Central University of Kerala

About: Central University of Kerala is a education organization based out in Kāsaragod, India. It is known for research contribution in the topics: Population & Catalysis. The organization has 556 authors who have published 881 publications receiving 7474 citations.

Coconut inflorescence sap mediated synthesis of silver nanoparticles and its diverse antimicrobial properties

Abstract: Green synthesis of nanoparticles (NPs) involves the use of diverse extracts of biological origin as substrates to synthesize nanoparticles and can overcome the hazards associated with chemical methods. Coconut inflorescence sap, which is unfermented phloem sap obtained by tapping of coconut inflorescence, is a rich source of sugars and secondary metabolites. In this study, coconut inflorescence sap was used to synthesize silver nanoparticles (AgNPs). We have initially undertaken metabolomic profiling of coconut inflorescence sap from West Coast Tall cultivar to delineate its individual components. Secondary metabolites constituted the major portion of the inflorescence sap along with sugars, lipids and, peptides. The concentration of silver nitrate, inflorescence sap and incubation temperature for synthesis of AgNPs were optimized. Incubating the reaction mixture at 40°C was found to enhance AgNP synthesis. The AgNPs synthesized were characterized using UV-Visible spectrophotometry, X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). Antimicrobial property of AgNP was tested in tissue culture of arecanut (Areca catechu L.) where bacterial contamination (Bacillus pumilus) was a frequent occurrence. Significant reduction in the contamination was observed when plantlets were treated with aqueous solutions of 0.01, 0.02 and 0.03% of AgNPs for one hour. Notably, treatment with AgNPs did not affect growth and development of the arecanut plantlets. Cytotoxicity of AgNPs was quantified in HeLa cells. Viability (%) of HeLa cells declined significantly at 10 ppm concentration of AgNP and complete mortality was observed at 60 ppm. Antimicrobial properties of AgNPs synthesized from inflorescence sap were also evaluated and confirmed in human pathogenic bacteria viz., Salmonella sp., Vibrio parahaemolyticus, and Escherichia coli. The study concludes that unfermented inflorescence sap, with above neutral pH, serves as an excellent reducing agent to synthesize AgNPs from Ag+.

Magnetic and FMR Study on CoFe $_{2}$ O $_{4}$ /ZnFe $_{2}$ O $_{4}$ Bilayers

Abstract: CoFe2O4/ZnFe2O4 bilayers were deposited by the pulsed laser deposition on amorphous fused quartz substrate at substrate temperature of 350°C and in oxygen pressure of 0.16 mbar. The films were studied after ex-situ annealing for 2 h in air at various temperatures up to 650°C. The magnetic properties of the bilayers were studied at 300 K and at 10 K. Ferromagnetic resonance was carried out at x-band frequencies at room temperature. It was found that as a result of annealing, the diffusion between Co ferrite and Zn ferrite starts around 350°C and leads to a large line width system having magnetization, which remains undetected by Ferromagnetic resonance.

Mass Multiplication of Gymnema sylvestre (Retz.) R. Br. ex Schult. Through In vitro Shoot Organogenesis from Callus

Abstract: For large scale production through shoot organogenesis from callus, seeds of Gymnema sylvestre were cultured on MS containing various concentrations of 2,4-D An optimum callusing (6240%) was observed on MS with 15 mg/l 2,4-D Upon transfer to multiplication medium, the calli multiplied 25 times in 45 days The calli were then tested for shoot induction and an optimum result in terms of both per cent response (5204%) and an average number of shoots (472) were observed on MS supplemented with 10 mg/l BAP Maximum shoot elongation was obtained on 05 mg/l Kn and best rooting took place on half strength MS with 05 mg/l IBA This protocol can be followed for the large scale in vitro multiplication of G sylvestre Plant Tissue Cult & Biotech 30(1): 27-32, 2020 (June)

On a reducibility of the Kampé de Fériet function

Abstract: The main objective of this research note is to provide an interesting result for the reducibility of the Kampe de Feriet function. The result is derived with the help of two results for the terminating 3F2 series very recently obtained by Rakha et al. A few interesting special cases have also been given. Copyright © 2014 John Wiley & Sons, Ltd.