SciTech Revel

CAN YOU BECOME IMMORTAL? Could someone transfer their consciousness to another body in order to live forever? That's the basis behind new film Selfless, but just how scientifically plausible is it? As the latest episode of AsapSCIENCE explains, we're actually closer than you might think.

What are Pheromones? Pheromones are most commonly thought of as scents that animals give off that will lure a potential mate to them, or scare a potential threat away. Humans also seem to produce these scents naturally. The detection of pheromones, however, is where the problem lies. Scientists have had difficulty finding an area of the brain that detects the pheromones secreted by others. This may be the explanation for why human pheromones are believed to not exist or cause a reaction for humans. A study from the Huddinge University Hospital in Sweden sheds some light on the truth of this conundrum. In the experiment, Ivanka Savic found that smelling synthetic versions of either testosterone or estrogen led to an increase in blood flow to the hypothalamus. The men showed an increase when smelling estrogen and women when smelling testosterone, but neither had a reaction when smelling the scent of the same gender. The hypothalamus is the region of the brain in rodents and other a...

Cholesterol and Heart Disease Cholesterol is probably the best-known steroid because of the widely publicized correlation between cholesterol levels in the blood and heart disease. Cholesterol is synthesized in the liver and is present in almost all body tissues. It is also found in many foods, but we do not require cholesterol in our diet because the body can synthesize all we need. A diet high in cholesterol can lead to high levels of cholesterol in the bloodstream, and the excess can accumulate on the walls of arteries, restricting the flow of blood. This disease of the circulatory system is known as atherosclerosis and is a primary cause of heart disease. Cholesterol travels through the bloodstream packaged in particles that are classified according to their density. Low-density lipoprotein (LDL) particles transport cholesterol from the liver to other tissues. Receptors on the surfaces of cells bind LDL particles, allowing them to be brought into the cell so it can use...

Drugs Bind to Their Receptors Many drugs exert their physiological effects by binding to specific sites, called receptors , on the surface of certain cells  . A drug binds to a receptor using the same kinds of bonding interactions—van der Waals interactions, dipole–dipole interactions, hydrogen bonding—that molecules use to bind to each other. The most important factor in the interaction between a drug and its receptor is a snug fit. Therefore, drugs with similar shapes and properties, which causes them to bind to the same receptor, have similar physiological effects. For example, each of the compounds shown here has a nonpolar, planar, six-membered ring and substituents with similar polarities. They all have anti-inflammatory activity and are known as NSAIDs (non-steroidal anti-inflammatory agents). Salicylic acid has been used for the relief of fever and arthritic pain since 500 b.c. In 1897, acetylsalicylic acid (known by brand names such as Bayer Aspirin, Bufferin,...

In the future, an AI may diagnose eye problems The computer will see you now. Artificial intelligence algorithms may soon bring the diagnostic know-how of an eye doctor to primary care offices and walk-in clinics, speeding up the detection of health problems and the start of treatment, especially in areas where specialized doctors are scarce. The first such program — trained to spot symptoms of diabetes-related vision loss in eye images — is pending approval by the U.S. Food and Drug Administration. While other already approved AI programs help doctors examine medical images, there’s “not a specialist looking over the shoulder of [this] algorithm,” says Michael Abràmoff, who founded and heads a company that developed the system under FDA review, dubbed IDx-DR. “It makes the clinical decision on its own.” IDx-DR and similar AI programs, which are learning to predict everything from age-related sight loss to heart problems just by looking at eye images, don’t follow preprogramm...

The debate over how long our brains keep making new nerve cells heats up Adult mice and other rodents sprout new nerve cells in memory-related parts of their brains. People, not so much. That’s the surprising conclusion of a series of experiments on human brains of various ages  first described at a meeting  in November . A  more complete description  of the finding, published online March 7 in  Nature , gives heft to the controversial result, as well as ammo to researchers looking for reasons to be skeptical of the findings. In contrast to earlier prominent studies, Shawn Sorrells of the University of California, San Francisco and his colleagues failed to find newborn nerve cells in the memory-related hippocampi of adult brains. The team looked for these cells in nonliving brain samples in two ways: molecular markers that tag dividing cells and young nerve cells, and telltale shapes of newborn cells. Using these metrics, the researchers saw signs of n...

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