Upon centrifugation, particles sediment at different rates due to their physical properties. Tropomyosin is a rod-shaped protein
with a mass of 70 kDa and a sedimentation coefficient of 2.6S. Hemoglobin is a spherical protein with a slightly smaller mass of 65 kDa, but a much higher sedimentation coefficient of 4.31S. Which property of tropomyosin accounts for its slow sedimentation?
Centrifugation separates molecules on the basis of angular motion.
Due to spherical shape, the value of 'f' is lesser for a spherical protien than the rod shaped one.
Hence the sedimentation coefficient for an elongated protien is 2.6S while htat of a spherical protien is 4.31S.
Hence its elongated shape results in slow centrifugation.
Some of the important principles of centrifugation are as follows :
The greater the mass, the more is the sedimentation rate i-e the one with greater mass will move down more rapidly as compared to the one with les mass.
Shape of particles also effect it, the rounder the particle, the lower frictional coeeficient.
The expected growth mark marker for a 6 month old infant is that the infant can transfer objects from hand to hand, rolls from prone to supine, sits well unsupported, presents with stranger anxiety, and that the patient can babble.
Xylem carries water and minerals from the roots to the leaves. Whereas, phloem carries the food prepared by the leaves to different parts of the plant.
