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Dependence on cation distribution of particle size, lattice parameter, and magnetic properties in nanosize Mn–Zn ferrite (2002)

Rath, Chandana ; Anand, S. ; Das, R. P.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 91 (2002), S. 2211-2215

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In Mn1−xZnxFe2O4 (x=0 to 1) nanosize particles prepared through hydrothermal precipitation we observe a decrease in particle size from 13 to 4 nm with increasing Zn concentration from 0 to 1. The lattice constant, a, for all Mn/Zn concentrations is found to be less than that for the corresponding bulk values. At specific compositions within x=0.35 and 0.5, the temperature dependence of the magnetization exhibits a cusp-like behavior below the temperature at which the nanoparticles undergo a ferri- to para-magnetic transition (Tc). The Curie temperatures, Tc, of the nanoparticles are in the range of 175–500 °C, which are much higher than their corresponding bulk values. To explain these unusual features, the strong preferential occupancy of cations in chemically inequivalent A and B sites and the metastable cation distribution in nanoparticles are invoked. © 2002 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1432474

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Evidence For The Existence Of A Constitutive Nitric Oxide Synthase In Vascular Smooth Muscle (2002)

Cheah, LS ; Gwee, MCE ; Das, R ; [et al.]

Oxford, UK : Blackwell Science Pty

Clinical and experimental pharmacology and physiology 29 (2002), S. 0

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ISSN: 1440-1681

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: 1. We have identified a neuronal nitric oxide synthase (NOS)-like constitutive form of NOS in vascular smooth muscle (VSM) using a functional contractility approach as well as immunohistochemical methods.2. NG-Nitro-L-arginine methyl ester, NG-monomethyl-L- arginine and NG-nitro-L-arginine (L-NOARG), the competitive inhibitors of NOS, inhibited Mg2+-induced relaxation of de-endothelialized rat aorta precontracted with phenylephrine (PE). This Mg2+ relaxation of VSM was not affected by inhibitors of inducible NOS.3. Electrical field stimulation (EFS; 30–70 Hz) caused relaxation of rat aorta in the presence of tetrodotoxin (therefore not a neurogenic effect) and this EFS relaxation was effectively inhibited by L-NOARG, oxyhemoglobin and methylene blue.4. Immunohistochemical studies of dog saphenous vein using antibodies raised against neuronal NOS indicated prominent staining along the plasmalemma in a punctate pattern similar to the distribution of antibodies against caveolin-1, a major constituent of the plasmalemmal caveolae.5. We propose that a constitutive NOS of non-endothelial, non-neuronal origin is present in a special caveolae domain of VSM cell membranes and could be activated by an ionic mechanism yet to be characterized.