In this work, Ca-montmorillonite (STx), natural and modified (STx-L6) with a linear penta-ethylene-hexamine (L6), were tested as sorbents in liquid/solid process for La Cu capture bionic model solutions. Twelve La/Cu ratios solution set analyzed the final target of investigating mechanisms when both are present. The liquid phase was characterized via inductively coupled plasma-optical emission ...

C TJRRENT COLORIMETRIC METHODS for the measurement of formaldehyde in the presence of methenamine salts appear misleading. The principal problems with these technics include the release of formaldehyde (1, 2) from intact methenamine and the nonspecificity of the reaction producing color with other compounds present in urine. However, a modification of the method of Tannenbaum and Bricker (3) ap...

A hexamine macrobicycle with pyrrolyl spacers was evaluated as an anion receptor in its protonated forms. The protonation constants of the receptor, as well as its association constants with Cl(-), NO3(-), AcO(-), ClO4(-), H2PO4(-), and SO4(2-) were determined by potentiometry at 298.2 ± 0.1 K in H2O-MeOH (50 : 50 v/v) and at an ionic strength of 0.10 ± 0.01 M in KTsO. These studies revealed th...

Lead(II)-induced cleavage can be used as a tool to probe conformational changes in RNA. In this report, we have investigated the conformation of M1 RNA, the catalytic subunit of Escherichia coli RNase P, by studying the lead(II)-induced cleavage pattern in the presence of various divalent metal ions. Our data suggest that the overall conformation of M1 RNA is very similar in the presence of Mg(...

The development of natural-based adhesives is a key aspect in reducing the consumption fossil resources, adapting to legislation on use formaldehyde and ensuring sustainability wood panel industry. This study focuses five alternatives for tannin-based (tannin-paraformaldehyde, tannin-glyoxal, tannin-hexamine, tannin non-isocyanate polyurethane (NIPU) with ammonium hydroxide NIPU HDMA bio-adhesi...

Materials and Methods: Ruthenium hexamine chloride, Fullerene, C60, cetyltrimethylammonium bromide (CTAB), Tetraethoxysilane (TEOS, 98%), chloroform and toluene were obtained from Sigma and used as received. Ethanol (95–96%, Carlo Erba) and HCl (36%, Prolabo) were used for precursor hydrolysis and film deposition. TBAPF6 (Aldrich) was dried for 6 h in vacuum before use. Sodium nitrate was obtai...

Cyclohexene nucleic acids (CeNA), which are characterized by the presence of a cyclohexene moiety instead of a natural (deoxy)ribose sugar, are known to increase the thermal and enzymatic stability when incorporated in RNA oligonucleotides. As it has been demonstrated that even a single cyclohexenyl nucleoside, when incorporated in an oligonucleotide, can have a profound effect on the biologica...