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bragg's law solid structure crystallography spectroscopy detectors in x ray production of x ray types of x ray diffraction patterns application of x ray instrumentation of x ray diffraction pattern in x ray x ray chemistry of pgs and lts biosynthesis of prostaglandins and leukotrienes function of pgs cox autocoids chemistry leukotrienes prostaglandins hydrogen bonding covalent forces ionic forces van der waal forces binding forces drug receptor interactions oswald theory macromolecular perturbation theory occupancy theory rate theory theories of drug receptor interaction receptors vitamin a retinol menthol citral carotenoids triterpenoids diterpenoids monoterpenoids structural elucidation terpenoids