Study of Cadmium Complexes of Amino Acids at their Isoionic Points : Cd(II)-Amino Acid & Cd(II)- Thiourea- Amino Acid Systems

208-20

Thermodynamics of complex formation of rare earth metal ions with schiff bases in mixed solvent media

1014-1015Proton-ligand stability constants of N-phenyl-2-hydroxy- 5- chioroacetophenoneimine(I) and N-ɑ-naphthyl- 2-hydroxy- 5-chioroacetophenoneimine(II) and metal-ligand stability constants of their complexes with La(III), Ce(III), Pr(III), Nd(III), Sm(III), Gd(III), Tb(I1I), Dy(III) and Yb(III) have been determined at 25°, 35° and 50°C (± 0.02°C) and and μ =0.l M(NaClO4) in 60% ethanol-water medium. The thermodynamic parameters for the formation of 1:1 and 1:2 complexes have been calculated. The metal complexes of the ligand(I) are observed to be enthalpy- and entropy-stabilized. However, the positive values of enthalpy and entropy changes in the case of the 1:2 complexes of ligand(II) show the predominance of the entropy effect

Polarographic Study of Mixed Ligand Complexes: Cd(II)-Oxalate-Phthalate System

63-6

Beam physics research with the IOTA electron lens

The electron lens in the Fermilab Integrable Optics Test Accelerator (IOTA) will enable new research in nonlinear integrable optics, space-charge compensation, electron cooling, and the stability of intense beams. This research addresses scientific questions on high-brightness beams and operational challenges of high-power accelerators for nuclear and particle physics. We review the roles that electron lenses play in this field and the physical principles behind their applications. The design criteria and specifications for the IOTA storage ring and electron lens are then discussed. We conclude with a description of the components of the apparatus

Studies on the antidiarrhoeal activity of Aegle marmelos unripe fruit: Validating its traditional usage

<p>Abstract</p> <p>Background</p> <p><it>Aegle marmelos </it>(L.) Correa has been widely used in indigenous systems of Indian medicine due to its various medicinal properties. However, despite its traditional usage as an anti-diarrhoeal there is limited information regarding its mode of action in infectious forms of diarrhoea. Hence, we evaluated the hot aqueous extract (decoction) of dried unripe fruit pulp of <it>A. marmelos </it>for its antimicrobial activity and effect on various aspects of pathogenicity of infectious diarrhoea.</p> <p>Methods</p> <p>The decoction was assessed for its antibacterial, antigiardial and antirotaviral activities. The effect of the decoction on adherence of enteropathogenic <it>Escherichia coli </it>and invasion of enteroinvasive <it>E. coli </it>and <it>Shigella flexneri </it>to HEp-2 cells were assessed as a measure of its effect on colonization. The effect of the decoction on production of <it>E. coli </it>heat labile toxin (LT) and cholera toxin (CT) and their binding to ganglioside monosialic acid receptor (GM1) were assessed by GM1-enzyme linked immuno sorbent assay whereas its effect on production and action of <it>E. coli </it>heat stable toxin (ST) was assessed by suckling mouse assay.</p> <p>Results</p> <p>The decoction showed cidal activity against <it>Giardia </it>and rotavirus whereas viability of none of the six bacterial strains tested was affected. It significantly reduced bacterial adherence to and invasion of HEp-2 cells. The extract also affected production of CT and binding of both LT and CT to GM1. However, it had no effect on ST.</p> <p>Conclusion</p> <p>The decoction of the unripe fruit pulp of <it>A. marmelos</it>, despite having limited antimicrobial activity, affected the bacterial colonization to gut epithelium and production and action of certain enterotoxins. These observations suggest the varied possible modes of action of <it>A. marmelos </it>in infectious forms of diarrhoea thereby validating its mention in the ancient Indian texts and continued use by local communities for the treatment of diarrhoeal diseases.</p

A Polarographic Study of Mixed Ligand Complexes: Cadmium(II)- Thiourea-Thiocyanate & Cadmium(II)- Thiourea-Thioacetamide Systems

426-42

Solvent extraction and spectrophotometric determination of Fe(II) with 1,3-diphenyl-4- carboethoxy pyrazole-5-one

1105-1106A quick and selective method is developed for extractive spectrophotometric determination of Fe(II) using 1,3-diphenyl-4- carboethoxy pyrazole-5-one as the reagent. The wine-red coloured 1:3 (metal:ligand) complex in chloroform medium absorbs maximally at 525 nm. Beer's law is obeyed in the concentration range 0.5-10 μg/ml of Fe(II). The molar absorptivity and Sandell's sensitivity are found to be 1.156×1031 mol-1 cm-1 and 0.0483 μgcm-2 respectively. The effect of pH, equilibration time, reagent concentration and foreign ions have also been studied. The application of the method has been applied for the determination of Fe(II) in pharmaceutical samples

Design of a compact, cryogen-free superconducting solenoid for the electron lens of the Fermilab Integrable Optics Test Accelerator (IOTA)

The proposed electron lens for Fermilab's Integrable Optics Test Accelerator (IOTA) will broaden its capabilities by enabling new research in nonlinear integrable optics, space-charge compensation, proton beam cooling, and more. The electron lens is based on a 5–10 keV, 1–2 A electron beam, shaped using a 0.7 m long, 0.8 T solenoidal magnetic field. A cryogen-free superconducting solenoid has been designed to provide this solenoidal field, taking into consideration the constraints on space, utilities, and infrastructure in the IOTA experimental hall. The solenoid is made of copper stabilized niobium-titanium conductor, conduction-cooled using 4 K closed-cycle cryocoolers. This paper describes the overall design of the solenoid encompassing its mechanical construction, current leads optimization, cryogenic thermal modeling that provides estimates of cooldown time and static/dynamic heat loads, and quench analysis