01427nas a2200229   4500008004100000022001400041245012300055210006900178260000900247300001600256490000600272520062400278653001300902653001800915653002700933653001900960653002300979100002001002700002101022700002401043856013001067       2021                        eng d  a2365-654900aReplacement of loop residues in TBA by an abasic ethylene glycol spacer: effect on stability, structure and function**0 aReplacement of loop residues in TBA by an abasic ethylene glycol  cOCT   a10648-106500 v63 aThis article describes the synthesis of ethyleneglycol (E) phosphoramidite and its incorporation into the thrombin binding aptamer (TBA) sequence at loop positions. Circular dichroism (CD) study revealed no major disturbances in the secondary structure of TBA by the abasic E unit and the derived oligomers exhibited a typical antiparallel chair-like conformation similar to that of TBA. UV and CD spectroscopy, together with anti-coagulation and HPLC studies revealed that although nuclease stability was enhanced, and anti-coagulation reasonably good, the thermal stability of the quadruplexes was adversely affected.10aaptamers10aclotting time10aethylene glycol spacer10aG-quadruplexes10anuclease stability1 aWagh, Atish, A.1 aGhalawat, Monika1 aFernandes, Moneesha  uhttps://library.ncl.res.in/content/replacement-loop-residues-tba-abasic-ethylene-glycol-spacer-effect-stability-structure-and01683nas a2200157   4500008004100000022001400041245012500055210006900180260000800249300001400257490000800271520107600279100002101355700001901376856013001395       2022                        eng d  a1932-744700aRemarkable effect of Fe and Se composition on magnetic properties-comparative study of the Fe-Se system at the nanoscale0 aRemarkable effect of Fe and Se composition on magnetic propertie  cMAR  a4655-46630 v1263 a<p>
	Herein, for the first time, the correlation between the phase structure and the magnetic properties of the Fe-Se system has been presented for FexSey compounds-where x/y ranges from 1:2 to 1:1. These phases-orthorhombic (FeSe2), monoclinic (Fe3Se4), hexagonal (Fe7Se8), and tetragonal (beta-FeSe)-were synthesized using a one-pot thermal decomposition route at the nanoscale. The magnetic properties vary enormously with change in the Fe/Se ratio due to the change in the Fe2+/Fe3+ ratio, crystal field environment around the Fe ions, magnetocrystalline anisotropy, Fe vacancies, and so forth. Among the four Fe-Se phases studied, two of them, Fe3Se4 and Fe7Se8, are ferrimagnetic below similar to 300 K and show semihard magnetic properties. The other two phases FeSe2 and beta-FeSe exhibiting weaker magnetism are less known for their magnetic properties. All these phases are prone to surface oxidation despite surface passivation, and its effect on the magnetic moment will be pronounced for the phases with weak magnetization such as FeSe2 and beta-FeSe.</p>
1 aGhalawat, Monika1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/remarkable-effect-fe-and-se-composition-magnetic-properties-comparative-study-fe-se-system