choline oxidase (chox) was chosen as a model enzyme for evaluating the performance of cnts’ functional groups for development of enzyme electrodes. cnts were functionalized with carboxylic acid, amine or amide groups. carboxylic acid, amine and amide functionalized cnts were obtained by acid treatment, ethylenediamine or tetraethylenepentamine chemically modification and ammonia plasma treatmen...

The thiosemicarbazone of 9-anthraldehyde, (9-ATSC) and its group 12 metal complexes have been synthesized. The compounds have been characterized by IR, electronic and NMR spectrometries, molar conductivity, melting points and elemental analysis. In all the complexes, the 9-ATSC coordinates through the sulfur and the azomethinic nitrogen. The zinc (II) complex shows a 1:2 metal to ligand stoichi...

The reaction of furylacrylic acid with cyclopentadiene in toluene gave the expected Diels-Alder endo-and exo-adductsin -1 : 1 ratio. The adducts were separated by iodolactonization method to provide 3-endo-(2'-furyl) bicyclo 12.2.11 hept-5-ene- 2-exo-carboxylic acid and 3-exo-(2'-fury1)bicyclo 12.2.11 hept-5-ene-2-endocarboxylic acid. Esterification of these acids by MeI / HMPA gave the exp...

This work determined the impact of irrigation on the seasonal dynamics of populations of Pseudomonas spp. producing the antibiotics phenazine-1-carboxylic acid (Phz(+)) and 2,4-diacetylphloroglucinol (Phl(+)) in the rhizosphere of wheat grown in the low-precipitation zone (150 to 300 mm annually) of the Columbia Plateau of the Inland Pacific Northwest. Population sizes and plant colonization fr...

As reported in our previous paperslf2), (3R,4R, 5#,6#)-6-(trifluoroacetamido)-3,4,5-trihydroxypiperidine-3-carboxylic acid (tentatively named SF 1 ) and (35,4S',5K,6^)-6-(trifluoroacetamido)-4, 5-dihydroxypiperidine-3-carboxylic acid (SF4) which were synthesized as trifluoroacetamide analogues of siastatin B3) (Fig. 1), were highly inhibitory against /?-glucuronidase (EC 3.2.1.31) from bovine l...

The racemic title compound, C(14)H(24)O(2)·C(3)H(6)O(2), crystallizes in the monoclinic space group P2(1)/c as a 1:1 diol/carboxylic acid cocrystal, A-B. The lattice incorporates infinite chains of the alcohol-carboxylic acid-alcohol supra-molecular synthon, (⋯O-H⋯O=C(R)-O-H⋯O-H⋯), in which the hydrogen-bonded mol-ecules (A-B-A)(n) surround a pseudo-threefold screw axis. The carboxylic acid gro...

In this work, we studied the effect of carboxylic acid on the rheological properties of a high-alumina cement mortar (CH45) produced by the Algerian firm REFRACTAL.The investigated properties are setting time, water consumption, electrical conductivity, pH, density and the compressive strength. The results show a setting time of about 200 min for the acid...

Determination of the structure of heparin-derived oligosaccharides by (1)H NMR is challenging because resonances for all but the anomeric protons cover less than 2 ppm. By taking advantage of increased dispersion of resonances for the anomeric H(1) protons at low pD and the superior resolution of band-selective, homonuclear-decoupled (BASHD) two-dimensional (1)H NMR, the primary structure of th...

with urease. A third minor metabolite was present in urine collected after intraperitoneal administration but remains unidentified. The quantitative distribution of pterin-dcarboxylic acid and urea in the 0-24 h urine samples is shown in Table 1. Fukushima & Nixon (1980) reported the degradation of [2-14C]pterin-6-carboxylic acid to 14C02 by the gut microorganisms of the rat. It is possible tha...

The compounds, 2-(methylsulfonyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylic acid (DM3), 2-(phenylsulfonyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylic acid (DM(4)), and 2-(p-toluenesulfonyl)-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylic acid (DM(5)) were synthesized by coupling of 1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole-3-carboxylic acid (DM(2)) with methanesu...