- published: 13 Sep 2012
- views: 95963
Casein (/ˈkeɪs.ɪn/ or /ˈkeɪˌsiːn/, from Latin caseus, "cheese") is the name for a family of related phosphoproteins (αS1, αS2, β, κ). These proteins are commonly found in mammalian milk, making up 80% of the proteins in cow milk and between 20% and 45% of the proteins in human milk. Casein has a wide variety of uses, from being a major component of cheese, to use as a food additive, to a binder for safety matches. As a food source, casein supplies amino acids, carbohydrates, and the two inorganic elements calcium and phosphorus.
Casein contains a fairly high number of proline residues, which do not interact. There are also no disulfide bridges. As a result, it has relatively little tertiary structure. It is relatively hydrophobic, making it poorly soluble in water. It is found in milk as a suspension of particles called "casein micelles" which show only limited resemblance with surfactant-type micellae in a sense that the hydrophilic parts reside at the surface and they are spherical. However, in sharp contrast to surfactant micelles, the interior of a casein micelle is highly hydrated. The caseins in the micelles are held together by calcium ions and hydrophobic interactions. Any of several molecular models could account for the special conformation of casein in the micelles. One of them proposes the micellar nucleus is formed by several submicelles, the periphery consisting of microvellosities of κ-casein. Another model suggests the nucleus is formed by casein-interlinked fibrils. Finally, the most recent model proposes a double link among the caseins for gelling to take place. All three models consider micelles as colloidal particles formed by casein aggregates wrapped up in soluble κ-casein molecules.
The boat that failed it's only sail
is burning in the river
It's heating up the water mains
while the rest of the house just shivers
It's sinking fast
straight through the grass
A buoyant mask
A medical grasp
and that... was
all I had to give her
...but I will take my hand's mistakes
Stay afloat in
this flushing river
With the smell of your soul
and fix the bridge that
bowed
from the blows that age delivers
But I fear collapse...
as your
weight will pass
You know... I love you more that you will know
Something
is coming for us
t's coming through the vents
.for the worst and
best.
And so it seems
Like old beliefs...
We're struggling in the
water
Fishing for a fish that knows
of a way to save the other...
Don't turn
blue
It's turning the room...
and as it spins the violence
coats the walls
in bother...
Carousels and comet tails
are somewhere in this river
...and