The natural occurrence of optically active isocitric acid was first demonstrated by Nelson' and Bruce(2) in blackberry fruits, and a somewhat large accumulation of the acid was found by Pucher et al. 3~ in Bryophyllum leaf tissue. This acid has also been recognized as a member of the tri-carboxylic acid cycle in many animals, plants and microorganisms. All isocitric acid, found before in nature...

3-Dehydroquinate synthase was purified to homogeneity from Escherichia coli. It was found to be a single polypeptide chain of M, = approximately 57,000. Reaction mixtures of pure enzyme and the substrate, 3deoxy-n-arabino-heptulosonic acid 7-phosphate, were incubated for short times and treated with NaB3H4. The resulting 3-deoxyheptonic acid 7-phosphate was degraded with sodium periodate, and f...

Potentially, the toxicity of multiwalled carbon nanotubes (MWCNTs) can be reduced in a safe-by-design strategy. We investigated if genotoxicity and pulmonary inflammation MWCNTs from same batch were lowered by a) reducing length b) introducing COOH-groups into structure. Mice administered: 1) long pristine MWCNT (CNT-long) (3.9 μm); 2) short CNT (CNT-short) (1 3) modified with high ratio (CNT-C...

the interaction between some heavy metal ions such as of pb(ii), cd(ii) and cu(ii) ions from aqueous solution adsorbed by single walled carbon nanotube (swcnts) and carboxylate group functionalized single walled carbon nanotube (swcnt-cooh) surfaces were studied by atomic absorption spectroscopy. the effect of contact time, ph, initial concentration of ion, ionic strength and temperature on the...

A novel acid-base HT-PEM consisting of PI-COOH and OPBI was prepared. The OPBI-50PI-COOH composite membrane delivered superior cell performance durability under low PA uptake due to the continuous hydrogen bond network between PI-COOH.

The effect of carboxyl groups on the redox activity polyluminol-carbon nanotube composites was studied. Carboxyl were selected due to their known contributions toward surface wettability and pseudocapacitance while often present naturally derived low-cost porous carbons. Density functional theory (DFT) predicted energetically favoured bonding a significantly reduced band gap between luminol car...

The interaction between some heavy metal ions such as of Pb(II), Cd(II) and Cu(II) ions from aqueous solution adsorbed by single walled carbon nanotube (SWCNTs) and carboxylate group functionalized single walled carbon nanotube (SWCNT-COOH) surfaces were studied by atomic absorption spectroscopy. The effect of contact time, pH, initial concentration of ion, ionic strength and temperature on the...

The interaction between some heavy metal ions such as of Pb(II), Cd(II) and Cu(II) ions from aqueous solution adsorbed by single walled carbon nanotube (SWCNTs) and carboxylate group functionalized single walled carbon nanotube (SWCNT-COOH) surfaces were studied by atomic absorption spectroscopy. The effect of contact time, pH, initial concentration of ion, ionic strength and temperature on the...