Ammonia is one of the most abundant alkaline gases in the atmosphere. When released into the air, it reacts with acidic compounds to form fine particulate matter known as PM2.5, which contributes to air pollution, climate effects, and human health risks. Identifying where ammonia originates from is essential for designing effective emission control strategies. Researchers have long relied on nitrogen isotope signatures, commonly expressed as δ15N, to distinguish between ammonia released from sources such as fertilizers, livestock waste, and agricultural activities. However, uncertainties during sample collection have limited the precision of these measurements.

In a lab-grown cell study focused on potential new treatment targets for halting the spread of most pancreatic cancers, Johns Hopkins Medicine scientists report they have found that a gene called KLF5 (Krueppel-like factor 5) fuels the growth of such spreading tumors not by acquiring abnormal changes in the cancer cells’ DNA code itself but by altering chemical changes and organization of DNA, or epigenetics, that turns genes on and off

Although the public views the Covid-19, flu, and MMR vaccines as safe, an Annenberg survey shows a statistically significant erosion in support.

A study comparing one- and three-month antibiotic treatments to prevent active tuberculosis (TB) finds that a high percentage of patients successfully completed both regimens and suffered few adverse side effects. A team led by Richard Chaisson, of the Johns Hopkins School of Medicine, U.S.A., reports these findings February 10^th in the open access journal PLOS Medicine.

In mice, high-fat diets caused more health problems than a high-carbohydrate diet, which was not as healthy as the whole-grain based diet, according to a new study led by Penn State researchers.