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G.N. RAMACHANDRAN received a Ph.D. from ...

G.N. RAMACHANDRAN received a Ph.D. from Cambridge University in 1949, while at Cambridge, he met —— and was deeply influenced by his publications on models of the `alpha`-helix and `beta`-sheet structures that directed his attention to solving the structure of collagen. -

A

Von Behring

B

Huxley

C

Linus Pauling

D

Louis Pasteur

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To solve the question, we need to identify the person whom G.N. Ramachandran met while at Cambridge University that influenced his work on the structure of collagen. 1. **Identify G.N. Ramachandran's Background**: G.N. Ramachandran received his Ph.D. from Cambridge University in 1949. He is a prominent figure in the field of biochemistry and structural biology, known for his work on protein structures. 2. **Recognize the Influence**: The question states that while at Cambridge, Ramachandran was influenced by someone’s publications on models of the alpha-helix and beta-sheet structures. These structures are fundamental components of protein secondary structure. 3. **Identify the Key Figure**: The person who is widely recognized for his work on the alpha-helix and beta-sheet structures is Linus Pauling. Pauling's contributions to the understanding of protein structures were significant and had a profound impact on many scientists, including Ramachandran. 4. **Connect to Collagen Structure**: Ramachandran's attention was directed towards solving the structure of collagen, which is a protein that has a unique triple-helical structure. His work in this area was influenced by the foundational knowledge he gained from Pauling's research. 5. **Conclude the Answer**: Therefore, the answer to the question is that while at Cambridge, G.N. Ramachandran met **Linus Pauling**. Final Answer: Linus Pauling ---
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Niels Bohr a Danish physicist received his PhD from the University of Copenhagen in 1911. He that spent a year with J.J. Thomson and Ernest Rutherford in England. In 1913, he returned to Copenhagen Where he remained for the rest of his life. In 1920 he was named Director of the Institute of theory! Physics After first World War Bohr worked energetically for peaceful uses of atomic energy recieved the first Atoms for Peace award in 1957 Bohr was awarded the Nobel Prize in Physics 1922 (a) The Angular momentum of an electron in a given stationary state can be expressed as m_e vr =h/(2pi) where n=1, 2,3 ...... Thus an electron can move only in those orbits for which its angular momentum is integral multiple of h/2 pi that is why only certain fixed orbits are alowed (b) The radii of the stationary states are expressed as r_n=n^2a_0 where a_0 =52.9 pm. Thus the radius the first stationary state, called the Bohr radius, is 52.9 pm. Normally the electron in the hydrogen atom is found in this orbit (that is n =1). As n increases the value of r will increase (c) The most important property associated with the electron E_n=-2.18xx10^(-18)(Z^2/n^2)J n=1,2,3 (d)it is also possible to calculate to calculate the velocities of electrons moving in these orbits by using v_n=2.18 10^6xxZ/n m/sec. Qualitatively the magnitude of velocity of electron increases with increase of positive charge on the nucleus and decreases with increases the value of n. (e)Bohr's theory can also be applied to th ions containing only one electron, similar to that present it hydrogen atom. For example , He^+ Li^(2+) , Be^(3+) and so on. given by the expression Ex=-218x n=1,2,3 (d) It is also possible to calculate the velocities of electrons moving in these orbits by using V 2.1810 cm/sec Qualitatively the magnitude of velocity of electron increases with increase of positive charge on the nucleus and decreases with increase the value of n (e) Bohr's theory can also be applied to the ions containing only one electron, similar to that presenti hydrogen atom For example, Help, Be and so on Choose the incorrect curve : if v=velocity of electron in Bohr's orbit r=Radius of electron in Bohr's orbit P.E.=Potential energy of electron in Bohr's orbit K.E.=Kinetic energy of the electron in Bohr's orbit.