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( A. R. Pradeep ),( V. S. K. Nair ) 한국잠사학회 2005 International Journal of Industrial Entomology Vol.10 No.2
Though many insecticides are commercially available, development of resistance, pest resurgence and effects on non-target organisms led to the search for alternate insect pest management (IPM) strategy based on larval growth and reproductive fitness. Reproductive potential of insects depends on its acquiring of vitellogenic competence which is under hormonal control. Exogenous application of analogues of JR (JHAs) and ecdysterone could derail normal development and reproduction in insects by manipulating an array of physiological processes. In the rice pest, brown plan-thopper, Nilaparvata lugens, JHA, hydroprene induced metathetely from the fifth (final) instar nymphs in an age-dependent manner. Day 0 of the final instar showed highest sensitivity to induce this abnormal development. Adults emerged from treated day 3 nymphs looked normal. Both the morphotypes were reproductively incompetent and showed partial to complete sterility. Pre-adult exposure of the ovarian tissue to hydroprene suppressed mitotic division of germinal cells and induced abnormalities in the later stages of growth and differentiation of ovary in N. lugens. More over the nymphal exposure to hydroprene inhibited patency changes of follicular epithelium and affected competence of the follicles for yolk sequestration. In the absence of ovarian growth and oocyte differentiation, germarium found disintegrated, trophic core regressed and terminal oocytes resorbed. Hydroprene exposure to newly ecdysed brachypterous females did not affect ovarian development and egg production. Proper larval-adult transition appeared as a. prerequisite for vitellogenic competence in N. lugens for which the ovarian tissues must be exposed to ecdysterone in the internal milieu devoid of JH.
Pradeep A. R.,Nair V. S. K. Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.10 No.2
Though many insecticides are commercially available, development of resistance, pest resurgence and effects on non-target organisms led to the search for alternate insect pest management (IPM) strategy based on larval growth and reproductive fitness. Reproductive potential of insects depends on its acquiring of vitellogenic competence which is under hormonal control. Exogenous application of analogues of JR (JHAs) and ecdysterone could derail normal development and reproduction in insects by manipulating an array of physiological processes. In the rice pest, brown planthopper, Nilaparvata lugens, JHA, hydroprene induced metathetely from the fifth (final) instar nymphs in an age-dependent manner. Day 0 of the final instar showed highest sensitivity to induce this abnormal development. Adults emerged from treated day 3 nymphs looked normal. Both the morphotypes were reproductively incompetent and showed partial to complete sterility. Pre-adult exposure of the ovarian tissue to hydroprene suppressed mitotic division of germinal cells and induced abnormalities in the later s1ages of growth and differentiation of ovary in N. lugens. More over the nymphal exposure to hydroprene inhibited patency changes of follicular epithelium and affected competence of the follicles for yolk sequestration. In the absence of ovarian growth and oocyte differentiation, germarium found disintegrated, trophic core regressed and terminal oocytes resorbed. Hydroprene exposure to newly ecdysed brachypterous females did not affect ovarian development and egg production. Proper larval-adult transition appeared as a. prerequisite for vitellogenic competence in N. lugens for which the ovarian tissues must be exposed to ecdysterone in the internal milieu devoid of JH.
Morsdorf, L.,Pradeep, K. G.,Herzer, G.,Ková,cs, A.,Dunin-Borkowski, R. E.,Povstugar, I.,Konygin, G.,Choi, P.,Raabe, D. American Institute of Physics 2016 JOURNAL OF APPLIED PHYSICS - Vol.119 No.12
<P>Nucleation of soft magnetic Fe3Si nanocrystals in Cu-free Fe74.5Si15.5Nb3B7 alloy, upon rapid (10 s) and conventional (30 min) annealing, was investigated using x-ray diffraction, transmission electron microscopy, Mossbauer spectroscopy, and atom probe tomography. By employing rapid annealing, preferential nucleation of Fe3Si nanocrystals was achieved, whereas otherwise there is simultaneous nucleation of both Fe3Si and undesired Fe-B compound phases. Analysis revealed that the enhanced Nb diffusivity, achieved during rapid annealing, facilitates homogeneous nucleation of Fe3Si nanocrystals while shifting the secondary Fe-B crystallization to higher temperatures resulting in pure soft magnetic nanocrystallization with very low coercivities of similar to 10 A/m. (C) 2016 AIP Publishing LLC.</P>
Wound Healing Activity of the Chloroform Extract of Plumbago rosea Linn. and Plumbagin
A. Saraswathy,R.V. Pradeep Chandran,B. Murali Manohar,S.Vairamuthu 한국생약학회 2006 Natural Product Sciences Vol.12 No.1
wound healing activity of plumbagin and the chloroform extract of Plumbago rosea Linn. (Yoot),incorporated into ointments with yellow soft paraffin, have been investigated on rats. Wound healing activity wasstudied using excision and incision wound models in rats following topical application. Both plumbagin and thePlumbago rosea root extract produced a significant response in both of the wound models studied. The woundPlumbago rosea root extract (0.5%),as against in 22 days in the case of control animals. The results were also comparable to those of a standard drug,framycetin sulphate cream (1% w/w) in terms of wound contracting ability, wound closure time, tensile strengthof wound and regeneration of tissues at the wound site. Histological studies revealed evidences for the healingprocess by formation of fibrovascular tissue, epithelization and increased collagenization when compared tocontrol.Keywordswound healing activity, Plumbago rosea, plumbagin, Plumbaginaceae
Advances in gamma radiation detection systems for emergency radiation monitoring
K.A. Pradeep Kumar,G.A. Shanmugha Sundaram,B.K. Sharma,S. Venkatesh,R. Thiruvengadathan 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.10
The study presents a review of research advancements in the field of gamma radiation detection systems for emergency radiation monitoring, particularly two major sub-systems namely (i) the radiation detector and (ii) the detection platform – air-borne and ground-based. The dynamics and functional characteristics of modern radiation detector active materials are summarized and discussed. The capabilities of both ground-based and aerial vehicle platforms employed in gamma radiation monitoring are deliberated in depth.
Torque Ripples Minimization of DTC IPMSM Drive for the EV Propulsion System using a Neural Network
Bhim Singh,Pradeep Jain,A.P.Mittal,J.R.P.Gupta 전력전자학회 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.1
This paper deals with a Direct Torque Control (DTC) of an Interior Permanent Magnet Synchronous Motor (IPMSM) for the Electric Vehicle (EV) propulsion system using a Neural Network (NN). The Conventional DTC with optimized switching lookup table and three level torque controller generates relatively large torque ripples in an electric vehicle motor drive. For reducing the torque ripples, a three level torque controller is hereby replaced by the five level torque controller. Furthermore, the switching lookup table of the five level torque controller based DTC is replaced with a Neural Network. These DTC schemes of an IPMSM drive are simulated using MATLAB/SIMULINK. The simulated results are compared with the conventional DTC and it is found that the ripples in the torque, as well as in the stator current, are reduced drastically.
Torque Ripples Minimization of DTC IPMSM Drive for the EV Propulsion System using a Neural Network
Singh, Bhim,Jain, Pradeep,Mittal, A.P.,Gupta, J.R.P. The Korean Institute of Power Electronics 2008 JOURNAL OF POWER ELECTRONICS Vol.8 No.1
This paper deals with a Direct Torque Control (DTC) of an Interior Permanent Magnet Synchronous Motor (IPMSM) for the Electric Vehicle (EV) propulsion system using a Neural Network (NN). The Conventional DTC with optimized switching lookup table and three level torque controller generates relatively large torque ripples in an electric vehicle motor drive. For reducing the torque ripples, a three level torque controller is hereby replaced by the five level torque controller. Furthermore, the switching lookup table of the five level torque controller based DTC is replaced with a Neural Network. These DTC schemes of an IPMSM drive are simulated using MATLAB/SIMULINK. The simulated results are compared with the conventional DTC and it is found that the ripples in the torque, as well as in the stator current, are reduced drastically.
Toxicity Studies on Peristrophe paniculata (Forssk) Brummitt-an Ayurveda Drug.
R.V. Pradeep Chandran,A. Saraswathy,B. Murali Manohar,S. Vairamuthu 한국생약학회 2008 Natural Product Sciences Vol.14 No.2
Chronic oral toxicity studies (90 days) on aqueous and methanol extracts of the whole plant of Peristrophe paniculata (Forssk) Brummitt were carried out in Wistar rats. The dosage was 200 mg/kg/day, p.o. for both the extracts. All external morphological and biochemical changes, in addition to body weight and vital organ weights were recorded. During this investigation, no significant mortality was observed. The results showed that both the extracts were devoid of any toxicity at the dose level studied as compared to the control group.