The aim of this paper was to investigate the mechanism(s) involved in the sodium oxalate pro-oxidative activity in vitro and the potential protection by diphenyl diselenide ((PhSe)2) and diphenyl ditelluride ((PhTe)2) using supernatants of homogenates from brain, liver and kidney. Oxalate causes...

The results of feeding experiments conducted with 13C-labeled acetates, 15N-labeled phenyl-alanine, and 14C-labeled phenylalanine in fermentations of Cylindrocladium ilicicola MFC 870 are consistent with the polyketide pathway to ilicicolin H, the principal metabolite. The origin of the 5-(4-hyd...

We have compared the efficacy of inhibition of the cytochrome bc1 complexes from yeast and bovine heart mitochondria and Paracoccus denitrificans by antimycin, ilicicolin H, and funiculosin, three inhibitors that act at the quinone reduction site at center N of the enzyme. Although the three inh...

Ilicicolin H is a broad spectrum antifungal agent showing sub micro g/mL MICs against Candida spp., Aspergillus fumigatus and Cryptococcus spp. It is a potent inhibitor (C50 2–3 ng/mL) of the mitochondrial cytochrome bc1 reductase with over 1000-fold selectivity against rat liver cytochrome bc1...

The biotransformation of natural product is a powerful method for the functionalization of small molecules, particularly oxidation of unactivated carbons. Ilicicolin H is a tetracyclic antifungal agent consisting of a decalin moiety and a phenyl-pyridone unit. The lipophilic decalin unit is devo...

An electrochemical technique has been utilized to obtain thermodynamic information on the graphite-bisulfate lamellar compounds. The compounds C24+·HSO4−· 2.5H2SO4, C48+·HSO4−·2.5H2SO4 and C72+·HSO4−·2.5H2SO4 were prepared by electrolysis of graphite in sulfuric acid. Emf measurements were...

In an attempt to study the expansion characteristics of natural graphite in presence of two different oxidizing agents in concentrated acid medium, potassium permanganate and potassium dichromate have been chosen. Under identical reaction conditions, for the same concentrations of oxidizing agen...

Graphite oxide synthesis dynamics were investigated using a sampling technique. The synthesis of graphite oxide was carried out by a modified Hummers’ method. Small samples of the solid phase (30–50 mg) were collected from the reaction mixture and analyzed by thermogravimetric analysis, differ...

Thermal analysis and other techniques were employed to characterize two expandable graphite samples. The expansion onset temperatures of the expandable graphite's were ca. 220 °C and 300 °C respectively. The key finding is that the commercial products are not just pure graphite intercalat...

In this study, phenolic resole resin was modified at polymeric level with a particulate additive (intercalated graphite (IG)), and its effect on mechanical, thermal and rheological properties was studied. Intercalated graphite was prepared via liquid phase intercalation method using H2SO4 as the...

The second stage lamellar compound of graphite-bisulfate was obtained by annealing a residue compound at 100°–150°C under vacuum. The third stage lamellar compound was obtained by just evacuation or by annealing at 200°C under vacuum. It was found that the lamellar compound of graphite-bisul...

Graphite intercalation compounds (GIC) have received global attention in the last decade because of the growing number of applications of these materials. Conventionally, bisulfate intercalated graphite is synthesized by chemical intercalation; which requires concentrated sulfuric acid (98%) and...

Exfoliated graphite (EG) containing CoFe2O4 was obtained by impregnation of expandable graphite in mixed solution of FeCl3 and Co(NO3)2 and subsequent thermal treatment of expandable graphite at 1000 oC in air atmosphere. Expandable graphite based on graphite bisulfate of I and II stages, graphi...

Exfoliated graphite was obtained by thermal treatment at temperatures of 600, 800, 1000 °C of expandable graphite based on graphite bisulfate of I, II, III and IV stages. The aim of this work is to study the influence of stage number and exfoliation temperature on macrostructure and microstruct...

Graphene produced from electrochemical exfoliation of graphite show a scatter in the number of layers. This scatter is a serious drawback for sensor and opto-electronic applications since the electronic properties of graphene change with number of layers. The scatter in the layer number of graph...

The binary systems of the rare-earth elements (except Eu and Lu) with bismuth, have been examined using X-ray and metallographic techniques. The phases identified were RBi2 (LaBi2-type), RBi (NaCl-type), R4Bi3 (antiTh3P4-type), R5Bi3 (Mn5Si3-type), R5+xBi3 (Y5Bi3-type) and R2Bi (La2Sbtype). The ...

The 12 equiatomic ternary compounds NbFeSb, NbCoSb, TaCoSb, TRuSb (T=Ti, Zr, Hf, V, Nb, Ta), NbRhSb, ZrCoBi and ZrNiBi crystallize with the face-centered cubic MgAgAs-type structure. The atom distribution on the three sites of this structure was established through Rietveld refinements of X-ray ...

Publisher SummaryMany of the structure types found in bismuthides are the same as in the antimonides. This chapter reviews known rare earth–bismuth phases and focuses on compositional and structural data, accompanied by brief descriptions of physical property data. It also summarizes data on bi...

The standard enthalpies of formation for some lutetium alloys in the binary systems Lu-X (where X=C, Si, Ge, Sn, B, Al) have been determined by direct synthesis calorimetry at 1473±2 K. The following values of ΔH0f in kJ g.atom−1 are reported: LuC2 −26.7±1.8; LuSi −78.3±2.1; Lu5Ge3 −73.8±1....

Using as initial data the most reliable values of standard entropy for 10 compounds, the entropies for 40 compounds of non-transition metals, rare-earth metals and actinides have been evaluated by the method of comparative calculation. Taking into account the features of boride structures, two m...