News tagged with density
Control of heart disease risk factors varies widely among outpatient practices, according to a study presented at the American Heart Association's Quality of Care and Outcomes Research Scientific Sessions 2013.
Health May 17, 2013 | not rated yet | 0
Scientists at the Texas Biomedical Research Institute in San Antonio have identified four genes in baboons that influence levels of "bad" cholesterol. This discovery could lead to the development of new drugs to reduce the ...
Medical research May 15, 2013 | 4.5 / 5 (2) | 0 |
A combination of two FDA-approved osteoporosis drugs with different mechanisms of action was found to increase bone density better than treatment with either drug alone in a small clinical trial. As reported in paper receiving ...
Diseases, Conditions, Syndromes May 14, 2013 | 5 / 5 (1) | 0 |
Androgen deprivation therapy is a common and effective treatment for advanced prostate cancer. However, among other side-effects, it can cause significant bone thinning in men on long-term treatment. A new study¹ by Vahakn ...
Cancer May 14, 2013 | not rated yet | 1
New research shows that growing up in areas where air pollution is increased raises the risk of insulin resistance (the prescursor to diabetes) in children. The research is published in Diabetologia, the journal of the Eu ...
Diabetes May 09, 2013 | not rated yet | 1
A heart-healthy diet helped men at high risk for heart disease reduce their bad cholesterol, regardless of whether they lost weight, in a study presented at the American Heart Association's Arteriosclerosis, Thrombosis and ...
Cardiology May 01, 2013 | 4 / 5 (1) | 0
Microwave imaging can be used to monitor how well treatment for breast cancer is working, finds new research published in BioMed Central's open access journal Breast Cancer Research. Microwave tomography was ab ...
Cancer Apr 23, 2013 | not rated yet | 0
Researchers at Karolinska Institutet have developed a method for assessing the effect of tamoxifen, a common drug to prevent the relapse of breast cancer. The key lies in monitoring changes in the proportion of dense tissue, ...
Cancer Apr 22, 2013 | not rated yet | 0
Researchers from Boston University School of Medicine (BUSM) have discovered that eating mushrooms containing Vitamin D2 can be as effective at increasing and maintaining vitamin D levels (25–hydroxyvitamin D) as taking ...
Health Apr 22, 2013 | 5 / 5 (3) | 1 |
2D plus 3D breast imaging increases cancer detection rates by 11%, and could be particularly useful in detecting cancer in women with dense breasts, a new study suggests.
Cancer Apr 19, 2013 | not rated yet | 0
Screening breast ultrasound performed after mammography on women with greater than 50% breast density detects an additional 3.4 cancers or high risk lesions per one thousand woman screened, a detection rate just under that ...
Cancer Apr 18, 2013 | not rated yet | 0
(HealthDay)—Abdominal computed tomography (CT) imaging, conducted for other indications, can be used to identify patients with osteoporosis, according to a study published in the April 16 issue of the Annals of ...
Cancer Apr 17, 2013 | not rated yet | 0
(HealthDay)—For women with degenerative spondylolisthesis (DS), polymorphisms in the estrogen receptor α (ERα) are associated with back pain intensity, according to a study published in the April issue ...
Diseases, Conditions, Syndromes Apr 11, 2013 | not rated yet | 1
Researchers at the University of Michigan have identified a new potential therapeutic target for lowering cholesterol that could be an alternative or complementary therapy to statins.
Cardiology Apr 10, 2013 | 5 / 5 (1) | 0 |
Researchers at Moffitt Cancer Center predict that advancements in breast cancer screening will need a personalized touch because mammography is not a "one strategy fits all" technology.
Cancer Apr 05, 2013 | not rated yet | 0
The mass density or density of a material is defined as its mass per unit volume. The symbol most often used for density is ρ (the Greek letter rho). In some cases (for instance, in the United States oil and gas industry), density is also defined as its weight per unit volume; although, this quantity is more properly called specific weight. Different materials usually have different densities, so density is an important concept regarding buoyancy, purity and packaging. Osmium and iridium are the densest known metal elements at standard conditions for temperature and pressure but not the densest materials.
Less dense fluids float on more dense fluids if they do not mix. This concept can be extended, with some care, to less dense solids floating on more dense fluids. If the average density (including any air below the waterline) of an object is less than water (1000 kg/m3) it will float in water and if it is more than water's it will sink in water.
In some cases density is expressed as the dimensionless quantities specific gravity (SG) or relative density (RD), in which case it is expressed in multiples of the density of some other standard material, usually water or air/gas. (For example, a specific gravity less than one means that the substance floats in water.)
The mass density of a material varies with temperature and pressure. (The variance is typically small for solids and liquids and much greater for gasses.) Increasing the pressure on an object decreases the volume of the object and therefore increase its density. Increasing the temperature of a substance (with some exceptions) decreases its density by increasing the volume of that substance. In most materials, heating the bottom of a fluid results in convection of the heat from bottom to top of the fluid due to the decrease of the density of the heated fluid. This causes it to rise relative to more dense unheated material.
The reciprocal of the density of a substance is called its specific volume, a representation commonly used in thermodynamics. Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass.
For more information about Density, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.