Manchester City trimmed Arsenal's lead at the top of the Premier League table to two points with a 3-0 win over Sunderland at the Etihad. The Gunners were beaten 2-1 by Aston Villa in the lunchtime ...

A reaction mechanism is a sequence of elementary reactions that can explain how an overall chemical reaction proceeds. Direct conversion of carboxylic acids to nitriles is desirable but ...

Reaction kinetics and dynamics refers to the study of why, how and how fast chemical processes take place. Chemists seek to understand the details of change at the molecular and quantum level and how ...

Food allergy symptoms can start quickly after eating and may last from minutes to a couple of days. Seasonal allergy symptoms can last for weeks or even months if exposure to the allergen continues.

An allergic reaction happens when the immune system overreacts to certain substances, causing symptoms like hives or difficulty breathing. Severe allergic reactions, called anaphylaxis, can be ...