The time of sedimentation (in seconds) for a spherical particle is (Please see the picture below)
where t is the sedimentation time, is the viscosity of medium, R hydro is the
hydrodynamic radius of the particle, r b is the radial distance from the centre of rotation
to bottom of tube, r t is the radial distance from the centre of rotation to liquid meniscus,
ρ is the density of the particle, m is the density of the medium and is the angular velocity
of the rotor.

TLS Online TPP Program

#Id: 7518

#Unit 6. System Physiology – Plant

Auxin influx 

Auxin can enter plant cells from any direction by either of two mechanisms:

Passive diffusion of the protonated (IAAH) form across the phospholipid bilayer

Secondary active transport of the dissociated (IAA–) form via a 2H+–IAA– symporter

The dual pathway of auxin uptake arises because the passive permeability of the membrane to auxin depends strongly on the apoplastic pH.

TLS Online TPP Program

#Id: 2765

#Unit 13. Methods in Biology

Several methods are available, but three are very popular: DNase, dimethylsulfate (DMS), and hydroxyl radical footprinting. 

TLS Online TPP Program

#Id: 5904

#Unit 3. Fundamental Processes

A new model for the structure of the DNA Pol III complex proposes a three-polymerase core structure, with two Pol III catalytic cores responsible for synthesis of the lagging strand and one for the leading strand.

TLS Online TPP Program

#Id: 7263

#Unit 6. System Physiology – Plant

Form I is found in most autotrophic organisms. Contributing up to 50% of soluble leaf protein, it is the predominant protein in plant leaves.

TLS Online TPP Program

#Id: 5705

#Unit 7. System Physiology – Animal

The ACTH family is derived from a single precursor,

pro-opiomelanocortin (POMC)