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Tag: "study" at biology news

World's largest rainforest drying experiment completes first phase

... soil, they would shed their leaves. In fact, this study shows that the reaction to drought is instead a decrease in the rate at which tree trunks grew in diameter. Many small trees, measuring 4 to 10 inches in diameter, simply stopped growing during the end of the dry season of 2000, following the first p...

Family trees of ancient bacteria reveal evolutionary moves

...f growing under sediments to avoid the light." To study the evolution of Cyanobacteria, Blank drew up a backbone tree using multiple genes from whole genome sequences. Additional species were added to the tree using ribosomal RNA genes. Morphological characters, for instance, the presence or absence of a ...

In the migratory marathon, parasitized monarchs drop out early

...l become heavily parasitized. More generally, this study demonstrated that seemingly small effects of parasites on their hosts could have a much larger impact when combined with the stresses of long-distance migration. ...

Scientists discover how fish evolved to float at different sea depths

...riety of fishes we have in our oceans today." The study revealed that the special blood proteins, which are essential for oxygen secretion, were present in the eye system 250 million years ago. This predated the swimbladder system by 100 million years. The special blood proteins induced development of the...

Scientists find fossil proof of Egypt's ancient climate

...l thousand years. Normal rainfall in the area they study is a minuscule 0.7 of a millimeter per year, but there is evidence that the rainfall amounts in the region have gotten up to as much as 600 millimeters per year, "not enough to make it a paradise," Smith said, "but enough to turn a barren environment...

Implanted Devices Detect High-Risk Heart Failure Patients

...atients, the researchers said. The results of the study were presented by Duke cardiologist Roosevelt Gill...illiam, chief of electrophsysiology at Duke. "This study shows that changes in heart rate variability just might be better in picking out those people at hig...

VCU Researchers Identify Networks Of Genes Responding To Alcohol In The Brain

...tions from alcohol," he said. Also working on the study were the University of Tennessee Health Sciences; the University of Memphis; the University of Colorado; and the University of California at San Francisco. ...

Rush Physicians Using Gene Therapy For Heart Patients With Moderate To Severe Chest Pains Who Do Not Benefit From Other Treatments

...sels in the heart. The phase II clinical research study uses vascular endothelial growth factor-2 (VEGF-2)...iduals who may be candidates for this gene therapy study trial must have moderate to severe angina, but cannot also be candidates for treatment using angiopl...

Self-assembled nano-sized probes allow Penn researchers to see tumors through flesh and skin

...e polymersome membrane has a hydrophobic core. The study shows that the fluorophores evenly disperse within this core, giving rise to a nanometer-sized light-emitting structure. "These polymers are also larger than phospholipids, so that there is enough space for the fluorophores, which are larger than th...

Ophthalmologists Use Artificial Silicon Retina Microchip To Treat Vision Loss

...very small central circle, and all patients in the study are legally blind," says Pollack. The Artificial ...aperville, Illinois. "This is an expansion of the study of the first 10 patients completed in 2002," says study investigator Dr. Kirk Packo, who oversees th...

Chemists identify key gene in development of type 1 diabetes

...cial for the development of type 1 diabetes," says study leader Yousef Al-Abed, Ph.D., a chemist at the Ins...ng the MIF protein is already being explored. In a study presented last year at an ACS national meeting, the researchers reported they were able to prevent d...

Vascular structure and function improve with diet and exercise

...eek of a diet and exercise regimen, according to a study presented today at the American Heart Association'...nical risk factors for cardiovascular disease. The study reported preliminary data from the larger randomized Staged Nutrition and Activity Counseling (SNAC)...

Bone Density Recovers After Teens Stop Injected Contraceptive

...medroxyprogesterone acetate (DMPA), according to a study funded by the National Institute of Child Health a...one fracture or osteoporosis later in life. “This study shows that after adolescents stop using DMPA, their bone density can increase to levels comparable t...

Breast-Cancer Risk Linked to Exposure to Traffic Emissions at Menarche, First Birth

...ast cancer in women who are lifetime nonsmokers, a study by epidemiologists and geographers at the University at Buffalo has found. Their study was conducted among women who lived in Erie and Niagara counties of New York State between 1996 and ...

Towards precise classification of cancers based on robust gene functional expression profiles

...cial for the development of type 1 diabetes," says study leader Yousef Al-Abed, Ph.D., a chemist at the Ins...ng the MIF protein is already being explored. In a study presented last year at an ACS national meeting, the researchers reported they were able to prevent d...

Children's taste sensitivity and food choices influenced by taste gene

...esponding selections of AA children. According to study co-author, geneticist Danielle Reed, PhD, "The children most sensitive to PROP liked sweet more, but the reason for this relationship is not known. This difference could be due to taste receptor biology or it could be because those who are most bitte...

New Insights Into HIV Immunity Suggest Alternative Approach to Vaccines

...ibodies to prevent attacks against self. The Duke study suggests HIV vaccines may have failed in part beca...nes," said Barton Haynes, M.D., lead author of the study and director of the Human Vaccine Institute at Duke University Medical Center. The researchers will...

Ophthalmologists implant five patients with artificial silicon retina microchip

...very small central circle, and all patients in the study are legally blind," says Pollack. The Artificial ...aperville, Illinois. "This is an expansion of the study of the first 10 patients completed in 2002," says study investigator Dr. Kirk Packo, who oversees th...

Protein offers way to stop microscopic parasites in their tracks

... parasites known as apicomplexans. Results of the study will appear in the March 15 issue of Proceedings of the National Academy of Sciences. Scientists identified the new protein in the protozoan parasite Toxoplasma, which epidemiologists estimate infects 25 percent of all humans. The parasite rarely cau...

Asthma gene clusters identified

...to be unique to these children, according to a new study by researchers at Cincinnati Children's Hospital M...e Journal of Allergy and Clinical Immunology. The study is based on an Affymetrix "GeneChip" analysis of RNA isolated from the nasal epithelium of children ...

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