The effectiveness of e-cigarettes as a smoking substitute will likely rely on whether they can consistently provide the amount of nicotine a smoker needs to resist the desire to return to traditional cigarettes.

A recent study that evaluated a new method for measuring nicotine delivery from e-cigarettes found that 'first-generation' e-cigarettes, which use 'cartomizers', deliver nicotine less consistently than later-generation e-cigarettes, which use 'atomizers' that vaporize liquid contained in a refillable tank.

The consistency of nicotine delivery from the atomizers was similar to nicotine inhalers and tobacco cigarettes and within the acceptable limits for medicinal nebulizers.

The cost of treating hepatitis C virus (HCV) could be cut up to 50 percent if mathematical models are used to predict when patients can safely stop taking direct-acting antiviral (DAA) medication, according to a new study by researchers at Loyola University Health System and Loyola University Chicago.

An estimated 170 million people have the blood-borne infection worldwide, which is a major cause of chronic liver disease. The recent approval of DAAs has led to a revolution in the treatment of HCV, but the high cost of DAAs limits access to treatment in America and abroad.

CABRIDGE, MA -- Liquid metal batteries, invented by MIT professor Donald Sadoway and his students a decade ago, are a promising candidate for making renewable energy more practical. The batteries, which can store large amounts of energy and thus even out the ups and downs of power production and power use, are in the process of being commercialized by a Cambridge-based startup company, Ambri.

Now, Sadoway and his team have found yet another set of chemical constituents that could make the technology even more practical and affordable, and open up a whole family of potential variations that could make use of local resources.

A dramatic increase in time spent on social media may be a sign of depression, according to a paper in Depression and Anxiety. And the more time young adults use social media, the more likely they are to be depressed, according to findings which could guide clinical and public health interventions to tackle depression, forecast to become a leading cause of psychological disability by 2030 - in high-income countries, anyway. Poor countries don't have the luxury of depression. 

The rosy periwinkle (Catharanthus roseus) is a plant that produces organic compounds used to treat cancer, arrhythmia, and other medical conditions and now the details of the metabolism process for these compounds on a cellular level has been reveaked. Their data suggests the existence of an unknown mechanism which regulates the creation, movement and distribution of compounds within plants. 

CORVALLIS, Ore. - Only 2.7 percent of the U.S. adult population achieves all four of some basic behavioral characteristics that researchers say would constitute a "healthy lifestyle" and help protect against cardiovascular disease, a recent study concluded.

In this study, researchers from Oregon State University and the University of Mississippi examined how many adults succeed in four general barometers that could help define healthy behavior: a good diet, moderate exercise, a recommended body fat percentage and being a non-smoker. It's the basic health advice, in other words, that doctors often give to millions of patients all over the world.