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6. Effect of anti bacterial skin secretion of 'Rana ridibanda' frog on methycillin resistant staph aureus

Author

Mohammad Amin Abbasi, Mosaffa, N., Taheri, S., and Jaafari, K. M.

Subjects
integumentary system, Anti Bacterial Effect, Methycillin Resistant Staph Aureus (MRSA), Minimum Inhibitory Concentration, Peptide, lcsh:R, lcsh:Medicine, Rana Ridibanda, lcsh:Q, biochemical phenomena, metabolism, and nutrition, lcsh:Science
Abstract

The dorsal skin of the Iranian frog, Rana ridibanda, is associated with numerous prominent granular glands which extract their secretions in the response to stressor or invading pathogens .The secretions have broad spectrum antimicrobial effects. In this research the effect of antimicrobial skin secretions from Iranian frog (Rana ridibanda) has been examined against gram positive Methycillin Resistant Staph Aureus (MRSA), under sterile conditions. To show this effect, 1cm² of frog skin was cultured in complete tissue culture medium containing RPMI, FBS and FUNGISON for the period of 10 days. Immediately after, MRSA was exposed to frog skin secretion (medium culture) and Vancomycin. The results showed that the frog skin secretions has significant antimicrobial effect against MRSA. The range of inhibition zone for MRSA was the same as (20mm) Vancomycin in DISK method. In Minimum Inhibitory Concentration method, for MRSA, the tube 1/8 was positive.

7. Structural characterization and magnetic properties of divanadates ZnMV2O7 (M=Co, Ni and Cu)

Author

Salah, A. Ait, Benkhouja, K., Jaafari, K., de Paz, J. Romero, Climent, E., and Sáez Puche, R.

Subjects
*MAGNETIC susceptibility, *TEMPERATURE measurements, *TRANSITION metals, *CATIONS
Abstract

Abstract: Divanadates of general formula ZnMV2O7 (M=Co, Ni and Cu) have been prepared as powdered samples and the X-ray structural determination and magnetic studies have been carried out. Both ZnCoV2O7 and ZnNiV2O7 crystallize with the so-called dichromate structure type, showing monoclinic symmetry, space group P21/c, while the third member of this family of vanadates ZnCuV2O7 shows the thortveitite structure type with monoclinic symmetry, space group C2/c. Magnetic susceptibility and specific heat measurements reveal that these derivatives behave as antiferromagnets and the estimated Néel temperatures are 4.5, 3.5 and 5.3K for cobalt, nickel and copper vanadates, respectively. In all cases, the one-dimensional magnetic behavior that present the M2V2O7 vanadates is broken down when the magnetic cation M is half replaced by the diamagnetic Zn2+ to give the ZnMV2O7 samples studied in the present work. [Copyright &y& Elsevier]

Published
2005
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