared with the control or untreated mice at four weeks after treatment. Fluorescent protein studies also showed that the delivered genes had been eff...

The insect vector always bites twice

...c antibodies (2). The different saliva proteins of four Glossinia species, uninfected, vectors or non-vectors, were separated then put into contact with the serum of individual subjects, infected or uninfected, exposed to bites. Comparison of salivary protein immunogenic profiles obtained showed that they...

Loss of stem cells correlates with premature aging in animal study

...ying, hair loss, and osteoporosis, within three to four months. To be able to renew itself, most tissues have a reservoir of specific adult stem cells. These stem cells don’t divide as frequently as other cell types since they need to maintain the integrity of their DNA, and multiple divisions lead to...

New collaborative research reveals chimpanzees can sustain multiple-tradition cultures

...traction techniques to high-ranking individuals in four different captive chimpanzee communities. Researchers then observed as those individuals passed on the techniques to other members of their communities. The researchers included Frans de Waal, PhD, Victoria Horner, PhD, and Kristin Bonnie from the Ye...

Massive herds of animals found to still exist in Southern Sudan

...eight, they began an aerial survey of three of the four blocks surveyed earlier: Boma National Park, Jonglei region and Southern National Park. Covering more than 58,000 square miles (150,000 square km) and 150 hours of survey time, the team used a survey technique of flying systematically along transects...

Women well informed about breast cancer, yet lacking knowledge about current treatments

...progress made in treatment. Fewer than one out of four (23 percent) women ages 50-65 have heard of new th...apy and radiation. However, fewer than one out of four had heard of newer therapies such as aromatase inhibitors or monoclonal antibodies, nor were they in...

Genetic factors are linked to fever following smallpox vaccination

...ew study identified a total of eight haplotypes in four different genes that were associated with altered susceptibility to fever after vaccination. It is the first study to show that fever after smallpox vaccination is associated with specific gene clusters in the interleukin-1 (IL-1) gene complex on chr...

Marine phytoplankton changes form to protect itself from different predators

... which prefer to eat small solitary cells that are four to six microns in diameter, and the larger shrimp-like copepods, which prefer to eat large, ball-shaped colonies. When copepods are attacking the phytoplankton, therefore, the best survival strategy of Phaeocystis is to form solitary cells. When ...

Staphylococcus aureus hides out in cells

...d. Although most of the bacteria had died by about four days as a result of antibiotic treatment, the team still found viable bacteria in their model system two weeks after infection. The findings may help in understanding persistent infections, and in designing new antibacterial drugs. S. aureus has ...

Potent possibilities for parasite attack

...." Around 350 million people in 88 countries on four continents are at risk of Leishmaniasis and its incidence has risen sharply over the past ten years. It is transmitted by the bite of various species of sandfly: wild and domesticated animals - as well as humans - act as a reservoir for the disease....

Mutating the entire genome

...shaped molecule made from numerous “base pairs” of four building blocks: nucleic acids designated A, C, G and T. DNA in each human cell has about 3 billion base pairs, arranged into 23 pairs of chromosomes. Those chromosomes include roughly 20,000 genes, which carry the code needed for cells to produc...

Prey not hard-wired to fear predators

... the Study The study compared the behaviors of four species of prey animals in three different prey situations: Locations were native predators still exist. (Eastern Siberia, Boreal Canada and Alaska) Locations where the top predators no longer exist. (the polar islands of Greenland ...

Electric fish conduct electric duets in aquatic courtship

...lectrical pulses based on sex. They video recorded four pair of mating mormyrids (a feat in itself, since the species rarely breeds successfully in captivity) and identified nine common motor displays and 11 specific pulse sequences common to courtship and mating. "Knowing the electrical and motor patt...

The mouflons of the Kerguelen archipelago

...e Kerguelen Islands in the Indian Ocean are one of four districts in the French Austral and Antarctic Territories. These islands, one of the most isolated places on Earth, house a military base and a science station. In 1957, the local authorities decided to offer residents the opportunity to hunt mouflon...

Male circumcision overstated as prevention tool against AIDS

...ests that the reason is that Africa as a whole has four times as many prostitutes as the rest of the word and they are more than four times as infected. Some southern Africa countries have as many as 7% of their adult females infected...

Gene therapy study shows safety and statistically significant improvement in Parkinson's disease

...2 patients with advanced Parkinson’s disease, with four patients in each of three dose-escalating cohorts. All procedures were performed under local anesthesia and all 12 patients were discharged from the hospital within 48 hours of the procedure. At one year, all 12 patients as a group demonstrated a cli...

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