February 2013 Issue Vol.3 No.2

Antimicrobial Activities of Ethanolic Leaf Extracts of S. alata Linn on Post-Harvest Yam (Dioscorea rotundata Poir) Tuber Rot Pathogens.

Tedela#1, P.O., Ijato, J Y*2
#Department of Plant Science, Faculty of Science, Ekiti State University, Ado – Ekiti, P.M.B 5363, Ekiti State, Nigeria.

Abstract: The Antimicrobial effect of ethanolic leaves extract of Senna alata was determined in vitro. It was found that all the varied concentrations of the extracts were effective in inhibiting the mycelia growth of Botryodiplodia theobromae, Aspergillus flavus, Aspergillus niger and Aspergillus glaucus, 40and 50g in 10% ethanol inhibited the radial mycelia growth of A. niger and A glaucus by 96.43%, 30 and 40g in 20% ethanol reduced the radial thrive of mycelia of B. theobromae by 97.10 and 97.07 % respectively, 20g in 30% ethanol, 30 and 40g in 40% ethanol reduced A. flavus by 100%, all the concentrations of extracts in 50% ethanol reduced the radial mycelia extension of A. flavus by 100%. This finding revealed that ethanolic leaves extract of S. alata had significant potential for the control of fungal rot of yam tubers.
Keywords: in vitro, Senna alata, rot pathogens, yam tuber rot

MHD effects on peristaltic flow of a Bingham fluid in a channel with permeable walls

V.Rama Chandraiah*, K.Chakradhar**, R. Siva Prasad***
* Department of Mathematics, Srinivasa Institute of Technology & Science, kadapa, A.P., INDIA
* *Department of Mathematics, Dr.Y.S.R. Engg. College of Technology, Kadapa, A.P., INDIA
*** Department of Mathematics, Sri Krishnadevaraya University, Anantapur, A.P., INDIA

Abstract: MHD effects on peristaltic flow of a Bingham fluid in a channel with permeable walls is studied under long wavelength and low Reynolds number assumptions. This model can be applied to the blood flow in the sense that erythrocytes region and the plasma regions may be described as plug flow and non-plug flow regions. The effect of yields stress, Magnetic parameter, Darcy number and slip parameter on the pumping characteristics is discussed through graphs.

Keywords: Peristaltic transport, Magnetic parameter, Bingham fluid, permeable walls.

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