Type of amino acids obtained by hydrolysis of proteins is :

The ratio of the de-Broglie wavelengths of proton and electron having same Kinetic energy :

(Assume $m_{p}=m_{e} \times 1849$ )

If the shortest distance between the lines

$\overrightarrow r = \left( { - \widehat i + 3\widehat k} \right) + \lambda \left( {\widehat i - a\widehat j} \right)$

and $\overrightarrow r = \left( { - \widehat j + 2\widehat k} \right) + \mu \left( {\widehat i - \widehat j + \widehat k} \right)$ is $\sqrt {{2 \over 3}}$, then the integral value of a is equal to ___________.