نتایج جستجو برای: deuterated pyrimidines
تعداد نتایج: 9012 فیلتر نتایج به سال:
Biotransformation of deuterated-4'-O-methylnorbelladine into alkaloids galanthamine and lycorine in tissue cultures of Leucojum aestivum was demonstrated using HPLC coupled to mass spectrometry. GC-MS screening was also carried to investigate other native and deuterated alkaloids. A total of six labeled alkaloids were identified indicating that 4'-O-methyl-d(3)-norbelladine is incorporated into...
In vitro antimicrobial activity of seventeen heterocyclic nitrogen compounds {2-substituted pyrido [1,2-a] pyrimidin -4-oxo-1 [4]-3-Carbonitriles and ethyl 5-amino-3-(substituted) - pyrazole-3-Carboxylates} was tested against Escherichia coli, Bacillus subtilis and candida albicans strains, Antimicrobial activity was measured using standard two -fold serial dilution method and the minimum inhib...
Deuterated oxides exhibit prolonged hot carrier lifetimes at room temperature. We report evidence that this improved hot carrier hardness exists over the temperature range between -25 °C and 200 °C. However, the benefit of deuterium incorporation deceases with increasing stress temperature. Furthermore the VT -shift shows a remarkable absence of temperature dependence for the deuterated samples...
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