New research on prehistoric stone tools in Colombia's tropics has found no correlation between tool shape and function. The study concluded that prehistoric people used their simple tools for various purposes, including hunting, butchering, and working wood, regardless of the tool's shape.
A Purdue University researcher has discovered a gene in fruit flies that plays a key role in regulating the flow of calcium into cells. Mutations in this gene suppress the effects of degeneration caused by overactive calcium channels, potentially leading to new treatments for diseases like Alzheimer's.
Researchers found that patients with more extreme daily mood swings experienced greater improvements in therapy outcomes, regardless of treatment type. This suggests that increasing patient sensitivity to stimuli may be a more effective approach than finding the best therapy for each individual.
Researchers are refining technologies to identify active genes in the central nervous system, accelerating understanding of diseases like Alzheimer's, depression, and schizophrenia. Two teams use distinct approaches: one detects proteins or RNA in intact neurons, while the other identifies genes involved in daily rhythms.
A study by University of Pittsburgh researcher Akira Sekikawa found a wide range of death rates across the US, with southern states having the highest CHD mortality rates. The researchers attributed these differences to variations in cigarette smoking and high school graduation rates among men aged 35-44.
Researchers found that exercise increases the growth of new nerve cells and improves long-term memory in adult mice. Mice exercising for one month showed a significant improvement in memory skills, with better recall times and increased neural activity compared to sedentary mice.
A recent study found that leisure physical activity buffers the effects of minor stress, but aerobic fitness does not. This suggests that exercise may help minimize stress-related symptoms by distracting from stressors or instilling a sense of accomplishment.
A new University of Michigan study found that nerve tests for carpal tunnel syndrome are not reliable and can produce different results depending on who performs the test. The study suggests using a continuous scale to evaluate test results rather than absolute cutoff points.
Researchers found that middle-aged women can avoid weight gain through increased physical activity and a low-fat, reduced-calorie dietary pattern. The five-year study showed significant reductions in weight gain and waist circumference among those who participated in the lifestyle intervention program.
The Climate Impacts Group at the University of Washington predicts significant climate changes in the NW region by 2050, including warmer temperatures, wetter winters, and shrinking snowpack. The report highlights the need for regional water management and planning to mitigate these impacts.
Researchers discovered that humans carry a snippet of DNA resembling an HIV gene sequence, known as HERV-K, which has been present in the human genome for over 30 million years. The virus's Rev protein, similar to HIV's, helps with viral replication and may have implications for xenografts and viral infection strategies.
Researchers conducted an extensive review of recent studies on chronic fatigue syndrome (CFS), noting a lack of consensus on its definition and treatment. Studies estimate that up to 380 out of every 100,000 people in the US suffer from CFS, primarily affecting middle-aged women.
Researchers found that individuals with current or past alcohol problems were less likely to quit smoking after participating in a cessation program. Those with past alcohol issues also smoked more cigarettes per day and had difficulty quitting compared to those without alcohol problems.
Researchers at Johns Hopkins Medicine have identified a new neurotransmitter, D-serine, which activates key nerve cells in the brain. This discovery could lead to the development of new stroke treatments by inhibiting NMDA receptor activity.
Researchers at UCSF have identified a new chemical pathway in the brain involved in regulating mood, which may improve treatment for depression. The study found that popular antidepressants like Prozac and Zoloft increase the synthesis of a key neurosteroid, potentially providing a new target for mood-regulating drugs.
A cholesterol-lowering drug, pravastatin, has been shown to reduce stroke risk by 20% in patients with heart disease or high cholesterol. The study pooled data from three clinical trials involving over 19,700 participants and found a significant reduction in stroke rate, particularly among those with coronary heart disease.
Researchers have found that memory uses separate pathways for various types of information, including visual and sensory inputs. This is achieved through the hippocampal memory system, which receives signals from different areas of the brain.
The Chandra X-ray Observatory has been selected as one of the top 100 'Best of What's New' items by Popular Science magazine, highlighting its significant contributions to X-ray astronomy. The observatory is already sending back impressive images that are aiding in understanding exploding stars, black holes, and other celestial phenomena.
The NTP Center for the Evaluation of Risks to Human Reproduction will convene an Expert Panel to review seven phthalate esters. The meeting aims to complete integrated evaluation documents and draft summary statements on the chemicals' developmental and reproductive toxicity.
A new scoring system used in treadmill testing has been found to improve the accuracy of diagnosing heart disease, with 77% accuracy overall compared to 69% for expert cardiologists. This method is more accurate than expensive diagnostic equipment and can provide a second opinion for physicians.
African-American adolescent boys who received emotional support during conflict situations had higher blood pressure reactivity than those with problem-solving or no support. Emotional support may be perceived as negative by these adolescents, leading to increased cardiovascular reactivity.
A new study reveals that social network characteristics and healthcare provider recommendations significantly influence women's breast cancer screening practices. The research found that women who perceive regular mammography as common among their peers are more likely to get screened regularly.
A new study found that heart disease begins to develop in childhood, with well-developed plaque deposits present in one in six teenagers. The study used ultrasound to examine the arteries of recently-transplanted hearts from people who were free of known heart disease.
A new study by UCSF researchers found that participants in a therapeutic community-based treatment program made positive changes in drug injection use and high-risk sex. The longer the time spent in treatment, the less likelihood of engaging in high-risk behaviors such as needle sharing.
A study of 292 breast cancer survivors found that involvement in decision-making about follow-up tests improved physical and emotional health, but did not affect post-cancer survival rates. Leading cancer experts recommend mammography and clinical breast exams instead.
A study by Hennepin County Medical Center found that cocaine users are at a higher risk of developing aneurysms in their heart arteries, with 30% of participants showing the condition. The study suggests that cocaine use causes blood vessel damage and accelerates atherosclerosis, leading to increased cardiovascular health problems.
A study by American Academy of Neurology finds that 'chasing the dragon' heroin use can produce a progressive brain disorder leading to permanent damage and death. Antioxidant therapy shows promise in treating the condition, but its effectiveness is uncertain.
A recent study of 4,462 male U.S. Army veterans with post-traumatic stress disorder (PTSD) found a higher rate of heart disorders, including past heart attacks, compared to other veteran subjects. The study's results suggest that long-term severe psychological distress may cause coronary heart disease.