Free Science Videos and Lectures

Human neutrophils are mobile cells that will quickly migrate to sites of injury to help fight infection. They are attracted there by chemical signals released by other cells of the immune system or...

This science video contains:
experiment, human, polarization, cell, bacteria, blood, neutrohpil chemataxis, microbes, chemical signal, micropipette

Neutrophils are our body's first line of defense against bacterial infections.

These cells can recognize certain chemicals and move to the source of these "chemoattractants" by migrating up the...

This science video contains:
cell, neutrophil chemotaxis, bacteria, bacterium, defense

We travel inside nucleus to see how the DNA replicates.

When DNA replicates its strands are separated by enzine helicase.
Single-stranded DNA binding proteines keep the strands from...

This science video contains:
dna, replication, enzine helicase, strand, polymerase, encode, okazaki fragments, rna primase, rna primer, dna ligase

Incredibly 80% of all the insects live in jungles. There can be more than 8 million individuals in a single hectare. But jungle ants don't have it all their own way. Bullet ants are showing some...

This science video contains:
cordyceps fungus, ants, infection, parasite, spores, colony, species, jungle

First the DNA Wrapping is animated.
The wrapping allows 6 feet of the long DNA molecule to be densely packed into the tiny nucleus of every cell. The process starts when DNA is wrapped around...

This science video contains:
molecules, dna, dna wrapping, dna replication, protein, histone, nucleus, nuclei zone, chromatin, chromosome, cell, double helix