these are formed between two cysteine amino acids, located on neighboring polypeptide chains.
What is a disulfide bond
100
salt bonds are relatively weak physical side bonds that are the result of this
What is an attraction between opposite electrical charges.
100
hydrogen bonds are relatively weak physical side bonds that are easily broken by water or heat as in this.
What is wet setting or themal styling
200
These alkaline solutions soften and swell the hair, raising the cuticle and thereby permitting the solution to penetrate through the cuticle.
What is chemical hair texturizing
200
The peptide bonds, in turn, link together to form long chains of amino acids.
What are polypeptide chains
200
disulfide bonds join these on one polypeptide chain with a second one on a neighboring polypeptide chain to form cystine.
What are cysteine sulfur atoms
200
salt bonds are easily broken by this
What is changes in the pH
200
A wet set is a result of this that results from breaking and reforming the hydrogen bonds within the hair.
What is a physical change
300
This hair type has a strong cuticle layer requiring a texturizer that is highly alkaline.
What is coarse, resistant hair
300
These are long, coiled, complex polypeptide chains made of many different amino acids linked together, end-to-end, like pop beads
What are proteins
300
disulfide bonds are weaker than these bonds, but are much stronger than hydrogen or salt bonds
What is peptide
300
salt bonds are re-formed when this happens
What is pH returning to normal
300
wetting the hair breaks the hydrogen bonds and permits the hair to be stretched and wrapped on rollers while drying the hair removes the water and re-forms this in their new temporary shape
What are hydrogen bonds
400
This layer is located directly beneath the cuticle layer.
What is the cortex
400
these should not be broken during any salon service due to the fact that it causes the polypeptide chains to come apart and dramatically weakens the hair.
What are peptide bonds
400
disulfide bonds are strong chemical side bonds that are not broken by this.
What is heat or water
400
Salt bonds are far weaker than these bonds
What is disulfide
400
thermal styling with hair dryers, curling irons, and pressing combs breaks the hydrogen bonds, which is a physical change with temporary results. The hair returns to its original shape when this happens
What is appling water or moisture
500
These chains of the cortex are connected by end bonds and cross-linked by side bonds that form the fibers and structure of the hair.
What is polypeptide chains
500
If using this incorrectly, these can break peptide bonds and cause hair breakage.
What is chemical hair texturizers
500
disulfide bonds are the strongest of hte three side bonds and account for this amount of the hairs overall strength
What is one-third
500
salt bonds account for this percentage of overall hair strength
What is one-third
500
hydrogen bonds account for one-third of the overall strength even though they are the weaker of the side bonds because of this