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El-Sheikh E.A.,Zagazig University | Mamtha M.D.,Sri Padmavathi Womens University | Ragheb D.A.,Zagazig University | Ashour M.B.A.,Zagazig University
Egyptian Journal of Biological Pest Control | Year: 2011

Juvenile hormone (JH) is a key hormone in regulation of the insect's life cycle. This role is carefully regulated in insects to successfully develop. Conversely, this careful regulation of JH titer opens a window of attack where a recombinant baculovirus expressing an appropriate protein(s) could disrupt the fine balance in JH titer and consequently the insect life cycle. Juvenile hormone esterase (JHE), a member of the carboxylesterase family (EC 3.1.1.1), contributes to the rapid decline in the JH titer. Therefore, if JHE was introduced prematurely into insect larvae, the enzyme should induce physiological and morphological anti-JH effects by degrading JH at a time when JH biosynthesis is active. Recombinant baculoviruses with JHE proteins represent valuable technology that may has great potential for effective integration into pest-management system. Such a demonstration would indicate that JHE, as a novel anti-JH agent, may be potentially useful for insect control and may represent a major step toward a more sustainable agriculture. Source


Munirathnam K.,Sri Venkateswara University | Dillip G.R.,Yeungnam University | Chaurasia S.,Bhabha Atomic Research Center | Joo S.W.,Yeungnam University | And 2 more authors.
Journal of Molecular Structure | Year: 2016

Near white-light emitting LiNa3P2O7:Dy3+ phosphors were prepared by a conventional solid-state reaction method. The orthorhombic crystal structure of the phosphors was confirmed using X-ray diffraction (XRD), and the valence states of the surface elements were determined from the binding energies of Li 1s, O 1s, Na 1s, P 2p, and Dy 3d by X-ray photoelectron spectroscopy (XPS). Attenuated total reflectance (ATR) - Fourier transform infrared (FT-IR) spectroscopy was employed to identify the pyrophosphate groups in the phosphors. Diffuse reflectance spectra (DRS) show the absorption bands of the Dy3+ ions in the host material. Intense blue (481 nm) and yellow (575 nm) emissions were obtained at an excitation wavelength of 351 nm and are attributed to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+ ions, respectively. The combination of these two intense bands generates light emission in the near-white region of the chromaticity diagram. © 2016 Elsevier B.V. All rights reserved. Source


Sai L.V.,Sri Padmavathi Womens University | Anuradha P.,Sri Padmavathi Womens University | Vijayalakshmi K.,Sri Padmavathi Womens University | Reddy N.P.E.,Sri Padmavathi Womens University
Journal of Pure and Applied Microbiology | Year: 2010

Groundnut is an important oil seed crop of tropics and sub-tropical regions of the world. Among the fungal diseases, Stem rot of groundnut caused by Sclerotium rolfsii is potentially very destructive disease. A detailed study on isolation of pathogen, rhizosphere mycoflora, antagonism of rhizosphere against S.rolfsii and integrated management of the disease with biocontrol agent. Eight different mycoflora were Aspergillus flavus, Bhizopus sp., Pencillium, A.niger and Trichoderma isolates (TG1, TG2, TG3 TG4) isolated consistently from the rhizosphere of groundnut. Among them TG2 isolate was found to be significantly superior over others in inhibiting the mycelial growth of S.rolfsii to the extent of 67.83%. Source

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