نتایج جستجو برای: vanadium loading

تعداد نتایج: 84124  

Fateme Asjodi Seyyed Khatiboleslam Sadr Nejad

Vanadium is distributed widely and scarcely (150 ppm) on the earth. Its major applications are in steelmaking, dye-production and catalyst-fabrication industries. With the ever-increasing demand for this metal, secondary resource-exploitation of such waste materials as spent catalysts is recommended. Many reactions are involved in vanadium-extraction from these resources. Since roasting in comp...

Abdollah Fallah Shojaei, Alimorad Rashidi, Mina Ghias Robabeh Mousavi

In this study at first, in laboratory, three types of vanadium oxide were produced by using porous graphene and amine framework in hydrothermal method nanostructures such as: vanadium oxide - octadecyl amine - graphene, vanadium oxide - dodecyl amine - graphene and vanadium oxide – aniline - graphene (V-ODA-G، V-DDA-G، V-A-G). Then their structures and functions in propane dehydrogenation react...

Journal: :Biochimica et biophysica acta 2005
Masao Yoshihara Tatsuya Ueki Takahiro Watanabe Nobuo Yamaguchi Kei Kamino Hitoshi Michibata

Some ascidians accumulate high levels of the transition metal vanadium in their blood cells. The process of vanadium accumulation has not yet been elucidated. In this report, we describe the isolation and cDNA cloning of a novel vanadium-binding protein, designated as VanabinP, from the blood plasma of the vanadium-rich ascidian, Ascidia sydneiensis samea. The predicted amino acid sequence of V...

Journal: :CrystEngComm 2013
Olga Goncharova-Zapata Pabitra B Chatterjee Guangjin Hou Laurence L Quinn Mingyue Li Jenna Yehl Debbie C Crans Tatyana Polenova

A series of vanadium(V) complexes with o-dioxolene (catecholato) ligands and an ancillary ligand, (N-(salicylideneaminato)ethylenediamine) (hensal), were investigated using 51V solid-state magic angle spinning NMR spectroscopy (51V MAS NMR) to assess the local environment of the vanadium(V). The solid-state 51V NMR parameters of vanadium(V) complexes with a related potentially tetradentate anci...

Journal: :Chemical communications 2010
Victor Chechik Marco Conte Trevor Dransfield Michael North Marta Omedes-Pujol

During asymmetric cyanohydrin synthesis catalysed by vanadium(V)oxo(salen) complexes, the catalysts are reduced to vanadium(IV)oxo(salen) as determined by EPR spectroscopy; the reducing agent is cyanide which is oxidised to cyanogen via a non-radical mechanism.

Journal: :international journal of reproductive biomedicine 0
sadhana shrivastava deepmala joshi monika bhadauria sangeeta shukla ramesh mathur

background: vanadium is an important environmental and industrial pollutant. it has a status of reproductive toxicant and is reported to cross placental barrier. objective: the current study was performed to assess the therapeutic efficacy of tiron and its combination with selenium against vanadium induced toxicity in lactating and suckling rats. materials and methods: rats were exposed to vana...

2011
M. E. Sawan Mohamed E. Sawan

Calculations were performed to quantify the damage parameters in the leading candidate structural and plasma facing materials when used in magnetic and inertial confinement fusion systems and when irradiated in fission reactors. The structural materials considered are ferritic steel, austenitic steel, vanadium alloy and SiC/SiC composite. Plasma facing materials included beryllium, tungsten, an...

2010
Anke Walter Rita Herbert Christian Hess Thorsten Ressler

The local structure of vanadium oxide supported on nanostructured SiO2 (VxOy/SBA-15) was investigated by in situ X-ray absorption spectroscopy (XAS). Because the number of potential parameters in XAS data analysis often exceeds the number of "independent" parameters, evaluating the reliability and significance of a particular fitting procedure is mandatory. The number of independent parameters ...

Journal: :journal of physical & theoretical chemistry 2015
m. r. shishehbore r. jokar h. dashti khavidaki

this study describes a new simple, sensitive and selective catalytic kinetic spectrophotometricmethod for the determination of vanadium (v). the method is based upon the catalytic effect ofvanadium (v) on the oxidation of carminic acid by bromate in sulfuric acid media. the reaction wasfollowed spectrophotometrically by measuring the decrease in absorbance at 490 nm and thedependence of sensiti...

2017
Szymon Kowalski Stanisław Hać Dariusz Wyrzykowski Agata Zauszkiewicz-Pawlak Iwona Inkielewicz-Stępniak

The pancreatic cancer is the fourth leading cause of cancer-related death and characterized by one of the lowest five-year survival rate. The current therapeutic options are demonstrating minimal effectiveness, therefore studies on new potential anticancer compounds, with non-significant side effects are highly desirable. Recently, it was demonstrated that vanadium compounds, in particular orga...

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