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61.
Ajay K. Jain Raj P. Singh Sushma Agrawal 《Fresenius' Journal of Analytical Chemistry》1980,302(5):407-409
Summary Solid membranes of -picolinium molybdoarsenate in Araldite are evaluated as Tl(I) selective electrode. The electrode can be used for Tl(I) determinations in the concentration range of 10–1 to 10–5 M. Selectivity coefficient values observed for a number of other metal cations show no interference. Various anions tested did not interfere. The response of the electrode was also evaluated after equilibrating it with a cationic surfactant (CTAB), however this did not considerably improve its behaviour.
Thallium(I)-ionenselektive Elektrode mit Membran aus -Picoliniummolybdoarsenat in Araldit
Zusammenfassung Die Elektrode kann für Tl(I)-Bestimmungen im Bereich von 10–1 bis 10–5 M verwendet werden. Anhand der Bestimmung von Selektivitätskoeffizienten anderer Metallkationen ergab sich keine Störung. Auch zahlreiche Anionen verursachen keine Störung. Die Behandlung der Elektrode mit einem kationischen Tensid (CTAB) wurde ebenfalls untersucht, brachte aber keine weitere wesentliche Verbesserung.相似文献
62.
Layered perovskite-type oxides LnSr2MnFeO7, with Ln?=?La, Nd, Gd, and Dy, have been synthesized by conventional solid-state reaction method. Rietveld refinement shows that all the phases were found to crystallize with tetragonal unit cell in the space group I4/mmm. The unit cell parameters a and c decrease monotonically with decreasing effective ionic radius of the lanthanide ion. The phases show insulating behavior with no anomalous features in the entire temperature range of 150–350 K and the electrical conduction occurs by Mott’s variable range hopping mechanism. The magnetic studies suggest that the phases are antiferromagnetic and the Weiss constant (θ) increases with decreasing ionic radius of lanthanide ion. 相似文献
63.
Sushma Tewari 《Solid State Communications》1973,12(6):437-441
An augmented plane wave calculation of the energy bands of CdO has been performed using two ionicities (0 and ± 1). Energy bands are found to be sensitive to the degree of ionicity assumed.The band structure for ionicity 0 is like that of a metal and the Fermi energy lies inside the conduction band whereas for ionicity ±1, the band structure is like that of a semiconductor and the Fermi energy lies in the Γ-Σ gap just above the valence band maxima at Σ4. 相似文献
64.
S. K. Srivastava Ajay K. Jain Satish Kumar Raj P. Singh Sushma Agrawal 《Journal of Radioanalytical and Nuclear Chemistry》1979,53(1-2):49-57
Ion-exchange papers were prepared by impregnating chromatographic Whatman No. 3 paper with pyridinium tungstoarsenate exchanger. The composition of the material loaded on the paper shows that the compound has the formula (C5H5NH)3 W1 2AsO4 0·Rf values of 30 metal ions were determined on these ion-exchange papers by developing with ascending technique in solvents containing mixtures of n-propanol and hydrochloric or nitric acid. Several binary, ternary and some quaternary separations were also achieved on these papers. Studies were also made on plain papers for comparison. 相似文献
65.
The excess volume of mixing as a function of composition has been measured at 30°C and 40°C for mixtures of propylene carbonate with nitrobenzene, chlorobenzene, benzene, toluene, cyclohexane, dioxane, carbon tetrachloride, and chloroform. The highly polar nitrobenzene forms an ideal mixture with propylene carbonate. Chloroform, carbon tetrachloride, dioxane, chlorobenzene, benzene, and toluene give negative volume changes on mixing. In mixtures with cyclohexane,V
m
E
is positive at lower mole fractions of cyclohexane but becomes negative as the mole fraction of cyclohexane increases. 相似文献
66.
Arpitha Badarinath Mahajanakatti Telugu Seetharam Deepak Raghu Ram Achar Sushma Pradeep Shashanka K Prasad Rajeswari Narayanappa Deepthi Bhaskar Sushravya Shetty Govindappa Melappa Lavanya Chandramouli Sanjukta Mazumdar Ekaterina Silina Victor Stupin Chandrashekar Srinivasa Chandan Shivamallu Shiva Prasad Kollur 《Molecules (Basel, Switzerland)》2022,27(8)
Cancer is one of the leading causes of death worldwide, accountable for a total of 10 million deaths in the year 2020, according to GLOBOCAN 2020. The advancements in the field of cancer research indicate the need for direction towards the development of new drug candidates that are instrumental in a tumour-specific action. The pool of natural compounds proves to be a promising avenue for the discovery of groundbreaking cancer therapeutics. Elaeocarpus ganitrus (Rudraksha) is known to possess antioxidant properties and after a thorough review of literature, it was speculated to possess significant biomedical potential. Green synthesis of nanoparticles is an environmentally friendly approach intended to eliminate toxic waste and reduce energy consumption. This approach was reported for the synthesis of silver nanoparticles from two different solvent extracts: aqueous and methanolic. These were characterized by biophysical and spectroscopic techniques, namely, UV-Visible Spectroscopy, FTIR, XRD, EDX, DLS, SEM, and GC-MS. The results showed that the nanoconjugates were spherical in geometry. Further, the assessment of antibacterial, antifungal, and antiproliferative activities was conducted which yielded results that were qualitatively positive at the nanoscale. The nanoconjugates were also evaluated for their anticancer properties using a standard MTT Assay. The interactions between the phytochemicals (ligands) and selected cancer receptors were also visualized in silico using the PyRx tool for molecular docking. 相似文献
67.
68.
Sushma A. Rawool Rajesh Belgamwar Rajkumar Jana Ayan Maity Ankit Bhumla Nevzat Yigit Ayan Datta Günther Rupprechter Vivek Polshettiwar 《Chemical science》2021,12(16):5774
Converting CO2 directly from the air to fuel under ambient conditions is a huge challenge. Thus, there is an urgent need for CO2 conversion protocols working at room temperature and atmospheric pressure, preferentially without any external energy input. Herein, we employ magnesium (nanoparticles and bulk), an inexpensive and the eighth-most abundant element, to convert CO2 to methane, methanol and formic acid, using water as the sole hydrogen source. The conversion of CO2 (pure, as well as directly from the air) took place within a few minutes at 300 K and 1 bar, and no external (thermal, photo, or electric) energy was required. Hydrogen was, however, the predominant product as the reaction of water with magnesium was favored over the reaction of CO2 and water with magnesium. A unique cooperative action of Mg, basic magnesium carbonate, CO2, and water enabled this CO2 transformation. If any of the four components was missing, no CO2 conversion took place. The reaction intermediates and the reaction pathway were identified by 13CO2 isotopic labeling, powder X-ray diffraction (PXRD), nuclear magnetic resonance (NMR) and in situ attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), and rationalized by density-functional theory (DFT) calculations. During CO2 conversion, Mg was converted to magnesium hydroxide and carbonate, which may be regenerated. Our low-temperature experiments also indicate the future prospect of using this CO2-to-fuel conversion process on the surface of Mars, where CO2, water (ice), and magnesium are abundant. Thus, even though the overall process is non-catalytic, it could serve as a step towards a sustainable CO2 utilization strategy as well as potentially being a first step towards a magnesium-driven civilization on Mars.We demonstrated the use of magnesium nanoparticles (and bulk) to convert CO2 (pure & also from the air) to methane, methanol, formic acid and green cement without external energy within a few minutes, using only water as the sole hydrogen source. 相似文献
69.
Vinusha H. Mariwamy Shiva Prasad Kollur Bindya Shivananda Muneera Begum Chandan Shivamallu Chandan Dharmashekara Sushma Pradeep Anisha S. Jain Shashanka K. Prasad Asad Syed Abdallah M. Elgorban Salim Al-Rejaie Joaquín Ortega-Castro Juan Frau Norma Flores-Holguín Daniel Glossman-Mitnik 《Molecules (Basel, Switzerland)》2022,27(4)
70.
Sushma Singh Laxmi K. Sharma Apoorv Saraswat Ibadur R. Siddiqui Rana K. Pal Singh 《Research on Chemical Intermediates》2014,40(3):947-960
A convenient, efficient and one-pot synthesis of chemically and pharmaceutically interesting symmetrical-2,5-disubstituted-1,3,4-oxadiazoles is reported. The protocol involves anodic oxidation of aldehyde-N-arylhydrazones in anhyd. MeCN–LiClO4. Constant potential electrolysis carried out in an undivided cell and platinum electrodes leads to the formation of the corresponding oxadiazoles under ambient condition and the mechanism was deduced from voltammetry studies. The reaction proceeded smoothly with high atom economy. 相似文献