نتایج جستجو برای: phosphorus pentoxide supported on alumina
تعداد نتایج: 8497374 فیلتر نتایج به سال:
In necrosis of the liver of the dog produced by haemotoxic immune sera, the increased excretion of uric acid, purin bases and inorganic phosphorus pentoxide is the result of the hydrolysis of nuclear material occurring during the autolysis of the necrotic tissue.
The protons on a silica or alu mina su rface can be replaced by manganese( III) porphyrin ca tions, Mn(TPP +). Manganesc(III) porphyrin supported on silica and alumina can activate dioxygen in the presence of additional NaBH4 o r [NBu41rBH41 as an electron source and styrene, affording I-phenyl ethanol and acetophenone in a 4:1 ratio. When oxidation was applied in a mixture of benzene/eth...
The isoniazid, after recrystallization from ethanol and drying over calcium chloride and then over phosphorus pentoxide, had m.p. 1700. Potentiometric titration with alkali (0.1 N-KOH), making use of the pK 10-8 (Albert, 1953) and ultraviolet spectrophotometry (at 262 m,u.), indicated a purity of 99.84%. This material was used to evaluate the published methods of iodometric titration. That cond...
چکیده ندارد.
3-Amino-l,2-benzisothiazole-1,1-dioxides (2b-n) have been prepared by heating saccharin (1) and the hydrochlorides of primary and secondary aliphatic amines with phosphorus pentoxide and N,N-dimethylcyclohexylamine at 240 °C. 3-Aminothieno[3,4-d]isothiazole-1,1-dioxides (6a-c) were similarly prepared from thieno[3,4-d]isothiazol3(2H)-one-1,1 -dioxide (5). 3 1 P NMR spectra were obtained of reac...
Recombinant sucrose-6-phosphate synthase (SpsA) was synthesized in Escherichia coli BL21DE3 by using the spsA gene of the cyanobacterium Synechocystis sp. strain PCC 6803. Transformants exhibited a 10,000-fold increase in survival compared to wild-type cells following either freeze-drying, air drying, or desiccation over phosphorus pentoxide. The phase transition temperatures and vibration freq...
the potential of carbon nanotubes (cnt) supported cobalt catalysts for fischer-tropsch (ft) reaction is shown. using the wet impregnation method cobalt on carbon nanotubes catalysts were prepared with cobalt loading varying from 15 to 45 wt. %. the catalysts are characterized by different methods including: bet physisorption, x-ray diffraction, hydrogen chemisorption, and temperature-programmed...
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