This is an original work on catalytic performance of urease in organic synthesis which in one-pot dissociation of urea and condensation of the in situ generated ammonia with aldehydes, acetophenones, and malononitrile occurs in water to give 2-amino-3-cyanopyridines. Comparative experiments with...

Synthesis of pyrazolo[1,5‐a]pyrimidines, [1,2,4]triazolo[1,5‐a]pyrimidine, 8,10‐dimethyl‐2‐(5‐methyl‐1‐phenyl‐4,5‐dihydro‐1H‐1,2,3‐triazol‐4‐yl)pyrido[2′,3′:3,4]‐pyrazolo[1,5‐a]pyrimidine, benzo[4,5]imidazo[1,2‐a]pyrimidine via heterocyclic amines, and sodium 3‐hydroxy‐1‐(...

The composite of MnO and carbon pyrolysis from PTCDA (named as MnO/Cp) has been synthesized via a facile adsorption of Mn2+ on 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA), followed by thermal annealing process. PTCDA is employed as a precursor of carbon and forms a tube shape via calcin...

Catalysts for O 2 reduction in acidic media were prepared from the pyrolysis of Fe acetate adsorbed on perylenetetracarboxylic dianhydride (PTCDA) in Ar:H 2 :NH 3 ambient. The amount of adsorbed Fe acetate ranged from 0 to 25600 ppm Fe nominal. Catalysts are obtained when...

The organic molecule 3,4,9,10-perylenetetracarboxylic-3,4,9,10-dianhydride (PTCDA) deposited on Au(100) has been investigated by scanning tunneling spectroscopy (STS). For this purpose, highly ordered ultrathin PTCDA films have been prepared by organic molecular beam epitaxy. Single point curren...

. The structure of thin 3,4,9,10-perylenetetracarb-oxylic-dianhydride (PTCDA) films on Cu(110) was studied by scanning tunnelling microscopy (STM) from submonolayer to monolayer coverage. While no long-range ordering was found after deposition at room temperature, the formation of a well-defined...

The high-resolution laser-induced fluorescence (LIF) electronic spectrum associated with the 1 1 A g ->1 1 B 1 u transition in the perylenetetracarboxylic-dianhydride (PTCDA) molecule is discussed in terms of time-dependent density functional theory at TD-B3LY...

Raman spectroscopy is employed to investigate in situ the structural properties and the morphology of 3,4,9,10-Perylene-TetraCarboxylic DiAnhydride (PTCDA) films deposited onto S-GaAs(100) substrates at various temperatures. Additional two-dimensional Raman mapping measurements are carried out e...

The optical functions of PTCDA have been determined by spectroscopic ellipsometry. The samples were prepared by thermal evaporation of PTCDA on glass substrates. The influence of the substrate temperature on the properties of PTCDA films has also been investigated. The lowest substrate temperatu...

The indirect cathodic reduction of dispersed vat dyes CI Vat Yellow 1 and CI Vat Blue 5 was investigated by cyclic voltammetry and spectroelectrochemistry. N,N-bis(2-hydroxyethyl)-3-amino-2-hydroxy-propane-sulfonic acid and 2,2-bis-(hydroxyethyl)-(iminotris)-(hydroxymethyl)-methane were used as ...

A food grade natural mucilage, extracted from the seeds of Tamarindus indica pods, is used as a flocculant for removal of solubilised vat (golden yellow) and direct dye (direct fast scarlet) in aqueous solutions. The maximum removal obtained was 60% for golden yellow after 2h and was 25% for dir...

Heroin, morphine and narcotine are very large molecules having 50, 40 and 53 atoms respectively. Moderately high resolution photoacoustic (PA) spectra have been recorded in 9.6 µm and 10.6 µm regions of CO2 laser. It is very difficult to assign the modes of vibrations for PA bands by compariso...

Between 1995 and 2001, the share of green tax revenues in the EU-15 GDP slightly declined. This is a surprising evolution but there are, however, strong economic efficiency arguments to set environmental taxes at low levels, and hence below the Pigovian or marginal pollution damage level. This p...

meta-Aramid fibers have an excellent heat-resistant property and are widely used for protective clothings such as fire-fighter suit and racing suit. They can also be used as military uniforms such as flight suit or army uniform. Vat dyes are specially used for military uniforms owing to outstand...

Iron-deposited graphite surfaces were prepared, characterized and employed as cathode materials for electrochemical vat-dyeing process containing very low concentration of sodium dithionite. The electrodeposition, in presence of ammonium thiocyanate and gelatin or animal glue as binding additive...

Vat and sulfur dyes must be reduced to their leuco forms before application. Since this process is currently carried out using irreversible reducing chemicals, it involves high economic and environmental costs. Here we show that reduction can alternatively be performed in an alkaline bath at roo...

Senna leaf is widely consumed as tea to treat constipation or to aid in weight loss. Sennoside A, A1, and B are dirheinanthrone glucosides that are abundant and the bioactive constituents in the plant. They are isomers that refer to the (R*R*), (S*S*), and (R*S*) forms of protons on C‐10 and C‐...

To address the possibility that sennoside B inhibition of cell proliferation is mediated via interference with platelet-derived growth factor (PDGF) signaling.Human osteosarcoma MG63 cells were treated with PDGF in the presence or absence of sennoside B. Activation of the PDGF signaling pathway ...

Cassia angustifolia Vahl, a chief source of anthraquinone glycosides (sennosides), extensively employed as a laxative is also reported to possess significant anticancerous activity against various cancer cell lines. HPLC analysis of different in vivo plant parts viz., leaves, nodes, roots and se...

Despite the availability of effective antiretroviral therapies, drugs for HIV-1 treatment with new mode of action are still needed. An innovative approach is aimed to identify dual HIV-1 inhibitors, small molecules that can inhibit two viral functions at the same time. Rhubarb, originated from R...