An equation for the neutron capture reaction and for the reaction in which the product of this reaction decays by beta-emission has to be written. Concept introduction: Balancing nuclear reaction equation: The balanced nuclear reaction should conserve both mass number and atomic number. The sum of the mass numbers of the reactants should be equal to the sum of mass numbers of the products in the reaction. The sum of atomic numbers (or the atomic charge) of the reactants should be equal to the sum of atomic numbers (or the atomic charge) of the products in the reaction.

Question

The molar absorptivity of a protein in water at 280 nm can be estimated within ~5-10% from its content of the amino acids tyrosine and tryptophan and from the number of disulfide linkages (R-S-S-R) between cysteine residues: Ε280 nm (M-1 cm-1) ≈ 5500 nTrp + 1490 nTyr + 125 nS-S where nTrp is the number of tryptophans, nTyr is the number of tyrosines, and nS-S is the number of disulfide linkages. The protein human serum transferrin has 678 amino acids including 8 tryptophans, 26 tyrosines, and 19 disulfide linkages. The molecular mass of the most dominant for is 79550. Predict the molar absorptivity of transferrin. Predict the absorbance of a solution that’s 1.000 g/L transferrin in a 1.000-cm-pathlength cuvet. Estimate the g/L of a transferrin solution with an absorbance of 1.50 at 280 nm.

Answer 1

Question

Chapter 25, Problem 68IL

(a)

Interpretation Introduction

Interpretation:

An equation for the neutron capture reaction and for the reaction in which the product of this reaction decays by beta-emission has to be written.

Concept introduction:

Balancing nuclear reaction equation: The balanced nuclear reaction should conserve both mass number and atomic number.

The sum of the mass numbers of the reactants should be equal to the sum of mass numbers of the products in the reaction.

The sum of atomic numbers (or the atomic charge) of the reactants should be equal to the sum of atomic numbers (or the atomic charge) of the products in the reaction.

(b)

Interpretation Introduction

Interpretation:

Half-life of Sodium-23 has to be determined.

Concept introduction:

Concept Introduction:

Radiocarbon dating: The dynamic equilibrium exists in all living organism by exhaling or inhaling, maintain the same ratio of 12C and 14C that takes in. when the living organism dies, the intake of 14C stops and it’s the ratio no longer exhibits equilibrium; undergoes radioactive decay.

Half-life period: The time required to reduce to half of its initial value.

Formula used to calculate half-life:

t1/2= 0.693kwhere, k is rate constant. (or)ln[N]t- ln[N]0= -kt

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