Thought to be the most addictive form of nicotine in tobacco smoke, free-base nicotine is found at a wide range of levels in popular brands

When it comes to nicotine content, all cigarettes are not created equal, according to a new study by researchers at Oregon Health & Science University. In fact, the study finds that some commercial cigarette brands contain 10 to 20 times higher percentages of nicotine in the so-called “free-base” form — the form thought to be most addictive — t

Researchers have discovered a novel class of compounds that affects the cell’s garbage disposal system which degrades proteins and opens a window for understanding a vital cell function as well as for treating heart disease and cancer.

The distinctive mechanisms of these compounds are reported in the July 29 issue of Biochemistry and online earlier this month by Dr. Michael Simons, professor of medicine and of pharmacology and toxicology at Dartmouth Medical School and head of ca

A team of scientists, including several from the National Center for Atmospheric Research (NCAR), has determined that human-related emissions are largely responsible for an increase in the height of the tropopause – the boundary between the two lowest layers of the atmosphere. The research results, which will be published July 25 in the journal Science, provide additional evidence that emissions from power plants, automobiles, and other human-related (or anthropogenic) sources are having profound im

Scientists from the Lawrence Livermore National Laboratory have determined that human-induced changes in ozone and well-mixed greenhouse gases are the primary drivers of recent changes in the height of the tropopause.

Earlier research has shown that increases in the height of the tropopause over the past two decades are directly linked to stratospheric ozone depletion and increased greenhouse gases.

The new research uses climate model results to provide more quantitative est

Older adults with anemia are twice as likely to have a significant decline in physical performance that could threaten their independence, report researchers from Wake Forest University Baptist Medical Center in the current issue of the American Journal of Medicine.

“Our results suggest that anemia is an independent risk factor for physical decline, which puts older adults at higher risk for nursing home admission, disability and death,” said Brenda Penninx, Ph.D., associate professor

In an article appearing in a special issue of the Journal of Neuro-oncology, researchers at Cedars-Sinai Medical Center’s Maxine Dunitz Neurosurgical Institute describe a complex cell-level process that allows malignant brain tumors to protect themselves by damaging the thymus, rapidly degrading the immune system. In a second article, Institute scientists identify a molecular mechanism that causes cell death of cancer-fighting lymphocytes as they infiltrate a brain tumor.

“We are