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Enhanced Antibacterial Activity of Bifunctional Fe_(3)O_(4)-Ag Core-Shell Nanostructures

Nano Research 2009年第12期2卷 955-965页

作者： Bhupendra Chudasama anjana k.vala Nidhi Andhariya R.V.Upadhyay R.V.Mehta Department of Applied Physics S.V.National Institute of TechnologySurat 395007India Department of Physics Bhavnagar UniversityBhavnagar 364022India P.D.Patel Institute of Applied Sciences Charotar University of Science and TechnologyEducation campusChanga 388421India

We describe a simple one-pot thermal decomposition method for the production of a stable colloidal suspension of narrowly dispersed superparamagnetic Fe_(3)O_(4)-Ag core-shell *** biocompatible nanostructures are highly toxic to *** activity studies were carried out on both Gram negative(Escherichia coli and Proteus vulgaris)and Gram positive(Bacillus megaterium and Staphylococcus aureus)bacterial *** have been made to understand the underlying molecular mechanism of such antibacterial *** effect of the core-shell nanostructures on Gram negative strains was found to be better than that observed for silver *** minimum inhibitory concentration(MIC)values of these nanostructures were found to be considerably lower than those of commercially available *** attribute this enhanced antibacterial effect of the nanostructures to their stability as a colloid in the medium,which modulates the phosphotyrosine profile of the bacterial proteins and arrests bacterial *** also demonstrate that these core-shell nanostructures can be removed from the medium by means of an external magnetic field which provides a mechanism to prevent uncontrolled waste disposal of these potentially hazardous nanostructures.

关键词： Core-shell nanostructure antimicrobial activity minimum inhibitory concentration phase transfer

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An Investigation on Tolerance and Accumulation of a Facultative Marine Fungus Aspergillus flavus to Pentavalent Arsenic

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Journal of Ocean University of China 2010年第1期9卷 65-67页

作者： anjana k.vala Vipul Davariya R.V.Upadhyay Center For Excellence in Nanotechnology of Nanomagnetic Particles C/O Department of PhysicsBhavnagar University

Tolerance of a facultative marine fungus Aspergillus flavus towards As (V) was *** growth of the test isolate was observed in culture media with As (V) concentrations of 25 mg L-1 and 50 mg L-1,indicating its tolerance to the *** rate of arsenic was always higher when exposed to As (V) at 50 mg L-1 than at 25 mg *** study reveals Aspergillus flavus as a promising candidate for environmental *** contents (mg g-1) in the fungus when exposed to 50 mg L-1 As (V) were measured as 11.1773,4.0983,and 8.0000 mg g-1 on day 3,6 and 9,*** highest content was observed initially,*** day 3,followed by a decline and a rise *** results provide baseline information for further explorations regarding the exploitation of the fungus for arsenic removal.

关键词： facultative marine fungi Aspergillusflavus arsenic tolerance bioaccumulation

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