Isotope shift studies in the second spectrum of neodymium in UV region

Isotope shift (IS) Δσ (142–150) have been measured in 92 spectral lines of Nd⁺ in the region 3290–3955 Å, employing recording Fabry-Perot spectrometer and highly enriched isotopic samples excited in a liquid-nitrogen cooled hollow cathode. Earlier IS measurement in UV region of Nd II spectrum is available for only a few lines, New classification has been made for several of the spectral lines studied presently. We have also revised the earlier suggested classification for some of the Nd II lines on the basis of observed isotope shifts. The transitions presently studied mostly involve high lying odd parity energy levels above 30,000 cm^?1 having neither electronic configuration assignment nor term isotope shifts (ΔT) evaluated. The present study would thus enable to evaluate ΔT values of some of these high lying odd levels, which should be helpful in suggesting possible electronic configurations.     

Mixed convection over a semi-infinite horizontal plate

Mixed convection over a horizontal plate has been studied by the method of series truncation for the two cases where the buoyancy effects aid and oppose the main flow. From the Navier-Stokes equations in parabolic coordinates the equations for the first truncation are obtained. The numerical results show that the predictions are very accurate for heat transfer over the entire mixed convection domain. The skin friction predictions are accurate only for moderately large buoyancy effects. In the buoyancy dominated flow the heat transfer is over estimated by four percent and skin friction by thirty percent.

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Zusammenfassung Gemischte Konvektion entlang einer horizontalen Platte wurde untersucht mit Hilfe der Methode der abgebrochenen Reihen. Die beiden Fälle in denen der Auftrieb die Hauptströmung unterstützt und behindert wurden betrachtet. Die Reihen wurden von den Navier-Stokes'schen Gleichungen in parabolischen Koordinaten erhalten. Die numerischen Ergebnisse sind sehr genau für den Wärmeübergang im ganzen Gebiet der gemischten Konvektion. Die Wandreibung wird nur im Falle von mässig grossen Auftriebseffekten genau vorausgesagt. Bei grossem Auftrieb wird der Wärmeübergang um vier Prozent und die Reibung um dreissig Prozent überschätzt.

     

Determination of zirconium and hafnium in solution by X-ray fluorescence spectrometry

The samples were introduced into the XRF spectrometer in ordinary flat bottom polyethylene bottles for the estimation of Zr or Hf in presence of one another in solution. By using high voltage (50 kV) and high current (50 mA) least limits of detection obtained were an order of magnitude better than other conventional analytical techniques. Relations of intensity to concentration in various concentration ranges have been determined and the results are compared with those of other analytical techniques.     

Effects of anti-GLUT antibodies on glucose transport into human erythrocyte ghosts

We have studied the effects of anti-GLUT1 antibodies on the uptake of glucose into erythrocytes. Glucose transport into human erythrocyte ghosts was measured directly using 3H-2-deoxy-glucose, or indirectly by monitoring associated volume changes using light scattering. The uptake of glucose was significantly inhibited in ghosts resealed in solutions containing specific antibodies against GLUT1. Such an effect was not observed when an antibody against the oestrogen receptor, lacking specificity towards GLUT1, was employed instead. The antibodies were also without effect on the efflux of preloaded glucose from erythrocyte ghosts. The demonstration that anti-GLUT antibodies can inhibit glucose uptake is support for the hypothesis that they exaggerate the cytoplasmic barrier to glucose uptake created by endofacial segments of GLUT1.     

Concurrent Analysis of the Biologically Active Markers β-Amyrin and β-Sitosterol by Applying a Validated High-Performance Thin-Layer Chromatography Method in the Aerial Parts of Tinospora cordifolia and Calotropis gigantia

JPC – Journal of Planar Chromatography – Modern TLC - In this study, we have developed a validated high-performance thin-layer chromatography (HPTLC) method for the concurrent...     

On the Reducibility of a Class of Linear Almost Periodic Differential Equations

In this paper, we use KAM methods to prove that there are positive measure Cantor sets such that for small perturbation parameters in these Cantor sets a class of almost periodic linear differential equations are reducible.     

Equilibrium and kinetic study of novel methyltrimethoxysilane magnetic titanium dioxide nanocomposite for methylene blue adsorption from aqueous media

Novel magnetic titanium dioxide nanoparticles decorated with methyltrimethoxysilane (Fe₃O₄@TiO₂‐MTMOS) were successfully fabricated via a sol–gel method at room temperature. The synthesized material was characterized using Fourier transform infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, thermogravimetric analysis and vibrating sample magnetometry. The removal efficiency of the adsorbent was evaluated through the adsorption of methylene blue (MB) dye from water samples. The adsorption isotherm and kinetics were evaluated using various models. The Langmuir model indicated a high adsorption capacity (11.5 mg g^?1) of Fe₃O₄@TiO₂‐MTMOS. The nanocomposite exhibited high removal efficiency (96%) and good regeneration (10 times) compared to Fe₃O₄ and Fe₃O₄@TiO₂ at pH = 9.0. Based on the adsorption mechanism, electrostatic interaction plays a main role in adsorption since MB dye is cationic in nature at pH = 9, whereas the adsorbent acquired an anionic nature. The newly synthesized Fe₃O₄@TiO₂‐MTMOS can be used as a promising material for efficient removal of MB dye from aqueous media.     

Investigation on the effect of cottonseed oil blended with different percentages of octanol and suspended MWCNT nanoparticles on diesel engine characteristics

Journal of Thermal Analysis and Calorimetry - In the present work, a series of experiments were designed and conducted to prepare biodiesel from cottonseed oil and to blend it with octanol. The...     

An explorative study on diarylquinoline-based inhibitor targeting Enterococcus faecium MurF

Structural Chemistry - Enterococcus faecium MurF (EfMurF) enzyme catalyzes the addition of d-alanyl-d-alanine to form murein UDP-N-acetylmuramoyl-pentapeptide. This is the last cytoplasmic step of...