8.ALPHA.-Hydroxyflavinmononucleotide and related compounds.

8ƒ¿-hydroxyflavinmononucleotide and Related Compounds

2•L,3•L,4•L-Triacetyl-FMN has been transformed by selec tive radical bromination into 2•L,3•L,4•L-triacetyl-8ƒ¿-bromo-FMN, and the following hydrolysis of the latter has afforded 8ƒ¿-hydroxy-FMN. The presence of the hydroxy group in the 8ƒ¿ position of 8ƒ¿-hydroxy FMN is confirmed by its acetylation into 2•L,3•L-dracetyl-8ƒ¿-acetoxyribofla vin-4•L,5•L-cyclophosphate. The absorption spectra of t...

Coumarins, Xanthones and Related Compounds.

It has long been known that coumarins (α-pyrones) and xanthones (γ-pyrones) together form a large class of naturally occurring compounds exhibiting a wide range of biological activities. However, the interest of the scientific community for these secondary metabolites, as well as for their structural analogues, has never decreased since these “old compounds” are constantly generating promising—...

Pteroylglutamic acid and related compounds.

the evaluation of language related engagment and task related engagment with the purpose of investigating the effect of metatalk and task typology

abstract while task-based instruction is considered as the most effective way to learn a language in the related literature, it is oversimplified on various grounds. different variables may affect how students are engaged with not only the language but also with the task itself. the present study was conducted to investigate language and task related engagement on the basis of the task typolog...

Biomonitoring of 1,3-butadiene and related compounds.

The 1990 Clean Air Act Amendments list several volatile organic chemicals as hazardous air pollutants, including ethylene oxide, butadiene, styrene, and acrylonitrile. The toxicology of many of these compounds shares several common elements such as carcinogenicity in laboratory animals, genotoxicity of the epoxide intermediates, involvement of cytochrome P450 for metabolic activation (except et...