نتایج جستجو برای: purines

تعداد نتایج: 6599  

Journal: :journal of sciences islamic republic of iran 0

2,2'-disubstitutedamino-4-4'-bis-pyrimidines (3a-m) have been prepared by linking 2,4-dichloro-6-methyl-5-nitropyrimidine (1) with several diamines and subsequent reaction with suitable amines. some of these compounds (3c and 3j) which were reduced catalitically, on treatment with nitrous acid, urea in pyridine, and boiling thionyl chloride gave the corresponding bistriazolopyrimidin ...

Journal: :Revista de Matemática: Teoría y Aplicaciones 2023

We aim to fit 4-state sequences of DNA characters from three species a tripod tree, whose evolutionary model is Jukes-Cantor. For this purpose, we adapt the closest tree method used in 2-state coming four quartet, where states are purines and pyrimidines CFN. The adaptation requires multi stage methodology called ‘reduction process’. take frequencies character patterns on quartet as parameters ...

Journal: :The Journal of Chemical Physics 1963

Journal: :Computers, materials & continua 2021

Coronaviruses are responsible for various diseases ranging from the common cold to severe infections like Middle East syndromes and acute respiratory syndrome. However, a new coronavirus strain known as COVID-19 developed into pandemic resulting in an ongoing global public health crisis. Therefore, there is need understand genomic transformations that occur within this family of viruses order l...

Journal: :Acta Crystallographica Section D Structural Biology 2017

Journal: :Japanese Journal of Pharmacology 1984

Journal: :Agricultural and Biological Chemistry 1982

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