نتایج جستجو برای: major cation
تعداد نتایج: 671751 فیلتر نتایج به سال:
Here we demonstrate that monovalent cations can localize around B-DNA in geometrically regular, sequence-specific sites in oligonucleotide crystals. Positions of monovalent ions were determined from high-resolution X-ray diffraction of DNA crystals grown in the presence of thallium(I) cations (Tl(+)). Tl(+) has previously been shown to be a useful K(+) mimic. Tl(+) positions determined by refin...
The incorporation of 7-deazaguanine modifications into DNA is frequently used to probe protein recognition of H-bonding information in the major groove of DNA. While it is generally assumed that 7-deazaguanine forms a normal Watson-Crick base pair with cytosine, detailed thermodynamic and structural analyses of this modification have not been reported. The replacement of the 7-N atom on guanine...
All forest fi re events generate some quantity of charcoal, which may persist in soils for hundreds to thousands of years. However, few studies have eff ectively evaluated the potential for charcoal to infl uence specifi c microbial communities or processes. To our knowledge, no studies have specifi cally addressed the eff ect of charcoal on ammonia-oxidizing bacteria (AOB) in forest soils. Con...
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