In a “normal” electrocardiogram (ECG), the transition of the QRS axis in the precordial leads occurs between leads V 3 and V 4 (i.e., there is a dominant S in V 3 and a dominant R in V 4).

Researchers have unseated a previous theory for the mechanism underlying bacterial flagella movement, changing our ...

Scientific research utilizes animals to better understand specific illnesses and therapeutics and their physical and psychological impacts. Scientists commonly use rodents because of their biological ...

About half of all spiral galaxies appear to be rotating clockwise and the other half counterclockwise. The direction a galaxy rotates depends on your perspective. As an analogy, consider a spinning ...

Scientists have uncovered a new explanation for how swimming bacteria change direction, providing fresh insight into one of biology's most intensively studied molecular machines.