CORVALLIS, Ore. – The growth of housing near national parks, national forests and wilderness areas within the United States may limit the conservation value that these protected areas were designed to create in the first place, a new study has found.
The researchers determined that housing development reduces the potential of these protected areas to serve as a modern-day "Noah's Ark," interrupting potential travel corridors for some animals, and altering habitat for others.
Jerusalem, December 21, 2009 –Evidence of sophisticated, human behavior has been discovered by Hebrew University of Jerusalem researchers as early as 750,000 years ago – some half a million years earlier than has previously been estimated by archaeologists.
Mice without the deoxycytidine kinase (dCK) enzyme have defects in their adaptive immune system, producing very low levels of both T and B lymphocytes, the major players involved in immune response, according to a study by researchers with UCLA's Jonsson Comprehensive Cancer Center.
Facing the increasing prevalence of type 2 diabetes worldwide in the past few decades, one may ask what is wrong with humans. Geneticists tell us that the human genome has not changed markedly in such a short time. Therefore, something must be happening in our environment or diet. As a matter of fact, dietary pattern is known to be closely linked to the development of type 2 diabetes. The increasing prevalence of type 2 diabetes following worldwide food fortification with niacin suggests that type 2 diabetes may involve excessive niacin intake.
Cancer may spread throughout the human body when malignant cells travel in the blood stream. But it may be possible to slow or even stop those cells from spreading by altering their structure, according to a recent investigation led by a Texas A&M University researcher.
NEW YORK – (December 21, 2009) A diminutive, colorful bird living in the rocky forests of Laos and Vietnam has been discovered by a team of scientists from the Wildlife Conservation Society, Lao PDR Department of Forestry, Swedish University of Agricultural Science, Swedish Museum of Natural History, BirdLife International and other groups.
In the field of hepatic imaging in the context of living liver donors and before complex partial liver resections, three-dimensional imaging of the liver, hepatic vessels and bile ducts has managed to become established in some centers. In this case, in addition to visualization, the volumetry of various liver sections is of interest. Moreover, the three-dimensional reconstruction can be used preoperatively to consider various resection options and to evaluate their technical feasibility with regard to vascular and bile duct anatomy and to the expected liver volume after surgery.
Fibrin sealant has been an extremely effective and widely used adjunct to surgical procedures to control diffuse slow bleeding over large surfaces. In addition, fibrin sealant has been used as a carrier for other compounds. Thus, it has been used to release medicines slowly at a fixed site and is therefore effective for a long time.
A study led by Jian-Zhu Fu from the Department of General Surgery, Beijing Tongren Hospital, Capital Medical University, has recently been published on December 14, 2009 in the World Journal of Gastroenterology.
Researchers have identified the protein mechanism that senses bicarbonate fluctuations and adjusts blood pH levels.. A Canadian/U.S. research team led by University of Alberta biological sciences professor, Greg Goss and his graduate students Martin Tresguerres and Scott Parks achieved the first demonstration of the process in a whole animal. The researchers found that the protein adenylyl cyclase sensed and then regulated the pH blood levels in a dogfish shark following feeding.
Mold and mildew may be doomed. Researchers are closer to understanding how these and other fungi grow. "Fungi have a big impact on our dinner plate," said Dr. Brian Shaw, Texas AgriLife Research plant pathologist. "We tend to think that getting food on the table is easy. But fungi are major disease-causing organisms for both plants and animals. With more research, we can find new ways to compete with them." Commonly known fungi are molds, mildews, mushrooms and yeast.
A simple amino acid that is repeated in the center of proteins found in tooth enamel makes teeth stronger and more resilient, according to new research at the University of Illinois at Chicago.
Researchers compared proline repeats in amphibian and animal models and discovered that when the repeats are short, such as in frogs, teeth will not have the enamel prisms that are responsible for the strength of human enamel. In contrast, when the proline repeats are long, they contract groups of molecules that help enamel crystals grow.
Stopping male mosquitoes from sealing their sperm inside females with a 'mating plug' could prevent mosquitoes from reproducing, and offer a potential new way to combat malaria, say scientists publishing new results in PLoS Biology on 22 December.
The new study focuses on the species of mosquito primarily responsible for the transmission of malaria in Africa, known as Anopheles gambiae. These mosquitoes mate only once in their lifetime, which means that disrupting the reproductive process offers a good way of dramatically reducing populations of them in Africa.
Antibodies directed against the protein CD20, which is expressed by immune cells known as B cells, are used to treat B cell non-Hodgkin lymphoma and rheumatoid arthritis. Despite this, the function of CD20 has not been determined. Now, a team of researchers led by René van Lier, at the Academic Medical Center, The Netherlands, has determined that CD20 has a nonredundant role in generating optimal B cell immune responses by analyzing a patient lacking the protein.
Individuals with single-gene mutations that mean they have abnormally low levels of the protein alpha-1 antitrypsin are highly susceptible to emphysema, a progressive lung disease that causes severe shortness of breath. Previous attempts to correct single-gene defects that cause lung disease by gene transfer have failed to achieve sustained gene expression in the mouse lung.
(Boston) – Researchers from Boston University School of Medicine (BUSM) have discovered a new gene therapy that may prevent the progression of emphysema. The study, which appears on-line in the Journal of Clinical Investigation, describes a method to express therapeutic genes in lung tissue for a lifetime after only a single treatment.