Terpenoid cyclases catalyze the most complex reactions in biology, in that more than half of the substrate carbon atoms often undergo changes in bonding during the course of a multistep cyclization ...

You may have muscle shaking or cramping, signs of temporary lactic acid build-up during intense exercise. Signs of lactic acidosis include nausea, vomiting, and shortness of breath. Staying hydrated ...

Citric acid naturally occurs in citrus fruits like lemons, limes, and oranges. Manufactured citric acid is produced from a type of mold called Aspergillus niger and is commonly used as a food additive ...

The pH is a negative logarithmic scale, which measures the molar concentration of hydrogen ions from 1 to 10 14 ions. It therefore has no unit of measurement. Numbers on a negative logarithmic scale ...

This story appears in the April 2011 issue of National Geographic magazine. Castello Aragonese is a tiny island that rises straight out of the Tyrrhenian Sea like a tower. Seventeen miles west of ...

Heartburn is a common symptom of acid reflux that may feel like a burning sensation in the throat and chest. Some people may experience heartburn and other symptoms of acid reflux after eating ...

Research suggests that apple cider vinegar may have beneficial health properties, including antimicrobial and antioxidant effects. Apple cider vinegar (ACV) is a popular home remedy. People have used ...

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