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TLS Online TPP Program

#Id: 6870

Rap1 recruits Sir4 on acetylated histones, then recruits both its binding partner Sir3 and the HDAC Sir2. 
Sir3 and Sir4 then interact directly with histones H3 and H4. Once Sir3 and Sir4 have bound to histones H3 and H4, 
Sir2 deacetylates histones
Sir2-dependent deacetylation represses transcription.


#Unit 3. Fundamental Processes #Chromatin Remodelling & Epigenetics #Part B Pointers
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TLS Online TPP Program

#Id: 7740

#Unit 1. Structure and Function of Biomolecules

Atomic radii: The atomic radii of an atom depends on its position in the periodic table.
We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.
All that we can measure is the distance between two nuclei (internuclear distance).
TLS Online TPP Program

#Id: 7741

#Unit 1. Structure and Function of Biomolecules

Atomic radii: The atomic radii of an atom depends on its position in the periodic table.
We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.
All that we can measure is the distance between two nuclei (internuclear distance).
TLS Online TPP Program

#Id: 7742

#Unit 1. Structure and Function of Biomolecules

Atomic radii: The atomic radii of an atom depends on its position in the periodic table.
We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.
All that we can measure is the distance between two nuclei (internuclear distance).
TLS Online TPP Program

#Id: 7743

#Unit 1. Structure and Function of Biomolecules

A covalent radius is one-half the distance between the nuclei of two identical atoms.
TLS Online TPP Program

#Id: 7744

#Unit 1. Structure and Function of Biomolecules

An ionic radius is one-half the distance between the nuclei of two ions in an ionic bond.
TLS Online TPP Program

#Id: 7745

#Unit 1. Structure and Function of Biomolecules

The noble gases are left out of the trends in atomic radii because there is great debate over the experimental values of their atomic radii.

The SI units for measuring atomic radii are the nanometer (nm) and the picometer (pm). 1 nm = 1 X 109 m; 1 pm = 1 X 10-12 m.